• The Optical Journal
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• s.150
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• pp.42-43
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• 2014

CODE V$^{(R)}$, Light Tools S/W 및 광학측정 업체인 (주)모던하이테크(대표이사 김명중)는 3월 17일(월)부터 19일(수)까지 사흘간 (주) 모던하이테크 세미나실(서울시 강남구 영동대로 511 무역센터 트레이드타워 1002호)에서 미국 ORA 광학 설계 프로그램 기술 매니저가 직접 내한하여 광학설계 특별 교육 세미나를 성공적으로 개최했다.

• Journal of the Korean Society of Safety
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• v.34 no.6
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• pp.13-21
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• 2019

Leakage accidents in businesses dealing with hazardous chemicals can have a great impact on the workers inside the workplace, as well as residents outside the workplace. In fact, there were cases where hazardous chemicals leaked from many businesses. As a result, the Chemicals Control Act(CCA) was enacted in 2015, the Ministry of Environment introduced an Off-site Risk Assessment(ORA). The purpose of the ORA is to secure safety from the installation of the design of the workplace facilities so that chemical accidents of hazardous chemical handling facilities do not cause human or physical damage outside the workplace. In general, the ORA qualitatively determines where a protected facility is within the scope of the accident scenario. However, elderly who belong to the sensitive group is more sensitive than the general group under the same chemical accident effect, and the extent of the damage is serious. According to data from the Korea National Statistic Office, the number of elderly people is expected to increase steadily. Therefore, a quantitative risk analysis considering the elderly is necessary as a result of a chemical accident. In this study, accident scenarios for 14 locations were set up to perform emergency evacuation due to toxic gas leakage of Cl₂(Chlorine) and HF(Hydrogen Fluoride), and the effects of exposure were analyzed based on the evacuation velocity difference of age 20s and 60s. The ALOHA(Areal Locations of Hazardous Atmospheres) program was used to calculate the concentration for assessing the effects. The time of exposure to toxic gas was calculated based on the time it took for the evacuation to run from the start point to the desired point and a methodology was devised that could be applied to the risk calculation. As a result of the study, the relative risk of the elderly, the sensitive group, needs to be determined.

• The Optical Journal
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• no.5 s.115
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• pp.38-40
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• 2008

1992년 설립한 (주)모던하이테크(대표.김명중)는 광학, 섬유패션, 전기전력, 온라인 웹 컨퍼런스 등의 분야에 프로그램만을 개발 및 공급해오고 있는 S/W 전문업체이다. 특히 이 회사의 매출에서 큰 부분을 차지하는 광학사업부에서는 렌즈 및 조명 설계전문 프로그램인 미국 Optical Research Associates(이라 ORA)사의 CODE V와 LightTools를 통해 삼성전자, LG전자 등 국내 주요 기업 및 연구소 등 약 700여 고객을 확보하고 관련 기술보급에 나서고 있다. 또한 그동안의 경험과 노하우로 Optical Engineering Service사업을 전개하고 있는 가운데 국내 광학설계산업의 기술발전 및 경쟁력 강화에 큰 역할을 담당하고 있다.

• Proceedings of the Optical Society of Korea Conference
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• 2003.02a
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• pp.272-273
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• 2003

제조기술이 발전함에 따라 비구면을 사용한 광학계 설계에 대한 많은 연구가 보고 되고 있다. 본 연구에서는 단일렌즈에서 다양한 렌즈면 조합 중에서 성능이 가장 우수하게 나타난 비구회절면(비구면과 회절면을 동시에 적용)을 사용하여 이군렌즈에 대해 F／l.0인 대구경 광학계를 설계하였다. 사용된 검출기 사양은 픽셀 크기 45um, 픽셀 수 320$\times$240 이며, fill factor 는 무시하였다. 광학계의 유효초점거리는 171.73mm 이며, 사용한 프로그램은 ORA 사의 Code V 이다. (중략)

• The Optical Journal
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• s.128
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• pp.36-37
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• 2010

광학설계 프로그램 전문업체인 (주)모던하이테크(대표 김영중, www.okmodern.com)는 지난 5월 10일부터 11일까지 양일간 서울 교육문화회관에서 '2010 LED핵심조명기술 및 CODE V & LightTools 컨퍼런스를 개최했다. '광학인의 날'이라는 주제로 한국광학기기협회와 전자신문 등이 후원한 이 행사에는 130여명의 국내 광학인들 외에 미국 Optical Research Associates(이하 ORA)사의 CEO인 Mr.Goerge Baze를 비롯한 임원진들이 함께하여 직접 비전을 소개하고 향후 국내 유저들을 위해 적극적인 서비스 지원을 약속했다.

• Journal of Korean Ophthalmic Optics Society
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• v.16 no.1
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• pp.61-64
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• 2011

Purpose: The purpose of this study was to design the finite model eye with GRIN lens similar to actual eye, which considered the effect of iris eccentricity on eyes. Methods: By using the finite model eye with Radial GRIN and Spherical GRIN, which were designed previously, the location of iris was eccentrically located by 0.5 mm in the direction of nose to show the same eye as actual one. For ray trace and design, Code V program of Optical Research Associates (ORA) was adopted. Results: Designed model eye was compared to actual eye depending on iris eccentricity and the model eye which showed reduced value was corrected according to actual eye to design the finite model eye. Conclusions: Ocular optical systems considered the point that iris was a rotational asymmetry and designed the finite model eye with GRIN lens, which was similar to actual eye, by considering the effect of iris eccentricity on eye.

