• Proceedings of the Korea Society for Energy Engineering kosee Conference
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• 2004.05a
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• pp.159-164
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• 2004

• Proceedings of the Korean Nuclear Society Conference
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• 2001.10a
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• pp.357.2-357
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• 2001

• Proceedings of the Korean Society of Environment and Ecology Conference
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• 2003.04a
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• pp.73-74
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• 2003

• Proceedings of the Korean Institute Of Construction Engineering and Management
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• 2008.11a
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• pp.358-363
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• 2008

도시 광역화와 인구의 집중에 따라서, 도시 거주민의 삶의 질 향상을 위해서는 많은 기반이 필요하다. 이중에서 깨끗한 위생 환경을 위해서 용수의 공급 및 하수의 처리는 매우 중요한 문제라고 할 수 있다. 이를 위하여 많은 조사와 보수가 이루어지고 있지만, 관로의 내면을 조사하는 다양한 기법은 활발하게 이루어지고 있는 반면, 도로의 침하나, 관로 내부로의 침입수 또는 침출수 등을 유발할 수 있는 관로 배면의 상태를 조사하는 기법은 아직 미비한 상태라고 할 수 있다. 따라서 본 연구에서는 이러한 관로의 배면에 대한 정보를 취득하기 위하여 매질을 통과하여 정보를 취득할 수 있는 지중탐사레이더(GPR)을 이용하여 관로의 배면 상태를 탐사하기 위한 기본 반사 특성을 조사하고 이를 기준으로 실제대상물의 반사 특성을 조사 분석하여 관로 배면 지반의 특성을 조사, 평가하고자 한다.

• The Journal of Korean Academy of Prosthodontics
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• v.46 no.4
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• pp.381-395
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• 2008

Purpoose: For decades dental implants have been used widely in the field of prosthetic dentistry. However there is confusion when establishing treatment plans in cases where some teeth are remained but an insufficient number of implants can be used due to limited anatomical status and ecomomical problems. Many clinicians have tried to connect natural teeth and implants, and it still has controversy. But, there have been few studies on mechanical analysis of connecting natural teeth and implants with konus telescopic removable partial dentures. The purpose of this study was to analyze the stress distribution of prosthesis, abutment and alveolar bone when teeth and implants were connected with the konus telescopic denture, by means of 3-dimensional finite element analysis. Material and methods: The assumption of this study was that there were 2 mandibular canine (11 mm in length, 4 mm in diameter) and 2 implants(10 mm in length, 4 mm in diameter) which are located in the second premolar region. The mandible, teeth, implants, abutments, and connectors are modeled, and analyzed with the commercial software, ANSYS Version 8.1(Swanson, Inc., USA). The control group used implants instead of natural teeth. 21038 elements, 23544 nodes were used in experimental group and 107595 elements, 21963 nodes were used in control group, Stress distribution was evaluated under 150 N vertical load on 3 experimental conditions - between teeth and implants (Load case 1), posterior to implants (Load case 2), between natural teeth (Load case 3). Results: 1. In all load cases, higher von mises stress value was observed in the experimental group. 2. Maximum von miss stress observed in all load cases and all locations were as follows ; a. 929.44 Mpa in the experimental group, 640.044 Mpa in the control group in outer crown and connector - The experimental group showed 1.45 times high value compared with the control group. b. 145,051 Mpa in the experimental group, 142.338 Mpa in the control group in abutment - The experimental group showed 1.02times high value compared with the control group. c. 32.489 Mpa in the experimental group, 25.765 Mpa in the control group in alveolar bone - The experimental group showed 1.26times higher value compared with the control group. 3. All maximum von mises stress was observed in load case 2, and maxim von mises stress in alveolar bone was 32.489 Mpa at which implant failure cannot occur. 4. If maximum von mises stress is compared between two groups, the value of the experimental group is 1.02 times higher than the control group in abutment, 1.26 times higher than the control group in alveolar bone. Conclusion: If natural teeth and implants are connected with the konus telescopic denture, maximum stress will be similar in abutment, 1.26 times higher in alveolar bone than the control group. With this result, there may be possible to make to avoid konus telescopic dentures where natural teeth and implants exist together.

