• 대한안전경영과학회지
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• 제17권4호
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• pp.87-96
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• 2015

This study analyzed the safety management efficiency through input-oriented BCC Model using DEA by making of Models, in which this study selected the number of staff affiliated with the construction site, number of staff members on the construction team, and number of safety personnel as Input Factor, along with the number of disaster victims and zero-accident accomplished hours as output elements, targeting 40-or-so apartment building construction sites which are being built by 3 domestic construction companies. As a result of efficiency, it was 0.643, the number of efficient DMU was 4. In the aspect of returns to scale, 21 construction sites(52.5%) found to be in a state of increasing returns while 14 construction sites(35%) was in a state of Decreasing returns. The reason for inefficiency was found to lie in technical factors in case of 30 construction sites(75%). Lastly, inefficient DMU is in need of 38.9 % and 66% reduction in site personnel and safety personnel. Based on study results, the 29 construction sites accounting for 72.5% of DMU for safety management efficiency evaluation object turned out to do inefficient safety management that doesn't fit the size of each company.

• The Journal of Asian Finance, Economics and Business
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• 제5권4호
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• pp.187-199
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• 2018

This study examined the effects of startup firm's knowledge assets on the effectiveness of their sales strategies, efficiency of sales activities, and management performance, after categorizing these assets into customer knowledge assets and technology knowledge assets. Furthermore, the moderating effects of promotion focus by CEOs and sales managers of startup firms were analyzed. For the analysis, dyadic questionnaire surveys were conducted targeting the CEOs and sales managers of startup firms established at the Gyeongnam Technopark and the KAIST Technology Business Incubation Center in Korea. Hypotheses were verified through structural equation modeling, and moderating effects were identified through ANOVA. CEO's customer knowledge asset strengthened their effectiveness of sales strategies, and sales manager's technology knowledge asset strengthened the efficiency of their sales activities. Also, CEO's effectiveness of sales strategies and sales manager's efficiency of sales activities have been found to enhance startup firm's management performance. Meanwhile, the moderating effect of promotion focus strengthened CEO's effectiveness of sales strategies through CEO's customer knowledge asset and interaction as CEO's promotion focus level increased, but promotion focus of sales managers did not have any significant interaction effect. This study provides implications by offering empirical evidence on startup firms with regard to knowledge assets.

• 한국군사과학기술학회지
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• 제13권4호
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• pp.577-585
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• 2010

The Military Tactical Communication technology for effective network-centric warfare is developing. Targeting broadband wireless transmission, core technology for connection, and Transmission technology that secure survivability under High-speed Movement environment. On the one hand, Tactical data communication system that reflects military characteristic is developing on the base of Legacy communication equipment which is used in the field. Because almost every military units in the field have used voice to communicate which lower efficiency of operation, they have made effort to Substitute voice communication which delays military Operation Tempo to digital communication. The Communications environment of troops in Forward edge of battle field area is very poor. Especially in terms of limited frequency allocation and bandwidth. Therefore, improving the efficiency of frequency is essential for Military Tactical Communication. This paper is about The Data Compression Method for increase of Efficiency in Tactical Data Communication over Legacy Radios which are UHF, VHF, HF Radio. I proposed and proved the most efficient Data Compression Method that reflects military characteristic, after analyzing the experimentation, which simulate CAS(Close Air Support mission) data transmission between Pilot and TACP.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2013년도 추계 학술논문 발표대회
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• pp.96-97
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• 2013

PC(Precast Concrete) technology has been widely used for reduction of construction period and manpower in domestic construction industry since it was introduced from advanced countries in the 1960s. But most of existing researches are shortage of research which proves the efficiency of PC methods quantitatively. Therefore, this study analyzed productivity targeting construction site workers who are working on projects using the PCF(Precast Concrete Frame) system out of PC methods that is used most typically in construction sites, and in order to provide basic data to prove the efficiency of PC project quantitatively.

• 아태비즈니스연구
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• 제10권3호
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• pp.37-51
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• 2019

In this paper, we investigate the performance of anomaly factors in Asia-Pacific Stock market and show the higher Sharpe ratio of the volatility managed smart beta portfolio. The smart beta portfolio combines the benefit of passive strategy and active strategy. However, the smart beta portfolios are seems to be exposed to the risk of anomaly factors from the perspective of traditional financial equilibrium model. Therefore, the smart beta strategy may generate negatively skewed returns unappealing to investors having lower risk tolerance. Our empirical investigations find that the return of the Asia-Pacific region stock market is more volatile than other regions with the lower efficiency ratio. However, the value factor and the momentum factor of Asia-Pacific region both show good performances. More interestingly, we also find that managing the volatility of the momentum factor in Asia-Pacific stock market almost doubles the efficiency ratio.

