• Journal of the Korea Institute of Information and Communication Engineering
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• v.18 no.12
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• pp.3029-3034
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• 2014

The paper describes the scleral diagnostic system implementation for human eyes by using the scleral color code and vessels sign pattern code generations. The system is based on the high performance DSP image signal processor, programmable gain control for preprocessing and RISC SD frames storage. RGB image signals are optimized by PGC, the edge image is detected form the gray image converted. The processing algorithms are executed by scleral color code generation and scleral vessels sign pattern code creation for discriminating and matching. The scleral symptomatic color code is generated by YCbCr values at memory map tolerated and the vessel sign pattern code is created by digitizing the 24 clock and 13 ring zones, overlay matching and tolerances. The experimental results for performance are that the system runs 40ms, and the color and pattern for diagnostic errors are around 20% and 24% on average. The system and technique enable a scleral diagnosis with subdividing the patterns and patient database.

• Journal of KIISE:Computing Practices and Letters
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• v.10 no.1
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• pp.114-124
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• 2004

In this paper, we present an automatic C source code generation system for DirectShow based multimedia application programming. In this system, C source code is automatically synthesized from the filter connection graph edited with GraphEdit, a utility tool provided with DirectShow SDK package from Microsoft. In traditional DirectShow programming environments, program design and brief testing steps are usually done with GraphEdit tool just by inserting filters and connecting them properly, while actual implementation of the program should be done separately. The filter connection graph information from GraphEdit is used just as a reference in such the implementation step. Therefore, our system which automatically generates C source code directly from the filter connection graph of GraphEdit seems very useful and many programmers can develop DirectShow based multimedia application programs more effectively and quickly using our system. In addition, our system supports more various media stream control functions for the generated application programs than the existing system such as Wizard which supports limited and fixed number of media control functions only. This feature allows more flexibility in the user interface of the generated source program and makes our system more practical for DirectShow based programming.

• Proceedings of the Korean Information Science Society Conference
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• 2000.10a
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• pp.617-619
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• 2000

본 논문에서는 일반 사용자 수준에서 시스템 호출을 제어하는 기법을 제안하고 이를 위한 유닉스 기반 시스템에서 시스템 호출을 인터럽트 하는 기법을 기술한다. 제안된 방법은 OS 소스코드의 수정을 요구하지 않고 동적으로 적용이 가능하다. 또한 시스템 호출 제어기법의 응용으로 사용자의 시스템 자원 접근 및 권한을 제어하는 보안모델인 UPS (Unix Protection System)에 대하여 기술한다.

• Proceedings of the Korean Reliability Society Conference
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• 2000.04a
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• pp.247-253
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• 2000

본 논문은 정보 여분(Information Redundancy)에서의 에러 검출 코딩(Error Detect Coding) 기법을 이용하여 3-out-of-6 자체 검사기를 설계하고, 주기적인 코드(Frequency Coding) 주입을 통해 고장-안전 제어 논리를 모델링 했다. 고장-안전 제어 논리 모듈과 TMR(Triple Modular Redundancy)의 단일 모듈간에 대해서 신뢰성 병렬 수치 해석을 수행하였고, 이때 고장-안전 제어 논리가 기존의 하드웨어 여분 기법보다 시스템 소모비용과 기능적 오버헤드가 감소되어 기능신뢰성이 증가되는 결과를 얻었다.

• Proceedings of the KIEE Conference
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• 2000.07d
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• pp.2519-2521
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• 2000

브러시리스용 다기능 제어구동장치를 80C196KC 콘터롤러와 IPM으로 단순화하여 개발하여 기존의 TTL 소자 구성에 비하여 하드웨어를 가장 단순화시키고 표준화제품의 개발을 유도하였다. 대신에 대부분의 기능을 소프트웨어로 처리함으로써 설계의 융통성과 확장성을 높이고 고성능 저가격의 제품을 개발할 수 있었다. 특히, 속도 센서로 자극검출에 필요한 홀센서를 이용함으로써 기존 엔코드 센서에 비하여 속도 분해능은 다소 떨어지지만 이 센서를 없앨 수 있어 제품가격을 낮추고, 크기를 줄일 수 있는 장점을 갖는다. 제어 구동장치의 성능시험을 통하여 개발결과를 검증하였으며, 고정밀 속도제어를 실현할 수 있음을 확인하였다.

