• 한국항공운항학회:학술대회논문집
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• 한국항공운항학회 2016년도 춘계학술대회
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• pp.9-13
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• 2016

Reaction drive rotor system is capable of providing hover and low speed capabilities to different aircraft concepts such as stopped rotor wing, canard rotor wing, compound gyroplane etc. Existing sizing and analysis tools for shaft drive rotor system cannot be applied directly to this system. The available methodologies to size this system were reviewed. Power available calculation procedure and factors affects it were addressed prior to sizing process. Various design issues of this system due to interrelationship of internal gas flow dynamics and rotor external aerodynamics was discussed. Finally, a modification that is required in existing sizing methodologies was identified and combined approach in sizing process to consider the interrelationship among engine, rotor and blade duct was introduced.

• 대한인간공학회지
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• 제24권4호
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• pp.31-37
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• 2005

Resulting anthropometric data recently measured and cataloged through 5th national anthropometric survey that is called Size Korea is highly useful in clothing industries. This study aims at suggesting a statistical methodology for apparel sizing that reflects recent changes in Korean anthropometry and improves customer fitness. Based on previous research on body types such as triangular, rectangular, inverted body types, etc., factors that represent human sizes were extracted and then clustered into groups by their body types. These body type-based groups with respect to the factors obtained yielded a sizing system of which the interval of each factor is of equi-distance by their factor scores. However, each interval of the sizing system is non-linear in terms of individual anthropometric variables. The sizing system being proposed in this study was compared to that of KS K 0050 and had a broader coverage for the Korean population surveyed. The apparel sizing scheme is expected to improve customer fitness when applied to garment sizing and to provide more information on what percentage of population is included in each classification.

• 항공우주기술
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• 제11권1호
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• pp.1-6
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• 2012

인공위성의 전력 시스템을 보호하기 위해서 퓨즈나 LCL (Latching Current Limiter) 등을 부하와 전원 공급 장치 사이에 연결한다. 본 논문에서는 인공위성에서 장착되는 퓨즈의 용량 선정 기법에 대해 논하였다. 퓨즈 용량 선정 방법에 대해 기술하였고, 병렬 (Parallel) 퓨즈 연결 방식을 수학식으로도 단일 (Single) 퓨즈 연결 방식으로 나타낼 수 있음을 보였다. 또한, 퓨즈에 연결되는 부하의 정확한 전류 특성이 알려지지 않은 상태에서 적절한 퓨즈 선정 기법을 새롭게 제시하였다.

• 한국의류산업학회지
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• 제13권2호
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• pp.205-214
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• 2011

The purpose of this study is to develop a size information providing model which is easy recognition and utilization for customer. This study also implemented web page to apply the size-informational model. Web page implemented using Apache Web Server and JAVA client-side scripting. Research result on the actual condition of fashion electronic commerce, most of the firms are used the old named same with period of 1980. On the same named-code, they are used different sizing systems by firms or items. Size interval is used 2~5 cm, different by firms. In the size information, is provided only named-code(55, 66 etc.) or garment size, and is confusing whether the marked is body size or garment size. Many of the marked size information were wrong. The sizing system of KS K5001(2009) is not used well. These problems are increased a lose customer and firm by return, exchange, mending-cost, stock, etc. Therefore, the problems should be improved by providing correct and detailed information of size and garment, as well as standardization of sizing systems based on KS K5001.

• Journal of Electrical Engineering and Technology
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• 제6권6호
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• pp.731-741
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• 2011

Conventional methodologies (empirical, analytical, numerical, hybrid, etc.) for sizing photovoltaic (PV) systems cannot be used when the relevant meteorological data are not available. To overcome this situation, modern methods based on artificial intelligence techniques have been developed for sizing the PV systems. In the present study, the optimum PV/inverter sizing ratio for grid-connected PV systems with orientation due south and inclination angles of $45^{\circ}$ and $60^{\circ}$ in selected Algerian locations was determined in terms of total system output using type-2 fuzzy logic. Because measured data for the locations chosen were not available, a year of synthetic hourly meteorological data for each location generated by the PVSYST software was used in the simulation.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1995년도 추계학술대회 논문집 학회본부
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• pp.117-119
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• 1995

