• Proceedings of the Korea Information Processing Society Conference
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• 2013.11a
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• pp.1532-1535
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• 2013

변환 블록은 영상 압축에서 데이터를 공간적 영역에서 주파수 영역으로 변환해줌으로써 압축의 효율성을 높이는 역할을 수행한다. 본 논문에서는 고성능 HEVC를 위한 4개의 TU 모드($4{\times}4$, $8{\times}8$, $16{\times}16$, $32{\times}32$)를 지원하는 변환 블록 하드웨어 구조를 제안한다. 제안하는 변환 블록의 하드웨어 구조는 공통 연산기를 사용하여 각 TU 모드에 맞는 행렬 계수들 간의 연산을 수행한다. 또한 병렬적인 구조로 설계하여 $4{\times}4$, $8{\times}8$, $16{\times}16$, $32{\times}32$ 크기 TU 모드의 행렬 연산을 처리하는 사이클수가 35cycle로 동일하게 처리된다. TSMC 180nm CMOS 공정 라이브러리를 통해 합성한 결과 $4k(3840{\times}2160)@30Hz$의 영상을 기준으로 최대 동작주파수는 400MHz이고 총 게이트 수는 159k이며, 10-Gpels/cycle의 처리량을 갖는다.

• Journal of Korea Society of Industrial Information Systems
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• v.22 no.1
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• pp.23-32
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• 2017

In this paper, We suggest a unified approach for the analysis of discrete-time MAP/G/1 queueing system. Many researches on the D-MAP/G/1 queue have been used different approach to analyze system queue length and waiting time for the same system. Therefore, a unified framework for analyzing a system is necessary from a viewpoint of system design and management. We first derived steady-state workload distribution, and then waiting time and sojourn time are derived by the result of workload analysis. Finally, system queue length distribution is derived with generating function from the sojourn time distribution.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.30 no.9C
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• pp.860-870
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• 2005

In this paper we propose a new method to derive GRM(Generalized Reed-Muller) coefacients for each $2^{n}$ polarities using cell of karnaugh map(k-map). Generally, there are the serial and parallel method to derive GRM coefficients. As a serial method, Green method generates GRM coefncients using transform matrix. And as a parallel method, Besslich algorithm produces GRM coefficients of each polarity using the generated anteriorly. Green's method generates GRM coefficients for n-variable by calculating transform matrix for one-variable and n-times kronecker product this matrix. And Besslich's method generates GRM coefficients of each polarity in order of Grey-code. But those methods have disadvantages that the number of variable exceeding four makes transform matrix large and there are so many operation steps. In this paper, GRM coefficients is generated by producing cell [$f_{i}$] minimizing variable on k-map and operating this cell [$f_{i}$] and transform matrix for one-variable. So, we can generate GRM coefficients of all polarities easily by using the proposed method.

• Journal of the Institute of Convergence Signal Processing
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• v.11 no.3
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• pp.244-249
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• 2010

The design of error correction code with low complexity has a good attraction for next generation multi-level cell flash memory. Sharing sub-expressions is effective method to reduce complexity and chip size. This paper proposes a new design method of m-bit parallel BCH encoder based on serial linear feedback shift register structure with low complexity using sub-expression. In addition, general algorithm for obtaining the sub-expression is introduced. The sub-expression can be expressed by matrix operation between sub-matrix of generator matrix and sum of two different variables. The number of the sub-expression is restricted by. The obtained sub-expressions can be shared for implementation of different m-parallel BCH encoder. This paper is not focused on solving a problem (delay) induced by numerous fan-out, but complexity reduction, expecially the number of gates.

• The Journal of the Convergence on Culture Technology
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• v.5 no.1
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• pp.395-399
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• 2019

In order to support various parallel computing systems, it is necessary to extend LLVM IR to more efficiently support vector / matrix and to design LLVM IR to machine code as a new algorithm. As shown in the IR example, RISC instruction generation is naturally generated because the RISC instruction is basically composed of the RISC instruction, and the vector instruction is also not supported. There is a need for new IR structures, command generation algorithms and related extensions to support vector / matrix more robustly. To do this, it is important to map each instruction in the LLVM IR to the appropriate instruction in the target architecture (vector / matrix) (instruction selection algorithm). It is necessary to understand the meaning of LLVM IR command, to compare the meaning of each instruction of the target architecture with syntax, and to select the instruction that matches the pattern to make mapping efficient.

