• 한국건설관리학회논문집
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• 제22권6호
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• pp.15-23
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• 2021

건설산업 혁신방안의 일환으로 건설생산체계가 개편됨에 따라 직접시공이 확대되고 있는 추세이다. 본 연구는 이러한 추세에 따라 직접시공 확대의 영향 및 문제점을 건축관련 업계의 입장과 외국 사례 조사를 통하여 분석하고 직접시공 확대 조치에 따른 영향을 다양한 측면에서 진단하여 직접시공의무제도를 바람직하게 적용하기 위한 대응방안을 제언하였다. 또한, 각 대안에 대하여 정책/행정 및 건축 분야 전문가 인터뷰를 통하여 효과 및 문제점을 평가하였다. 본 연구에서 도출된 직접시공의무제도 확대 및 효율화를 위한 대응방안은 발주자의 재량권 부여, 공사규모에 따른 차별화, 건설보증시스템 활용, 탄력적 작업반장제 도입의 4가지로, 전문가 인터뷰 결과 모두 직접시공 확대에 직간접적으로 긍정적 영향을 줄 것으로 평가되었다. 본 연구는 직접시공 현황을 조사하여 직접시공의무제도 적용에 있어 기초자료를 제공하며 또한 적절한 직접시공의무제도 적용을 위한 대응방안 도출과 이에 대한 전문가 평가를 통하여 직접시공 확대를 위한 방향을 제시함으로써 결과적으로 합리적 직접시공의무제도 운영을 통한 건설기업과 현장의 생산성 향상 및 효율화에 기여할 것으로 기대된다.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2005년도 ICCAS
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• pp.990-993
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• 2005

This paper presents new results on designing a robust adaptive direct controller for a class of non-linear first order systems. The designing method based on the use of dead zone in the parameters' update law. It is shown that the size of the dead zone does not depend on the upper bounds of the disturbances. That means that even if the bounds are large, the tracking error will always converge to a set of the dead zone size. However, in the ideal case, when the exogenous signal functions and the function represents un-modeled dynamics of the systems equal to zero, the proposed controller does nt mean the convergence to zero of the tracking error. Computer simulation results show the effectiveness of the controller in dealing with the stated problems.

• 산업경영시스템학회지
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• 제26권1호
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• pp.30-39
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• 2003

This paper presents the business model and system functionalities of a B2B e-marketplace solution that not only can overcome some problems of the public e-marketplace, but also can be applicable to both public and private types of e-marketplaces. This solution is different from the most of the public e-marketplace solutions that their main sources of revenue are transaction commissions or transaction fees through the third-party intermediation. Instead, this solution provides an ASP (Application Service Provider) functionality for direct, disintermediated purchasing and sales-related transactions between suppliers and buyers. With this functionality, suppliers and buyers electronically commerce with each other without the disclosure of their transactions as well as transaction commissions.

• Journal of Mechanical Science and Technology
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• 제15권11호
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• pp.1580-1587
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• 2001

In Part I, we extended the capability of the Goore Scheme for application to multi-dimensional problems and improved convergence performance. In this paper, we apply the improved Goore Scheme to th e control of turbulence for drag reduction. Direct numerical simulations combined with the control scheme are carried out to simulate a controlled turbulent channel flow at low Reynolds number. The wall blowing and suction is applied through the Goore algorithm using the total drag as feedback. An optimum distribution of the wall blowing and suction in terms of the wall-shear stresses in the spanwise and streamwise directions is sought. The best case reduces drag by more than 20 %.

• Journal of Mechanical Science and Technology
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• 제15권11호
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• pp.1572-1579
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• 2001

We investigate the possibility of application of the Goore Scheme to turbulence control for drag reduction. In Part I, we examine the performance of the original Goore Scheme by applying it to a si mple one-dimensional problem. For the application of the scheme to turbulence control, we extend the scheme's capability so that it can treat multi-dimensional problems and examine its validity theoretically. The convergence of the extended scheme with a dynamic memory is faster by an order of magnitude than the original scheme. In Part II, we apply the proposed scheme to reduce drag for turbulent channel flows through direct numerical simulation.

