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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korea Academia-Industrial cooperation Society
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Journal DOI :
The Korea Academia-Industrial cooperation Society
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Volume & Issues
Volume 13, Issue 12 - Dec 2012
Volume 13, Issue 11 - Nov 2012
Volume 13, Issue 10 - Oct 2012
Volume 13, Issue 9 - Sep 2012
Volume 13, Issue 8 - Aug 2012
Volume 13, Issue 7 - Jul 2012
Volume 13, Issue 6 - Jun 2012
Volume 13, Issue 5 - May 2012
Volume 13, Issue 4 - Apr 2012
Volume 13, Issue 3 - Mar 2012
Volume 13, Issue 2 - Feb 2012
Volume 13, Issue 1 - Jan 2012
Selecting the target year
A Study on the Heating and Cooling Energy Load Analysis of the KNU Plant Factory
Lee, Chan-Kyu ; Kim, Woo-Tae ;
Journal of the Korea Academia-Industrial cooperation Society, volume 13, issue 4, 2012, Pages 1419~1426
DOI : 10.5762/KAIS.2012.13.4.1419
The heating and cooling energy load of the KNU plant factory was analyzed using the DesignBuilder. Indoor temperature set-point, LED supplemental lighting schedule, LED heat gain, and type of double skin window were selected as simulation parameters. For the cases without LED supplemental lighting, the proper growth temperature of lettuce
was selected as indoor temperature set-point together with
. The annual heating and cooling loads which are required to maintain a constant indoor temperature were calculated for all the given temperatures. The cooling load was highest for
and heating load was highest for
. For the cases with LED supplemental lighting, the heating load was decreased and the cooling load was 6 times higher than the case without LED. In addition, night time lighting schedule gave better result as compared to day time lighting schedule. To investigate the effect of window type on annual energy load, 5 different double skin window types were selected. As the U-value of double skin window decreases, the heating load decreases and the cooling load increases. To optimize the total energy consumption in the plant factory, it is required to set a proper indoor temperature for the selected plantation crop, to select a suitable window type depending on LED heat gain, and to apply passive and active energy saving technology.
Prediction on Performance of Cascade Refrigeration System using Alternative Freon and Natural Refrigerants
Kim, Jong-Ryeol ; Roh, Geon-Sang ;
Journal of the Korea Academia-Industrial cooperation Society, volume 13, issue 4, 2012, Pages 1427~1433
DOI : 10.5762/KAIS.2012.13.4.1427
In this paper, cycle performance analysis of cascade refrigeration system using alternative FREON refrigerants and natural refrigerants are presented to offer the basic design data for the operating parameters of the system. The operating parameters considered in this study include subcooled and superheated degree, and condensing and evaporating temperature, temperature difference of cascade heat exchanger in cascade refrigeration system. The COP of cascade refrigeration system increases with the increasing subcooled degree, but there is no significant changes with the increasing superheated degree. The COP of cascade refrigeration system depends on evaporating and condensing temperatures of cascade heat exchanger. Therefore, subcooled degree, evaporating and condensing temperature of cascade heat exchanger using alternative FREON refrigerants and natural refrigerants have an effect on the COP of this system. In this paper, COP of cascade refrigeration system using (R23 / R290), (R23 / R600), (R23 / R600a), (R23 / R717), (R744 / R404A) are higher 20 ~ 36 % than (R23 / R22), using R23 for low temperature system and R22 for high temperature system.
Application of Sensitivity Analysis to Vehicle Handling with Equivalent Cornering Stiffness
Lee, Chang-Ro ;
Journal of the Korea Academia-Industrial cooperation Society, volume 13, issue 4, 2012, Pages 1434~1439
DOI : 10.5762/KAIS.2012.13.4.1434
Vehicle is a dynamic system combined with various parameters. Dynamic characteristics of a vehicle can vary with the change of these parameters. To investigate the effect of the design parameter on vehicle handling performance the sensitivity analysis is carried out by the numerical method. The vehicle model is described by equivalent cornering stiffness that considers parameters of suspension and steering system. As the analysis results show the effect on the static and dynamic characteristics of the vehicle system, the sensitivity analysis can be used for synthesis of the design parameters to improve the vehicle handling characteristics at the design stage as well as during the vehicle test under development.
Effect of the lubrication oil on heat transfer and pressure drop characteristics of supercritical carbon dioxide in a microfin tube
Ku, Hak-Keun ;
Journal of the Korea Academia-Industrial cooperation Society, volume 13, issue 4, 2012, Pages 1440~1446
DOI : 10.5762/KAIS.2012.13.4.1440
This paper presents an experimental study of heat transfer and pressure drop characteristics of supercritical carbon dioxide with PAG inside a horizontal microfin tube. Heat transfer coefficient and pressure drop gradients were measured at 10 MPa in pressure and 520 kg/
in mass flux with variation of PAG mass concentration from 0.06% to 2.26%. The tendencies of both heat transfer and frictional pressure drop characteristics show the same as those of pure
up to 0.3% in PAG mass concentration. In case of 2.26% in PAG mass concentration, measured heat transfer coefficients showed 50% lower than those of pure
near the pseudocritical temperature and measured frictional pressure drop gradients show 1.6 times higher in comparison with those of pure
Structural Analysis of Hydraulic Valve Meter
Lee, Jong-Sun ;
Journal of the Korea Academia-Industrial cooperation Society, volume 13, issue 4, 2012, Pages 1447~1452
DOI : 10.5762/KAIS.2012.13.4.1447
Existing hydraulic valve meter used in industrial fields precise pressure measurement gives inconvenience in precise measurement due to manually regulated pressures. In order to improve this inconvenience, the hydraulic valve meter was designed by using automatic design program CATIA and structural analysis of the designed hydraulic valve meter was conducted and internal water leaking, stress, strain and total deformation were obtained by applying three dimensional finite element code ANSYS. These results will be provided to develop new concepts of hydraulic valve meters as fundamental data.
Bond Graph Modeling, Analysis and Control of Dual Stage System
Wang, Wei-Jun ; Han, Chang-Soo ;
Journal of the Korea Academia-Industrial cooperation Society, volume 13, issue 4, 2012, Pages 1453~1459
DOI : 10.5762/KAIS.2012.13.4.1453
The dual stage manipulator is composed of the voice coil motor (VCM) and piezoelectric ceramics transducer (PZT), which can produce the high precise displacement and express a well dynamic performance. However, inaccurate modeling of the dual stage will exacerbate the positioning accuracy. This paper presents an approach to model the dual stage system by using bond graph theory. And the state space equations can be derived through the bond graph straightforwardly, which can be used in computing simulations. Through designing the compensators for the dual stage system and simulating, the dual stage performs better dynamics characteristic than the single actuator system.
Development of Semi-automatic Gas Metal Arc Welding Equipment for Fire Piping and Evaluation of Characteristics of Weld Joints
Lim, Young-Min ; Oh, Tae-Suk ; Jo, Hyun ; Koh, Jin-Hyun ;
Journal of the Korea Academia-Industrial cooperation Society, volume 13, issue 4, 2012, Pages 1460~1465
DOI : 10.5762/KAIS.2012.13.4.1460
The semi-automatic gas metal arc welding equipment was developed and the weldability of zinc coated steel pipes was evaluated in terms of strength, porosity and welding parameters including shielding gas composition. The good bead appearance and the reduction of porosity in the welds could be possibly obtained by adding
to Ar. The strength and joint efficiency of welds made by the semi-automatic welding equipment was about 1.8 times higher compared with welds manually made. The integrity of welds was confirmed by the water pressure test as well, Finally, it is expected that the weld productivity will be enhanced even unskilled welders can produce quality welds by operating the semi-automatic welding equipment.
Heat Transfer Characteristics in the Evaporator of a Soft Ice Cream Maker
Byun, Ho-Won ; Lee, Jin-Wook ; Kim, Nae-Hyun ;
Journal of the Korea Academia-Industrial cooperation Society, volume 13, issue 4, 2012, Pages 1466~1473
DOI : 10.5762/KAIS.2012.13.4.1466
Soft icecream is made by scraping an ice formed on the inside of the cylindrical evaporator, where R-404A is evaporating in the annulus. The heat transfer characteristics of the refrigerant evaporation and those during icecream formation were experimentally investigated. Results show that the refrigerant-side heat transfer coefficients are highly dependent on the location in the evaporator due to the complex annulus configuration. The heat transfer coefficient at the inlet is generally lower than those of other locations. The average heat transfer coefficient increases as heat flux increases or saturation temperature decreases. A correlation is developed to predict the refrigerant-side heat transfer coefficient. The icecream-side heat transfer coefficient oscillates continuously due to the periodic removal of ice formed on the surface. The average heat transfer coefficient during icecream formation is approximately 280 W/
, and that during single-phase cooling increased from 150 W/
to 250 W/
Development of the Rotational Smart Lighting Control System Using Artificial Light for Plant Factory
Lee, Won-Sub ; Kim, Sung-Gaun ;
Journal of the Korea Academia-Industrial cooperation Society, volume 13, issue 4, 2012, Pages 1474~1479
DOI : 10.5762/KAIS.2012.13.4.1474
Rotational smart lighting control system provides artificial light to plants on planting board by rotational lighting system. As the lighting system of existing plant factory has high cost problem due to the installation for many lighting equipments, the lighting system was developed to rotate less number of lighting equipments to reduce cost. In this paper, the illuminance, luminous flux and photosynthetic photon flux density(PPFD) that plants need to grow were calculated. And the light intensity at each measured location considering the rotational speed of blade were analyzed by the simulation and the experiment.
