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Geometric Modeling: The Interface Between CAD and CAM (pp.6-17)
정원량(Chung Won Lyang) 한국정보과학회 1979 정보과학회논문지 Vol.6 No.1
본 논문은 integrated CAD/CAM system의 문제들을, 특히 interface문제들을 논한다. 두 종류의 integration 이, 즉 vertical 과 horizontal, 토론되어 있다. CAD/CAM을 위한 Model (system) 이 소개되었고, model은 상호 연관된 여섯개의 submodel들로 구성되었다. 이 submodel들은 graphics, geometric, applications, analysis, documentation, 그리고 manufacturing model등이다. 이 model system으로부터 geometric model이 가장 바람직한 설계와 제조간의 interface 임을 추론하였으며, geometric model의 설명 및 예제가 뒤따른다. This paper is addressed to the problems of Integrated CAD/CAM systems, in parti cular, those of Interfaces. Two types of integration-vertical and horizontal-have been discussed for successful integration. A model(system) for CAD/CAM is introduced which consists of six interconnected submodels-graphics, geometric, applications, analysis, documentation, and manufacturing. From this model system, the geometric model is shown to be the most desirable interface between design and manufacturing, and its description is given.
유전자 알고리즘과 신경회로망을 이용한 고속 확관기의 확관속도 최적화
정원지,김재량,김진한,홍대선,강흥식,김동성 한국공작기계학회 2005 한국생산제조학회지 Vol.14 No.2
This paper presents the optimization of expanding velocity for tube expanding process in the manufacturing of a heat exchanger. In specific, the expanding velocity has a great influence on the performance of a heat exchanger because it is a key variable determining the quantity of tube expanding at assembly stage as well as a key parameter determining overall production rate. The simulation showed that the genetic algorithm used in this paper resulted in the optimal tube expanding velocity by performing the following series of iteration; the generation of arbitrary population for tube expanding parameters, consequently the generation of tube expanding velocities, the evaluation of tube expanding quantity using the pre-trained data of plastic deformation by means of a neural network, and finally the generation of next population using a penalty function and a Roulette wheel method.
Maypole Type 편조기의 Guide Track의 동적 모델링 및 해석
정원지,김재량,최선준,김임선 한국공작기계학회 2003 한국생산제조학회지 Vol.12 No.4
Braiding machines of maypole type complex guide tracks. It is not easy to speed up driers while carriers are moving at high speed. This paper presents a new design approach using dynamic analysis and modeling for moving carriers on the guided tracks. The proposed approach will be shown to be effective by using simulation tool, WORKING MODEL 2D^??, for high drivers on new models of braiding machines of maypole type.
성인 수술환자에서 Lactate Ringer액을 수술중 유지 및 보충액으로 사용한 경우의 혈당치 변화에 대한 연구
정성량,김수영,김성순 東國大學校醫學硏究所 1993 東國醫學 Vol.1 No.-
수술중 정주되는 수액에 포도당을 첨가시키는 문제는 수 십년 동안 논쟁이 되어왔다. 에테르 마취중 생기는 고혈당증은 마취과의사로 하여금 수술환자의 술중 당불인내성을 믿게하였고 이의 사용을 제한시키는 결과가 되었다. 아편양제재나 강력한 흡입마취제 등 전신마취에 새롭게 사용되는 약물들은 고혈당을 일으키는 경향이 적으며, 술전 금식기간으로 인해 저혈당의 결과가 초래될 수 있다. 따라서 많은 마취의들은 술중 수액에 포도당이 첨가되어야 한다고 느끼고 있다. 본 연구의 목적은 성인환자가 정맥용 수액으로 사용되는 유산염 링거액만을 술중 유지 및 보충액으로 사용한 경우 혈당농도가 안전한 범위에서 유지되는지를 관찰하려 함이다. 연구대상은 대사성 질환 및 간질환이 없는 미국 마취과학회 분류에 의한 환자상태가 1 혹은 2에 해당하는 72명을 임의로 선택했다. 