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Maglev(UTM-02) Brake System Change from Pneumatic Bake System to Hydraulic Brake System
Kinam Kim,Sungwoon Hwang,Heekwon Jeon 한국철도학회 2015 International Journal of Railway Vol.8 No.1
The Maglev(UTM-02) project is leading by Korea Institute of Machinery & Materials and financially supported from the ministry of Commerce, Industry and Energy. The early development stagy of Maglev(UTM-02) was adopted the general urban railway pneumatic brake system due to the Korea domestic industrial environment. Currently there is two commercial operation Light Railway Train(LRT) system in Korea. One is U-Line in Uijungbu, and the other is Everline in Yongin. Both LRT systems are adopting high performance light weight hydraulic brake system. But those design and manufacturing core technology of the brake system is came from a major brake system companies located from aboard. Currently various studies have been continued to increase practical application and to improve competitiveness on performance for each sub-system of Maglev. Also in case of brake system, developing competitive hydraulic brake system is required. In this study, we have introduced the development process and performance evaluation of the new hydraulic brake system of Maglev.
Effect of Carbon on Wear Resistance in Self-Lubricating Fe-Cr-C-Mn-Cu Alloys
( Ki Nam Kim ),( Gyeong Su Shin ),( Myung Chul Park ),( Sung Yong Lee ),( Jae Yong Yun ),( Seon Jin Kim ) 대한금속재료학회(구 대한금속학회) 2012 대한금속·재료학회지 Vol.50 No.9
Recently, because of safety and environmental concerns, there has been a tendency to introduce solid self-lubricating composites for bearing materials. In this paper, we developed Fe-Cr-C-Mn-Cu cast composite alloys as a self-lubricating composite and investigated the effect of carbon on the formation of protective tribofilms during sliding. The wear resistance of these materials was mainly affected by carbon concentrations due to the fact that in particular wear passed from delamination to tribo-oxidation, reducing the wear rate. The improved wear resistance likely resulted from protective tribofilms that formed on the surface during sliding.
Hyaline Vascular-Type Castleman Disease Presenting as an Esophageal Submucosal Tumor: Case Report
Ki Nam Kim,Ki-Nam Lee,Myong Jin Kang,Mee Sook Roh,Pil Jo Choi,Doo Kyung Yang 대한영상의학회 2006 Korean Journal of Radiology Vol.7 No.1
Castleman disease is a relatively rare disorder of lymphoid tissue that involves the gastrointestinal tract in a variety of clinical and pathologic manifestations. A submucosal location has never been described in the medical literature. We report a case of esophageal Castleman disease involving thesubmucosal layer in a 62-year-old man, which was confirmed on pathology. Esophagography and CT demonstrated an intramural tumor, and a leiomyoma or leiomyosarcoma was suspected based on the known incidence of such tumors.
Pulmonary Paraganglioma Manifesting as an Endobronchial Mass
Ki Nam Kim,Ki-Nam Lee,Mee Sook Roh,Pil Jo Choi,Doo Kyung Yang 대한영상의학회 2008 Korean Journal of Radiology Vol.9 No.1
Thoracic paragangliomas comprise only 1 2% of all paragangliomas, including the adrenal pheochromocytomas, and these tumors are mostly found in the mediastinal compartments (1). To the best of our knowledge, there is only one case report in the pathology literature of endobronchial involvement by a primary pulmonary paraganglioma (2). We report here on the CT and bronchoscopic findings of a case of pathologically proven endobronchial paraganglioma in a 37-year-old woman. In our case, bronchoscopy and CT demonstrated an endobronchial hypervascular mass, which indicated the presence of carcinoid or hypervascular metastasis based on the known incidence of such tumors.
Sang-HyeonLee,JaekyuLee,YongseokAhn,DaewonHa,GwanhyeobKoh,TaeyoungChung,KinamKim,HyungSooUh 한국물리학회 2002 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.40 No.4
If the tight electrical performance requirements of the cell transistors used in giga-bit density DRAM are to be met, the leakage currents through the junction and the transistor should be controlled very carefully. In this paper, we propose a novel cell transistor using LOcalized Channel and Field Implantation (LOCFI) for low-power, reliable operation in a giga-bit density DRAM and beyond. When a LOCFI cell transistor is used, the data retention time is greatly improved by virtue of the reduced cell leakage currents resulting from the suppressed ion implantation damage at the storage node.