• 농업과학연구
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• 제33권2호
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• pp.179-193
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• 2006

Technical efficiency of semiforcing watermelon growers is 0.8248 on average, and distributed between 0.6744 and 0.9268. The result showed that semiforcing watermelon growers had by 18% of technical inefficiency and could be assumed that increasing technical efficiency could induce watermelon production more increase. Consequently, if growers' technical efficiency were improved while other environments were constant, watermelon production could be increased. Following the results from the inefficiency effect model, all assumption coefficient such as growers age etc, are significant at 10% level. Estimate of dispersion parameter ${\gamma}$ is 0.89, which confirms those differences between practical output and frontier output were derived from the technical efficiencies among growers. Differences of production system between high and low level growers in production efficiency were showed at side altitude, ventilation and heat-retaining in section of facilities and automation, soil test and calcium application in section of environment management, transplant preparation and duration of pollination in section of crop management and shipment place, sorting degree and management record analysis in section of business management respectively. As a result of analyzing consulting data by using standard diagnosis table of watermelon cultivation under structure which cultivated on semi-forced watermelon growers, gap between high and low level growers was 7.0 points in facility automation section, 7.1 points in environment section, 8.8 points in crop management section and 13.6 points in business management section, respectively, which were the biggest one among them. In case of excluding information-related items from the evaluation index of business management section, changes of business achievement are to occur. Therefore, it is recommended for us to review the standard diagnostic table of watermelon cultivation under structure by dividing evaluation index of management section into management and information.

• 경영과학
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• 제17권3호
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• pp.119-129
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• 2000

Design of web site must include community considerations alongside technical design aspects. The main purposes of this study are to identify the community criteria for evaluating web site and to examine how business web sites include the community factors. To identify the evaluation criteria, the author reviewed recent literatures and made a table showing a summary result(see Table 1). appendix shows a sample form NASDAQ(n=82) and KOSDAQ(n=59) which were evaluated. Using the evaluation from with 189 items(Table 3), all sites were visited and review between August 28, 2000 and September 6, 2000. The auther’s evaluations were done from the perspective of community building in business sector. Table 4, summary data on the results of the study, shows that the level of application of the community concept is very low. Among the listed 18 items, only a few items are utilized at more than 50% level. Less than 10% items are Member Profile, Group Segmentation, Backstory, Forum, Chat, Fact-to-face Meeting, and Collaborative Design. the unbalanced utilization due to the lack of community concept in businesses are found. Korea firms are superior to NASDAQ firms in terms of Bulletin Board and FAQ; But Korean firms are inferior and remain at very low level in terms of Member Login, Education Materials, Backstory, Forum, and Integrating Off-line Activities which are core factors of community building.

• 한국유기농업학회지
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• 제26권1호
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• pp.1-17
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• 2018

This study analyzes the management performance of environmentally-friendly rice farms using GCM method based on the multifaceted approach. This approach compares the management performance of GCM farms before and after the introduction of GCM, as well as the performance of GCM farms with the performance of conventional farms. It also compares the technical and managerial competence level of surveyed GCM farms with that of conventional farms based on the standard diagnosis table developed by Rural Development Adminstration. Results showed that average income has increased after the introduction of the GCM method and the average income of GCM farms was higher than that of conventional farms, while the level of rice production in farms using GCM method was lower than that of conventional farms. In addition, the technical and managerial competence score of surveyed farms using GCM method was higher than that of conventional farms. These results implies that the higher management performance of GCM farms compared to the conventional farms is attributed to not only the GCM method but also the competence level of farms using GCM method.

• Earthquakes and Structures
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• 제10권4호
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• pp.811-828
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• 2016

This study aims to present nonlinear time history analysis results of double leaf cavity wall (DLCW) reinforced concrete structure exposed to shake table tests. Simulation of the model was done by a Finite Element (FE) program. Shake table experiment was performed at the National Civil Engineering Laboratory in Lisbon, Portugal. The results of the experiment were compared with numeric DLCW model and numeric model of reinforced concrete structure with unreinforced masonry wall (URM). Both DLCW and URM models have two bays and two stories. Dimensions of the tested structure and finite element models are 1:1.5 scaled according to Cauchy Froude similitude law. The URM model has no experimental results but the purpose is to compare their performance level with the DLCW model. Results of the analysis were compared with experimental response and were evaluated according to ASCE/SEI 41-06 code.