• 한국작물학회지
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• 제42권6호
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• pp.752-758
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• 1997

본 실험은 건답직파재배에서 전체 시비량의 50％를 차지하는 기비의 양을 줄이므로 인해 나타나는 토양내 질소의 농도변화를 알아보기 위하여 기비의 시용량을 이앙재배의 일반적인 시비량인 70kg-N/10a에 대해 75％, 50％, 25％, 무시용구로 하여 각각의 토양 내의 암모니아태 질소, 질산태 질소의 처리 후 농도변화를 조사하였고 그 결과는 다음과 같았다. 1. 암모니아태 질소의 농도는 전체 시비량 140kg-N/ha의 50％를 기비로 시용한 처리구에 대해 75％, 50％, 25％, 0％의 수준으로 절비처리한 토양에서 기비의 시용량이 적을수록, 토심이 깊어질수록 낮아졌으며, 기비처리 후 27일이 경과한 후로는 모든 처리구에서 처리 전과 비슷한 양의 농도를 보였다. 2. 질산태 질소의 농도 또한 기비시용량이 적을수록, 토심이 깊어질수록 낮았다. 기비처리 후 27일 후에는 기비를 70kg-N/ha의 수준으로 시비한 토양에서는 기비를 주지 않은 토양보다 5배 정도 많은 양이 잔존하고 있었으며, 나머지 처리구는 처리 전의 농도보다는 다소 높았지만 처리 후 초기보다는 많은 양이 감소하였다. 3. Pot 실험을 통해 담수상태에서의 질산태 질소의 용탈량을 조사한 결과 시비 14일 후에는 질소시비량에 관계없이 거의 모든 양이 용탈되었다. (감수심≒20mm /일) 4. 40∼50cm 깊이의 토양에 존재하는 암모니아의 농도와 질산의 농도를 누적시킨 결과를 통해 시비처리한 비료의 대부분은 중력수와 함께 계속해서 하향이동하는 것으로 보여지며 이들은 대부분 그대로 용탈된 것으로 보여진다.

• 현장농수산연구지
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• 제7권1호
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• pp.35-46
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• 2005

규산질비료이용 복토직파재배 개선을 위한 폿트시험 연구에서 얻어진 결과를 요약하면 다음과 같다. 본 연구에서 복토재료에 따른 초기 입모율차이는 무복토 55.0%에 비하여 복토처리로 90~100%의 높은 입모율을 보였다. 특히 파종직후 강우조건에서는 무복토 0%의 출아를 보인반면 복토처리에서는 65~100%의 입모율을 보였으며 강우 시에는 무복토 조건에서도 85%의 비교적 높은 입모율을 보였다. 특히 토양을 이용한 복토처리구에서는 강우로 인하여 20%의 매우 낮은 입모율을 보였는데 이는 수분에 의한 토양층 형성으로 산소공급 및 유모출아 조건이 불량하여 입모율이 극히 저조한 것으로 나타났다. 출수기 벼 생육은 무복토(비강우)처리구를 제외한 모든 처리구에서 비교적 양호한 벼 생육을 보였다. 벼 수량은 초기 입모 및 중간생육이 불량한 무복토(비강우) 및 토양 복토구(강우)에서 낮은 수량성을 각각 보였다.

