민감도 분석을 이용한 필릿용접용 용접변수 선정에 관한 연구

정재원,김일수,김학형,손성우,김인주,전광석 한국공작기계학회 2008 한국공작기계학회 춘계학술대회논문집 Vol.2008 No.-

Arc welding process is one of the most important technologies to join metal plates. Robotic welding offers the reduced manufacturing cost sought, but its widespread use demands a means of sensing and correcting for inaccuracies in the part, the fixturing, and the robot. A number of problems that need to be addressed in robotic arc welding processes include sensing, joint tracking, and lack of adequate mathematical models for parameter prediction and quality control, Problems with parameter settings and quality control occur frequently in the GMA(Gas Metal Arc) welding process because of the large number of interactive parameters that must be set and accurately controlled. The objectives of this paper are to realize the mapping characteristics of bead width using a sensitivity analysis and develop the neural network and multiple regression method, and finally select the most accurate model in order to control the weld qua1ity(bead width) for fillet welding. The experimental results show that the proposed neural network estimator can predict bead width with reasonable accuracy, and guarantee the uniform weld quality.

민감도 분석을 이용한 겹치기 필릿용접의 용접변수 선정에 관한 연구

정재원,김일수,김학형,손성우,전광석 한국공작기계학회 2008 한국공작기계학회 추계학술대회논문집 Vol.2008 No.-

Arc welding process is one of the most important technologies to join metal plates. Robotic welding offers the reduced manufacturing cost sought, but its widespread use demands a means of sensing and correcting for inaccuracies in the part, the fixturing, and the robot. A number of problems that need to be addressed in robotic arc welding processes include sensing, joint tracking, and lack of adequate mathematical models for parameter prediction and quality control. Problems with parameter settings and quality control occur frequently in the GMA(Gas Metal Arc) welding process because of the large number of interactive parameters that must be set and accurately controlled. The objectives of this paper are to realize the mapping characteristics of bead width using a sensitivity analysis and multiple regression method, and finally select the most accurate model in order to control the weld quality(bead reinforcement area, bead penetration area) for lap joint fillet welding.

AutoCAD 프로그램을 이용한 자동 펌프설계 시스템 개발

김일수,정영재,이창우,박주석 한국공작기계학회 2002 한국생산제조학회지 Vol.11 No.1

Recently, industry has moved towards automated operations with the goal of achieving better product quality, greater productivity and reliability. The pump design is characterized by extensive utilization of the related database which contains performance data. The inputs to the system are through interactive dialogue sessions and the basic input consist of flow rate, head of fluid, efficiency and the customer special requirements. These basic inputs along with the numerous rules in the knowledge bases and the mathematical modelling enable the effective design of the pump industry. This paper represents the development of an automatic pump design system that was composed of a main program, the data input module, the drawing module, the drawing edit module, and was programed y the AutoLISP language under the AutoCAD program. The developed system ultimately generates the design for a pump through the AutoCAD language.

공기압 실린더의 위치제어기 선정에 관한 연구

김일수,김기우,정영재,손준식,송창재,박주석 한국공작기계학회 1999 한국생산제조학회지 Vol.8 No.6

This paper concentrates on the position control of a pneumatic cylinder under parameter variation. A closed-loop control is proposed to design the different controllers(P, PI, PID, PD controller) in order to choose the best controller based on the fast and accurate control of the system. It is shown that the control algorithm is robust and effective in attaining the fast and accurate position control of system under time-dependent parameter variation. Experimental results showed that PD controller law is effective to obtain the fast response and to increase the stability of the system. The method is a useful control algorithm which always automatically adjusts the position control in accordance with the error, using carrier wave of triangle type regardless of changes on the operating condition and physical differences between components.

절제술로 치료한 요도구 주위 낭종

이정우,서일영,정희종 원광대학교 의과학연구소 2009 圓光醫科學 Vol.24 No.1

요도구 주위 낭종은 드문 선천성 이상으로 대개 무증상이며, 증상이 있을 시 완전절제술이 필요하다. 저자들은 드문 요도구 주위 낭종 2례를 완전 절제술로 치료하였기에 문헌고찰과 함께 보고하는 바이다. Parameatal urethral cyst is a very rare congenital anomaly and very few cases has been reported in the literature. The usual age of presentation is early to late childhood. It is usually asymptomatic in infancy. The usual symptom are spraying or deflection of urinary stream and poor cosmesis. Complete excision of the cyst is required for treatment and prevention of recurrence. We report 2 cases of parameatal urethral cyst in 24-year-old and 38-year-old male.

정상 면역 환자에서 발생한 거대세포바이러스 대장염 1예

이창우,김남일,이구,서정일,양창헌,구정태 대한소화기학회 2000 대한소화기학회지 Vol.35 No.5

Cytomegalovirus (CMV) infection is common in immunocompetent individuals, causing a mild flu- like illness. Up to 81% of normal healthy individuals aged over 35 have raised CMV antibody titers. However, CMV infection causing colitis is rare but usually fatal. On the contrary, CMV colitis is common in immunosuppressed individuals, especially in those who are Human immunodeficiency virus (HIV) seropositive. We experienced a case of colitis caused by CMV, which was not related with immunosuppression. It remains unclear why the patients developed CMV colitis. Here, we report a case of CMV colitis in an immunocompetent adult, which was confirmed by histopathologic findings through colonoscopic biopsy.

