• 정보기술과데이타베이스저널
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• 제7권2호
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• pp.47-59
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• 2000

In this paper, we analyze the applicability of a general optimization algorithm to a database optimization problem. The index selection problem Is the problem to choose a set of indexes for a database in a way that the cost to process queries in the given workload is minimized subject to a given storage space restriction for storing indexes. The problem is well known in database research fields, and many optimization and/or heuristic algorithms have been proposed. Our work differs from previous research in that we formalize the problem in the form of non-linear Integer Programming model, and investigate the feasibility and applicability of a general purpose optimization algorithm, called OPBDP, through experiments. We implemented algorithms to generate workload data sets and problem instances for the experiment. The OPBDP algorithm, which is a non-linear 0-1 Integer Programming problem solver based on Davis-Putnam method, worked generally well for our problem formulation. The experiment result showed various performance characteristics depending on the types of decision variables, variable navigation methods and ocher algorithm parameters, and indicates the need of further study on the exploitation of the general purpose optimization techniques for the optimization problems in database area.

• Nuclear Engineering and Technology
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• 제53권1호
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• pp.253-257
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• 2021

This work demonstrates the use of baromembrane method based on reverse osmosis (RO) process. The method is realized on mobile complex, which allows to concentrate and determine ultra-low activity of radionuclides in water cooling ponds of Russian nuclear fuel cycle enterprises. The existence level of radionuclide background creates difficult conditions for identification the contribution of liquid discharges enterprise, as standard monitoring methods have a very high detection level for radionuclides. Traditional methods for determining the background radionuclides concentrations require the selection of at least 500 liters (l) of water, followed by their evaporation to form a dry residue. This procedure with RO membranes requires at least 5 days. It is possible to reduce the time and energy spent on evaporation of hundreds of water liters by pre-concentrating radionuclides in a smaller sample volume with baromembrane method. This approach allows preliminary concentration of water samples from 500 l volume till 20 l volume during several hours. This approach is universal for the concentration of dissolved salts of any heavy metals, other organic compounds and allows the preparation of water countable samples in much shorter time compared to the traditional evaporation method.

• 전기학회논문지
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• 제60권1호
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• pp.167-173
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• 2011

Most of the terminologies used in medical domain is not intended to be applied directly in clinical setting but is developed to integrate the terms by defining the reference terminology or concept relations between the terms. Therefore, it is needed to develop the subsets of the terminology which classify categories properly for the purpose of use and extract and organize terms with high utility based on the classified categories in order to utilize the clinical terms conveniently as well as efficiently. Moreover, it is also necessary to develop and upgrade the terminology constantly to meet user's new demand by changing or correcting the system. This study has developed a mapping tool that allows accurate expression and interpretation of clinical terms used for medical records in electronic medical records system and can furthermore secure semantic interoperability among the terms used in the medical information model and generate common terms as well. The system is designed to execute both 1:1 and N:M mapping between the concepts of terms at a time and search for and compare various terms at a time, too. Also, in order to enhance work consistency and work reliability between the task performers, it allows work in parallel and the observation of work processes. Since it is developed with Java, it adds new terms in the form of plug-in to be used. It also reinforce database access security with Remote Method Invocation (RMI). This research still has tasks to be done such as complementing and refining and also establishing management procedures for registered data. However, it will be effectively used to reduce the time and expenses to generate terms in each of the medical institutions and improve the quality of medicine by providing consistent concepts and representative terms for the terminologies used for medical records and inducing proper selection of the terms according to their meaning.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1992년도 한국자동제어학술회의논문집(국내학술편); KOEX, Seoul; 19-21 Oct. 1992
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• pp.874-879
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• 1992

It is shown that there exists a nonlinear mappping which transforms features and their changes to the desired camera motion without measurement of the relative distance between the camera and the part, and the nonlinear mapping can eliminate several difficulties encountered when using the inverse of the feature Jacobian as in the usual feature-based visual feedback controls. And instead of analytically deriving the closed form of such a nonlinear mapping, a fuzzy membership function (FMF) based neural network is then proposed to approximate the nonlinear mapping, where the structure of proposed networks is similar to that of radial basis function neural network which is known to be very useful in function approximations. The proposed FMF network is trained to be capable of tracking moving parts in the whole work space along the line of sight. For the effective implementation of proposed IMF networks, an image feature selection processing is investigated, and required fuzzy membership functions are designed. Finally, several numerical examples are illustrated to show the validities of our proposed visual servoing method.

