• 전기의세계
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• v.32 no.2
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• pp.86-92
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• 1983

우리 전기공업계의 숙원사업이던 초고압 및 대전력 연구설비가 1982.10.29일 준공식을 마치므로서 전기공업계의 활성화를 도모하게 되었다. 이중 고전압 시험설비에 대하여 기술하고자 한다. 고전압 시험연구동 건물과 부대설비는 1979.10.15 착공하여 1981.4.17 준공을 시키고 동년 9.25일 연구시험설비 설치공사를 완료 11.27일부터 12.22일까지 A.C내전압 시험설비에 대한 성능시험을 마치고, 연구업무를 개시하기 시작하였다.

• Journal of radiological science and technology
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• v.40 no.1
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• pp.127-134
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• 2017

The purpose of this study was to assess the impact by comparing the concentration of indoor radon and look for ways to lower the concentration of indoor radon gas measurements of three variables, the year of completion, volume of the building and ventilation. Measurement target is six classrooms on the sixth floor of building that was constructed in 1973 and was extended in 2011. Selected classroom's volume is different. Four classrooms were selected to compare the radon concentration in accordance with the year of completion, Classrooms that is same year of completion were selected to compare the radon concentration in accordance with the volume, six classroom was performed closure and ventilation to compare radon concentration according to ventilation. Radon concentrations in accordance with the year of building completion showed a high concentration of radon in a building recently built. Also, Radon concentration in volume is high the smaller the volume. Radon concentration change according to ventilation showed a reduction of about 80% when the ventilation than during closing. Especially, The radon concentrations were high detected while the recently year of building completion and the smaller volume. Ventilation of the three variables is considered that can be expected to exposure reduction effect by radon affecting the greatest radon concentration reduction.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.38 no.6
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• pp.681-688
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• 2020

The Under Space Integrated Map has been constructed consistently from '15 construction projects until the present time in an effort to implement the "ground sinking prevention method" for the purpose of strengthening underground safety management. The constructed Under Space Integrated Map is utilized to provide information to the person in charge at local government through application of the system of underground information based on the administrative network and to deliver this to specialized underground-safety-effects -evaluation organizations through map extraction based on a floor plan. It suffers from a limitation in its practical use, however, since information is only provided, without promoting a separate renewal project. Although in Section 1 of Article 42 in the Special Law Concerning Underground Safety Management the content pertaining to submission obligations of completion drawings related to underground information including change and renewal are stated explicitly in order to solve this problem, submission is not sufficient since a submission window based only on the administrative network is operated. Accordingly, the Ministry of Land, Infrastructure, and Transport constructed an online system for submitting completion drawings, in an attempt to change the method by which entities involved in underground development directly submitted completion drawings. In this study, a DB standard relating to submitting completion drawings was designed and applied in order to construct an auto-renewal system based on submitted completion drawings, which will be extended to cover the range to underground structures hereafter.

• Journal of Digital Convergence
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• v.13 no.8
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• pp.83-89
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• 2015

In the process of complex shopping mall development, all the steps (business planning step, pre-sale & completion step, management & operations step) head towards a consistent ultimate goal in an overall business perspective. In this study, we analyze using a structural equation model if an appropriate relations between each of the steps are formed to achieve the ultimate goal. In this study, we find a positive relationship between business planning step and pre-sale & completion step, and also find that for success pre-sale & completion, a faithful business plan is necessary. But we find no statistically significant relationship under significant level 0.05 among business planning step and management & operations step and the level of success, pre-sale & completion step and management & operations step and the level of success, management & operations step and the level of success. This suggests that each of the steps does not form a close relationship to achieve the consistent goal in the complex shopping mall development and each one is doing a short-sighted work for its own profit.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.31 no.1D
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• pp.33-42
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• 2011

The types of the accidents caused by intra-city buses and the changing tendencies of driving attitudes are analyzed before-and-after semi-public management system of intra-city bus system is implemented. On the basis of analysis, the measures on the decrease of traffic accidents are considered and the results are as follows. First, it showed that the traffic accidents decreased generally as a result of definition of the progresses of traffic accidents of intra-city buses before-and-after the system is implemented and with the passing of time after the system was operated. Second, the factors which influence the decrease of traffic offenses before-and-after semi-public management system of intra-city bus are the decease of violation, safe driving duty and the job security. Also the cause which mostly influence to the decrease of traffic accidents is defined. Finally, the measures of decrease of traffic accidents are arranged and proposed as a result of PROXSCAL method.

