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구조해석을 통한 T/CON 피스톤 처짐량 및 피로수명에 대한 연구
임상우(Sangwoo Lim),이웅철(Woongchul Lee),권의섭(Eaisub Kwon),신순철(Sooncheol Shin),주인식(Insik Joo) 한국자동차공학회 2013 한국자동차공학회 학술대회 및 전시회 Vol.2013 No.11
Torque converter consists of fluid clutch and lock-up clutch. When the lock-up clutch activates, piston operation transfers the engine power to the transmission. In recent times, in order to meet the requirements for light weight and stability, Torque converter requires optimized design using structural analysis considering maximum load. The most effective parts to lightweight is piston of lock-up clutch which is necessary design criteria. In addition, study for life optimization was conducted. For analysis, piston shape is of single facing clutch type. In the future, this study will aid for structural design of piston.
제품-서비스 통합 비즈니스 개념 설계: 증강현실기기-헤드 마운트 디스플레이 사례연구
임상우(SangWoo Lim),최경현(Gyunghyun Choi) 한국산업경영시스템학회 2016 한국산업경영시스템학회 학술대회 Vol.2016 No.추계
Recently, Product-Service System(PSS) is a rising paradigm that enables integration between products and services offering. Also, academic interests for product-service design using the house of quality (HOQ) have been emerged. the engineering characteristics of the HOQ are usually extracted by experts. However, as the new technologies were merged, it was difficult to find the optimum expert for extracting the engineering characteristics in the fusion technology. Therefore, this paper applies the topic modeling technique using patent data to extract the engineering characteristics which considers not only products features but also services characteristics. Also, a case study demonstrates the usefulness of our approach with augmented reality-head mounted display. It was conducted to make the HOQ with distinct four steps. First, the customer needs were collected through the latest device review from website and grouped into the representative customer needs. Second, the engineering characteristics of the augmented reality-head mounted display were extracted by using the US patent data of augmented reality head mounted display through the topic modeling technique. Third, the correlation degree of product - service characteristics was drawn by using the extracted topic’s cosine similarity. Finally, the relationship matrix of customer needs and engineering characteristics was filled with experts. After which we suggest product-service business concepts from HOQ. Main advantage is appeared from the result of this research paper is that it can provide the business concepts of the integrated product-services to reflect the customer requirements. This business concepts are utilized for the early phase in R&D plannin
탄소나노재료-리튬이온전지 융합연구의 현황 분석 및 미래유망분야 도출 연구
임상우(SangWoo Lim),유종태(JongTae Yoo) 한국기술혁신학회 2018 한국기술혁신학회 학술대회 발표논문집 Vol.2018 No.11
1991년 Sony 社의 리튬이온전지 등장 이후, 빠르게 변화하는 기술 환경은 고용량, 고효율성, 안전성 등 성능이 대폭 향상된 리튬이온전지의 시장 수요를 지속적으로 증가시켜왔다. 이러한 수요 속에 탄소나노재료와 리튬이온전지의 융합 연구는 기존의 한계점을 극복하고 관련 산업의 패러다임을 변화시킬 혁신적인 기술로 많은 연구자들에 의해 주목받고 있다. 이에 본 연구에서는 2가지 단계를 통해 리튬이온전지와 탄소나노재료의 융합 기술에 대한 동향을 분석하였다. Phase 1로 탄소나노재료-리튬이온전지 융합기술의 사례분석을 수행하였다. Phase 2로 LDA 알고리즘을 활용하여 탄소나노재료-리튬이온전지 산업의 기술 동향을 분석하였다. 이러한 연구 결과는 이차전지분야의 연구방향 설정 및 민·관의 R&D 투자방향 수립에 큰 도움을 줄 것으로 기대된다. Of various rechargeable energy storage systems reported to date, lithium-ion batteries (LIBs) have occupied a predominant position from the first commercialization thereof in 1991. However, the rapidly changing technology environment, including smart portable electronics, internet of things (IoTs), and electric vehicles (EVs), has driven a relentless pursuit of high-energy-density/high-safety rechargeable energy storage systems with reliable electrochemical performance. Among the vast variety of energy materials, carbon nano-materials have garnered considerable attention as a powerful tool to address the above mentioned challenges. Here, we introduce the technical analysis on current trends and future outlook for nano-battery interdisciplinary research. In the first phase, case studies for the LIBs are carried out especially focused on carbon nano-materials. Then, in the second phase, technology trends for the nano-battery interdisciplinary research were analyzed though the LDA Algorithm based on patent data. We anticipate that this study will provide a promising perception for establishing the research direction and R&D investment in the nano-battery interdisciplinary research.
RF 마그네트론 스퍼터를 이용하여 제작한 MIZO 박막의 특성에 미치는 기판 온도의 영향
전기석(Kiseok Jeon),지홍섭(Hongsub Jee),임상우(Sangwoo Lim),정채환(Chaehwan Jeong) 한국태양광발전학회 2016 Current Photovoltaic Research Vol.4 No.4
Mg and In co-doped ZnO (MIZO) thin films with transparent conducting characteristics were successfully prepared on glass substrates by RF magnetron sputtering technique. The Influence of different substrate temperature (from RT to 400℃) on the structural, morphological, electrical, and optical properties of MIZO thin films were investigated. The MIZO thin film prepared at the substrate temperature of 350℃ showed the best electrical characteristics in terms of the carrier concentration (4.24×10<SUP>20</SUP>㎝<SUP>-3</SUP>), charge carrier mobility (5.01 ㎠V<SUP>-1</SUP>S<SUP>-1</SUP>), and a minimum resistivity (1.24×10<SUP>-4</SUP>Ω·㎝). The average transmission of MIZO thin films in the visible range was over 80% and the absorption edges of MIZO thin films were very sharp. The bandgap energy of MIZO thin films becomes wider from 3.44 eV to 3.6 eV as the substrate temperature increased from RT to 350°C. However, Band gap energy of MIZO thin film was narrow at substrate temperature of 400℃.
이중 텍스쳐 구조를 적용한 선택적 에미터 태양전지의 특성 분석
김창헌(Changheon Kim),이종환(Jonghwan Lee),임상우(Sangwoo Lim),정채환(Chaehwan Jeong) 한국태양광발전학회 2014 Current Photovoltaic Research Vol.2 No.3
We have fabricated the selective emitter solar cell using double textured nanowires structure. The 40×40 mm2-sized silicon substrates were textured to form the pyramid-shaped surface and the nanowires were fabricated by metal assisted chemical etching process using Ag nanoparticles, subsequently. The heavily doped and shallow emitters for selectiv eemitter solar cells were prepared through the thermal POCl₃ diffusion and chemical etch-back process, respectively. The front and rear electrodes were prepared following conventional screen printing method and the widths of fingers have been optimized. The selective emitter solar cell using double textured nanowires structure achieved a conversion efficiency of 17.9% with improved absorption and short circuit current density.