• Economic and Environmental Geology
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• v.30 no.5
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• pp.407-416
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• 1997

Soil, tailings, stream sediment and surface water samples collected in the vicinity of the Geumwang Au-Ag mine were analyzed in order to investigate the pollution level of heavy metals and to determine the dispersion patterns. Although the maximum concentrations of soils collected at the flotation plant and tailings dam were 9,270 ppm As, 17 ppm Cd, 1,480 ppm Cu, 10,080 ppm Pb and 18,400 ppm Zn, dispersion of heavy metals were limited in the vicinity of the flotation plant and tailings dam. This may be due to high pH values (> 8.0) of the soils by flotation solution for mineral processing. The pH values of water samples near the flotation plant and tailings dam were over 8.0 and Cd, Cu and Zn concentrations were not detected. The waters in the vicinity of Geumwang mine generally belong to a $Ca^{2+}-SO_{4}{^{2-}}$ $(HCO_3{^-})$ type.

• Journal of Environmental Impact Assessment
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• v.12 no.5
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• pp.359-367
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• 2003

The total pollution load management system of watershed has been implemented upon Special Law pertaining to the Han River Watershed Water Quality Improvement and Residents Support, Special Law pertaining to the Nakdong River Watershed Water Management and Residents Support, Special Law pertaining to the Youngsan River Watershed Water Management and Residents Support, and Special Law pertaining to the Seomjin River Watershed Water Management and Residents Support in Korea since 2002. But many other similar systems with total pollution load management system of watershed are being operated separately or independently, even though its purpose is nearly same with those of the total maximum pollutants load management in Law on Water Quality Environmental Protection, environmental impact assessment(EIA) in Law of Impact Assessment on Environment, Transportation and Disaster and Pre-environmental assessment of Environmental Policy Act. Therefore the contents of total pollution load management system of watershed and many other related systems could be overlapped and at some times have inconsistency among them. This study suggests first the integrated operation of total pollution load management system of watershed, EIA, pre-environmental assessment, urban planning, and sewage planning and secondly EIA system development by integration of EIA and pre-environmental assessment and strategic environmental assessment(SEA).

• Analytical Science and Technology
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• v.13 no.3
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• pp.315-322
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• 2000

The response characteristics of the bioelectrode developed by the co-immobilization of spinach root tissue and ferrocene in a carbon paste matrix for the amperometric determination of hydrogen peroxide were evaluated. In the range of electrode potential examined (-0.3~0.0V vs. Ag/AgCl). the response time was relatively short ($t_{95%}=11.8$ sec) and it responded in the wide range of pH. Also, its detection limit was $2.25{\times}10^{-6}M$ (S/N=3) and a relative standard deviation of the measurements which were repeated 15 times using $1.0{\times}10^{-3}M$ hydrogen peroxide was 1.87%. The bioelectrode sensitivity decreased to 40% of the original value in 19 days of continuous use.

• Journal of Korean Society for Atmospheric Environment
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• v.18 no.4
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• pp.297-303
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• 2002

Fine particles (d$_{p}$ < 2.5 $\mu$m) were measured using an annular denuder system (ADS) in Chongju. The data set was collected on fifty-eight different days with a 24-hr sampling period from October 27, 1995 through August 25, 1996. Particulate nitrate in the ADS was also measured on teflon and nylon filters in series behind denuders to collect HNO$_3$, HNO$_2$, SO$_2$and NH$_3$. From this study. the mean concentration of particulate nitrate of PM$_{2.5}$ in the ADS were seen with the following order: winter (5.05) ＞fall (4.36) ＞spring (3.92) > summer (1.10 $\mu\textrm{g}$/㎥). Nitrate losses, which calculated from the ratio of nylon filter nitrate to the sum of teflon and nylon filter nitrates, varied in the following manner summer (72.2%) > spring (42.6%) > fall (23.5%)> winter (0.4%). Especially, gaseous nitric acid was dominant at temperature higher than 8$^{\circ}C$ while particulate nitrate was major species in total nitrate below that temperature. This indicates the particulate nitrate loss is strongly correlated rather with ambient temperature.e.e.

• Korean Journal of Human Ecology
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• v.5 no.1
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• pp.99-111
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• 1996

The purpose of this study is to find some directions to enhance high school students' recognitions for the necessity of Home Economics(HE) education. 309 respondents were sampled from boys', girls' and co-ed high schools in Chongju. The questionnaire consisted of some items about the respondents' interest, necessity, and the required level for HE. The results are as follows : 1) Students from girls' high school and co-ed high school showed more interest in HE than did the students from boys' high school. 2) The recognition of the necessity for learning HE in high school was significantly differed according to the school systems. 3) The demand level on HE was 52.8 out of 100 point, which is fairly low. Girls from co-ed high school showed higher demand on HE than did the girls' high school. 4) The highest demand level of students in the detailed domains of HE was on consumption. And the students showed a comparatively high demand on health, job, and consumption, while showing low demand on clothing. 5) Students from boys' high school and co-ed high school favored practice-oriented HE education.

