직업적 연폭로에서 혈중 연량 수준에 따른 선별검사로서의 혈중 ZPP 검사의 타당도

한구석,안현철,김용배,리갑수,김화성,황규윤,장봉기,이성수,안규동,이병국 순천향대학교 산업의학연구소 1999 순천향산업의학 Vol.5 No.1

In order to evaluate the validity of current screening criteria of lead exposure and to provide effective information for the better health management of lead workers, author investigated the interrelationship between blood lead and blood zinc protoporphyrin(ZPP) and evaluate the validity of blood zinc protoporphyrin as the screening test and blood lead as gold standard of diagnostic test. The total of 2245 lead workers (male workers: 1982, female workers : 263) from 12 lead using industries were studied. Blood lead, ZPP, hemoglobin and hematocrit were selected as lead exposure variables. Personal information on sex, age and work duration were also checked. Blood lead was measured with flameless atomic absorption spectrometry (model: Hitachi 8100) using standard addition method. Blood ZPP was measured with portable hematoflurometer (model: Aviv 206). The results obtained were as follows: 1. The mean blood lead of all lead workers were 0.7±14.3㎍/㎗(Male: 31.0±14.4㎍/㎗, Female: 28.2±12.9㎍/㎗), whereas the mean blood ZPP of those were 68.1±47.5㎍/㎗(Male: 63.9±43.7㎍/㎗, Female: 100.1±61.0㎍/㎗). The mean value of hemoglobin and hematocrit of all lead workers were 14.5±1.5g/㎗(Male: 14.7±1.3g/㎗, Female: 12.3±1.2g/㎗) and 45.4±3.6(Male: 46.2±2.8, Female: 39.5±3.1) respectively. 2. Validity of test using blood zinc protoporphyrin as screening test for blood lead levels of 30㎍/㎗ as gold standard of diagnostic test revealed that the highest validity value for male and female lead workers were 50 and 90 ㎍/㎗ of ZPP respectively, showing 50 and 60 ㎍/㎗ of ZPP for all lead workers. While those test for blood lead levels of 40㎍/㎗ as gold standard of diagnostic test revealed that the highest validity value for male and female lead workers were 60 and 90 ㎍/㎗ of ZPP respectively, showing 60 ㎍/㎗ of ZPP for all lead workers, those test for blood lead levels of 50 and 60㎍/㎗ as gold standard of diagnostic test revealed that the highest validity value for male and female lead workers were 60 or 70 and 100 ㎍/㎗ ZPP respectively, showing 60and 70 or 80 ㎍/㎗ of ZPP for all lead workers. 3. Predictive value of test using blood zinc protoporphyrin as the screening test for different blood lead levels of 30, 40, 50 and 60㎍/㎗ as gold standard of diagnostic test revealed that positive predictive value of screening test were decreased by the increase of blood lead level regardless of csreening criteria value ZPP and negative predictive value of screening test were increased accordingly regardless of screening criteria value of ZPP. On the other hand, within same blood lead level as a gold standard positive predictive values were inceased by the increase of screening criteria value of ZPP, whereas the negative predictive value were decreased accordingly by the the increase of screening criteria value of ZPP. 4. The correlation analysis of all lead workers among study variables revealed that CPbB and natural log transformation ZPP(LZPP) were better correlated with other variables and found to be better estimate than PbB and ZPP themselves. The age was correlated with all other variables, but the work duration was not. The correlation analysis of male and female workers among study variables revealed the same results with all lead workers. 5. The slope of simple linear regression of CPbB (independent variable) with ZPP in female workers(3.223)was steeper than in male workers(2.144). That of lead workers with work duration of less than 1 year was steeper than that of lead workers whose work duration was more than 1 year. But there was no slope difference between two groups divided by their work duration of 2 years less and more. The slope of simple linear regression of CPbB lead (independent variable)with ZPP in lead workers whose blood lead were higher than 30㎍/㎗and 40㎍/㎗ were steeper than those whose blood lead were less than 30㎍/㎗ and 40㎍/㎗. 6. The slope of simple linear regression of CPbB (independent variable) with ZPP in lead industries with low mean blood lead were less steeper than those with high mean blood lead. 7. The slope of simple linear regression of CPbB (independent variable) with LZPP in female workers(0.0308was steeper than in male workers(0.0253). That of lead workers with work duration of less than 1 year was steeper than that of lead workers whose work duration was more than 1 year. But where was no slope difference between two groups divided by their work duration of 2 years less and more. While the slope of simple linear regression of CPbB lead (independent variable) with LZPP in lead workers whose blood lead were hogher than 30㎍/㎗ was not steeper than those whose blood lead were less than 30㎍/㎗, there was no slope difference between two groups whose blood lead were less than 40㎍/㎗ and more than 40㎍/㎗. 8. The slope of simple linear regression of CPbB (independent variable) with LZPP in lead industries with low mean blood lead were less steeper than those with high mean blood lead, but the difference was not significant then that of CPbB and ZPP. With above results, it is recommended that the screening criteria value of ZPP should be down to 60-70㎍/㎗ from 100㎍/㎗ for male lead workers and screening criteria of ZPP for female lead workers was all right with current value of 100㎍/㎗. So it is recommended to make different screening criteria of ZPP for male and female workers like the hemoglobin and hematocrit screening criteria. It is also preferable to use CPbB and LZPP rather than uncorrected PbB and ZPP in the evaluation of lead exposure for lead workers.

