• 한국실내디자인학회:학술대회논문집
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• 한국실내디자인학회 2007년도 춘계학술대회 논문집
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• pp.114-118
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• 2007

The space for production, such as studios and control rooms, is a space for TV program production, which is the main function of broadcast. A block planning for such space should be carefully designed, because it can significantly affect the efficiency of production, as well as future productivity and the development and expandability of production. From the results of comparative analysis of 7 local terrestrial broadcasters built since the late 1990s, this study will. propose an ideal block planning for the future construction of local terrestrial broadcasters. Also, the results can be used a basic data when constructing new buildings for local broadcasters.

• 로봇학회논문지
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• 제8권4호
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• pp.256-265
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• 2013

A local map-based exploration algorithm for mobile robots is presented. Segmented frontiers and their relative transformations constitute a tree structure. By the proposed efficient frontier segmentation and a local map management method, a robot can reduce the unknown area and update the local grid map which is assigned to each frontier node. Although this local map-based exploration method uses only local maps and their adjacent node information, mapping completion and efficiency can be greatly improved by merging and updating the frontier nodes. Also, we suggest appropriate graph search exploration methods for corridor and hall environments. The simulation demonstrates that the entire environment can be represented by well-distributed frontier nodes.

• 농촌지도와개발
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• 제16권1호
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• pp.21-49
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• 2009

There is a wide range of agreement for reorganization of administrative units. It is expected that regionalization of city governments and city-county consolidation would contribute to enhance efficiency of extension services and weaken citizen accessibility, responsiveness, and participation. Therefore, it is suggested that branch office of extension center should be provided to the isolated rural areas in order to maintain the appropriate level of services. Also, the relationship and linkage between the national/regional government and local extension centers should be reshaped by making current linkage system such as monthly Provincial Meeting and central-local association more effective. Establishment of agricultural database of each local region is needed to strengthen local extension center's role. Finally, extension service agency needs to consider to expand its function from the traditional extension services to a variety of 'rural issues.'

• 가정과삶의질연구
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• 제24권4호
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• pp.103-116
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• 2006

This study reviews trends of Japanese consumer policies, with particular attention to the situations of operating local consumer centers, in an effort to find ways to develop rapidly changing local consumer administration practices in Japan. Budget cut on consumer administration by the Japanese government has resulted in a reduction of consumer centers in Todohuken, while new consumer policy, which seeks greater consumer independence, has encouraged civil consumer groups' participation in consumer administration. In particular, entrustment of consumer centers to civil groups has increasingly stimulated more region-oriented local consumer policies and enhanced the efficiency of consumer administration. To activate local consumer administration, it seems necessary to provide assistance to entrusted civil groups, strengthen business regulations of Todohuken administration, and ensure more effective operation practices of civil consumer groups.

• 한국IT서비스학회지
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• 제12권2호
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• pp.103-118
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• 2013

Harmful contents on a mobile platform are becoming serious problems to young people due to the prevalence of smart phones with the fast development of mobile technology. Mobile applications and contents are so much optimized on the mobile environment that young men are exposed to many harmful contents. A system for blocking harmful contents is suggested in this study. The system includes a local proxy function, filtering module, and local database in order to increase the blocking efficiency. The local proxy function and the filtering module are implemented on an Android platform, and the local database are running on a PC-based server. The suggested system perfectly blocks harmful contents, and shows relatively high speed.

• Steel and Composite Structures
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• 제20권3호
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• pp.693-718
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• 2016

This paper presents a finite element procedure based on Bridging multi-scale method (BMM) in order to incorporate the effect of local/cross-sectional deformations (e.g., flange local buckling and web crippling) on the global behaviour of thin-walled members made of fibre-reinforced polymer composite laminates. This method allows the application of local shell elements in critical regions of an existing beam-type model. Therefore, it obviates the need for using computationally expensive shell elements in the whole domain of the structure, which is otherwise necessary to capture the effect of the localized behaviour. Consequently, highly accurate analysis results can be achieved with this method by using significantly smaller finite element model, compared to the existing methods. The proposed method can be used for composite polymer laminates with arbitrary fibre orientation directions in different layers of the material, and under various loading conditions. Comparison with full shell-type finite element analysis results are made in order to illustrate the efficiency and accuracy of the proposed technique.

