• 한국환경생태학회지
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• 제25권3호
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• pp.302-306
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• 2011

2006년부터 2009년 말까지 월악산에 서식하는 산양의 겨울철 배설물을 관찰한 결과, 배설물 속에 헛개나무 종자가 포함되어 있었고, 봄철에 그 배설물에서 헛개나무 종자가 발아하는 것을 확인하였다. 산양이 헛개나무 종자의 발아에 미치는 영향을 살펴보기 위하여 동일 시기 및 장소에서 산양의 배설물 속에서 수집한 헛개나무 종자 600개와 산양이 먹지 않은 종자 600개를 포트에 심어 비교, 관찰하였다. 그 결과, 산양 배설물 속에서 추출한 헛개나무 종자는 발아율이 32.5%였으나, 산양이 먹지 않은 종자는 발아율이 0.8%로 나타났다. 산양 서식지에서 산양이 먹이원으로 섭취하는 헛개나무 종자는 산양이 서식하지 않는 지역보다 40배 정도 발아율이 높은 것으로 확인되었다.

• 한국콘텐츠학회논문지
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• 제13권7호
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• pp.333-338
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• 2013

본 연구의 목적은 해외 치과기공물 서비스 수출을 연구하는 것으로서, 우리나라 및 해외 치과기공물 서비스의 현황분석, 그리고 해외 진출 시 문제점과 진출 전략을 제시하였다. 세계화와 정보화 추세의 진전으로 의료서비스시장 규모가 점점 커지고 있으며, 의료 서비스시장은 질이 가장 중요시 되는 고부가가치의 서비스산업이라는 새로운 인식하에 시장 개발과 고용창출을 이루려는 각국의 노력과 함께 급부상하며 유망산업분야로 떠오르고 있다. 고부가가치의 의료서비스 산업을 해외 시장으로 확장 발전시키기 위하여, 결론적으로 첫 번째 의료서비스의 해외진출과 글로벌화 강화, 두 번째는 전문화를 통한 의료서비스의 고급화, 마지막으로 전문경영체제 구축 및 의료 서비스 시스템 혁신이 필요하다.

• 한국환경생태학회지
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• 제30권5호
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• pp.865-873
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• 2016

지리산국립공원 반달가슴곰은 2004년부터 러시아 연해주, 북한, 중국 동북부 일대와 서식지외 보전기관인 서울대공원에서의 재도입을 통해 복원사업을 진행하고 있다. 본 연구의 목적은 배설물을 통해 식이물을 분석하여 반달가슴곰의 먹이습성, 지리산국립공원에서의 먹이 자원 환경을 파악하기 위함이다. 2005년부터 2013년 사이에 무선 위치 모니터링이 가능한 반달가슴곰 배설물 78점을 채집하여 먹이원을 분석한 결과 상대출현빈도는 식물이 77%로 가장 높게 나타났고, 곤충 12.8%, 포유류 5.6%, 기타 3.6%, 조류 0.5%, 절지동물문 0.5%의 순이었다. 또한 수집한 배설물 중 건중량을 측정한 52점 대상으로 먹이 비(ratio)를 분석한 결과 식물이 91.2%로 가장 높게 나타났으며, 포유류 3.6%, 곤충류 1.0%, 기타 4.2%의 순이었다. 배설물을 통한 먹이원 분석 연구 결과 지리산에 서식하는 반달가슴곰은 잡식성이며, 동물성 먹이보다 식물성 먹이가 주 먹이원인 것으로 확인할 수 있었다.

• 한국통신학회논문지
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• 제25권5B호
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• pp.850-858
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• 2000

최근 통신망의 규모가 커지고 대역폭이 증가됨에 따라서 통신망에 요구되는 신뢰도가 증가하게 되었다. 통신망에 있어서 대체 경로의 지정은 통신망의 장애 발생으로부터 통신망을 보호하는데 필수적이다. 본 논문에서는 다양한 서비스들이 가지는 상이한 트래픽 파라메터와 QoS(Quality of Service)를 제공하고 통신망의 관리를 용이하게 하기 위해서 동일한 물리매체 위에 ATM 베어러 서비스 유형(CBR, rt-VBR, nrt-VBR, ABR, UBR)에 따라 논리적으로 구분된 통신망을 구성한다. 또한 사용중인 노드 또는 링크에 장애가 발생했을 때, 보다 바른 자동복구를 위해서 대체경로를 이용한 자동북구 방법을 사용하고, TINA 기반의 장애관리 기능을 사용하여 초고속 통신망에 적합한 자동복구 방법을 제안한다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2000년도 하계학술대회 논문집 A
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• pp.537-540
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• 2000

The Distribution System consist of many tie-line switches and sectionalizing switches, operated a radial type. When an outage occurs in Distribution System, outage areas are isolated by system switches, has to restored as soon as possible. At this time, system operator have to get a information about network topology for service restoration of outage areas. Therefore, the searching result of restorative topology has to fast computation time and reliable result topology for to restore a electric service to outage areas, equal to optimal switching operation problem. So, the problem can be defined as combinatorial optimization problem. The service restoration problem is so important problem which have outage area minimization, outage loss minimization. Many researcher is applying to the service restoration problem with various techniques. In this paper, advanced Dijkstra algorithm is applied to searching a restoration topology, is so efficient to searching a shortest path in graph type network. Additionally, fuzzy rules and operator are applied to overcome a fuzziness of correlation with input data. The present technique has superior results which are fast computation time and searching results than previous researches, demonstrated by example distribution model system which has 3 feeders, 26 buses. For a application capability to real distribution system, additionally demonstrated by real distribution system of KEPCO(Korea Electric Power Corporation) which has 8 feeders and 140 buses.

