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이성준,Lee, S.J. 한국전자통신연구원 2011 전자통신동향분석 Vol.26 No.6
2011년 7월에 도로명과 건물번호를 사용하는 새로운 주소 체계인 도로명주소가 고지되었다. 본 고에서는 100년 가까이 사용한 지번주소를 대체하기 위한 도로명주소와 관련 사업 등의 추진 동향을 살펴보고, 현재 추진상에서 쟁점이 되는 사항들과 도로명주소 등의 추진에 관련된 기술적인 이슈 및 동향 등에 대해서 살펴보기로 한다. 이를 위해서 기존 주소의 문제점 개선과 국제적인 표준 동향에 따르기 위한 도로명주소의 추진 상황과 국가의 기관별로 구역설정을 공통으로 활용하기 위한 구역번호의 추진 상황을 살펴본다. 도로명주소 추진 상황을 더욱 이해하는 차원에서 최근에 제기되고 있는 건물 단위의 행정구역과의 불일치 문제, 도로명의 표기 문제, 동과 공동주택 명칭 사용 제외 등에 대한 쟁점사항을 소개한다. 그리고 도로명주소와 관련된 기술적 이슈 및 동향들을 GIS 기술과의 결합, 데이터 정제 기술, 상세 주소의 정형화를 통한 데이터 호환, 정보시스템의 구현 및 연계 기술, 국제 표준화를 위한 대응, 우편물류 분야 측면에서 각각 살펴본다.
유지은,이성준,Yu, J.E.,Lee, S.J. 한국전자통신연구원 2022 전자통신동향분석 Vol.37 No.3
The Korean mobile service market has persistently grown with the number of subscribers and volume of mobile traffic. It shows the slow diffusion of 5G subscribers, and rapid growth of both the MVNO(Mobile Virtual Network Operator) market and unlocked mobile phones. Therefore, this study derives the direction of telcos' strategies and policy implications by empirically analyzing the usage and attitude of LTE and 5G subscribers. Our major findings are as follows: First, our current mobile service subscription market constitutes most long-term customers for their incumbent carriers only by device change from lock-in with bundle services. Mobile tariffs, data speed, and benefits of bundle services are important factors affecting choices and customers' satisfaction with a provider and intentions of churning to another. Second, demand and satisfaction for using 5G are less because speeds and service tariffs act as pain points for 5G services. Third, the users' high preferences for MVNOs and unlocked mobile phones are linked to their subscription to MVNOs' low-cost plans with unlocked mobile phones on online channels. These streams lead to a big change in the market competition that MNO(Mobile Network Operator)s' market shares are expected to decrease and MVNOs' shares will be increased by two times, in the near future. Therefore, MNOs need to change their distribution strategies from offline to online channels and try to resolve the stereotype, "mobile tariffs are expensive," by enhancing their service values. Finally, as consumers prefer one-stop service in the same channel regardless of the distribution channel, policies should focus on the consumers' needs for convenience rather than on the channel separation for perfectly unlocked mobile phones.
최재호(J. H. Choi),이진수(J. S. Lee),조현준(H. J. Cho),이성준(S. J. Lee),전승배(S. B. Chen),차봉준(B. J. Cha) 한국유체기계학회 2008 유체기계 연구개발 발표회 논문집 Vol.2008 No.-
This paper presents an aerodynamic design, flow analysis and performance test of a transonic centrifugal compressor for APU applications. The compressor is made up of a centrifugal impeller, a wedge diffuser and a des wirier. The impeller and diffuser for this kind of application should be developed to meet air-bleeding requirement and shaft power extraction requirements, that is, very wide operational range. Aerodynamic design for this purpose is performed and three-dimensional numerical analysis with Reynolds-averaged Navier-Stokes solver is performed to analyze the flows in the impeller, diffuser and deswirler considering the impeller tip clearance. Test module and Jig facilities for the compressor stage performance test are developed. The overall compressor stage performances measured at the test Jig are compared with aerodynamic design results.
위장관 39 : 대장의 용종 및 암조직에서 cyclooxygenase - 1 ( COX - 1 ) 과 - 2 ( COX - 2 ) 의 발현
이구(G . Lee),전훈재(H . J . Chun),진윤태(Y . T . Jeen),이성준(S . J . Lee),김광희(K . H. Kim),권오상(O . S . Kwon),이홍식(H . S . Lee),송치욱(C . W . Song),엄순호(S . H . Um),이상우(S . W . Lee),최재현(J . H . Choi),김창덕(C . D . Kim 대한소화기학회 1998 대한소화기학회 추계학술대회 Vol.1998 No.-
알루미늄 판재의 전기저항가열 압출점접합공정에 있어서 접합강도에 관한 연구
이성준(S. J. Lee),이문용(M. Y. Lee),진인태(I. T. Zin) 한국소성가공학회 2012 한국소성가공학회 학술대회 논문집 Vol.2012 No.10
It was studied that two plates of aluminum can be welded by extru-riveting experiments by electric resistance heated method, and that the welding strength and metal flow on the welding section were analyzed by computer simulation according to the welding variable such as the welding current and welding time. And it was known heat distribution is calculated using a DEFORM-3D software. It was known by computer simulation that welding strength on the welding section of plates could be influenced by the the welding current and time, and that welding strength is the highest when welding current is 37㎄ and welding time is 90cycle, when aluminum 5052 two plates with 1㎜ thickness and one plate with 2㎜ thickness for inserting rivet plate are used in extru-riveting spot welding process.