연구결과, 전체 환자군 및 성별, 연령, 체중, 마취방법, 금식기간, 정주된 수액량 등의 개별군에서 술 전후의 혈당치 변화는 통계적으로 유의하지 않았다. The role of sugar in intravenous solutions has been debated through the decades. The hyperglycemia which occurs with ether anesthesia caused anesthesiologists to believe that patients were intolerant of sugar during anesthesia, resulting in withholding of this substance. The newer regimens of general anesthesia using an opioid or potent inhalational drug are less likely to hypoglycemia, and the preoperative period in which food is withheld can result in hypoglycemia. Accordingly, many practitioners feel that sugar should be given with intraoperative fluids. The aim of this study was to determine whether Lactated Ringer solution commonly used intraoperatively in adults patients produces blood glucose levels within a safe range. This study was undertaken to measure preoperative and postoperative blood concentration of glucose in 72 adult surgical patients of ASA Physical Status 1 and 2. Neither blood nor glucose containing solution was given intraoperatively to any patient. Only Lactated Ringer solution was given to maintain and supplement intravascular volume. In results, there was not significant changes between pre and postoperative values in all patients, and in 6 group divided according to sex, age, weight, method of anesthesia, NPO time, fluid volume infused.
국소마취제와 저용량 Morphine을 혼합 투여한 척추마취중 급격히 발생한 耆眠(Somnolence) : 증례 보고
정성량,이종성 東國大學校醫學硏究所 1994 東國醫學 Vol.2 No.-
지주막하강내와 경막외 아편양제재의 의한 진통 효과는 술 후, 산과적 그리고 만성 통증관리의 분명한 개선을 제공하였다. 몰핀은 가장 광범위하게 연구되었고 사용되는 아편양제재이며, 저용량(0.2-0.8mg)의 지주막하 주입후, 진통효과 발현은 30-60분 소요되며, 작용시간은 18-24시간 정도이다. 부작용으로 발생하는 호흡억제나 기면은 지주막하강내에서 연수와 제 4 뇌실로의 이동으로 인한 것이며, 주입 7-9시간 후 최고 발생 빈도를 나타낸다. 저자들은 저용량 몰핀의 지주막하강내 주입 40분 후 중증도의 기면 상태를 경험하였기에 참고 문헌과 함께 보고하고자 한다. Intrathecally administered opioids are usually administered by the lumbar approach as a single bolus. They can be included as a part of a spinal local anesthetic. Morphine requires 30 to 60 minutes to achieve an analgesic effect. Intrathecally administered morphine carries the risk of respiratory depression, secondary to rostral migration of drug, with a peak occurrence at 7 to 9 hours after administration. Late or delayed respiratory depression does not occur rapidly but rather is a slow-onset and indolent process and is associated with progressive somnolence. However we experienced sudden onset of excessive somnolence, 40 minutes after intrathecal administration of preservative free morphine 0.25mg, which was reversed by intravenous bolus of naloxone(1mg). Postoperatively naloxone by intravenous infusion (0.2mg/hr) was given for 10 hours. The duration of complete or near-complete postoperative analgesia was more than 24 hours.
김재량,정원지,김수태,최욱환 한국공작기계학회 2003 한국공작기계학회 추계학술대회논문집 Vol.2003 No.-
Tube expanding process is for combining a heat-sink plate with hair-pins (Cu-tube) through plastic deformation. The two parts, i, e., heat-sink plate and hair-pins are they components of a heat-exchanger for an air conditioner. This paper presents the analysis and dynamic modeling of a high-speed tube expander which integrates transfer of parts, fixing of parts, and tube expanding into one process. The 3-dimensional modeling of all the parts for the tube-expander was constructed using CATIA^(?). then the CATIA^(?) models are transferred into visualNastran^(?) to execute the 3-dimensional animation for checking prescribed cycle-time. The technique presented in this paper has been shown to be effective as a priori tool for verifying the design of a high-speed tube expander.