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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of the Korean Society for Aviation and Aeronautics
Journal Basic Information
Journal DOI :
The Korean Society for Aviation and Aeronautics
Editor in Chief :
Volume & Issues
Volume 15, Issue 4 - Dec 2007
Volume 15, Issue 3 - Sep 2007
Volume 15, Issue 2 - Jun 2007
Volume 15, Issue 1 - Mar 2007
Selecting the target year
Effects of Ethanol Mixing Ratio on Spray Characteristics of Triplet Impinging Injector
Lee, In-Chul ; Kim, Jong-Hyun ; Koo, Ja-Ye ;
Journal of the Korean Society for Aviation and Aeronautics, volume 15, issue 4, 2007, Pages 1~8
Spray characteristics of a unlike triplet injector were investigated experimentally. Spray images and SMD of droplet were measured to evaluate the spray characteristics injected by liquid/gas combinations. G-L-G(Gas-Liquid-Gas), L-G-L(Liquid-Gas-Liquid) type of injector were used by changing the gas and liquid feed lines. The SMD graph shows that the droplet sizes decrease in the out of radial direction at a fixed gas Reynolds number. The SMD value of decreasing tendency shows that the more ethyl alcohol ratio increase, the more SMD value decrease.
Tethered Hover Test for Small Scaled Tilt-rotor UAV
Park, Bum-Jin ; Yoo, Chang-Sun ; Chang, Sung-Ho ; Choi, Seong-Wook ; Koo, Sam-Ok ; Kang, Young-Shin ;
Journal of the Korean Society for Aviation and Aeronautics, volume 15, issue 4, 2007, Pages 9~16
Tilt rotor aircraft can take off and land vertically and cruise faster than any other helicopter. A scaled flight demonstration model of a tilt rotor aircraft has been developed by KARI. Because the flight characteristics of tilt rotor are not well known, the developed scaled model would be helpful to evaluate flight control algorithm of a full scale aircraft. The tethered hover test has been performed in order to improve hover flight characteristics of tilt rotor aircraft prior to flight test of the small scaled model. During the tethered hover test, the performance of rotor speed governor, rate SAS (Stability Augmentation System) and control surface mixers have been evaluated. We expect that the results of real flight hover test would be quite same as tethered hover test. Therefore the tethered hover test results will reduce the risk of flight test properly by fixing some of hidden problems which might occur during the flight test. This paper presents the results of tethered hover test in detail and shows how it could be final ground test before flight test. The control mixer gain and rate SAS feedback gains were modified in order to get higher controllability and stability during the tethered hover flight. The rotor governor showed that it could keep rotor RPM constant with very small deviation even during severe pilot collective input change. The tethered hover test results gave pilot and engineers confirmation and experience about the scheduled flight test.
Post-chamber Flow and Performance of the Multi-port Combustor
So, Jung-Soo ; Kim, So-Ra ; Song, Jae-Chon ; Lee, Dong-Hoon ; Yoon, Chang-Jin ; Moon, Hee-Jang ;
Journal of the Korean Society for Aviation and Aeronautics, volume 15, issue 4, 2007, Pages 17~23
This paper describes the flow and performance characteristics inside the post-chamber of the multi-port hybrid rocket motor. Using the computational fluid dynamics (CFD) technique, the non reactive compressible flow fields in the downstream of the fuel grain was numerically calculated. The motor performance obtained from computational results were in agreement with that conducted by the ground motor firing test. Besides, the flow field characteristics inside the post-chamber were discussed under different port numbers (1 port and 3 ports) of the fuel grain. The flow pattern showed that the performance of multi-port hybrid rocket motor having three grain ports is higher than that of the single-port one due mainly to the difference of incoming mass flow rate irrespective to the pressure field.