• Journal of KIISE:Computer Systems and Theory
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• v.26 no.2
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• pp.232-241
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• 1999

기존의 연구는 FSM을 기본으로 제어흐름만을 분석하거나 시험목적을 시험열 생성 단계에서 고려하지 않음으로써 시험열의 실제 적용에 있어 많은 문제점을 갖는다. 따라서 이 연구에서는 SDL로 기술된 프로토콜 명세서를 시멘틱 모델인 LTS로 변환 후 LTS로부터 서브투어 단위로 시험열을 생성하였다. 그리고 생성된 시험열을 TTCN으로 변환하고 단위 테스트를 위한 추가 정보로서 프리앰블, 포스트앰블, 리셋 정보등을 LTS로부터 생성하였다. 또한 LTS로부터 한 노드에서 전이 가능한 모든 경로를 트리로 표현함으로서 향상된테스트 커버리지를 갖는 서브투어를 생성하였으며 SDL을 시맨틱 모델인 STS로의변환 EH한 기존의 입력과 출력만을 고려하는 FSM에서 발생하는 비결정성 문제를 해결할 수 있다. 따라서 이 연구에서의 테스트 목적이 고려된 TTCN 표현의 테스트 케이스 생성은 적합성 시험을 위한 테스스 케이스의 실제 적용 및 프로토콜 구현의 생산성을 높일 수 있으며 테스팅 환경의 기반을 제공한다.

• Proceedings of the Korea Multimedia Society Conference
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• 1998.10a
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• pp.309-314
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• 1998

가상교육(cyber education)은 원격교육에서 시작되어 웹 기반 교육(Web-based Instruction)에 이르기까지 많은 발전을 거듭하여, 최근 국내외에 많은 웹 기반 코스웨어와 가상 클래스 관리 소프트웨어가 개발되고 있다. 가상교육을 위한 코스웨어는 지금까지 텍스트와 이미지 위주의 정적인 구조로 구성되었으나, 최근 웹과 멀티미디어 기술의 발전에 힘이어 이제는 다양한 멀티미디어를 컨텐츠(contents) 개발에 활용하고 동적인 구조와 상호 작용성을 지원할 수 있게 되었다. 본 논문은 이러한 기술발전에 근거하여 웹 기반 코스웨어를 개발하기 위한 컨텐츠 개발모델을 제시하고, 이 개발모델에 기반한 멀티미디어 배움터 개발사례를 설명한다. 멀티미디어 배움터는 10개의 Contents Chapter와 8개의 Lab.으로 구성되어 있으며, 현재 연세대학교 학부 과목인 멀티미디어 강의에서 활용되고 있다.

• Proceedings of the KIEE Conference
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• 2005.07a
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• pp.377-380
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• 2005

In this paper, accelerated stress test(AST) for Magnetic Switch (MS) are applied to assure specified reliability of the products. Magnetic contactor that functions with over-current relay is called MS. Magnetic contactor closes and opens the motor load with ON/OFF switch of electronic contactor. It is also used for protecting and controlling the load. Magnetic contactor detects the over-current flow in the load with a over-current relay and disconnects the load by opening its control power. In this study, AST for product assembly are developed in order to improve the weak point so that increase the product reliability. Also we will show the basic information for the accelerated life test(ALT). The proposed AST results and procedures may be extended and applied to testing similar kinds of products to reduce test times and costs of the tests remarkably. Finally the results of this study will contribute to improving reliability of products and strengthening competitiveness of our products in the world markets.

• Journal of the Society of Cosmetic Scientists of Korea
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• v.28 no.3
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• pp.63-90
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• 2002

Quantitative measurement of melanin is the best method to evaluate whitening effect of cosmetics on human skin. However, non-invasive method to quantify human skin melanin with high precision has not been established. Whitening effect of cosmetics on the skin results in lightening of skin color. Therefore, it is reasonable to measure skin color in a reproducible manner for the assessment of whitening effect. Several Instruments or methods, such as colorimeter, mexameter, and visual assessments by experts , have been used for this purpose. In this lecture I will review the details of various assessment methods for the evaluation of whitening effect and discuss the pros and cons of each method. Then I will present briefly the results of clinical trial. Finally I will introduce new non-invasive modalities to quantify melanocytes.

• The Journal of Korean Academy of Orthopedic Manual Physical Therapy
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• v.10 no.1
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• pp.5-41
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• 2004

운동치료는 환자가 자기 자신의 치료에 직접 참여한다는 측면에서 다른 수동적인 치료보다 더 효과적이라고 생각된다. 이 논문의 목적은 관련문헌을 찾아내어 경추의 장애를 치료하는데 운동치료가 효과적이라는 것을 입증하는 증거를 찾아내기 위한 것이다. 경추 장애를 치료하기 위한 여러 가지 형태의 운동치료를 포함하는 연구를 찾아내기 위하여 7가지의 컴퓨터 문헌탐색을 수행하였고 출판된 전문을 아들레이드 내에서 구할 수 있는 것만 검토하였다. 문헌 평가도구를 사용하여 연구의 질을 평가하였고 그 결과를 표로 제시하였다. 111개의 문헌 중 34개가 포함 기준에 합당하였으며 이 중 18개의 임상실험연구를 수집하여 운동치료의 효과를 조사하기 위하여 그 질을 분석하였다. 임상실험연구의 전체적인 질은 "우수"였다. 도수치료와 운동치료를 병행하여 치료를 실시한 5개의 "탁웰"한 질의 임상실험연구에서 근력의 증가와 통증의 감소를 보였다. 3개의 임상연구에서 근력강화운동이 증상의 경감에 효과가 있다고 하였다. 2개의 "우수"와 "중등도"의 질의 문헌에서 집단운동이 개별적인 물리치료만큼 효과가 있다고 하였다. 고유수용성 운동과 다른 형태의 운동 또한 경추의 장애의 치료에 효과가 있는 것으로 나타났다. 이 글의 소견은 경추 장애의 치료에 운동이 효과적이라는 이전의 연구결과를 지지한다. 또한 경추 장애의 치료에 다른 형태의 운동의 상대적인 효과를 확인하기 위한 훌륭한 질의 연구가 더 행해질 필요가 있다고 본다.