- Semi Annual
- Education ＞ Vocational and technical education
Kim Ki Young;Oh Whi-Vin;Lee Yong-Hwan;Rhee Sang-Burm;Lee June-Hwan 5
본 논문에서는 wavelet을 이용한 워터마크 삽입 시스템 구현을 제안한다. wavelet 변환 기법은 JPEG2000 이나 MPEG-4와 같은 차세대 데이터 압축 표준의 기본적 연산으로서 DCT연산에 비해 주파수 해상도와 시간해상도를 모두 만족시킨다. 제안한 시스템은 크게 DWT 변환모듈, 워터마크 삽입모듈, IDWT 복원모듈, Main Controller모듈로 구성된다. DWT 변환모듈은 Haar 웨이블렛 변환알고리즘을 기반으로 설계 됐으며 1차 신축을 통해 변환된 주파수 영역에서 중간주파수 대역(LH 및 HL)을 선택하여 워터마크를 삽입하는 워터마크 삽입 모듈, IDWT를 이용 신호를 복원하는 모듈, 전체시스템 구성 블록을 제어하는 Main Controller모듈로 구성된다.
Han TaeKyu;Oh Whi-Vin;Lee Yong-Hwan;Lee June-Hwan;Rhee Sang-Burm 11
In this thesis, we talk about 'Example of Building Alert System by Radio Packet Modem and Radio Tranceiver' faster than CDMA method in Wireless Communication. Moreover this type of System is enough to be economic. we show example of building Alert System by using this method.
Hwang June;Nahm EuiSeok;Min Byungjo;Kim Hagbae 17
The surge of Internet traffic makes the bottleneck nowadays. This problem can be reduced by substituting the media of network, routers and switches with more high-performance goods. However, we focused radically the server performance of processing the service requests. We prepose the method improving performance of server in the Linux kernel stack. This accelerator accepts the requests from many clients, and processes them using not user threads but kernel thread. To do so, we can reduce the overhead caused by frequent calling of system calls and the overhead of context switching between threads. Furthermore, we implement CPN(Coloured Petri Net) model. By using the CPN model criteria, we can analyze the characteristics of operation times in addition to the reachability of system. Benchmark of the system proves the model is valid.
Kwon Jinhyuck;Nam Eui Seok;Ahn Sangtae;Kim Hagbae 25
In the paper, the Management Server (MS) is designed and developed in order to overcome 1 imitations in the Residential Gateway (RG). The Proposed MS is composed of the Network Management System(NMS), Home Automation System(HAS), Persistent Data Management(PDM). The developed MS is a dedicated server which manages both individual RG and internet home appliances implemented at a home-network environments.
A Realtime Report Generation Model using Mterialized View Management Technique Based on Database TriggerChoi Mi Ran;Jeon Keun Hwan;Hyun Deuk-chang;Shin Ye Ho 33
Reports have a significant meaning in time-constrained large transaction environments, such as airplane control systems or wargame simulations. This is due to the necessity of generating reports within a limited scope of time without restraining the operation performance of large transaction environments. In order to generate reports in large transaction environments while satisfying time - constrained requirements, this paper propose a model which combines the incremental operation mechanism and materialized view mechanism using triggers and stored procedures. Further, the implementation and evaluation of the preposed model provides analysis for model characteristics.
Ye Chul-Soo;Chung Hun-Suk;Kim Seong-Jong;Hyun Deuk-Chang 39
This paper presents an algorithm for acquisition of linear segments of building from edge pixels using Kalman filtering. We can obtain the accurate position of building corners from the linear segments of building. The corner points are used to calculate the position of building corners in world coordinate using stereo vision technique. The algorithm has been applied to pairs of stereo aerial images and the result showed accurate linear segment detection from edge pixels of roof boundaries.
Voltage-Current-luminance Characteristics of Organic : Light-Emitting Diodes depending on Hole-Injection Buffer LayerJeong Joon;Kim Tag-Yong;Ko Keel-Young;Lee Deok-Jin;Hong Jin-Woong 49
In this work, we have seen the effect of hole-transporting layer in organic light-emitting diodes using N,N'-biphenyl-N,N'-bis-(3-methylphenyl)-[1,1'-biphenyl]-4,4'-diamine(TPD) and N,N'-biphenyl-N,N'-bis-(1-naphenyl)-[1,1'-biphenyl]-4,4'-diamine(NPB). NPB is regarded as a better hole trans porting material than TPD, since it has a higher glass transition temperature
$(T_g)$. And current -voltage, luminance-voltage and external quantum efficiency of device were measured with the thickness variation of buffer layer using copper phathalocyanine(CuPc) and polytetrafluoroethylene (PTFE) at room temperature. We have obtained an improvement of External quantum efficiency when the CuPc 30[nm] and PTFE 1.0[nm] is used.
