• 제목/요약/키워드: Area Light

검색결과 2,877건 처리시간 0.033초

자동차회사 근로자를 대상으로 한 근골격계 자각증상과 moire 영상 진단과의 관계 연구 (Research on the Relation between Musculoskeletal symptoms and Diagnosis using Moire Topography among Workers at an Automobile Manufacturing Plant)

  • 천은주;이영길;장두섭;이기남;송용선
    • 대한예방한의학회지
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    • 제5권2호
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    • pp.69-92
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    • 2001
  • The purposes of this study were to offer foundation making more certain standards of musculoskeletal disorder diagnosis, We researched musculoskeletal symptoms degrees, frequencies, and cares and then examined relation between musculoskeletal symptoms and diagnosis of musculoskeletal conditions using moire topography among workers at an automobile manufacturing plant. Therefore we propose the possibility of moire topography as diagnosing utilities of musculoskeletal disorders. Methods: This study was to examine the general characteristics, complaints of musculoskeletal symptoms, and work-related musculoskeletal disorder rates of cervicobrachial and lumbar area by survey among 435 workers at an automobile manufacturing plant and then to show each frequency and percentage, In the diagnosis using moire topography, we studied pain control necessity of cervicobrachial and lumbar area, 435 subjects were classified by 5 levels: A(no symptoms), B(need management), C(need treatment) and then more divided by B1(light symptoms)/B2(heavy symptoms), C1(light symptoms)/C2(heavy symptoms), And musculoskeletal areas were divided by 2 parts, cervicobrachial area(neck, shoulder, arm&elbow, and wrist&hand) and lumbar area, Then, frequency and percentage of each musculoskeletal areas(cervicobrachial and lumbar area) were appeared. At last, Pearson's chi-square test analysis was utilized to observe the relation between diagnosis using moire topography and general characteristics and the relation between diagnosis using moire topography and work-related complaint of musculoskeletal symptoms of cervicobrachial and lumbar area, Results: The subjects employed for this research were categorized into; by gender, all of them were males(l00%): by age, under 35 years 12 %, 36-40 years 56.3%, 41-45 years 26.3 %, and above 46 years 5.3% with 36-40 years accounting for most of it. By living location, owned houses represented 69.7%, rented houses 23.4%, monthly-rented 1.6%, the others 5.3%; by education, middle school and lower represented 3.0%, high school 89.4%, and junior college and higher 7.6% with high school occupying most of the group. By marital status, married represented 95.2%, unmarried 4.1%, and the others 0.7% with most of them married; by alcohol, drinking represented 81.8% and non-drinking 18.2%; by smoking status, smoking represented 53.6%, non-smoking 46.4% with no big difference between them. By working time(hours/week), below 50 represented 26.9%, 50-60 67.6%, above 60 5.5%; by working time(hours/day), below 9 represented 21.6%, 10-12 73.1%, above 13 5.3%; by job tenure(years), below 10 represented 25.1%, 11-15 54.3%, 16-20 15.2%, above 21 5.5%. By personal income per year, below 30 million won represented 11.0%, 30-40 84.8%, above 40 4.1%; by sleeping hours, below 6 hours represented 26.7%, 7-8 hours 69.9%, above 9 hours 3.4%. Complaint rates of musculoskeletal symptoms and work-related musculoskeletal disorder rates were 63.9% and 54.9% with shoulder area occupying most of both them. By pain degree of musculoskeletal symptoms, shoulder area represented $2.73{\pm}0.84$, lumbar area $2.66{\pm}0.86$, wrist and hand area $2.59{\pm}0.86$, neck area $2.55{\pm}0.74$, and arm and elbow area $2.48{\pm}0.71$. By cares about musculoskeletal symptoms, taking medication or care represented 34.4%-46.7%, absence or leave 15.4%-28.7%, and job transfer 6.3%-11.5%. So experienced cases more than one thing among cares about musculoskeletal symptoms represented 39.6%-54%. In the diagnosis using moire topography, pain control necessity of cervicobrachial area was shown below; A(no symptoms) 20.7%, B1(need management/light symptoms) 64.6%, B2(need management/heavy symptoms) 11.5%, C1(need treatment/light symptoms) 3.0%, C2(need treatment/heavy symptoms) 0.2%. By lumbar area, A(no symptoms) 8.7%, B1(need management/light symptoms) 52.2%, B2(need management/heavy symptoms) 30.3%, C1(need treatment/light symptoms) 8.7%, C2(need treatment/heavy symptoms) was none. In the relation between pain control necessity and general characteristics, age(P=0.013), education(P=0.000), and job tenure(P=0.012) with pain control necessity showed differences with significance. The relation between pain control necessity and complaint of musculoskeletal symptoms of cervicobrachial and lumbar area showed no difference with significance; in cervicobrachial area represented P=0.708, lumbar area P=0.318 Conclusions: This study for musculoskeletal symptoms on workers at automobile manufacturing plant showed that complaint rates of musculoskeletal symptoms for cervicobrachial and lumbar area were so high, 63.9%. But Pearson's chi-square test analysis was utilized to study the relation between musculoskeletal symptoms and the diagnosis using moire topography, showed no differences with significance. They have no differences with significance, but the prevalence rates of diagnosis using moire topography for cervicobrachial and lumbar area were more higher than complaint rates of musculoskeletal symptoms; complaint rates of musculoskeletal symptoms were 52.4%, 34.5% and the diagnosis using moire topography were 79.3%, 91.3% for cervicobrachial and lumbar area. The results of this study indicate that the diagnosis using moire topography can find weak musculoskeletal disorders that an individual can not feel, not be judged work-related musculoskeletal disease. Therefore, this study has an important meaning that diagnosis using moire topography can predict and control own physical condition complete musculoskeletal disorders beforehand, since oriental medicine theory considers that prevention is important.

