• Journal of Astronomy and Space Sciences
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• v.36 no.3
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• pp.187-197
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• 2019

The Optical Wide-field patroL-Network (OWL-Net) is a Korean optical space surveillance system used to track and monitor objects in space. In this study, the characteristics of four Initial Orbit Determination (IOD) methods were analyzed using artificial observational data from Low Earth Orbit satellites, and an appropriate IOD method was selected for use as the initial value of Precise Orbit Determination using OWL-Net data. Various simulations were performed according to the properties of observational data, such as noise level and observational time interval, to confirm the characteristics of the IOD methods. The IOD results produced via the OWL-Net observational data were then compared with Two Line Elements data to verify the accuracy of each IOD method. This paper, thus, suggests the best method for IOD, according to the properties of angles-only data, for use even when the ephemeris of a satellite is unknown.

• Journal of Digital Contents Society
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• v.7 no.2
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• pp.125-131
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• 2006

In the recent year, the need for effective searching for e-learning contents has emerged as a revitalization of e-learning. Therefore, there are many studies for the contents searching method that make use of semantic web technology. Also, there are many studies to apply the ontology as the core technology of sematic web to e-learning. In this study, we bind the KEM(Korea Education Metadata) that enacted as the first technical standard of e-learning, KS X7001, in Dec. 2004 with OWL to use the metadata for a effective searching with ontology through the solving of the problem of metadata. And, we discuss some problems that occur in progress of binding and the solutions.

• The Bulletin of The Korean Astronomical Society
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• v.37 no.2
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• pp.214.1-214.1
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• 2012

한국천문연구원은 우주물체 전자광학 감시체계 기술개발 사업을 통해 자국위성의 추적감시를 위해 0.5m 광시야 감시관측소 국제 네트워크(OWL : Optical Wide-Field patroL)를 구축할 예정이다. OWL 시스템의 설계 검증을 위해 시험모델을 개발하였고, 연구소 내에 테스트베드에 설치하여 종합적인 테스트를 수행하고 있다. OWL 시험모델은 해외 설치모델과 동일하게 제작하였으며 돔을 제외한 모든 서브시스템을 국산화하였다. 유효구경 0.5m의 Richey-Cretian 형식의 광학계로 1.75도의 광시야를 구현하였고 영상보정을 위해 5개의 보정 렌즈를 사용하였다. 인공위성 추적을 위해 초당 10도 이상 기동이 가능한 alt-az 방식의 마운트를 개발하였다. 단일 노출에서 다수의 인공위성 궤적을 얻기 위해 chopper 제어 시스템을 도입하였고, chopper, 필터휠, de-rotator, CCD 카메라 등 4개의 부분품을 하나로 묶어 간결한 back-end를 구성하였다. 시스템의 안정성 향상과 유지보수의 용이성을 위해 망원경 및 관측소 제어 전용보드를 개발하였고, 전자동 무인관측을 위한 스케줄러 및 운영소프트웨어를 개발하였다. 시험모델을 이용하여 수 개월간 테스트을 수행하고, 관측결과 분석을 통하여 문제점을 수정보완한 후 OWL 시스템의 최종 설계안을 확정할 예정이다.

• Proceedings of the Korean Information Science Society Conference
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• 2010.06c
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• pp.90-93
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• 2010

시맨틱 웹은 웹 환경에서 데이터의 의미를 표준화된 방법으로 표현함으로써 데이터의 상호 운용성을 보장하고 기계가 활용 가능한 데이터의 웹을 가능하게 해준다. 온톨로지에서 데이터는 식별자(URI)를 사용해서 의미가 명확화되고, 표준 기술 방법(RDF)를 통해서 어플리케이션 간 데이터의 통합 및 재사용을 가능하게 해준다. 최근 미국과 유럽을 중심으로 링크드 데이터 프로젝트를 통해서 시맨틱 데이터들의 상호연계가 활발하게 추진하고 있다. 그러나 다양한 출처들의 데이터를 연계하는 과정에서, 동일한 객체에 서로 다른 식별자가 할당된 경우 식별자를 통한 시맨틱 정보 연계에 문제가 발생할 수 있다. OWL에서는 동일 객체에 대한 2개 이상의 식별자가 부여된 경우 owl:sameAs를 이용해서 식별자들이 동일 객체를 가리키고 있음을 명시한다. 본 연구에서는 서로 다른 식별자를 가진 객체들이 owl:sameAs를 사용해서 동일 객체로 표현되었을 경우, 동일 객체에 부여된 식별자 정보를 효과적으로 관리하고, 이를 서비스에 활용하기 위한 관리 서버를 설계하였다. 관리 서버를 통해 동일 객체에 대한 식별자들의 체계적인 관리는 물론, 동일 객체를 찾기 위한 질의 횟수를 감소시켜서 서비스 소요시간을 줄일 수 있다.

• Korean Journal of Veterinary Service
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• v.40 no.2
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• pp.95-99
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• 2017

Wild owls are widespread in Korea, even being common in urban areas due to the presence of hills or small mountains in and around the cities. This results in high levels of contact between owls and domestic animals. This study investigated the prevalence of avian hematozoan parasite infection in 2 common owl species in Chungbuk province of Republic of Korea for 3-year period: the Eurasian eagle owl (Bubo bubo) and the Brown hawk owl (Ninox scutulata). Peripheral blood smears taken from 56 wild owls were examined by microscopic examination and confirmed by molecular technique. Twenty (36%) of these samples tested positive for the Haemoproteus infection. The infection rate was higher in Brown hawk owls (50%) than in Eurasian eagle owls (33%). These results indicate that the wild owls may act as a reservoir for Haemoproteus infection in susceptible domestic birds.

