• 전자공학회논문지
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• 제54권4호
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• pp.108-112
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• 2017

고 휘도 방전 램프는 높은 광 효율이 요구되는 다양한 조명 환경에 많이 사용된다. 특히 메탈할라이드 램프용 조명 램프의 경우 램프 안정기의 크기는 매우 중요한 요소이며 작으면 작을수록 좋다. 메탈할라이드 램프용 전자식 안정기는 전자기식 안정기에 비하여 에너지 효율과 크기 그리고 조명기의 무게 등의 측면에서 성능이 우수하다. 본 논문에서는 DSP를 이용하여 고효율, 소형 및 경량화가 가능하고 비용이 절감되고 역률이 높은 전자식 안정기를 제시하였다. 제시한 전자식 안정기는 다이오드 정류기와 역률 보상 제어 부스트 컨버터 그리고 하프 브릿지 인버터로 구성하였고 역율 보상 알고리즘과 안정기 제어 알고리즘은 TI사의 TMS320LF2406 CPU를 사용하여 구현하였고 실험을 통해 제시한 안정기의 유용성과 타당성을 검증하였다.

• 대한통합의학회지
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• 제9권3호
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• pp.175-183
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• 2021

Purpose : Few studies have examined the relationship between elderly falls and quality of life (QOL) in a large general population. Furthermore, although many studies have investigated the relationships between socio-demographic factors and falls, relatively few studies have evaluated the associations of places and environments with QOL of fall. The purpose of the scheme was to identify the relationship between falls and QOL in a large sample of the elderly. Methods : This study used raw data from the 2013 Korean community health survey. A total of 228,781 people participated in the 2013 study among them 61.552 people were aged 65 or older. Authors also excluded 40 people whose QOL confirmation was unclear. Therefore, final analysis was conducted 61,512 senior citizens. The survey contained questions about the occurrence of falls, number of falls occurring per year, location of occurrence, and cause of falls. QOL was measured using the EQ-5D, an evaluation tool developed by the EuroQol group. Results : The results showed a statistically significantly lower QOL to little fear and full of fear as compared with no fear of falls (p<.05). The number of falls was statistically significantly lower in one, two, and three or more times, than in zero (i.e. no falls)(p<.05). In the falling environments, fall experience, but not related to lighting (p>.05), had a significant lower in QOL compared without the experience (p<.05). Conclusion : This study concluded that there is a strong connection between fall and QOL to the elderly, particularly regarding the number of occurrences, place, and environment. However, we found that an environment (e.g. the lack of lighting) might not affect QOL. It means that when the experts who make an effective tool or intervention may not need to consider indoor and outdoor darkness.

• 한국건축시공학회지
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• 제23권5호
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• pp.629-638
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• 2023

본 논문에서는 건설현장 작업자의 실내 위치 추적을 위한 새로운 방법을 소개한다. 전통적으로 GPS및 NTRIP과 같은 기술은 주로 야외에서 효과적인 위치 확인을 제공하는 데 사용되었습니다. 그러나 이러한 기술은 실내에서 사용할 경우 정확도가 떨어지는 문제가 있습니다. 이러한 문제를 해결하기 위해 본 논문에서는 Aruco marker를 활용하여 작업자의 위치를 추적하는 방법을 제안한다. Aruco marker는 작업자와 마커 사이의 거리를 측정하는 데 사용됩니다. 이 새로운 접근 방식은 기존 위치 확인 방법에 비해 더욱 정확한 실내 위치 확인을 제공합니다. 작업자 위치를 실시간으로 확인할 수 있어 작업 일정을 최적화하고 작업자 간 협업을 촉진합니다. 따라서 Aruco marker를 활용한 실내 측위 방식은 기존의 기술의 문제점을 보완하는 실내 위치 확인 시스템으로 활용될 수 있다.

• 제어로봇시스템학회논문지
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• 제13권2호
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• pp.86-92
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• 2007

This paper presents the development of fire-fighting and rescue robot for Outdoor Environment. In the procedure of this development, we follow Target Oriented Design (TOD) which is recognized as the systematic methodology to design a system by specifying the target clearly. For some real fire fighting tasks (e.g. tasks in shopping street and a market), narrow road make it difficult for existing fire engine to access the firing place. On the other hand, for dangerous tasks (e.g. gasoline station and a storehouse) the explosive materials make it impossible for fire-fighters to access the firing place. Moreover, the smoke and the high-temperature caused by fire make fire fighting difficult. In this situation, the solution is to develop the fire-fighting and rescue robot. TOD is performed firstly by analyzing the environment properties of fro place and the demanded tasks and the fire-fighting and rescue robot is manufactured. For safety, the fire fighting robot should be controlled by remote operation to keep the operator away from the fire, and the control system is divided into three parts: the robot controllers, controller for remote operating device and wireless communication system. We have selected and developed appropriate hardware and software for each part of control system with considering TOD. As a result, the fire-fighting robot functions correctly and the performance and usefulness of our control architecture is validated by successfully performing some fire-fighting tasks.

