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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korea Institute of Information and Communication Engineering
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The Korean Institute of Information and Commucation Engineering
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Volume & Issues
Volume 15, Issue 12 - Dec 2011
Volume 15, Issue 11 - Nov 2011
Volume 15, Issue 10 - Oct 2011
Volume 15, Issue 9 - Sep 2011
Volume 15, Issue 8 - Aug 2011
Volume 15, Issue 7 - Jul 2011
Volume 15, Issue 6 - Jun 2011
Volume 15, Issue 5 - May 2011
Volume 15, Issue 4 - Apr 2011
Volume 15, Issue 3 - Mar 2011
Volume 15, Issue 2 - Feb 2011
Volume 15, Issue 1 - Jan 2011
Selecting the target year
A New Ensemble System using Dynamic Weighting Method
Seo, Dong-Hun ; Lee, Won-Don ;
Journal of the Korea Institute of Information and Communication Engineering, volume 15, issue 6, 2011, Pages 1213~1220
DOI : 10.6109/jkiice.2011.15.6.1213
In this paper, a new ensemble system using dynamic weighting method with added weight information into classifiers is proposed. The weights used in the traditional ensemble system are those after the training phase. Once extracted, the weights in the traditional ensemble system remain fixed regardless of the test data set. One way to circumvent this problem in the gating networks is to update the weights dynamically by adding processes making architectural hierarchies, but it has the drawback of added processes. A simple method to update weights dynamically, without added processes, is proposed, which can be applied to the already established ensemble system without much of the architectural modification. Experiment shows that this method performs better than AdaBoost.
Analysis of Soret-type Fresnel Zone Plate Lens Antenna using TLM method
Kim, Tae-Yong ; Jo, Heung-Kuk ;
Journal of the Korea Institute of Information and Communication Engineering, volume 15, issue 6, 2011, Pages 1221~1226
DOI : 10.6109/jkiice.2011.15.6.1221
In order to analyze the receiver gain characteristic of the Soret-type FZPL lens antenna which is operated at 12GHz, TLM method can be applied. The application of the FZPL lens antenna is often use the receiver for satellite TV system, radio telescope, and Geodetic System. Some numerical results computed by TLM method are compared with Kirchhoff`s approximation and PO method. The focal characteristic of receiver gain on main axis of the FZPL is mostly shown at the front side, which means that the position of the receiver should be properly calibrated.
Design and Fabrication of Dielectric Duplexers and Bandpass Filters for CDMA and W-CDMA Dualband Using the Notch and Isolation
Choi, U-Sung ; Yang, Sung-Hyun ;
Journal of the Korea Institute of Information and Communication Engineering, volume 15, issue 6, 2011, Pages 1227~1232
DOI : 10.6109/jkiice.2011.15.6.1227
Using the notch and isolation, we investigated the insertion loss and isolation characterics of the fabricated dielectric duplexers and bandpass filters for CDMA and W-CDMA dualband. Insertion loss(Tx band) and isolation(between Tx and Rx) of duplxer were about -2.1708dB and 45dB at CDMA band, respectively. Also, in the case of W-CDMA, the insertion loss(Tx band) and isolation(between Tx and Rx) showed about -2.6946 and 100dB, respectively. Summering the aboved results, fabricated the dielectric duplexers and bandpass filters will be contributed the increase of atttenuation and the decrease of interference at CDMA and W-CDMA dualband.
Design and Fabrication of Dielectric Filters for Celluar and DCS Bands with Isolator
Choi, U-Sung ; Yang, Sung-Hyun ;
Journal of the Korea Institute of Information and Communication Engineering, volume 15, issue 6, 2011, Pages 1233~1237
DOI : 10.6109/jkiice.2011.15.6.1233
Insertion loss, ripple, and return loss were -1.7093dB, 0.9162dB, and -24.762dB with Cellular Rx(824~849 MHz), -1.8021dB, 0.9615dB, and -22.258 with Tx(869~894 MHz), repectively. On the other hand, insertion loss, ripple, and return loss were -2.0149dB, 1.5163dB, and -34.046 dB with DCS Rx(1710~1785 MHz), -1.5894dB, 2.3742dB, and -33.058dB with Tx(1805~1880 MHz), respectively. In the particular, the attenuations in 5MHz edge of band width were -9.1399dB and -14.336dB with Cellular Rx, -7.0343dB and -5.2943dB with Cellualr Tx, respectively. The attenuations of DCS Rx from the relative Tx were -58.298dB and -65.644dB, respectively. On the other hand, those of DCS Tx from the relative Rx were -70.659dB and -50.488dB, respectively. From the aboved results, the dielectric filters for Celluar and DCS band with Isolator showed the good skirt and ripple characterics.