Kim T. Y.;Shin J. Y.;Lee J. H.;Lee D. J.;Hong J. H. 55
Stability of inside power equipments are required for electron equipment in order to operate those safely. Also, the power circuits for these have been developing, but research of dielectric strength of power supply is insufficient. In this paper, for test insulation condition variation by void it is tested insulation characteristics variation, using
$\phi-q-n$distribution variation in partial discharge test.
A Study on artifact extraction in magnetocardiography using multilayer neural network and principal component analysisLee D. H.;Kim T. Y.;Lee D. J. 59
Principal component analysis(PCA) and neural network(NN) are used in reducing external noise in magnetocadiography. The PCA technique turns out to be very effective in reducing pulse noise in some SQUID channels and the NN find noise component automatically. Some experimental results obtained from 61 channel MCG system are shown.
Park, Yun-Sik;Sung, Man-Young;Kang, Ey-Goo 67
In this paper, propose a new structure of MOFET(Metal-Oxide-Semiconductor Field Effect Transistor) which is widely application for semiconductor technologies. Eleminate the latch-up effect caused by closed devices when conpose a electronic circuit using proposed devices. In this device have a completely isolation structure, and advantage of leakage current elimination. Each independent devices are isolated by trench-well and oxide layer of SOI substrate. Using trench gate and self aligned techniques reduces parasitic capacitance between gate and source, drain. In this paper, we proposed the new structure of SOI MOSFET which has completely isolation and contains trench gate electrodes and SOI wafers. It is simulated by MEDICI that is device simulator.
Kim, Dae-Won;Kim, Dae-Jong;Sung, Man-Young;Kang, Ey-Goo;Lee, Dong-Hee 71
A vertical trench electrode type EST has been proposed in this paper. The proposed device considerably improve the snap-back effect which leads to a lot of problem of device applications. In this paper, the vertical dual gate Emitter Switched Thyristor(EST) with trench electrode has been proposed for improving snap-back effect. It is observed that the forward blocking voltage of the proposed device is 800V. The conventional EST of the same size were no more than 633V. Because the proposed device was constructed of trench-type electrode, the electric field moved toward trench-oxide layer, and the punch through breakdown of the proposed EST is occurred at latest.
Kim, Jae-Wook;Kang, Ey-Goo;Sung, Man-Young 75
An ideal semiconductor memory technology would combine or unify the attractive features of these technologies without acquiring any of the unattractive features. Such a memory technology, Phase Change RAM is now being developed using the class of elements known as chalcogenides. It is expected that this technology will eventually allow chips that have SRAM speed, DRAM cost, and Flash power characteristics and non-volatility.
Kim, Je-Yoon;Kim, Jae-Wook;Sung, Man-Young 79
The electrothermal simulation of high voltage LIGBT(Lateral Insulated Gate Bipolar Transistor) in thin Silicon on insulator (SOI) and Silicon on sapphire (SOS) for thermal conductivity and sink is performed by means of MEDICI. The finite element simulations demonstrate that the thermal conductivity of the buried oxide is an important parameter for the modeling of the thermal behavior of silicon-on-insulator (SOI) devices. In this paper, using for SOI LIGBT, we simulated electrothermal for device that insulator layer with
$SiO_2$and $Al_2O_3$at before and after latch up to measured the thermal conductivity and temperature distribution of whole device and verified that SOI LIGBT with $Al_2O_3$insulator had good thermal conductivity and reliability.
Ye Chul-Soo;Chung Hun-Suk;Kim Seong-Jong;Hyun Deuk-Chang 87
Anisotropic diffusion is a selective smoothing technique that promotes smoothing within a region instead of smoothing across boundaries. In anisotropic diffusion, the rate of smoothing is controlled by the local value of the diffusion coefficient chosen to be a function of the local image gradient magnitude. El-Fallah and Gary E. Ford represented the image as a surface and proved that setting the inhomogeneous diffusion coefficient equal to the inverse of the magnitude of the surface normal results in surface evolving speed that is proportional to the mean curvature of the image surface. This model has the advantage of having the mean curvature diffusion (MCD) render invariant magnitude, thereby preserving structure and locality. In this paper, the proposed MCD model efficiently reduces diffusion coefficient at the thin edges using the smoothness of the surface.
