• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1995년도 추계학술대회 논문집
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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.

• 한국자기학회지
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• 제5권5호
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• pp.833-836
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• 1995

A capacitor discharge impulse magnetizer is used to produce a high current pulse of short duration in a magnetizing fixture for magnets of the various shapes. The problem of designing custom fixtures for magnetization has often been considered more of conventional experience than a scientific theory. Therefore, the design of magnetizingfixture has until recently been a "cut and try" process. It was common to literally blow up one or more fixtures beforeachieving the desired results. Finite element CAD package allow the design of such a fixture. Since magnetizing fixtures come in a variety of sizes and shapes, there is usually no simple analysis method that can be used to estimate the field characteristics of the fixtures. Instead, one typically uses finite element analysis. FEA program MAXWELL is the primary tool used here. The purpose of this study was a examine both theoretically and experimentally the field characteristics inside the fixture. Independent of sizes and shapes of magnetizing fixtures, the desired magnetic field can be obtained with resonable predictability. The experimental results have been achieved using a 1000[V], 22.4[KJ] capacitor discharge magnetizer and iron-core fixtures.

• 한국실내디자인학회논문집
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• 제26권5호
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• pp.34-41
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• 2017

It is necessary to conduct a basic research on fusion of ighting design or lighting environment to improve the health and quality of life of elderly people. The purpose of this study is to analyze the lighting situation of elderly people 's residential facilities in terms of space environment design plan and to analyze the trends in smart home, design and technology. It is to provide basic data for the prototype of lighting fixtures for elderly people living facilities considering functional, physiological and emotional characteristics. For the study, the target sites were selected and the results of the illumination survey of the target facilities were divided into two types of spaces, residential and other public spaces, and their location, lighting fixtures' type, color temperature, illuminance. The results of the survey showed that the overall physical illumination compared to the recommended illuminance for the elderly satisfied the recommended range and provided the appropriate brightness for the elderly. However, in the application layout of the lighting fixtures, a monotonous arrangement and a lighting fixtures type consisting entirely of simple square type fixtures and downlight types were applied. It would be desirable to use different types of lighting fixtures in the design for various functions, such as making the environment more comfortable. Future research will propose a prototype for the design direction of the subdivided lighting fixtures that classify the space according to functions and understand the vision problem of the elderly while aesthetically.

• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 2004년도 학술대회 논문집
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• pp.79-83
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• 2004

The street lighting needs to provide safe and comfortable environment together with producing good atmosphere suitable for the pedestrian's various needs. Thus, the choice of the street lighting fixtures should be based on the needs of the them and the necessities of the street rather than the precedences or appearances. This study proposes street lighting fixtures based on the need of the street lighting and also analyzes the problems of current fixtures.

• 대한물리의학회지
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• 제11권3호
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• pp.41-47
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• 2016

PURPOSE: Forward head posture (FHP) is one of the most common postural problems among white-collar workers who perform highly repetitive tasks in the same position. The aim of this study was to research the effects of thoracic and lumbar support fixtures on forward head posture (FHP) during visual display terminal (VDT) work. METHODS: The subjects were 36 healthy male students with no problems in their medical history or respiratory systems. The subjects were randomly assigned to three groups: control group (n=12), thoracic support fixtures (n=12), and lumbar support fixtures (n=12). We conducted a text typing task of the same content for 20 minutes, and evaluated the angles, including the craniovertebra angle (CVA), craniorotation angle (CRA) with photogrammetry. RESULTS: The thoracic and lumbar support fixture groups showed a statistically significant difference at the CVA and CRA to the control group (p<.05), and the post-hoc test showed an increase of the CVA and decrease of the CRA than the control group. However, when we compared the effects of thoracic and lumbar support fixtures on FHP, there was no significant difference in the difference in decrease of the CVA or increase of the CRA (p>.05). CONCLUSION: We determined that VDT work using thoracic and lumbar support fixtures has a positive effect on forward head posture in white-collar workers. Further studies are required to find the more effective location of support fixtures.

• 대한치과기공학회지
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• 제28권2호
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• pp.347-353
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• 2006

The Purpose of this study was to compare the distribution of implant fixtures according to length and diameter between screw-retained and cement-retained implant-supported fixed prosthesis and to asses whether prosthesis retained types affected the selection of size of implant fixtures. This study presents a follow-up 2,416 implant-supported fixed type prosthesis that have been screw retained or cemented retained for about 10 years in 14 dental clinics. Included in the study were 458 men and 397 women and implant fixtures used in this study were screw retained type 1,057 and 1,359 of cemented retained type. The statistical results among the diameter types of fixture by prosthesis retained type was no significant difference noted (P= 0.809) and there was significant differences was enough to among the lengths of fixture by prosthesis retained type (P= 0.020). However there were no significant difference among the fixture diameter types and length by prosthesis retained type (P= 0.486). So there was not affected to prostheis fixation mechanism for the size of implant fixtures.

