• Journal of Information Display
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• 제3권3호
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• pp.12-16
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• 2002

We first review a real-time three-dimensional (3-D) holographic recording technique called optical scanning holography (OSH) and discuss holographic reconstruction using spatial light modulators (SLMs). We then present how the overall system can be used for 3-D holographic television (TV) display with a wide-angle view of a 3-D image, and address some of the issues encountered. Finally, we suggest some techniques to alleviate the issues encountered in such a 3-D holographic TV system.

• Journal of the Optical Society of Korea
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• 제14권2호
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• pp.104-108
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• 2010

We proposed an axis transformation technique which reveals a distance parameter directly from optical scanning holography (OSH). After synthesis of a real-only spectrum hologram and power fringe adjusted filtering, we transform an original frequency axis to a new frequency axis using interpolation. In the new frequency axis, the filtered hologram has a single frequency which is linearly proportional to the distance parameter. Thus, the inverse Fourier transformation of the filtered hologram gives a delta function pair in the new spatial axis. Finally, we extract the distance parameter by detecting the location of the delta function pair.

• Journal of the Optical Society of Korea
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• 제4권1호
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• pp.48-53
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• 2000

In Optical Scanning Holography(OSH), 3-D holographic information of an object is generated by 2-D active optical scanning. The optical scanning beam can be a time-dependent Gaussian apodized Fresnel zone plate. In this technique, the holographic information manifests itself as an electric signal which can be sent to an electron-beam-addressed spatial light modulator for coherent image reconstruction. In this paper, we briefly review optical scanning holography and analyze the resolution achievable with the system. We also present mathmatical expressions of real and virtual images which are responsible for holographic image reconstruction. We then show the twin-image noise effect on the reconstruction in conjunction with the size of the Fresnel zone pattern through computer simulation.

• 한국광학회지
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• 제25권3호
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• pp.142-145
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• 2014

본 논문에서는 광 스캐닝 홀로그래피 기술을 이용하여 실제 물체의 복소 홀로그램 정보를 스펙클 잡음 없이 촬영하였다. 촬영된 복소 홀로그램 정보를 수치적인 방법으로 복원한 뒤 결맞음 광원과 CCD 카메라를 이용하여 촬영한 실제 물체의 영상과 비교하여 스펙클 잡음에 의한 오염도를 평가하였다. 스펙클 잡음에 의한 오염도를 정량적으로 평가하기 위하여 두 영상의 스펙클 패턴의 대비 수치를 이용하였다.

• 한국식품과학회지
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• 제48권3호
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• pp.201-207
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• 2016

메밀껍질은 메밀 알곡보다 유효성분이 많음에도 불구하고 식품학적 가치가 떨어져 대부분 폐기되고 있다. 따라서 이를 기능성 식품소재로 활용하기 위해 효소분해하여 기능성 올리고당을 생산하고 이들의 특성을 분석하였다. 올리고당 생산을 위한 최적 가수분해조건은 셀룰로스 분획의 경우 pH 5.0, $40^{\circ}C$, 기질농도 4%로 결정되었으며, 헤미셀룰로스 분획은 pH 5.0, $40^{\circ}C$, 30 unit으로 결정되었다. 최적 분해조건을 이용하여 72시간 효소분해 후 얻은 올리고당의 생산량을 측정한 결과, 셀룰로스와 헤미셀룰로스 분획으로부터 얻은 올리고당의 수율은 각각 132.37 g/kg 및 393.04 g/kg이었다. 또한 각 분획의 올리고당 함량을 측정한 결과, 포도당, 자일로스, xylobiose, xylotriose, cellobiose 및 cellotriose가 검출되었다. 올리고당(OSC, OSH)의 산화방지 활성을 측정한 결과, OSC는 분해시간이 증가할수록 산화방지 활성은 감소한 반면 OSH는 증가하였다. 또한 메밀껍질로부터 생산된 올리고당 첨가 시, 모든 비피더스 균주의 생육이 control에 비해 증가하여 프리 바이오틱 효과가 있음을 알 수 있었다. 이상의 연구결과, 효소분해에 의해 메밀껍질로부터 올리고당을 생산할 수 있었으며, 산화방지와 프리바이오틱 효과가 있음을 확인하였다. 따라서 목적에 따라 효소의 처리시간 및 방법을 다양화한다면 기능성식품으로의 활용이 더 높아질 것으로 예상된다.

• Safety and Health at Work
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• 제6권2호
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• pp.146-150
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• 2015

Occupational health and safety (OHS) is a broad field of professional practice, which involves specialists from different disciplines including but not limited to engineers, occupational health physicians, physical and biological scientists, economists, and statisticians. The preventive systems required to ensure workers are protected from injuries and illnesses dwell heavily on engineers; however, the extent to which the engineer can go regarding planning and implementing preventive measures is dependent on specific legal requirements, leadership commitment from the company, organization, and nation. The objective of this paper is to identify the areas of opportunities for improvements in OHS management in Ghana with regard to the nation's legal requirements, commitment of the Ghana government, and Ghanaian leadership as well as appropriate structuring of Ghanaian institutions responsible for monitoring and managing OHS in Ghana. This paper identified Ghana's fragmented legal requirements concerning OHS, which are under different jurisdictions with unclear responsibilities and accountabilities. The paper also highlights the training needs of Ghanaian academic institutions regarding OHS. Among other recommendations made including structuring of Ghanaian institutions to manage OHS in line with the ILO-OSH 2001, this paper aligns the recommendations with the articles and elements of International Labour Organization convention number 155 and OHSAS 18001 elements.

