• Proceedings of the Korean Society of Precision Engineering Conference
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• 1995.10a
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• pp.1177-1181
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• 1995

Fixtures are devided into special purpose fixtures, modular fixtures and general purpose fixtures. In this paper, the database of modual fixtures for flexible manufacturing systems is estabilished. Modular fixtures are classified into base plates, supporting elements, locating elements, clamping elements and accessories. Also the concept for the modular fixture design expert system is proposed.

• Korean Institute of Interior Design Journal
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• v.15 no.1 s.54
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• pp.88-97
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• 2006

The purpose of this study was to provide a guideline for the bathroom fixtures of the aged by examining current status. The study has been carried out by measuring physical size of 50 aged peoples over 65 years old and their bathroom fixture status. The results were revealed as follows; 1. The height of washstand is $0.46\~0.52$ time of person's height. Adequate height of wash stand is proposed as $74\~80$ cm. The height of current market available wash stand is very close to the proposed size. 2. The height of toilet is $0.23\~0.27$ time of person's height. Adequate height of toilet is proposed as $38\~41$ cm. The height of current market available toilet is also very close to the proposed size. 3. The height of bathtub is $0.26\~0.35$ time of person's height. Adequate height of bath tub is proposed as $45\~49$ cm. The proposed height is higher than that of current bath tub available in the market. However, it should be noted that the proposed height is the sum of bath tub it self and elevation during actual installation. As stated above, it is revealed that the physical dimensions of the bathroom fixtures in the current market are properly sized. However, to draw more practical guideline for the bathroom fixture, more studies including actual experimentation will be required in the future.

• Journal of The Korea Institute of Healthcare Architecture
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• v.23 no.3
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• pp.29-37
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• 2017

Purpose : Due to the shortage of the room for the disabled, it may be difficult to use the accommodation for the disabled (especially wheelchair users). The purpose of this paper is to propose a universal design(UD) application for all rooms to solve the problems caused by the shortage and the decrease of the usage rate of the rooms for the disabled. Methods : Classify and analyze the type of room and bathroom according to the survey. The space of the room is classified into six types mainly based on the relation and location among the entrance, the bathroom, and the bedroom. Also, the bathroom is classified into 20 types considering the positional relationship with the entrance and between sanitary fixture. By using these types, FGI survey will be conducted and the application of UD will be reviewed and presented. Results : We analyzed by using the types of the room and the bathroom. One of majority type in the actual research and two of UD applicable types from FGI, are shown UD application. In addition, the bathroom were analyzed about four types from FGI. The room were shown about the activity space and the furniture layout for UD. The bathroom were shown about the space for the entrance, the internal activitiy space and the arrangement of the sanitary fixture. Implications : By comparing and analyzing through type classification, it was found that universal design can be applied to all rooms. Therefore, it is expected that the UD will be activated in all rooms of the accommodation.

• Korean Journal of Computational Design and Engineering
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• v.8 no.3
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• pp.189-200
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• 2003

This paper introduces the development of a three-dimensional jig design system for automotive body welding assembly. Recently, three-dimensional CAD systems have been introduced in the jig design area, because they reduce errors in design process and the design result can be used readily for virtual manufacturing simulation. However, to facilitate three-dimensional jig design, it is essential to customize three-dimensional CAD system for this specific design area. To accomplish this object, we first standardized the parts and units in a jig assembly, and then built the standard part library. We also developed the dedicated 3D design capabilities of jig units and a jig base. By using this system, design can be performed more intuitively, and verification and simulation of design results can be done more easily. The proposed system has been implemented using the UG/Open API of the Unigraphics system.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2003.06a
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• pp.1475-1478
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• 2003

This paper introduces the development of design capabilities for air cylinders and jig bases in a three-dimensional jig design system for automobile body assembly. We first built the standard part library for these parts, and then developed the dedicated 3D design capabilities based on the Unigraphics system. By using this 3-D jig design system, design can be performed more intuitively, and verification and simulation of design results can be done more easily as the 3-D design result can be used readily for virtual manufacturing simulation.

• Journal of Periodontal and Implant Science
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• v.41 no.5
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• pp.211-217
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• 2011

Purpose: The marginal bone levels around implants following restoration are used as a reference for evaluating implant success and survival. Two design concepts that can reduce crestal bone resorption are the microthread and platform-switching concepts. The aims of this study were to analyze the placement of microthreaded and platform-switched implants and their short-term survival rate, as well as the level of bone around the implants. Methods: The subjects of this study were 27 patients (79 implants) undergoing treatment with microthreaded and platform-switched implants between October 2008 and July 2009 in the Dental Hospital of Yonsei University Department of Periodon-tology. The patients received follow-up care more than 6 months after the final setting of the prosthesis, at which time periapical radiographs were taken. The marginal bone level was measured from the reference point to the lowest observed point of contact between the marginal bone and the fixture. Comparisons were made between radiographs taken at the time of fixture installation and those taken at the follow-up visit. Results: During the study period (average of 11.8 months after fixture installation and 7.4 months after the prosthesis delivery), the short-term survival rate of microthreaded and platform-switched implants was 100% and the marginal bone loss around implants was $0.16{\pm}0.08$ mm, the latter of which is lower than the previously reported values. Conclusions: This short-term clinical study has demonstrated the successful survival rates of a microthread and platform-switched implant system, and that this system is associated with reduced marginal bone loss.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 1997.11a
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• pp.33-34
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• 1997

