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- 저자 : 김효상(Kim Hyo-Sang) (검색결과 94 건)
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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
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.
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김효상(Hyo-Sang Kim),김대현(Dae-Hyun Kim),한준희(Junhee Hahn),안효석(Hyo-Sok Ahn) 한국트라이볼로지학회 2011 한국트라이볼로지학회지 (Tribol. Lubr.) Vol.27 No.4
Friction behavior of nanoporous anodic aluminum oxide(AAO) film was investigated. A 60 μm thick AAO film having nanopores of 45 nm diameter with 105 nm interpore-diatance was fabricated by mild anodization process. The AAO film was then saturated with paraffinic oil. Reciprocating ball-on-flat sliding friction tests using 1 mm diameter steel ball as the counterpart were carried out with normal load ranging from 0.1 N to 1 N in an ambient environment. The morphology of worn surfaces were analyzed using scanning electron microscopy. The friction coefficient significantly increased with the increase of load. The boundary lubrication layer of paraffinic oil contributed to the lower friction at relatively low load (0.1 N), but it is less effective at high load (1 N). Plastic deformed layer patches were formed on the worn surface of oil-enriched AAO at relatively low load (0.1 N) without evidence of tribochemical reaction. On the other hand, thick tribolayers were formed on the worn surface of both oil-enriched a nd as-prepared AAO at relatively high load (1 N) due to tribochemical reaction and material transfer.
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김효상(Hyo-Sang Kim),김대현(Dae-Hyun Kim),안효석(Hyo-Sok Ahn),한준희(Junhee Hahn),이우(Lee Woo) 한국트라이볼로지학회 2010 한국트라이볼로지학회지 (Tribol. Lubr.) 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.
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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/>
ScienceON
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