Failure Load Prediction of Tunnel Support using DOE and Optimization Algorithm
Lee, Dong-Woo ; Cho, Seok-Swoo ;
Journal of the Korea Academia-Industrial cooperation Society, volume 13, issue 4, 2012, Pages 1480~1487
DOI : 10.5762/KAIS.2012.13.4.1480
Recently, the safety of the coal-mining tunnels has been improved greatly, but accidents occur continually. Most tunnel support failures occur because the fish plate part that connects the I-beams is unable to withstand ground pressure. In the case of XX coal mine, the arch part of tunnel support bends to the upper direction. In such a case, excessive horizontal load as well as vertical load acts on the tunnel support. Horizontal load is caused by the sudden loosing of underground rock mass or the leakage of underground water, so it is fairly complex to predict horizontal loading on a tunnel support. To predict the horizontal load on this component is defined as the problem that determines the horizontal load conditions in wedges of tunnel support. This is an optimization problem in which maximum bending stress and horizontal load are considered by an objective function and design variables, respectively. Therefore, in this study, design of experiments and optimization algorithm were applied to identify the horizontal load in tunnel support.
Study on Structural Analysis of DCB Specimen Bonded with Aluminum Foam Composite
Choi, Hae-Kyu ; Kim, Sei-Hwan ; Cho, Jae-Ung ;
Journal of the Korea Academia-Industrial cooperation Society, volume 13, issue 4, 2012, Pages 1488~1495
DOI : 10.5762/KAIS.2012.13.4.1488
In this study, the fracture behaviour of DCB(double cantilever beam) specimen with aluminum foam composite materials is analyzed by simulation. The used model is 3D configuration on the basis of British industrial standard and ISO international standard. As the thickness of model is increased, the length of propagated crack is increased and the load becomes higher. The analysis result obtained by this study can be applied at the practical composite structure bonded with aluminum foam materials. The fracture behaviour is analyzed and the mechanical property can be understood.
A Study on Flow and Vibration Analysis, and Performance Test for Automotive Fuel Pump
Son, Jae-Hwan ; Bae, Jung-Sub ; Kim, Young-Suk ; Han, Chang-Woo ;
Journal of the Korea Academia-Industrial cooperation Society, volume 13, issue 4, 2012, Pages 1496~1502
DOI : 10.5762/KAIS.2012.13.4.1496
The fuel pump mounted on the engine in the vehicle is consist of the outer and inter rotors, and which inhales fuel from the inlet port and supplies it to the outlet port. In this study, it is carried out the analysis and test of the fuel pump with rotors to evaluate its performance. It is analyzed the flow characteristics of the fuel pumps with numerical simulation in their inlet-outlet angles of 0, 15, 30 degree. After it is determined whether it has the best flow characteristics, its vibration characteristics is analyzed. The flow rate of a pump in the inlet-outlet angles of 0 degree is 191.0 LPH(Liter per hour) which is the largest. and its vibration is calculated to be 0.866
. In the results of vibration test, it is known that the vibration of the research pump is smaller than that of the existing one. And the natural frequencies of two pumps is nearly same. Therefore it is known that the performance of the research pump is superior.
Heat and Flow Analysis in the HVAC Impeller for Mid-Size Car
Lee, Dong-Ryul ;
Journal of the Korea Academia-Industrial cooperation Society, volume 13, issue 4, 2012, Pages 1503~1510
DOI : 10.5762/KAIS.2012.13.4.1503
In this research, various cases of centrifugal impeller for HVAC system have been numerically analyzed by changing center angle of blades and length of outlet. Commercial CFD code, FLUENT has been used to calculate velocity, pressure, turbulence intensity, and temperature that can lead numerous results. Regardless of warming up, when the heater power level was increased, the temperature inside surrounding impeller also increased due to flowing outer air, but the temperature decreased because of flowing inner air. Consequently, the variation of central angle of blades and length of outlet led difference of velocity and flow rate which can reduce
in gas emission.
A Study on Cooling of Piezoelectric Element of Multifunction Equipment for Vacuum Exhaust and Ultrasonic Joining
Park, Sang-Jun ; Lee, Young-Lim ;
Journal of the Korea Academia-Industrial cooperation Society, volume 13, issue 4, 2012, Pages 1511~1517
DOI : 10.5762/KAIS.2012.13.4.1511
Vacuum chamber or vacuum tube for the exhaust process of vacuum glazing is presently used, where excessive time and expenses are required to make the whole vacuum chamber or tube vacuum. To solve this problem, multifunction equipment for vacuum exhaust and ultrasonic joining at atmospheric pressure has been developed, in which a piezoelectric vibrator experiences excessive temperature rise resulting in optimizing the cooling of the equipment. Therefore, in this study, cooling effects of natural convection and forced convection methods were identified by numerical analysis and experiments, and cooling performance of the multifunction equipment was optimized.
A Study on Campaign Strategy of Brand Revitalization in Maturity Stage -focused on BEKSUL-
Ahn, Hye-Shin ;
Journal of the Korea Academia-Industrial cooperation Society, volume 13, issue 4, 2012, Pages 1518~1524
DOI : 10.5762/KAIS.2012.13.4.1518
A Brand is supposed to age as it goes by, following a brand life cycle, as it is not a solid, immutable asset but something of a living creature. Therefore, self-renovation and revitalization efforts are needed, in order to incessantly confirm the self existence through the relationship with the consumer. In 2009 and 2011, 'Beksul', brand in maturity stage tried to revitalize Brand and the brand image two-times. For this study, brand logo and TV commercials of Beksul for revitalization were gathered via TVCF.com and their creative strategy were studied. This study could find that the creative strategy of brand in maturity stage is based on its brand essence and focused on reinforcing brand royalty.
A Study on Development of Smartphone Mobile Application for Word-of-Mouth Marketing in Low-Budget Independent Film
Kim, Hye-Won ;
Journal of the Korea Academia-Industrial cooperation Society, volume 13, issue 4, 2012, Pages 1525~1531
DOI : 10.5762/KAIS.2012.13.4.1525
This study has been developed to make a marketing tool for word-of-mouth marketing for "Low-Budget Movie". By developing an application program of Low-Budget Movie for 20millions of Smart-Phone user, it can find out the best environment of service, function, etc. Hereby, it could contribute the progress of Korean film industry with this marketing tool of Low-Budget movie. For the research, conjoint analysis has been done through conjoint survey and general survey.
A Study on the Development of Brand Programs for Regional Culture & Art Centers
Park, Jin-Young ;
Journal of the Korea Academia-Industrial cooperation Society, volume 13, issue 4, 2012, Pages 1532~1540
DOI : 10.5762/KAIS.2012.13.4.1532
The development and operation of brand programs can help regional Culture & Art Centers provide sustainable contents to local citizens. The study of domestic and foreign examples shows that successful, competitive brand programs share common characteristics: interactive features; systematization and manualization of programs and unique, individual, universal themes.
The Study on Entrepreneurial Motivations and Maintenance Factors of Independent Publication
Cho, Jung-Mi ; Kong, Byoung-Hun ;
Journal of the Korea Academia-Industrial cooperation Society, volume 13, issue 4, 2012, Pages 1541~1550
DOI : 10.5762/KAIS.2012.13.4.1541
The study examines entrepreneurial motivation and maintenance factors of independent publication, a rising business in the current digital era. Focusing on a case of independent publication which has been successful, this research discloses that personal attributes and backgrounds of individuals are the main factors to motivate them to establish businesses. Personal attributes include desire for achievement, self-control, risk-taking inclination, and etc., and personal backgrounds contain educational background, work experiences in the same line of business, social network, and etc. Moreover, this research also discovers that both intrinsic reward indicating the belief that the individuals will be able to publish the books which they want, and extrinsic reward as market profits are the main maintenance factors. This case study will contribute to developing the education and consulting programs for independent publication entrepreneurship and the related policies.
