• Proceedings of the Korea Water Resources Association Conference
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• 2021.06a
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• pp.445-445
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• 2021

대구시민의 삶의 질 향상에 크게 기여하는 신천은 홍수, 친수 및 하천환경 관리에 대한 필요성이 증가되는 상황에서 신천 복원을 위하여 하천횡단구조물 및 생태조사가 필요한 실정이다. 신천 내에 위치하고 있는 14개의 하천횡단구조물은 신천의 흐름을 가로막고 있어 수질악화 및 생물이동을 저해하고 있으며, 집중호우 등으로 인하여 구조물 주변에 대한 하천관리가 어려운 것이 현실이다. 특히 신천은 인구가 밀집해 있는 도심을 관통하는 하천으로 친수공간, 홍수 및 하천환경 관리에 대한 필요성이 증가하고 있다. 본 연구에서는 신천의 수질과 어류의 생태성의 상관관계를 확인하고 횡단구조물에 대한 해결방안을 제시하고자 한다. 현지조사 결과 총 3목 6과 10종의 어류가 관찰되었으며, 법정보호종인 멸종위기 야생생물 및 천연기념물은 관찰되지 않았으나, 고유종으로 긴몰개와 참갈겨니, 꺽지, 동사리 4종이 출현하였으며, 환경부 지정 생태계교란 생물 블루길 1종이 관찰되었다. 이러한 결과를 바탕으로 어류생물지수(FAI)를 검토하였을 때, 하류지역으로 갈수록 E등급으로 매우 나쁨의 환경상태를 나타내었다. 이는 상류에서 하류로 갈수록 비정상개체수가 증가하고 하상의 단순화 및 유기물의 축적으로 출현 종수의 감소에 따른 결과로 판단된다. 이러한 결과를 바탕으로 신천의 평균 FAI 지수는 14.71점으로 E등급의 매우 나쁨의 환경상태를 나타내는 것으로 분석되었다.

• Journal of Environmental Impact Assessment
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• v.27 no.2
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• pp.114-123
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• 2018

For conservation of biodiversity, we designate and manage the major areas that are habitats of organisms as ecosystem protected areas. It is necessary to evaluate the biodiversity of protected areas relatively in order to establish strategies to protect and secure the biodiversity of protected areas. In this study, we selected evaluation indicators by which we can compare objectively the biodiversity of protected areas corresponding to forest ecosystem, and applied them to Mt. Jiri and Mt. Bukhan National Parks. We reviewed literatures to select evaluation criteria. Frequently mentioned criteria and the structure of the forest which plays an importantrole of forest biodiversity were selected as the evaluation criteria. As the result, the selected evaluation indicators were 7-species diversity, species richness, evenness, rarity, disturbance species, indigenous species, and forest structure. In Mt. Jiri and Mt. Bukhan National Parks, species diversity were 3.492 and 2.943, species richness were 8.998 and 9.793, evenness were 0.849 and 0.680,rarity were 11.976 and 10.783, and disturbance species index were 0.214 and 0.357 respectively. Both national parks had abundant indigenous species and showed various forest physiognomies and stable 4-layer structure. It was found that crown density was higher in Mt. Jiri. Most indicators were implied high biodiversity in Mt. Jiri and Mt. Bukhan national parks.

• Journal of the Korean Geographical Society
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• v.28 no.4
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• pp.312-320
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• 1993

Along with the fade out of the Cold War the world is undergoing a fundamental restructuring. The process is generally refered to regionalization and globalization. In this context, the Paper presents a geopolitical perspective on the future of Northeast Asia. To meet the global trend, it is expected that the countries in the area organize an economically cooperative unity, the concept of which the author calls the northeast Asian Rim (NEAR). With its huge potentials to become the largest economic area in the world and with its rather complicated historical and social background, the Rim is tentatively supposed to have a loose and soft organization, to be flexible in dealing with the intra-and interregional relations. The idea underlying the view is that the former area of confrontation between the land power and the sea power is, under the new world environment, going to recover its proper locational attributes and develop into a merging area, a new core. As a physical framework of the Rim a spatial structurc is assumed to consist of two-subrims and two development axes with four development centers.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 1996.11a
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• pp.230-235
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• 1996