• 국제학술발표논문집
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• The 6th International Conference on Construction Engineering and Project Management
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• pp.706-707
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• 2015

Our country is aiming at 30% reductions in building energy consumption accounting for 39% of the total energy consumption by 2020[1]. For this purpose, the government is developing and applying the Building Energy Management System (hereinafter, referred to as "BEMS", Smart plug, etc.) while the researches on new renewable energy development. BEMS, which is applied with focus on large buildings, is inducing energy management of the entire building through energy measurement and data management, but considering its economic efficiency, it's very difficult to apply BEMS to small & medium-size buildings. Hereupon, this study intends to implement the case analysis of deterioration and economic efficiency of major equipment in buildings on the basis of electricity consumption which has been measured targeting small & medium-size buildings for a certain period by taking into account that equipment deterioration is a contributor to the increase in energy consumption.

• 한국입자에어로졸학회지
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• 제19권3호
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• pp.77-87
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• 2023

We present the development of a wetcyclone sampler designed for the sampling of airborne bacteria. The wetcyclone design involves a combination of two traditional cyclone shapes and computational fluid dynamics (CFD) analysis to validate its effectiveness in terms of pressure drop and collection efficiency. The wetcyclone exhibits a collection efficiency of over 90% for bacteria, specifically targeting Staphylococcus aureus. Additionally, the wetcyclone enables continuous bioaerosol sampling using a liquid medium (deionized water), demonstrating a concentration ratio exceeding >105 and a stable microbial recovery rate of 81.9%. The application of real-time quantitative polymerase chain reaction (qPCR) and the colony counting method ensures precise measurement of the concentration ratio and microbial recovery rate.

• Journal of Computing Science and Engineering
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• 제12권1호
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• pp.24-35
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• 2018

Deep convolutional neural network (DCNN) is an advanced technology in image recognition. Because of extreme computing resource requirements, DCNN implementation with software alone cannot achieve real-time requirement. Therefore, the need to implement DCNN accelerator hardware is increasing. In this paper, we present a field programmable gate array (FPGA)-based hardware accelerator design of DCNN targeting handwritten Hangul character recognition application. Also, we present design optimization techniques in SDAccel environments for searching the optimal FPGA design space. The techniques we used include memory access optimization and computing unit parallelism, and data conversion. We achieved about 11.19 ms recognition time per character with Xilinx FPGA accelerator. Our design optimization was performed with Xilinx HLS and SDAccel environment targeting Kintex XCKU115 FPGA from Xilinx. Our design outperforms CPU in terms of energy efficiency (the number of samples per unit energy) by 5.88 times, and GPGPU in terms of energy efficiency by 5 times. We expect the research results will be an alternative to GPGPU solution for real-time applications, especially in data centers or server farms where energy consumption is a critical problem.

• 폴리머
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• 제31권5호
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• pp.454-459
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• 2007

본 연구에서는 folic acid(FA)가 복합화된 저분자량 수용성 키토산(LMWSC) 나노입자(water soluble chitosan-folic acid nanoparticle, WSCFA)를 제조하고, 또한 DNA와 나노복합체 합성 및 특성을 분석함으로써 in vitro에서 세포내 독성을 평가하였다. WSCFA 합성을 확인하기 위하여 분광학적 분석 방법을 사용하여 분석하였으며, WSCFA 나노입자는 110 nm 이하의 입자 크기인 구형의 형태를 가지고 있음을 알 수 있었다. In vitro 세포내 독성 실험에서, WSCFA-DNA 복합체는 세포내 독성을 전혀 나타내지 않음으로 높은 세포 생존율을 보여주었다. 전기영동 실험을 통해 WSCFA의 DNA 응축능력을 확인하였고, in vitro에서의 전이효율은 형광 광도계에 의해 평가하였다.

• 문화기술의 융합
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• 제9권3호
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• pp.753-761
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• 2023

본 연구는 비전공자를 대상으로 하는 프로그래밍 교과목에 플립드 러닝 교수법을 적용하여 프로그래밍 교과목에 대한 학습 효율성을 증대시키기 위한 전략을 연구한다. 전통적 수업 방식에서 벗어나 다양한 교수법, 학습 설계모형을 융합적으로 적용하여 비전공자를 대상으로 하는 소프트웨어 교육의 효율적인 학습 모델을 설계하는 것에 대하여 연구한다. 학습자 중심의 플립드러닝(Flipped Learning)기반 프로그래밍 수업을 설계하고 이를 현장 적용하는데 효과적인 적용 방법에 대한 전략을 모색한다. 또한 본 대학의 교양 수업 중 컴퓨팅 사고 교과목에 플립드러닝 교수법의 효율적 적용 방법을 탐색하는 데 그 목적이 있다. 혁신 교수법의 하나인 플립드러닝 교수법을 적용하여 프로그래밍 교과목 수업의 질적 개선과 실습교육의 효율성 및 학습자 성취도 증진을 위한 방안을 고찰한다. 본 연구에서는 전통적 수업 방식에서 벗어나 다양한 교수법, 학습 설계 모형을 융합적으로 적용하여 비전공자를 대상으로 하는 소프트웨어 교육의 효율적인 학습 모델을 설계하는 것이 목적이다.