• Structural Engineering and Mechanics
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• 제55권5호
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• pp.1037-1053
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• 2015

This paper presents finite element (FE) based pushover analysis of a reinforced concrete structure with a two-leaf cavity wall (TLCW) to estimate the performance level of this structure. In addition to this, an unreinforced masonry (URM) model was selected for comparison. Simulations and analyses of these structures were performed using the DIANA FE program. The mentioned structures were selected as two storeys and two bays. The dimensions of the structures were scaled 1:1.5 according to the Cauchy Froude similitude law. A shake table experiment was implemented on the reinforced concrete structure with the two-leaf cavity wall (TLCW) at the National Civil Engineering Laboratory (LNEC) in Lisbon, Portugal. The model that simulates URM was not experimentally studied. This structure was modelled in the same manner as the TLCW. The purpose of this virtual model is to compare the respective performances. Two nonlinear analyses were performed and compared with the experimental test results. These analyses were carried out in two phases. The research addresses first the analysis of a structure with only reinforced concrete elements, and secondly the analysis of the same structure with reinforced concrete elements and infill walls. Both researches consider static loading and pushover analysis. The experimental pushover curve was plotted by the envelope of the experimental curve obtained on the basis of the shake table records. Crack patterns, failure modes and performance curves were plotted for both models. Finally, results were evaluated on the basis of the current regulation ASCE/SEI 41-06.

• 토지주택연구
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• 제3권1호
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• pp.79-82
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• 2012

While there exists a relatively large body of technical information for the engineered design of wood-frame buildings to resist seismic ground motions, the quantitative assessment of seismic resistance of conventional houses built by prescriptive requirements is less well understood. Forintek Canada Corp., in collaboration with other research and industry partners, has embarked on a research project to address this topic. This paper will report on the seismic shake table tests of a full-scale wood-frame building. The two-story specimen, $6m{\times}6m$ in plan, was built on the seismic shake table at Tongji University in Shanghai, China, according to Part 9 of the 1995 National Building Code of Canada and shaken uni-directionally in each of the two principal directions. Three different seismic table motions were applied at increasing peak ground motion amplitudes up to 0.40 and 0.50 g. The specimen was repaired after the above sets of seismic table motions, and successive runs were conducted for increased door openings. Measurements included specimen accelerations, displacements and anchorage forces. Static stiffness of the specimen was measured at low force levels, and natural frequencies were measured after each seismic loading stage by applying low-level random excitation. The results presented consist of the capacity spectra of the shake table tests, changes in specimen stiffness and natural frequencies with increasing seismic loading. These results and those from other recent shake table tests elsewhere will be compared with simplified engineering calculations based on codified values of strength, and on that basis preliminary conclusions will be drawn on the adequacy of the current code provisions and design guides in Canada and the USA for conventional wood-frame construction.

• 한국산림과학회지
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• 제102권3호
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• pp.390-397
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• 2013

본 연구는 비모수추정 방법인 자료포락 기법을 이용하여 청양, 공주, 부여 등 충남지역의 밤나무 재배임가를 대상으로 경영효율성을 평가하였다. 분석자료는 2012년 3월부터 10월까지 실시한 '|밤나무 경영에 관한 실태조사'결과 중에서 20개 임가의 투입요소(관리비, 수확비, 재료비, 간접비, 재배면적)와 산출요소(조수입액)를 대상으로 하였다. 그리고 DEA 기법중 CCR 모형과 BCC 모형을 이용하여 기술효율성, 순수기술효율성, 규모효율성을 분석하였고 비효율성 임가의 개선방안도 제시하였다. 추가적으로 DEA 분석결과의 검증을 위하여 기술효율성과 표준진단표 결과를 비교하였다. 연구결과, 기술효율성은 평균값이 0.667로 전체적으로 비효율적으로 분석되었고 그 원인은 순수기술효율성이 평균 0.944, 규모효율성이 평균 0.703으로 나타나 재배기술적인 측면에서는 순수기술효율성이 높았지만 규모의 효율성에서는 비효율성이 존재하였다. 효율성이 1인 임가는 기술효율성 6개, 순수기술효율성 13개, 규모효율성이 6개 임가로 나타났고, 3개 모두 1인 임가는 6개로 나타났다. 표준진단표 점수와 비교한 결과 80점이상 고득점을 기록한 임가는 5개로 나타났고 이 중 기술효율성이 1로 분석된 임가는 3개로 나타났다. 또한 기술효율성과 표준진단표의 최저점수와 최고점수를 기록한 임가도 동일하게 나타났다. 이것은 DEA를 이용한 경영 효율성 평가가 표준진단표와 함께 현장에 적용 가능하다는 것을 나타낸다.

