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이홍주,조영희,한남수 한국항공우주학회 2015 한국항공우주학회 학술발표회 논문집 Vol.2015 No.11
항공기-장착물 통합이란 항공기에 장착물을 탑재하고 운용하기 위하여, 대상 항공기와 장착물을 개조 및 연동하고 요구된 성능 및 비행안전 적합성을 확인하는 일련의 활동이다. 항공기에 장착물을 탑재, 운용할 경우 항공기 주변의 유동이 변할 뿐만 아니라 하중, 진동, 전자기 등의 환경조건이 변하므로 새로운 항공기-장착물 조합에 대하여 성능 및 비행안전성을 확인하는 것은 필수적이다. 본 논문에서는 군용항공기에 대하여 항공기-장착물 적합성에 관해 소개하고, 항공기-장착물 통합 시에 비행안전성을 확인하는 감항인증 절차와 기준을 분석하였으며, 한국과 미국, 유럽의 장착물 통합 감항인증기준을 비교하였다. Aircraft-store integration is an activity for verifying captive carriage and employment of a store to an aircraft. It contains modification and interconnection to make performance and flight safety meet their requirements. Because carriage and employment of a store change not only the airflow around the aircraft, but the flight loads, environmental conditions such as vibration, electromagnetic effects, validation of flight safety for a new aircraft-store configuration is essential. This paper presents aircraft-store compatibility, military airworthiness certification system, procedure and criteria regarding to aircraft-store integration. It also compares the store integration chapter of Korean Military Standard ACC with MIL-HDBK-516C and EMACC.
이홍주,박성주,김종우 한국경영과학회 2006 한국경영과학회지 Vol.31 No.2
The Collaborative Filtering (CF) is one of the popular techniques for personalization in e-commerce storefronts. For CF-based recommendation, every customer needs to provide subjective evaluation ratings for some products based on his/her preference. Also, if an e-commerce site recommends a new product, some customers should rate it. However, there is no in-depth investigation on the impacts on recommendation performance of two number of ratings, i.e. the number of ratings of an individual customer and the number of ratings of an item, even though these are important factors to determine performance of CF methods. In this study, using publicly available EachMovie data set, we empirically investigate the relationships between the two number of ratings and the performance of CF. For the purpose, three analyses were executed. The first and second analyses were performed to investigate the relationship between the number of ratings of a particular customer and the recommendation performance of CF. In the third analysis, we investigate the relationship between the number of ratings on a particular item and the recommendation performance of CF. From these experiments, we can find that there are thresholds in terms of the number of ratings below which the recommendation performances increase monotonically. That is, the number of ratings of a customer and the number of ratings on an item are critical to the recommendation performance of CF when the number of ratings is less than the thresholds, but the value of the ratings decreases after the numbers of ratings pass the thresholds. The results of the experiments provide insight to making operational decisions concerning collaborative filtering in practice.
이홍주,김수한 대한상하수도학회 2014 상하수도학회지 Vol.28 No.4
Ultrapure water (UPW) is water containing nothing but water molecule (H2O). The use of UPW is increasing in many industries such as the thermal and nuclear power plants, petrochemical plants, and semiconductor manufacturers. In order to produce UPW, several unit processes such as ion exchange, reverse osmosis (RO), ultraviolet (UV) oxidation should be efficiently arranged. In particular, RO process should remove not only ions but also low molecular weight (LMW) organic matters in UPW production system. But, the LMW organic matter removal data of RO membranes provided by manufacturers does not seem to be reasonable because they tested the removal in high concentration conditions like 1,000 ppm of isopropyl alcohol (IPA, MW=60.1). In this study, bench-scale experiments were carried out using 4-inches RO modules. IPA was used as a model LMW organic matter with low concentration conditions less than 1 ppm as total organic carbon (TOC). As a result, the IPA removal data by manufacturers turned out to be trustable because the effect of feed concentration on the IPA removal was negligble while the IPA removal efficiency became higher at higher permeate flux.
이홍주,김순규 대한기계학회 1989 대한기계학회논문집 Vol.13 No.2
본 연구에서는 높은 열확산의 재료까지도 수용할 수 있도록 시편의 전면 전체를 가열하는 기존의 방법으로부터, 가열하는 시편 전면의 면적을 그 중심으로 부터 임의로 조절하여 축 및 반경방향의 열흐름을 강화시켜, 반경방향의 온도를 측정한 후 이를 이용하여 열확산계수를 구할 수 있는 방정식을 제시하였다. 방정식에서는 시편의 전.후면은 물론 열원의 방사시간도 함께 다루었다. For the extension of the flash method the heat diffusion equation with heat loss and with an arbitrary heat pulse is mathematically analyzed. In the analysis the heat loss includes the axial and radial directions on the front, rear and peripheral surfaces. The heat pulse is irradiated from the source to the front surface of the sample and the heat receiving area on the front surface is controlled by the apertures of an optical system. From this analysis the thermal diffusivity of the samples can be determined more precisely than before by the data reduction method using various percent time. The data can be obtained by the extended radial flash technique adjusted correctly the heating area on the central part of the front surface with a proper aperture or the conventional axial flash technique heated uniformly all parts of the front surface.