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정윤교(Yoon-Gyo Jung),정혜라(Hye Ra Jung),김일만(Ealmaan Kim) 대한두개저학회 2013 대한두개저학회지 Vol.8 No.2
Osteomas mainly affect the frontal and ethmoid sinuses, and are usually asymptomatic. When enlarged, they can give rise to intracranial manifestations and life-threatening complications. A 41-year-old man presented with severe headache and drowsy mentality after blowing his nose. Computed tomography showed air bubbles in the cisterns and the ventricle and around the osteoma in the frontal sinus, suggesting that the mass was associated with entry of the air into the cranial cavity. Through a frontal sinusotomy, the cauliflower-like osteoma was found to be protruding intracranially through the frontal base and the overlying meninges. By using skull base technique, the osteoma was resected radically and the dural defect was repaired with autografts. This rare condition should be urgently treated in the event of acute deterioration. The literature will be reviewed regarding the management of cranial base osteomas and their complications.
스크류유량계 개발에 있어서의 역공학 및 성능평가에 관한 연구
김종윤(Jong-Yoon Kim),황종대(Jong-Dae Hwang),이상열(Sang-Ryul Lee),정윤교(Yoon-Gyo Jung) 한국생산제조학회 2005 한국생산제조시스템학회 학술발표대회 논문집 Vol.2005 No.5
This research presents a modeling and a manufacturing method of screw type flow meter. This paper introduces the efficient design and manufacturing method of screw type flow meter using reverse engineering and test technology. The methods introduced this paper utilize the reverse engineering that is increasing accuracy of modeling and manufacturing of reverse model. And then it can be used in performance test with hydraulic test equipment. Hence this can be used in the basic document for development of the quite accurate flow meter.
시바다 이사오(Isao Shibata),정윤교(Yoon Gyo Jung),정종윤(Jong-Yun Jung),문병준(Byung-Joon Moon) 한국산업경영시스템학회 2002 한국산업경영시스템학회 학술대회 Vol.2002 No.추계
In order to polish complicated-shaped inner surfaces of models, a new polishing method with magnetic congelation liquid was invented, we called this name MAGIC polishing tool. This tool is magnetic fluid at high temperature, can be solidified by cooling. The distribution of abrasives in the liquid can be controlled by magnetic field. Therefore we can make a special polishing tool which has well arranged abrasives inside after cooling. In order to know the fundamental polishing properties of this new polishing tool, brass plate was polished. The polishing tool was pressed and rotated against the brass plate in specified polishing time. After many experiments, it was found that this type of polishing tool provided enough removal rate and surface roughness.
고해주(Hai-Ju Ko),정윤교(Yoon-Gyo Jung) 한국기계가공학회 2007 한국기계가공학회지 Vol.6 No.3
Recently, the machine tools called multi-task machines, which mounted rotary axes on the table or spindle are used increasingly. Accordingly, multi-task machine tool takes a growing interest on the motion accuracy of feed drive system. In this study, measurement and diagnosis of motion errors ware attempted from circular pattern obtained by using DBB (Double ball bar) device. Those were obtained at both clockwise and counter clockwise motions in mutually perpendicularly intersecting three planes. The reliability of error measurement system for multi-task machine tool was verified by the direct test cutting.
MC-Space 알고리즘을 이용한 역공학 효율성 증대에 관한 연구
황종대(Jong-Dae Hwang),정윤교(Yoon-Gyo Jung),정종윤(Jong-Yoon Jung) 한국생산제조학회 2005 한국공작기계학회 추계학술대회논문집 Vol.2005 No.-
This study deals with the improvement of efficiency in the aspect of accuracy and time reduction in the reverse engineering. For this, two main strategies are applied in this paper. One is the path smoothness strategy, the other is the collision free strategy. Path smoothness strategy adopts modified B-spline algorithm that is constructed with altered control vertices. It allows improvement of accuracy of reverse engineering with faired surface. Collision free strategy adopts configuration space algorithm defined by two parameters which determine the probe posture. It allows a time reduction of reverse engineering without collision. So this two strategies are named, MC-Space algorithm.
정현철(Hyoun-Chul Jung),황종대(Jong-Dae Hwang),김상명(Sang-Myung Kim),정윤교(Yoon-Gyo Jung) 한국기계가공학회 2011 한국기계가공학회지 Vol.10 No.2
In order to develop a practical postprocessor for 5-axis machining, the general equations of numerically controlled (NC) data for 5-axis configurations with not only non-orthogonal rotary axes but also orthogonal rotary axes were exactly expressed by the inverse kinematics, and a Windows-based postprocessor written in Visual Basic was developed according to the proposed algorithm. The developed postprocessor is a general system that suitable for all kinds of 5-axis machine tool with orthogonal and non-orthogonal rotary axes. Through implementation of the developed postprocessor and verification by a cutting simulation and machining experiment, the effectiveness of the proposed algorithm is confirmed. Compatibility is improved by allowing exchange of data formats such as rotational tool center position (RTCP) controlled NC data, vector post NC data, and program object file (POF) cutter location (CL)data, and convenience is increased by adding the function of work-piece origin offset. Consequently, the technology of practical post-processor for 5-axis machining is developed.
임펠러의 5축 CAM 자동화 모듈(E-ICAM)의 개발
정현철(Hyoun-Chul Jung),황종대(Jong-Dae Hwang),정윤교(Yoon-Gyo Jung) 한국기계가공학회 2011 한국기계가공학회지 Vol.10 No.4
An impeller is difficult to machine because of severe collision due to the complex shape, overlapping and twisted shape that form impeller blades. So, most CAM software companies have developed CAM module for manufacturing impeller in addition to their CAM software. But it is not still easy for inexperienced users to machine impellers. The purpose of this paper is the development of automatic CAM module for manufacturing impeller(E-ICAM) which is based on visual basic language and it is used CATIA graphical environment in order to be easily machining impellers. Automatic CAM module for manufacturing of impellers generates tool path, and proposes recommended cutting condition according to the material of stock and tool. In addition, it has also included a post processor for 5-axis control machining. Therefore the user can easily machine impellers using this automation module.
원전 CEDM 노즐의 밀봉보수용접시 발생하는 잔류응력에 대한 해석적 연구
강종호(Jong-Ho Kang),정윤교(Yoon Gyo Jung),장윤찬(Yun-Chan Jang),이재봉(Ja-Bong Lee),이원근(Won-Geun Yi),조영태(Young Tae Cho) 대한용접·접합학회 2018 대한용접·접합학회지 Vol.36 No.2
The reactor vessel closure head has many CEDM nozzles through which the control element drive mechanisms pass. The CEDM nozzle weld region of the reactor vessel closure head is composed of Alloy 600 material. It has been found that cracks occur due to the high stress generated during normal operation of the nuclear power plant and the contact environment with the primary cooling water. Seal Weld Repair blocks the environmental factor that may causes primary water stress corrosion cracking(PWSCC) by covering Alloy 600 weld region which is susceptible to PWSCC with Alloy 690 resistant to the stress corrosion cracking. In this study, a finite element analysis was performed to evaluate the effect of residual stress formation by seal weld repair in the nuclear power plant CEDM nozzle. The thickness of the welded structure and the number of welded layers were considered as variables. As a result, we showed that seal weld repair for J-groove weldment of CEDM nozzle can release the tensile residual stress so that the possibility of occurrence of PWSCC can be reduced. Also, it has shown that a multi-layer is more effective and thicker weld bead is more secured for reducing residual stresses in J-groove weld.