• 한국태양에너지학회 논문집
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• 제33권2호
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• pp.56-63
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• 2013

Daylighting system is an alternative lighting system using daylight collecting device, light transformer and light diffuser. In this paper, we developed a daylighting system in which the collecting device composed by dual parabolic reflectors, the silica optical fiber adapted to the light transformer and light diffuser made of the polyglass square sheet. We have estimated the system efficiency and general color rendering index(Ra) of the developed system. The system efficiency measured to 23.8% and Ra was revealed as 95. Ra number of the developed system is bigger than the number(65) of the previous fresnel lens based sunlight collector.

• 한국컴퓨터정보학회논문지
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• 제21권1호
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• pp.107-113
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• 2016

In this paper, by managing the biometric data is changed with the passage of time, a systematic and scientifically propose a framework to increase the bio-vector generation efficiency of the smart health care. Increasing the development of human life as a medicine and has emerged smart health care according to this. Organic and efficient health management becomes possible to generate a vector when the biological domain to the wireless communication infrastructure based on the measurement of the health status and to take action in accordance with the change of the physical condition. In this paper, we propose a framework to create a bio-vector that contains information about the current state of health of the person. In the proposed framework, Bio vectors may be generated by collecting the biometric data such as blood pressure, pulse, body weight. Biometric data is the raw data from the bio-vector. The scope of the primary data can be set to active. As the collecting biometric data from multiple items of the bio-recognition vectors may increase. The resulting bio-vector is used as a measure to determine the current health of the person. Bio-vector generating the proposed framework, it can aid in the efficiency and systemic health of healthcare for the individual.

• 한국연초학회지
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• 제27권1호
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• pp.120-126
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• 2005

The Fishtail Chimney system mounted on 1 channel smoking machine is not appropriate for the routine analysis of sidestream smoke, because of its low repeatability and very long time required for smoke collection. To overcome this inconvenience, we developed a new sidestream smoke collecting apparatus compatible for 8 channel linear smoking machine. An electric motor driven stroke and automatic control system were adopted in this device to maximize convenience and efficiency of its operation. Also, we carried out the international collaborative study on monitoring sidestream smoke analysis to test the performance of this system. From the statistical analysis of the data obtained in our laboratory and other participating labs, it has been indicated that the newly developed sidestream smoke collection apparatus could be applicable to the routine analysis of sidestream smoke.

• The Journal of Asian Finance, Economics and Business
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• 제7권7호
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• pp.439-451
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• 2020

This study focused on researching the factors affecting retail banking efficiency of Vietcombank branches in the Mekong-Delta region. By collecting data from financial statements from 15 branches of VCB in the Mekong-Delta Region between 2015 and 2018, the paper applies DEA estimation to measure the effectiveness of retail banking activities and uses the Tobit regression model to identify factors affecting retail banking efficiency. The results demonstrate that the retail banking efficiency of branches averaged 52.5% during the period. The rating result shows the branches in An Giang, Can Tho, Dong Thap, Kien Giang, Long An, Phu Quoc and Tra Noc rank at the top technical efficiency. In group of medium efficiency, there are branches in Soc Trang, Tien Giang and Vinh Long. In the category of the poor efficiency are the branches in Bac Lieu, Ben Tre, Ca Mau, Chau Doc and Tra Vinh. The results also show that bank scale-related factors, capital adequacy, credit quality, time specific and region impact significantly the retail banking efficiency. The research not, only contributes to enriching the empirical research method but also is significant for the management activities in business developing strategies, improving the operational efficiency of Vietcombank in the region.

• 한국농공학회지
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• 제45권6호
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• pp.136-143
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• 2003

This study is performed to evaluate performance of the developed pipe when using for underground drainage in fm land, the efficiency of the pipe is examined such as quantity of drainage, water temperature and other field performance in all weather condition. Results of this study, the higher permeability through wall of the pipe is achieved by making various size pores using open-graded aggregate. And in all weather conditions, permeable polymer concrete pipe perform much better than conventional perforated pipes. During rice farming period, quantity of drainage the permeable polymer concrete pipe is 1.25 time greater than conventional perforated pipes. Therefore, use of the permeable polymer concrete pipe is greater advantages when considering collecting and draining capacity compared with conventional perforated pipes.

• 한국정보과학회논문지:컴퓨팅의 실제 및 레터
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• 제15권7호
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• pp.515-519
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• 2009

센서 노드의 활용 분야가 점차 다양화되는 추세이므로 활용 분야에 적합한 다양한 데이터 수집 방법이 요구된다. 데이터의 실시간 감시가 불필요한 경우 수집과 동시에 전송을 수행하는 현재의 데이터 수집 방법은 불필요한 전력 소모 및 데이터 손실을 발생시킬 수 있다. 데이터를 수집한 노드가 데이터를 저장하고 질의에 의해 필요한 데이터를 획득하는 새로운 방법이 요구된다. NAND 플래시는 에너지 효율성이 좋고 대용량화가 쉬워 앞으로의 센서 노드용 저장소로 적합하다. 센서 노드는 4${\sim}$10 KByte의 적은 메모리를 지원하고 NAND 플래시는 덮어쓰기가 불가하고 쓰기 제한이 있어 효율성이 뛰어난 파일 시스템의 구축은 어렵다. 본 논문은 센서 노드 환경에서 대용량 NAND 플래시 파일 시스템의 설계에 대해 논한다. 파일 시스템은 전송 비용을 줄여 보다 장시간 동안의 데이터 수집을 가능하게 한다. 앞으로 다양한 분야에 적용되어 센서 네트워크 환경에서 핵심 구실을 할 것으로 예상한다.

