• Management & Information Systems Review
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• v.32 no.3
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• pp.107-125
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• 2013

This study deals with a strategic decision making in two level supply chain network design. This study presents more realistic mathematical model than the previous studies by considering simultaneous location of plants and distribution centers, determination of capacity level for both plants and distribution centers, and upper limit condition for numbers of locating plants and distribution centers. This paper tries to help the strategic decision making for two level supply chain network design. For this purpose, three different sized numerical examples are generated and optimal solutions are obtained by applying Excel Solver program. And sensitivity analysis is performed for the biggest sized example problem, which has 10 potential plants, 20 potential distribution centers, and 200 customer zones. After the plants being located are fixed, optimal minimum costs are obtained and compared for each of 7 different numbers of distribution centers to be located. As the number of distribution centers increases, changes in inbound transportation cost and outbound transportation cost can be derived. In case of considering cost as well as customer satisfaction level for two level supply chain network design, the analysis of this changes may help more sophisticated decision making.

• Journal of Navigation and Port Research
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• v.45 no.1
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• pp.26-32
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• 2021

In ocean field, the spread of the Fourth Industrial Revolution based on information and communication technology requires high precision and stable PNT&D (Position, Navigation, Timing and Data). As the IMO (International Maritime Organization) and IALA (The International Association of Marine Aids to Navigation and Lighthouse Authorities) are requiring backup systems due to mitigate vulnerabilities and the increase of dependency on GNSS (Global Navigation Satellite System), Korea is conducting a research & development of R-Mode. An DGPS (Differentiate Global Positioning System) reference station that uses MF, an existing maritime infrastructure, and AIS (Automatic Identification System) base stations that use 34 integrity station and VHF will be utilized in this study to avoid redundant investment. Because there are radio shadow areas that display low signal levels in the west sea, the establishment of new R-Mode reference and integrity station will be intended to resolve problems regrading the radio shadow area. Because the frequency has a characteristic in that radio wave transmits well along the ground (water surface) in low frequency band, simulation and measurement were conducted therefore this paper to propose candidate sites for R-Mode reference and integrity station resulted through p wave's propagation characteristics analysis. Using this paper, R-Mode reference and integrity station can be established at appropriate locations to resolve radio shadow areas in other regions.

• Korean Journal of Remote Sensing
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• v.27 no.1
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• pp.43-49
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• 2011

In the face of growing concern about global warming, increasing attention has been focused on the reduction of carbon dioxide emissions. One method to mitigating the release of carbon dioxide is Carbon Capture and Storage (CCS). CCS includes separation of carbon dioxide from industrial emission in plants, transport to a storage site, and long-term isolation in underground. It is necessary to conduct analyses on optimal site selection, surface monitoring, and additional effects by the construction of CCS facility in Gyeongsang basin, Korea. For the optimal site selection, necessary data; geological map, landcover map, digital elevation model, and slope map, were prepared, and a weighted overlay analysis was performed. Then, surface monitoring was performed using high resolution satellite image. As a result, the candidate region was selected inside Gyeongnam for carbon storage. Finally, the related regulations about CCS facility were collected and analyzed for legal question of selected site.

• Journal of KIISE:Software and Applications
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• v.37 no.2
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• pp.95-103
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• 2010

Improving the competitiveness of software products in the market involves procuring the means to design software architecture that deliver qualities necessitated by stakeholder requirements within allocated budget, thereby improving the cost-effectiveness of the end product. Currently, software architecture evaluation methods are used to predict and review qualities inherent in software architecture designs and to choose a candidate architecture that delivers desired qualities. Existing software architecture evaluation methods, however, fail to address the cost considerations dependent on the architecture chosen for product implementation. In this paper we suggest a cost estimation method for software architecture which adapts the cost drivers in the software cost estimation model COCOMO II to support cost estimation during architecture evaluation. The suggested method can be performed in coordination with existing software architecture evaluation efforts and supplements existing architecture evaluation techniques with guidelines for identifying and evaluating cost drivers in candidate software architectures without incurring extra overhead. The accuracy of the cost estimation using the suggested method is verified through application of the method to the architecture candidates used in RPS (Robot Patrol System), a surveillance embedded system.

• Journal of Korean Society for Geospatial Information Science
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• v.20 no.4
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• pp.3-9
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• 2012

The exhaustion of fuel and tremendous greenhouse gas emissions are caused by the sharp increase in the use of fossil fuel. Especially, accounting for over 25% of carbon dioxide emissions, Construction is main environmental problem. So, in this study, we applied network analysis in the selection of spoil-bank to reinforce the GIS to decrease carbon dioxide emissions in construction sites. As a result, we could calculate the expected carbon dioxide emission and transportation cost of the proposed sites by the shortest distance and the least amount of time. We found that if spoil-bank is chosen based on the result, carbon dioxide emissions will be decreased as much as we plant a pine tree. We can also decrease largely by considering and applying complex causes which affect carbon dioxide emissions in construction.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.41 no.1
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• pp.70-78
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• 2013

Before GBAS ground systems is installed at the airport, the site survey is needed to determine the suitability of proposed GBAS candidate sites depending on the siting requirements. Therefore, analysis of GPS signal reception environment, one of the site survey steps, is required. In this paper, the number of visible satellites, GPS signal strength, multipath error, radio frequency interference and predicted availability were analyzed using the GPS data of Gimpo International Airport measured by PortaSAT equipments and the analysis results were represented.

