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LPG기관의 과류밸브가 가속성능에 미치는 영향에 관한 실험적 연구
장태익,김창헌,김철수,Jang Tae-Ik,Kim Chang-Hun,Kim Chul-Soo 한국마린엔지니어링학회 2004 한국마린엔지니어링학회지 Vol.28 No.7
This paper is to investigate on the effects of the hole size of spring type EFV(excessive flow valve) for automobiles The analytical and experimental methods were employed to measure the discharge coefficient. choked flowrate and Pressure wave in a bombe, line and vaporizor The size of EFV was determined to meet the legally permitted limits with the capacity of engine displacement up to 2000cc, according to the obtained discharge coefficient. The Purpose of this paper is 1) to find causes of bad acceration performance in LPG engines 2) to find optimal design determination of spring coefficient and orifice hole size of excessive flow valve in LPG engine 3) to find pressure wave of bombe, line and vaporizer through expeimental verification. Experimental results indicated that increase of orifice size 0.5mm to 1mm be caused to increase discharge coefficient, and choked flow rate and decrease operation range of difference pressure wave.
앳킨슨사이클 실현을 위한 단기통 저속 디젤기관의 구성과 기초 실험
장태익 한국수소및신에너지학회 2013 한국수소 및 신에너지학회논문집 Vol.24 No.5
In this research, the diesel cycle was thermodynamically interpreted to evaluate the possibility of high efficiency by converting diesel engine to the atkinson cycle, and general cycle features were analyzed after comparing these two cycles. That an experimental single cylinder and a long stroke diesel-atkinson engine, of which S/B ratio was more than 3, were manufactured. After evaluating the engine through basic experiments, a diesel engine was converted into the atkinson cycle by constituent VCR (variable compression ratio) device and VVT (variable valve timing) system. The experimental method was to observe compression work reduction effects due to low compression effects from delayed intake valve closing of the early stage atkinson engine. The result, the possibility of increasing compression ratio about each engine load was confirmation by constructing compensate expansion-compression ratio in accordance with the delayed intake valve close.
저속 디젤기관에서 흡기밸브 닫힘시기 지연시 고팽창 실현을 위한 열효율 특성
장태익,Jang Tae-Ik 한국마린엔지니어링학회 2006 한국마린엔지니어링학회지 Vol.30 No.1
In this research. the diesel cycle was thermodynamically interpreted to evaluate the possibility of high efficiency by converting diesel engines to the high expansion diesel cycle, and general cycle features were analyzed after comparing these two cycles. Based on these analyses. an experimental single cylinder a long stroke with high expansion-diesel engine. of which S/B ratio was more than 3, was manufactured. After evaluating the base engine through basic experiments, a diesel engine was converted into the high expansion diesel engine by establish VCR device and VVT system Accordingly, the high expansion diesel cycle can be implemented when the quantity of intake air is compensated by supercharge and the effective compression ratio is maintained at its initial level through the reduction of the clearance volume. In this case, heat efficiency increased by $5.0\%$ at the same expansion-compression ratio when the apparent compression ratio was 20 and the fuel cut off ratio was 2. As explained above, when the atkinson cycle was used for diesel cycle, heat efficiency was improved. In order to realize high expansion through retarding the intake value closing time, the engine needs to be equipped with variable valve timing equipment, variable compression ratio equipment and supercharged pressure equipment. Then a high expansion diesel cycle engine is realized.
장-행정 저속 4 사이클 디젤기관의 제작 및 최적 연소조건에 관한 연구
장태익 한국마린엔지니어링학회 2004 한국마린엔지니어링학회지 Vol.28 No.3
Recently, fuel prices have been continually raised in diesel engine. Such a change in the fuel price influences enormously the development trend of marine diesel engines for slow speed, In other words, the focus was shifted from large diameter and high speed to low fuel consumption. Accordingly, more efforts are being made for engine manufacturing and development to develop highly efficient engines. In this study. a single cylinder 4 stroke cycle DI slow speed diesel engine was designed and manufactured, a 4 stroke cycle was configured and basic performances were evaluated. The results are as follows. The optimal fuel injection timing had the lowest value when specific fuel consumption was in BTDC 8~$10^{\circ}$, a little more delayed compared to high speed diesel engines. Cycle variation of engines showed about 5% difference at full loads. This is a significantly small value compared to the cycle variation in which stable operation is possible, showing the high stability of engine operation is good. The torque and brake thermal efficiency of engine increased with an increase of engine 250-450 rpm. but fuel consumption ratio increased from the 450 rpm zone and thermal efficiency abruptly decreased. Mechanical efficiency was maximally 70% at a 400 rpm that was lower than normal engines according to the increase of mechanical frictional loss for cross head part. The purpose of this study was to get more practical engines by comparing the above results with those of slow speed 2 stroke cycle diesel engines.