空氣壓 변화에 의한 실린더의 最適 位置制御에 관한 硏究

박창언,김일수,김기우,정영재,손준식,송창재 木浦大學校 工業技術硏究所 1999 工業技術硏究誌 Vol.9 No.-

With the increasingly strict demands on accuracy position control of the production line, the modelling and control of the activated process have become a subject of great interest. Much efforts have been made in understanding and modelling of this process in the last decade. This thesis concentrates on the position control of Pneumatic cylinder under parameter variation. An adaptive control is proposed to design the defferent controllers(P, PI, PID, PD controller) in order to choose the best controller based on the fast and accurate control of the system. It is shown that the adaptive control algorithm is robust and effective in attaining the fast and accurate position control of system under time-dependent parameter variation. Experimental results showed that PD controller law is effective to obtain the fast response and to increase the stability of the system. The method is a useful control algorithm which always automatically adjusts the position control in accordance with the error, using carrier wave of triangle type regardless of changes on the operating condition and physical differences between components.

위의 유암종과 선종의 병발 1례

장재식,강혁주,이중현,서영범,윤병구,김용섭,이구,서정일,양창헌,이창우,김정란,윤환중 東國大學校醫學硏究所 2000 東國醫學 Vol.7 No.-

유암종은 전신에 퍼져 잇는 장크롬친화성 세포에서 기원하는데 위의 유암종은 비교적 드문 질환으로 모든 유암종의 1.9~2.2%에 해당하며 위에 발생하는 종양의 1% 미만에서 보고되고 있다. 유암종은 일반적으로 증상이 비특이적이고 면역조직화학검사에 의해서 진단되기 때문에 과거에는 드물게 발견되었으나 최근 내시경 기기 및 술기의 발전과 검사 빈도의 증가 및 면역조직화학검사의 발달로 진단율이 증가 추세에 있으며, 드물지만 유암종에서 선암과 공존하는 예들이 보고되고 있다. 저자들은 심와부 동통을 주소로 내원한 70세 남자 환자의 상부위장관내시경 검사에서 위체상부의 대만곡에서 0.4×0.4 cm 크기의 중간 함몰을 가진 Yamada 1형의 용종과 함께 전정부의 전벽에서 0.8×0.5 cm 크기의 융기된 점막 소견을 보여 조직학적으로 각각 위유암종 및 위선종임을 확진한 후 내시경적 용종 절제술로 치료한 1예를 경험하였기에 문헌고찰과 함께 보고하는 바이다. Carcinoid tumors are arisen from enterochromaffin cells, which are scattered throughout the body. These tumors are composed of variable numbers of cells that contain endocrine granules in their cytoplasm, which can be identified by immunohistochemistry and electron microscopy. Gastric carcinoid tumors are relatively rare tumor, the reported incidence being 1.9~2.2% of all carcinoid tumors and less than 1% of all gastric tumors. Sometimes, composite carcinoid tumors and adenocarcinoma is reported. We experienced a case of the coincidence of carcinoid tumor and adenoma at the other site of the stomach in a 70 year old male patient. Gastrofiberscope showed 0.4×0.4 cm sized Yamada type I polyp with central depression on the greater curvature of the proximal body and 0.8×0.5 cm sized focal slightly elevated mucosa on the anterior wall of the antrum. The endoscopic biopsy specimens revealed carcinoid tumor and tubular adenoma with moderate atypism, respectively. The carcinoid tumor and adenoma were removed by endoscopic polypectomy. According to the follow-up gastrofiberoscopy after 7 month later, both lesions were nearly normal mucosa except whitish atrophic change after polypectomy.

SENSORLESS VECTOR CONTROL OF INDUCTION MOTORS FOR WIND ENERGY APPLICATIONS USING MRAS AND ASO

Ill Woo Jeong,Won Shik Choi,Ki Hyun Park,Hyun Chul Park 한국신재생에너지학회 2012 AFORE Vol.2012 No.-

급성 췌장염의 예후판정에 있어 복부전산화 단층촬영의 의의

서정일(Jeong Ill Suh),장병익(Byeong Ik Jang),김태년(Tae Nyeun Kim),정문관(Moon Kwan Chung),이현우(Hyun Woo Lee),변우목(Woo Mok Byun) 대한내과학회 1995 대한내과학회지 Vol.48 No.2

N/A Objectives: The purpose of this study is to evaluate the usefulness of computed tomography (CT) in the prognosis of acute pancreatitis. Methods: 70 patients with acute pancreatitis visited to Yeungnam University hospital emergency room between March 1991 and April 1993 were studied prospectively with early computerized tomography. The diagnosis of pancreatitis was based on typical clinical presentation and elevation of serum amylase levels. Prognostic score, fasting days and hospital days were record. The initial computerized tomograpic findings were graded A to E and we studied the correlation of CT grade and prognostic score and fasting days and hospital days. And also we studied the correlation of CT grade and prognostic score. Result: 1) Prognostic score of acute pancreatitis correlated with fasting days and hospital days (p<0.05). 2) There was no correlation between CT grade and prognostic score (p>0.05). 3) CT grade correlated well with fasting days and hospital days (p<0.01). Conclusion: In conclusion, we suggest that both prognostic score (Ranson score, Glasgow score) and early CT examination of patients with acute pancreatitis are useful prognostic indicator.