• 한국산업보건학회지
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• 제25권3호
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• pp.254-284
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• 2015

Objectives: There is a requirement to select target materials for mutagenicity(Genotoxicity) testing, so we determined to set the test priorities of them by searching the related database. Methods and Results: We searched a number of databases to find information on mutagenicity tests with chemicals under the Occupational Safety and Health Act(OSH Act), such as KOSHANET, National Toxicology Program(NTP), European Chemicals Agency(ECHA), US National Library of Medicine(NLM), and Genetic Toxicology Data Bank(GENE-TOX), as well as ChemIDplus webpage, and presented the information. Also we anticipated their hazards with ACToR sites to confirm the 58 mutagenicity(Genotoxicity) tests we will perform. Conclusions: We presented target materials for mutagenicity testing with specific GLP tests consisting of reverse mutation(Ames), chromosomal aberration and micronucleus test.

• 대한구순구개열학회지
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• 제13권1호
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• pp.11-22
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• 2010

키르기즈스탄은 옛 실크로드의 한 가운데에 위치한 중앙아시아 국가로서 소련연방이 해체된 뒤 1991년에 독립한 신독립국(Newly Independent States, NIS)의 일원이다. 대한민국과의 공식적인 수교가 1992년에 이루어진 이후 18년이 지났지만 키르기즈스탄 거주 한국인의 숫자는 약 900명에 불과하며 특히 이들 중 대부분은 수도인 비쉬켁(Bishkek)에 살고 있다. 남 키르기즈스탄 제 1의 도시이자 옛 실크로드의 중심지로 유명했던 오쉬(Osh)시에는 2009년 말 기준 약 50여명의 한국인이 살고 있다. 한국얼굴기형환자후원회의 후원으로 구순구개열 자선수술팀은 2002년~2009년까지 11개국, 19회의 자선수술 활동을 다녀왔으나 중앙아시아 국가로의 방문은 키르기즈스탄이 최초였다. 많은 봉사활동국에서 지역적, 문화적 그리고 의료환경적인 어려움이 있었지만 2008년 12월, 2009년 7월 두 번의 키르기즈스탄 오쉬시로의 활동도 예외는 아니었다. 본 논문에서는 최초의 중앙아시아 키르기즈스탄 구순구개열 자선봉사활동에 대한 자세한 보고를, 준비과정에서부터 활동 완료시점까지 서술하고자 한다.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2019년도 추계 학술논문 발표대회
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• pp.199-200
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• 2019

Although accidents in the domestic construction industry have been decreased gradually, deaths in the construction sites have been occupied 49.9 percent of the total industry and deaths from fall accident have been accounted for 59.7 percent of the construction industry. In order to prevent fall accident, Occupation Safety and Health Act(OSHA) was enacted for setting management standards and detailed regulations was designed by the Ministry of Employment and Labor. Although government has been pushed for companies and workers to comply the regulations, currently, many domestic construction sites have been violated. On the other hand, in safety-advanced countries such as the United States, Japan, and the EU, industrial accidents have been decreased due to continual application of adapted safety policies according to characteristic in each country. Therefore, it is necessary to analyze laws and polices of advanced countries and apply them to domestic construction sites in order to reduce fall accidents. Therefore, the objective of this study is to compare domestic laws related fall accident with advanced countries laws. In the future, the results of this study will be utilized as a reference to reinforce Occupation Safety and Health Act(OSHA).

• Safety and Health at Work
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• 제10권2호
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• pp.213-218
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• 2019

Background: Motorcycles are one of the important members of commercial transportation because of the convenient use during congested traffic conditions and the ease of parking in narrow streets. This study investigates the characteristics of crashes and traffic signal violations caused by motorcycle couriers. Methods: From the national compensation data, this study analyzed the traffic crashes caused by 671 motorcycle couriers. Results: Among 671 injured couriers, 50.6% were aged less than 40 years, 49.2% run in a small business of <5 employees, and 47.2% had work experience of <6 months. Motorcycle crashes occurred mainly due to "rider overturned alone" (67.5%), in the daytime (73.5%), or on cloudy or clear days (77.2%). However, the violation rate caused by motorcycle couriers was high in couriers in a small business of <5 employees (13.9%), with work experience of <6 months (13.9%), on cloudy or clear days (12.4%), on an intersection (29.8%), in the type of "crash with a vehicle" (31.2%), or in a death accident (35.7%) Conclusion: The findings of this study can be used as a baseline in devising policies for preventing crashes of motorcycle couriers.