• KSII Transactions on Internet and Information Systems (TIIS)
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• 제9권9호
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• pp.3293-3311
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• 2015

Cloud services are required to be composed as a single service to fulfill the workflow applications. Service composition in Cloud raises new challenges caused by the diversity of users with different QoS requirements and vague preferences, as well as the development of cloud computing having geographically distributed characteristics. So the selection of the best service composition is a complex problem and it faces trade-off among various QoS criteria. In this paper, we propose a Cloud service composition approach based on evolutionary algorithms, i.e., NSGA-II and MOPSO. We utilize the combination of multi-objective evolutionary approaches and Decision-Making method (AHP) to solve Cloud service composition optimization problem. The weights generated from AHP are applied to the Crowding Distance calculations of the above two evolutionary algorithms. Our algorithm beats single-objective algorithms on the optimization ability. And compared with general multi-objective algorithms, it is able to precisely capture the users' preferences. The results of the simulation also show that our approach can achieve a better scalability.

• 융합보안논문지
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• 제8권2호
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• pp.7-13
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• 2008

국내외적으로 보안제품 평가를 위해서 공통평가기준(CC)을 제정하여 제품을 평가한다. 이와 같은 기준은 제품의 복잡성과 함께 버전이 변화되어 제품 평가의 기준을 확대하고 있다. 하지만 개발자 입장에서 제품을 설계할 때 보안성 평가 지침에 적합한 형태로 접근하기가 매우 어렵다는 문제점이 있다. 이는 개발자에게 제시되는 평가기준이 불명확하기 때문이다. 이에 본 연구에서는 개발자를 위한 합성제품 평가 지침을 제시함으로써 정보보안 제품을 설계단계에서부터 보안 제품 기준을 명확히 도입할 수 있도록 방안을 제시하고자 한다.

• Environmental Engineering Research
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• 제12권5호
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• pp.203-210
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• 2007

Since the emissions composition from the household products have potentially been associated with health risks for building occupants, the chemical composition emitted from the products should be surveyed. The current study identified the emission composition for 42 liquid household products, using a purge-and-trap method. This evaluation was done by classifying the household products into five product classes (deodorizers, household cleaners, color removers, pesticides, and polishes). Nineteen compounds were chosen on the basis of selection criteria. The quality control program for purge-and-trap and analytical systems included tests of laboratory blank Tenax traps and blank water samples, and the determination of calibration equation, measurement precision, method detection limit (MDL), and recovery. The number of chemicals varied according to the product categories, ranging from 4 for the product category of bleaches to 12 for the product categories of air fresheners and nail color removers. For all product categories, the emission composition and concentrations varied broadly according to product. It is noteworthy that most household products emit limonene: 19 of 25 cleaning products; 5 of 6 deodorizers; 1 of 3 pesticides; 3 of 3 color removers; and 4 of 5 polishes. It was suggested that the use of household products sold in Korea could elevate the formation of secondary toxic pollutants in indoor environments, by the reaction of limonene with ozone, which entered indoor environments or might be generated by indoor sources such as electronic air cleaning devices and copying machines.

• Journal of Microbiology and Biotechnology
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• 제28권9호
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• pp.1502-1510
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• 2018

Organic solvent-tolerant (OST) enzymes are widely applied in various industries for their activity and stability in organic solvents, for their higher substrate solubility, and for their greater stero-selectivity. However, the criteria for identifying OST enzymes largely remain undefined. In this study, we compared the amino acid composition of 19 OST esterases with that of 19 non OST esterases. OST esterases have increased the ratio of Ala and Arg residues and decreased the ratio of Asn, Ile, Tyr, Lys, and Phe residues. Based on our amino acid composition analysis, we cloned a carboxylesterase (EstSP2) from a psychrophilic bacterium, Sphingomonas glacialis PAMC 26605, and characterized its recombinant protein. EstSP2 is a substrate specific to p-nitrophenyl acetate and hydrolyzed aspirin, with optimal activity at $40^{\circ}C$; at $4^{\circ}C$, the activity is approximately 50% of its maximum. As expected, EstSP2 showed tolerance in up to 40% concentration of polar organic solvents, including dimethyl sulfoxide, methanol, and ethanol. The results of this study suggest that selecting OST esterases based on their amino acid composition could be a novel approach to identifying OST esterases produced from bacterial genomes.

