• The Korean Journal of Ecology
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• 제22권1호
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• pp.1-6
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• 1999

공단지역과 비공단지역의 삼림에서 토양미소절지동물의 개체군 밀도, 수직 및 계절적 분포 그리고 토양산도와의 관계를 비교 조사하였다. 조사지역 토양에서 관찰·분리된 토양미소절지동물은 총 3950개체 이었으며, 그 중 제일 많은 개체수는 거미강으로 총 1,918개체로 전체 의 약 48.5%를 차지하였다. 체장이 가장 길은 곳은 칠갑산의 낙엽수림이며(113.6 mm), 가장 짧은 곳은 대산지역의 낙엽활엽수림지역이었다(46.8 mm). 토양소동물의 개체수는 봄에서 여름에 걸쳐 증가하였고, 가을과 겨울로 갈수록 감소하는 추세를 보였다. 계절에 따른 수직분포상황은 전체적으로 봄에는 중층부에서 많이 나타났고 여름과 가을은 상층부에서 그리고 겨울은 하층부에 많이 분포하는 것으로 나타났다. 종다양도지수는 비공단지역(1.02)이 공단지역(0.73)보다 높았고 가장 높은 곳은 계룡산 침엽수림의 중층(5∼10 cm)에서 1.60이었고, 가장 낮은 곳은 대산 낙엽수림의 심층(10∼15 cm)에서 0.24로 나타났다.

• 한국통계학회:학술대회논문집
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• 한국통계학회 2004년도 학술발표논문집
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• pp.295-300
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• 2004

We consider a G/M/1 queue with two-stage service policy. The server starts to serve with rate of ${\mu}1$ customers per unit time until the number of customers in the system reaches A. At this moment, the service rate is changed to that of ${\mu}2$ customers per unit time and this rate continues until the system is empty. We obtain the stationary distribution of the number of customers in the system.

• 대한기계학회논문집
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• 제10권1호
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• pp.50-55
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• 1986

본 연구에서는 경계면에 맞춘 좌표계를 이용한 mapping을 통하여 37개봉으로 구성된 유로에서의 전달현상을 분석하였다.

• 한국정밀공학회지
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• 제13권6호
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• pp.90-101
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• 1996

Determination of assembly sequence of components is a key issue in assembly operation. Although a number of articles dealing with assembly sequence determination have appeared, an efficient and general methodology for complex products has yet to appear. The objective of this paper is to present the problems and models used to generate assembly sequence from design data. An essential idea of this research is to acquire a finite number of voxels from any complex geometric entity, such as 3D planar polygons, hollow spheres, cylinders. cones, tori, etc. In order to find a feasible assembly sequence, the following four steps are needed: (1) The components composing of an assembly product are identified and then the geometric entities of each component are extracted. (2) The geometric entities extracted in the first step are translated into a number of voxels. (3) All the mating or coupling relations between components are found by considering relations between voxels. (4) The components to be disassembled are determined using CCGs (Component Coupling Graph).

• 한국어류학회지
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• 제22권1호
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• pp.56-60
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• 2010

기름종개와 왕종개로부터 기원한 단성생식집단인 Cobitis hankugensis-Iksookimia longicorpa complex는 대부분 암컷으로만 구성되어 있으며 최근에 1종류의 2배체와 2종류의 3배체집단이 확인되었다. 이들의 난막구조를 조사한 결과 3가지 종류로 구분될 수 있었다. 융모형은 이들의 부모종인 왕종개에서 확인되었으며, 과립형은 기름종개와 3배체집단, 그리고 과립을 가진 융모형은 2배체집단에서 나타났다. 특히 과립형을 가지는 3집단에서는 그들의 길이와 밀도에서 서로 차이를 보였다. 이러한 구조들은 cobitid complex에서 처음 보고될 뿐 아니라 2배체, 3배체 complex집단을 분류하는 데 이용될 수 있다.

