• 한국산림과학회지
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• 제100권1호
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• pp.62-69
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• 2011

본 연구는 5차 국가산림자원조사(National Forest Inventory, NFI) 표본점 자료를 이용하여 충청도 지역에 분포하는 주요 수종에 대한 수고-흉고직경 생장모델을 개발하고자 하였다. 충청도 지역 고정표본지 내에서 수고와 흉고직경이 측정된 주요 수종의 총 임목 본수는 2,681본이었으며, 무작위로 생장모델의 개발을 위해 90% 자료와 모델 타당성 검정을 위해 10% 자료로 나누어서 분석하였고, 본 연구에서 제시된 최종모형의 추정된 계수는 100% 자료를 이용하였다. 8개 주요 수종에 대한 생장모델들의 적합성 검정은 결정계수($R^2$), 추정치의 오차인 평균제곱근오차(RMSE), 평균편의(MD), 절대평균편의(AMD)와 직경급별로 평균편의(MD)를 비교 분석하였다. 본 연구 결과에 의하면, 6개 주요 생장식의 결정계수는 모두 94% 이상의 높은 설명력을 나타냈으며, 특히 C-R 생장모델과 Weibull 생장모델은 다른 모델에 비해 좋은 결과를 나타냈다. 직경급 30 cm 이하에서는 소나무, 리기다소나무, 굴참나무, 신갈나무가 상대적으로 가장 작은 평균편의를 나타낸 반면, 직경급 30 cm 이상에서는 신갈나무, 상수리나무, 졸참나무가 큰 평균편의를 나타냈다. 또한 본 연구의 결과로 제시된 6개 주요 생장식에서 추정한 수고를 임목자원평가 프로그램에 적용하여 간재적을 분석한 결과, 직경급 30 cm까지는 큰 차이를 보이지 않지만, 30 cm 이상인 대경목의 경우 추정된 간재적은 큰 차이를 보이므로, 생장모델 선정에 주의를 기울여야 한다.

• 환경영향평가
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• 제7권1호
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• pp.49-61
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• 1998

Zoning areas within national parks in Korea are classified into Natural Preservation Zone(NPZ). Natural Environment Zone(NEZ), Settlement Zone(SZ) and Mass Facility Zone(MFZ) based on the Natural Park Act Large-scale development which might cause permanent destruction of natural resources are being done in NEZ which covers 90% of the total natural park area. Thus it is necessary to examine National Park Act which refers the authorized criteria and development activities of NEZ. However, the current environmental impact statement(EIS) does not cover the full impact of the development inside the national park area. Based on these concepts, the study examines the appropriate resources to distinguish the NPZ and NEZ in Mt. Teogyu National Park, then compare the distribution of resource characteristics between two area by using GIS. Through this study, the conclusions are as follows; (1) In terms of scenic resource analysis, the current NPZ does not meet the criteria on the National Park Act Rather, most of the resources which should be located within the NPZ are located within the NEZ. (2) In terms of elevation analysis, Mt. Teogyu National Park, most of NPZ are located on high altitude which is more than l,200m above the mean sea level. Therefore, it shows the elevation is the only criteria for distinguishing NPZ and NEZ. (3) In terms of Degree of Green Naturality(DGN), the second forest areas, the eighth grade of DGN in Mt. Teogyu National Park are distributed much more in the NEZ than NPZ. (4) After examining five factors - scenic resources, elevation, slope and DGN, vegetation- it was found out that zoning of Mt. Teogyu National Park is not adequatly designated. Zoning of national parks should be accomplished based on the precise inventory of the current resources.

• 한국콘텐츠학회논문지
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• 제21권5호
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• pp.84-93
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• 2021

장비마다 내구연수가 존재한다. 장비의 도입, 운영 그리고 폐기까지 상태가 변하기도 하고 장애가 발생할 수도 있다. 이러한 장비들을 기관마다 상당 양을 보유하고 있으며 장비마다 일일이 이슈를 파악하고 있는 일은 어려운 일이다. 그렇기 때문에 단순 재고 파악 목적만이 아닌 장비의 체계적인 Life Cycle 관리가 더욱 필요하다. 본 논문에서는 정보자원을 대상으로 통합 관리 시스템을 설계하고 구현한다. 제안하는 시스템은 인터넷을 사용할 수 있는 환경이라면 PC, 태블릿, 스마트폰 등을 통해 전산화된 정보 자원 데이터에 쉽고 간편하게 접근할 수 있도록 구현한다. 또한 중앙 집중식 관리와 사용자 레벨별 권한 부여 방식을 통해 상위 기관과 하위기관에서의 기능을 제한하고, 전체적인 자원의 현황을 파악할 수 있도록 통합 관리 체계를 구현한다.