An Efficient Portfolio Selection Methodology using DEA Approach
Son, Min ; Shin, Hyun-Joon ;
Journal of the Korea Academia-Industrial cooperation Society, volume 13, issue 4, 2012, Pages 1551~1556
DOI : 10.5762/KAIS.2012.13.4.1551
This study proposes an efficient portfolio selection methodology for the listed corporations in KOSPI with consideration of managerial efficiency. For each industrial sector classified by KRX(Korea Exchange), the proposed method carries out an efficiency analysis using DEA (Data envelopment analysis) approach and for the efficient corporations filtered by DEA, construct portfolio using Markowitz's Model. In order to show the effectiveness of the proposed method, we constructed annually portfolios for 4 years (2007-2010) out of 600 listed corporations in KOSPI and KOSDAQ, and proved that our portfolios are superior to benchmark portfolios in terms of rate of returns.
A Study on the Relationship Between Appropriateness of Education/Training for IT Professionals and Organizational Commitment: Moderating Effects of Top Talents Management and Organizational Trust
Han, Soo-Jin ; Kim, Yoo-Jung ; Kang, So-Ra ;
Journal of the Korea Academia-Industrial cooperation Society, volume 13, issue 4, 2012, Pages 1557~1565
DOI : 10.5762/KAIS.2012.13.4.1557
The professional workers with a sophisticated knowledge, skill and ability are core human resources to sustain firm's competitiveness. It is very crucial to provide professional workers with an appropriate education and training to get them have organizational commitment. Thus, this study examines the relationship between appropriateness of education/training for IT professionals and organizational commitment, and explores the moderating effects that top talent management and trust have on the association between appropriateness of education/training (AET) and organizational commitment (OC). The 379 responses from firm panel survey of human capitals, which was conducted by KRIVET on 2009, were used to assess construct validity and research hypotheses. The findings show that appropriateness of education/training has a positive impact on organizational commitment. It is also found that respecting top talent has a moderating effect on the AET-OC relationship whereas trust doesn't moderate the AET-OC relationship.
A Study on Pre-parents' Perception of Parental Role and View of Children
Lee, Eun-Jeong ; Kang, Yung-Sik ; Park, Jung-Hwan ;
Journal of the Korea Academia-Industrial cooperation Society, volume 13, issue 4, 2012, Pages 1566~1573
DOI : 10.5762/KAIS.2012.13.4.1566
In this study, a survey was carried out on 200 23-year old unmarried men and women attending j university in j city from October 4 to October 7, 2011 to figure out pre-parents' perception of parental role and view of children, and put forward the necessity of pre-parent education by providing opportunities for pre-parent education. The results are summarized as follows. First, the perception of general parenting and parental role showed that 'parenting' is the highest, following by 'parental role'. For women, nuclear families and large families, who feel much necessity of pre-parent education in the academic liberal arts, the perception of general parenting, parental role and parenting by sub-factors was positive. Second, the perception of general view of children showed that 'children plan' is the highest, followed by 'pregnancy and birth.' For those surveyed, who have a plan for marriage and children plan or feel much necessity of pre-parent education in the academic liberal arts, the perception of general view of children, children plan by sub-factors, and pregnancy and birth was relatively positive. As for findings stated above, for pre-parents in their 20s~30s, women' perception of parental role and view of children was more positive than men'. And nuclear families' or large families' perception was more positive than single parent families'. These findings confirm there is a difference between parental role and view of children according to growth environments of pre-parents in social realities that the low birth rate is growing.
An Exploratory Study on Consumers' Design Sensitivity of Luxury Brand Products and non-Luxury Brand Products and Its Effect on Purchase Intention
Bang, Joung-Hae ; Kim, Min-Sun ;
Journal of the Korea Academia-Industrial cooperation Society, volume 13, issue 4, 2012, Pages 1574~1584
DOI : 10.5762/KAIS.2012.13.4.1574
This study attempts to explore the design sensitivity of both luxury and non-luxury brand products, and its effect on purchase intention. As a result, there was no difference in design sensitivity between luxury and non-luxury brand product, but the effect of design sensitivity on purchase intention was found different between luxury and non-luxury brand. It shows that for luxury brand, the people with high design pursuit of the brand have high purchase intention while for non-luxury brand, the people with high design value of the brand have high purchase intention. It indicates that for luxury brands, consumers already recognize the value of its design, which does not affect the purchase intention. For non-luxury brands, it would be important to let consumers recognize their design value.
The Effect of Career Self-efficacy on the Course of Retirement for Baby Boomer Generation
Kim, Ki-Seung ; Yun, Sung-Won ;
Journal of the Korea Academia-Industrial cooperation Society, volume 13, issue 4, 2012, Pages 1585~1593
DOI : 10.5762/KAIS.2012.13.4.1585
Year 2010 was the first year in which the baby boomer generation began to regularly retire by the corporate retirement system. For the following 10 years from then, large scale retirement of the baby boomer generation that used to be the driving force of economic growth in Korean society is expected to cause various social problems such as reduction in labor force and economic loss from transfer to welfare subjects. In relation to reemployment of the baby boomer generation after retirement, this study was attempted first, for analysis on the difference in the course of retirement according to average monthly income and current occupation and second, with an assumption that career self efficacy will influence the course of retirement. Total of 500 surveys for this study were distributed to baby boomer generations through direct visit or mail post in Seoul, Gyeonggi, Gangwon, Chungnam, Gyeongnam, Jeonnam and Jeju for one month during January 17 and February 16, 2012. 443 surveys were returned, among which 400 effective responses were selected as study subjects. As a result, the course of retirement according to average monthly income was verified to be significant for all factors. Significant results were found for the course of retirement according to current occupation in job transfer, complete non-employment and repetitive non-employment. In relation to the effect of career self efficacy on the course of retirement, job movement factor was affected by 21%. This study will be a good guide for the establishment of a social policy and retirement life preparation of the baby boomer generation.
A Study on the Governmental Policy' Loan of Small Business
Kim, Soon-Tae ; Min, Kyung-Myung ; Oh, Sang-Young ;
Journal of the Korea Academia-Industrial cooperation Society, volume 13, issue 4, 2012, Pages 1594~1602
DOI : 10.5762/KAIS.2012.13.4.1594
This study has focused on analyzing the changes of increasing sales and potential growth by different scales of support with funds through effect analysis on governmental policy loan. It provided significant findings for the further governmental policy loan since it conducted the performance analysis of different business respectively, which included business with the governmental policy loan and ones without any loan.
Measuring Unemployment Durations of Different Types of Workers
Choi, Chang-Kon ;
Journal of the Korea Academia-Industrial cooperation Society, volume 13, issue 4, 2012, Pages 1603~1608
DOI : 10.5762/KAIS.2012.13.4.1603
This paper aims to build a model of unemployment duration, in which each type of unemployment duration can be defined as a function of other exogenous variables. Recently, the so-called mismatch in the labor market has become a big issue in most countries. It is very obvious that 'mismatch' is deeply related to the long duration of unemployment status. Two problems may be head and tail of the same coin. Employing a simple analysis of Markov stochastic process, the model of unemployment duration developed here is useful for seeing the effects of shocks on unemployment duration. The model allows us to distinguish the determinants of different kinds of unemployment and to identify the nature of unemployment duration.
e-Service Quality and Behavioral Intention in the App Shopping Mall
Chun, Joo-Hyung ; Lim, Yeon-Woo ;
Journal of the Korea Academia-Industrial cooperation Society, volume 13, issue 4, 2012, Pages 1609~1618
DOI : 10.5762/KAIS.2012.13.4.1609
We can easily acknowledge the facts that the e-market is increasingly and quickly changed by the smart phone user's. This research focuses the e-service quality and relationship between the e-service quality, customer satisfaction and behavioral intention in the AppShopping Mall. Based on the documentary research, the empirical study was followed by the questionnaire. The 313 usable questionnaires were collected by a self-administered survey. The results reveal that the e-service quality determinants are factors including customer service, app design, security, connectivity and user's convenience, and that the e-service quality is directly or indirectly related to customer satisfaction and behavioral intention. The AppShopping mall managers have to try on their best to find out the customer's needs, manage the lists of the e-service quality and develop the app.
A Study on the Effects of Acculturative Stress Factors to Mental Health of Married Immigrant Women
Lee, Eun-Hee ; Chu, Youn-Sik ;
Journal of the Korea Academia-Industrial cooperation Society, volume 13, issue 4, 2012, Pages 1619~1624
DOI : 10.5762/KAIS.2012.13.4.1619
The purpose of this study is to examine the mental health of married immigrant women and the effect of cultural adaptation stress of married immigrant women on mental health. The subjects were 239 married immigrant women who live in Pusan city. Collected date were analyzed through frequency, percentage, and stepwise multiple regression analysis. The results are as follows. The 17.6% of the sample had the problem of mental health. The result of stepwise multiple regression analysis indicated that factors which predict the level of married immigrant women's mental health were cultural shock, fear, and guilty feeling. The findings give us significant practical implications for social work intervention.