• The Journal of Asian Finance, Economics and Business
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• 제10권2호
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• pp.83-90
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• 2023

This study aims to determine the direct effect of positive online reviews, negative online reviews, the usefulness of online reviews, reviewers' expertise, timeliness of online reviews, the volume of online reviews, and comprehensiveness of online reviews on accommodation booking intentions and also the indirect effect of positive online reviews on the intention of booking accommodations through trust as mediation. Research respondents are users of the accommodation booking application in Yogyakarta. Hypothesis testing was carried out using SEM (Partial Least Square). Data was collected by distributing questionnaires to 135 respondents. The results of this study indicate that the Usefulness of Online Reviews, Volume of Online Reviews, and Comprehensiveness of Online Reviews have a direct positive and significant influence on the accommodation booking Intention of booking application users in Yogyakarta. The variables of Negative Online Reviews and Timeliness of Online Reviews have negative and significant influences on the accommodation booking Intention of booking application users in Yogyakarta. Positive Online Reviews and Reviewer Expertise variables are not significant in this study. At the same time, the Trust variable has a full mediation relationship in an indirect relationship between the Positive Online Reviews variables and the accommodation booking Intention of booking application users in Yogyakarta.

• 한국가정과교육학회지
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• 제14권1호
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• pp.87-95
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• 2002

The purposel of this study was to examine the effects which the direct and the indirect instructions at a Home Economics class have on improving the learning achievements and attitudes. To accomplish these goals. 90 students. the number of two classes of the first tirade at p high school at Anyang city of Kyonggi province were selected. They are composed of the experimental group and the comparative group. Each group contained 40 students. The former was implemented by indirect instructions and the latter direct instructions. The 'Family and Domestic Life' unit of the first tirade was selected as the study subject to take effects and 30 periods of class were enforced. For the experimental measure of this study. the researcher used a pre-learning test. a learning attitude test. and a learning achievement test as means of measure. The two groups were confirmed as the group having the same quality, So after the experimental measure, the results of the post tests(included a learning achievement test and a learning attitude test) were verified by T-test in order to research the problematic subject. and SPSS/win statistics package was used for the processing of the statistics. The results are following: 1. The direct and the indirect instructions represented the meaningful differences in the learning achievements (p <.05). They represented the meaningful differences in improving the learning achievements of knowledge and understanding(p <.05). It was verified that the (order is more effective than the latter in improving the learning achievements of knowledge and understanding, and They represented the meaningful differences in the improving learning achievements of application (p <.05) 2. They represented the meaningful differences in the learning attitudes at a domestic class(p <.05) The latter is more effective than the former in changing into the positive learning attitudes. In the light of these result7. the direct instructions are effective in improving the learning achievements of knowledge and understanding. and the indirect instructions are effective in improving the learning achievements of application. Also the indirect instructions are more effective than the direct instructions in changing into the positive learning attitude.

• 대한통합의학회지
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• 제11권1호
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• pp.53-62
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• 2023

Purpose : This study evaluated the effects of transcranial direct current stimulation and a virtual reality program on the depression, hand functions, cognitive function, and activities of daily living of patients with mild cognitive impairment by dividing 20 patients with mild cognitive impairment and depression. The 20 patients were divided into a treatment group (transcranial direct current stimulation + a virtual reality program) and a control group (placebo transcranial direct current stimulation + a placebo virtual reality program). Methods : This study allocated ten subjects to the treatment group and ten subjects to the control group. The treatment was given five times per week for six weeks (30 sessions), and each session was 30 minutes. This study screened depression by using SGDS-K, a short geriatric depression scale, to examine depression before and after treatment intervention. This study also used the box and block test, NCSE, and FIM to evaluate hand functions, cognitive function, and activities of daily living, respectively. Results : The results showed that depression significantly decreased, hand functions significantly increased, cognitive function significantly improved, and activities of daily living significantly increased after intervention in the treatment and control groups. The magnitude of changes in depression, hand functions, cognitive function, and activities of daily living was significantly different between the two groups after intervention (p>.05). Conclusion : The results showed that the application of transcranial direct current stimulation and a virtual reality program could improve cognitive function, hand functions, and activities of daily living by decreasing depression. Therefore, it can be concluded that the simultaneous application of transcranial direct current stimulation and a virtual reality program is an intervention method, which can be applied for decreasing depression, enhancing hand functions, improving cognitive function, and increasing activities of daily living in patients with mild cognitive impairment.