• 한국건설관리학회논문집
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• 제17권2호
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• pp.135-145
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• 2016

최근 국내 공동주택 골조공사에 있어서 소음저감형 알루미늄 거푸집의 활용이 증가하고 있다. 그러나 현재까지 개발된 소음저감형 알루미늄 거푸집은 복잡한 작업프로세스로 인해 작업 생산성이 저하되고, 특히 설치 해체 작업 시 알루미늄의 물성으로 인해 발생하는 소음을 여전히 방지하지 못한다는 문제점을 지니고 있다. 따라서 본 연구의 목적은 새로운 소음저감형 알루미늄 거푸집의 최적 개념디자인을 제안하고, 최적 개념디자인을 토대로 제작된 워킹목업(Working Mock-up)의 기술적 타당성을 검토하는 것이다. 이를 위해 본 연구에서는 기존 알루미늄 거푸집의 분석을 통해 새로운 형태의 소음저감형 알루미늄 거푸집 개넘디자인 3개 안을 도출하였으며, 현장 전문가 설문조사를 통해 AHP 분석을 수행하였다. AHP 분석 기법을 활용하여 Trade-off Analysis를 수행한 결과, 안전성(0.52)과 작업편의성(0.54) 부분에서 가장 높은 가중치 값이 도출된 '드롭다운 동바리와 가변빔이 적용된 소음저감형 시스템 알루미늄 거푸집'이 최적 개념디자인으로 선정되었다. 본 연구를 통해 도출된 소음저감형 알루미늄 시스템 거푸집의 최적 개념디자인은 기존 소음저감형 시스템 거푸집의 문제점을 해결하고, 실질적인 소음저감은 물론 작업 편의성 및 노무자의 안전성이 제고된 실제 소음저감형 알루미늄 거푸집의 개발에 활용될 수 있을 것으로 기대된다.

• 한국의상디자인학회지
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• 제16권2호
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• pp.81-100
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• 2014

The purpose of this study is to link traditional patterns to mordern clothing. Of all the traditional patterns, the fish pattern was chosen for use during the development of a creative one-piece design for woman and shirts design for man. This study is based upon document searches, including research papers. Through these searches, it investigates the symbolic meaning, formation of the fish pattern and the creative design process. Based on this investigation, the study attempts to modernize the fish pattern and apply the fish patterns to the design of a one-piece dress and shirts. The design procedure includes three sub-processes: selection, arrangement and color-scheme. The selection process, the form of the pattern was edited using Adobe Photoshop. The arrangement of the pattern was made through the checklist conception method, containing the following functions: expand, reset, repeat, omission and dismantling. For the color-scheme of the pattern, Paul Klee(1879-1940)work was selected, and the colors in his work were adopted when dyeing the rest of the one-piece dress and shirts as well as fish features. In conclusion, six designs of the one-pieces dress and shirts were created by using one of Korea's traditional patterns-the fish pattern. This kind of study not only let the world know about the unique beauty of nations but also helps to inspire people who has a profession in design, by suggesting design development process based on design competitiveness improvement factor from fusion of tradition and modern.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2000년도 제15차 학술회의논문집
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• pp.493-493
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• 2000

Multi-valued decision making for transitional stochastic events was newly derived based on conditional probability of database. The two values (on-off) decision making method without transition had been proposed by one of the author in a previous work for a purpose of realizing human on-off decision making. The current method is an extension of the previous on-off decision making. By combining the conditional probability and the transitional probability, the closed form of the algorithm for the multi-valued transitional decision making was derived. The proposed multi-valued decision making was successfully applied to the determination of the five levels of the vigilance of a subject during the EEG recording; awake stage, drowsy stage and sleeping stages (stage 1, stage 2/3, REM (rapid eye movement)). The method for determining the vigilance level can be directly usable for the two purposes; selection of awake EEG segments for automatic EEG interpretation, and determination of sleep stages through sleep EEG. The proposed multi-valued decision making with a mathematical background of the probability can be applicable widely, in industries and in medical fields for purposes of the multi-valued decision making.