• 펄프종이기술
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• 제31권2호
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• pp.64-69
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• 1999

Drainage phenomena on the conventional fourdrinier table can be divided into two distinct zones based on the drainage mechanisms involved. In the forming zone, natural drainage is the principal water removal mechanism, while in the vacuum zone vacuum dewatering displaces water in the wet sheet with air. In this study to investigate the influence of polyelectrolyte addition on natural and vacuum dewatering a vacuum drainage tester was developed and used. Addition of PAM decreased the dryness of the wet sheet after vacuum dewatering since substantial reduction in vacuum level occurred due to flocculation of fibers. Addition of PAM, however, increased the wet web dryness when the fines content of the stock is greater than 35% indicating the presence of fines reduced the air permeability of the wet web to increase its response to vacuum dewatering. On the other hand, PEI, which flocculates the fibers and fines via patch formation, showed little impact on the drainage characteristics of the stocks.

• 한국수산과학회지
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• 제7권4호
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• pp.209-214
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• 1974

Casein을 단백원으로 하고 조단백질과 지질의 함량을 조사한 사료로서 치무지개송어를 19일간 사육하여 다음과 같은 결과를 얻었다. 1) 무지개송어의 체중은 사료중의 단백질 함량이 많을수록 증가하며 단백질의 함량 $40\%$ 부근에서 최대치에 달하고 그 이상 단백질이 증가하여도 체중은 증가하지 않았다. 체단백질의 증가도 사료중의 단백질 함량이 $40\%$ 부근에서 최대치에 가까워지며 그 이상 단백질이 증가하여 도 변화는 적었다. 2) 단백질의 이용치는 사료중의 단백질 함양이 많을 수록 증가하였으나 체단백질의 축적률은 단백질의 함량 $40\%$ 부근에서 최대치에 달했다. 3) 이상의 결과에서 Casein을 단백원으로 하는 경우 치무지개송어의 단백질 요구량은 사료중 $40\%$라고 생각했다. 4) 사료의 단백효율(y)은 단백질의 함양(x)이 많을 수록 감소하고 그 관계는 y=4.91-0.034x의 방정식으로 표시 할 수 있었다. 5) 사료의 단백질 함량과 사료효율 및 사료계수와의 관계를 검토하였다. 끝으로 시종 실험을 지도하여 주신 동경수산대학에 야진길 교수에게 사의를 표한다.

• 한국산학기술학회논문지
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• 제22권3호
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• pp.671-678
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• 2021

2020 국방기술통제목록 연구는 기술보호 등급분류 설정 시 전문가 의견을 수렴하여 조사항목 설정, 등급분류 기준 설정 방법으로 정성적 기준에 의존했다. 이를 보완하여 기술보호 등급분류 설정의 정량적 기준을 제시하고자 본 연구를 수행했고, 본 논문에서는 통계기법을 적용한 기술보호 등급분류 설정 방법론을 제시하였다. 연구절차는 3단계로 진행하여 조사항목 설정, 기술보호 등급분류의 당위성을 입증하고자 하였다. 첫째, 판단지표를 선정하기 위해 2020 국방기술통제목록 작성 시 조사되었던 6개 조사항목, 즉 요소기술의 상대기술수준, 체계구현관점중요도, 국가안보관점중요도, 난이도, 기술이전기피, 파급효과에 대한 통계적 분석, 신뢰도 검증을 수행하여 조사항목을 설정하였다. 둘째, 선정된 조사항목을 AHP기법으로 계층화하여 전문가 설문조사를 수행하고 의견을 점수화했다. 도출된 조사항목의 가중치를 이용하여 요소기술의 점수를 산출했다. 마지막으로 정규분포 산포도와 사분위수 산출 방식, 카플란마이어 추정치 비율을 연계하여 3단계 등급설정을 하고, 723개 요소기술 점수의 카플란마이어 추정치값에 적용하여 기술보호등급을 3단계 기준점수를 제시하였다. 본 연구를 통해 설정된 등급설정표를 이용하여 일관성 있는 객관적인 기준을 제시할 수 있을 것이라 판단된다.