Eigenstructure (eigenvalues/eigenvectors) assignment has been shown to be a useful tool for flight control system design. In the sense of the eigenstructure assignment, the effectiveness and disturbance suppressibility of a controller depend mainly on the left eigenstructure (eigenvalues/left eigenvectors) of a system. On the other hand, the disturbance decouplability is governed by the right eigenstructure (eigenvalues/right eigenvectors) of the system. In this paper, in order to obtain a disturbance decouplable as well as effective and disturbance suppressible controller, a concurrent assignment methodology of the left and right eigenstructures is proposed. The biorthogonality condition between the left and right modal matrices of a system as well as the relations between the achievable right modal matrix and state selection matrices are used to develop the methodology. The proposed concurrent eigenstructure assignment methodology guarantees that the desired eigenvalues are achieved exactly and the desired left and right eigenvectors are assigned to the best possible(achievable) sets of eigenvectors in the least square sense, respectively. The proposed design methodology is applied to designing a lateral flight control system for an L-1011 aircraft with disturbances.

• Journal of Institute of Control, Robotics and Systems
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• v.1 no.1
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• pp.4-12
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• 1995

In the sense of eigenstructure (eigenvalues/eignenvectors) assignment, the effectiveness and disturbance suppressibility of a controller depend mainly on the left eigenstructure (eignevalues/left eigenvectors) of a system. On the other hand, the disturbance decouplability is governed by the right eigenstructure (eignevalues/right eigenvectors) of the system. In this paper, in order to obtain a disturbance decouplable as well as effetive and disturbance suppressible controller, a concurrent assignment methodology of the left and right eigenstructure is proposed. The biorthogonality condition between the left and right modal matrix and state selection matrices are used to develop the methodology. The proposed concurrent eigenstructure assignment methodology guarantees that the desired eigenvalues are achieved exactly and the desired left and right eigenvectors are assigned to the best possible (achievable) sets of eigenvectors in the least square sense, respectively. A numerical example is presented to illustrate the validity and usefulness of the proposed methodology.

• Proceedings of the Korea Information Processing Society Conference
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• 2013.05a
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• pp.867-868
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• 2013

본 논문은 물류창고와 같은 실내 공간에서 RFID와 초음파 센서등을 이용하여 이동로봇이 자율적으로 자신의 위치를 파악하고 관리자가 지정한 목표 물체를 인식하여 간단한 업무를 보조할 수 있는 기법을 제안한다. 실내공간엔 RFID를 지면과 목표물체에 설치하고 로봇은 RFID의 리더기와 물체 접근시 활용이 가능한 추가적 센서를 갖춤으로써 이동시 자기 위치를 실시간으로 파악하고 물체로부터도 고유정보를 얻는다. 초음파 센서 신호의 귀환시간을 활용하여 근접한 물체와의 상대 거리를 추출하고 바닥의 RFID로부터 이미 획득한 자기 위치를 조합하여 목표 물체의 절대 위치를 구한다. 이는 이동 로봇을 중심으로 한 경로지도를 실시간으로 작성하며 동시에 실내의 이동 가능 구조 및 목표 물체의 파악이 가능하여 이동로봇의 자율적 탐색을 위한 최적 경로 계획 수립에 활용 가능하다.

• Proceedings of the Korea Information Processing Society Conference
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• 2008.05a
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• pp.913-916
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• 2008

TPS(Triple Play Service)를 통한 IP-TV,인터넷, 전화 등이 통합되는 추세에서, IPv6 상용네트워크가 수 년 안에 구축될 필연성을 공감하고 있다. 그러나 [1] 현재 IP-TV 서비스에서 Delay, Jitter,전송장애등 QoS에 대한 사용자 불만이 계속 발생하고 있다. 또한 현재 서비스중지 (DoS : Denial of Service)를 유발하는 [2] 인터넷 침해 사고가 월 평균 2157건 이상 발생하는 등, Security Issue의 증가 문제가 지속 되고 있다. IPv4/IPv6 듀얼 스택 멀티 캐스트 네트워크를 구현하여, 라우팅, 멀티캐스트(PIM-SM), QoS, Security 이슈에 대한, 최적의 방안을 도출하여, 라우팅 구현시 IPv6 라우팅 프로토클 간에 재분배(Redistribution) 장애 해결책, IPv6 특성에 따른 멀티캐스트 그룹주소 지정시의 장애대책을 제시하였고, QoS 에서는 기존의 QoS 정책의 문제점과 IPv6의 고유한 패킷 구조의 장점을 활용한 Adaptive QoS 방법을 제시하고, IPv6 멀티캐스트 서비스 중지 공격 유형을 정의하여, 최적화된 IPv6 멀티캐스트 구성 모델을 제시 하였다. 결론적으로 구현된 시스템에서 IPv6 패킷 분석을 통해서 최적화된 경로 통신 및 차별화된 IPv6 패킷의 QoS 방안을 제시하였으며, 서비스 중지공격을 대응하는 Security 보장성을 갖고 있음을 검증하여, 향후 상용화된 IPv4/IPv6 네트워크 구현을 위한 최적화 방안을 제시 하였다.