• 한국경영과학회:학술대회논문집
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• 한국경영과학회/대한산업공학회 2005년도 춘계공동학술대회 발표논문
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• pp.715-722
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• 2005

Disassembly scheduling is the problem of determining the quantity and timing of disassembling used products while satisfying the demand of their parts or components over a planning horizon. The case of single product type with assembly structure is considered for the objective of minimizing the sum of disassembly operation and inventory holding costs. In particular, the resource capacity constraint is explicitly considered. The problem is formulated as an integer programming model, and a two-stage heuristic with construction and improvement algorithms is suggested in this paper. To show the performance of the heuristic, computational experiments are done on a number of randomly generated problems, and the test results show that the algorithm can give near optimal solutions within a very short amount of computation time.

• 한국조경학회지
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• 제19권1호
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• pp.19-29
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• 1991

This second stage study on the Wild and Scenic Rivers System is a proposal for system disignation. Study area is the part of the Han River flowing through the Seoul Metropolitan Region. Consequently, developpment pressure and demand for recreational land uses along the river are very high, and that is why the Wild and Scenic rivers System is urgently needed for the Han River among other major rivers of the nation. Resource inventory and assessment followed the process developed in the first stage study. Figure-4 shows the proposed Wild and Scenic Rivers System designation, Also proposed are manage-ment guidelines and legal, organizational arrangement.

• Management Science and Financial Engineering
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• 제12권1호
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• pp.95-112
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• 2006

Disassembly scheduling is the problem of determining the quantity and timing of disassembling used or end-of-life products while satisfying the demand of their parts and/or components over a planning horizon. The case of assembly product structure is considered while the resource capacity constraints are explicitly considered. A cost-based objective is considered that minimizes the sum of disassembly operation and inventory holding costs. The problem is formulated as an integer programming model, and a two-stage heuristic with construction and improvement algorithms is suggested in this paper. To test the performance of the heuristic, computational experiments are done on randomly generated problems, and the results show that the heuristic gives near optimal solutions within a very short amount of computation time.

• 경영과학
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• 제30권3호
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• pp.71-79
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• 2013

This paper investigates and selects the areas that need to be improved in R&D and production management of small and medium size companies. The study on the capability of R&D and production management shows that the areas for evaluating of the R&D and production management levels are composed of 8 elements : R&D resource, R&D support and experience, long-term operations strategy, intermediate range planning, short-term planning, subcontractor management, logistics and inventory management, and quality management. The investigation of the gap between the importance of the areas and the capability of SMEs shows that the most important things are to consolidate supply chain, to improve product and process competitiveness using quality improvement, and to enhance production management through sophisticated short-term planning. The detailed analysis also shows that the areas that need to be improved depend on the size and sales of the company.

• 한국산업정보학회:학술대회논문집
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• 한국산업정보학회 1999년도 춘계학술대회 발표논문집
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• pp.30-35
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• 1999

Recently, many companies want to accept and operate ERP(Enterprise Resource Planning) system in their fields ERP does not only include business, but also include finance, account, trade, personnel and BPR(Business Process Reengineering). Especially, it is necessary to have ERP system for companies which have lots of external businesses such as trade and communication sector. In modern society, the manufacture field faces on variable chances of Environment. For this situation, the application of Information technique is one of the main point maintain competitive power. The company should chose a proper method for their future and build Unified Information System on its suitable situation. Nowadays, Adjustment and application of technical method for Internet/Intranet and raised and more advanced Extranet gains its force at the moment. The Unification of ERP and POP system under the distributed environment like this will have a huge influence to us. In this subject, I will think about POP system for operating EPR system and improve its defects that can operate more effective sales, circulation, demand plan. Also, I suggest a proper POP system can handle seperated resources in each part of factory for a plan of shot period, order operating, factory inventory, process control.

• 대한안전경영과학회지
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• 제6권3호
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• pp.131-140
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• 2004

The company was focusing on production which was partial mission rather than acquiring the information of customer in intensive process industry. The company accepted loss which is from over-production, losing of opportunity. After changing to web environment, supply chain is more complicated and need of customer is more various. As a result the company hard works on controlling production rates, production quantities in production area and gathering exact information which is about available resource and available quantities. Cooperated demand planning have to get decreasing of inventory, improving of customer service in supply chain management. Specially demand planning that considers allocation of capacity is executed in Iron-Industry. Demand planning must be classified by customer, region and supply position level.

• 대한안전경영과학회:학술대회논문집
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• 대한안전경영과학회 2003년도 추계학술대회
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• pp.151-160
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• 2003

The company was focusing on production which was partial mission rather than acquiring the information of customer in intensive process industry. The company accepted loss which is from over-production, losing of opportunity. After changing to Web environment, supply chain is more complicated and need of customer is more various. As a result the company hard works on controlling production rates, production quantities in production area and gathering exact information which is about available resource and available quantities. Cooperated demand planning have to get decreasing of inventory, improving of customer service in supply chain management. Specially demand planning that considers allocation of capacity is executed in Iron-Industry. Demand planning must be classified by customer, region and supply position level.