Kim, Dae-Jong;Sung, Man-Young;Kang, Ey-Goo 95
Power semiconductors are being currently used as a application of intelligent power inverters to a refrigerator, a washing machine and a vacuum cleaner as well as core parts of industrial system. The rating of semiconductor devices is an important factor in decision on the field of application and the forward blocking voltage is one of factors in decision of the rating. The Power MOS device has a merit of high input impedance, short switching time, and stability in temperature as well known. Power MOS devices are mainly used as switches in the field of power electronics, especially the on-state resistance and breakdown voltage are regarded as the most important parameters. Power MOS devices that enable a small size, a light weight, high-integration and relatively high voltage are required these days. In this paper, we proposed the new lateral power MOS which has forward blocking voltage of 250V and contains trench electrodes and verified manufactural possibility by using TSUPREM-4 that is process simulator.
Lee D. H.;Chang K. S.;Kim K. T. 99
Data acquisition of biomedical signal is important that can convert health of human body to measurable datas. In this paper, we developed system that can send multiple ECG data, ECG signal in biomedical signals, using Bluetooth wireless transmission. Developed system has several features, total gain of 1000, filtering data for noise reduction in hardware / software parts, portable to carry cause it has small size and battery operation. And system was designed which can measures data in several OS(Windows 2000, Windows CE).
A Study on the Strategic Plans for the Development of Specialized Information Center in Science & TechnologyKim Sang-Kuk;Lee Young-Sei;Shin Sung-Ho;Kim Tae-Jung;Lee Jae-Kwang 105
Number of information users of industry, school and research institute with arrival of knowledge information society are in trend that increase gradually the 21th century. Manufacture user number of database been circulating is examined to fourteen million, six hundred and twenty-four thousand people in internal until end of 2002 if follow to Korea data base promotion center, this shows increase more than yearly mean
$70\%$every year by increasing provision $70.3\%$past years. That collect rapidly and analyze connection importance information of scientific technique field in this hard fact and offer efficiently timely to investigator processing can say as indispensable indispensability a element in country science technique elevation. Wish to illuminate Specialized Information Center of scientific technique field's role and significance in this hard fact in this research, and examine the role and significance. Together, wish to present way for research direction and Specialized Information Center development by introducing phase thesis and synthetic middle, effort of Korea Institute of Science and Technology Information(KISTI) for special skill development way preparation and study finding for each Specialized Information Center.
Hwang Young-Chul;Choi Byung-Sun;Lee Seong-Hyun;Lee Won-Goo;Lee Jae-Kwang 111
Java Card API written to optimize Execute Environment in embedded device of small memory such as smart card. Java Card API intended to provide many advance when develope smart card based program. this paper purpose to implement RSA Algorithm of public key Algorithms with Java Card API.
Choi Byung-Sun;Hwang Young-Chul;Lee Seong-Hyun;Lee Won-Goo;Lee Jae-Kwang 119
Computer simulation has used to a area of military training from about several years ago. War game model(or computer simulation) endow a military man with field training such as combat experience without operating combat strength or capabilities. To samely construct simulation environment against actual combat environment is to well construct DB to operate war game model, associate among federates on network. Thus, we construct virtual combat environment enabling to efficiently manage network traffic among federates(or active nodes) on active network that construct virtual military training space such as urgent combat field needed to rapidly transfer combat information including image and video.
Jeon, Keun-Hwan;Shin, Ye-Ho 127
The data models which express all types of video information physically and logically. and the definition of spatiotemporal relationship of video data objects In This paper, we classifies meta-model for efficient management on spatiotemporal relationship between two objects in video image data, suggests meta-models based on Rambaugh's OMT technique, and expanded user model to apply the adaptive model, established from hyper-media or web agent to VOD. The proposed meta-model uses data's special physical feature: the effects of camera's and editing effects of shot, and 17 spatial relations on Allen's 13 temporal relations, topology and direction to include logical presentation of spatiotemporal relation for possible spatiotemporal reference and having unspecified applied mediocrity.