Reflector Matching Mechanism for Localization of Automatic guidance system
Jung, Eun-Kook ; Jung, Kyung-Hoon ; Cho, Hyun-Hak ; Kim, Jung-Min ; Kim, Sung-Shin ;
Journal of the Korea Institute of Information and Communication Engineering, volume 15, issue 6, 2011, Pages 1238~1244
DOI : 10.6109/jkiice.2011.15.6.1238
This paper presents the matching method of reflectors for localization of laser navigation. The laser navigation is a device that measures distance and angle of reflector. The conventional major matching using the laser navigation is method that moves position of measured reflectors to position of installed reflectors and than rotate moved reflectors. However, it is difficult to use the industry because it has high computational complexity and high errors. To solve those problem, The proposed matching is method that create position of measured reflectors to assume that the position of installed reflectors is position of AGV and than rotate the position of installed reflectors. For experiment, we used AGV which was designed by ourselves, and compared positioning accuracy when AGV moves according to varying steering angle and driving speed.
A Study on the Development of Medical Service Robot
Kang, Sung-In ; Park, Yoon-A ; Oh, Am-Suk ;
Journal of the Korea Institute of Information and Communication Engineering, volume 15, issue 6, 2011, Pages 1245~1250
DOI : 10.6109/jkiice.2011.15.6.1245
In this paper, we designed efficient reception system using service robot based on the RFID(Radio Frequency Identification) and HL7(Health Level 7) Protocol. The proposed system offer a paramedic the medical information of the patient, and the patients can receive on a much simpler scale than previously through stable and quick information exchange by RFID and HL7. In addition, We considered environment of medical treatment and designed and implemented standard HL7 message structure. This system was implemented service robots to reception of medical treatment. Furthermore, we have plan to develop bio-sensor which can measure blood pressure, body temperature, etc and interface with robot system by HL7.
Path Search Method using Genetic Algorithm
Kim, Kwang-Baek ; Song, Doo-Heon ;
Journal of the Korea Institute of Information and Communication Engineering, volume 15, issue 6, 2011, Pages 1251~1255
DOI : 10.6109/jkiice.2011.15.6.1251
In this paper, we propose an optimal path search algorithm that contains all nodes using genetic algorithm. An object in this approach is formed as an equation related with the Euclidean distance between an intermediate node and the starting node and between an intermediate node and the goal node. Like other genetic algorithm structures, our algorithm defines a fitness function and selects a crossover spot node and a bitwise crossover point. A new node out of such operation survives only if it satisfies the fitness criteria and that node then becomes the starting node for the next generation. Repetition continues until no changes are made in the population. The efficiency of this proposed approach is verified in the experiment that it is better than two other contestants - sequential approach and the random approach.
Performance Analysis of Group Communication using VoIP in WiBro Networks
Kim, Myung-Kyun ; Eom, Yun-Sung ;
Journal of the Korea Institute of Information and Communication Engineering, volume 15, issue 6, 2011, Pages 1256~1264
DOI : 10.6109/jkiice.2011.15.6.1256
MBS (Multicast Broadcast Service) is defined in WiBro networks for implementing multicast-based services. However, most of the WiBro networks currently used in Korea do not have the MBS functionality and it causes some difficulty in implementing multicast-based services. This paper evaluates the performance of VoIP-based group communication services when implementing using the following two cases: unicast-based and multicast-based group communication systems. The performance evaluation is done using QualNet for each case in terms of the amount of network resource for the service, the delay and delay jitter of packets, and the difference of the delay of members in a group. The simulation result shows that the number of groups and members in a group in a WiBro network is limited because the amount of network resource for the service is increased according to the number of members in a group, and so, the MBS service is required in a WiBro network for a fully-fledged service of VoIP-based group communications. The simulation result also shows that, when a packet bundling is used, the number of groups and members in a group that can be supported in a WiBro network can be increased due to the decrease of the amount of network resource for the service.
