• Journal of Drive and Control
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• v.16 no.4
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• pp.114-116
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• 2019

• Journal of Drive and Control
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• v.9 no.1
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• pp.26-30
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• 2012

• Journal of Drive and Control
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• v.10 no.3
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• pp.36-40
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• 2013

• Proceedings of the KOR-BRONCHOESO Conference
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• 1983.05a
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• pp.7.1-7
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• 1983

Esophageal perforation occurred rarely, but it leads to a high mortality and morbidity. Main cause of esophageal perforation in Korea is instrumental perforation in patients with lye stricture of esophagus during diagnostic endoscopy or therapeutic bouginage. A case of 25-year-old male patient entered to outpatient clinic. Chief complaints were mild pain at swallowing, mild fever elevation and chest tightness with radiating pain to shoulder and interscapular region for 1 day. On the X-ray film with barium soaked cotton piece in esophagus, it was revealed that foreign body (fish bone) had been located on the level of 2nd vertebra with leakage of barium to mediastinum. The foreign body was removed with endoscopy in Dept. of otolaryngology, and cervical mediastinostomy was performed in Dept. of thoracic surgery.

• 월간 기계설비
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• s.226
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• pp.60-63
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• 2009

안전, 또 안전!은 아무리 강조해도 지나치지 않다. 한때 우리나라는 '안전불감증'이라 해도 과언이 아닐만큼 안전에 대한 의식이 저조해서 사고가 많았다. 이에 따라 각 건설현장에서는 안전에 대한 교육을 철저히 시키고 행동강령 주지 등 많은 노력을 기울여 왔다. 특히 가스와 관련한 사고는 대형사고로 번질 가능성이 높기 때문에 작업 시 더욱 주의를 필요로 한다. 본지는 가스시공 시의 일반적인 안전수칙과 탱크, 용기, 기계실, 고소작업, 용접작업 천공 분기작업, 도시가스 공급시설물 작업 시의 안전수칙에 대하여 게재한다.

• Journal of Korean Tunnelling and Underground Space Association
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• v.4 no.1
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• pp.13-25
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• 2002

The construction method for Young Dong Tunnel has been chosen following detailed risk assessment. In this paper, the specific risks to the project programme, associated with adopting either mechanical excavation in the form of a shielded TBM, or drill and blast excavation methods, are assessed. From the risk assessment results, and taking other important factors into account, such as project sensitivity and local experience, the recommendation is made that the relatively low risk drill-and-blast method is the most appropriate for construction of Young Dong Tunnel.

• Proceedings of the KSR Conference
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• 2002.05a
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• pp.200-206
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• 2002

The construction method for the Young Dong Tunnel has been chosen following detailed risk assessment. In this paper, the specific risks to the project programme, associated with adopting either mechanical excavation in the form of a shielded TBM, or drill and blast excavation methods, are assessed. From the risk assessment results, and taking other important factors into account, such as project sensitivity and local experience, the recommendation is made that the relatively low risk drill-and-blast method is the most appropriate for construction of the Young Dong tunnel.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.37 no.2
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• pp.193-198
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• 2013

In general, a product consists of one or more parts. Different parts of a product can perform the same function. According to "the design hypothesis of an integrated part", parts having the same function may be integrated into one part. A part can also perform more than one function. The form or material characteristic of a part may perform its function. In this study, we develop a method for defining the functions of components and for integrating parts having the same functions. We have successfully integrated some parts of a three-hole punch using the proposed method. The results satisfy axiomatic design.

• Journal of Korean Tunnelling and Underground Space Association
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• v.8 no.4
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• pp.345-354
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• 2006

During installation of face bolts, they are often deviated from the designed horizontal direction. In this study, a laboratory test and numerical analysis were conducted to examine the change of support effect by them. Also, the number of bolts to be added for achieving the designed support effect was considered. It was verified in this study that the horizontal installation is more effective. Under the test condition of this study, 1.5 bolts/section should be added in the face of which the installation density was 3 bolts/section when the bolts were installed with $R15^{\circ}$ angle from the horizontal position.

• Transactions of the Korean Society of Mechanical Engineers B
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• v.20 no.4
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• pp.1406-1415
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• 1996

Several recent studies have revealed that boiling heat transfer may be considerably enhanced in a narrow restricted region. In his study, the narrow restricted region was formed by attaching a perforated plate on top of a boiling surface. Through systematic experiments, effects of the hole size, hole pattern, gap width between the perforated plate and the boiling surface were investigated using water or R-113. Results show that perforated plates considerably enhance the boiling of water or R-113. For water, especially, they have outperformed commercial enhanced tubes, which confirms that boiling enhancement mechanism of the perforated plate (thin film evaporation beneath the elongated bubble) is very effective to the boiling of high surface tension liquids such as water. Optimum configuration was found - 3.0 mm hole diameter, 15 mm * 15 mm hole pattern, 0.3 ~ 0.5 mm gap width for water, and 2.0 mm hole diameter, 3.5 mm * 3.5 mm hole pattern, O.5 mm gap width for R-113. A correlation which correlates most of the data within .+-. 30% was also developed.