장비나 부품이 비행 또는 수송 등 실제상황에서 겪게되는 진동환경에 얼마만큼 견디는지 여부를 확인하고, 예상되는 동적 하중에 의한 성능저하나 오 동작이 일어나지 알는지 확인하기 위해 환경진동시험(environmental vibration test)이 수행된다. 이러한 환경진동시험의 경우에는 대형(대용량)의 진동시험기(shaker 또는 exciter)가 이용되며 진동시험기로부터 에너지를 시험물에 기계적으로 전달시켜줄 수 있는 진동 시험치구(이하, "치구(fixture)")가 필요하게 된다. 따라서 치구의 설계문제가 대두되며, 환경진동시험의 성공여부를 좌우하는데 대단히 중요한 역할을 하게 된다. 치구의 설계시 가장 중요한 점은 시험규격에 정해진 기준스펙트럼(specified reference spectrum)이 치구 위에 설치될 여러 시험물부착점들에 그대로 전달될 수 있는 강체치구(rigid fixture)를 설계하는 것이 가장 이상적이지만 치구의 공진 및 반공진 특성으로 인해 시험물부착점들 마다 스펙트럼이 달라지게 된다. 따라서 시험물은 과대시험(overtest) 또는/그리고 과소시험(undertest)를 겪게된다.최근의 진동시험제어 기법으로서는 다채널시스템을 이용한 여러 시험부착점들에서의 진동레벨의 평균을 제어하는 평균제어기법(average control technique)이 이용되므로서 시험주파수 범위에서 공진진동수(resonance frequency)들은 기준스펙트럼과 동일하게 제어가 가능하나 반공진 진동수(antiresonance frequency)들에서는 반공진 진동수들이 갖는 물리적 특성으로 인해 기준스펙트럼과 동일하게 제어가 이루어지지 않으므로시험규격에 정해진 정확한 진동시험이 수행되지 못하게된다.본 연구에서는 치구의 설계단계에서 치구 위의 여러 시험물 부착점들- 평균제어점(average control points)- 에서의 반공진 진동수들을 고려하여 그 감도를 게산하고, 치구의 구조변경을 수행하여 시험물 부착점들에서의 반공진 진동수를 일치시키므로서 종래의 진동시험제어시 나타나는 반공진진동수에서의 문제점을 제거할 수 있고, 그 결과 시험물 부착점들에서의 스펙트럼이 시험규격에 정해진 스펙트럼대로 진동시험이 수행될 수 있게 하는데 있다.

• Korean Institute of Interior Design Journal
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• no.13
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• pp.25-31
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• 1997

The purpose of this study is to provide the guideline of the interior design of Wedding halls, based on a series of investigations and analysis of the consumer's preference. Marriage is an essential ceremony of family life. However the Wedding culture has been changed since the western culture affected to traditional marriage concept. Many countries have different wedding culture and traditiov. Ours are largely divided into the traditional Korean wedding ceremony and the modern, i.e. the westerv. The customer's preference and the opinion for the Wedding hall analyzed through survey to find out the guideline for the interior desigv. The result of this research can be summarized as followings; 1) The interior design was the most influential element when choosing the wedding hall. 2) The preferred colors for the wedding hall were pink and white. 3) The preferred light fixture for the wedding hall was the chandelier. 4) The main points concerned in the guideline of interior design for the wedding hall were building facade, accessibility toward the wedding hall, parking lot, traffic circulation and etc.

• Journal of the Computational Structural Engineering Institute of Korea
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• v.22 no.1
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• pp.73-79
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• 2009

In this paper, the structural analysis and optimization of the door supporting rail structure in the header box located at the top of the aluminum passenger safety door(PSD) at the subway station, which opens and closes regularly, is performed. In case the simple fixed boundary condition is used for the bolt fixture on the supporting rail where the glass door is moving, excessive stresses are obtained. Therefore, more realistic finite element modeling of the bolts is used at the bolt fixture in the whole structure in order to obtain the more physically acceptable FEM results. As a result, fatigue life of twenty years of the structure is obtained to satisfy the design object. Also the optimal design of cross section of the rail part is performed using the response surface method and 15% of weight of the supporting rail part on the door is reduced.

• Korean Journal of Computational Design and Engineering
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• v.17 no.4
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• pp.253-261
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• 2012

In order to make dental implant surgery successful, it is important to perform proper planning for dental implant placement. In this paper, we propose a decent approach to dental implant placement planning based on geometric processing of 3D models of jawbones, a nerve curve and neighboring teeth around a missing tooth. Basically, the minimum enclosing cylinders of the neighboring teeth around the missing tooth are properly used to determine the position and direction of the implant placement. The position is computed according to the radii of the cylinders and the center points of their top faces. The direction is computed by the weighted average of the axes of the cylinders. For a cylinder whose axis passes the position along the direction, its largest radius and longest length are estimated such that it does not interfere with the neighboring teeth and the nerve curve, and they are used to select the size and type of an implant fixture. From the geometric and spatial information of the jawbones, the teeth and the fixture, we can construct the 3D model of a surgical guide stent which is crucial to perform the drilling operation with ease and accuracy. We have shown the validity of the proposed approach by performing the finite element analysis of the influence of implant placement on bone stress distribution. Adopted in 3D simulation of dental implant placement, the approach can be used to provide dental students with good educational contents. It is also expected that, with further work, the approach can be used as a useful tool to plan for dental implant surgery.