• Korean Journal of Ichthyology
• /
• v.17 no.4
• /
• pp.264-270
• /
• 2005

The ichthyofauna and fish community structure were investigated at three areas in Lake Chungju from April to October 2004. During the surveyed period,32 two species belonging to 12 families were collected. Dominant species in number was hemibarbus labeo (relative abundance : 23.2%) and subdominant was Erythroculter erythropterus (12.1%). Siniperca scherzeri (9.2%), and Pseudogobio esocinus (8.6%) were also numerous. There were nine Korean endemic species belonging to six families including Acheilognathus yamatsutae. The number of fish species collected was 28 in Danyang, 17 in Jecheon, and 15 in Chungju. Highest dominant index calculated was 0.670 in Chungju, and highest diversity index calculated was 2.442 in the Danyang area. We need closer observation of population fluctuation of some species, including H. labeo, the dominant species by biomass in Lake Chungju.

• Journal of Plant Biotechnology
• /
• v.48 no.4
• /
• pp.223-227
• /
• 2021

Several hypotheses for the origin of cultivated sweetpotato [Ipomoea batatas L. (Lam)] have been suggested but the exact progenitor is still unknown. Based on the results of RFLP patterns, microsatellite markers, SNP markers, FISH analyses, and genome analyses of haplotypes, wild species belonging to batatas group, I. trifida, I. leucantha, I. littoralis, I. tabascana, I. tenuissima, I. tiliacea, and I. triloba have been suggested as a progenitor. However, recently, advanced genomic technologies and characterization of the inserted T-DNA fragments of Agrobacterium in the genome of cultivated sweetpotato and wild species through horizontal gene transfer suggest that there may be an older progenitor than the wild species suggested so far.

• Korean Journal of Agricultural and Forest Meteorology
• /
• v.12 no.1
• /
• pp.23-35
• /
• 2010

For the sustainable conservation of forests within and around the somma of Nari basin in Ulleung Island, the stand structure and dynamics with the aspect, altitude and stand types were estimated by using analyses of importance value, plant species diversity, S$\o$rensen's similarity index and distributions of diameter classes. Results of the importance value analysis with vegetation stories on each stand showed that Fagus engleriana and Acer okamotoanum were dominant in most stands regardless of the aspect and altitude of the forest around the somma of Nari basin and the plant species composition among stands was not significantly different. The forest within Nari basin was composed of pine, beech, alder and deciduous-mixed stand. Moreover, the species composition was greatly different among the four stands. The diversity of plant species within stand was in general higher within Nari basin than around the somma, and among stands within Nari basin, the plant species diversity of pine and deciduous-mixed stand showed higher values than that of beech and alder stands. The similarity index among stands with aspect and altitude showed that the index among stands of eastern, western and northern slope in forest around the somma and forest within the basin ranged from 0.68 to 0.69, and the similarity among four stands with altitude was very high having index range from 0.85 to 0.95. The patterns of diameter class distribution of the major dominant species from four altitude classes followed an almost normal bell-shaped distribution. The results were interpreted as an indication that these forests will in general maintain a stable stand structure. Therefore, despite diverse topographic features around Nari basin, the stand structure and plant species composition among stands were not diversified as expected. For the conservation of diversity of forest plant species and of forest ecosystems, a promising and intensive program should be considered.

• Journal of Korean Society of Forest Science
• /
• v.104 no.3
• /
• pp.375-382
• /
• 2015

We classified the forest type and figured out the ecological characteristics for each of the types in order to provide the basic informations for being induced ecologically efficient forest practice plan by vegetation units in the natural forest of Songnisan. We established the 250 sample points and collected the vegetation data of vertical distribution for each sample. A variety of multivariate statistical methods were applied to classify the forest types. The species diversity index were analyzed to estimate the stability and maturity for forest vegetation in each the type. The types were divided from two to ten clusters by cluster analysis. The appropriate number of clusters was estimated five clusters by indicator species analysis. It was verified through the multiple discriminant analysis that the estimated number of clusters had been suitable. Based on the species composition for each the type, this study site was classified into five forest types: 1) Quercus serrata and 2) mixed mesophytic forest in the valley area, 3) Q. mongolica forest in the main ridge, 4) Pinus densiflora forest in the sub-ridge extending from the main, and 5) Q. variabilis-P. densiflora forest between the sub-ridge and valley. The species diversity index of the pine forest that had been a simple species composition was the lowest while that of the mixed mesophytic forest of which the composition had been diverse was the highest. As the forest vegetation was more varied, the index showed a tendency to increase.

• Proceedings of the Korea Water Resources Association Conference
• /
• 2018.05a
• /
• pp.236-236
• /
• 2018

한국농어촌공사 농어촌연구원에 구축되고 있는 대형 수리모형 실험시설은 수공구조물에 대한 수리모형실험 수행, 설계기준 제 개정, 호안 검인증제도 지원 등 국가의 정책지원과 개방 공유를 통한 국내 건설기업의 하천분야 신기술 개발 및 국가 경쟁력 확보, 하천 관련 원천기술 확보 등 다양한 목적을 가지고 진행되고 있는 대규모 분산공유형 실험시설에 해당한다. 본 사업의 일환으로 현재 구축 진행되고 있는 7종의 실험수로는 장기하상변동, 토석류, 실규모 호안블록, 감세공 수리특성, 신형어도개발 등 다양한 수리특성에 대한 계측 및 분석이 가능한 대형 실험시설에 해당한다. 7종의 실험수로는 PIV시스템의 연계 계측이 가능한 1) 고정식개수로, 2) PIV실험수로와 1/5의 역경사 재현이 가능한 3) 가변식경사수로, 호안블록 및 사석의 소류력 측정이 가능한 4) 고정식급경사수로, 토석류흐름 측정이 가능한 5) 가변식하도실험수로, 장기하상변동 분석을 위한 6) 대형유사순환수로, 부유사의 침 퇴적 양상 재현을 위한 7) 소형유사순환수로로 구성되어진다. 7종의 실험수로는 '18년 2월에 착공하여 현재 실시설계도서를 검토 중에 있으며, 18년 9월에 준공될 예정이다.

