• Genomics & Informatics
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• 제14권4호
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• pp.230-233
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• 2016

Linkage disequilibrium (LD) is the non-random association between the loci and it could give us a preliminary insight into the genetic history of the population. In the present study LD patterns and effective population size (Ne) of three Korean cattle breeds along with Chinese, Japanese and Mongolian cattle were compared using the bovine Illumina SNP50 panel. The effective population size (Ne) is the number of breeding individuals in a population and is particularly important as it determines the rate at which genetic variation is lost. The genotype data in our study comprised a total of 129 samples, varying from 4 to 39 samples. After quality control there were ~29,000 single nucleotide polymorphisms (SNPs) for which $r^2$ value was calculated. Average distance between SNP pairs was 1.14 Mb across all breeds. Average $r^2$ between adjacent SNP pairs ranged between was 0.1 for Yanbian to 0.3 for Qinchuan. Effective population size of the breeds based on $r^2$ varied from 16 in Hainan to 226 in Yanbian. Amongst the Korean native breeds effective population size of Brindle Hanwoo was the least with Ne = 59 and Brown Hanwoo was the highest with Ne = 83. The effective population size of the Korean cattle breeds has been decreasing alarmingly over the past generations. We suggest appropriate measures to be taken to prevent these local breeds in their native tracts.

• 한국정밀공학회지
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• 제29권1호
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• pp.87-95
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• 2012

In recent years, laser-arc hybrid welding has begun to be adopted for assembly welding of automotive bodies and parts, because the hybrid welding process can weld lapped steel sheets having a larger gap than is possible with laser welding. In this paper, to predict the twist deformation by the hybrid welding when brackets are welded in B pillar of a passenger car, the residual stress using CAE is analyzed and the deformation result of CAE is compared with the measured deformation. First of all, after modeling heat source as intended to be expressed with laser-arc hybrid welding method, heat source fitting is done with welding conditions and a section of welding part obtained through specimen test. In case of heat source functions, laser used conical source and arc used double ellipsoid source. Through the local model analysis, elements which are located in the center of the model are selected. The elements are called WME(Welding Macro Element). This WME is extruded in the welding lines and welding phenomenon of complex parts is accomplished. The deformation amount after hybrid welding is got through a simulation, the validity of simulation is verified by measuring the panel and comparing with the simulation result.

• 한국의상디자인학회지
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• 제9권2호
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• pp.59-68
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• 2007

"Aloha" is the Hawaiian word that extends the warmth friendliness, and pride of the Hawaiian people to their island's visitors. The aloha shirt truly symbolizes aloha sprit to islanders and visitors alike. The earliest foreign settlers in the Hawaiian Islands were the Chinese and Japanese. They brought with them their myriad talents and trades, among them the art of tailoring. In July of 1936, a shirtmaker named Ellery J.Chun coined the term "Aloha Shirt" an apt characterization for such an eloquent garment. He was the first to make the shirt on a commercial basis. The shirt sold for as little as a dollar in Chun's own King-Smith store. The genuine aloha shirt is now regaled as a work of art and avidly sought out by collectors. When tourism came to Hawaii in the late 1930s, these unusal shirts were among the first thing that visitors had to have. Local designers and tailors worked quickly to meet the demand and began to expand the range of decoration to include palm trees and romantic beaches, tropical jungles and volcanoes, exotic flowers and scenes from polynesian legend. Therefore the aloha shirt had been born. The functional use of creative colors and amazing artistic renderings in these shirts certainly capture the simplicity and sprit of Hawaii. Aloha shirt is dress that display mystery and charm of Hawaii and cultural symbol of condensed Hawaiian mind. Furthermore, the innocence with which Hawaiians formerly translated their life and heritage onto fabric ranks these shirts with the finest of American folk art. Aloha shirt is made from cotton, silk, rayon in present and past. Most important design element of Aloha shirt is print pattern. Main print pattern of Aloha shirt are all over pattern, horizontal pattern, border pattern, Japanese pattern, picture pattern and back panel pattern. In this study I investigate the design characteristics and development process of aloha shirt.