• 한국조경학회지
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• 제25권2호
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• pp.104.1-104.1
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• 1997

The purpose of this study is to grasp the characteristics of user''''s response to perceived safety and visual preferences for outdoor green spaces by the types of campus layouts. This research was investigated by color slide ratings and questionnaire survey to the students who are majoring in Landscape architecture in three universities locating at Taegu area. Two research sites have similarities in many ways but have differences in campus land form and design type such as ''''Closed'''' and ''''Open'''' types. Major results were summarised as follows ; 1. As a result of the slide test, the high degree of visual preference was shown in the campus that is ''''Closed'''' type. However the degree of perceived safety was lower than that of in Youngnam Univ. campus. 2. According to the result of the comparative analysis between user''''s perceived safety and visual preferences in each campus, the degree of perceived safety at ''''Closed'''' type was lower than that of ''''Open'''' type, but the degree of visual satisfactioni was higher at ''''Closed'''' type. 3. The factors affecting visual preference in campus were shown as density of wood, land form, and diverse type of the spaces. On the other hand, the factors affecting perceived safety were ''''enclosed space by wood'''' at the day time, and ''''the condition of lighting'''' at night. 4. Regarding gender differences in sensation of each space variables, female users showed higher satisfactio on the scenic beauty. 5. Regression analysis showed that general satisfation was determined by the variables such as ''''arrangement'''', familiarity'''', ''''cleanness'''', and ''''closed feeling'''', in Kyungbook Univ. And in Youngnam Univ. , the variables were ''''texture'''', ''''perceived beauty'''', ''''cleanness'''', and ''''complexity'''' respectively. 6. In conclusion, campus users wanted the outdoor spaces that have various land form and somewhat ''''open-closed'''' mixture type, which has a good ''''Edge Effect'''' to satisfy both aspects in safety and visual preferneces.

• 한국조경학회지
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• 제25권2호
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• pp.104-116
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• 1997

The purpose of this study is to grasp the characteristics of user's response to perceived safety and visual preferences for outdoor green spaces by the types of campus layouts. This research was investigated by color slide ratings and questionnaire survey to the students who are majoring in Landscape architecture in three universities locating at Taegu area. Two research sites have similarities in many ways but have differences in campus land form and design type such as 'Closed' and 'Open' types. Major results were summarised as follows ; 1. As a result of the slide test, the high degree of visual preference was shown in the campus that is 'Closed' type. However the degree of perceived safety was lower than that of in Youngnam Univ. campus. 2. According to the result of the comparative analysis between user's perceived safety and visual preferences in each campus, the degree of perceived safety at 'Closed' type was lower than that of 'Open' type, but the degree of visual satisfactioni was higher at 'Closed' type. 3. The factors affecting visual preference in campus were shown as density of wood, land form, and diverse type of the spaces. On the other hand, the factors affecting perceived safety were 'enclosed space by wood' at the day time, and 'the condition of lighting' at night. 4. Regarding gender differences in sensation of each space variables, female users showed higher satisfactio on the scenic beauty. 5. Regression analysis showed that general satisfation was determined by the variables such as 'arrangement', familiarity', 'cleanness', and 'closed feeling', in Kyungbook Univ. And in Youngnam Univ. , the variables were 'texture', 'perceived beauty', 'cleanness', and 'complexity' respectively. 6. In conclusion, campus users wanted the outdoor spaces that have various land form and somewhat 'open-closed' mixture type, which has a good 'Edge Effect' to satisfy both aspects in safety and visual preferneces.

• 한국조경학회지
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• 제39권4호
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• pp.39-48
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• 2011