• The Journal of Korean Academy of Prosthodontics
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• v.53 no.1
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• pp.74-80
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• 2015

When oral cancer is occured, one may experience problems such as lip defect, necrosis of periodontal tissue and cervical caries caused by radiotherapy. According to ADI (Association of dental implantology), recent radiotherapy on jaw bone could be a relative contraindication of implant treatment. Due to this controversy, in most cases, treatment is done with removable dentures rather than implants. Especially, lip defect caused by an oral cancer operation have a serious repercussion on the retention of the denture. In this case report, patient with upper lip cancer had undergone resection primarily and secondary radiotherapy was done periodically. As a result, upper teeth of patient were extracted gradually and lower teeth showed very poor periodontal status. Therefore, Polident$^{(R)}$ denture adhesive cream (GlaxoSmithKline, London, England) was applied on maxillary complete denture to overcome reduced retention due to the lip defect and double crown RPD with friction pin was applied on the mandible successfully for two years.

• Journal of Hydrogen and New Energy
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• v.10 no.1
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• pp.19-26
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• 1999

The effectiveness of a double-tube heat exchanger has been investigated experimentally. This problem is of particular interest in the design of the heat exchanger in a hydrogen liquefaction system. Temperature, pressure, and mass flow rate for hydrogen were measured both in inner tube and in annulus of a double-tube heat exchanger. The effectiveness could be evaluated from the measured temperature and mass flow rate. It is found that the effectiveness increases with an increase in the heat transfer area of a double-tube heat exchanger and with a decrease of the heat capacity ratio. But the increase rate of the effectiveness decreased with a decrease of the heat capacity ratio. Therefore, it is presented that a criterion for selecting the heat exchanger length and heat capacity ratio to obtain the effectiveness required in a hydrogen liquefaction system.

• Journal of Dental Rehabilitation and Applied Science
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• v.34 no.4
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• pp.317-323
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• 2018

When oral cancer develops in the maxilla, oro-nasal communication occurs after surgical treatment including removal of the primary site. Restoration through an obturator is necessary to prevent food from storing due to non-oral opening, and to ensure proper pronunciation and aesthetic restoration. In this case, the patient was treated with right hemi-maxillectomy due to oral cancer and has residual abutment and poor periodontal support due to the effect of head and neck radiotherapy. The obturator was treated with a hybrid telescopic double crown denture. Reporting a successful prognosis in 18 months of follow-up.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.7 no.3
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• pp.298-307
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• 2006

TEE Forming process for HDPE(High Density PolyEthylen) pipe has been analyzed by using rigid plastic finite element code, DEFORM-3D. TEE of HDPE pipes is necessary to connect main pipe with branch pipe and change the flow direction of hot water. A HDPE pipe is used as a insulator to maintain the temperature of hot water A butt welding process through TEE forming for a HDPE pipe is a updated process improving the strength of welding part compared to conventional extrusion welding process. The Experiment of Hot and Cold Forming have been performed. The design parameters such as a initial hole shape have been obtained through rigid-plastic finite element analysis, which is applied to the actual manufacturing process.

• 녹색21
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• s.10
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• pp.8-13
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• 2006

환경전문기자회는 이치범 환경부장관 등 환경부 실무과장들이 참여한 가운데 2007년도 업무보고와 간담회를 가졌다. 주요내용은 환경부와 산자부가 이중으로 REACH제도를 홍보하는 이유, 방치폐기물 처리대책 및 재활용산업 육성방안, 이천 하이닉스 증설 관련, 수변구역 매수토지 관리방안, 친환경상품 구매 촉진을 위해 관련 기관 및 단체가 함께하는 방안, 국장급 인사에 대하여 본부와 지방청을 고루 아우르는 방안, 음식물쓰레기 처리 통계 개선방안, 올해 심화될 것으로 예상되는 황사대책, 바이오디젤 확대 방안 등이 집중 논의됐다.