• 한국농촌건축학회논문집
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• 제20권1호
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• pp.11-18
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• 2018

The study aims to address the energy crisis and realize self-sufficiency of building as part of local energy independence, breaking away from a single concentrated energy supply system. It is intended to develop modules of the outside insulation composite panels that conform to passive certification criteria and for site-assembly systematization. The method of study first identifies trends and passive house in literature and advanced research. Second, the target performance for development is set, and the structural material is selected and designed to simulate performance. Third, a test specimen of the passive outside insulation curtain wall module designed is manufactured and constructed to test its heat transmission coefficient, condensation performance and airtightness. Finally, analyze performance test results, and explore and propose ways to improve the estimation and improvement of incomplete causes to achieve the goal. The final test results achieved the target performance of condensation and airtightness, and the heat transmission coefficient was $0.16W/(m^2{\cdot}K)$, which is $0.01W/(m^2{\cdot})K$ below the performance target. As for the lack of performance, we saw a need for a complementary design to account for simulation errors. It also provided an opportunity to recognize that insulated walls with performance can impact performance at small break. Thus, to be commercialized into a product with the need for improvement in the design of the joint parts, a management system is needed to increase the precision in the fabrication process.

• 정보처리학회논문지D
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• 제8D권4호
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• pp.427-438
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• 2001

현재 국내에 보급되어 있는 시설 원예를 위한 온실 환경 제어 시스템은 노동 집약적 시설에 타이머를 이용하여 각 장치를 제어하는 on/off 식 제어반으로 구성되어 있다. 이러한 시스템은 하드웨어적인 결함, 야간이나 원격지에 있을 경우에는 오류 발생 등에 대한 온실의 상태 파악이 어렵다. 따라서, 본 논문에서는 기존의 on/off식 제어 방식을 현장에서는 액정 패널로 제어하도록 하였고, 온실의 각 장치를 제어하는 클라이언트 컴퓨터를 통하여 인터넷상에서 원격지의 데이터 획득과 온실의 상황을 모니터링할 수 있는 시스템을 개발하였다. 또한 각 지역별 온실과도 통신이 가능하며 오류 발생시에도 실시간으로 대처하는 경보 메시지 전송, 그리고 효율적인 온실 환경 제어 및 작물 재배 정보들을 관리할 수 있는 Web 서버를 구축하였다.

• 한국콘텐츠학회논문지
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• 제17권4호
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• pp.413-423
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• 2017

본 연구는 부모의 방임 및 학대와 청소년의 학교생활적응 사이의 관계에서 자아탄력성의 매개효과를 확인하기 위하여 시행되었다. 이를 위해 "한국아동청소년패널조사"의 초 4패널 4차년도 중학교 1학년 2,092명의 데이터를 사용하였다. 자료 분석을 위해 기술적 통계, Pearson 상관계수 및 위계적 회귀분석을 실시하였고, 매개효과의 유의성 검증을 위해 Sobel test를 실시하였다. 연구 결과는 다음과 같다. 첫째, 부모의 방임 및 학대는 청소년의 학교생활적응에 부정적인 영향을 미치는 것으로 나타나 부모의 방임과 학대를 경험한 청소년은 학교생활적응이 낮음을 알 수 있었다. 둘째, 부모의 방임과 학교생활적응 간의 관계에서 자아탄력성은 부분매개 효과를 갖는 것으로 나타났다. 셋째, 학대와 학교생활적응 간의 관계에서 자아탄력성은 부분 매개효과를 갖는 것으로 나타났다. 이러한 연구결과는 부모의 방임과 학대를 경험하고 있는 청소년들의 학교생활적응을 위해서는 부모의 방임과 학대를 감소시키고, 청소년들의 자아탄력성을 증진시키기 위한 노력이 가정, 학교 및 지역사회에서 필요함을 시사한다.

• Ocean and Polar Research
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• 제39권4호
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• pp.301-318
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• 2017