• Journal of the Korean Society of Safety
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• v.32 no.2
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• pp.52-58
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• 2017

One of the most important elements of the management of chemical accident is threat zone estimation of fires, explosions and toxic gas dispersion based on chemical releases. The threat zone estimation is going to be standard of emergency response for the first defender and base line data of off-site risk assesment (hereinafter referred to as "ORA") and risk management plan (hereinafter referred to as "RMP"). Generally, ALOHA form EPA(U.S.) and Kora(from KOREA MINISTRY OF ENVIRONMENT) has been used for the off-site consequence analysis in Korea. However it is hard to predict accurate consequences rapidly in case of emergency. Hydrochloric acid is a multipurpose raw material used in many industrial applications such as chemical, metal and food industries. It is usually treated in concentrations from 10 ~ 35 %, and release accident have occurred frequently. In this study, we have developed a simplified estimating method and equation to calculate threat zone easily in case of emergency due to release accident of hydrochloric acid.

• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2017.05a
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• pp.73-73
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• 2017

환경부는 화학물질로 인한 국민건강 및 환경상의 위해(危害)를 예방하고 화학물질을 적절하게 관리하고, 화학물질로 인하여 발생하는 사고에 신속히 대응함으로써 화학물질로부터 모든 국민의 생명과 재산 및 환경을 보호하기위한 법률인 "화학물질관리법"을 2015년 1월 1일부터 시행하였다. 화학물질관리법에서는 유해화학물질의 취급기준과 유해화학물질 취급시설의 설치 및 관리 기준을 준수토록 하고 있으며, 유해화학물질 취급시설을 설치 및 운영 시에는 사전에 화학사고 발생으로 사업장 주변 지역의 사람이나 환경 등에 미치는 영향을 평가하여 유해화학물질 취급시설의 설치단계에서 안전성을 확보하기 위한 유해화학물질 화학사고 장외영향평가서를 작성 및 제출하도록 하고 있다. 또한 사고대비물질을 규정 수량이상 취급하는 경우 위해관리계획서를 작성하여 지역사회에 고지하도록 하고 있다. 법 시행 이전에 유해화학물질 취급시설을 설치한 사업장은 사업장 규모에 따라 장외영향평가서의 제출 유예기간인 2019년 12월 31일까지 제출하여야 하며, 사고 대비물질의 영업허가를 득해야하는 사업장은 2017년 내 장외영향평가서를 제출하여야 한다. 장외영향평가(off-site risk assessment(ORA)) 제도는 유해화학물질 취급시설의 기본평가정보(공정 정보), 장외평가정보(사고 시나리오 선정 및 위험도 분석), 타 법령과의 관계정보로 구성되어 있다. 장외영향평가의 효율적인 작성을 위하여 현장과 일치된 공정정보(공정개요 및 공정도면 등의 자료)의 확보가 필수적이다. 본 발표에서는 복잡한 장외영향평가 제도로부터 기업의 대응을 위한 장외영향평가 운영 절차와 장외영향평가서의 효율적인 작성을 위한 사전 준비 자료 및 작성 방안을 제시하여, 사업장에서 장외영향평가 제도를 이행하는데 도움을 주고자 한다.

• Fire Science and Engineering
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• v.32 no.3
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• pp.76-87
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• 2018

This study describes the damage effects modeling for a quantitative prediction about the hazardous distances from pressurized chlorine saturated liquid tank, which has two-phase leakage. The heavy gas, chlorine is an accidental substance that is used as a raw material and intermediate in chemical plants. Based on the evaluation method for damage prediction and accident effects assessment models, the operating conditions were set as the standard conditions to reveal the optimal variables on an accident due to the leakage of a liquid chlorine storage vessel. A model of the atmospheric diffusion model, ALOHA (V5.4.4) developed by USEPA and NOAA, which is used for a risk assessment of Off-site Risk Assessment (ORA), was used. The Yeosu National Industrial Complex is designated as a model site, which manufactures and handles large quantities of chemical substances. Weather-related variables and process variables for each scenario need to be modelled to derive the characteristics of leakage accidents. The estimated levels of concern (LOC) were calculated based on the Gaussian diffusion model. As a result of ALOHA modeling, the hazardous distance due to chlorine diffusion increased with increasing air temperature and the wind speed decreased and the atmospheric stability was stabilized.

• Safety and Health at Work
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• v.9 no.4
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• pp.416-420
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• 2018

Background: Urinary 1-hydroxypyrene (1-OHP) has been widely used as a biomarker of polycyclic aromatic hydrocarbons (PAHs) in occupationally exposed workers. The objective of this study is to investigate the concentration of urinary 1-OHP among charcoal workers as subjects and non-charcoal workers as controls. Methods: Early morning urine samples were collected from 68 persons (25 charcoal workers in Igbo-Ora, 20 charcoal workers in Alabata, and 23 non-charcoal workers) who volunteered to participate in this study. 1-OHP determination in urine samples was carried out using high performance liquid chromatography after hydrolysis. Descriptive and inferential statistics were used for data analysis at p < 0.05. Results: The mean urinary 1-OHP concentration (${\mu}mol/mol$ creatinine) among charcoal workers at Igbo-Ora and Alabata and non-charcoal workers were $2.22{\pm}1.27$, $1.32{\pm}0.65$, and $0.32{\pm}0.26$ (p < 0.01). There existed a relationship between respondent type and 1-OHP concentration. Charcoal workers were 3.14 times more at risk of having 1-OHP concentrations that exceed the American Conference of Governmental Industrial Hygienists guideline of $0.49{\mu}mol/mol$ creatinine than non-charcoal workers (relative risk = 3.14, 95% confidence interval: 1.7-5.8, p < 0.01). Conclusion: Charcoal workers are exposed to PAHs during charcoal production and are at risk of experiencing deleterious effects of PAH exposure. Routine air quality assessment should be carried out in communities where charcoal production takes place. Assessment of urinary 1-OHP concentration and use of personal protective equipment should also be encouraged among charcoal workers.