• Korean Journal of Optics and Photonics
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• v.33 no.2
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• pp.59-66
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• 2022

A free-form Mueller matrix ellipsometer (MME) based on independent control of the azimuthal angle of each polarizing element is introduced. The azimuthal angles of the polarizer and the matching compensator which generate the optimum Stokes vectors of an incident beam are investigated for the polarization state generator, where the spectral responses of the retardation angle and transmittance ratio of a nonideal compensator are taken into account. Similarly, the azimuthal angles of the analyzer and the corresponding compensator are investigated for the polarization-state detector, to unambiguously determine the Stokes vector of the outcoming beam from the sample, and explicit expressions for the Stokes elements are derived. Since the suggested technique enables one to utilize a nonideal quarter-wave plate as the compensator for an MME, it will contribute to the construction and application of a Mueller matrix spectroscopic ellipsometer (MMSE) operating over a wide spectral range from deep ultra-violet to near infrared.

• Proceedings of the KIEE Conference
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• 2009.07a
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• pp.1005_1006
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• 2009

본 논문에서는 단독부하형 삼상인버터의 디지털 전압제어기를 설계한다. 단독부하운전은 선형부하의 변동이나 비선형 부하에서도 안정적인 전압을 공급하는 것이 목적이다. 삼상 인버터를 선형 제어기로 제어하기 위해서 이상동기회전자표계로 제어하지만 두 개의 간섭항 때문에 MIMO 시스템으로 되어 해석적인 제어기를 설계하기 어려워 대부분의 연구에서는 시행착오법으로 제어기를 설계하였다. 본 논문에서는 삼상 인버터의 축변환시에 발생하는 간섭항의 영향을 상대이득행렬로 분석하여 간섭항의 영향을 분석하고 삼상 인버터 시스템을 SISO 시스템으로 만들어 전압제어기만을 갖는 최소 차수의 제어기를 해석적으로 설계하며 응답속도를 향상시키기위해서 오버슈트와 정정시간을 조절할 수 있는 극배치기법으로 설계한다. 설계한 제어기는 시뮬레이션과 실험을 통해서 강인성을 보인다.

• Proceedings of the Korea Society for Industrial Systems Conference
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• 1999.05a
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• pp.53-57
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• 1999

본 논문에서는 입출력간의 연관관계가 트리구조로 표현되는 DTG(Directed tree graph)에 의한 고속병렬다치논리회로를 설계하는 알고리즘과 DTG의 각 절점에 코드를 할당하는 알고리즘을 제안한다. 임의의 절점을 갖는 DTG에 대하여 본 논문에서는 절점들이 매개변수에 의하여 표현될 때 양의 정수로 표현되도록 논리레벨 P를 할당하고 각 레벨에 각기 다른 잉여절점을 추가하여 회로를 설계한다. 또한, 절점들의 입출력 관계를 단지 하나의 매개변수 m$_{i}$를 이용하여 전달행렬 A를 구하기 때문에 더 빠르고 간단하게 회로를 설계할 수 있다. 본 논문에서 제안한 알고리즘은 Nakajima 등에 의해 제안된 알고리즘으로는 설계가 가능하지 않았던 임의의 절점을 가지는 DTG에 대해서도 회로를 설계할 수 있는 장점이 있다. 또한, 자연수 내에서 선형성, 정규성, 및 가시적인 장점을 가지며 절점수의 감소를 통한 처리속도의 향상, 회로 구성의 간략화 및 비용절감등의 장점등이 있다.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.20 no.4
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• pp.1333-1346
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• 1996

As the automation system in manufacturing field works more efficientely, the automation scheme is applied to many areas. In order to reduce the entire manufacturing, cost the design process must be automated. However, design process is so complicated, it is very difficult to construct the design automation system. The axiomatic approach to design provides a general theoretical framework for all design fields, including mechanical design. The key concepts of axiomatic design are : the existence of domains, the characteristic vectors within the domains that can be decomposed into hierarchies through zigzagging between the domains, and the design axioms. Using this approach, the glass bulb design process was analyzed and the design automation software was developed. Through menu display, a user can select or furnish the design input and generate the drawing with ease.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.30 no.4 s.247
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• pp.387-392
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• 2006

This paper predicts the modified mass and stiffness of structure using the sensitivity coefficients with the iterative method. The sensitivity coefficients are obtained by the change of the eigenvectors according to structural modification. The method is applied to an examples of a 3 degree of freedom system by modifying mass and stiffness. The predicted mass and stiffness are in good agreement with these from the structural reanalysis using the modified mass and stiffness.