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고속 DCT 알고리즘을 이용한 DCT 및 IDCT 구조
이승욱,임강빈,정화자,정기현,김용덕 대한전자공학회 1994 전자공학회논문지-B Vol.b31 No.3
This paper proposes an implementation of DCT (Discrete Cosine Transform) and IDCT (Inverse DCT) using a fast DCT algorithm with shift and addition operations instead of multiplications Based on the proposed algorithm, a new VLSI architecture for the DCT and the IDCT is proposed. It shows modularity , regularity and capability for multiprocessing. Its performance is also simulated by a simulation software, "Compass". The results of the simulation provide the quality of decompression images, the increase in processing speed, representing the superiority of the proposed architecture.
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이승욱,이건복 대한기계학회 1994 대한기계학회논문집 Vol.18 No.9
In this work the dynamics of an electromagnetic levitation system is described by a set of three first order nonlinear ordinary differential equations. The objective is to design a digital linear controller which takes the inherent instability of the uncontrolled system and the disturbing force into consideration. The controller is made by employing digital linear quadratic(LQ) design methodology and the unknown state variables are estimated by the kalman filter. The state estimation is performed using not only an air gap sensor but also both an air gap sensor and a piezoelectric accelerometer. The design scheme resulted in a digital linear controller having good stability and performance robustness in spite of various modelling errors. In case of using both a gap sensor and an accelerometer for the state estimation, the control input was rather stable than that in a system with gap sensor only and the controller dealt with the disturbing force more effectively.
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Markov Chain을 이용한 인구이동 경향 : 1981년부터 1988년까지의 자료를 중심으로
이승욱,남봉현 한국보건통계학회 1989 한국보건정보통계학회지 Vol.14 No.1
In this study, migration in which individuals move through a finite set of states according to a discrete-time Markov Chain Model is considered. In this Model, underlying assumptions are ⅰ) Social structure is closed, ⅱ) The probability function for the observed proportions of the transition probabilities is assumed to have a multinomial distribution, and ⅲ) The transition probabilities are constant and homogeneous aver time. After deriving the maximum likelihood estimates of transition probability(p_ij), limiting structure and stationary probability matrix are studied.
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이승욱,장용철,김보생 한국폐기물자원순환학회 2013 한국폐기물자원순환학회지 Vol.30 No.7
The development of recycling technology and process of waste electrical and electronic equipment (WEEE), also called electronic waste is becoming a growing interest in the world from the perspective of material recovery and resource conservation. In this study we examined the recycling technology levels of WEEE by both group category and recycling process using expert surveys. Based on the results of the expert surveys conducted, the level of large home appliances was found to be approximately 81.1% (± 6.2% std) when compared with that of the advanced countries, while small home appliances and IT equipment and audio/video equipment were 73.5% (± 6.2% std) and 76.2% (± 6.2% std), respectively. In case of recycling pre-treatment process (e.g., disassembly, size reduction, and separation), the technological levels was found to be approximately 82.2%, while the material recovery process followed by the pretreatment process was estimated to be approximately 68.5%. The results of reliability test for the expert survey showed that the values of coefficient of variation (CV) for the pre-treatment process and material recovery process by group category and recycling process are less than 0.5, which is a guidance limit for the coefficient. Based on the statistical tests (ANOVA and t-test), there is no significant difference of the recycling technological levels among the group category (large home appliances, small home appliances, IT equipment, and audio/video equipment. However, the statistical difference between the pre-treatment process and material recovery process within the group category existed (p-value < 0.05) using t-test. In this study, the results imply that there is still a need for developing a variety of more advanced recycling technologies of WEEE to effectively recover valuable metals and materials from it, especially in the fields of metal recovery and extraction processes.
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ILO 강제근로금지협약에 비추어 본 일본군위안부제도의 적법성
이승욱 법과사회이론학회 2003 법과 사회 Vol.24 No.-
From 1995, the Committee of Experts on the Application of Conventions and Recommendations(CEACR), one of ILO(International Labour Organization)'s regular surveillance bodies, has made several comments regarding so-called wartime "comfort women." In those comments, CEACR has made clear that the system of wartime comfort women forced by Japanese Army was against the Forced Labour Convention 1930, which is one of the fundamental Conventions of ILO. CEACR recognized that the Convention was in force for Japan during the Second World War, and characterized such conduct as sexual slavery in violation of the Convention. Regarding the relevance of the Convention to the issue of wartime "comfort women" in the light of the exemptions in Article 2 of the Convention, CEACR concluded that such conduct does not fall within the exemptions contained in Article 2(2)(d) and 2(2)(a) of the Convention, and clearly therefore there was violation of the Convention by Japan. Accordingly, CEACR requested that Japanese Government should take responsibility for the measures necessary to meet the expectations of the victims, and that it take steps expeditiously, and also to respond on measures taken further to the court decision and any other measures to compensate the victims. However, with regard to war-related compensation, the position of the Japanese Government is that the Japan-South Korea Basic Treaty of 1965 had put an end to the right to demand compensation. This article reviews the Japanese Government's position in the light of the principles developed by ILO regarding Forced Labour Convention. As a conclusion, this article suggests that there should be a close cooperation with Chinese Labour Organization to solve the questions regarding the wartime comfort women, and that the Korean Government should ratify the Forced Labour Convention 1930 to achieve wide supports from the rest of the member states of ILO.
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