• The Journal of Korean Academy of Prosthodontics
• /
• v.40 no.2
• /
• pp.156-171
• /
• 2002

The purpose of this study was to measure and compare the strains produced by screw-tightening implant frameworks fabricated by aye different fabrication methods; (1) one-piece cast using plastic sleeve, (2) one-piece cast using gold cylinder, (3) laser welding, (4) soldering, and (5) electrical discharge machining, and also to measure and compare the strains produced when the order of screw tightening was changed A research model incorporating eighteen strain gages was made to measure the fit of implant frameworks in three dimensions. Three implants aligned in an arc were fixed on the top ends of the L-shape aluminum bars of the research model, and standard abutments were joined to the implants with abutment screws. Five types of implant framework were placed on the abutments and screwed by a torque wrench using 10 Ncm. Under the conditions of this study, the following conclusions were drawn: 1. The electrical discharge machining group showed the smallest magnitude of strain, followed by the soldering group, the laser welding group, the one-piece cast group using gold cylinder, and the one-piece cast group using plastic sleeve. However, among the magnitude of strain for the remaining groups except the electrical discharge machining group, there were not significant differences. 2. When the order of screw tightening was changed, there were not significant differences in the magnitude of strain. 3. In comparison with the electrical discharge machining group, the laser welding group and the one-piece cast groups showed greater horizontal distortion and the soldering group showed greater horizontal and vertical distortion.

• Journal of the Korean Society of Costume
• /
• v.63 no.5
• /
• pp.51-60
• /
• 2013

The study is intended to produce a modern Cheollik style one-piece dress that stays within the traditional concept of beauty. Specially, the study focuses on Cheollik of the Joseon Dynasty among various traditional costumes as its motif. As the Joseon Dynasty changed, the forms of Cheollik changed with it. People of all classes from the commoners to king wore it. Cheolik was different from other traditional costumes because the top and bottom were connected and so it was an easy to wear one-piece clothing. Initially, the ratio of upper and lower parts was one to one, but later on, the ratio changed to 1:2 as the topcoat became wider and length of the skirt was lengthened. Diverse types of pleat emerged such as fine pleat, opposite pleat and long pleat. Collar and string were also diversified and studied by applying the components. To study it, the author considered the previous studies about Cheollik first. Then, the Cheollik of the Joseon Dynasty was reproduced. Thirdly, with the motif of Cheollik components, the materials suitable to a one-piece dress design were selected, dyed naturally. Finally, One piece dress design was utilized by using the components and features of Cheollik. 8 pieces of one-piece dresses were made as an ordinary dress and the materials such as ramie, Oksa, hemp, silk, Yeon-hwamun dan and artificial silk were used. Hopefully, other traditional costumes can develop as a practical and ordinary dress.

• Journal of Ocean Engineering and Technology
• /
• v.33 no.4
• /
• pp.340-349
• /
• 2019

In the case of a fire accident on a ship or an offshore plant, the design of the bulkhead penetration piece must be verified via a fire test procedure (FTP), as specified by the Maritime Safety Committee (MSC). The purpose of this study is to verify both the numerical analysis results and the design specifications for penetration pieces that could be applied to the A60 class bulkhead division. In this study, the FTP was carried out in accordance with the test procedure prescribed in the MSC regulation. In order to review the fire resistance performance according to the material type, bulkhead penetration pieces for the FTP were made from brass, carbon steel for machine structures (S45C), and austenite stainless steel (SUS316). In addition, spray-type insulation and mechanical fastener-type insulation were applied to investigate the fire resistance performance according to the type of insulation. To verify the heat transfer numerical analysis results for the A60 class bulkhead penetrating piece from this test study, the design specifications of the penetrating piece material and the insulation type applicable to a ship and an offshore plant were identified.

• Journal of the Korean Society of Manufacturing Process Engineers
• /
• v.20 no.6
• /
• pp.33-43
• /
• 2021

A60 class bulkhead penetration piece is a fire resistance system installed on a bulkhead compartment to protect lives and to prevent flame diffusion in a fire accident on a ship and offshore plant. This study focuses on the approximate optimization of the fire resistance design of the A60 class bulkhead penetration piece using a multi-island genetic algorithm. Transient heat transfer analysis was performed to evaluate the fire resistance design of the A60 class bulkhead penetration piece. For approximate optimization, the bulkhead penetration piece length, diameter, material type, and insulation density were considered discrete design variables; moreover, temperature, cost, and productivity were considered constraint functions. The approximate optimum design problem based on the meta-model was formulated by determining the discrete design variables by minimizing the weight of the A60 class bulkhead penetration piece subject to the constraint functions. The meta-models used for the approximate optimization were the Kriging model, response surface method, and radial basis function-based neural network. The results from the approximate optimization were compared to the actual results of the analysis to determine approximate accuracy. We conclude that the radial basis function-based neural network among the meta-models used in the approximate optimization generates the most accurate optimum design results for the fire resistance design of the A60 class bulkhead penetration piece.