For an effective application of the cogeneration system for commercial and industrial buildings, we need to develop a relevant model to determine the long-term based optimal sizing of the cogeneration system considering electrical and thermal load demands, buy and sell contracts with electric utility and the annual production cost. In assessing the optimal sizing of cogeneration, we have to consider both economic parameters and their capacity expansion for the increased electrical and thermals demand in the future. In this paper, we propose a mathematical model for the optimal sizing of cogeneration systems considering annual production costs and other economic parameter such as, lifetime of the equipment, time value of the capital, etc. In the case study, we thoroughly examine the effects of the economic parameters and determine the optimal size of the sample system. In addition, we calculate the payback period of the cogeneration investment.

• 펄프종이기술
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• 제36권1호
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• pp.1-8
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• 2004

One of the most frequently used method for measurement of the degree of sizing (viz., hydrophobicity) is the Stockigt test. However, the Stockigt test was influenced by various factors such as dropping height, dropping amount, dropping speed and viewing angle. The resultant data of the sizing degree on the same specimen also varied according to different testers. Thus, the Stockigt test should be modified to be regarded as a highly reliable and reproducible standard method. For modifying the Stockigt test, it was required to quantify red coloration by reaction between 1％ ferric chloride and 2％ ammonium thiocyante during Stockigt testing. The cameras capturing the serial images during the red coloration process were the CMOS (Complementary Metal Oxide Semiconductor)-type and CCD (Charge Coupled Device)-type cameras. For measurement based on KS M 7025, the CCD-type camera must be used due to its high resolution, and on the other hand, for measurement based on Tappi Useful Method 429, the CMOS-type camera may be used owing to its low resolution. It was needed to covert the RGB values of a droplet image into HSV(Hue, Saturation, and Value) values because the human eyes are much closer to HSV than RGB. Among HSV values, the Hue value was accepted as the most reliable index consistent with the red coloration process by excluding the surrounding conditions such as light, tester's movement etc.

• 한국항공우주학회지
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• 제40권6호
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• pp.523-535
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• 2012

태양광 추진 항공기는 감시, 지구 모니터링, 통신 등에 대기 오염 없이 그리고 가까운 장래에 인공위성과의 가격 경쟁력까지 갖추게 될 수 있어 미래의 고고도 장기체공 임무수행을 위해 더욱더 그 중요성이 증대되고 있다. 그러나 전통적인 항공기 사이징 방법들은 태양광 추진 항공기에 바로 적용될 수 없다. 본 연구에서는 다양한 동력 시스템 구성품들이 태양광 추진 장기 체공 항공기의 사이징에 어떤 영향을 미치는지를 파악하기 위하여 에너지 균형 및 구속조건 연구를 수행하였다. 본 연구에서는 동력 생성과 연료전지의 재생 에너지 저장을 위한 광전지 모듈을 동력 시스템 구성품으로 고려하였다. 또한 본 연구 결과를 검증하기 위해 고고도 무인기에 이 새로운 사이징 기법을 적용하여 결과를 제시하였다.

• 대한안전경영과학회지
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• 제9권2호
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• pp.59-69
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• 2007

The main objective of this study is to suggest the new sizing system proper to the boys in the high school students by classifying their somatotype for the development of educational environment and uniform. The sample for this work was chosen from data which were collected and measured by Size Korea during two years $(2003\sim2004)$. In order to analyze feature of the somatotype of boys in the high school students, analysis was performed about 479 subjects on 37 body parts such as height (9 parts), width (5 parts), thickness (6 parts), circumference (7 parts), length (8 parts), body weight and $R\ddot{o}hrer$ Index. The result of this study can be utilized in various fields such as design of classroom, student uniforms, facilities and equipments for education at high school and university, etc.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2000년도 추계학술대회 논문집 학회본부 C
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• pp.616-618
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• 2000

This paper describes the recent research and technical trend of power cable system. Compact sizing with long length and large capacity is the main trend of the power cable. From the manufacturing process to the monitoring of the underground power line, various new techniques are being developed for reliability and high quality such as in-line monitoring system, triple common extrusion, PD measurement system, new type completion test, etc.