• Proceedings of the KAIS Fall Conference
• /
• 2009.12a
• /
• pp.283-286
• /
• 2009

최근 홈 네트워크를 지원하기 위한 다양한 연구가 진행 중이다. 이러한 홈 네트워크를 지원하기 위해서 가정 단위의 네트워크 형성, 해당 네트워크에서 사용자가 요구하는 환경 정보의 효율적인 수집, 그리고 수집된 정보를 통해 서로 다른 기계적 특성이 있는 전자기기 간에 통신할 수 있어야 한다. 본 연구에서는 센서 네트워크와 다양한 전자기기 간의 통신을 가능하게 하는 통신 미들웨어를 제안한다. 제안하는 미들웨어는 이기종의 센서 네트워크에서 다양한 데이터를 수집하고 수집된 정보를 사용자의 요구에 맞게 가공하여, 요구하는 전자기기와 통신을 통해 사용자에서 다양한 서비스를 제공할 수 있도록 한다.

• Proceedings of the Korean Information Science Society Conference
• /
• 2002.04b
• /
• pp.226-228
• /
• 2002

최근 진화 알고리즘을 이용하여 건축, 예술. 항공 기계 분야의 제품을 설계하려는 시도가 다양하게 이루어지고 있으며, Digenetics는 진화 체커 프로그램을 컴퓨터 전시회에서 공개하고 판매에 들어갔다 게임은 상업적으로도 가치가 높은 소프트웨어 산업분야의 중요한 영역이고, 인공지능 분야의 중요한 연구대상이다. 반면, 다양한 전문지식과 고속의 하드웨어만을 이용한 인공지능 구현의 한계로 인해 상업화되는데 어려움이 있었다. 진화 알고리즘은 개체의 우수성을 평가할 수 있는 방법만으로도 훌륭한 게임 플레이어를 생성해 낼 수 있어 많은 관심을 끌고 있다. 본 논문에서는 종분화의 일종인 크라우딩 알고리즘을 이용하여 다양한 체커 전략을 생성한 후 결합을 통해 일반 유전자 알고리즘을 이용한 전략에 비해 높은 성능을 냈다.

• Journal of the korean academy of Pediatric Dentistry
• /
• v.27 no.3
• /
• pp.394-399
• /
• 2000

Odontoma is defined as a benign odontogenic tumor containing enmel, dentin as well as cementum. It has come to mean a growth in which both the epithelial and the mesenchymal cells exhibit complete differentiation. Most authorities accept the view today that the odontoma represents a hamartomatous malformation rather than a true neoplasm. The etiology of odontomas is uncertain but hypothesized to involve local trauma, infection, inheritance or mutant gene. The odontomas often cause various disturbances in the eruption and position of the teeth. The steps in removal of an odontoma in close relation to an adjacent impacted normal tooth should comprise 1) removal of odontoma and 2) exposure of the impacted tooth. Orthodontic therapy may be applied. Before treatment, the necessary space for the impacted tooth should be evaluated. If there is lack of space in the dental arch, orthodontic treatment should be carried out before operation.

• Korean Journal of Environment and Ecology
• /
• v.28 no.6
• /
• pp.664-696
• /
• 2014

This study was carried out to investigate the insect diversity in the islands of Daecheong-do and Socheong-do, Incheon, Korea. The survey was conducted six times throughout the day and night from June to October 2011. As a result, a total of 336 species, belonging to 78 families of 9 orders of insects were collected: 286 species, of 75 families in 9 orders from Daecheong-do and 106 species, 42 families and 8 orders from Socheong-do. 744 species, belonging to 103 families of 10 orders were identified in total including previous reference. Lepidoptera was the most commonly identified order with 439 species of 29 families (59%), and the next most commonly identified order was Coleoptera with 124 species of 27 families (16%). Among them, Copris tripartitus and Fabriciana nerippe, endangered species of wildlife fauna in Korea, were found in this study. Also, 2 species (Coenonympha oedippus, Lycaena dispar) belonging to IUCN Red List, 25 species belonging to Management of Exportable species, 5 species belonging to Endemic species, 6 species belonging to Korean Red List, 77 species belonging to Designated species and 2 species belonging to Climate-sensitive Indicator species were recorded. In this study, 147 species of 58 families and 43 species of 24 families were newly added in Daecheong-do and Socheong-do, respectively.

• The Korean Journal of Malacology
• /
• v.16 no.1_2
• /
• pp.55-60
• /
• 2000

Molluscan drugs have been traditionally used as a folk medicine mainly in China, Hong Kong, Japan, Taiwan and Korea. Medicinal mollusks commonly used in the Far Eastern countries including Korea were investigated in this study, through a search of old and modern Chinese and Japanese literatures. A total of 63 medicinal species were listed: 5 species of two families in land snails, 2 species of one family in freshwater gastropods, 9 species of three families in freshwater bivalves, 23 species of five families in marine gastropods, and 24 species of five families in marine bivalves. Of 63 species searched, 22 species are occurring in Korea: 1 species of one family in freshwater gastropods, 4 species of three families in freshwater bivalves, 7 species of four families in marine gastropods, and 10 species of four families in marine bivalves. At least, medicinal mollusks occurring in Korea should be conserved preferentially to keep our natural resources and biodiversity.