• 한국수산과학회지
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• 제47권6호
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• pp.1037-1054
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• 2014

In this study, the status of coastal fisheries was examined based on the catch and number of fishing vessels of coastal fisheries in Korea. Comparing the status on coastal fisheries of the East Sea, Yellow Sea and South Sea in Korea, scientific evidence was made for fisheries management on coastal fisheries based on characteristics of each sea area. From 1990 to 2011, the catch of coastal fisheries in Korean waters ranged from 150,000 mt to 230,000 mt, with an average of 190,000 mt, and it accounted for 15% in average of total catch fished in adjacent waters of Korea. In order of catch by coastal fisheries, gillnet (36.7%) was the primary fishery, followed by coastal complex (24.7%), stow net (18.3%), trap (12.9%), lift net (3.9%), purse seine (3.0%) and beam trawl (0.4%) fisheries. In order of catch by species, anchovy (15.0%) had the largest proportion of total catch, followed by common squid (10.3%), akiami paste shrimp (5.2%), blue crab (3.9%) and octopus (3.7%). Of the average catch by sea area from 1990 to 2011, Yellow Sea, South Sea and East Sea were 37.4%, 34.6% and 28.0%, respectively. Since 2000s, however, the average catch of South Sea has accounted for the largest proportion. The number of permitted fishing vessels involved in 8 coastal fisheries was 55,336 vessels in average from 1997 to 2011. The number of vessels was about 47,000 vessels in 1997, and increased to 61,300 vessels until 2000, then has decreased to 44,000 vessels operating in 2011. In order of the number of permitted fishing vessels by fisheries, complex (52.4%) took the first place, followed by gillnet (31.5%), trap (13.4%), stow net (0.8%), beam trawl (0.8%), purse seine (0.6%), lift net (0.4%) and seine net (0.0%). In order of the number of permitted fishing vessels by sea area, South Sea (29,994 vessels) took the first place, followed by Yellow Sea (18,185 vessels) and East Sea (7,158 vessels). In order of the catch per unit effort (CPUE, mt/vessels) which was analyzed using catch and number of vessels in average by fishery, stow net is the highest followed by lift net, trap, purse seine, gill net, beam trawl and complex fisheries. In particular, the CPUE of complex and gill net fisheries, which accounted for the largest number of vessels were 4.0 mt/vessels and 1.6 mt/vessels, respectively. Since those are too low relative to other fisheries, it was judged to need systematical management on both fisheries.

• 전기전자학회논문지
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• 제27권1호
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• pp.116-121
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• 2023

본 논문에서는 딥러닝 예측 결과 정보를 적용하는 복합 미생물 배양기를 위한 딥러닝 구조를 개발한다. 제안하는 복합 미생물 배양기는 수집한 복합 미생물 데이터에 대해 복합 미생물 데이터 전처리, 복합 미생물 데이터 구조 변환, 딥러닝 네트워크 설계, 설계한 딥러닝 네트워크 학습, 시제품에 적용되는 GUI 개발 등으로 구성된다. 복합 미생물 데이터 전처리에서는 미생물 배양에 필요한 당밀, 영양제, 식물엑기스, 소금 등의 양에 대해 원-핫 인코딩을 실시하며, 배양된 결과로 측정된 pH 농도와 미생물의 셀 수에 대해 최대-최소 정규화 방법을 사용하여 데이터를 전처리한다. 복합 미생물 데이터 구조 변환에서는 전처리된 데이터를 물 온도와 미생물의 셀 수를 연결하여 그래프 구조로 변환 후, 인접 행렬과 속성 정보로 나타내어 딥러닝 네트워크의 입력 데이터로 사용한다. 딥러닝 네트워크 설계에서는 그래프 구조에 특화된 그래프 합성곱 네트워크를 설계하여 복합 미생물 데이터를 학습시킨다. 설계한 딥러닝 네트워크는 Cosine 손실함수를 사용하여 학습 시에 발생하는 오차를 최소화하는 방향으로 학습을 진행한다. 시제품에 적용되는 GUI 개발은 사용자가 선택하는 물 온도에 따라 목표하는 pH 농도(3.8 이하) 복합 미생물의 셀 수(10⁸ 이상)를 배양시키기 적합한 순으로 나타낸다. 제안된 미생물 배양기의 성능을 평가하기 위하여 공인시험기관에서 실험한 결과는, pH 농도의 경우 평균 3.7로, 복합 미생물의 셀 수는 1.7 × 10⁸으로 측정되었다. 따라서, 본 논문에서 제안한 딥러닝 예측 결과 정보를 적용하는 복합 미생물 배양기를 위한 딥러닝 구조의 효용성이 입증되었다.