Handoff Scheme based on User Service Profile between WLAN and Cellular Mobile System
Kwon, Soo-Kun ;
Journal of the Korea Institute of Information and Communication Engineering, volume 15, issue 6, 2011, Pages 1265~1270
DOI : 10.6109/jkiice.2011.15.6.1265
Different wireless technologies have been developed for various mobile applications. To offer seamless service in next mobile communication systems, it needs handoff service between heterogeneous mobile access networks. A high data rate handoff call from WLAN to cellular mobile network can increase rapidly the blocking probability of BS of cellular mobile network. To solve this problem, this paper proposes a new handoff scheme based on user service profiles. The performances of the proposed scheme are evaluated using computer simulations.
Development of Desktop Virtualization Using USB System
Cho, Hui-Kyoung ; Kim, Kun-Sub ; Jung, Hoe-Kyung ;
Journal of the Korea Institute of Information and Communication Engineering, volume 15, issue 6, 2011, Pages 1271~1276
DOI : 10.6109/jkiice.2011.15.6.1271
Recently, the emergence of various terminal devices increases desire for information exchanges. USB technology is the one of useful devices which is used for connection between them. Especially, it has been introduced some technologies that are able to convergence between UWB wireless technologies and USB transmission technologies. In this paper, we designed and implemented the way to extension virtually desktop computing environment by using USB transfer technology. It leads virtual desktop environment that was able to extend up to 8 units by using USB to VGA/HDMI adapter. And we can control quality of services and signal by USB transfer software.
A implementation of system which checks the vehicle oil identification and quantitative gas
Jeong, Da-Woon ; Baek, Sung-Hyun ; Jang, Jong-Wook ;
Journal of the Korea Institute of Information and Communication Engineering, volume 15, issue 6, 2011, Pages 1277~1282
DOI : 10.6109/jkiice.2011.15.6.1277
Recently, many car drivers were damaged by gas station which support similar oil product and not quantitative gas. It were expected to increase above-mentioned damages. By using similar oil products, caused damage are working of lubrication in the fuel line, elf-cleaning function, the part of the early deterioration, impure accumulation in the fuel line, toxicity material in exhaust emissions and unidentified chemical reaction. To prevent these damages, proposed system use in-vehicle state data with OBD-II protocol, measure quantitative gas and similar oil. In this paper, there have implemented similar oil identification and quantitative gas system through OBD-II scanner to provide WiFi communcation by using WinCe development Board.
Improvement of Sleep Quality Using Color Histogram
Shin, Seong-Yoon ; Shin, Kwang-Seong ; Rhee, Yamg-Won ;
Journal of the Korea Institute of Information and Communication Engineering, volume 15, issue 6, 2011, Pages 1283~1288
DOI : 10.6109/jkiice.2011.15.6.1283
In this paper we collect data concerning sleep environments in a bedroom and analyze the relationship between the collected condition data and sleep. In addition, this paper detects scene changes from the subjects in a sleeping state and presents the physical conditions, reactions during sleep, and physical sensations and stimuli. To detect scene changes in image sequences, we used color histogram for the difference between the preceding frame and the current frame. In addition, to extract the tossing and turning for different situations, the subjects were instructed to enter the level of fatigue, the level of drinking, and the level of stomach emptiness. For the sleep experiment system, we used the H-MOTE2420 Sensor composed of temperature, humidity, and light sensors. This paper is intended to provide the best sleep environment that enhances sleep quality, thus inducing people today to get regular and comfortable sleep.