장태익,백연지,남기춘 한국인지및생물심리학회 2014 한국심리학회지 인지 및 생물 Vol.26 No.4
Reading the Korean Hanja (logographic) and Hangul (alphabetic) scripts invokes different underlying neural mechanisms based on the degree of grapheme-to-phoneme correspondence (GPC) in the two scripts. This study examined the distinct brain asymmetries in processing Hanja and Hangul scripts of the Korean language according to the Hanja proficiency levels of Korean native speakers. Twenty-five participants were divided into two groups according to their Hanja proficiency levels: High and low groups. Participants performed a lexical decision task (LDT) during the electroencephalogram (EEG) recording. Results revealed differential brain asymmetry patterns according to the participants’ Hanja proficiency levels. The high Hanja proficiency (HP) group showed a larger N400 lexicality effect in the right hemisphere, whereas the low Hanja proficiency (LP) group showed a larger N400 lexicality effect in the left hemisphere during Hanja script recognition. However, no distinct hemispheric asymmetry was observed according to Hanja proficiency levels when participants processed words written in Hangul script. These findings indicate that the processing of Korean Hanja script involves distinct neural processes distinguished from Hangul script processing, whereby different hemispheric specializations are involved according to the Hanja proficiency level of the reader.
심방 중격과 승모판 전엽 양쪽에 동시에 부착된 좌심방 점액종 1예
장태익,정재헌,박정탁,이정은,임세중,정남식,임상현 대한내과학회 2004 대한내과학회지 Vol.66 No.6
저자 등은 심계항진을 주소로 내원한 59세 여자 환자에서 심초음파에 의해 진단하여 종양 절제를 성공적으로 시행한 좌심방내 심방 중격과 승모판 전엽 양쪽에 동시에 부착된 점액종 1예를 경험하였기에 문헌고찰과 함께 보고하는 바이다. Myxoma is the most common primary cardiac tumor. It usually develops on the interatrial septum, and occurs in the left atrium in more than 75% of cases. Myxoma in the ventricle is much less common and accunts for only 5% of cases. A myxoma arising from mitral valve is exceedingly rare and is normally located on the atrial side of valve, with and eqivalent distribution between the anterior and posterior leaflets. We report a case of myxoma that arose from both the interatrial septum and anterior mital leaflet. which has not been previously reported in the literature.
장태익,박정탁,이동형,이주현,유태현,김범석,강신욱,이호영,최규헌 대한의학회 2010 Journal of Korean medical science Vol.25 No.9
We undertook this study to elucidate whether baseline peritoneal membrane transport characteristics are associated with high mortality in incident automated peritoneal dialysis (APD) patients. This retrospective study includes 117 patients who started APD at Yonsei University Health System from 1996 to 2008 and had a PET within 3 months of APD initiation. High transporters were significantly older and had a higher incidence of cardiovascular disease. Patient survival for years 1, 3, and 5 were 85%, 64%, and 35% for high transporter and 94%, 81%, and 68% for non-high transporter group (P<0.01). Multivariate analysis revealed that age, diabetes, cardiovascular disease, serum albumin level, and residual renal function were independently associated with high mortality in APD patients. In contrast, high transport status was not a significant predictor for mortality in this population when the other covariates were included. Even though high transport was significantly associated with mortality in the univariate analysis, its role seemed to be influenced by other comorbid conditions. These findings suggest that the proper management of these comorbid conditions, as well as appropriate ultrafiltration by use of APD and/or icodextrin, must be considered as protective strategies to improve survival in peritoneal dialysis patients with high transport.