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무급유 포일 베어링으로 지지되는 터보 블로워의 공력 불안정성이 회전체 및 내구성에 미치는 영향
이희섭(Heesub Lee),정진택(Jintaek Chung),이용복(Youngbok Lee) 한국트라이볼로지학회 2007 한국트라이볼로지학회 학술대회 Vol.2007 No.11
Fuel cell turbo-blower supported by oil-free foil bearings which remove oil-contamination by elimination of the conventional ball bearing and oil lubrication systems is presented. The mixed type turbo-blower makes one stage air compression with vaneless-diffuser at operating speed, 30,000rpm. In this study, the rotordynamic and durability effects caused by aerodynamic instability were investigated with variable mass flow rate. Correlation between frequencies of pressure fluctuation in vaneless-diffuser and those of excitation forces on rotor were clearly developed in aerodynamic unsteady region. In order to confirm the durability of oil-free foil bearing, top foil was observed using measuring apparatuses. Thus these results show that it is beneficial to design high speed rotating turbomachinery considering coupling effect between aerodynamic instability and rotordynamic force, durability.
상품시장에서의 경쟁이 기업의 부동산 보유에 미치는 영향과 기업가치 관련성
이지혜 ( Lee Jihye ),변희섭 ( Byun Heesub ) 한국부동산분석학회 2016 不動産學硏究 Vol.22 No.3
This paper applies corporate finance theory to an empirical analysis of the effect of product market competition on corporate real estate and its market valuation. First, as the level of product market competition increases, the ratio of corporate real estate (esp. direct ownership) to other assets increases. This implies that firms regard real estate as a way to get a competitive edge or as a method of storing value. Second, increases in corporate real estate assets are associated with decreases in firm value, as previous studies have found, but this relationship is weaker in more-competitive industries and more pronounced in less-competitive environments. This suggests that competitive threats motivate firms to properly use their real estate assets. When classifying corporate real estate into two categories, direct ownership and real estate investment, the negative relationship between the ratio of corporate real estate assets on the balance sheet and firm value is less pronounced in more-competitive product markets but the negative relationship is comparatively stronger in less competitive product markets. In summary, competitive threats can motivate firms to store up value in real estate, but management must wisely use these assets in order to have a positive impact on firm value.
시뮬레이션을 이용한 뒷좌석 여성 탑승자 상해 감소를 위한 로드리미터와 프리텐셔너 최적화 연구
심희섭(Heesub Sim),윤영한(Younghan Youn),손완윤(W. Y. Son),이승상(S. S. Lee),박지양(J. Y. Park),김혜선(H. S. Kim),송영준(Y. J. Song) 한국자동차공학회 2013 한국자동차공학회 학술대회 및 전시회 Vol.2013 No.11
The restraint systems on the front seats of automobiles have been continuously improved in recent years. Thus, the front seats consist of a safety belt with a pretensioner and load limiter to decrease rear passenger"s injuries on frontal crash. In rear seats, however, there is a lack of restraint systems as a pretensioner and load limiter as well as rear seat occupant"s injury is higher than the front seat occupant"s according to the study result for safety. In this study, the load-limiter and pretensioner were modeled to to improve injury severity for rear seat female occupant using the simulation techniques. The design parameters were chosen a pretensioner and load limiter : Load limiter force, pretensioner TTF(Time to Fire), pretensioner inlet. Then, the design variables were optimized using the design of experiment method and Injury assessment method used joint probability of injury in USNCAP. This study investigated the correlation between joint probability of injury and the design variables and minimized injury criteria through various method and the design of restraint systems.
Design of an Archiving System Architecture for Large Science Data
Jongtae Lim,Indeok Seo,Heesub Song,Seunghun Yoo,Jaeyun Jeong,Jungkwon Cho,Aniruddha Paul,Geonsik Ko,Byounghoon Kim,Yunjeong Park,Jinwoo Song,Seohee Lee,Hyeonwook Jeon,Minwoong Choi,Yeonwoo Noh,Dojin C 한국콘텐츠학회 2016 한국콘텐츠학회 ICCC 논문집 Vol.2016 No.12
남희섭,이은우(Nam Heesub,Lee Eunwoo) 한국정보법학회 2012 한국정보법학회 정기세미나 발표자료 Vol.- No.10
2011. 7. 1.자로 잠정 발효1)된 「대한민국과 유럽연합 및 그 회원국 간의 자유무역협정」(이하 ‘한-EU FTA’라 함) 제10.66조 제1항은 온라인서비스제공자(이하 ‘OSP’라 함)에게 소위“일반적 감시 의무”를 부과하지 못하도록 하고 있다. 그런데 FTA 이행을 위해 개정된 저작권법2)에는 이 조항을 그대로 반영한 조문이 없다.
뒷좌석 승객 충돌안전성 향상을 위한 안전띠 부착장치 최적위치 연구
손완윤(Wanyun Son),윤영한(Younghan Youn),심희섭(Heesub Shim),이승상(Seungsang Lee),박지양(Jiyang Park),김혜선(Hyusun Kim),송영준(Youngjun Song) 한국자동차공학회 2013 한국자동차공학회 학술대회 및 전시회 Vol.2013 No.11
To enhance passengers safety in the event of a car accident, the researches of the vehicle crashworthiness have been constantly conducted. The protection of frontal seat passengers in both driver and front seated occupant has been more focused from the auto industries as well as regulatory bodies more than 40 years. Recently, their interests have been extended to rear seat occupants especially children and female occupants. However, the current available safety devices for the rear seat occupants are seat belt only. According to the previous researchers, the injury level of the rear seat passengers tend to be higher than the injury level of the frontal seat passengers. In this study, the optimal location of seat belts anchorages to enhance rear passengers crashworthiness are studied. FEM models are designed in accordance with regulation of KMVSS 102, ECE R44, ECE R16, and ECE R14. and three point belts are fitted on the HybridIII 5<SUP>th</SUP> percentile dummy and HybridIII 50<SUP>th</SUP> percentile dummy. The combined injury value used HIC15, Nij, Chest deflection, Femur force are used to evaluate the optimal location.
Hyosang Kwon,Wonjong Yang,Sangyong Park,Heesub Lee,Jong Keun Kim,Jun Hyun Han 대한요로생식기감염학회 2023 Urogenital Tract Infection Vol.18 No.2
Purpose: This study examined the epidemiological trends of bladder-related urological procedures in South Korea from 2009 to 2021. Materials and Methods: The data were obtained from the Health Insurance Review and Assessment Service (HIRA) database, encompassing various bladder-related urological procedures. The frequencies and trends were analyzed using statistical methods. Results: Uroflowmetry, cystoscopy, prostate biopsy, and urethral dilation showed a positive trend, while prostate massage exhibited a negative trend. The 72-hour voiding function test, which started in 2017, also demonstrated a positive trend in frequency. A urodynamic study and mid-urethral sling operation exhibited an overall decreasing trend. Bladder-indwelling catheter, Nelaton catheterization, and cystostomy catheter change showed increasing trends, while suprapubic cystostomy showed a decreasing trend. Conclusions: This 12-year analysis provided valuable insights into the epidemiological patterns and utilization of bladder-related urological procedures in South Korea. These trends highlight the evolving landscape of diagnostic and therapeutic approaches in bladder-related conditions and the importance of interdisciplinary collaboration between urology and other medical departments. The results highlight the need for optimizing catheter-related care protocols, resource allocation, and continued monitoring of practices across healthcare settings.