The production of Korean offshore fisheries has been gradually decreasing due to the severe depletion of offshore fisheries resources caused by excessive fishing efforts. The production of the offshore fisheries in 2016 was the lowest since 1975. So the federal and local governments in Korea adopted and implemented various fisheries management plans and policies in order to restore fisheries resources. However, these plans and polices have not been successful in re-establishing fisheries resources. Thus, in order to accurately diagnose the situation with regard to offshore fisheries, this study sought to estimate not only the return to scale by fishing gear of offshore fisheries, but marginal productivity of individual fishing gear based on production factors derived from offshore fisheries production functions. The study was organized in the following manner. First of all, this study estimates production functions of offshore fisheries. The Cobb-Douglas and the translog production functions are adopted as offshore fisheries production functions. Specifically, the functions are estimated by crew, vessels, and offshore resource as production factors. The offshore resource is estimated by the Clarke Yoshimoto Pooley model based on the surplus production model. Secondly, the fisheries production functions are extended to the fixed-effect model and the random-effect model with panel data. Thirdly, this study analyzes the return to scale of offshore fisheries and the marginal productivity of the production factors from the estimated offshore fisheries production function. In conclusion, this study suggests plans and countermeasures for productivity improvement by group (labor intensive or technology intensive) based on the characteristics of individual offshore fishing gear.

• 대한조선학회논문집
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• 제36권3호
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• pp.83-92
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• 1999

본 논문에서는 거대 부유체의 유체-구조 상호작용에 대한 보다 엄밀한 해석법을 전개하여 사파중에 놓은 구조물의 유탄성 거동에서 전단변형의 영향을 고찰하였다. 구조 해석 방법으로는 Mindlin 판 이론에 바탕을 둔 유한요소법을 사용하였으며, 유체장은 일정패널법을 이용한 그린함수법을 적용하였다. 유탄성 해석의 검증을 위해 선수파의 경우에 Yago & Endo가 수행한 Mega Float 모델의 실험결과와 비교하였는데, 전반적인 거동은 비교적 잘 일치하나 양단에서의 변위는 약간의 차이를 보였다. 유체-구조간의 상호작용에 기인하는 방사압력이 파 강제압력보다 국부적으로 큼을 보였으며, 계류계에 의하여 응답이 크게 줄어들 수 있음을 확인하였다. 또한 상기한 메가 프로트의 경우 사파중에서 전체 변형중 전단변형이 차지하는 비중은 대략 4% 정도임을 밝혔다.

• 디지털융복합연구
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• 제18권11호
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• pp.1-11
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• 2020

경제적인 요인은 장애인들의 삶의 만족도에 있어 중요하다. 또한 직무만족도가 삶의 만족도에 미치는 영향은 기존연구들에 의해 검증된 바 있다. 그러나 Herzberg는 동기-위생이론을 통해 임금과 같은 경제적 소득이 위생요인으로서 직무의 불만족을 낮출 뿐 직무의 만족도에는 영향을 주지 못한다고 하였다. 본 연구는 Herzberg의 동기-위생이론에 의문을 제기하고 실증적인 분석을 통해 이를 확인하고자 한다. 이에 국내 2017년 장애인 고용패널조사 데이터를 기반으로 위생요인이 장애인들의 직무만족도에 영향을 주고 있는지 분석하였으며, 나아가 우리나라 주요 지자체를 지역변수로 투입하여 이를 지역적 연구로 확장하였다. 구조방정식 모형을 분석한 결과 근무환경, 대인관계, 개인생활과 같은 위생요인은 장애인 근로자들의 직무만족도에 직접적인 영향을 주는 것으로 나타났다. 또한 위계적 선형모형을 통해 지역적 요인을 분석한 결과 장애인 근로자들의 직무만족도를 높이기 위해서는 지자체의 교육지원이 무엇보다도 필요하다는 것이 확인되었다.

• Nuclear Engineering and Technology
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• 제44권1호
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• pp.53-60
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• 2012

The aim of this study was to explore the spatial and energy resolutions of a PET scanner that we have recently developed. The scanner, which consists of six detector modules with 1-layer LGSO crystals, has a hexagonal configuration with a faceto- face distance of 86.4 mm between two opposite PET modules; such properties facilitate the imaging of small animals. A $^{22}Na$ point source was employed to estimate horizontal and vertical spatial resolutions. To assess the energy resolution, a uniform $^{18}F$ cylindrical phantom was scanned. A software-based spectrum analysis of list-mode data was used to assign a local energy window centered on the photopeak position for every single crystal. For the image reconstruction, an ML-EM algorithm was used. The spatial resolutions at the center of the scanner were 0.99 mm in the horizontal direction and 1.13 mm in the vertical direction. The energy resolution averaged over each PMT ranged from 13.3%-14.3%, which gave an average value of 13.8%. These results show that this simple system is promising for small animal imaging with excellent spatial and energy resolutions.