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다도해해상국립공원 내 섬 지역의 빛공해 유발 요인 분석 (Analysis of Factors That Cause Light Pollution in Islands in Dadohaehaesang National Park)

  • 성찬용
    • 한국환경생태학회지
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    • 제36권4호
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    • pp.433-441
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    • 2022
  • 빛공해는 연안 및 섬 지역의 생태계를 교란하는 요인 중 하나이다. 본 연구는 야간 위성영상을 이용하여 다도해해상국립공원 내 섬 지역의 빛공해를 일으키는 요인을 분석하였다. 분석은 다도해해상국립공원 내 섬 중 면적이 10만m2 이상인 101개 섬을 대상으로 하였다. 연구 대상 섬의 빛공해 수준은 2019년 1월과 4월, 8월, 10월 DNB monthly 영상에 기록된 야간 빛방사량으로 측정하였다. 연구 대상 섬의 야간 빛방사량을 다도해해상국립공원의 7개 지구별로 비교하면, 금오도지구가 17,666nW/m2/sr로 가장 높았고, 거문도·백도지구, 나로도지구, 소안도·청산도지구가 뒤를 이었다. 계절별로는 10월의 야간 빛방사량이 9,509nW/m2/sr로 가장 높았고, 다음으로 8월, 1월, 4월 순이었다. 연구 대상 섬의 빛공해 수준에 영향을 미치는 요인을 회귀분석을 통해 분석한 결과, 섬에서 반경 5km 내 지역의 건축물 연면적과 등대 개소수는 모든 시기에서 야간 빛방사량에 통계적으로 유의미하게 영향을 미쳤지만, 섬 내부의 건축물 연면적과 등대 개소수는 대부분 시기에 영향을 미치지 않아, 개발이 제한된 국립공원 내 섬 지역에서는 공원 내부보다 인근 지역의 인공조명의 영향이 큰 것을 알 수 있었다. 단, 8월에는 예외적으로 섬 내부의 건축물 연면적이 섬의 야간 빛방사량에 유의미한 영향을 미쳤는데, 이는 휴가철 탐방객이 사용하는 인공조명의 영향으로 보인다. 섬의 크기는 섬의 빛공해 수준에 음(-)의 영향을 미쳤는데, 이는 빛공해가 일종의 생태적 경계효과임을 보여주는 결과이다. 즉, 작은 섬일수록, 섬 전체 면적 중 인접 지역에서 방사된 빛의 영향을 받는 경계 지역의 면적이 상대적으로 넓기 때문이다. 본 연구의 결과는 해상형 국립공원 내 섬 지역의 빛공해 저감을 위해서는, 섬 인근 지역의 인공조명 관리가 필요하다는 것을 시사한다.

Effect of Extreme Light Regime on Production and Characteristics of Egg in Laying Geese

  • Wang, S.D.;Wang, C.M.;Fan, Y.K.;Jan, D.F.;Chen, L.R.
    • Asian-Australasian Journal of Animal Sciences
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    • 제15권8호
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    • pp.1182-1185
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    • 2002
  • The objective of this study was to investigate the effect of long light regime (20 h light and 4 h dark, 20L:4D) and short light regime (4 h light and 20 h dark, 4L:20D) on egg production and egg characteristics of laying geese. Thirty-six laying birds, 4 replicates of 3 birds per treatment were allotted to three light regimes, i.e., 20L:4D, 4L:20D, and natural light (NAT) from March 7 to June 20. Results showed that the geese in 20L:4D consumed 54 g less feed per goose daily and laid 17.5 less eggs per goose (p<0.05) comparing to those in 4L:20D. The number of days from initiation of light treatment till cease of laying was 22 days shorter (p<0.05) in 20L:4D comparing to that in NAT. Five geese (41.7%) in 4L:20D kept laying by the end of applying light regime. Weight and surface area of the eggs in 4L:20D were greater (p<0.05) comparing to those in the other two light regimes. It is concluded that the period of egg production in goose could be manipulated by light regime in the ways such as using short light regime of 4 h light daily to prolong egg production through summer and using long light regime of 20 h light daily to induce cease of egg production.

