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포스터 전시회 : 분사압력 변화에 따른 디젤-DME연료의 다단분사 특성에 관한연구
정연호 ( Yun Ho Jeong ),양지웅 ( Ji Woong Yang ),오충환 ( Chung Hwan Oh ),임옥택 ( Ock Taeck Lim ),정수진 ( Soo Jin Jeong ),오세두 ( Se Doo Oh ) 한국액체미립화학회 2013 한국액체미립화학회 학술강연회 논문집 Vol.2013 No.-
An investigation on spray characteristics of fuels which diesel and di-methyl ether(DME) with change of injection pressure used the multi-injection in constant volume combustion chamber(CVCC). Diesel was already used famous fuel which we could use. DME showed similar features with diesel like as cetane number, auto-ignition temperature. High cetane number of diesel and DME could make possible to compression ignition. DME showed different atomization from diesel due to evaporating pressures and boiling points. Experiments were carried out in CVCC equipped with Delphi solenoid 6-hole type injector and the spray characteristics of diesel and DME were tested the various pre and pilot injection. Terms of injections and a number of injections in multi-injection has been controlled. Experiments were performed in 2 types that 1500rpm , 2000rpm and under the condition of injection ranging from 100bar to 500bar. From the results of this experiment diesel showed longer spray penetration than DME. That result showed different of atomization speed DME and diesel. Result of high injection pressure condition showed similar spray characteristics diesel and DME. After this investigation, possibilities of the using the DME in fuel business would be expected.
( Jung Taeck Hong ),( Kyung Rim Sung ),( Jung Woo Cho ),( Sung Cheol Yun ),( Sung Yong Kang ),( Michael S. Kook ) 대한안과학회 2012 Korean Journal of Ophthalmology Vol.26 No.1
Purpose: To evaluate the effect of the scanning laser ophthalmoscope (SLO) guided re-test mode on short- and long-term measurement variability of peripapillary retinal nerve fiber layer (RNFL) thickness obtained by spectral domain-SLO optical coherence tomography (SD-SLO/OCT). Methods: Seventy five healthy eyes were scanned 3 times per day (intra-session variability) by both the SLO guided re-test mode and the independent mode of SD-SLO/OCT. Subjects were scanned 3 times by both modes at visits within a 2-week interval (inter-session variability). For testing longitudinal variability, 3 separate exams were performed over 6 months by both modes. The coefficient of variation (CV), reproducibility coefficient (RC) and intraclass correlation coefficient of RNFL thickness were compared between the two modes. Results: The intra-session RC and CV ranged from 5.4 to 12.9 microns and 1.76% to 5.72% when measured by independent mode and 5.4 to 12.5 microns and 1.75% to 5.58% by re-test mode, respectively. The inter-session RC and CV ranged from 5.8 to 13.3 microns and 1.89% to 5.78% by independent mode and 5.8 to 12.7 microns and 1.90% to 5.54% by re-test mode, respectively. Intra-session and inter-session variability measurements were not significantly different between the two modes. The longitudinal RC and CV ranged from 8.5 to 19.2 microns and 2.79% to 7.08% by independent mode and 7.5 to 14.4 microns and 2.33% to 6.22% by retest mode, respectively. Longitudinal measurement variability was significantly lower when measured by the re-test mode compared to the independent mode (average, p = 0.011). Conclusions: The SLO guided re-test mode for RNFL thickness measurement in SD-SLO/OCT employing a tracking system improved long-term reproducibility by reducing variability induced by inconsistent scan circle placement.
En-Route Trajectory calculation using Flight Plan Information for Effective Air Traffic Management
Kim, Yong-Kyun,Jo, Yun-Hyun,Yun, Jin-Won,Oh, Taeck-Keun,Roh, Hee-Chang,Choi, Sang-Bang,Park, Hyo-Dal Korea Information Processing Society 2010 Journal of information processing systems Vol.6 No.3
Trajectory modeling is foundational for 4D-Route modeling, conflict detection and air traffic flow management. This paper proposes a novel algorithm based Vincenty's fomulas for trajectory calculation, combined with the Dijkstra algorithm and Vincenty's formulas. Using flight plan simulations our experimental results show that our method of En-route trajectory calculation exhibits much improved performance in accuracy.
Cross-hole Type 밀링용 비 연삭 인서트의 가공성능평가
박휘근(Hwi-Keun Park),김택수(Taeck-Su Kim),이상민(Sang-Min Lee),이원석(Won-Suk Lee),최윤서(Yun-Seo Choi),이종찬(Jong-Chan Lee) 한국기계가공학회 2011 한국기계가공학회지 Vol.10 No.2
The existent cutting insert have occupied most product of grinding style, because it has a problem of accuracy and manufacturing process. The product has a concept but development is difficult, because grinding and manufacturing by press are impossible. But by development and stabilization of a technology, preference of non-ground insert increases gradually. And then insert that grinding is impossible is developed availably as non-ground product by using developed equipment and software. In this paper reports some experimental results on the machining performance of non-ground Cutting inserts. Three kinds of Cutting inserts were manufactured without using grinding process. Machining experiments were carried out to compare the machining performance of non-ground inserts with that of ground ones. The experimental results indicate that the cutting forces and tool wear and surface roughnesses of machined surface of both ground and non-ground inserts are comparable.