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장성규,전언찬,김대원 동아대학교 공과대학부설 생산기술연구소 1997 生産技術硏究所硏究論文集 Vol.2 No.2
High performance ABS have been introduced in the market because car manufacturers and drives have been recongnized the important safety function of these systems. In the beginning of ABS introduction only luxury vehicles where equipped with ABS because of the high additional cost. Today there is the medium and even compact vehicle class. Therefore it became a necessity to develop an ABS which meets the requirements of manufacturers and drivers concerning performance comfort and especially cost. As a highly advanced technology and skills which include electronic, hydraulic controls, element design and manufacturing technology. ABS system has recently been entered into mass production as a result of long research and many try and errors. In this research, we tested MKⅣ-G ABS system, which was developed by ITT automotive, in various methods and got the quite good results in its function. MKⅣ-G ABS system can be extended to TCS(Traction Control System) function and is now under developing by localization in domestic. But on demand car manufactures and customers, new generation ABS system, that means simple, low cost and high function, is already under developing among advanced nations in this area. Although we are still in early stage of ABS system development, if we analyze and study the function of various ABS system through these research and put it to practical use step by step, we can develop independent ABS model in the near future.
장성규,변상기,이승수,김현수,전언찬 동아대학교 공과대학부설 생산기술연구소 1997 生産技術硏究所硏究論文集 Vol.2 No.1
Among the cutting process, recently hole processing in one of extensive using. This study, we made use of the 3 point edge drill. Regarding the cutting efficiency, we investigated the shape of cutting hole and studied cutting hole, a slope of center shaft, roundness and surface roughness. By using carbide 3 point cutting edge, compare with 2 cutting edge, it is possible that high precision drill processing and near the hole, at extremely limited area, quantity of magnification is a little big. After 15m cutting distance, a gradient of center shaft values was fixed 22㎛. It is necessary that a sufficient consideration concerned with jig intensity of workpiece, cutting conditions etc.
위치결정 스테이지의 정밀위치결정을 위한 가상모드 입력성형기 응용에 관한 연구
장준원,박상원,서용규,홍성욱 한국공작기계학회 2008 한국공작기계학회 춘계학술대회논문집 Vol.2008 No.-
This paper deals with precise positioning of positioning stage by input shaping, Input shaping is well known to be a very effective tool for suppressing the residual vibration of flexible structures. However, the input shaping tends to increase the rise time of the system. This problem often degrades the performance of system, In order to improve this problem, this paper proposes an input shaping method using the virtual mode concept for positioning stage. The virtual-mode input shaper is proved effective through experiments.
Pb의 노출에 따른 넙치, Paralichthys olivaceus, 치어의 생존, 성장 및 산소소비율의 변화
김성길,김재원,장석우,김상규,강주찬 한국어병학회 2002 한국어병학회지 Vol.15 No.3
Experiments were carried out to investigate the effects of lead exposure on survival, growth and oxygen consumption of juvenile oliver flounder, Paralichthys olivaceus. Survival rate of the oliver flounder was significantly affected above 150㎍/L. Growth of the olive flounder exposed to ≥ 150 ㎍/L of lead concentration was significantly lower than that of fish reared in normal condition. Metabolic rate of fish exposed to lead ≥ 80 ㎍/L concentration was significantly reduced with increasing lead concentration than that in normal condition. This study revealed that high lead concentration (≥ 80 ㎍/L) reduced growth and metabolic rates of juvenile olive flounder suggesting potential influence of lead on the natural mortality of olive flounder in the coastal areas.
변상기,장성규,이충엽,전언찬 동아대학교 공과대학부설 생산기술연구소 1997 生産技術硏究所硏究論文集 Vol.2 No.2
Cuttingability of carbide step drill is highly progressing the step drill with more then twice diameter rate is so difficult in regrinding and very easy to damage during machining. As the machining of step drill for blind hole is occur to breakage at small diameter position, so it is very difficult to machining. In this experiments, we investigate roundness and surface roughness by machining distance and were identified that the first distance, 5∼10m, was fine with 7㎛ but the around of 15m was happened so much alternation. And we were identified that after 20m was happend stable machining. The surface roughness was happened the same conditions. So application of step drill, we think that the selection of cutting conditions need lots consideration and the study of step drill's diameter ratio is carried out.
김영수,박진식,장성호,장부규,서정민,김장호 동아대학교 환경문제연구소 1996 硏究報告 Vol.19 No.2
This study was carried out to investigate the performance enhancement of forced oxidation operation on the limestone utilization and SO₂ removal efficiency of the pilot flue gas desulfurization system. The results are as follows : 1. The results of the forced oxidation tests have shown that converting from natural to forced oxidation operation can have a significant effect on both limestone utilization and SO₂ removal efficiency of an FGD system. Conversely, if the limestone utilization is maintained at a constant level, the SO₂ removal efficiency will increase. Conversely, if the pH is held constant, the limestone utilization will increase significantly. 2. This characteristic of a forced oxidation system can translate into lower L/G requirements and, therefore, reduced capital and operating costs for slurry recycle pumps. 3. Forced oxidation operation will provide improved limestone utilization and, therefore. reduced limestone reagent costs.
싱글 튜브 시스템 BTA 工具를 使用한 SM55C 鋼의 深孔 加工 特性에 관한 硏究
全泰玉,全彦燦,沈成輔,張性圭 동아대학교 공과대학 부설 한국자원개발연구소 1994 硏究報告 Vol.18 No.2
The BTA deep hole machining has an increasing demand because of its wide applications and its good productivity. The main feature of the BTA drill is that the tool cutting edges are unsymmetrically located on the boring head. This provides a stabilizing cutting force resultant necessary for self guidance of the boring head. The BTA drills are capable of machining for having large length to diameter ratio in single pass. The study of the accuracy and surface finish of holes produced would reveal quite useful information regarding the process. This thesis deals with the experimental results obtained during single tube system BTA machining on SM55C steel for different machining conditions.
원발성 두개골내 수막종 : 1예 보고 A Case Report
김대호,홍현숙,조준희,박재성,박성진,차장규,백상현,이혜경 순천향의학연구소 2004 Journal of Soonchunhyang Medical Science Vol.10 No.2
Primary intraosseous meningioma of skull is rare, and often confused with a primary bone tumor. We report a case of a 71 years old female patient with an intraosseous calvarial meningioma of frontal bone presenting as a solitary osteolytic skull lesion. Plain skull radiograph, CT and MR images show sharply marginated expansile bony lesion in frontal skull vault, and a small well enhanced soft tissue mass within bone. The mass is extracranially protruded to scalp, and is partially attached to the underlying dura. Outer and inner table of skull vault is slightly bulged out, suggesting intradiploic origin of the tumor. The tumor was treated with surgical excision and cranioplasty. Histological examination revealed fibrous meningioma.
홍현숙,김대호,이혜경,박재성,박성진,조준희,차장규,백상현 순천향의학연구소 2004 Journal of Soonchunhyang Medical Science Vol.10 No.2
We report seizure induced brain swelling in three patients. MRI revealed a cortical, subcortical(3/3), and basal ganglia(2/3) high signal intensity on T2- weighted and FLAIR images. The lesion shows low signal on T1-weighted image, and enhanced after contrast administration. Follow up study after 27 days in one case revealed complete resolution of the lesion. The reversible MRI findings may be the results of a local brain swelling, breakdown of blood-brain permeability, and a defect of cerebral autoregulation during seizure activity. The transient nature of such findings have to be considered in the differential diagnosis such as reversible ischemia, migraine, inflammation and infection.