• The Transactions of the Korea Information Processing Society
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• v.5 no.6
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• pp.1552-1562
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• 1998

형태소 분석(Morphological Analysis)과 같은 언어학적 처리에 의존하는 기존의 한국어 문헌에 대한 자동색인 기법들은 품사의 애매모호함이나 복합명사의 처리 등으로 부담(overhead)이 크다. 또한 불용어 처리에 사용되는 불용어 리스트가 대상 문헌의 주제 분야별로 따로 구축되어야 하며 그 크기가 방대하다는 문제점이 있다. 이러한 문제점들을 해결하기 위해, 본 논문에서는 각 문헌의 텍스트에 대해 복합명사 처리나 애매모호함에 대한 엄격한 분석을 수행하지 않는 간단한 형태의 형태소 분석을 수행하여 단순명사들을 추출한다. 그런 후 이들 단순명사들을 이용하여 유한 오토마타(Finite Automata)를 구성하고, 구성된 유한 오토마타와 각 명사의 단어빈도(Term Frequency)에 의해 각 색인어 후보들의 중요도를 계산하는 자동색인 기법을 제안한다. 그 결과 품사의 애매모호함에 대한 처리나 복합명사의 처리에따른 부담을 줄일 수 있었으며, 선정된 색인어들과 수작업으로 선정한 색인어들의 비교 실험에 의해 제안한 자동색인 기법의 성능을 검증하였다.

• Digital Contents
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• no.5 s.132
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• pp.63-69
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• 2004

정보통신부가 주최하고 한국소프트웨어진흥원과 한국데이터베이스진흥센터가 공동으로 주관하는 2004년 디지털콘텐츠 대상 1분기 수상작이 결정됐다. 디지털영상, 온라인게임, 교육용콘텐츠, 무선콘텐츠, 웹정보콘텐츠 등 4개 부문 총 5개 작품이 선정된 이번 1분기 디지털콘텐츠 대상 수상작들은 전분야에 걸쳐 우수한 작품들이 제출되 심사과정에서도 고민이 있었다는 후문이다. 수상작들을 살펴보면 디지털영상 분야에서는 이매진하이의 트라이킹덤이 수상의 영예를 안았고, 온라인 게임 분야에서는 재미 인터렉티브의 '트라비아 온라인'과 엔트리브소프트 '팡야'가 공동으로 선정됐다. 교육콘텐츠에서는 와이즈캠프닷컴의 '와이즈캠프'가 수상했고, 모바일콘텐츠분야에서는 엔텔리젼트의 '삼국지 무한대전'이 차지했다. 이와 함께 웹정보 콘텐츠 분야에서는 북코스모스의 '국내외 북다이제스트'가 대상을 차지했다. 이번 디지털콘텐츠 대상 수상업체들은 향후 정보통신부의 해외 진출과 마케팅을 위한 각종 활동에 우선적으로 참가하는 혜택을 누릴 수 있으며, 연말에 열리는 디지털콘텐츠페어 2004전시회에 참가하고, 대통령상 후보에 오르는 자격을 얻게 된다.

• Korean Journal of Soil Science and Fertilizer
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• v.43 no.6
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• pp.1024-1034
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• 2010

In order to select the demonstration farm site for agricultural investment by Korean fund, 14 sites were investigated by soil morphological characteristics and were evaluated by rating method in the Oudomxai province of Laos. Land evaluation was carried out by using eight factors, such as site accessibility, soil erosion susceptibility, easiness of farm mechanization, irrigation water obtainability, suitability of soil physical and chemical properties for crop growth, cost for establishment of farm foundation and land obtainability. In addition, one site to have been highly ranked was soil physico-chemically studied for farm planning. The site of heavy clayey soil has hydraulic conductivity of 26.27~40.64 cm $day^{-1}$, organic content of lower than 14 g $kg^{-1}$, available phosphate content of lower than 3 mg $kg^{-1}$, exchangeable cations of lower than 0.38, 11 and 3.1 cmolc $kg^{-1}$ in K, Ca and Mg, respectively. Major important limitations for establishment of demonstration farm were concluded as heavy soil-texture, high soil erodibility, low organic matter and phosphate contents, and insufficient irrigation water in the Oudomxai province of Laos.

• Journal of KIISE:Software and Applications
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• v.29 no.8
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• pp.595-603
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• 2002

Only a few studies have been conducted on how to select multiple classifiers from the pool of available classifiers for showing the good classification performance. Thus, the selection problem if classifiers on how to select or how many to select still remains an important research issue. In this paper, provided that the number of selected classifiers is constrained in advance, a variety of selection criteria are proposed and applied to tile construction of multiple classifier systems, and then these selection criteria will be evaluated by the performance of the constructed multiple classifier systems. All the possible sets of classifiers are trammed by the selection criteria, and some of these sets are selected as the candidates of multiple classifier systems. The multiple classifier system candidates were evaluated by the experiments recognizing unconstrained handwritten numerals obtained both from Concordia university and UCI machine learning repository. Among the selection criteria, particularly the multiple classifier system candidates by the information-theoretic selection criteria based on conditional entropy showed more promising results than those by the other selection criteria.