• Journal of Digital Convergence
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• v.18 no.2
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• pp.1-12
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• 2020

This study aimed to select and evaluate policy priorities for the expansion of public and semi-public systems for coastwise passenger transport services. For research methodology, the Consistent Fuzzy Preference Relations (CFPR) method was used to effectively extract expert knowledge. First, the result of the analysis on policy tasks for expanding the semi-public system for coastwise passenger transport services showed that "the establishment of public transportation fare system" was the most important task at 0.160. Second, "conversion of the subsidiary routes to a public system by the central government" was ranked next at the importance of 0.136. The factor named "support through proper allocation of budgets between national and local governments" are ranked third (0.119). The results of this study have practical implications in that it proposed the policy priorities for the expansion of the public semi-public systems for coastwise passenger transport services.

• Journal of Korean Society for Geospatial Information Science
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• v.17 no.3
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• pp.13-21
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• 2009

Digital map should have the up-to-dateness as well as the accuracy to perform a role as the national spatial data. As digital mapping process require aerial photograph, surveying, and field working, it consumes a lot of time and cost. So there is a limit to maintain the up-to-dateness. If we updates the digital map frequently by using the as-built drawings, we can prevent the waste of national budget by reuse of existing drawings and make accuracy updates from existing survey results. In spite of this advantages, due to insufficiency of CAD drawing standard, inconsistency of file types of as-built drawings and digital maps, and topology relations between input features and original features, so the frequent updates using the as-built drawings is on the difficult situation to perform. In this research, first, CAD features extracted from as-built drawings land the new/update whether original features exist or not and generate topology from spatial relation of features. Second, suggest the efficient partial-update-plan performing integrity test. As a result, guarantee the accuracy and the up-to-dateness of digital map.

• Proceedings of the Korean Society of Surveying, Geodesy, Photogrammetry, and Cartography Conference
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• 2009.04a
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• pp.19-21
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• 2009

Updating in Digital Map 2.0 using as-built drawings required for correcting spatial conflicts due to data acquired at different time. In this paper, we defined the type of spatial conflicts and logical expression between river and contours.

• The Optical Journal
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• s.131
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• pp.32-33
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• 2011

(주)포로옵틱스(대표 정진호, www.prooptics.co.kr)가 지난 1월 19일 산학연 인사들을 초청하여 신사옥 준공식 행사를 가졌다. 2005년 12월 지금의 이천시 부발읍에 사옥 준공식을 가진 후 5년 만에 사세 확장과 함께 신사옥을 완공한 이 회사는 오는 3월 창립 10주년을 앞두고 10주년 기념식도 겸하여 더욱 뜻 깊은 자리가 되었다. 280여 평 규모로 지어진 신사옥에서는 3D 광학계를 비롯하여 초정밀 대구경 비구면 렌즈 가공을 통해 초고미세 노광광학계, 천체 망원경 및 인공위성 광학계를 생산할 수 있는 기반을 구축하게 됐다.

• Proceedings of the KIPE Conference
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• 2005.07a
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• pp.137-139
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• 2005

본 논문에서는 30W급 스위칭형 직류전원장치 (Switching Mode Power Supply : SMPS)에 준공진형 프라이 백 스위칭 레귤레이터(quasi-resonant flyback switching regulator)를 적용하여 방사노이즈(radiation-noise)를 억제한 사례에 대하여 설명하고 있다. 기존의 PI사(社)의 TOP IC 시리즈$^{[1]}$와 같이 보편적으로 사용되고 있는 일명, 하드 스위칭(hard-switching)형 레귤레이터를 사용할 경우, 고속 스위칭시에 스위칭 손실(switching loss)과 스위칭 노이즈(switching noise)가 발생한다. 이로 인하여 SMPS의 발열에 따른 효율저화와 방사 노이즈에 의한 전파방해 등이 문제점이 된다. 본 논문에서는 일본의 Sanken사(社)에서 개발/시판중인 준공진형 스위칭 레귤레이터인 STR-F6000 IC 시리즈$^{[2]}$를 이용하여 프라이백 SMPS를 구성하여 방사노이즈를 저감하였다.