• 해양환경안전학회지
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• 제14권1호
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• pp.15-20
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• 2008

오염된 퇴적물은 연안의 생태계 파괴에 근본적인 원인이 되고 있음에 따라, 선진 외국에서는 1960년대부터 이러한 문제 해결을 위한 새로울 기술개발을 진행하여 오고 있다. 본 연구에서는 유기퇴적물 수거를 위한 시스템 설계 및 개발에 있어서 오탁확산에 의한 2차 오염을 방지하거나 최소화 할 수 있는 Pilot 규모 형태의 흡입식 펌프 준설 시스템을 설계 제작하였으며, 시스템의 성능시험을 통한 적용 가능성을 제시하였다. 시스템 최적화를 위하여 수치해석기법을 통한 퇴적물 수거 시스템의 형상에 대한 성능평가를 수행하고, 제작 시스템의 성능시험에 있어서는 시스템의 정지 상태와 이동 상태에서의 퇴적물 수거 성능에 대한 실험을 수행하였다. 본 연구를 통하여 해저 유기퇴적물의 상부만을 준설할 수 있는 시스템의 개발 가능성을 확인하였다.

• 해양환경안전학회:학술대회논문집
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• 해양환경안전학회 2007년도 추계학술발표회
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• pp.91-95
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• 2007

본 연구는 해양에 유입되는 부유폐기물을 효과적으로 수거할 수 있는 시스템을 개발하고자, 우기철에 폐기물의 성상을 조사한 전보의 예비조사와 기초실험 결과를 바탕으로 각 장치의 구조와 규격을 확정하고 해상에서 그 성능 검증을 수행하였다. 그 결과 본 시스템의 구집기구는 전개장치의 전개력에 의해 선박 진행시 1회에 수평방향으로 15m이상의 해역을 소해하는 것으로 나타나 현행 폐기물 수거선박보다는 수거 효율이 매우 높았으며, 폐기물이 최종적으로 유입되는 Net의 수면상 높이는 예인속도 5kt이내에서 50cm이상을 유지하여 폐기물의 유입성능이 우수함을 알 수 있었다. 또한 부유 폐기물 수거실험에서는 매 실험 당 평균 약 200kg 정도의 폐기물이 그물망을 가득 채워 본 연구에서 고안한 수거시스템의 성능은 매우 양호한 것을 확인할 수 있었다.

• 한국기계가공학회지
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• 제18권1호
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• pp.16-23
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• 2019

Cooking oil in kitchen-fog is the most harmful factor to the health of a cook. The proposed filter is a tool that protects the cooked state, to prevent users from inhaling oil mist in the kitchen. Due to efficiency issues, existing filters are of the mesh type or baffle type. In this paper, CFD analysis is carried out to select a filter with low pressure loss and low efficiency, and to attach the sub-filter to improve efficiency. The results of the analysis on the collection efficiency and pressure loss of three sub-filters, i.e., circle type, droplet type, and cone type, showed that the collection efficiency was 64.09% and the pressure loss was 1.26 mmAq when the circle type sub-filter was applied. The position of the sub-filter showed the best efficiency and pressure loss when it was located at the bottom of the center of the gap of the main filter.

• Journal of Biosystems Engineering
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• 제41권4호
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• pp.281-287
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• 2016

Purpose: The purpose of this study is to develop a walking-type two-row sesame reaper, which can simultaneously perform the cutting and collecting of sesame plants and other crops like perilla and soybean. Methods: The factors involved in reaping sesame were determined experimentally in order to design a prototype of the sesame reaper. The prototype is made up of four parts for cutting, conveying, collecting, and running. The height of two disc-plate saw blades on the cutting part is adjusted by an adjusting wheel, and peripheral speed is adjusted in accordance with the running speed. The conveying belt of the conveying part can be tilted from $0^{\circ}$ to $90^{\circ}$. The collecting part extracts a predetermined amount of transferred sesame plants. The prototype was used to evaluate the performance at different working speeds, so that the work efficiency can be calculated. Results: The center of gravity of the sesame plants was 900 mm, measured from the end of the cut stem. The diameter of the disc-plate saw blade was determined to be 355 mm, peripheral speed was 20.4-32.7 m/s, and the picking height of the conveying belt for sesame was 130 mm. The performance of transfer and collection of the sesame, when the insertion angles were $60^{\circ}$ and $90^{\circ}$, proved to be excellent. However, when the angle was over $120^{\circ}$, the performance was only 75-80%. The performance was at 100% efficiency when the ratio between running speed and conveying belt speed of the prototype was 1:2, which seems to be the ideal ratio for the sesame reaper. Conclusions: A sesame reaper was developed, which can integrate the processes of cutting, conveying, and collecting, by investigating and considering various factors involved in the reaping process. The sesame reaper can reduce the costs for yielding and producing sesame due to its highly efficient performance.