• 한국게임학회 논문지
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• 제7권2호
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• pp.11-20
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• 2007

본 논문에서는 큰 변형이 일어나는 얇은 쉘을 실시간에 시뮬레이션하는 기법을 제안한다. 쉘이란 나뭇잎이나 종이와 같이 이차원 구조라 할 수 있는 얇은 물체이다. 얇은 쉘의 시각적으로 사실적인 애니메이션을 실시간에 생성하는 것은 컴퓨터 그래픽스 분야에서 오랫동안 주요한 도전 과제였다. 본 논문에서는 연속체 역학에 있어서 가장 복잡한 쉘 이론에 의존하는 대신 Grinspun 등이 제안한 이산 쉘 에너지 함수를 채용하고, 지배방정식의 실시간 적분을 위해서는 쉘 구조를 위한 모달 와핑 기법을 개발한다. 이와 같은 새로운 시뮬레이션 기법은 삼차원 솔리드를 위해 개발된 종전의 모달 와핑 기법을 확장한 것이다. 본 논문에서 제안한 방법은 매우 많은 정점으로 이루어진 메쉬 구조의 큰 휨과 큰 꼬임 변형도 실시간에 사실적으로 생성할 수 있다.

• 한국정보과학회논문지:시스템및이론
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• 제32권5호
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• pp.260-267
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• 2005

길이가 n인 알파벳 $\Sigma$상의 텍스트 T에서 패턴 P를 효율적으로 검색하기 위해 접미사 트리와 접미사 배열이 널리 쓰이고 있다. 접미사 배열이 접미사 트리보다 더 적은 공간을 사용하기 때문에 텍스트의 길이가 긴 경우에는 접미사 배열이 더 선호되고 있다. 최근에는 접미사 배열을 이용한 O(${\mid}P{\mid}{\codt}{\mid}{\Sigma}{\mid}) 시간과 O(${\mid}P{\mid}{\codt}log{\mid}{\Sigma}{\mid}$) 시간 검색 알고리즘들이 개발되었다. 본 논문에서는 접미사 배열을 이용한 시간과 공간 효율적인 알고리즘들을 제시한다. 하나의 알고리즘은 O(${\mid}P{\mid}{\codt}{\mid}{\Sigma}{\mid}$) 비트 공간을 사용하여 O(${\mid}P{\mid}$) 시간에 수행되고, 다른 하나는 O($n{\cdot}log{\mid}{\Sigma}{\mid}+{\mid}{\Sigma}{\mid}{\cdot}$nlog log n/logn)비트 공간을 사용하여 O(${\mid}P{\mid}{\codt}log{\mid}{\Sigma}{\mid}$) 시간에 수행되는데, 두 번째 알고리즘은 보다 효율적인 공간을 사용하면서 여전히 빠른 알고리즘이다. 본 논문이 제시하는 알고리즘들이 시간과 공간에 있어 기존의 알고리즘들보다 더 효율적인 알고리즘들임을 실험을 통해 보여주고 있다.

• 철학연구
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• 제130권
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• pp.23-45
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• 2014

M. 셸러는 지각론에서도 생명철학을 하고 있다. 그래서 기존 지각론과는 상이한 충박조건 지각론을 전개한다. 그에 따르면 감각지각을 할 때도 활력적 충박에 의해서 일구진 토대 위에서 할 수 있는 것이지, I. 칸트나 E. 마흐의 생각처럼 감각기관이 수용한 감각소여를 지각 주체가 자발적으로 구성하면서 감각지각 하는 것이 아니다. 감각은 일차적이지 않고, 선사랑, 선관심이라 할 수 있는 초의식적 활력 충박에 뒤따른다. 그리고 감각지각은 활력적 충박의 힘없이 생겨날 수 없기 때문에, 어떤 대상에 반응하고 그럼으로써 저항하는 충박을 발동하지 않으면 우리는 그 대상을 지각할 수 없다. 셸러는 환영의 상이 지각에 선행하여 존재하며, 지각이 감각의 기능들에 관계해서 먼저 일어나며, 그리고 감각 기능들이 감각들에 관계해서 먼저 일어난다고 말한다. 이런 지각의 토대질서를 주목하게 될 때, 그리고 생명의 본질이 선경험적이고, 순수한 생성과 소멸이며, 그리고 생성과 소멸의 경험적 측면이 아직 분리되지 않는 하나의 과정임을 주목하게 될 때, 지각이 활력적 충박에 의해서 조건 지워져 있음을 쉽게 알 수 있다. 셸러의 충박을 조건으로 하는 지각설은 또한 동물들의 운동성이 그들의 감각적 장치를 결정한다는 사실에 의해서도 지지된다. 동물들은 그들의 충박 운동적 행동에 유의미한, 유혹하고 주목시키는 대상들의 기호로서 기여할 수 있는 감각체계를 가지고 있다. 그래서 이를테면 도마뱀은 강렬하게 나는 총소리에 방해받지 않고 머물러 있지만, 풀 섶에서 나는 바스락거리는 소리에는 민감하게 반응한다.

