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드릴공구의 이종질화막상 DLC 희생층 적용을 통한 공구 수명 개선 연구
강용진(Yong-Jin Kang),김도현(Do Hyun Kim),장영준(Young-Jun Jang),김종국(Jongkuk Kim) 한국표면공학회 2020 한국표면공학회지 Vol.53 No.6
Non-ferrous metals, widely used in the mechanical industry, are difficult to machine, particularly by drilling and tapping. Since non-ferrous metals have a strong tendency to adhere to the cutting tool, the tool life is greatly deteriorated. Diamond-like carbon (DLC) is one of the promising candidates to improve the performance and life of cutting tool due to their low frictional property. In this study, a sacrificial DLC layer is applied on the hard nitride coated drill tool to improve the durability. The DLC coatings are fabricated by controlling the acceleration voltage of the linear ion source in the range of 0.6∼1.8 kV. As a result, the optimized hardness(20 GPa) and wear resistance(1.4 x 10<SUP>-8</SUP> ㎣/N⋅m) were obtained at the 1.4 kV. Then, the optimized DLC coating is applied as an sacrificial layer on the hard nitride coating to evaluate the performance and life of cutting tool. The Vickers hardness of the composite coatings were similar to those of the nitride coatings (AlCrN, AlTiSiN), but the friction coefficients were significantly reduced to 0.13 compared to 0.63 of nitride coatings. The drilling test were performed on S55C plate using a drilling machine at rotation speed of 2,500 rpm and penetration rate of 0.25 m/rev. The result showed that the wear width of the composite coated drills were 200 % lower than those of the AlCrN, AlTiSiN coated drills. In addition, the cutting forces of the composite coated drills were 13 and 15 % lower than that of AlCrN, AlTiSiN coated drills, respectively, as it reduced the aluminum clogging. Finally, the application of the DLC sacrificial layer prevents initial chipping through its low friction property and improves drilling quality with efficient chip removal.
강용진 ( Yong Jin Kang ) 대한정치학회 2009 大韓政治學會報 Vol.16 No.2
2008년 촛불집회에서 한국정치에 새로운 양상이 나타나고 있다. 건강 등 ``삶정치(biopolitics)``가 이슈가 되고 있고, 청소년과 여성의 정치참여가 활발해졌다. 발달된 통신기술로 대중의 ``집단지성``이 조직되고 시민의 직접행동이 나타났다는 점에서 주목되고 있다. 세계화되어 가는 한국정치는 민주주의의 성숙을 요구하고 있고, 대의기구의 능력을 높여야 하는 과제를 던지고 있다. 인터넷정치의 장점을 살리는 시민교육이 요청되고 있고, 거버넌스(governance) 등 정책결정의 대표성과 책임성을 제고하는 장치가 필요함을 교훈으로 남기고 있다.
지연 추정 LMS 적응 알고리즘을 이용한 무선 중계간섭 제거기
강용진(Yong-Jin Kang),송주태(Joo-Tae Song),전익태(Ig-Tae Jeon),김주완(Joo-Wan Kim),하성희(Sung-Hee Ha),반지훈(Ji-Hun Van),이종현(Jong-Hyun Lee) 대한전자공학회 2007 대한전자공학회 학술대회 Vol.2007 No.7
The operation of interference cancellation algorithm for wireless repeater cancellation depends on either existing correlation properties between desired signal and reference signal or not. At the time, due to the correlation properties at the ICS system, adaptive algorithms without considering system delay do not function properly. Thus, this system should be oscillated. In this paper, to solve these problems, we use the delayed least mean square algorithm. For the best performance of ICS, the system delays must be estimated. To efficiently estimate the delay of ICS, we use relations between bandwidth and correlation properties of the received signal.
강용진(Kang Yong Jin) 21세기정치학회 2006 21세기 정치학회보 Vol.16 No.1
An extensive literature argues that the state has a dominant power for rule-making of economic transactions in Korea. There is an unusual case in contrast with the existing findings. The society leads the state by initiating the formulation of new rules in housing market. This study inquires political process regarding the disclosure of apartment construction cost in public sector. The factors which contributed to politicization of a specific economic issue are as follows: multiple illiteracy and mob psychology, ice braking by local government and success of agenda-setting, campaign strategy of “triangulation” by major political parties, and fragmentation of ruling party. The study suggests an implication that nationally contagious communitarian sentiment has power in revising economic norms. In the process of conflict management, Korean political parties have experienced a new type of complex politics standing in with public opinion contrary to their ideological colors. When government competes with business in housing market, the collaborative relation between them can be transformed into the tense relation. This new type of relation, which might be germinated by the growth of social forces, is metaphorically described as the wheel model rather than the locomotive model of developmental state.
강용진(Yongjin Kang),Yutaka Kidawara(Yutaka Kidawara),권용진(Yong-Jin Kwon),Katusmi Tanaka(Katusmi Tanaka) 한국정보과학회 2005 한국정보과학회 학술발표논문집 Vol.32 No.1
인터넷 기술의 발전과 웹 사용자의 증가로 웹에는 매우 많은 정보들이 축적되고 있으며, 여기에는 또한 매우 많은 지역정보가 존재한다. 일반적으로 웹 정보라고 하는 것은 웹의 컨텐츠, 사용이력, 구조를 중심으로 한 정보이며, 이러한 정보를 하나의 중요한 공간 정보원으로 취급하여 웹으로부터 특정 지역에 관한 컨텐츠를 수집하고 이를 분석하여 사용자의 공간 정보원으로서 사용할 수 있다. 또한 인터넷, 무선통신, 지리정보시스템(GIS), 위치기반서비스(LBS) 등의 기술들이 모바일기기에 복합적으로 접목되면서 모바일기기에서의 새로운 형태의 정보에 대한 응용이 요구되고 있다. 본 논문에서는 이러한 웹 환경을 활용하고, 모바일 환경을 고려하여 GIS와 Web을 통합한 모바일 지역정보 검색 시스템을 제안한다.