• 한국산학기술학회논문지
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• 제13권8호
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• pp.3334-3338
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• 2012

본 연구는 프로펠러 주조시 사용되는 지그를 개선하기 위하여 수행된 것으로, 주조시 주형을 지지하는 강관 지그에 발생하는 응력을 실험적, 해석적인 방법을 사용하여 평가한 결과 주형의 높이방향 변형을 방지하기 위하여 사용된 수직 지그는 작용하는 응력수준이 낮고 주형 상부 지지대에 추가적으로 하중을 가하고 있기 때문에 주형에 적용할 필요가 없다. 또한 주형의 회전을 방지하기 위하여 수평방향으로 설치한 측면 강관 지그도 작용하는 응력수준이 낮아 부착할 필요가 없으며, 주형 모서리 부분에 설치한 강관 지그는 압축력이 크게 작용하는 상부 주형 강관 지그를 제외하고 하부 주형에 설치된 강관 지그는 적용할 필요가 없다는 것을 알 수 있다.

• 한국디자인학회:학술대회논문집
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• 한국디자인학회 2002년도 봄 학술발표회 논문집
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• pp.196-197
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• 2002

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• 제29권1호
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• pp.14-25
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• 2003

The purpose of this study was to analyze the stress pattern in different bone densities surrounding fin-type implant fixtures under the vertical and inclined loads ($30^{\circ}) of 200N. Von-Mises stress, the pricipal stress, and the displacement on the implant fixtures under the loads were calculated by using the finite element method. Four different types of bicon implant fixture were used for this study. The geometries of implant fixtures to develop the model were used by a sales brochure and profile project. Three-dimensional finite element model of the mandible was developed with 6.0 mm implant in diameter wurrounded by approximately 2.5 mm of bone. Bone densities were classified according to the elastic modulus of the tree. The finite element program MSC PATRAN (MSC, Software Corp., USA) were used for analysis of stress distribution. The value of the Von-Mises stress, the pricipal stress, and the displacement on the implant fixtures under the vertical and inclined loads were decreased when the diameter of implant fixture was increased, and increased when the elastic modulus was decreased. The stress on implant fixture under the vertical and inclined loads was distributed through the length of implant fixtures in D3 and D4. The distribution of stress was influenced by the direction of loads. In the wide diameter of implants, the stress was developed at outer surface of bone. In conclusion, this study suggest that stress developing on the peri-implant tissues might be influenced by the dimension of implant, elastic modulus of bone, and direction of loads.

• 대한치과보철학회지
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• 제32권2호
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• pp.327-353
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• 1994

This study was performed to evaluate the effects of number and alignment of implant fixture and various bar designs on the retention of denture and the stress distribution. Six kinds of photoelastic mandibular models and nine kinds of overdenture specimens were designed. A unilateral vertical load was gradually applied on the right first molar to calculate the maximal dislodgement load of each specimen. A unilateral vertical load of 17 Kgf was applied on the right first molar and a vertical load of 10 Kgf was applied on the interincisal edge region. The stress pattern which developed in each photoelastic model was analyzed by the reflection polariscope. The results obtained were as follows: 1. The maximal dislodgement load reversely increased with the distance from the loading point to the implant fixture, while it linearly increased with that from the most posterior implant fixture to the mesial clip. The maximal dislodgement load also increased with the use of a cantilever bar. 2. Under the posterior vertical load, the stress to the supporting tissue of the denture base increased with the distance from the loading point to the implant future. The stress concentration on the apical area of the implant future reversely increased with the distance from the loading point to the implant future. 3. In the overdentures supported by two implant fixtures under the posterior vertical load. the specimen implanted on lateral incisor areas with a cantilever bar exhibited more favorable stress distribution than that without a cantilever bar. The specimen implanted on the canine areas without a cantilever bar, however, exhibited more favorable stress distribution. 4. In the overdentures supported by three implant fixtures. the specimen implanted ell the midline and canine areas exhibited more favorable stress distribution than that implanted oil the midline and the first premolar areas. 5. In the overdentures supported by four implant fixtures. the specimen implanted with two adjacent implant fixtures exhibited more favorable stress distribution than that implanted at equal distance under the posterior vertical load. 6. Under the anterior vertical load, the overdentures supported by three implant fixtures exhibited stress concentration on the supporting structure of the middle implant future. In overdentures supported by two or four implant futures, no significant difference was noted in stress distribution between the types of bars. These results indicate that the greater the number of implant fixtures, the better the stress distribution is. A favorable stress distribution may be obtained in the overdentures supported by two or three implant fixtures, if the location and the design of the bar are appropriate.