• 설비공학논문집
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• 제24권5호
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• pp.433-442
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• 2012

The influence of outdoor sky conditions on photosensor signals were examined to determine an appropriate index that is effectively used for optimum illuminance fluctuation when a daylight dimming system is used for a small office. Field measurements were conducted under various sky conditions. Results indicate that the outdoor global and vertical illuminance fluctuated within narrow ranges under clear and overcast sky conditions. The fluctuation of sky ratio under partly-cloudy sky caused wide ranges of illumnance fluctuation. A partially-shielded photosensor at backwall produced 56% of light output from fixtures controlled by a photosensor at ceiling. This implies that the photosensor at backwall does not always guarantee target illuminance due to the less output. The fluctuation of light output from fixtures were insignificant under clear and overcast sky. The fluctuation range of photosensor illuminance under partly-cloudy sky caused wide fluctuation ranges of light output. Regression result implies that the outdoor vertical illuminance was recommended for an effective index that is used for control of light output.

• 구강회복응용과학지
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• 제17권3호
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• pp.205-211
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• 2001

The aim of this investigation was to evaluate successfully functioning implants stability in the partially edentulous mandibular molar sites by resonance frequency measurements. Resonance frequency measurement is more objective and clinically non-invasive method than any other methods had been used. In this study, $Osstell^{TM}$ (Integration Diagnostics, Sweden) was used. 15 patients ( 7 males, 8 females ) were received each 2 implants in their mandibular unilaterally partial edentulous molar sites. Total 30 implants were installed, 28 implants were $Br{\aa}nemark^{(R)}$ self-tapping fixtures(MK II, Nobel Biocare, Sweden) and 2 were $3i^{(R)}$(USA) self-tapping fixtures. Minimum of functional loading durations was 12 months and there were no significant marginal bone resorptions and peri-implant problems. From this test, the following results were drawn: 1. Mean ISQ values of implants in the first and second mandibular molar area were $73.66{\pm}4.45$, $71.93{\pm}3.41$, respectively. There was no significant difference between two groups(p>0.05). Also mean ISQ value of total sum was 72.8. 2. Mean ISQ values of implants in males and females group were $71.64{\pm}4.06$, $73.81{\pm}3.76$, respectively. And there was no significant difference between two group(p>0.05). 3. Correlation between implant lengths and ISQ values was weak(r=0.128).

• 제어로봇시스템학회논문지
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• 제9권5호
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• pp.398-406
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• 2003

In modular fixturing systems, a given part or a subassembly is fixed by placing fixture elements such as locators and clamps adequately on a plate with a lattice of holes. It is known that the minimal number of point contacts to restrict translational and rotational motions on a plane is four and the type of three locators and a clamp(3L/1C) is the minimal future. Brost and Goldberg developed the complete algorithm to automatically synthesize 3L/1C types of fixtures which satisfy the condition of form closure. Due to the nature of the fixture, the clearance between the fixture and the part is extremely small. It is hard to load the part repeatedly and accurately for human as well as for robot. However the condition of loadability has not been taken into account in the B&G algorithm. In this paper, a new method to decide a given fixture to be loadable by using configuration space is proposed. A method to plan for a part to be loaded by using compliance safely even in the presence of control and sensing uncertainty is proposed is well.

• 대한치과보철학회지
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• 제53권1호
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• pp.81-85
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• 2015

본 증례의 환자는 상악 전치부 보철물의 파절 및 기존에 사용하던 하악 의치의 불편감 때문에 임플란트를 이용한 고정성 보철을 원한다는 주소로 내원하였다. 상악동 거상술, 하악지 골이식과 함께 상악에 5개, 하악에 6개의 임플란트를 식립하였다. 전치부와 양쪽 구치부의 세 부분으로 나누어 임플란트 지지형 고정성 보철물을 장착하였다. 이상과 같은 과정을 통해 적절한 심미적, 기능적 결과를 얻었기에 이를 보고하고자 한다.

• 한국전기전자재료학회논문지
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• 제27권9호
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• pp.606-611
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• 2014

Recently, LED lighting fixtures for crosswalk become popular in order to recognize the pedestrians at crosswalk, which can enhance the safety of the pedestrian at crosswalk. However, there are several problems related to the LED lighting fixtures for crosswalk, such as a lot of energy consumption due to a constant illumination during night and glaring of pedestrians at the opposite side of crosswalk. In this study, in order to overcome these problems, we have investigated a novel LED lighting fixture for crosswalk, which has two modules with different angles ($60^{\circ}$, $120^{\circ}$). Illuminance of min and max at four-line city street crosswalk shown 50 Lux, 125 Lux, respectively. Illuminance of min and max at eight-line city street crosswalk shown 150 Lux, 200 Lux, respectively. Simulation investigation was optimized design using optical program. Prototype was verified measurement by goniometer system.

