• 한국정보통신학회논문지
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• 제18권1호
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• pp.78-83
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• 2014

본 논문에서는 연산 시간이 긴 곱셈기 패스를 낮은 주파수에서 동작하는 저면적의 HEVC(High Efficiency Video Coding)용 다중 모드 일차원 변환 블록을 구현하는 효율적인 방법을 제시하였다. 제시한 방법은 전체 면적을 줄이기 위하여 일반적인 변수와 변수를 입력으로 받는 곱셈기 대신 행렬의 계수 특성을 이용한 상수와 변수를 입력으로 받는 상수 곱셈기를 사용하였다. 상수 곱셈기 사용으로 인하여 전체적인 처리량을 증가시켰으며 늘어난 처리량으로 인해 남는 동작 사이클을 이용하여 연산시간이 많이 걸리는 곱셈기 부분에 멀티 사이클 패스를 구성하여 곱셈기의 동작 주파수를 낮게 하면서 전체 연산량은 유지시켰다. TSMC 0.18um CMOS 공정 라이브러리를 이용하여 실제 하드웨어를 구현한 결과 4k($3840{\times}2160$) 영상을 기준으로 최소 동작 주파수는 186MHz이고 최대 동작 주파수는 300MHz이다.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2000년도 제15차 학술회의논문집
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• pp.370-370
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• 2000

In this paper, we design a Multi-Fuzzy model by means of HCM clustering and genetic algorithms for a nonlinear system. In order to determine structure of the proposed Multi-Fuzzy model, HCM clustering method is used. The parameters of membership function of the Multi-Fuzzy ate identified by genetic algorithms. A aggregate performance index with a weighting factor is used to achieve a sound balance between approximation and generalization abilities of the model. We use simplified inference and linear inference as inference method of the proposed Multi-Fuzzy mode] and the standard least square method for estimating consequence parameters of the Multi-Fuzzy. Finally, we use some of numerical data to evaluate the proposed Multi-Fuzzy model and discuss about the usefulness.

• 대한전자공학회논문지SD
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• 제46권10호
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• pp.79-85
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• 2009

본 논문은 $0.18{\mu}m$ CMOS 공정을 이용하여 3.2 Gb/s serial link receiver를 설계하였다. High-speed links의 performance를 제한하는 가장 큰 요소는 transmission channel bandwidth, timing uncertainty가 있다. 이러한 문제점을 해결하기 위한 방법으로 multi-level signaling(4-PAM)을 이용하였다. 추가적으로 전송속도를 높이고 BER를 낮추기 위한 방법으로 current-mode amplifier, CML sampling latch를 사용하였다. 4-PAM receiver의 최대 데이터 전송속도는 3.2 Gb/s이다. BER은 $1.0{\times}10^{-12}$ 이하이며 chip size는 $0.5\;{\times}\;0.6\;mm^2$이고 1.8 V supply voltage에서 49mA current를 소모한다.

• Advances in Computational Design
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• 제8권4호
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• pp.327-351
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• 2023

This article explores how multi-objective optimization techniques can be used to design cost-effective and structurally optimal spatial steel structures, highlighting that optimizing performance can be as important as minimizing costs in real-world engineering problems. The study includes the minimization of maximum horizontal displacement, the maximization of the first natural frequency of vibration, the maximization of the critical load factor concerning the first global buckling mode of the structure, and weight minimization as the objectives. Additionally, it outlines a systematic approach to selecting the best design by employing four different evolutionary algorithms based on differential evolution and a multi-criteria decision-making methodology. The paper's contribution lies in its comprehensive consideration of multiple conflicting objectives and its novel approach to simultaneous consideration of bracing system, column orientation, and commercial profiles as design variables.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 1999년도 봄 학술발표회 논문집
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• pp.159-168
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• 1999

In seismic analysis, there are two main ways - uniform load method and dynamic analysis, dynamic analysis can be divided into response spectrum analysis and time history analysis. In case of which get the complexion of the vibration with 3-axis of coordinate direction in each mode of free vibration mode happened owing to complication of the shape, 3-dimensional dynamic analysis is recommended to perform as multi-mode spectral analysis in standard specification for highway bridge. The purpose of this study is to understand the dynamic behavior by performing multi-mode seismic analysis according to responses analysis and time history anal)'sis in using record of earthquake. In accordance with the criterion of seismic design as defined in standard specification for highway bridge by using modified records of the El Centre and Coyote Lake earthquake, response spectrum was constructed by using the tripartite logarithmic plot. The 3-span continuous space truss bridge was selected as model of numerical analysis. As the result performed time history analysis and analysis of response spectrum for the model of numerical analysis, the result of time history analysis was slightly larger than that of response spectrum analysis. This coincide with the tendency of the result came from the analysis when using a jagged response spectrum analysis, This coincide with the tendency of the result came from the analysis when using a jagged response spectrum for a single excitation. In the Process of performing these two analysis. response spectrum analysis is more effective than time history analysis in saving times in analyzing data.