• 동력기계공학회지
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• 제13권1호
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• pp.19-25
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• 2009

This paper is a study on the link composition design of a double link type level luffing jib crane using path generation synthesis passing through three precision points according to parameters, the length of backstay, the ratio of fly jib length between two moving hinges to the total length of fly jib, the location of a intermediate passing point etc. when the maximum and minimum working radius of the crane are given. The performance of the crane depends on the deviation of the luffing trajectory at fly jib tip. The luffing trajectories according to the above parameters are analyzed and shown in graphs by the developed computer program. In a real-life design, some trials are needed to arrive at a proper link composition design. Therefore, it is expected that the present computer program can rapidly and exactly deal with a link composition design proper to the design criteria of the crane.

• 정보처리학회논문지D
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• 제16D권5호
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• pp.737-746
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• 2009

SOA의 출현은 비즈니스 및 IT 환경에 많은 영향을 주었고 학계 및 산업에서 많은 연구가 진행 중이다. 향후 서비스는 폭발적으로 증가할 것이며, 서비스를 컴포지션하여 비즈니스 기회를 창출하고 IT는 이를 지원할 것이다. 그러나 컴포지션의 대상이 되는 서비스를 선정하는 연구는 부족한 실정이다. 본 연구는 서비스 컴포지션 대상을 선정하는 프레임워크를 제안하는 것이며, 선정 방법으로는 Analytic Hierarchy Process 기법을 활용한다. 본 연구의 결과는 서비스 조합시 서비스의 기능/비기능 속성을 반영하고 다양한 이해당사자의 관점과 다수 선정 기준을 적용 하여 서비스 선정을 가능하게 하였다.

• 의료ㆍ복지 건축 : 한국의료복지건축학회 논문집
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• 제9권2호
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• pp.7-16
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• 2003

Terminal cancer patients in Korea have increased due to the development of medical technology and the structural change of diseases resulted from life quality improvement. Following this trend, many hospitals are making efforts, such as renovating hospice wards, but architectural criteria are not sufficiently suggested for specialized hospice wards. The purpose of this study is to present the research data to improve the quality of hospice ward in general hospital. Data collecting skills such as drawing documents analysis, interviews, observation were used to examine the condition of hospice ward. And, case study method was used to generate the design data which can be used for the appropriate spatial composition and the area calculation.

• 융합보안논문지
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• 제7권3호
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• pp.45-50
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• 2007

침입차단시스템 및 침입탐지시스템 등의 정보보호제품에 대한 안전성과 관련하여 좀더 강화를 목적으로 한 합성정보보호제품의 경우 인터페이스에서의 취약성과 안전성의 정도 및 개발기간과 개발비용의 정도가 고려시 되고 있는데, 본 논문에서는 이러한 합성 TOE의 대한 평가범위분석을 ISO/IEC TR 19791을 기준으로 함으로써 각 도메인의 범위를 파악하기에 충분하였다. 합성 ST의 보안환경과 보안목적 작성시 보안정책 수립 측면에서 큰 도움이 될 수 있다고 생각한다.

• 한국정밀공학회지
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• 제15권6호
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• pp.79-89
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• 1998

In determining optimal cutting condition for face milling operation, tool wear is an important factor. For the purpose of establishing the relationship between various machining factors and tool wear, cutting tests have been performed. As a result, hardness and chemical composition of workpiece material, chemical composition and grain size of cutting tool and cutting speed have been selected as machining factors. In addition, relationship between feed rate and workpiece hardness has been observed. Prior to utilizing cutting conditions recommended by ‘Machining Data Handbook(MDH)’ as a knowledge base, an analysis for the validity of the MDH has been provided. Based on this analysis, tool life criteria applied by MDH has been modified. Finally, using MDH recommended data for neural network trainning, the results from the trained neural network for optimal cutting condition for some given workpiece and cutting tool can be used as reference cutting conditions.

• 의료ㆍ복지 건축 : 한국의료복지건축학회 논문집
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• 제11권1호
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• pp.23-31
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• 2005

Rehabilitation medicine patients in Korea have increased due to the development of medical technology and the structural change of diseases resulted from life quality improvement. Following this trend, many hospitals are making efforts, such as renovating rehabilitation medicine, but architectural criteria are not sufficiently suggested for specialized rehabilitation medicine. The purpose of this study is to present the research data to improve the quality of rehabilitation medicine in general hospital. Data collecting skills such as drawing documents analysis, interviews, observation were used to examine the condition of rehabilitation medicine. And, case study method was used to generate the design data which can be used for the appropriate spatial composition and the area calculation