• Proceedings of the Korea Information Processing Society Conference
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• 2000.04a
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• pp.214-219
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• 2000

본 논문에서는 사용자 수준에서 시스템 호출을 제어하는 방법 및 구성을 제안하고, 이를 위해 유닉스 시스템 호출을 가로채는 방법을 기술한다. 제안된 방법은 유닉스의 소스 코드의 수정을 필요로 하지 않으므로, 동적으로 적용 및 변경이 가능하다. 또한, 시스템 호출 제어방법의 응용 모델로서, 사용자의 시스템 자원 접근을 제어하는 보안 모델로 설계된 UPS(Unix Protection System)에 대하여 기술한다. UPS의 성능 평가는 벤치마크 프로그램들의 수행을 통해 추가 부하(overhead)를 살펴본다. 실험 결과에 의하면 UPS를 사용한 경우는 사용하지 않은 경우보다 1$\sim$19%의 추가적인 시간이 소요되었다.

• Proceedings of the Korean Nuclear Society Conference
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• 1996.05a
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• pp.117-124
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• 1996

원전의 상용 부하추종운전 능력을 위한 노심 제어기법인 Mode K를 개발하고, 이를 차세대원전의 제1주기 주기초에 적용하여 일일 부하추종운전을 수행할 때의 노심 거동을 ONED94 전산코드로 모사 계산하였다. 계산 결과, 단순하면서도 유연한 형태의 붕산 농도 변화를 수용하면서 제어봉으로 출력분포 및 반응도를 동시에 제어하는 Mode K 제어 논리가 잘 작동하였으며, PbXb운전에 비하여 액체 폐기물 생성량이 30%까지 감소하였다.

• Journal of the Institute of Electronics Engineers of Korea SP
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• v.37 no.3
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• pp.1-10
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• 2000

This paper proposes a novel video coding system with rate control based on fractal algorithm To overcome the demerits of excessive amounts of coded bit generated by previous fractal coding methodology. the proposed system classifies the Image into three classes such as background, motion compensation, and fractal coding area. The motion vector for motion compensation, and the fractal offset value that is difference value between the predicted offset and the least-square approximated value are coded with variable length code The decision method which determines threshold value of partitioning quadtree is applied to the bit-rate control algorithm considering the quantity of currently generated bits and fixed channel bandwidth Experimental result shows that the proposed system enhances compression ratio 1.8 times higher than previous method for the same image quality, and performs efficient rate control for fixed channel bandwidth.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.29 no.10C
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• pp.1433-1443
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• 2004

The power line modem proposed in this paper transmits the remote control signal using CSK(Code Shift Keying) and DS/SS method. The CSK technique provides the increased capacity of transmission and robustness towards noise. Besides, the DS/SS technique provides protection against narrow-band Gaussian interference and multi-path interference. The modem supports full-duplex communication using FDD(Frequency Division Duplex) and the modem structure for forward link is same with that for reverse link. To switch each sub-controlled unit smoothly, 4/$\pi$-DQPSK is adopted for noncoherent demodulation. The PN code for spreading spectrum seues to divide each group which consists of sub-controlled units and Walsh code is used for the M-ary CSK technique. Each block is designed and verified with TMS320C5402 DSP. We show the superiority of the proposed method by analyzing numerically the system performance for the factors of the DS/SS and CSK method ullder additive white Gaussian noise and PBI.

• Journal of the Korean Institute of Intelligent Systems
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• v.8 no.5
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• pp.83-97
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• 1998

This paper developes an integrated environment CAD system that can design and implement an accurate and cost-effective FLC automatically. For doing this, an integrated development environment (IDE) (called FADIS; FLC Automatic Design and Implementation Station) is built by the seemless coupling of many existing. CAD tools in an attempt to the FADIS performs various functions such that (1) i~utomatically generate the VHDL components appropriate for the proposed FLC architecture from the various design parameters (2) simulate the generated VHDL code on the Synopsys's VHDL Simulator, (3) automatically compiler, (4) generate the optimized, placed, and routed rawbit files from the synthesized modules by Xilinx's XactStep 6.0, (5) translate the rawbit files into the downloadable ex- [:cution reconfigurable FPGA board (VCC's EVCI), and (7) continuously monitor the control status graphically by communicating the FLC with the controlled target via S-bus. The developed FADIS is tested for its validity by carrying out the overall procedures of designing and implementing the FLC required for the truck-backer upper control, the reduction of control execution time due to the controller's FPGA implementation is verified by comparing with other implementations.