• 한국멀티미디어학회논문지
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• 제11권9호
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• pp.1277-1285
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• 2008

본 논문에서는 WiMAX 와 HSDPA 모드를 모두 지원하는 SCA 기반 다중모드 SDR 단말의 컴포넌트를 설계하고 블럭도를 제시하였으며, 실제 실험을 통한 경량화 대상 분석을 통해 SDR 단말 구현 시 어느 구성요소를 경량화해야 하는 지 분석해 보았다. 또한, 컴포넌트 재구성 분석을 통하여 동적 재구성 전체 시간 측정을 위한 일반 식을 도출하였고, 분석 결과를 토대로 SCA 규격의 인터페이스와 수행절차를 위배하지 않는 범위 안에서 총 22단계에 걸친 컴포넌트 레벨 동적 재구성 알고리즘을 설계하였다.

• 한국항해항만학회지
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• 제42권2호
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• pp.87-96
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• 2018

A trajectory control system plays an important role in controlling motions of marine vehicle when a series of way points or a path is given. In this paper, a sliding mode control (SMC)-based trajectory tracking controller for marine vehicles is presented. A small-sized unmanned ship is considered as a control object. Both speed and heading angle of a ship should be controlled for tracking control. The common point of related researches was to separate ship's speed and heading angle in control methods. In this research, a new control law from a general sliding mode theory that can be applied to MIMO (multi input multi output) system is derived and both speed and heading angle of a ship can be controlled simultaneously. The propulsion force and rudder force are also applied in modeling stage to achieve accurate simulation. Disturbance induced by wind is also tackled in the dynamics considering robustness of the proposed control scheme. In the simulation, we employed a way-point method to generate ship's trajectory and applied the proposed control scheme to ship's trajectory tracking control. Our results confirmed that the tracking error was converged to zero, thus demonstrating the effectiveness of the proposed method.

• 한국정보통신학회논문지
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• 제15권2호
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• pp.432-438
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• 2011

IEEE 802.11n 표준에 제시된 3가지 블록길이(648, 1296, 1944)와 4가지 부호율(1/2, 2/3, 3/4, 5/6)을 지원하는 다중모드 LDPC(low density parity check) 복호기의 최적 설계조건을 분석하였다. 최소합 알고리듬과 layered 복호방식이 적용된 LDPC 복호기의 고정소수점(fixed-point) 시뮬레이션 모델을 Matlab으로 개발하였다. 고정소수점 시뮬레이션을 통해 복호기 내부 비트 폭, 정수 부분과 소수 부분의 비트 폭에 따른 복호 수렴속도를 분석하여 다중모드 LDPC 복호기의 하드웨어 구현을 위한 최적의 설계조건을 탐색하였으며, 블록길이와 부호율에 따른 복호성능을 분석하였다.

• 유통과학연구
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• 제19권12호
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• pp.15-22
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• 2021

Purpose: There is still lack of guidance for merchants toward price discount presentations (absolute/relative), especially for consumers in different purchase contexts. Based on the general evaluability theory, this study investigates consumers' preferences for the presentation of discounts in various contexts through experiments. Research design, data and methodology: The relationship between discount presentation and consumers' preference is investigated in Study 1 using a two-factor between-subject design of 2 (purchase type: material vs. experiential) ×2 (discount type: absolute vs. relative). The Moderating effect of thinking mode has been examined in Study 2 via a multi-factor intergroup design of 2 (purchase type: material vs. experiential) ×2 (discount type: absolute vs. relative) ×2 (cognitive load: high vs. low). One-way ANOVA and planned contrast have been performed for analysis. Results: Experiment 1 reveals that consumers prefer absolute discounts rather than relative discounts when in material purchases. However, when in experiential purchases, they are willing to choose relative discounts. Experiment 2 verifies the boundary conditions of matching effect and illustrates the generation of matching effect is determined by thinking mode. Conclusions: Our study enriches the theories of purchase type and thinking mode. Simultaneously, the results provide practical guidance for merchants to formulate the discount presentation and distribution pricing strategies.

• 대한기계학회논문집
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• 제18권8호
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• pp.1985-1996
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• 1994

A new design method of sliding hyperplanes is proposed in the synthesis of a variable structure controller for robust tracking of general nonlinear multi-input-output(MIMO) uncertain systems of relative degree higher than two. Input/ output(I/O) linearzation is firstly undertaken by employing the concept of relative degree and minimum phase followed by the construction of sliding mode controllers. Sliding hyperplanes are then derived from the inherent properties of companion matrix and ideal sliding mode characterized in I/O linearized system. Subsequently, the gradient magnitudes of the sling hyperplanes are determined in an optimal manner by considering a quadratic performance index to be evaluated at two phases; a reaching phase and a sliding phase. The proposed design methodology is relatively straightforward and systematic compared with conventional strategies such as geometric approach or pole assignment technique. A nonlinear governor and exciter control problem for a power system is adopted herein in order to demonstrate the design efficiency and also favorable and robust control performances.