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박인옥(In Ok Park),서정열(Jung Yul Suh),정수석(Su Suk Chung),임성호(Seong Ho Lim),이은정(Eun Jung Rhee),윤중원(Jung Won Youn),이호철(Ho Chul Lee),박승하(Seung Ha Park),김정욱(Jeong Wook Kim),조용균(Yong Kyun Cho),이준행(Jun Haeng Lee 대한소화기기능성질환·운동학회 2002 Journal of Neurogastroenterology and Motility (JNM Vol.8 No.1
Achalasia can be provoked by organic causes, and it is called secondary achalasia. Sometimes it is very difficult to distingush secondary achalasia from primary achalasia. We report a case of secondary achalasia due to recurrence of stomach cancer. A 45-year-old man came to our hospital due to three months history of dysphagia and regurgitation. Barium esophagogram showed concentric narrowing at the distal esophagus and dilatation of proximal esophagus. The esophagogastroduodenoscopy showed stenosis of gastroesophageal junction and the endoscope could not pass through it, but there was no evidence of malignancy. Esophageal manometry showed aperistalsis, compatible with achalasia. Abdominal CT showed soft tissue density near the gastroesophageal junction. However it was not possible to differentiate whether it was due to adhesion or malignancy. For correct diagnosis and treatment, explorolaparotomy was performed and it was diagnosed as secondary achalasia due to recurrence of stomach cancer.(Korean Journal of Gastrointestinal Motility 2002;8:53-57)
정수석 한밭대학교 산업과학기술연구소 1994 논문집 Vol.2 No.-
One of the important way to imcrease relialility of the power plant is to measure the vibration of steam turbine blades in service operation. The measurement of the rotaing blades is usually executed by strain gauge, however, since the turbine has multiple stages, it is generally difficult to attach the strain gauges to the rotating blades obtain signals from the gauges, especially in the intermediate stages. Furthrmore, gauges and wirings must endure high centrifugal force of rotating blades, steam pressuse, and moisture in the turbine under operation. This paper presents noncontact measurement technology which measures the vibration of the steam turbine blades during operation using a laser beam installed in a stationary casing. Furthemore, this paper delineates technical problems in the measurement of the steam turbine bladders, such as the severe environment in which light is irregularly reflected, the durability of sensors, and small amplitude due to the shroud blade.
최종민,백고길,이병수,정수석,현동수,이호철 한밭대학교 생산기반기술연구소 2004 생산기반기술연구소 논문집 Vol.5 No.1
The major difference between multi heat pumps and conventional heat pumps is the number of indoor units. For multi heat pumps, it is essential to have precise control of cooling capacity distribution to each indoor unit having different cooling load. Through the experiments with various test conditions, it was found that an indoor unit affected another by refrigerant mass flow rates, evaporating pressures and cooling capacities when temperature differences of inlet air between two indoor units were exist.