• Journal of Power Electronics
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• 제17권2호
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• pp.358-367
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• 2017

This paper presents a novel filtering method for speed measurements to improve the low-speed performance of the direct-drive permanent magnet traction machines for elevators. Based on the theory of nonlinear tracking differentiator (NTD), this method, which can act as a high performance filter of a raw speed signal, obtains a more accurate speed feedback signal when applying a low-resolution encoder. In addition, it can relieve the interference caused by the position derivative for speed sampling. By analyzing the frequency response of the NTD, the influence of its parameters on the performance of the speed filtering is investigated. Compared with different types of low-pass filters, the proposed method shows a shorter time delay and a stronger ability in terms of noise suppression when the parameters are selected carefully. In addition, when using the measured speed signal through a nonlinear tracking differentiator as the feedback of the system, the motor runs more steadily at low speeds. As a result, the riding comfort of a direct-drive elevator can be improved. The feasibility of the proposed strategy was verified on an 11.7kW elevator traction machine using a commercial inverter.

• 사상체질의학회지
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• 제32권3호
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• pp.1-7
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• 2020

Objective The purpose of this study was to understand the conclusion of 「Gwangjeseol」 in 『Dongeuisusebowon』 in a more accurate sense. Method We examined the basic viewpoint of Lee je-ma in 「Seongmyeonglon」 in 『Dongeuisusebowon』. Based on the interpretation of the 「Seongmyeonglon」, the viewpoints described in the pathology theory of 『Dongeuisusebowon』 were examined. In addition to 『Dongeuisusebowon』, we looked for contents related to "TuHyeonJilNeung" and "HoHyeonNagSeon" in Lee je-ma's book 『Gyukchigo』 and 『Dongmuyugo』. Result We have found that the meanings of the words "TuHyeonJilNeung" and "HoHyeonNagSeon" in the last article of 「Gwangjeseol」 are not limited to just the 「Gwangjeseol」, but contain the meaning of a topic that runs through the entire book. According to the 『Gyukchigo』 and 『Dongmuyugo』, the meaning of "TuHyeonJilNeung" is related to the "Sa-Bang-Il-Yog", and the "Sa-Bang-Il-Yog" is the "ilsimjiyog" that prevents the practice of "Ji-Haeng". This concept is the same as the concept of "Ji-Haeng" in 「Seongmyeonglon」, the first unit of 『Dongeuisusebowon』. Conclusion It is considered that Lee je-ma wanted to emphasize the reason and mindset to do "Ji-Haeng" by writing the end of the 「Gwangjeseol」, which is the last part of 『Dongeuisusebowon』.

• The Journal of Asian Finance, Economics and Business
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• 제8권1호
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• pp.71-79
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• 2021

This study investigates the capital structure policy among Indonesian public companies. Previous studies suggest that capital structure policy could follow either static or dynamic behavior. The sample data used in this study was companies in the manufacturing sector, divided into three sub-sectors: the basic and chemical industry, miscellaneous industry, and the consumer goods industry. This study uses panel data from 2010 to 2018, with the Generalized Least Square (GLS) method and compared whether the fixed effect model is better than the common effect model. The results show that the dynamic and non-linear model tests can explain the capital structure determinants than the static and linear models. The dynamic model shows that the capital structure of a certain year is influenced by the capital structure of the previous year. The findings indicate that the company performs some adjustments in its capital structure policy by referring to the previous debt ratio, which implies support to the trade-off theory (TOT). The study also shows that profitability, tangible assets, size, and age explain the variation of capital structure policy. The patterns on the dynamic and non-linear confirm that capital structure runs in a nonlinear pattern, based on the sector, company condition, and the dynamic environment.