A Study on the Wealth of Seller and Buyer in Asset Sales
Lee, Sang-Lae ; Oh, Hyun-Tak ;
Journal of the Korea Academia-Industrial cooperation Society, volume 13, issue 4, 2012, Pages 1625~1632
DOI : 10.5762/KAIS.2012.13.4.1625
The purpose of this study is to analyze whether asset sales contributed to increase of the shareholder value of the seller and the buyer in Japan. The period of analysis is 2000-2007. As a result of event study, Although the stockholder of the seller earn positive abnormal returns at the announcement of a asset sales, most stockholders of the buyer were break even. However, the buyer which purchase related asset get positive abnormal returns. Furthermore, when using a matched seller-buyer, we find that asset sales are firm value enhancing for the seller and buyer. Furthermore, we verify whether the excess return depends on the financial condition, and the managerial performance. we find that seller gains are related to the seller's managerial performance, leverage ratio, and buyer gains are related to the leverage ratio, foreigner holdings ratio. we conclude that lender and outside monitoring lead to increase of firm value.
A Study on the impact Career Maturity of Vocational Education Training
Park, Jai-Hak ; Kang, Byung-Jin ; Lim, Sang-Ho ;
Journal of the Korea Academia-Industrial cooperation Society, volume 13, issue 4, 2012, Pages 1633~1639
DOI : 10.5762/KAIS.2012.13.4.1633
In this paper, in Incheon, vocational education and training satisfaction of vocational training institutions and on the factors affecting the career maturity were investigated. Mercy Vocational trainees receive training in vocational education and training to improve skills in the process it was found that commitment. In addition, "friends, family, acquaintances," with the encouragement of vocational education and training has been to collect. Prefer long-term training and career maturity and high educated singles with lower career maturity were higher. Regression analysis of satisfaction in the vocational education and training information, influence on career maturity. Therefore, the authorities concerned in the vocational education and training program faithfully find ways to operate should be.
The Effect of Allocation to Third Parties in Increase of Capital on Stock Price of KOSDAQ Firms
Cho, Sang-Kwon ; Kang, Ho-Jung ;
Journal of the Korea Academia-Industrial cooperation Society, volume 13, issue 4, 2012, Pages 1640~1647
DOI : 10.5762/KAIS.2012.13.4.1640
The allocation to third parties in increase of capital is increasing in KOSDAQ firms. With this trend, they cause many problems which involves stock price manipulation. Under this condition, this study analyzes stock price reaction by event study to 197 cases of 81 KOSDAQ companies that allocated to third parties in increase of capital between the year of 2007 and 2009. And we find determinants of cumulative abnormal return by using multiple regression. Results of this research are as follows. First, in case of excess return of (-5, +5), it reveals positive excess return significantly at 1% significance level during 4 days before payment day(event day). But it reveals negative excess return significantly at 1% significance level during 5 days after payment day. Second, in case of excess return of (-40, +40), it reveals positive excess return significantly at 1% significance level during 40 days before payment day(event day). But it reveals negative excess return significantly at 1% significance level during 40 days after payment day. Third, in case of excess return of (0, 1 year), it reveals negative excess return significantly at 1% significance level during 1 year after payment day. Fourth, significant determinant of cumulative abnormal return to (-5, +5) was firm size with positive effect. Significant determinants of cumulative abnormal return to (-40, +40) were reserve ratio and debt ratio. Reserve ratio has positive effect But debt ratio has negative effect. Significant determinants of cumulative abnormal return to (0, 1 year) were firm size, debt ratio, reserve ratio. equity ratio to large shareholder. Firm size, debt ratio, equity ratio to large shareholder have negative effect. But reserve ratio has positive effect.
A Dispatching Method for Manufacturing Process with Quality Volatilities
Shin, Hyun-Joon ; Ryu, Jae-Pil ; Son, Min ;
Journal of the Korea Academia-Industrial cooperation Society, volume 13, issue 4, 2012, Pages 1648~1653
DOI : 10.5762/KAIS.2012.13.4.1648
In general, fault of a virtually finished product that is value-added one, since it has gone throughout the most of processes, may give rise to quality cost nearly amount to its selling price and can be a main cause that decreases the efficiency of manufacturing process. This paper proposes a dispatching algorithm for manufacturing process with quality volatilities with consideration of due-dates and required quality level. In order to evaluate the proposed algorithm, this paper examines the performance of the proposed method by comparing it with that of the existing dispatching algorithms in terms of minimizing the mean tardiness. In addition, from the perspective of process capability based on required quality level, this study shows the superiority of the proposed dispatching algorithm.
Implementation and evaluation of gerontological nursing education program: consist of knowledge about nursing care for elderly and elderly simulation experience
Oh, Hyun-Soo ; Jeong, Hye-Sun ;
Journal of the Korea Academia-Industrial cooperation Society, volume 13, issue 4, 2012, Pages 1654~1664
DOI : 10.5762/KAIS.2012.13.4.1654
This study was conducted to test whether the education program consisted with knowledge about professional care for elderly and content of elderly simulation experience to improve empathy had positive effects on attitude and intention to practicing nursing care toward elderly. According to the study results, It was appeared that the experimental group provided both knowledge and elderly simulation experience showed more positive attitude toward elderly(t=2.56, p=.026) and intention to practicing nursing care for elderly(t=6.73, p=.003), compared with the group provided knowledge only. However, after experiencing elderly simulation program, the attitude toward elderly(t=1.22, p=.170) and intention to practice nursing care for elderly(t=-0.08, p=.470) in experimental group improved very little or so, whereas the attitude toward elderly(t=-2.33, p=.012) and intention to practice nursing care for elderly(t=-1.08, p=.150) in comparison group became even worse.
Voice Change Associated with Swallowing Disorder Caused by a Stroke After Neuromuscular Electrical Stimulation
Byeon, Hae-Won ;
Journal of the Korea Academia-Industrial cooperation Society, volume 13, issue 4, 2012, Pages 1665~1671
DOI : 10.5762/KAIS.2012.13.4.1665
The purpose of this study was to look into changes in voice using acoustic analysis during the process of neuromuscular electrical stimulation targeting dysphagia treatment. Fifteen man with dysphagia caused by stroke was treated neuromuscular electrical stimulation for two months and intensity of voice,
, Jitter, Shimmer, NNE were measured. The results of this study that improvement in functions of dysphagia and Jitter, Shimmer were stabilized. But there was not significantly changes of
. NNE was improved after the intervention, but still showed abnormal levels. This result suggests a possibility of effects that Neuromuscular electrical stimulation has on stabilization of Jitter, Shimmer and intensity of voice.
The duration of exclusive breastfeeding practice and its related factors of married immigrant Vietnamese women
Koo, Sang-Mee ; Kim, Tae-Im ;
Journal of the Korea Academia-Industrial cooperation Society, volume 13, issue 4, 2012, Pages 1672~1683
DOI : 10.5762/KAIS.2012.13.4.1672
The purpose of this descriptive survey was to investigate the duration of exclusive breastfeeding practice and its related factors of married immigrant Vietnamese women. And to provide baseline information necessary to develop education programs for the promotion of exclusive breastfeeding practice among them. 125 married immigrant Vietnamese women with a child between 6 months and 60 months old were conveniently recruited in two Multi-cultural Family Support Center in Chungcheong area. Data were collected through interviews using a structured questionnaire of Korean and Vietnamese versions. The data were analyzed using frequencies, t-test, ANOVA, Stepwise multiple regression with SPSS 18.0 program. The results were as follows; 1) The mean duration of exclusive breastfeeding of the subjects was 15.9 weeks. 2) As the infants grows older, the rate of formula feeding and mixed feeding were markedly increased. 3) Stepwise multiple regression analysis indicated that breastfeeding education and family type were significant determinants of the duration of exclusive breastfeeding practice. This model accounted for 30.8% of the duration of exclusive breastfeeding practice. Based on these results, we recommend to develop systematic breastfeeding education program in order to promote the duration of exclusive breastfeeding practice among married immigrant Vietnamese women.