• 대한치과보철학회:학술대회논문집
• /
• 2005.11a
• /
• pp.106-106
• /
• 2005

• Journal of the Korea Society of Computer and Information
• /
• v.9 no.1
• /
• pp.45-54
• /
• 2004

A CAD and diagraming program of clothing and fashion design field within the country variously exist, but this paper implements design CAD and diagraming system based on diagraming piece with database system. Proposal system can be used quickly and easily to designer because of providing various diagraming piece. intend to utilize the data to diagraming piece provide with various classification and key word. 2D fashion design system provide GUI, various drawing tool, vector type document. application data based on XML, diverse library and easy mapping capacity for user.

• The Journal of Korean Academy of Prosthodontics
• /
• v.20 no.1
• /
• pp.19-23
• /
• 1982

귀금속의 가격 앙등은 치과보철치료에 있어서 비귀금속합금의 이용을 촉진 시키고 있다. 가공의치 제작에 비귀금속합금을 이용할 경우에는 납착상태에 대한 신빙성 문제로 인하여 one-piece cast법이 널리 사용되고 있으나 이에 의하여 제작된 가공의치의 적합도에 관하여는 논의가 분분하다. 고로 저자는 one-piece cast법에 의한 비귀금속 가공의치에 있어서 경화수축에 따른 거리변화를 계측현미경을 이용하여 연구한 결과 다음과 같은 결론을 얻었다. 1. 4개 치아를 포함하는 가공의치 제작에 있어서 Hi-Temp 매몰재는 비귀금속합금(Lite-Cast B)의 수축을 보상하고도 남음이 있다. 2. Hi-Temp에 사용되는 액(液)을 증류수로 희석할 경우 그 농도 조절에 의하여 Hi-Temp 매몰재의 팽창을 크게 변화시킬 수 있다. 3. one-piece cast법에 의한 가공의치 제작의 문제점은 두 지대치의 서로 바라보고 있는 인접면간의 거리는 증가됨이 없이 외측 인접면간의 거리만 다소 증가되어야 한다는 것이다. 4. 비귀금속합금을 이용하여 수직적인 큰 변형없이 4개 치아가 포함되는 가공의치를 제작할 수 있다. 5. 수개 치아를 포함하는 가공의치의 주조 정확도를 계측할 수 있는 새로운 방법을 창안하였다.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
• /
• v.35 no.4
• /
• pp.276-279
• /
• 2009

The aim of this case study was to report the clinical outcome of immediate provisionalization using one-piece narrow diameter (3.0mm) implants in missing maxillary lateral or mandibular incisors. The present study included 36 patients who were treated with 62 one-piece narrow diameter implants. After implant placement, immediate provisional restorations were delivered. All implants showed favorable osseointegration and after progressive loading from 3 months to 9 months (average of 5 months), final restorations were completed without failure in all cases. A survival rate of 100 % (62 of 62) was observed up to 23 months of observation (average of 12.6 months).

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.7 no.1
• /
• pp.57-62
• /
• 2006

This treatise proposes a develop system that manufactures 3D clothes model who is used in 3D clothes getting dressed simulation. Need 3D human body model and 3D clothes model to do getting dressed simulation. Create priority work Matrix javelin to design clothes model and design 2D piece from designer Connect designed piece plain using backstitch line and create numerical value data because using designed piece and backstitch data finally and make 3D clothes model. Consist of piece design module, to read clothes data and save module, getting dressed simulation module in system that propose in this treatise.

• Journal of Conservation Science
• /
• v.37 no.4
• /
• pp.340-356
• /
• 2021

We have tried the experimental research of lost-wax casting to reconstruct Gilt-Bronze Pensive Bodhisattva; preliminary and reconstruction experiment based on ancient texts. Main object to reconstruct is Korean National Treasure No.83, Gilt-Bronze Pensive Bodhisattva (Maitreya), then we measure alloy ratio and casting method based on the scientific analysis. Other impurities were removed from the base metal components(copper : tin : lead) and their ratio was set to 95.5 : 6.5 : 3 where the ratios for tin and lead were increased by 2.5% each. The piece-mold casting method was used, and piece-mold casting experiments were carried out twice in this study but supplementary research on piece-mold casting was necessary. The microstructure was confirmed to be typical cast microstructure and the component analysis result was similar to that of the prior study. Analysis of the chemical composition is confirmed to copper, tin, lead, and zinc, and the chemical composition of the matrix was 87.8%Cu-7.5%Sn-2.7%Pb-2.1%Zn, and similar to previous experimental research. Also resulted in the detection of small impurity in Zn. Analysis of the mould revealed that the mould was fabricated by adding quartz and organic matter for structural stability, fire resistance, and air permeability. We expect that our research will contribute to provide base data for advanced researches in future.