• 농촌계획
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• 제22권2호
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• pp.153-164
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• 2016

Developed countries in agriculture like Netherlands, Belgium and England, have managed Green Care policy and project during the last decades. The needs in Green Care is also increasing as new growth power in rural area of Korea. This study investigated sites which are already operating as complex with Green Care theme. This study surveyed the operating conditions like type, scale, location pattern, purpose, customer and finance for cases of the complex. The period of the survey is from 2015. 8. 11 to 2015. 09. 10 for the 24 activated cases in aspect of operation and management. Among the 24 cases, 16 cases were classified as Green Care Complex which facilities are aggregated a place, and the other 8 cases as Green Care Cluster which are distributed at several places. The analysis result showed that there were apparent distinction among cases in total budget, costs of construction, capacity for guest, and the total number of annual visitors. Despite of the type and scale the accommodation cost, the number of workers, and amount of sales have small deviation in distribution of values, although the cases have various type of contents and scale of space. The result of this study can be used as data of bench marking to develop the Green Care Complex or Cluster in rural area.

• 대한금속재료학회지
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• 제46권4호
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• pp.199-208
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• 2008

This study is concerned with effects of complex oxides on Charpy impact toughness of heat affected zone (HAZ) of API X80 linepipe steels. Three kinds of steels were fabricated by varying alloying elements such as Ti, Al, and Mg and hot-rolling conditions to form complex oxides, and their microstructures and Charpy impact properties were investigated. The number of complex oxides present in the steel containing excess Ti, Al, and Mg was twice larger than that in the conventional steels, while their size ranged from 1 to $3{\mu}m$ in the three steels. After the HAZ simulation test, the steel containing a number of oxides contained about 20 vol.% of acicular ferrite in the simulated HAZ, together with bainitic ferrite and martensite, whereas the HAZ microstructure of the conventional steels consisted of bainitic ferrite and martensite with a small amount of acicular ferrite. This formation of acicular ferrite in the oxide-containing steel was associated with the nucleation of acicular ferrite at complex oxides, thereby leading to the great (five times or more) improvement of Charpy impact toughness over the conventional steels.

• 한국응용과학기술학회지
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• 제6권2호
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• pp.39-44
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• 1989

(N-docosyl pyridinium)-TCNQ(1:1) complex was synthesized by reacting N-docosyl pyridinium bromide and LiTCNQ. This complex was investigated and confirmed by elemental analysis. U.V, I.R spectra. A stability to the dispersion solvent, which is acetonitrile, dichloromethane, benzene, chloroform and acetonitrile-benzene (1:1, V/V) of (N-docosyl pyridinium)-TCNQ(1:1) complex was investigated by U. V spectrophotometer and was confirmed stabilized on acetonitrile, benzene and acetonitrile-benzene(1:1'V/V) for 7 hours. Using ultra pure water as subphase for L-B film deposition, the Y-type L-B film of (N-docosyl pyridinium)-TCNQ(1:1) complex was farbricated. The electrical conductivities on a perpendicular direction of the L-B film were measured to be $5{\times}10^{-5}{\sim}5{\times}10^{-14}$S/cm according to the number of layer.