Effects of Complex Exercise Program on Pain and Muscle Activation in elderly Patients with Knee Osteoarthritis
Lee, Sun-Ju ; Choi, Won-Ho ; Lim, Chae-Gil ;
Journal of the Korea Academia-Industrial cooperation Society, volume 13, issue 4, 2012, Pages 1684~1689
DOI : 10.5762/KAIS.2012.13.4.1684
This research is performed for the elderly patients who have knee osteoarthritis joint and who are applied to complex exercise program to know that how the complex exercise affects on pain and muscle activation. This research is tested 23 elderly patients who have knee osteoarthritis in hospital B. It divided into exercise group(n=2) and control group(n=1), by doing general physical therapy for each case three times a week, 40 minutes, among 10 weeks and measured before and after VAS and muscle activation. For the case exercise group, supplementally, applied to complex exercise program three times a week, 40 minutes, among 10 weeks and also measured before and after VAS and muscle activation. After the test is performed in 10 weeks, the results of this test are as follows. First, both exercise group and control group, they have more in pain after experiment rather than before, respectively(p<0.05). but There was no significant statistical difference between two groups(p>0.05). Second, exercise group have in muscle activation after experiment rather than before(p<0.05). and There was significant statistical difference between two groups(p<0.05). The test is implied that if the people who has knee osteoarthritis wants to get more good effects with complex exercise, they should get more opportunities to complex exercise. as well as fitness, resistance exercise and grafted to the easily create an exciting program to improve the quality of life of seniors in the program will be studied in future study.
Drinking Pattern and Nonfatal Injuries of Adults in Korea
Yoo, In-Sook ; Choi, Eun-Mi ; Kwon, Ho-Jang ; Lee, Sang-Gyu ;
Journal of the Korea Academia-Industrial cooperation Society, volume 13, issue 4, 2012, Pages 1690~1698
DOI : 10.5762/KAIS.2012.13.4.1690
As alcohol use is one of the most important risk factors for injuries, this study was intended to clarify and evaluate any relationship between drinking patterns and the incidence rates/specific characteristics of injuries in adult populations, using a widely accepted tool, the Alcohol Use Disorders Identification Test (chronic alcohol drinking behaviors measurement, hereinafter the AUDIT) developed by the World Health Organization to help to assess the behaviors in a more accurate and reliable manner. This study used the data collected from the 2009 Korea National Health and Nutrition Examination Survey (KNHANES), in which 7,511 of 7,893 adult participants aged
years answered the questions about injuries, and excluding 104 non-respondents, 6,258 of participants in the questionnaire survey of drinking patterns were finally analyzed. The incidence rates and specific characteristics of injuries as classified by the AUDIT categories (i.e., body regions, types and mechanisms) were assessed and estimated in terms of their relative risk using t-test, ANOVA, and logistic regression. SPSS 19.0 statistical package software was employed for statistical analyses. These analyses indicate that the incidence rates of overall injuries were significantly higher in male respondents than in female respondents. The risks of alcohol use related injuries were 8.3 times higher in male respondents than in female ones. Regarding educational background, high school graduates showed the highest rates in the AUDIT with significant difference from the other groups. The married group and the group of respondents having monthly income estimated at KRW 2.01 to 3 million also showed the highest rates in the AUDIT compared to the other groups, indicating statistically significant difference. Significantly increased in problematic drinkers and those with alcohol dependence, the incidence rate of injuries body regions was 0.0371 in the head/neck, and with respect to the AUDIT and the mechanisms of external causes of injuries, transport accidents ranked first, followed by slippage, others, crash and fall. In regard to the classified types of injuries, it was statistically significant in others (e.g., laceration, contusion, addiction, or penetrating wound). In conclusion, the mechanisms of external causes of injuries as well as injuries attributed to alcohol use are very important, and a strategy is required to reduce such the injuries in the manner of decreasing the frequency of drinking after motivation by professional counsellors.
Effects of Knee Height of CPR Rescuer on the Quality of Chest Compression
Park, Dae-Sung ;
Journal of the Korea Academia-Industrial cooperation Society, volume 13, issue 4, 2012, Pages 1699~1705
DOI : 10.5762/KAIS.2012.13.4.1699
This study was conducted to examine the differences of the quality of chest compression between 10 cm higher position of rescuer's knee from the bottom and its bottom position during implementation of CPR. It selected randomly subjects out of 66 students who attend the Dept. of Emergency Medical Technology in G college, G metropolitan city as the first grader and divided them into 31 experimental group and 32 control group from Nov. 8 to 9, 2011. Mattress was spread 10 cm higher from the bottom(material: B4 Copy Paper) and on the bottom(material: PVC, size:
) and only chest compression was conducted for 2 minutes. Experiment was conducted with 1 Resusci Anne mannequin and the results of experiment were recorded with Laerdal PC Skill Reporting System. Data collected were analyzed with
-test and Fisher's exact probability test using SPSS 14.0 for Window, Mann-Whitney U-test, and Wilcoxon signed rank test. As a result of the study, it was found that 10 cm higher position of rescuer knee from the bottom than the bottom position and group below 170 cm in their height and 65 kg in their weight were more effective in proper depth of chest compression and average chest compression depth.
Needs for Hospice Care among Families of Children with Cancer for Outpatients
Chung, Young-Soon ; Park, Sang-Youn ;
Journal of the Korea Academia-Industrial cooperation Society, volume 13, issue 4, 2012, Pages 1706~1713
DOI : 10.5762/KAIS.2012.13.4.1706
The purpose of this study was to analyze the need for child hospice care in families of children with cancer for outpatient. The participants were 83 parents of children with cancer. This survey was conducted from January 2011 to March 2011 at four hospitals in Daegu. Data were collected through self-report questionnaires and analyzed by descriptive statistics, t-test and ANOVA using the SPSS/WIN Program. Needs for hospice care for the participants were high. The need for "emotional care of children" showed the highest, "control of secondary physical problems", "acceptance of the family's difficulty", "management for terminal physical symptoms", "spiritual care for preparing for death". With respect on the demographic characteristics of the participants, there were statistically significant differences in hospice care needs, among to the religion, sibling, relatives, whether of the cancer. The above findings indicate that needs for hospice care for the participants were high about emotional care, especially as it is related to children's anxiety. Therefore hospice care, based on emotional part, should be provided systematic hospice care with specialized multidisciplinary child hospice care team, child hospice center.
A Study on Various Automatic Exposure Control System in Multi-Detector Computed Tomography by Using Human Phantom
Kim, Yong-Ok ; Seoung, Youl-Hun ;
Journal of the Korea Academia-Industrial cooperation Society, volume 13, issue 4, 2012, Pages 1714~1720
DOI : 10.5762/KAIS.2012.13.4.1714
The purpose of the study was to evaluation of the radiation dose reduction and the possibility of the maintainability of the adequate image quality using various automatic exposure control (AEC) systems in multi-detector computed tomography (MDCT). We used three AEC systems for the study: General Electric Healthcare (Auto-mA 3D), Philips Medical systems (DoseRight) and Siemens Medical Solutions (Care Dose 4D). The general scanning protocol was created for the each examination with the same scanning parameters as many as possible. In the various AEC systems, the evaluation of reduced-dose was evaluated by comparing to fixed mAs with using human phantom. The image quality of the phantom was evaluated with measuring the image noise (standard deviation) by insert regions of interests. Finally, when we applied to AEC for three manufacturers, the radiation dose reduction decreased each 35.3% in the Auto-mA 3D, 58.2% in the DoseRight, and 48.6% in the Care Dose 4D. And, there was not statistical significant difference among the image quality in the Strong/Weak of the Care Dose 4D(P=.269). This applies to variety of the AEC systems which will be very useful to reduce the dose and to maintain the high quality.
Loneliness and Spiritual Needs of the Senior School Elderly in a Certain Area
Kim, Ju-Ok ; Ryoo, Eon-Na ; Ha, Eun-Ho ;
Journal of the Korea Academia-Industrial cooperation Society, volume 13, issue 4, 2012, Pages 1721~1727
DOI : 10.5762/KAIS.2012.13.4.1721
The purpose of this study was to identify the loneliness and spiritual needs of the elderly in a certain area. The participants in this study were over 65 years, 159 elderly who attended in senior classes in Seoul. The instruments used for this study were revised UCLA 'Loneliness scale' developed by Russell, Peplau & Cutrona (1980) and translated by Kim & Kim (1989) and 'Spiritual need scale' developed by Yong (2008). The collected data were analyzed using SPSS 15.0 program, t-test, ANOVA, Scheffe's test and Pearson's correlation coefficient. The score of loneliness was 2.02/4, spiritual need was 4.51/5. The relationship between loneliness and spiritual needs showed significant negative correlation. Loneliness of the elderly who do not attend a religious attendance was high and spiritual needs were low. Spiritual needs of the elderly who are women over 80 years and living with subsidy from the government were high. Spiritual nursing interventions are needed to reduce a feeling of loneliness among the elderly who experience high degree of loneliness.