이중 블라인드 광파이프 주광 조명시스템 효율 및 조명에너지 절감량 평가 연구 (Evaluation Study of a Double Blind Light Pipe Daylighting System Efficiency and an Illumination Energy Reduction)

  • 강은철;유성연;이의준
    • 한국태양에너지학회 논문집
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    • 제33권1호
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    • pp.89-95
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    • 2013
  • A DBLP(Double blind light pipe) daylight system can be installed at a building exterior wall or roof to replace artificial light during the day time. This system was consisted of a double blind light collector, a mirror duct type light transformer and a prism light pipe distributor. The double blinds were used to track the sun's altitude and azimuth movements to collect the sunlight throughout the day. The sunlight collected by the light collector was reflected on the first mirror and the second mirror and sent to the light pipe through the light transformer. The transformer was designed to deliver the sunlight into the light pipe efficiently. The light distributor plays a role in diffusing the sunlight coming in through the light collector to be used for indoor lighting. In this paper, a DBLP system has been designed, installed and tested at a KIER daylighting twin test cell. The DBLP daylighting system was applied to the experimental test cell which has an indoor area of 2.0 m wide ${\times}$ 2.4 m height ${\times}$ 3.8 m length. The experiment was conducted from January 30 to February 27, 2012, under clear skies and partially cloudy skies. Data was collected from 10:00 am to 16:00 pm every 2 minute and the average was calculated for every 30 minute of the data collection to obtain the system efficiency. The results indicated that the DBLP system efficiency was evaluated as 11.67%. The DBLP system indoor illumination energy reduction was predicted as 0.822 kWh/day. This could replace 4 sets of a 32W fluorescent lamp operating 6.4 hours per a day.

Automotive Adaptive Front Lighting Requiring Only On/Off Modulation of Multi-array LEDs

  • Lee, Jun Ho;Byeon, Jina;Go, Dong Jin;Park, Jong Ryul
    • Current Optics and Photonics
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    • 제1권3호
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    • pp.207-213
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    • 2017
  • The Adaptive Front-lighting System (AFS) is a part of the active safety system, providing optimized vision to the driver during night time and other poor-sight conditions of the road by automatic adaptation of lighting to environmental and traffic conditions. Basically, an AFS provides four different modes of the passing beam as designated in an United Nations Economic Commission for Europe regulation (ECE324-R123): neutral state or country light (Class C), urban light (Class V), highway light (Class E), and adverse weather light (Class W). In this paper, we first present an optics design for an AFS system capable of producing the Class C/V/E/W patterns requiring only on/off modulation of multi-array LEDs with no need for any additional mechanical components. The AFS optics consists of two separated modules, cutoff and spread; the cutoff module lights a narrow central area with high luminous intensity, satisfying the cutoff regulation, and the spread module forms a wide spread beam of low luminous intensity. Each module consists of two major parts; the first converts a discretely positioned LED array into a full-filled area emitting light source plane, and the second projects the light source plane to a 25 m away target plane. With the combination of these two optics modules, the four beam patterns are formed by simple on/off modulation of multi-array LEDs. Then we report the development of a prototype that was demonstrated to provide the four beam patterns.

Pulse 전위를 적용한 전기화학적 증착 공정으로 제조된 가시광 활성 이종접합 $CuInS_2-TiO_2$ Nanotube 화합물 광전극 (Visible Light-Driven $CuInS_2-TiO_2$ Nanotube Composite Photoelectrodes with Heterojunction Structureusing Pulsed-Electrochemical Deposition Process)