한국은 빠르게 고령화사회로 접어들고 있다. 이러한 시점에서 본 연구의 목적은 예비고령자들의 현 주거지의 외부환경 이용실태를 조사하고, 고령자 친화형 외부공간에 주요한 요소들을 파악하여 이들의 평가를 통해 고령자의 건강한 생활을 위한 환경요소를 파악하여 개선점을 제시하는데 있다. 연구 방법으로서 먼저 기존 선례와 관련연구의 조사를 통한 이론적 토대를 마련하고, 실증연구로서 대전에 거주하고 있는 준고령자 이상 주민의 외부환경 이용실태와 만족도에 대해 설문조사를 병행하였다. 본 연구의 결과로서 전반적으로 현 거주지의 외부환경이 큰 문제가 없이 중간 수준의 평가를 받고 있었지만, 평가요소들중 비교적 저평가된 요소들은 고령자 친화형 공간요소로 개선이 필요되어져야 할 것이다. 첫째, 산책하기 위해서 '산책길의 이용'이 가장 높았고, 한번에 1~2시간동안 외부에 머무르며, 주차된 차량이 많음이 가장 불편한 사항이었다. 둘째, 외부환경은 '보통'으로 평가되었으며, '사회성'이 기장 낮게 평가되었다. 셋째, '카트/휠체어 이용편리성', '조명에 의한 야간 식별성', '야간의 안내판 식별성'. '나무 화초 쾌적성'의 4 개 항목에서 남자가 여자보다 불만족하고 있었다. 66세 이상의 응답자들이 '바닥의 미끄러움', '계단난간', '야간의 안내판 식별성', '단지배치의 방향성' 항목에서 더 불만족하고 있었으며, '바닥 미끄러움', '야간의 안내판 식별성'의 두 개 항목에서는 80대 이상의 응답자들이 더 불만족하고 있었다. 넷째, 현 거주지 유형에 따른 평가는 22개 중 20개 항목에서 유의미한 차이가 나타나는 바, 아파트 거주자의 평가가 더 높게 나왔다. 전반적으로 현거주지 주변환경에 있어 고령자들의 입장에서 크게 문제로 대두된 것은 없다고 평가되었다. 그러나 향후 10년 내에 고령화가 더욱 진행된다고 가정할 때, 기술통계에서 낮은 점수를 받은 항목과 80세 이상의 고령자들에게 특히 불편을 야기하고 있는 낮은 평가항목에 대하여 주거환경 개선이 우선적으로 요구된다.

• 한국주거학회논문집
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• 제17권4호
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• pp.1-13
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• 2006

The purpose of the study was to identify the level of housing choice behavior by using the factors of residential satisfaction level, mobility motivation, and housing needs of potential purchasers in Bukgu New Housing Area, Ulsan. The survey used questionnaire from 326 households living in Bukgu and nearby area and analyzed using descriptive statistics. The research results showed low degree of residential satisfaction in storage space and neighborhood. The mobility motivations were improvement of physical environment improvement, education environment, walking road, view and lighting. The housing needs for indoor spaces showed to want more functional arrangement than the room size. The housing needs for outdoor spaces showed to want neighborhood environment in connection with the education or hospital facilities, the welfare facilities for pre-kindergarten children and elders and the leisure facilities. And the housing needs for facilities were floor furnishing for health, crime prevention system for safety needs, housekeeping appliance against environmental pollution, additional function for energy saving. The housing needs for common spaces showed that the residents preferred playing facilities by age group, exercise facilities, the community hall and the rest room which can do games or meetings.

• KIEAE Journal
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• 제12권5호
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• pp.77-84
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• 2012

Daylighting is the controlled admission of natural light into a space, reducing electric lighting and saving energy. By providing a direct link to the dynamic and perpetually evolving patterns of outdoor illumination, daylighting helps create a visually stimulating and comfort environment for building occupants, while reducing energy costs. Especially, however, glare is the most important factor in daylighting, which is issued by incoming direct sunlight into windows. This study analyzed the discomfort glare on a daylighting window by using Image processing methodology and found a solution to problems with glare source of occupants. There are several ways to evaluate discomfort glare such as UGR (Unified Glare Rating) of CIE, DGI (Daylight Glare Index, Hopkinson, 1972) and VCP (Visual Comfort Probability) of IES. These are used to apply to the relatively little artificial light source and they cannot cover discomfort glare from a real daylighting window. In this regarding, this paper aimed to calculate DGI index of the real daylighting window in a experimental space by using image processing methodology. The variables and outcomes are luminance distribution of non-shading window, effect of venetian blind installed on the window and locations related to position index of DGI.

• 한국CDE학회논문집
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• 제11권2호
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• pp.128-137
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• 2006

In this paper, a CAD/CAE integrated optimal design system is developed, in which design and analysis process is automated using CAD/CAE softwares for a complex model in which the modeling by parametric feature is not easy to apply. Unigraphics is used for CAD modeling, in which the process is automated by using UG/Knowledge Fusion for modeling itself and UG/Open API function for the other functions respectively. Structural analyses are also carried out automatically by ANSYS using the imported parasolid model. The developed system is applied for the PLS(Plasma Lighting System) consisting of more than 20 components, which is a next generation illumination system that is used to illuminate stadium or outdoor advertizing panel. The analyses include responses by static, wind and impact loads. As a result of analyses, tilt assembly, which is a link between upper and lower body, is found to be the most critical component bearing higher stresses. Experiment is conducted using MTS to validate the analysis result. Optimization is carried out using the software Visual DOC for the tilt assembly to minimize material volume while maintaining allowable stress level. As a result of optimization, the maximum stress is reduced by 57% from the existing design, though the material volume has increased by 21%.