Computational Vibration Analysis and Evaluation of a Tilt-Rotor Aircraft Considering Equipment Supporting Structures
Kim, Yu-Sung ; Kim, Dong-Man ; Yang, Jian-Ming ; Lee, Jung-Jin ; Kim, Dong-Hyun ;
Journal of the Korean Society for Aviation and Aeronautics, volume 15, issue 4, 2007, Pages 24~32
In this study, computational structural vibration analyses of a smart unmanned aerial vehicle (SUAV) with tilt-rotors due to dynamic hub loads have been conducted considering detailed supporting structures of installed equipments. Three-dimensional dynamic finite element model has been constructed for different fuel conditions and tilting angles corresponding to helicopter, transition and airplane flight modes. Practical computational procedure for modal transient response analysis is successfully established. Also, dynamic loads generated by rotating blades and wakes in the transient and forward flight conditions are calculated by unsteady computational fluid dynamics technique with sliding mesh concept. As the results of present study, transient structural displacements and accelerations of the vibration sensitive equipments are presented in detail. In addition, vibration characteristics of structures and installed equipments of which safe operation is normally limited by the vibration environment specifications are physically investigated for different flight conditions.
Dynamic Analysis of a Helicopter Landing Gear with Considering Flexible Structural Modes
Hyun, Young-O ; Bae, Jae-Seoung ; Kim, Young-Seok ; Hwang, Jae-Up ; Lim, Kyoung-Ho ; Kim, Doo-Man ; Kim, Tae-Wook ; Hwang, Jai-Hyuk ;
Journal of the Korean Society for Aviation and Aeronautics, volume 15, issue 4, 2007, Pages 33~37
In this paper, a dynamic analysis of a helicopter landing gear with considering flexible structural modes has been investigated. The main body of the helicopter has been modeled as a flexible body using FEM code, then a few selected vibration modes of the helicopter main body have been used as basis for the dynamic analysis of the helicopter landing gear. The simulation of dynamic analysis was carried out on the base of ADAMS aircraft module. It has been found by a series of simulation that the flexible structural modes has a significant effect on the dynamic characteristics of helicopter landing gear as the flexibility of the main body is increased.
A Study on Structural Safety of the Solid Fuel Grain by Hot Flow inside a Hybrid Rocket Combustor
Do, Gyu-Sung ; Yoon, Chang-Jin ; Kim, Jin-Kon ; Moon, Hee-Jang ;
Journal of the Korean Society for Aviation and Aeronautics, volume 15, issue 4, 2007, Pages 38~44
This paper describes the structural safety of solid fuel in the Hybrid Rocket Motor (HRM). Hybrid rocket combustion has the distinct regression characteristics which include the process of thermal pyrolysis and fuel vaporization. Most of all, this regression characteristics would structurally affect the strength of the fuel having a multi-port configuration, and even may cause the breaking from the fuel grain. This problem would probably influence the performance and operating safety of HRM. Therefore, for the safe operation of HRM, the critical port radius which determines the structurally safe region was discussed from the heat analysis of the solid fuel.
Emotional Organizational Commitment, Surface Acting, and Personal Accomplishment among Flight Attendants
Lee, Dong-Hui ; Lee, Dong-Myong ;
Journal of the Korean Society for Aviation and Aeronautics, volume 15, issue 4, 2007, Pages 45~52
This study testifies the proposition that in the case of high emotional organizational commitment, through employees perform surface acting, they feel high personal accomplishment. Data was collected from 158 flight attendants of two airlines in Korea. From the hierarchical regression analysis, we could conclude such as follows. First, emotional organizational commitment has a positive effect on surface acting. It means that because employees with high emotional organizational commitment accept organizational goals as theirs, they are willing to perform surface acting. Second, surface acting has a positive effect on personal accomplishment. It means that surface acting has a "positive" side as well as negative one. Third, according to above results, organizations should try to take measures to increase the emotional organizational commitment of flight attendants.