• 한국실내디자인학회논문집
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• 제34호
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• pp.132-139
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• 2002

The purpose of this study was to search the possibility to utilize materials in creative designs through examining the relationship between design materials and form by analyzing form by materials in the process of designing. In order to achieve this purpose, the objects to analyze designs were limited to chairs and lighting fixtures, and the period of analysis was also limited on 20th century. In this study, it was understood that changes of design materials and forms characterized by years. The period, when materials were used, was similar by design items, but the forms were different though they were same materials, and the same combinations of materials also changed whole forms. Also, it was found that design materials were affecting the change of forms if it is considered that whenever design materials were characteristically changed, forms were also peculiarly changed. Therefore, the result of this study might be utilized more effectively by design items and by structural elements even in each items, are arranged, connecting them with the trend of design.

• 조명전기설비학회논문지
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• 제16권2호
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• pp.26-37
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• 2002

경관조명은 야간의 도시를 더욱 쾌적하고, 안전하며, 여유있는 활동을 보장할 수 있어 그 중요성이 더욱 강조되고 있다. 본 연구는 한강의 대표적 경관계획요소인 한강의 시민공원들을 조명계획 함으로써 도시미관을 향상시키는 데 그 목적이 있다. 이를 위하여, 선택되어진 시민공원들을 대상으로 현장조사가 이루어졌으며, 조도는 Topcon-IM5를 이용하여 측정하여 기준 조도값과 비교하였다. 그리고 몇 몇 문제점에 대하여 토의하였다. 이러한 조사를 바탕으로, 밤 시간대에 공원의 미관과 안전을 향상시키기 위하여 새로운 조명디자인개념, 광원, 조명기구의 위치 등을 계획하고, 컴퓨터 프로그램을 활용하여 이미지 연출을 제안하였다.

• 교육시설
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• 제12권1호
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• pp.14-28
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• 2005

Functional school planning has long been considered a fundamental concept of school design. However. in planning educational facilities, it is also important to include the dimensions of comfort, convenience and healthfulness. The school lavatories and drinking fountains are one of most crucial elements for the recent changing face in healthful school design, but the number of lavatories and drinking fountains in most schools may not be sufficient to meet current needs. This study aims to suggest a guideline in designing school sanitary fixture and propose the optimal number of lavatories and drinking fountains regarded to age and sex. The survey is conducted through questionnaires collected from 998 respondents including 300 teachers In ChungNam province. Based on the results of the survey and a formulae, it is suggested that the number of lavatories be required by ratio of 30 boys per unit fixture and 22 girls per unit fixture in the elementary, middle and high school. It is also suggested that the number of drinking fountains be required by ratio of 65 students per unit fixture. The formulae proposed in this paper can be used for other plumbing fixtures required in school facilities.

• KIEAE Journal
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• 제6권1호
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• pp.3-10
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• 2006

As has been expected, economic factors are a major consideration in almost every decision in building design process. Assuming that improving a lighting system, existing or proposed, will reduce operating cost, what preliminary economic guidelines can be established to determine whether any proposed investment appears cost effective? In such a case a reasonable technique to compare system costs is by life-cycle costing. Stated simply, a life-cycle cost represents the total cost of a system over its entire life cycle, that is, the sum of first cost and all future costs. This paper aims to exemplify the benefit of daylighting in term of economic consideration. Four different electric lighting system designs are proposed and a lighting control system that is continuously operating according to the level of daylight in the space has been adapted. The accumulated performance of electric and daylighting is figured out to declare the effective depth of daylight in the space. The analysis on the saving amount of lighting energy due to daylight has been undertaken in answer to the question, that is, several projects are being considered, which is the most desirable from the cost-effectiveness viewpoint. The result shows clearly that although denser layout of lighting fixtures might be more effective to interface to the level of daylight ceaselessly changeable, its economic benefit may not meet the expected criterion the reason of increased initial investment and maintenance cost for the fixtures and control hardware.

• 한국실내디자인학회논문집
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• 제13권6호
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• pp.82-90
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• 2004

The purpose of this study is to investigate the remodeling of apartments housing unit according to the area type and size in order to provide useful information for future plans for more consumer-friendly dwelling units. To achieve this goal quantitative data analyses were employed. The sample was a total of 100 apartments analysed in previous researches conducting case studies on apartments remodeling. The data were analyzed by SPSS WIN program package in terms of frequency, percentage, and x2-test. The results of the study are as follows: The change of finishing materials were made in almost all of the sample. 6.4, 8.6 and 10.6 categories were altered in the small, medium, and large apartments respectively out of 21 remodeling categories. In the case of communal areas, change of finishing materials and installation, removal, and change of lighting fixtures were most frequent. The most frequent alteration in private areas was also observed In change of finishing materials and installation, removal and change of lighting fixtures.