SAF: A Scheme of Swap Space Allocation in File Systems to Reduce Disk Seek Time
Ahn, Woo-Hyun ; Kim, Bo-Gon ; Kim, Byung-Gyu ; Oh, Jae-Won ;
Journal of the Korea Institute of Information and Communication Engineering, volume 15, issue 6, 2011, Pages 1289~1300
DOI : 10.6109/jkiice.2011.15.6.1289
In recent computer systems with high-performance, users execute programs needing large memory and programs intensively accessing files simultaneously. Such a large memory requirement makes virtual memory systems access swap spaces in disk, and intensive file accesses require file systems to access file system partitions in disk. Executing the two kinds of programs at once incurs large disk seeks between swap spaces and file system partitions frequently. To solve the problem, this paper proposes a new scheme called SAF to create several swap spaces in a file system partition, where pages to be paged out are stored. When a page is paged out, the scheme stores the page to one of the swap spaces close to a disk location where the most recently accessed file is located. The chosen swap space in the file system partition is closer to the disk location than the traditional swap space, so that our scheme can reduce the large disk seek time spent to move to the traditional swap space in paging out a page. The experiment of our scheme implemented in FreeBSD 6.2 shows that SAF reduces the execution time of several benchmarks over FreeBSD ranging from 14% to 42%.
Design of Lightweight RTOS for MCU
Bak, Chang-Gyu ;
Journal of the Korea Institute of Information and Communication Engineering, volume 15, issue 6, 2011, Pages 1301~1306
DOI : 10.6109/jkiice.2011.15.6.1301
RTOS in the embedded system is a powerful tool for the design of multi-tasking. However, previous RTOS has large proportion in the MCU with limited memory. So it is difficult to apply RTOS. In this paper, I removed less frequently used features from the traditional RTOS, and designed lightweight RTOS that schedules and manages the resources with minimal code. I used techniques to obtain user memory using sharing stack, and to reduce the overhead at context. Considering ratio of kernel and applications, the RTOS designed in this paper is available on the MCU with more than 4KB of program memory.
Technique for Enhancing Security and Analyses of Vulnerability of RFID Tag security and Protocol
Kim, Jung-Tae ;
Journal of the Korea Institute of Information and Communication Engineering, volume 15, issue 6, 2011, Pages 1307~1312
DOI : 10.6109/jkiice.2011.15.6.1307
Radio Frequency Identification(RFID) has been considered as an key infrastructure for the ubiquitous society. However, due to the inherent drawbacks, RFID causes var- ious security threats like privacy problems, tag cloning, etc. This paper proposes a novel practical approach, which are fully conformed to EPCglobal RFID Gen2 standard, for enhancing security of currently used RFID Gen2 tags against the various security threats.
A Study of Eavesdropping and Attack about Smart Phone VoIP Services
Chun, Woo-Sung ; Park, Dea-Woo ; Yang, Jong-Han ;
Journal of the Korea Institute of Information and Communication Engineering, volume 15, issue 6, 2011, Pages 1313~1319
DOI : 10.6109/jkiice.2011.15.6.1313
VoIP service by taking advantage of the current PSTN network and internet over the existing telephone network at an affordable price allows you to make voice calls to the service is being expanded. However, the security of public must be maintained for security vulnerabilities in Smart Phone VoIP case problems arise, and is likely to be attacked by hackers. In this paper, the Internet, using wired and Smart Phone VoIP services may occur during analysis of the type of incident and vulnerability analysis, the eavesdropping should conduct an attack. Smart Phone VoIP with institutional administration to analyze the vulnerability OmniPeek, AirPcap the equipment is installed in a lab environment to conduct eavesdropping attack. Packet according to the analysis and eavesdropping attacks, IP confirmed that the incident as an attack by the eavesdropping as to become the test proves. In this paper, as well as Smart Phone VoIP users, the current administration and the introduction of Smart Phone service and VoIP service as a basis for enhanced security will be provided.