  • 윤정호;;박영구
    • 한국응용과학기술학회지
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    • 제30권1호
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    • pp.49-56
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    • 2013
  • Excellent electron transport properties with enhanced light scattering ability for light harvesting have made well-ordered one dimensional $TiO_2$ nanotube(TNT) arrays an alternative candidate over $TiO_2$ nanoparticles in the area of solar energy conversion applications. The principal drawback of TNT arrays being activated only by UV light has been addressed by coupling the TNT with secondary materials which are visible light-triggered. As well as extending the absorption region of sunlight, the introduction of these foreign components is also found to influence the charge separation and electron lifetime of TNT. In this study, a novel method to fabricate the TNT-based composite photoelectrodes employing visible responsive $CuInS_2$ (CIS) nanoparticles is presented. The developed method is a square wave pulse-assisted electrochemical deposition approach to wrap the inner and outer walls of a TNT array with CIS nanoparticles. Instead of coating as a dense compact layer of CIS by a conventional non-pulsed-electrochemical deposition method, the nanoparticles pack relatively loosely to form a rough surface which increases the surface area of the composite and results in a higher degree of light scattering within the tubular channels and hence a greater chance of absorption. The excellence coverage of CIS on the tubular $TiO_2$ allows the construction of an effective heterojunction that exhibits enhanced photoelectrochemical performance.

단거리 조사 시 넓은 면적에 균일한 조명도를 가지는 비대칭 조명 광학계 설계 연구 (Study on the Design of Asymmetric Lighting with Uniform Illumination Over a Large Area at Short Distance)

  • 강동화;정미숙
    • 한국광학회지
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    • 제31권4호
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    • pp.183-190
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    • 2020
  • 본 논문에서는 넓은 조사 면적에 단거리 조사시에도 균일한 조명도 분포를 가지도록 하는 비대칭 배광의 조명 광학계에 대한 연구를 진행하였다. 단거리에 설치되는 조명의 경우 조사 거리가 짧기 때문에 충분한 배광 분포 형성이 되지 못해 조명의 균일도를 만족하기 어렵다. 또한 시인성을 위해 조명기기가 기울어져 설치되기 때문에 비대칭 배광의 조명 설계가 요구된다. 이러한 문제점을 해결하기 위해 비대칭 배광을 가지는 조명 광학계 설계를 통해 근거리 조사 시에도 대상 표면에 균일한 조명도를 얻을 수 있었으며, 이를 근거리 조명 중 하나인 라이선스 램프에 적용하여 법규 기준을 만족하는 것을 확인하였다.

RF 네트워크 기반 보안등 양방향 제어 시스템에 관한 연구 (A Study on RF Network-Based Guard Light System with Bidirectional Control)

  • 최정원;이호근;오득환
    • 조명전기설비학회논문지
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    • 제27권1호
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    • pp.92-98
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    • 2013
  • In this paper, Completely beyond the existing conventional Guard Light management system, introduced the 447Mhz band wireless sensor network Guard Light to manage efficiently the shape of the new system is proposed. In addition, about wireless sensor network technology, control server technology, application layer protocol technology etc which is core technology for the proposed system configuration, it was verified by the design and experiment. Especially studying wireless Guard Light System(about 1,700 node configuration) commercially installed in the Daegu area as a results of the study, I would like to prove the effectiveness of the study.

공력 Buffet 하증을 고려한 헬리콥터 탐색등의 구조진동해석 (Structural Vibration Analysis of Helicopter Search Light Considering Aerodynamic Buffet Load)

  • 김요한;김동만;김동현;최희주;박용석;김종건
    • 한국소음진동공학회:학술대회논문집
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    • 한국소음진동공학회 2008년도 추계학술대회논문집
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    • pp.175-179
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    • 2008
  • In this study, computational structural vibration analysis of helicopter search light exposing unsteady buffet load have been conducted using combined advanced numerical methods. Unsteady CFD method based on Navier-Stokes equations is used to predict viscous buffet load due to flow separation effects. Full three-dimensional finite element model is constructed in order to conduct static and structural dynamic analyses of the search light model for two different typical flight speeds. Also, the correct performance of the search light can be physically estimated to examine the actual lighting area considering the effects of structural deformations.

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브로드캐스트 방법을 이용한 LED 기반 가시광 통신 시스템 (LED based Visible Light Communication System using Broadcast Method)

  • 이종성;오창헌
    • 한국정보통신학회:학술대회논문집
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    • 한국정보통신학회 2018년도 춘계학술대회
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    • pp.641-642
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    • 2018
  • LED 기반 가시광 통신은 별도의 송수신 장비가 필요하고 광원의 범위에서만 통신이 가능한 특징이 있다. 또한 가시광 대역을 사용하여 주파수에 민감한 지역에서 사용이 가능한 장점이 있다. 이러한 장점과 특징을 응용하여 다양한 분야에 적용하기 위한 연구가 필요하다. 본 논문에서는 브로드캐스트 방법을 이용한 LED 기반 가시광 통신 시스템을 구현하고 기능을 검증하였다.

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