• Biotechnology and Bioprocess Engineering:BBE
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• 제9권5호
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• pp.331-338
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• 2004

The Separation of two amino acids, phenylalanine and tryptophan, was carried out using laboratory simulated moving bed (SMB) chromatography. The SMB process consisted of four zones, with each zone having 2 columns. The triangle theory was used to obtain the operating conditions for the SMB. The mass transfer coefficients of the two amino acids were obtained from the best-fit values by comparing simulated and experimental pulse data. The competitive adsorption isotherms of the two amino acids were obtained by single and binary frontal analyses, taking into consideration the competition between the two components. A competitive Langmuir isotherm, obtained from single-component frontal chromatography, was used in the first run, and the isotherm from binary frontal chromatography in the second, with the flow rate of zone 1 modified to improve the purity. Compared to the first and second runs, the competitive Langmuir isotherm from the binary frontal chromatography Showed good agreement with the experimental results. Also, adjusting the flow rate in zone 1 increased the purity of the products. The purities of the phenylalanine in the raffinate and the tryptophan in the extract were 99.84 and $99.99\%$, respectively.

• 한국태양에너지학회 논문집
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• 제33권1호
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• pp.40-47
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• 2013

An aerodynamic design tool was developed for small wind turbine blades based on the blade element momentum theory. The lift and drag coefficients of blades that are needed for aerodynamic blade design were obtained in real time from the Xfoil program developed at University of Illinois. While running, the developed tool automatically accesses the Xfoil program, runs it with proper aerodynamic and airfoil properties, and finally obtains lift and drag coefficients. The obtained aerodynamic coefficients are then used to find out optimal twist angles and chord lengths of the airfoils. The developed tool was used to design a wind turbine blade using low Reynolds number airfoils, SG6040 and SG6043 to have its maximum power coefficient at a specified tip speed ratio. The performance of the blade was verified by a commercial code well known for its prediction accuracies.

• Communications for Statistical Applications and Methods
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• 제14권3호
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• pp.483-495
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• 2007

In a general fractional factorial design, the n-levels of a factor are coded by the $n^{th}$ roots of the unity. Pistone and Rogantin (2007) gave a full generalization to mixed-level designs of the theory of the polynomial indicator function using this device. This article discusses the optimal blocking scheme for nonregular designs. According to hierarchical principle, the minimum aberration (MA) has been used as an important criterion for selecting blocked regular fractional factorial designs. MA criterion is mainly based on the defining contrast groups, which only exist for regular designs but not for nonregular designs. Recently, Cheng et al. (2004) adapted the generalized (G)-MA criterion discussed by Tang and Deng (1999) in studying $2^p$ optimal blocking scheme for nonregular factorial designs. The approach is based on the method of replacement by assigning $2^p$ blocks the distinct level combinations in the column with different blocks. However, when blocking level is not a power of two, we have no clue yet in any sense. As an example, suppose we experiment during 3 days for 12-run Plackett-Burman design. How can we arrange the 12-runs into the three blocks? To solve the problem, we apply G-MA criterion to nonregular mixed-level blocked scheme via the mixed-level indicator function and give an answer for the question.

• 산업경영시스템학회지
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• 제26권3호
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• pp.58-66
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• 2003

The cut tree approach of Montreuil and Ratliff [16] and eigenvector approach [10] are used to automatically draw a feasible facility layout with aisle structure. The department arrangement can minimize an aisle distance criterion considering door locations and dimension constraints. The aisle distance is measured by the door to door distance between departments. An eigenvector and cut tree approaches [1] are implemented based on the branch and bound technique in Kim et al. [2] in order to obtain feasible layouts. Then, the algorithm to fix the door location of each department is developed. After the door locations are determined, the factory layout is evaluated in terms of aisle distance. The aisle structure is obtained by expanding the original layout. The solution is kept until we will find better factory layout. The proposed approach based on the branch and bound technique, in theory, will provide the optimal solution. If the runs are time and/or node limited, the proposed method is a strong heuristic. The technique is made further practical by the fact that the solution is constrained such that the rectangular shape dimensions length(l) and width(w) are fixed and a perfect fit is generated if a fit is possible.