A Study on the Relationships between Occupational Therapists' Burn-out, Professional Self-concept, and Self-efficacy
Hwang, Sang-Hui ;
Journal of the Korea Academia-Industrial cooperation Society, volume 13, issue 4, 2012, Pages 1728~1738
DOI : 10.5762/KAIS.2012.13.4.1728
The purpose of this study was to examine the degree of occupational therapists' burn-out, professional self-concept, and self-efficacy and also their socio-demographic characteristics and to verify the effects of professional self-concept and self-efficacy on their burn-out. The subjects of this survey were 138 occupational therapists who perform occupational therapy. From October 13th till November 2nd, 2011, a structuralized questionnaire was used to collect data. The results of this study were follows: First, the occupational therapists' mean score of burn-out was 2.12(range: 0-6), and the mean score of professional self-concept and self-efficacy were 2.64(range: 1-4) and 3.56(range: 1-5). Second, according to the general characteristics of the occupational therapists, burn-out showed significant difference by treatment hours per day, duty to work on Saturdays, aptitude and religion. Third, professional self-concept had positive correlation with self-efficacy. And professional self-concept and self-efficacy showed negative correlation with burn-out. Fourth, chief variables affecting occupational therapists' burn-out were professional self-concept and religion. Therefore it is necessary to reduce occupational therapists' burn-out and improve the services of their occupational therapy qualitatively by developing programs to enhance their professional self-concept.
Comparison of Hospital Standardized Mortality Ratio Using National Hospital Discharge Injury Data
Park, Jong-Ho ; Kim, Yoo-Mi ; Kim, Sung-Soo ; Kim, Won-Joong ; Kang, Sung-Hong ;
Journal of the Korea Academia-Industrial cooperation Society, volume 13, issue 4, 2012, Pages 1739~1750
DOI : 10.5762/KAIS.2012.13.4.1739
This study was to develop the assessment of medical service outcome using administration data through compared with hospital standardized mortality ratios(HSMR) in various hospitals. This study analyzed 63,664 cases of Hospital Discharge Injury Data of 2007 and 2008, provided by Korea Centers for Disease Control and Prevention. We used data mining technique and compared decision tree and logistic regression for developing risk-adjustment model of in-hospital mortality. Our Analysis shows that gender, length of stay, Elixhauser comorbidity index, hospitalization path, and primary diagnosis are main variables which influence mortality ratio. By comparing hospital standardized mortality ratios(HSMR) with standardized variables, we found concrete differences (55.6-201.6) of hospital standardized mortality ratios(HSMR) among hospitals. This proves that there are quality-gaps of medical service among hospitals. This study outcome should be utilized more to achieve the improvement of the quality of medical service.
Comparative analysis of blood glucose test results on the forearm, finger, and vein
Kim, Kyung-Ah ; Lee, In-Kwang ; Shin, Eun-Young ; Kim, Yang-Mi ; Kim, Kyoung-Oak ; Cha, Eun-Jong ; Park, Kyung-Soon ;
Journal of the Korea Academia-Industrial cooperation Society, volume 13, issue 4, 2012, Pages 1751~1758
DOI : 10.5762/KAIS.2012.13.4.1751
Capillary blood sampling on the forearm reduces pain caused by skin puncture. The present study compared the blood glucose test results performed at different sampling sites of the forearm, finger, and vein to evaluate clinical validity of this alternative site blood sampling technique. Subjects numbered 555 including 61 diabetic patients participated to measure the glucose concentration on the finger (
) and the forearm (
) with a portable glucometer under overnight fasting state. Then, the venous glucose concentration (
) was measured in 514 subjects in less than 1 hour. The test results were analyzed by simple linear regression, intraclass correlation, and Passing-Bablok regression techniques.
was highly correlated with
showing the correlation coefficients (r) of approximately 0.97 (P<0.0001) in the normal group. The patient group also resulted similarly high correlation with only slightly lower r value. The mean differences in glucose concentration were less than
regardless of the sampling sites. Intraclass correlation coefficients were slightly smaller than r but very much similar in value in both groups. The 95% confidence intervals of the slope as well as the intercept in the Passing-Bablok regression analysis were <
, respectively, which were within the clinically acceptable ranges. These three statistical techniques introduced in the present study well demonstrated the consistency of
. Therefore, the forearm blood glucose test could be considered as clinically valid under fasting condition.
Relationship Between Job Stress and Fatigue Symptoms Among Nurses in a University Hospital
Kim, Soon-Young ; Kwon, In-Sun ; Cho, Young-Chae ;
Journal of the Korea Academia-Industrial cooperation Society, volume 13, issue 4, 2012, Pages 1759~1768
DOI : 10.5762/KAIS.2012.13.4.1759
The present study was intended to measure the level of fatigue symptoms among nurses working for a university hospital and to reveal its related factors. The self-administered questionnaires were given to 450 nurses during the period from October 1st to 31st, 2010. As a results, the level of fatigue symptoms were 75.1% in normal group, and the high-risk group 24.9%. The level of fatigue symptoms reflected in job stress contents were higher as job demand was higher, and the autonomy of job and the supervisor support was lower. In correlations, fatigue symptoms were found to be in a positive correlation with job demand, whereas in negative correlation with autonomy of job and supervisor support. The adjusted odds ratio of fatigue symptoms on job demand were significantly increased in the high risk group than in low group, but autonomy of job. were significantly decreased in the high risk group than in low group. In conclusion, the study results indicated that the level of fatigue symptoms is independently influenced by job stress contents.
Protective Effects of HEAC and its Primary Active Compound on HCl-ethanol Induced Gastritis in Rats
Choi, Won-Sik ; Jang, Do-Yoen ; Lee, Gyung-Rak ; Kim, Seung-Han ;
Journal of the Korea Academia-Industrial cooperation Society, volume 13, issue 4, 2012, Pages 1769~1776
DOI : 10.5762/KAIS.2012.13.4.1769
The purpose of this study is to evaluate the gastric mucosal damage effect by Hericium erinaceus cultibated with Artemisia capillaris (HEAC) with 0.15 M HCl in ethanol in rats. Among them, 80% ethanol extract showed potent inhibitory effect (67.7%) on gastritis. Using solvent fractionation, 80% ethanol extract of HEAC was separated into five fractions with
-hexane, methylene chloride, ethyl acetate,
-butanol and water. As a result, fractions obtained with methylene chloride exhibited strong inhibitory effects on gastritis. With this result, the methylene chloride extract was analyzed by GC/MS, HPLC, IR and NMR(
) to identify primary active components and the main component in the extract was identified as ethyl linoleate. The effective does (
) values of 80% ethanol extract of HEAC and ethyl linoleate showed 22.6 and 6.4 mg/kg, respectively and these values were higher than those of stillen (44.2 mg/kg) and selbex (46.5 mg/kg). Therefore, the administration of 80% ethanol extract of HEAC and ethyl linoleate have a strong protective effect agasint the gastritis induced by HCl-ethanol and may be promising new drug for treating gastritis and gastric ulcer.
Development of A DC Motor Controller for 24V-500W Small Electric Vehicle
Bang, Jun-Ho ; Lee, Woo-Choun ; Yu, Jae-Young ;
Journal of the Korea Academia-Industrial cooperation Society, volume 13, issue 4, 2012, Pages 1777~1783
DOI : 10.5762/KAIS.2012.13.4.1777
In this paper, a new motor driving circuit is designed to improve the output performance of DC motor, and a controller is developed with the designed circuit. By the designed driving circuit, a controller can continuously drive DC motors by a transformer which has switching signals of a self-generated circuit to operate it. And while the DC motor have a maximum velocity, the reference voltage can be maintained higher value than that of triangle voltage and it makes the DC motor driving transistor ON and maximum power. A 24V-500W DC motor controller is developed with the proposed motor driving circuit, and also a small electric car is made and the driving test of it is executed. The test results shows that it can continuously control go and back speed of motor with 12A driving current. And also, it is verified that the over current and heat detecting function is operating correctly and the rest value of the used battery can be displayed as 6 step from 20 to 100%.
A Study on the Condition for Error Probability Maintenance in On-Off Keying Transmission System
Ra, Yoo-Chan ;
Journal of the Korea Academia-Industrial cooperation Society, volume 13, issue 4, 2012, Pages 1784~1788
DOI : 10.5762/KAIS.2012.13.4.1784
In this paper we considered condition for keep standard error probability in optical transmission system that applied on-off keying transmission which are modulated amplitude along the signal. we calculated received sensitivity of receiver in on-off keying transmission for optical detector have quantum efficiency belong 1 in optical transmission system. For BT is over 30, the number of photon is belong 10000 for maintain standard error probability. also we considered Also, we install a preamplifier to the receiver for considering the low output may be used with a light that was able to get results.