• 한국산업보건학회지
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• 제29권2호
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• pp.208-216
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• 2019

Objective: The aim of this study is to control residual chemicals or by-products generated in chambers during preventive maintenance (PM) in the semiconductor manufacturing industry. We designed local exhaust ventilation using computational fluid dynamics (CFD). Methods: The air flow characteristics and capture efficiency between rectangular and slot hoods were compared numerically. The software Fluent 18.1 was used to estimate uniform velocity distribution and capture efficiency for contaminants. A metal from group 15 in the periodic table was released at the bottom of the chamber to simulate emissions. Results: The slot hood had a higher capture efficiency than a rectangular hood under the same conditions because the slot hood provided uniform air flow and higher face velocity. Also, there was no rotating swirl in the plenum for slot, that is why slot had better efficiency than rectangular even though they had similar face velocity. With less than 10 slots, the capture efficiencies for contaminants were nearly 95%. The optimum conditions for a hood to achieve high efficiency was 8 to 10 slots and a face velocity over 1 m/s. Conclusions: Well-designed ventilation systems must consider both efficiency and convenience. For this study, a slot hood that had high capture efficiency and no work disturbance was designed. This will contribute to protection of the worker's health in a PM area and other areas as well. Also, this study confirms the possibility of the application CFD in the semiconductor fabrication industry.

• 디지털융복합연구
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• 제19권12호
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• pp.21-28
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• 2021

본 연구의 목적은 2014년도 부산광역시로 이전한 한국주택금융공사의 사례를 분석하여 정부의 공공기관 이전의 목적을 달성하였는지 정책방면의 효율성을 분석하는 것이다. 분석을 위해 2009년부터 2019년까지의 한국주택금융공사의 결산경영공시와 공공기관 실적평가보고서를 바탕으로 효율성을 한국주택금융공사의 이전 전·후를 DEA 분석, 경영실적평가보고서상의 업무효율, 재무비율을 이용하여 비모수적 검증방법을 이용하여 비교 분석하였다. 분석결과는 다음과 같다. 첫째, DEA 분석의 경우 지방 이전 전·후 효율성의 차이는 두드러지게 나타나지 않았다. 둘째, 실적평가보고서와 재무비율을 사용한 효율성 분석에서는 지방 이전 후 효율성이 하락한 것으로 나타났다. 분석결과를 종합하면 한국주택금융공사의 경우 지방 이전 이후 효율성이 감소하였는데, 이는 사업성과의 부진과 재무비율과 관련된 비효율성을 원인으로 둘 수 있다. 하지만 본 연구는 한국주택금융공사를 대상으로 분석하였기 때문에 한계점을 가진다. 이를 보완하기 위해 국내 모든 기금관리형 공공기관을 대상으로 연구범위의 다각화가 필요하다. 그럼에도 불구하고 본 연구는 기금관리형 준정부기관을 대상으로 이전 전·후를 분석한 최초의 연구이며, 추후 논의될 공공기관 이전 정책에 유의한 시사점을 제공할 것으로 기대한다.

• Applied Microscopy
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• 제50권
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• pp.17.1-17.9
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• 2020

Recent advances in fabrication have enabled radial-junction architectures for cost-effective and high-performance optoelectronic devices. Unlike a planar PN junction, a radial-junction geometry maximizes the optical interaction in the three-dimensional (3D) structures, while effectively extracting the generated carriers via the conformal PN junction. In this paper, we report characterizations of radial PN junctions that consist of p-type Si micropillars created by deep reactive-ion etching (DRIE) and an n-type layer formed by phosphorus gas diffusion. We use electron-beam induced current (EBIC) microscopy to access the 3D junction profile from the sidewall of the pillars. Our EBIC images reveal uniform PN junctions conformally constructed on the 3D pillar array. Based on Monte-Carlo simulations and EBIC modeling, we estimate local carrier separation/collection efficiency that reflects the quality of the PN junction. We find the EBIC efficiency of the pillar array increases with the incident electron beam energy, consistent with the EBIC behaviors observed in a high-quality planar PN junction. The magnitude of the EBIC efficiency of our pillar array is about 70% at 10 kV, slightly lower than that of the planar device (≈ 81%). We suggest that this reduction could be attributed to the unpassivated pillar surface and the unintended recombination centers in the pillar cores introduced during the DRIE processes. Our results support that the depth-dependent EBIC approach is ideally suitable for evaluating PN junctions formed on micro/nanostructured semiconductors with various geometry.

• Current Optics and Photonics
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• 제6권1호
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• pp.23-31
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• 2022

Heterodyne efficiency is an indicator to evaluate the performance of space coherent laser communication systems. It is affected by signal light and local oscillator (LO) light amplitude, phase and polarization state. In this paper, based on the common heterodyne efficiency, a heterodyne efficiency model that can reflect polarization aberration of optical system is proposed. The heterodyne efficiency is analyzed when the signal light and the LO light are linearly polarized or circularly polarized. For a coherent communication optical system, when the incident signal light is right-circularly polarized light and the incident LO light is 45° linear polarized light. Based on the three-dimensional ray tracing theory and the heterodyne efficiency proposed in this paper, the change of polarization states and the distribution of heterodyne efficiency of the signal light and LO light influenced by the optical system's polarization aberration are analyzed. Analysis shows that the heterodyne efficiency model proposed in this paper can be used to evaluate coherent communication systems and reflect the influence of optical system polarization aberration.