• Korean Journal of Ichthyology
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• v.10 no.1
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• pp.67-76
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• 1998

The ichthyofauna and the structure of fish community were surveyed from April to November 1997 at eighteen stations in the Yonggang river which is a first tributary located at the middle reach of the Nakdong river system. During the surveyed period, 32 species belonging to ten families were collected. Of them cyprinid fish occupied 53.1% (17 species) and cobitid fish 15.6% (5 species). Thirteen species (40.6%) were known as Korean endemic species. Dominant species were Zacco temmincki (32.78%) and Moroco oxycephalus (15.10%). Zacco platypus, Pungtungia herzi. Niwaella multifasciata, and Odontobutis platycephala were common species. Rare species which occupied less than 0.1% of total individuals were Lampetra reissneri, Pseudorasbora parva, Squalidus chankaensis tsuchigae, Microphysogobio koreensis, Gobiobitia naktongensis, Cobitis rotundicaudata, Nemacheilus toni, Silurus asotus, Silurus microdorsalis, Siniperca scherzeri, and Oreochromis niloticus. A tendancy were shown in regional distribution that Moroco oxycephalus dominated in upper stream, Zacco temmincki and Moroco oxycephalus in mid - upper stream, Zacco temmincki and Niwaella multifasciata in mid - lower stream, and Zacco platypus and microphysogobioid fishes in lower stream. St. 11 which located in mid- reach of Yongam stream and St. 15 and 18 which located in main stream had the most stable and diverse community structure, but St. 1, 5, and 7 were unstable and the simplest community structure.

• Journal of Preventive Medicine and Public Health
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• v.29 no.2 s.53
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• pp.255-264
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• 1996

To study reliability and validity of PWI, this newly developed self-administered questionnaire which measures stress, was given to medical students. All respondent(133) were followed 4 weeks later and 92 were retested. Cronbach's $\alpha$ coefficient of data was 0.93. Test-retest reliability measured by Pearson's correlation coefficient was 0.72(P<0.01). Exploratory factor analysis(EFA) performed by principal axis factor method without iteration and by varimax rotation explored 13 principal components(eigenvalues > 1). After exploring 4 factor structure according to previous study results, factor 1 showed good agreement but other factors did not. Confirmatory factor analysis(CFA) showed poor fit of 4 factor model to data. In the further study, it may be considered to model that has unidimensional factor structure.

• Korean Journal of Ecology and Environment
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• v.42 no.3
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• pp.394-403
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• 2009

The fish fauna and community structures were investigated at 15 stations in the midupper region of the Seomjin River watershed from August in 2008 to April in 2009. During the studying period, 42 species belonging to 11 families were collected. Dominant family in the all sites was Cyprinidae (28 species, relative abundance: 66.7%) during the study. Total of 42 species (primary freshwater: 40 species, peripheral freshwater: 2 species) were found with the primary freshwater fishes being the highest. Dominant species was Zacco platypus (22.3%), and subdominant species was Coreoferea herzi (10.8%). Also, Pseudogobio esocinus (9.0%) and Carassius auratus (5.8%) were numerous. There were 17 Korean endemic species (40.5%), including Rhodeus ocellatus, Acheilgnathus koreensis, A. somjinensis, Coreoleuciscus splendidus and Sarcocheillichthys variegatus wakiyae. Among them, Acheilgnathus somjinensis was identified for designation required to protect under a wildlife category. In conclusion, we could define that the Seomjin River watershed has a very good water conditions as habitat of fish.