• The KIPS Transactions:PartD
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• v.14D no.2
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• pp.265-272
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• 2007

In this paper, we implement an automated composition system of web services using hybrid techniques that merge the benefit of BPEL techniques, with the advantage of OWL-S, BPEL techniques have practical capabilities that fulfil the needs of the business environment such as fault handling and transaction management. However, the main shortcoming of these techniques is the static composition approach, where the service selection and flow management are done a priori and manually. In contrast, OWL-S techniques use ontologies to provide a mechanism to describe the web services functionality in machine-understandable form, making it possible to discover, and integrate web services automatically. This allows for the dynamic integration of compatible web services, possibly discovered at run time, into the composition schema. However, the development of these approaches is still in its infancy and has been largely detached from the BPEL composition effort. In this work, we describe the design of the SemanticBPEL architecture that is a hybrid system of BPEL4WS and OWL-S, and propose algorithms for web service search and integration. In particular, the SemanticBPEL has been implemented based on the open source tools. The proposed system is compared with existing BPEL systems by functional analysis. These comparisions show that our system outperforms existing systems.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.9 no.2
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• pp.415-421
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• 2008

The increasing interest in ontologies is driven by the large volumes of information now available as well as by the increasing complexity and diversity of this information. These trends have also increased interest in automating many activities that were traditionally performed manually. We are currently engaged in this paper that have realized benefits in productivity and clarity by utilizing UML class diagrams to develop and to display complex OWL ontologies. UML has many features, such as profiles, global modularity and extension mechanisms that are not generally available in most ontology languages. However, ontology languages have some features that UML does not support. Our paper identifies the similarities and differences between UML and the ontology languages RDF and OWL. To reconcile these differences, we propose a modification to the UML metamodel to address some of the most problematic differences.

• Korean Journal of Veterinary Service
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• v.32 no.4
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• pp.391-397
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• 2009

Eurasian eagle owl (Bubo bubo kiautschensis) is a natural monument (No. 324) and is also classified as an endangered wildlife grade II the Ministry of Environment of Korea. Eurasian eagle owl is threatened by the human being. But the efficient rescue and treatment for Eurasian eagle owl are still problematic, due to lack of basic data. In this study, to obtain basic resources for establishing more efficient rescue system, we held a physical examination and measured size physical part. In addition, we analyzed blood sample and feces samples and autopsy. We conduct the physical examination with measuring tapes and scales for 16 live features and 11 dead features. After inhalation anesthesia take the blood samples from wing vein. Blood samples are analyzed in hematologic and chemistric methods. We collected the feces through individual floor of cages from 12 live features and conducted the feces analysis. Autopsy was conducted for 11 dead samples. In physical examination, the mean body weight and total length of live features was 2.26${\pm}$0.35kg, 61${\pm}$2.38cm, the mean body weight and total length of dead features was 1.57${\pm}$0.51kg, 59.31${\pm}$3.51cm. Mean PCV was 46.57${\pm}$4.97%, while mean TPP was 3.49${\pm}$0.57g/dL. In feces sample analysis, 9 of 12 owls(75%) were infested by gastrointestinal helminths. The infection rates were: Trematoda (41.7%), Capilaria sp.(66.7%), acanthocephalans (25%). In autopsy, we confirmed 11 features were infested by duplicated infection of more than 2 helminths. Result of this study will be used for establishing reference range for physical features, blood analysis in Eurasian eagle owl. Therefore, to obtain basic resources for establishing more efficient rescue system, we have to make long-term conservation plans for Eurasian eagle owl.

• The Bulletin of The Korean Astronomical Society
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• v.37 no.2
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• pp.223.1-223.1
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• 2012

우주물체 전자광학 감시체계(OWL: Optical Wide-field Patrol)는 지구상에서 빠르게 이동하는 우주물체를 신속하고 정확하게 관측할 수 있는 광학 감시체계이다. 이 체계의 임무를 완수하기 위한 광학계는 약 2도 이상의 광시야, 충분한 광량 확보를 위해 직경 500 mm 이상의 주반사경(primary mirror), 광학적 능률향상을 위한 25% 이상의 투과율, 운반 및 진동에 의한 영상성능 저하를 보정하기 위한 부반사경 구동기능, 빠른 경통 회전속도에 의한 광학 및 광기구 구조물의 안전성 확보를 위한 작은 F-수 확보 등 주요 요구조건을 만족해야 한다. 본 논문에서는 OWL 광학계의 요구조건을 만족하는 광학계의 광학 및 광기구 설계 등 개발현황을 소개하고자 한다.

• Animal Systematics, Evolution and Diversity
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• v.29 no.2
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• pp.136-143
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• 2013

The collared scops owl that occurs in Korea is a protected species but its exact specific status has been questioned. To resolve the species status, a molecular phylogenetic analysis was conducted using two fragments of mitochondrial DNA, cytochrome b (cyt b, 891 bp) and NADH dehydrogenase subunit 2 (ND2, 627 bp) genes. Phylogenetic trees of cyt b revealed that all Korean specimens formed a monophyletic group with Japanese scops owl Otus semitorques with very low sequence divergence (d=0.008). We obtained a similar ND2 tree as well (d=0.003); however, the genetic distance between Korean individuals and O. lempiji from GenBank (AJ004026-7, EU348987, and EU601036) was very high and sufficient enough to separate them as species (cyt b, d=0.118; ND2, d=0.113). We also found that Korean species showed high differentiation from O. bakkamoena (AJ004018-20 and EU601034; cyt b, d=0.106; ND2, d=0.113) and O. lettia (EU601109 and EU601033, cyt b, d=0.110; ND2, d=0.117) as well. Therefore, we suggest that the Korean collared scops owl should be designated as Otus semitorques.