A Study on Cloud Network and Security System Analysis for Enhanced Security of Legislative Authority
Nam, Won-Hee ; Park, Dea-Woo ;
Journal of the Korea Institute of Information and Communication Engineering, volume 15, issue 6, 2011, Pages 1320~1326
DOI : 10.6109/jkiice.2011.15.6.1320
National institutions on the importance of information security is being recognized, information security laws are being discussed in Congress 3.4 DDoS incident and Nonghyup hacking, etc. However, National Assembly Secretariat when the results of the Information Security Consulting has been assessed very low 61.2 points, evaluation of hardware and software in secure areas were vulnerable. This paper, the legislative support agencies National Assembly and National Assembly Secretariat on the network and computer systems, and managerial, technical and physical security elements are analyzed for the status. And network should have the legislative support agencies and system for the physical network separation, DDoS attack response, Virus attack response, hacking attacks response, and Cyber Emergency Response Team/Coordination Center for Cyber infringing design and research through the confidentiality, integrity, availability, access control, authentication and security analysis is based on the evaluation criteria. Through this study, the legislative support agencies to strengthen the security of data and security laws enacted to provide the basis for.
The Design of Sensor System for Scalable Mobile Meteorological Information Services
Choi, Jin-Oh ;
Journal of the Korea Institute of Information and Communication Engineering, volume 15, issue 6, 2011, Pages 1327~1332
DOI : 10.6109/jkiice.2011.15.6.1327
In the mobile meteorological information services, an existing sensor system should be expanded to serve precise information. This is because of large cost problem to add the existing sensors. This thesis proposes a system architecture to construct scalable mobile meteorological information services and suggests mobile phone, sensor network, and public traffic vehicle as expended sensors. The proposed scalable sensors are compared each other and analysed the results to evaluated their strength and weakness. In this system, based on the characteristics of the sense data collected at server, a data processing methods are proposed to support efficient query processing. The proposing data processing methods have several benefits. They compress some data volume sensed by various sources on some area at some time to a logical unit. Still it could preserve same services quality.
A 3D Game Character Design Using MAYA
Ryu, Chang-Su ; Hur, Chang-Wu ;
Journal of the Korea Institute of Information and Communication Engineering, volume 15, issue 6, 2011, Pages 1333~1337
DOI : 10.6109/jkiice.2011.15.6.1333
3D engines loading, and expansion of the usable capacity, next-generation smartphone game markets are rising briskly by the improvement in CPU processing speed of Phones (hardware of smartphone). Therefore, in creating 3D game characters, realistic and free-form animations in a small screen of a smartphone are becoming important. Through this paper, as a method of creating characters and operating for game characters to cause user`s feeling, with NURBS data of MAYA, We completed a face in turns of eyes, a nose, and a mouth, and with Polygon Cube tool, modeled hands and feet. After dividing a cube into half and modeling it, through mirror copying We completed the whole body and modeled the low-polygon. Then to model realistic and free-form characters, We completed each detail with ZBrush and applied Divide level up to 4. Though they might look rough and exaggerated, We tried to express stuck-out parts and fallen-in parts effectively and smoothly with Smooth brush effect, map and design the low-polygon 3D characters.
Analysis of Channel Doping Profile Dependent Threshold Voltage Characteristics for Double Gate MOSFET
Jung, Hak-Kee ; Han, Ji-Hyung ; Lee, Jae-Hyung ; Jeong, Dong-Soo ; Lee, Jong-In ; Kwon, Oh-Shin ;
Journal of the Korea Institute of Information and Communication Engineering, volume 15, issue 6, 2011, Pages 1338~1342
DOI : 10.6109/jkiice.2011.15.6.1338
In this paper, threshold voltage characteristics have been analyzed as one of short channel effects occurred in double gate(DG)MOSFET to be next-generation devices. The Gaussian function to be nearly experimental distribution has been used as carrier distribution to solve Poisson`s equation, and threshold voltage has been investigated according to projected range and standard projected deviation, variables of Gaussian function. The analytical potential distribution model has been derived from Poisson`s equation, and threshold voltage has been obtained from this model. Since threshold voltage has been defined as gate voltage when surface potential is twice of Fermi potential, threshold voltage has been derived from analytical model of surface potential. Those results of this potential model are compared with those of numerical simulation to verify this model. As a result, since potential model presented in this paper is good agreement with numerical model, the threshold voltage characteristics have been considered according to the doping profile of DGMOSFET.
