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- 저자 : ( Shunsuke Yamada ) (검색결과 2 건)
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( Shunsuke Gotoh ),( Tatsuya Kuboyama ),( Yasuo Moriyoshi ),( Koichi Hatamura ),( Junichi Takanashi ),( Toshio Yamada ) 한국액체미립화학회 2010 한국액체미립화학회 학술강연회 논문집 Vol.2010 No.-
The objective of this research is to extend the HCCI operational range by using direct fuel injection system and also our original blowdown supercharge (BDSC) system. The effect of in-cylinder fuel distribution on HCCI operational range was numerically and experimentally investigated. Firstly, a numerical simulation using a multi zone reaction model was carried out. The results showed that a uniform fuel distribution decreases the pressure rise rate (dP/dθ) with the thermal distribution generated by the BDSC system. Next, experiments were carried out using a gasoline engine equipped with the direct fuel injection and BDSC systems. The fuel injection timing, the fuel mass ratio between the direct injection and the port injection was varied as an experimental parameter to investigate the effect of the fuel distribution on the high load HCCI operational limits. The experimental results showed that the HCCI operational robustness at the high load operation was successfully improved by using the direct fuel injection. However, high load HCCI operational limit was hardly extended. Next, by using the endothermic effect of fuel, enhancement of thermal stratification was tested. However, the relationship between CA50 and dP/dθmax was not improved.
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( Shuntaro Nejima ),( Ken Kumagai ),( Shunsuke Yamada ),( Masaichi Sotozawa ),( Yutaka Inaba ) 대한슬관절학회 2023 대한슬관절학회지 Vol.35 No.-
Background To evaluate the expected postoperative total leg length change using preoperative radiographs during surgical planning of four different methods of double level osteotomy (DLO). Methods This study included 34 patients (44 knees) who underwent DLO for varus knee osteoarthritis. Surgical planning was performed so that the postoperative weight bearing line ratio was 62.5%. In DLO, lateral closed or medial open wedge distal femoral osteotomy (LCWDFO, MOWDFO) was performed so that the postoperative mechanical lateral distal femoral angle was 85°, and residual deformity was corrected with medial open or lateral closed wedge high tibial osteotomy (MOWHTO, LCWHTO). Pre- and surgical planning X-rays in the one-leg standing position were compared to assess the change in leg length, and the factors affecting it, in the various surgical groups. The proportion of cases in which Δ total leg length was greater than 6 mm (symptomatic change) was investigated. Results The mean postoperative total leg length increased significantly with LCWDFO + MOWHTO, MOWDFO + MOWHTO, and MOWDFO + LCWHTO, while it decreased with LCWDFO + LCWHTO. The proportion of cases with a postoperative total leg length change > 6 mm was 72.7%, 2.3%, 100%, and 6.8% in LCWDFO + MOWHTO, LCWDFO + LCWHTO, MOWDFO + MOWHTO, and MOWDFO + LCWHTO, respectively. In addition, the preoperative hip-knee-ankle angle correlated negatively with the postoperative total leg length change in LCWDFO + MOWHTO, MOWDFO + MOWHTO, and MOWDFO + LCWHTO, but not in LCWDFO + LCWHTO. Conclusions MOWDFO + MOWHTO had the largest postoperative leg length change and MOWDFO + LCWHTO had the smallest. Symptomatic leg length change (> 6 mm) should be considered in MOWDFO + MOWHTO and LCWDFO + MOWHTO.
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