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김효상,신원용,김동건,조재희,Kim, Hyo-Sang,Shin, Won-Yong,Kim, Donggeon,Cho, Jaehee 한국정보통신학회 2015 한국정보통신학회논문지 Vol.19 No.12
온라인 소셜 네트워크 서비스 중 하나인 트위터는 가장 보편적으로 사용되는 마이크로 블로그인데, 트위터의 개방적 구조로 인해 자동화 프로그램인 트윗 봇이 많이 생성되고 있다. 이 트윗 봇은 적법한 봇과 악성 봇으로 분류되는데, 이 중 악성 봇은 일반 사용자들에게 많은 양의 스팸 정보나 유해한 컨텐츠를 배포하기 때문에 트윗 봇을 검출하는 작업은 반드시 필요하다. 기존 연구에서는 시간적 정보를 활용하여 사람과 트윗 봇을 분류하였다. 본 논문에서는 사용자들의 고 정밀 위치 정보를 알려주는 공간 태그된 트윗 정보를 활용하여 트위터 사용자들의 정확한 위치와 트윗 전송시각을 알아낸 후, 각 사용자의 시공간 엔트로피를 계산하여 트윗 봇을 검출하는 개선된 두 단계 알고리즘을 제안한다. 주요 결과로써, 시간 정보만을 이용한 기존 연구결과보다 각 신뢰도별 봇 검출 확률 및 거짓 경보 확률이 모두 우수하게 나타난다. Twitter, one of online social network services, is one of the most popular micro-blogs, which generates a large number of automated programs, known as tweet bots because of the open structure of Twitter. While these tweet bots are categorized to legitimate bots and malicious bots, it is important to detect tweet bots since malicious bots spread spam and malicious contents to human users. In the conventional work, temporal information was utilized for the classficiation of human and bot. In this paper, by utilizing geo-tagged tweets that provide high-precision location information of users, we first identify both Twitter users' exact location and the corresponding timestamp, and then propose an improved two-stage tweet bot detection algorithm by computing an entropy based on spatio-temporal information. As a main result, the proposed algorithm shows superior bot detection and false alarm probabilities over the conventional result which only uses temporal information.
김효상(Hyo-Sang Kim),김대현(Dae-Hyun Kim),안효석(Hyo-Sok Ahn),한준희(Junhee Hahn),이우(Lee Woo) 한국트라이볼로지학회 2009 한국트라이볼로지학회 학술대회 Vol.2009 No.11
Tribological properties of nanoporous structured alumina film was investigated. Alumina film (AAO: anodic aluminum oxide) of 2 ㎛ thickness having nanopores of 45 ㎚ diameter with 105 ㎚ interpore-diatance was fabricated by mild anodization process. Reciprocating ball-on-flat sliding friction tests using 1 ㎜ diameter steel ball as a counterpart were carried out with wide range of normal load from 1 mN to 1 N in an ambient environment. The morphology of worn surfaces were analyzed using scanning electron microscopy. The friction coefficient was strongly influenced by the applied normal load. Smooth layer patches were formed on the worn surface of both AAO and steel ball at relatively high load (100 mN and 1 N) due to tribochemical reaction and compaction of wear debris. These tribolayers contributed to the lower friction at high loads. Extremely thin layer patches, due to mild plastic deformation of surface layer, were sparsely distributed on the worn surface of AAO at low loads (1 mN and 10 mN) without the evidence of tribochemical reaction. Delaminated wear particles were generated at high loads by fatigue due to repeated loading and sliding.
김효상(Hyo-Sang Kim),김대현(Dae-Hyun Kim),안효석(Hyo-Sok Ahn),한준희(Junhee Hahn),이우(Lee Woo) 한국트라이볼로지학회 2010 한국윤활학회지(윤활학회지) Vol.26 No.1
Tribological properties of nanoporous structured alumina film was investigated. Alumina film (AAO: anodic aluminum oxide) of 60 μm thickness having nanopores of 45 nm diameter with 105 nm interpore-diatance was fabricated by mild anodization process. Reciprocating ball-on-flat sliding friction tests using 1 mm diameter steel ball as a counterpart were carried out with wide range of normal load from 1 mN to 1 N in an ambient environment. The morphology of worn surfaces were analyzed using scanning electron microscopy. The friction coefficient was strongly influenced by the applied normal load. Smooth layer patches were formed on the worn surface of both AAO and steel ball at relatively high load (100 mN and 1 N) due to tribochemical reaction and compaction of wear debris. These tribolayers contributed to the lower friction at high loads. Extremely thin layer patches, due to mild plastic deformation of surface layer, were sparsely distributed on the worn surface of AAO at low loads (1 mN and 10 mN) without the evidence of tribochemical reaction. Delaminated wear particles were generated at high loads by fatigue due to repeated loading and sliding.
김효상(Kim. Hyo-Sang),정동근(Jung. Dong-Keun),이광우(Lee. Kwang-Woo) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.11_2
At present car Voltage Regulators(DC28V100A) used in Korean armored car and bulldozer are assembled from the drawing used in America.<br/> Recently for years, Korean armored car Voltage Regulators returned<br/> from field were disassembled and analyzed,with the result that there were a lot of poor quality goods in the assembling part of Relay Assembly. In this research by analyzing the circuit drawing of Voltage Regulator, I want to remove the cause of poor quality goods and develop goods reducing cost.<br/>
김효상(Hyo-Sang Kim) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.11_1
In this paper, we proposed the efficient fuzzy logic controller for single intersection which control the period of the traffic light according to the traffic load. In this algorithm, we defined two input linguistic variables (traffic load, the period of the green light) and inferenced the extension period of green light using by various fuzzy control rules. Because of considering both traffic load and present period of green light, the proposed algorithm has a dynamic adaptability for traffic load. using by various type of input traffic load function, the performance of proposed algorithm are estimated. From the computer simulation, we proved the proposed method tas a good adaptatility.<br/>
새로운 고주파 점화장치를 이용한 착화성 향상에 관한 연구
김효상(Hyo-Sang Kim) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_1
For fuel economy and pollutant reduction, the interests in lean burn has increased recently. The purpose of this research is to develop a new High Frequency Ignition System(NHIS) that can make powerful ignition. We studied relations between performance of NHIS and probability of inflammation under various ignition conditions. It is concluded that the portion of capacitance energy to the total energy is comparatively larger and that the optimum spark interval and spark duration are dependent upon conditions of Constant Volume Combustion Chamber.<br/>