Low Power Detection Circuit for a Capacitive Fingerprint Sensor
Jung, Seung-Min ;
Journal of the Korea Institute of Information and Communication Engineering, volume 15, issue 6, 2011, Pages 1343~1348
DOI : 10.6109/jkiice.2011.15.6.1343
A modified capacitive detection circuit of charge sharing scheme is proposed, which reduces the static power dissipation and increases the voltage difference between a ridge and valley more than a conventional circuit. The detection circuit is designed and simulated in 3.3V,
standard CMOS process, 40MHz condition. The result shows about 47% power dissipation reduction and 90% improvement of difference between a ridge and valley sensing voltage. The proposed circuit is layout without area increasing of a one pixel.
A study on the capacitance-voltage characteristics of the CdZnS/CdTe heterojunction
Lee, Jae-Hyeong ;
Journal of the Korea Institute of Information and Communication Engineering, volume 15, issue 6, 2011, Pages 1349~1354
DOI : 10.6109/jkiice.2011.15.6.1349
In this work, we fabricated the CdZnS/CdTe heterojunction and investigated the C-V characteristics to determine the depletion width and the charge density distribution. A parallel experiment on CdS/CdTe heterojunction was also carried out for comparison. The depletion region width, for CdZnS/CdTe heterojunction, was nearly constant, regardless of bias voltage. However, the depletion region was wider than that of CdS/CdTe heterojunction due to high resistivity of CdZnS film. The interface charge density of CdZnS/CdTe heterojunction was increased linearly with the bias voltage and showed lower values than those for CdS/CdTe junction. The open circuit voltage of CdZnS/CdTe heterojunction solar cells increased with zinc mole ratio due to reducing of the electron affinity difference between CdZnS and CdTe films. However, the increase of series resistance due to the high resistivity of Cd1-xZnxS films results in reducing conversion efficiency.
A LDPC decoder supporting multiple block lengths and code rates of IEEE 802.11n
Na, Young-Heon ; Park, Hae-Won ; Shin, Kyung-Wook ;
Journal of the Korea Institute of Information and Communication Engineering, volume 15, issue 6, 2011, Pages 1355~1362
DOI : 10.6109/jkiice.2011.15.6.1355
This paper describes a multi-mode LDPC decoder which supports three block lengths(648, 1296, 1944) and four code rates(1/2, 2/3, 3/4, 5/6) of IEEE 802.11n WLAN standard. Our LDPC decoder adopts a block-serial architecture based on min-sum algorithm and layered decoding scheme. A novel way to store check-node values and parity check matrix reduces the sizes of check-node memory and H-ROM. An efficient scheme for check-node memory addressing is used to achieve stall-free read/write operations. The designed LDPC decoder is verified by FPGA implementation, and synthesized with a
CMOS cell library. It has 219,100 gates and 45,036 bits RAM, and the estimated throughput is about 164~212 Mbps at 50 MHz@2.5v.
Granular noise analysis in pixel-to-pixel mapping-based computational integral imaging
Yoo, Hoon ;
Journal of the Korea Institute of Information and Communication Engineering, volume 15, issue 6, 2011, Pages 1363~1368
DOI : 10.6109/jkiice.2011.15.6.1363
This paper describes an analysis on the granular noise in pixel-to-pixel mapping-based computational integral imaging. The pixel mapping-based method provides a high-resolution reconstructed images and also its computational cost is very lower than the previous back-projection-based method. In this paper, a signal model for the pixel mapping-based method is introduced, which defines and analyzes the granular noise. Computer experiments provides the granular noise properties based on the proposed signal model. The experimental results indicates that the granular noise pattern differs from that of the back-projection based method. The results is also utilized in the pixel mapping-based method.