• 대한전기학회논문지:전력기술부문A
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• 제50권2호
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• pp.76-82
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• 2001

This paper presents a approach for a service restoration and optimal reconfiguration of distribution network using Genetic algorithm(GA) and Tabu search(TS) method. Restoration and reconfiguration problems in distribution network are difficult to solve in short times, because distribution network supplies power for customers combined with many tie-line switches and sectionalizing switches. Furthermore, the solutions of these problems have to satisfy radial operation conditions and reliability indices. To overcome these time consuming and sub-optimal problem characteristics, this paper applied Genetic-Tabu algorithm. The Genetic-Tabu algorithm is a Tabu search combined with Genetic algorithm to complement the weak points of each algorithm. The case studies with 7 bus distribution network showed that not the loss reduction but also the reliability cost should be considered to achieve the economic service restoration and reconfiguration in the distribution network. The results of suggested Genetic-Tabu algorithm and simple Genetic algorithm are compared in the case study also.

• 한국환경복원기술학회지
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• 제24권4호
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• pp.47-60
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• 2021

This study was conducted to classify quality attributes for quality elements of public service targeting Gochang Jayeonmadang and analyze their impact on resident satisfaction and dissatisfaction by each service quality element by using the Kano model and the customer satisfaction coefficient and dissatisfaction coefficient of Timko(1993). As a result of the study, all 20 quality elements of public service were classified as one-dimensional attributes. Since the Jayeonmadang project restores the damaged natural environment and restores the ecosystem, it is judged that satisfaction is proportionately satisfied as the natural environment has been restored and the ecosystem has been restored. According to Timko (1993)'s analysis of customer satisfaction coefficient, it is believed that the most effective way to improve residents' satisfaction is to carefully establish and implement maintenance plans and to create a good environment to ensure that plants have settled.

• 한국환경생태학회지
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• 제29권2호
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• pp.184-191
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• 2015

This study aimed to analyze characteristics of the seasonal habitat use of reintroduced Long-tailed Gorals (n=7) in Woraksan (mountain) National Park. We collected 10,721 goral coordinates in Woraksan (mountain) National Park via transmitters, and analyzed habitat use (e.g., aspect, distance from stream and road) from November 2006 to January 2013. Aspect use was southwest (22.6 %), and seasonal aspect use had a southwestern slope (in the spring, summer, and autumn). A northwestern aspect was detected in winter, but slope of $30^{\circ}{\sim}35^{\circ}$ (19.0 %) was used regardless of the season and mean elevation use was 500 m. Moreover, seasonal use was higher in the summer and lower in the winter and spring. The distance from the stream was mainly 50 m in 17.2 %, except in the winter (distance of 300 m), and it was within 50 m in the spring, summer, and autumn. The distance from the road was 100 m in 25.7 %, and seasonal use was within 100 m except for the winter. Thus, we examined significant differences in the habitat use of reintroduced gorals in Woraksan (mountain), and provide elementary data for habitat stabilization of Woraksan (mountain) National Park where goral restoration has advanced.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2000년도 하계학술대회 논문집 A
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• pp.159-161
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• 2000

This paper presents a GA for service restoration in electric power distribution systems. The aim of the service restoration is to restore service with maximizing the amount of total load restored while minimizing the number of required switch operation when a fault or overload occurs in distribution system. This paper develops GA for service restoration problem with constrained multi-objective optimization problem. The results show the effectiveness of the proposed method for solving the problem.

• ETRI Journal
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• 제32권2호
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• pp.241-247
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• 2010

We propose and experimentally demonstrate a service-aware optical transport system. The proposed service-aware optical transport system makes a flow based on service type and priority of traffic. The generated flow is mapped to a corresponding sub-${\lambda}$ for transport over an optical network. Using sub-${\lambda}$ provided by the centralized control plane, we could effectively provide quality-of-service guaranteed Ethernet service and best-effort service simultaneously in a single link. The committed information rate (CIR) traffic and best-effort traffic are assigned to different sub-${\lambda}s$. The bandwidth of the CIR traffic is guaranteed without being affected by violation traffic because the bandwidth is managed per each sub-${\lambda}$. The failure detection time and restoration time from a link failure is measured to be about 60 ${\mu}s$ and 22 ms, respectively, in the ring network. The measured restoration time is much smaller than the 50 ms industry requirement for real-time services. The fast restoration time allows the proposed service-aware optical transport system to offer high availability and reliability which is a requirement for transport networks.