A Study of Passenger's Safety Perception on Domestic Low-Cost Carriers
Kim, Yoon-Tae ; Shin, Chan-Ho ;
Journal of the Korean Society for Aviation and Aeronautics, volume 15, issue 4, 2007, Pages 53~63
This paper examines the safety perception of passengers on low cost carriers which has made several accidents and incidents at the early stage of their business. The concept of low cost carrier is becoming more important to airline industry in Korea. This study achieves the first selecting attribute among airline service factors on domestic flights and try to indicate that how much the passengers trust in the safety of low cost carriers. It is also sets the comparative safety awareness between low cost carriers and two full service national carriers in domestic market. The safety perception of aircraft type can be a major factor for LCC choice in Korea due to frequent accidents and incidents for last two years. More than 60% of LCC passengers have increasingly considered the safety after recent accidents. The low cost airlines' images of the passengers showed that the first image of the LCC was the fare and the second image was safety. This study indicates that most of the LCC travelers will use the international low cost airlines when LCC extend their destination to adjacent countries. For the accomplishment of the low cost carriers' competitiveness in domestic market, they have to try to get rid of bad image for safety and pay extra attention to find out better services other than the safety and develop other strategies to compete against existing full service carriers.
Emotional Labor and Work Attitudes for the Flight Attendants
Lee, Dong-Myong ; Kim, Soo-Ryun ; Kim, Kang-Sik ;
Journal of the Korean Society for Aviation and Aeronautics, volume 15, issue 4, 2007, Pages 64~82
In this study, the work attitude of flight attendants who were performing emotional labor, had been explored. The organizational support system had been analysed to test its effect as a moderator on increasing positive job attitudes. It was found emotional labor had influence on work attitude of flight attendants. Emotional labor consisted in this study deep acting and surface acting. First, deep acting found positively related with job satisfaction and organizational commitment, negatively related with intention to leave. Second, surface acting negatively related with job satisfaction and positively related with intention to leave. This study put organizational support systems as moderator. First, Training has moderating effect on the relationship between deep acting. Organizational support has moderating effect on the relationship between deep acting, intention to leave. Counselling has moderating effect on the relationship between deep acting, job satisfaction. Peer support has same effect on the relationship between deep acting and intention to leave.
A Study on Establelishing Brand Identity of Airport Operator
Kim, Ki-Woong ; Park, Sang-Bum ; Oh, Bung-Chul ; Chang, Soon-Ja ;
Journal of the Korean Society for Aviation and Aeronautics, volume 15, issue 4, 2007, Pages 83~93
The aviation industry is expected to grow faster and the role of it is expected to be bigger as time goes by. Airport operating company is a major part of the aviation industry. For an airport operating company to be successful, strong relationship with customers is essential. One of the methods to acquire the customer loyalty is establishing a brand. For KAC, 'Skycity' should be chosen as the main brand. And along with it, harmonious modeling of a of KAC and BI of Skycity should be devised. By doing this, KAC can gain customers' affection and loyalty.
The Analysis of the Characteristics of Aircraft Turbulence using Radiosonde data
Kim, Young-Chul ; Park, Sang-Hwan ;
Journal of the Korean Society for Aviation and Aeronautics, volume 15, issue 4, 2007, Pages 94~99
The purpose of this study is analysis of aircraft turbulence of mid Korea using VWS from Osan radiosonde data and comparison with the PIREPs reporting the aircraft turbulence during
. The results of this study summarized that the frequence of aircraft events is more higher in winter time and in lower level(near the surface) of the atmosphere from VWS analysis using radiosonde data. And comparison with PIREPs data shows that relatively high skill score(44%) using the VWS method. It appears that the operational forecast skill score of aircraft turbulence is much higher using VWS than empirical method, due to the upgrade of the discrimination criteria of the aircraft turbulence.
A Study on Concatenation of Air & Sea Logistics' Information Using Telematics System;Case of Inchoen u-City
Hong, Seung-Beom ; Kim, Woong-Yi ;
Journal of the Korean Society for Aviation and Aeronautics, volume 15, issue 4, 2007, Pages 100~107
We proposed the concatenation of logistics' Information to constructing the intelligent logistics city that is to manage efficiently cargo distribution as providing at real-time information of cargo location trace and management through the Telematics/RFID. Case of the Incheon of the "Air Logistics Hub", this area is on an increasing trend on the quantity of cargo transport of the Air & Sea cargo system until 2006. As intelligent project of the Air's and the Sea's field is independently developed at each area, it is a problem on the concatenation of logistics' information such as freight location trace and management, operation management and route information of cargo vehicles. Therefore, we propose the advanced transport service model for the concatenating smoothly of Air & Sea cargo system. In this paper, we only manage the model of Air & Sea cargo system of the advance logistics city.