A New High-Efficiency CMOS Darlington-Pair Type Bridge Rectifier for Driving RFID Tag Chips
Park, Kwang-Min ;
Journal of the Korea Academia-Industrial cooperation Society, volume 13, issue 4, 2012, Pages 1789~1796
DOI : 10.5762/KAIS.2012.13.4.1789
In this paper, a new high-efficiency CMOS bridge rectifier for driving RFID tag chips is designed and analyzed. The input stage of the proposed rectifier is designed as a cascade structure connected with two NMOSs for reducing the gate capacitance by circuitry method, which is the main path of the leakage current that is increased when the operating frequency is increased. This gate capacitance reduction technique using the cascade input stage for reducing the gate leakage current is presented theoretically. The output characteristics of the proposed rectifier are derived analytically using its high frequency small-signal equivalent circuit. For the general load resistance of
, the proposed rectifier shows better power conversion efficiencies of 28.9% for 915MHz UHF (for ISO 18000 -6) and 15.3% for 2.45GHz microwave (for ISO 18000-4) than those of 26.3% and 26.8% for 915MHz, and 13.2% and 12.6% for 2.45GHz of compared other two existing rectifiers. Therefore, the proposed rectifier may be used as a general purpose rectifier to drive tag chips for various RFID systems.
A Study on Power LED driving constant Current-type DC-DC converter Driven using microcontroller
Hwang, Lark-Hoon ; Na, Seung-Kwon ; Choi, Gi-Ho ;
Journal of the Korea Academia-Industrial cooperation Society, volume 13, issue 4, 2012, Pages 1797~1805
DOI : 10.5762/KAIS.2012.13.4.1797
In this paper, Power LED(Light Emitting Diodes) is studied to driver as a new lighting system in the spotlight, replacing a large existing lighting system with fluorescent and incandescent lighting. To take advantage a variety of DC power as the boost DC-DC converter design specifications through the inductor L and capacitor C through PSPICE to calculate the best estimate of the value. Converter's switching frequency is 50[kHz], the first Duty Rate was made to increase gradually depending on the value of the detection were, 10[%] in the output voltage. As a result, the simulated Boost Power LED driver characteristics is in comparison with the design specifications, 5[%] or less as the error was approximated. So, when input 15[V] were offered, a stable output 24[V] were obtained, and Dimming Control through the adjustment of brightness and current consumption were obtained to possible result.
Modeling of Hybrid Generation System with Wind Turbine and Diesel Generator
Kim, Jae-Eon ;
Journal of the Korea Academia-Industrial cooperation Society, volume 13, issue 4, 2012, Pages 1806~1813
DOI : 10.5762/KAIS.2012.13.4.1806
This paper proposes a modeling method for hybrid generation system with wind turbine and diesel generator applicable in island area. For modeling objects, squirrel-cage induction generator is considered as wind turbine generator and synchronous generator as diesel generator. Parameters and controllers related to them are established and modeled through analysis of traditional small capacity class. The simulation results for practical size hybrid generation system were suggested.
Simulation Model Development of Korean LVRT capability for evaluating the WTG-interconnected Power Systems Performance
Han, Jun-Bum ; Son, Hyeok-Jin ; Kook, Kyung-Soo ;
Journal of the Korea Academia-Industrial cooperation Society, volume 13, issue 4, 2012, Pages 1814~1821
DOI : 10.5762/KAIS.2012.13.4.1814
As a new Korean grid code which includes LVRT requirement to wind farm of which capacity is greater than 20MW is activated in 2012, this paper developed the analytical model of the Korean LVRT for the simulation based feasibility study of the wind farm interconnection into power systems. The developed model of the LVRT is verified by applying it into the performance evaluation of the wind farm interconnected power systems and the effect of Korean LVRT is analyzed through case studies considering typical disturbances of power systems.
A Study on the Improvement Plan of Information Process Model in C4ISR Effectiveness Analysis Model DNS
Lee, Kwang-Myoung ; Hong, Yoon-Gee ;
Journal of the Korea Academia-Industrial cooperation Society, volume 13, issue 4, 2012, Pages 1822~1829
DOI : 10.5762/KAIS.2012.13.4.1822
In this research, we developed the Information Circulation Model(ICM) by modifying and supplementing Information Process Model(IPM) in DNS. This ICM is used to simulate some combat situations that could not be considered with the existing DNS. We showed that this improved ICM can be applied to simulation and analysis of a variety of interests compared with IPM in DNS. We expect this study could be a basic research for further development of C4ISR effectiveness analysis in our national defense community.
Enhanced Mode Estimation Method for Intra/Inter Prediction in H.264/AVC
Park, Kyung-Seok ; Kim, Min-Jun ; Jun, Jae-Hyun ; Ryu, Sang-Ryul ; Kim, Snng-Ho ;
Journal of the Korea Academia-Industrial cooperation Society, volume 13, issue 4, 2012, Pages 1830~1838
DOI : 10.5762/KAIS.2012.13.4.1830
The intra prediction and the motion estimation of inter prediction occupy 70 ~ 80% of whole compression time in H.264/AVC. Compression efficiency has been higher, but complexity has increased and coding time has also increased much more. This paper proposes a block size decision method of the intra prediction and mode decision method which minimize the loss of video quality during the encoding and shorten the time spent. This paper, in addition, proposes an algorithm which determines the method of adaptive block mode for motion estimation of inter prediction. We investigated PSNR and the intra prediction and inter prediction of time-consuming calculations in order to measure video quality degradation and complexity through experiments. Consequently, when you use all three methods, these methods showed that average coding time is shortened as about 500 to 600ms in every frame in the case of all experimented videos, keeping video quality nearly similar, compared with existing methods of H.264.
A Secure WPA-PSK Protocol Resistant to Dictionary Attack on Smartphone Communication Using Wi-Fi Channel
Park, Geun-Duk ; Park, Jeong-Soo ; Ha, Jae-Cheol ;
Journal of the Korea Academia-Industrial cooperation Society, volume 13, issue 4, 2012, Pages 1839~1848
DOI : 10.5762/KAIS.2012.13.4.1839
Recently, smartphone communications using Wi-Fi channel are increasing rapidly to provide diverse internet services. The WPA security protocol was used for data protection between user and wireless AP. However, WPA-PSK protocol was known to be weak to the dictionary attack. In this paper, we proposed a secure WPA-PSK protocol to resist the dictionary attack. Since the proposed method was designed to generate a strong encryption key which is combined the Diffie-Hellman key agreement scheme with secrecy property of PSK(Pre-Shared Key), we can protect the Wi-Fi channel from Man-In-The-Middle attack and Rogue AP impersonation attack.
Remote Control through Tracking of Pupil on Mobile Device
Kim, Su-Sun ; Kang, Seok-Hoon ; Kim, Seon-Woon ;
Journal of the Korea Academia-Industrial cooperation Society, volume 13, issue 4, 2012, Pages 1849~1856
DOI : 10.5762/KAIS.2012.13.4.1849
This paper proposes a method to track the center of pupil and perform the remote control for interface based on the substituted commands according to movements of pupil under smart phone environment. The proposed method, which is a remote control through the movement of eyes, may be helpful for the handicapped people or users who want a more convenient input method. A method based on webcam, which is representative one among the previous methods to track pupil of user, has a few limitations on distance and angle between location of user and webcam. However, this paper uses smart phone that is convenient to carry. The proposed method can perform the remote control through tracking of pupil using wireless network without any restriction on the location of users. Thus, the method is effectively applied for controlling the smart TV that should be controlled on the distance as well as the remote control for PC.
Modelling and Analysis for Sharing of Full Electric Vehicles in Small-sized Cities
Jin, Young-Goun ; Cho, Hyun-Seob ;
Journal of the Korea Academia-Industrial cooperation Society, volume 13, issue 4, 2012, Pages 1857~1862
DOI : 10.5762/KAIS.2012.13.4.1857
It is very difficult to construct and manager public transit, like subway, in small city. In this paper, we suggest full electric vehicle sharing service framework as a public transit system in small city. The suggested system will reduce environment pollution and increase resource usage efficiency. The simulation result shows that the suggested electric vehicle sharing system can reduce traffic congestion and lower city road stress.
A Study on Evaluation Criteria for quantitatively OSS Selection
Lee, Hoo-Jae ; Kim, Doo-Yeon ; Choi, Il-Woo ;
Journal of the Korea Academia-Industrial cooperation Society, volume 13, issue 4, 2012, Pages 1863~1871
DOI : 10.5762/KAIS.2012.13.4.1863
Utilization of the former OSS was mainly focused on the usage of system applications such as operating system and DBMS. However, nowadays many companies are trying to make use of OSS based on the application rather than the system software. However, selection of base OSS is the most important to develop of application for utilizing OSS. The scope of existing OSS evaluation studies is covered the entire OSS quality. Thus existing studies of evaluation of OSS selection is insufficient. Also, the result of assessment is based on qualitative measurement rather than quantitative ones. In this paper, we derives only the indicators for selection among the existing OSS assessment indicators and suggests the assessment indicator that is capable of quantitative assessment in accordance with the characteristics of the project. The proposed assessment indicator is divided into an initial assessment indicator that can be assessed with only the information within the OSS community, and the detailed assessment indicator through metrics to make quantitative measurements possible. In this way, an objective basis can be provided through quantitative scores & indicators when selecting OSS.