• 대한건축학회논문집:계획계
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• 제34권11호
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• pp.113-123
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• 2018

First of all, the multi-story Housing applying resident's participation in europe was classified by the menu selection method, the two-step supply method and the cooperative method. And then I analyzed flexible unit plan of cases for deriving the planning methode and the characteristics of flexibility. First, I analyzed the area and form of the unit plan, structure and Installation, fixed and variable elements to derive the planning method. The area of units are distributed from a minimum of $35m^2$ to a maximum of $150m^2$, and many of the unit planes have a narrow front and a deep depth. The structure is a long-span wall-structure or a skeleton structure, and is designed without any columns and bearing walls in the interior space for flexibility in spatial composition. The vertical shafts are located in the center of the unit in a box-form or in the corner at the unit dividing wall for free placement of interior wall. Fixed elements are framework and facility systems. Most of the future residents in the two-steps supply method and the cooperative method were able to freely design the internal space within the zoning concept proposed by the architect and change the location of the facade element within module system proposed by the architect. Second, the characteristics of the flexibility applied to the unit plan were divided in integrated flexibility, functional flexibility, construction flexibility, and supply flexibility. The integrated flexibility enables residents to give the variable space combination based on the complex structure of the inner space for providing various living experiences. Regarding functional flexibility, the three-dimensional spatial structure with neutral space has multi-functionality according to the needs of residents and easily accepts mixing of hybrid programs such as work and residence. Constructive flexibility allows residents to create identity by freely planning interior space and changing the size or location of facade components in a determined system of architects. Finally, various types of size and space composition are proposed and realized in the whole building applying menu selection method, so that flexibility in the offer can accommodate and integrate various types of living.

• 패션비즈니스
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• 제26권4호
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• pp.32-51
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• 2022

This study analyzed the characteristics and expression techniques of men's fashion bags and their aesthetic and formative values in modern men's fashion from the perspective of neo-deconstructivism. The study subjects were men's fashion bags appearing in four collections in Paris, Milan, London, and New York in the 2019 S/S-2021 S/S season. As a research method, the characteristics and expression techniques of the new disintegration of men's fashion bags were analyzed and categorized through prior research and literature research. The results of the study are as follows: First, the neoclassical characteristics of men's fashion bags caused 'Re-creation' to appear as the dissolution of the design principle and structure of the bag, and it was derived as 'decomposition of form' and 'decomposition of dress method'. Second, the 'Inclusive Diversity' of modern men's fashion bags of neo-deconstructivism appears in the form of gender demarcation and dissonance coordination. Third, 'Playfulness' in men's fashion bags involves the pursuit of fun through unconventional changes in the shape, size, and design of the bag, and it sometimes provides a fresh, new play experience through unpredictable design elements. Fourth, the 'Pursuit of new values' in male's fashion bags was a characteristic wherein the boundary between DIY attire and daily clothes and high fashion by the individual selection of consumers was blurred. This work is meaningful in that it conducted a basic study of men's fashion bags by examining the modern men's fashion bag from the perspective of the philosophical trend of neo-deconstructivism and categorizing its characteristics.

• 한국잠사곤충학회지
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• 제7권
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• pp.65-74
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• 1967

본 연구는 생사의 비균일성 섬도발생의 원인을 구명하기 위하여 견사형성에 관련되는 잠체기관의 해부학적 조사를 하였고 나아가서 그 비균일성을 개선하는 방안을 연구한 것이며 다음의 결과를 보았다. 1. 잠아의 토사관구조자체가 견사형성에 있어서 견사단면형태를 결정할뿐 아니라 견사선내의 견물질이 토사진행과 더불어 감소될 때 압출근육의 작용으로 섬도가 점차 가늘어져서 비균일성의 소인이 된다. 2. 우리나라 고치는 품종에 따라 다소의 차이는 있으나 견사종합섬도편차가 평균 0.58d로서 생사로 될 때 부득이 비균일성의 소인이 되고 있다. 3. 견사섬도가 생사목적섬도에 적합하지 못할때 더욱 비균일성이 악화된다. 4. 제사과정에서 작업부주의가 생사섬도의 비균일성에 크게 미치고 있으며 어느 조사법이 든간에 30％ 이상의 원인이 되고 있다. 5. 생사섬도 비균일성을 개선하는 데는 짐품종 선정을 심중히 하여 적절한 견사섬도를 택하여야 한다. 6. 정섬도조사법은 정립조사법에 비하여 섬도비균일성을 개선하게 되며 최소한 20％ 향상을 기할 수 있다. 7. 다조조사기에 사용할 수 있는 섬도감지기를 고안하여 시험조사한 결과 일반조사법에서 21 중사의 섬도편차가 1.57d인데 반하여 시험구는 1.30d이였으며 등급상으로 2격을 향상시킬 수 있었다.