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2축 시퀀스 제어 스테이지와 미세입자 분사장치에 의한 형상 분사가공시 실험계획법에 의한 주요인자 검출
황철웅,이세한,왕덕현 한국기계가공학회 2020 한국기계가공학회지 Vol.19 No.11
To determine the effective factors for microparticle blasting with precise sequence position control in thex-axis and y-axis directions, we conducted a statistical experimental analysis of blasted square shapes byconsidering five condition factors. The control input and output were operated simultaneously by rotation–linear motion conversion and fine particles were blasted onto the aluminum specimen by precise positioncontrol driving using multiple execution codes. The micro-driving device used for processing was capable ofmicroparticle blasting and of controlling the system through contact with a limit sensor at high speed and atwo-degree-of-freedom driving mechanism. Our experiments were conducted on 1,050 specimens of purealuminum (containing <1% of other elements). The effects of several factors (e.g., particle and nozzlediameters, blasting pressure, and federate and blasting cycle numbers) on the surface roughness and blastedsurface’s depth were verified through a statistical experimental analysis by applying the dispersion analysismethod. This statistical analysis revealed that the nozzle diameter, the blasting pressure, and the blasting cyclenumber were the dominant factors.
황철웅,정성문,김경아,양전호,이준성,문영수,전영빈,조상형,이우진,임병욱,류웅,김종훈,박혜연,박경일 대한소화기내시경학회 2005 Clinical Endoscopy Vol.31 No.4
The liver fluke, Clonorchis sinensis is an important human parasite and is endemic in Eastern Asia including Korea, China, and Japan. Patients acquire the infestation by eating raw or undercooked freshwater fish. Radiologic examinations usually reveal dilated peripheral intrahepatic bile ducts and normal extrahepatic bile duct. The diagnosis of clonorchiasis may sometimes be difficult and a presentation as an obstructive mass at the common hepatic duct is a rare event. Here we report a case of clonorchiasis of 54-year- old woman presented with epigastric pain. Endoscopic retrograde cholangiography revealed a mass at the common hepatic duct with dilatation of the intrahepatic ducts mimicking cholangiocarcinoma. Using an endoscopic basket, muddy, sludge-like materials were extracted through the papillary orifice. We report this case with a review of literatures. 간흡충(Clonorchis sinensis)은 우리나라에서 대변검사로 진단되는 윤충 감염증 중 감염률 1위를 차지하는 음식물 매개성 기생충으로서 성충은 말초 간내담관, 간외담관, 드물게는 담낭 또는 췌관 등에 존재하며 오래 지속되면 합병증으로 담관결석, 재발성 화농성 담관염, 담관농양, 담관협착 및 담도암을 일으킬 수 있다. 간흡충증의 담관조영상은 성체에 의한 충만결손, 말초담관의 폐색, 불규칙하거나 희미한 담관, 미만성 간내담관 확장, 간내 다관징후 등의 소견을 보이나 간외담관에 종괴를 형성하여 폐쇄를 일으키는 경우는 매우 드물다. 저자들은 간헐적 복통을 주소로 내원한 54세 여자 환자에서 종괴를 형성하여 총간관폐쇄를 유발하여 간문부 담관암과 유사하게 보였으나, 내시경 역행성 담관조영술 및 내시경으로 제거하여 치료한 간흡충증 1예를 경험하였기에 문헌고찰과 함께 보고하는 바이다.
미세입자 분사가공용 시퀸스 제어가 가능한 2축 스테이지 개발에 관한 연구
황철웅(Chul-Woong Hwang),이세한(Sea-Han Lee),왕덕현(Duck Hyun Wang) 한국기계가공학회 2020 한국기계가공학회지 Vol.19 No.8
A stable rotational-to-linear motion transformation structure using a driving mechanism with 2 degrees of freedom was developed for an orthogonal mechanism to prevent the interference of each axis in 2D motion. In this mechanism, a step motor was used for precise position control. This structure was developed to maneuver workparts in micro particle blast machining experiments. To determine the real-time performance of micro particle blast machining, the control, input, and output were operated simultaneously and precise position control was implemented, using a timer interrupt with multiple execution codes. The two step motors obtained precise position control by removing backlash with a ball-screw mechanism. The device has menu-type control codes for user-friendliness, and real-time sequence control was simultaneously adopted for user control input.
함초롬,박경일,박혜연,황철웅,김종연,김태년,진재용,이성순 白中央醫療院 2005 仁濟醫學 Vol.26 No.1
Vocal cord dysfunction (VCD) is a respiratory disorder characterized by the abnormal adduction of the vocal cords upon inspiration, expiration, or both, leading to a diverse array of acute obstructive airway signs and symptoms (wheezing, chest tightness, shortness of breath, and cough). VCD frequently mimics or confounds asthma. Misdiagnosis as asthma has led to inappropriate treatment, most notably with high-dose corticosteroids. Mistaken for anaphylaxis or angioedema, VCD has led to intubation and tracheostomy. VCD should be suspected in patients who are treated aggressively for asthma but continue to experience dyspnea. The diagnosis of VCD is made from direct visualization of the vocal cords during an attack. Inspiratory, anterior vocal cord closure with a posterior glottic chink is seen. On pulmonary function testing, a pattern of "saw-toothing", or fluttering of the inspiratory limb, representing fluctuations in the abnormal cord motion is seen in VCD patient. Treatment includes discussion of the diagnosis with the patients, discontinuing unnecessary medications, using of a helium-oxygen mixture in acute attack. Speech therapy and psychotherapy are the mainstays of long-term treatment. Here in we report a case of VCD in company with asthma.
Clopidogrel에 의해 발생된 전신 염증 반응 증후군 1례
김민환,김종훈,박경일,박혜연,황철웅,김의석,도준형,남궁준,이성윤,이원로 白中央醫療院 2005 仁濟醫學 Vol.26 No.1
Clopidogrel bisulfate, a widely used inhibitor of platelet aggregation, is considered at least as safe as aspirin. We describe a 61 year old male patient who developed a systemic inflammatory response syndrome consisting of high fever, rash, chills, impaired liver function, and mild leukopenia after receiving clopidogrel after coronary angiography and stent implantation. The reaction resolved promptly after withdrawal of the drug, thus making the diagnosis of a clopidogrel induced reaction highly probable.