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전자 도서관 도메인에서 의미적 관계를 이용한 개인화된 논문 추천 시스템
최호연(Hoyeon Choi),신동욱(Dongwook Shin),최중민(Joongmin Choi),김정선(Jungsun Kim) 한국정보과학회 2013 정보과학회논문지 : 소프트웨어 및 응용 Vol.40 No.3
오늘날 연구자는 전자 도서관을 통해 많은 논문에 쉽고 빠르게 접근할 수 있으나 동시에 정보 과잉으로 인해 자신이 원하는 적절한 논문을 찾기 위해 많은 시간과 노력을 소비해야 한다. 이러한 문제를 개선하기 위해 연구자의 선호 분야를 반영해 연구자에게 적절한 논문을 추천해주는 개인화된 논문 추천 시스템이 제안되었다. 개인화된 논문 추천 시스템은 텍스트 기반 추천방식에 적합한 콘텐츠 기반 필터링을 사용해 많이 연구되었으나 과거 제안된 연구는 단어의 구문론적 관계만 고려하고 의미론적 관계는 고려하지 않은 한계가 있다. 이를 개선하기 위해 본 논문은 콘텐츠 기반 필터링에 잠재적 의미 관계를 적용한 PARuS(Personalized Academic Paper Recommender using Semantic Relation in Digital Library Domain)를 제안한다. PARuS는 연구자의 논문 리스트를 이용해 연구자 선호 특징 정보를 구축하고 구축된 연구자 선호 특징 정보와 추천할 후보 논문 간 구문론적 관계와 잠재적 의미 관계를 함께 고려해 연구자에게 논문을 추천한다. 본 논문은 구문론적 관계만 고려한 이전 연구와의 비교평가를 통해 PARuS의 효율성을 평가하였고, 그 결과 PARuS가 더 높은 성능을 보임을 확인하였다. Today, researchers can access many different academic papers easily and quickly through digital libraries but at the same time, researchers spend more time and effort to find relevant academic papers that they want. To alleviate these problems, personalized academic paper recommenders, which recommend relevant academic papers to researchers considering researcher’s interests have been proposed. Personalized academic paper recommenders using the content based filtering method have been actively studied because they properly recommend relevant text documents to users. However, those recommenders using the content based filtering method only consider the syntactic relation and exclude the semantic relation. To resolve this problem, we propose PARuS(Personalized Academic Paper Recommender using Semantic Relation in Digital Library Domain), which is a personalized academic paper recommender using the content based filtering method reflecting the latent semantic relations. PARuS constructs the researcher’s preference feature information based on researcher"s publication list, and then PARuS recommends relevant academic papers reflecting the syntactic relation and the latent semantic relation between researcher’s preference feature information and candidate academic papers. In this paper, we evaluate the performance of PARuS and shows its improved effectiveness over previous method.
최호연(Ho-Yeon Choi),김기현(Ki-Hyun Kim),신형섭(Hyung-Seop Shin),박종서(Jong-Seo Park),이해무(Hae-Moo Lee) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.3
The toughness data obtained from Charpy impact tests are presented by a temperature-energy relationship. Data fitting for quantitative comparing of transition temperature with upper shelf energy, ductile-brittle transition, in other words, the representation with general mathematical model equation for energy variation according to the temperature is necessary. In this study, the Charpy impact tests to two kinds of the representative steel were carried out as a work for the material property standardization technique development. The fitting procedure of the scattering in data according to materials and temperature in the transition region was described. The data fitting procedure was established through the variances treatment in the transition region using the tangent hyperbolic function.
스윙 모션을 동반한 4-way 카세트 천장형 에어컨 기류의 냉방성능 및 열쾌적성 분석 및 평가
최호연(Ho Yeon Choi),오재현,박용갑(Yong Gap Park),하만영(Man Yong Ha) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
A numerical simulation would be carried out using CFD to compare the cooling performance and Thermal comfort of 4-way cassette Air-conditioner when its vane is maintained to constant angle or moving. To evaluate the flow from indoor unit, cooling speed, Draft rate and ADPI calculation is used as well as distribution of air temperature and velocity. The CFD simulation was carried out using commercial CFD code, Fluent, based on Finite Volume Method(FVM). To validate CFD results, comparison with experiment was conducted. The CFD result show the good agreement with experimental result within 2%. The results in this paper indicate that the swing motion of vane increase the cooling speed due to the wide discharge airflow compared with fixed vane. And it improve thermal comfort felt by occupants.
항공용 가스터빈엔진 오일쿨러의 설치 위치에 따른 열-수력학적 성능에 관한 수치적 연구
최호연(Ho Yeon Choi),김민성(Minsung Kim),하만영(Man Yeong Ha),민준기(June Kee Min) 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.11
In an aero gas-turbine engine, the heat exchanger is needed to cool the oil system for the gearboxes and electric devices. Among the various type of heat exchanger, Surface air-oil heat exchanger with plate-fin is used for enhanced heat transfer characteristics. The plate-fin type SAOHE was modeled using two-dimensional porous approximation for the fin region to evaluate the aero-thermal performance of SAOHE. Governing equations of mass, momentum, and energy equations for compressible turbulent flow were solved using ideal-gas assumption for the air flow. The six mounting locations were considered on the engine core and casing sides. Using the porous media model, the pressure drop and heat transfer performance of the heat exchanger were predicted, and the results were compared with three-dimensional computational fluid dynamics results and experiment data for validation.
최호연(Ho-Yeon Choi),김기현(Ki-hyun Kim),정영진(Young-Jin Jeong),신형섭(Hyung-Seop Shin) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
The friction welding of Cu-based similar and dissimilar BMGs has been tried utilizing the superplastic-like deformation behavior of BMG in the supercooled liquid region. The apparatus for friction welding of BMGs adopting a pneumatic cylinder and gripper based on a conventional lathe was constructed. The friction pressure and the friction time were in the range of 100~200 ㎫ and 0.4~1.0 sec, respectively. The rotation speed was constant as 1800 RPM. The friction welding of a similar Cu₄?Zr₄?Ag?Al?/Cu₄?Zr₄?Ag?Al? BMG alloy and a dissimilar Cu₄?Zr₄?Ag?Al?/Zr??Al₁?Ni?Cu₃? BMG alloy has been tried. In order to characterize the properties after friction welding, various crystallographic techniques and property evaluation procedures were adopted. Finally, the residual strength after friction welding was evaluated by the tensile testing.
격자 볼츠만 법을 이용한 이질표면 위에 존재하는 액적의 크기 변화에 따른 거동의 3차원 수치해석 연구
최호연(H.Y. Choi),손성완(S.W. Son),하만영(M.Y. Ha) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
The characteristic of the droplet located on a heterogeneous surface is numerically analyzed using the 3-D Lattice Boltzmann Method(LBM). LBM is having an advantage of the two phase flow. Predictions are made whether the droplet will be separated or not. The separation time is affected according to changes of the contact angles of the hydrophilic and hydrophobic surface, and the droplet size. The droplet separation mechanism is investigated by analyzing the velocity vector around the phase boundary line and shape of the droplet. If the difference between the contact angles of the hydrophilic and hydrophobic surfaces is bigger, a droplet located at the center of a heterogeneous surface shows a trend of being easily separated. The droplet separation time increases according to the decrease of contact angle of hydrophobic surface, and the more the contact angle of the hydrophobic surface increases, the more the droplet separation time decreases. Also, the droplet separation time shows a decreasing trend when the droplet size decreases. Furthermore, the result show that separation time and the map of droplet separation changed with respect to the droplet size.