Cost Efficiency in Global Air Transport Industry
Yeo, Kyu-Hun ; Lee, Young-Soo ;
Journal of the Korean Society for Aviation and Aeronautics, volume 15, issue 4, 2007, Pages 108~116
The purpose of this study is to analyze the technical and cost efficiency of Air Transport Industry on Global strategic alliances. In particular, this study develops Stochastic Frontier Approach for accurate judgement. Based on 20 major international airline corporations related with strategic alliances during the period 1995-2001, we find that alliances make a significant contribution to efficiency. On the other hand, it is found that the level of contribution to efficiency is different according to alliances. These results also changed greatly between pre- and post- Asian financial crisis period.
A study on the Enhancement for Minimum Connecting Time of Incheon International Airport
Lee, Kang-Suk ;
Journal of the Korean Society for Aviation and Aeronautics, volume 15, issue 4, 2007, Pages 117~130
Incheon International Airport has handled 3,054,485 transfer passengers (11.9% transfer rate) and 950,441 transfer cargo(44.2% transfer rate)recorded in 2005. Comparing to 30-40% transfer passenger rate which are competition hub airports in northeast Asia, transfer passenger rate of Incheon International Airport is lower. Above all, We think that Minimum Connecting Time(MCT) which is relating factors with transfer rate need to be monitored to make up for the weak points in the current Incheon internationalairport system. Minimum Connecting Time is defined the legally minimum time necessary to change planes at a given airport. and Transfers represent 35% of the total passenger volume at Vienna International Airport in Europe, which underscores our function as a major international hub. Vienna is rated priority in reservation systems because of our excellent minimum connecting time, and that increases the sale of tickets through our airport. In 2004 the total number of transfer passengers rose 18% to 5,089,624. Short routes, a one roof concept and an outstanding logistics system make Vienna an ideal airport for transfers. This transfer-friendly one roof concept will also form the basis for the new VlE-Skylink Terminal. In case of Japan, Star Alliance has also implemented its so called "Move under one roof"concept at the new Centrair airport. All member carriers are located in the same part of the termina1, sharing check-in counters and ticketing facilities. Star Alliance member carriers can now offer customersa reduced average minimum connecting time of one hour, for transfers between international and domestic. The research purpose of the Study on the Enhancement for Minimum Connecting Time of Incheon International Airport is to increase transfer rate of passenger and cargo of Incheon International Airport at Northeast Asia through this paper.
Strategic Alliances and Productivity in Air Transport Industry
Yeo, Kyu-Hun ; Lee, Young-Soo ;
Journal of the Korean Society for Aviation and Aeronautics, volume 15, issue 4, 2007, Pages 131~141
This paper identifies the productivity in the Global Air Transport Industry for the period of 1995-2001 by testing the Total Factor Productivity with tonqvist method. Based on panel data from 20 major international airline corporations which formed global strategic alliances, we find alliances make a considerably significant contribution to productivity increases. We also find that total factor productivity rate changed surprisingly in Air Transport Industry between pre- and post-Asian financial crisis period.
The understanding of the Longitudinal Static Stability Flight Test
Lee, Ju-Ha ;
Journal of the Korean Society for Aviation and Aeronautics, volume 15, issue 4, 2007, Pages 142~147
When the aircraft is developed, several flight tests are performed including stability and controllability, performance and systems, above all the most important part of the flight test is stability test. Stability test is divided into two parts, static stability and dynamic stability. Static stability of the aircraft is typically defined in terms of its initial tendency to return to equilibrium after a disturbance and not included time concept. One of static stability, longitudinal static stability, was addressed here. The longitudinal static stability was studied from the basic theory to the flight test method and also explained data reduction method throughout the flight test. Finally showed how to meet the specifications such as ROC, FAR and MIL-specifications.