Android-Based Synchronous Mobile Distance Learning System with Session Recording and Replay Support
Sung, Dae-Hyun ; Lee, Jang-Ho ;
Journal of the Korea Institute of Information and Communication Engineering, volume 15, issue 6, 2011, Pages 1369~1380
DOI : 10.6109/jkiice.2011.15.6.1369
Most existing mobile distance learning systems are asynchronous ones that allow students to download lecture video and presentation material. However, there are a few synchronous real-time mobile distance learning systems that support slide, annotation, feedback from student, and lecture video and audio at the same time. These live mobile distance learning systems have an advantage of supporting real-time interaction between students and a lecturer thereby making students understand the lecture better. But, they also have a disadvantage in the sense that they don`t allow students to experience the past lecture. This problem can be solved by recording and replaying lecture session. So far, there are few mobile distance learning systems that support session recording and replay. This paper presents a synchronous mobile distance learning system that supports video and audio, slide with annotation, and real-time feedback from students, as well as session recording and replay, which is not supported by the existing mobile distance learning systems. The evaluation of the system among students shows that 61.3% of them were satisfied while 3.2% weren`t.
Change the structure of VCM Actuator AUTO Focusing the camera module performance optimization through
Kwon, Tae-kwon ; Kim, Young-Kil ;
Journal of the Korea Institute of Information and Communication Engineering, volume 15, issue 6, 2011, Pages 1381~1385
DOI : 10.6109/jkiice.2011.15.6.1381
Hand-phone in the recently released high-end applied to the Camera Module is equipped with the most features Auto Focusing Camera Module and much greater importance of the pixel count is much more precise and reliable AF-powered products are being demanded by consumers. This paper is available now apply the Camera Module VCM (Actuator) for Auto Focusing Lens focal point of the problem location and resolution of positional deviation occurs Module Warranty and stable resolution of the improved structure for Actuator Drive Change the structure VCM is proposed
Backoff Algorithm to improve DCF functionality in IEEE 802.11
Nam, Jae-Hyun ;
Journal of the Korea Institute of Information and Communication Engineering, volume 15, issue 6, 2011, Pages 1386~1390
DOI : 10.6109/jkiice.2011.15.6.1386
The IEEE 802.11 MAC uses DCF for media access among the participating network nodes. But DCF alone is neither capable nor suitable for fulfilling the QoS requirements of realtime applications. There are many ways in which QoS is provided by modifying DCF based MAC. This paper proposes (m,k)-collision scheme which is based on IEEE 802.11 and (m,k)-firm scheme tries to improve DCF functionality. The proposed scheme uses different Contention Window according to the number of collision in the node. The simulation result shows that the proposed scheme helps improve the throughput of the DCF.
u-IT Based Plant Green Growth Environment Management System
Kim, Jong-Chan ; Cho, Seung-Il ; Ban, Kyeong-Jin ; Kim, Chee-Yong ;
Journal of the Korea Institute of Information and Communication Engineering, volume 15, issue 6, 2011, Pages 1391~1396
DOI : 10.6109/jkiice.2011.15.6.1391
A way to increase productivity in agriculture that is labor-centered industry is to graft IT technology. Today, many technologies in ubiquitous computing are deployed in all areas of society such as traffic control, automotive manufacturing, construction, defence, healthcare and clinical services. These IT technologies is gaining more attention as a fusion technology among traditional industries. To successfully build ubiquitous agriculture environment, it needs optimized core technology development for agriculture that includes sensor node H/W, middleware platform, routing protocol and agriculture environment application services. To achieve accurate botany growth environment management, we propose a green growth environment management system using environmental factor monitoring sensor and biological information sensors in greenhouse. By using our proposed system, it is expected to realize fusion complex agriculture technology with low cost.
A Study on Manufacturing of Sample Holder for the EM Property Analysis in W-band
Choi, Chang-Mook ;
Journal of the Korea Institute of Information and Communication Engineering, volume 15, issue 6, 2011, Pages 1397~1403
DOI : 10.6109/jkiice.2011.15.6.1397
In this paper, fabrication of sample holder was studied for an analysis of electromagnetic(EM) wave property in W-band(75 GHz~110 GHz). First of all, a propagation theory of EM wave was considered in the rectangular waveguide, and measurement technique was suggested for analysis of characteristics. A sample holder using in W-band was designed and fabricated, and used for analysis of material property and absorption ability using RAM samples. As a result, the sample holder test was verified exactly for measuring EM wave property of RAM sample. In the future, the proposed sample holder would like to be used for the EM wave property analysis in W-band.