A Study on the Occurrence Characteristics of Usage Pattern in Outdoor Spaces inside High-Rise Apartment Housing Estates
Kwak, Youn-Chung ;
Journal of the Korea Academia-Industrial cooperation Society, volume 13, issue 4, 2012, Pages 1872~1879
DOI : 10.5762/KAIS.2012.13.4.1872
By analyzing the use of outdoor space in apartment complex and finding empirical proof which is concrete and systemic, this study focuses on the relationship between residents' daily lives and physical space. This study tries to find out the types and characteristics of outdoor space which causes the occurrence of residents' use in High-Rise apartment housing Estates, and analyzes the residents' usage pattern of outdoor space in eight different apartment complexes which were builted since 2004. After analyzing the usage pattern of outdoor space, the usage of playground was ranked highest and playing, talking, exercising, resting was in order. Especially it was found that the usage inside semi-public space where passing is abundant increases.
A sutdy on the District Unit Design by Traffic Assignment
Jin, Jang-Won ;
Journal of the Korea Academia-Industrial cooperation Society, volume 13, issue 4, 2012, Pages 1880~1888
DOI : 10.5762/KAIS.2012.13.4.1880
This study tried to analyze traffic assignment volume by application of land use patterns and transport policies in District Unit Design. It is postulated a Toy network and various scenarios which are combined land use patterns and transport policies for analyzing change of assignment volume. As results, this study shows best District Unit Design technique is the policy that develop mid block and introduction of car free zone to inner 2 way streets. Worst design technique is the policy that introduction of joint car parking to mid block. And also worst design technique to residents who are living in inner block is the policy that just develop only one center zone.
Small Scaled Laboratory Test of Eco-Friendly Backfill Materials with Bottom Ash
Lee, Kwan-Ho ; Lee, Kyung-Jung ;
Journal of the Korea Academia-Industrial cooperation Society, volume 13, issue 4, 2012, Pages 1889~1894
DOI : 10.5762/KAIS.2012.13.4.1889
A small-scale chamber test laboratory for controlled low strength materials with bottom ash and recycled in-situ soil have been carried out. Laboratory test which was simulated during construction stage was conducted. The vertical deflection of 4.43mm to 6.6mm, and the horizontal deflection of 5.49mm to 15.9 mm were measured during backfilling. In case of loading, the vertical deflection of 2.41mm to 8.69mm, and the horizontal deflection of 1.66mm to 2.53mm were measured. Its residual deflections were 1.40mm to 5.93mm for vertical and 1.66mm to 2.53mm for lateral. The vertical and horizontal deflecto of controlled low strength materials were smaller than that of sand backfill. Also, it was same trend for the measured surface settlement.
Finite Difference Method on Consolidation under Time Dependent Loading
Lee, Seung-Hyun ;
Journal of the Korea Academia-Industrial cooperation Society, volume 13, issue 4, 2012, Pages 1895~1899
DOI : 10.5762/KAIS.2012.13.4.1895
Formulation of finite difference method for analyzing consolidation were carried out. It can be seen that the differences in settlement with time obtained by FDM and Terzaghi method are diminished by fine discretization of time increment. Excess pore pressures predicted by the derived finite difference equation were same as those calculated by Olson's method. Predicted time-settlement behavior from the derived finite difference method were almost same as those calculated by Terzaghi's method and Olson's method. Analysis results obtained from the assumed multi-step time dependent loading are thought to be reasonable.
Finite Element Analyses on Local Buckling Strength of Polygonal-Section Shell Towers
Park, Seong-Mi ; Choi, Byung-Ho ;
Journal of the Korea Academia-Industrial cooperation Society, volume 13, issue 4, 2012, Pages 1900~1907
DOI : 10.5762/KAIS.2012.13.4.1900
Since the subpanels of polygonal-section shell have the corners of an obtuse angle larger than 90 degree unlike general plate or box-section structures, this could have an influence on forming nodal lines against local plate buckling or stress distributions. However, there is not sufficient material in the relevant study results or design recommendations. The very feasible models of the initial imperfections were acquired through the literature studies and then the parametric studies were conducted along with the initial imperfection models by using the finite element method. The parameters like the size of residual stresses, the portion of compressive residual stresses, and steel grades were considered. From the parametric studies, it was found that the maximum residual stress is more influential factor than the distribution pattern of residual stresses. In addition, The design strength equations for the simply supported plates can be applicable to the determination of the local buckling strength of the polygonal cross-section shell structures.
Economic Feasibility of Bucket Foundation for Offshore Wind Farm
Oh, Myoung-Hak ; Kwon, O-Soon ; Kim, Keun-Soo ; Jang, In-Sung ;
Journal of the Korea Academia-Industrial cooperation Society, volume 13, issue 4, 2012, Pages 1908~1914
DOI : 10.5762/KAIS.2012.13.4.1908
As the turbine capacity and the water depth of wind farms are increasing, the construction cost of substructures and foundations for offshore wind turbines is expected to increase. Since the installation of suction bucket foundation is achieved by both self-weight and applied suction, the construction generally does not require heavy equipment for penetration. This study provides an economic analysis on the tripod which have the bucket foundations and compares that the jacket foundation at 50m water depth on sand layer or soft layer. As the strength of the soil and the number of the foundation is increasing, the construction cost of the tripod with the bucket foundations is more economically feasible than the jacket foundation.
Synthesis of Mesoporous Transition Metal Carbon Using the Mesoporous Silica
Han, Seung-Dong ; Jeong, Ui-Min ; Lee, Joo-Bo ; Peng, Mei Mei ; Kim, Dae-Kyung ; Jang, Hyun-Tae ;
Journal of the Korea Academia-Industrial cooperation Society, volume 13, issue 4, 2012, Pages 1915~1922
DOI : 10.5762/KAIS.2012.13.4.1915
In this study, synthesis of mesoporous silica such as, SBA-15, MCM-41, MCM-48, KIT-6 according to various experimental conditions. The CMK(Carbon Mesoporous Korea) was synthsized by various mesoporous silica. Finally, the mesoporous transition metal structure synthesized using CMK structure. Nitrogen adsorption/ desorption, SEM, low angle X-ray diffraction were carried for analysis of each sample. The optimum synthesis condition of mesoporous transition metal structure derived from characteristic analysis. The SBA-15 is best precursor for synthesis of mesoporous transition metal structure. The surface area of copper mesorporous structure from CMK(SBA-15) is
, pore diameter is 2.91nm by BET analysis.
Removal of Mn Based Catalyst for the Pretreatment Condition and Sulfur Dioxide
Park, Kwang-Hee ; You, Seung-Han ; Park, Young-Ok ; Kim, Sang-Wung ; Cha, Wang-Seog ;
Journal of the Korea Academia-Industrial cooperation Society, volume 13, issue 4, 2012, Pages 1923~1930
DOI : 10.5762/KAIS.2012.13.4.1923
Mn-Cu catalysts were tested for selective catalytic reduction of NOx with NH3. Influence of initial reaction temperature was studied for NOx conversion in which reaction temperature was changed three patterns. NOx conversion of catalysts calcined at 200, 300 and
was measured during the changing temperature. Hydrogen conversion efficiency of calcined catalysts was also measured in the
-TPR system. The deactivation effect of
on catalyst was investigated with the on-off control of
supply. The catalyst which calcined above
was somewhat deactivated with thermal shock. The reason of deactivation was draw from the results of surface area and hydrogen conversion.
Assessment of location of the air quality monitoring stations according to the analysis of wind sector division in Pohang
Jung, Jong-Hyeon ; Lee, Hyung-Don ; Shon, Byung-Hyun ;
Journal of the Korea Academia-Industrial cooperation Society, volume 13, issue 4, 2012, Pages 1931~1938
DOI : 10.5762/KAIS.2012.13.4.1931
This study evaluated whether the installed location of air quality monitoring stations is at an optimal level in an effort to improve the health and environmental quality of the surrounding areas of the Pohang Steel Complex. As a result of analyzing the atmospheric flow field, it was found that the location of air quality monitoring stations was acceptable in case of Daesong-myeon(The 1st Division of Local Wind Sector) and Jukdo-dong(The 3rd Division of Local Wind Sector). However, the air quality monitoring stations installed at Daedo-dong and Jukdo-dong is judged to have made an overlapped measurement because the stations existed at the Division of the same Wind Sector. Accordingly, this study suggests that the further air quality monitoring stations should be additionally installed at Buk-gu areas of Pohang where more than 50% of the population of Pohang is living presently. As a result of the analysis of air contaminant concentration distribution, the Jangheung-dong area showed higher concentration distribution than other areas in case of
while the Daesong-myeon area showed a comparatively higher concentration distribution in case of
. Conclusively, this study indicates that it is high time to prepare an aggressive management of
which causes a harmful impact on the life and health of the residents of the target areas.