인터넷 서비스 유형분석 모델 개발에 관한 연구

박주석,박진휘,이한규 한국경영과학회 2001 한국경영과학회 학술대회논문집 Vol.- No.1(2)

Electronic Commerce grows rapidly in the past few years. Also, the power of EC doesn't become weak in the future. The increase of EC market scale provides powerful foundation to the Internet development. Unlike other technology, Internet has several distinctive character. First, As Internet spreads fast to the public, it became the usable technology to them in a short time. Second, Comparing to other technology, the work with using Internet isn't difficult to public so the basis of technology prepared in a short period. Third, Internet applicates all the industry and economic so, it makes economic foundation for making synergy during a short period. These Internet characters influence to EC growing speed which is basement of Internet growth. Due to Digital revolution giving much more influence than last Industrial Revolution, E-Business such as e-Management, B2B, B2C became the survival strategies for enterprise's management efficiency. Owing to emergence of technology like ultrahigh speed data communication, Broadband communication, wireless Internet, Internet TV, IS95C(2.5GB), 3G and activation of internet business, products and service through Internet become realized. Because of this, Supply of products and service through Internet are on the increase. But demand of voice communication become saturated, so increase of profit and sale through it reach the limit. Communication demand for products and service is a growing tendency. Consequently, research about vision and business strategies of Internet service for promoting the business founded on internet required.

이동 호스트를 갖는 네트워크에서 효율적인 인과 순서화 알고리즘의 설계 및 평가

박규석,김재수,배인한 대구효성가톨릭대학교 응용과학연구소 1998 응용과학연구논문집 Vol.6 No.2

The mobility of hosts causes various challenges and problems in designing distributed algorithm, and traditional causal ordering algorithms are not suitable to mobile hosts. This paper presents a simple and efficient algorithm that all messages are sent and delivered in causal order. Also, the algorithm has the low costs of computation and wireless communication.

아래턱뼈 계측을 통한 한국인의 체질인류학적 특징 및 남녀판별함수 분석

허경석,고기석,정한성,강민규,최병영,김희진 대한췌담도연구회 2000 대한췌담도연구회지 Vol.5 No.4

주문형 비디오 시스템을 위한 장치 대역폭 감소 알고리즘의 성능 평가

박규석,이경숙,배인한 대구효성가톨릭대학교 응용과학연구소 1998 응용과학연구논문집 Vol.6 No.2

Recently technological advances have made multimedia on-demand services, such as movies-on-demand and home-shopping, important to the customer market. One of the most challenging aspect of this type of service is to provide on-demand access, that is, users can view the movie either instanteneously or within a small and reasonable latency upon request. One way to reduce the latency is to simply purchase more disk. A more interesting and more economical approach might be to either attempt to improve the data layout and scheduling techniques or to reduce the I/O demand of each request in service through "sharing" of data between requests for the same object. There are several approaches to reducing the I/O demand on the storage server through sharing. Batching and adaptive piggybacking are studing as general I/O bandwidth reduction policies frequently. In this paper, both batching and simple piggybacking performances are analyzed by a simulation, and the performance between batching and simple piggybacking is compared.

폐굴껍질을 혼입한 콘크리트의 기초적 성질에 관한 실험적 연구

어석홍,이형진,황규한 國立 昌原大學校 産業技術硏究所 2002 産技硏論文集 Vol.16 No.-

The purpose of this study is to investigate the fundamental properties of concrete mixed with crushed oyster shells(OS) as coarse or fine aggregates. For this purpose, five reference mixes with W/C ratios of 0.4∼0.6 at intervals of 0.05 were considered. The replacement proportion of OS was varied with ratios of 0, 10, 30, 50 and 100% by volume of fine or coarse aggregate in the reference mixes. OS was washed and crushed for using as aggregates. New chemical reaction between crushed OS aggregate and and cement paste was tested through XRD and SEM analysis. The compressive and flexural strength properties were considered. Strength tests were carried out at the ages of 1, 3, 7, 14, and 28 days. The variation of workanility, air content and density, drying shrinkage of the specimens with different proportions of OS were also studied. Finally, the hollow concrete block using OS as a substitute material for fine aggregate was made for testing the application of OS. Experimental results showed that any new chemical reaction did not occur due to mixing crushed OS in ordinary concrete. The workability and strengths decreased with increase in proportion of OS. The same trend was observed in density and unit weight, but air content increased due to the inherent shape and texture of OS, which showed a possibility to produce light weight concrete with low strength by using OS as coarse aggregates for concrete. Tests on hollow concrete block showed that the compressive strength and absorption ratio were satisfied with quality requirements when the fine aggregate was substituted with OS up to 50% in volume.

장군봉(봉화군) 일대의 식물상

한종원, 양선규, 최슬기, 장창석, 김규식, 오병운 忠北大學校部設基礎科學硏究所 2007 自然科學硏究 Vol.21 No.-

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문수산(봉화군) 일대의 식물상

한종원, 양선규, 최슬기, 장창석, 김규식, 오병운 忠北大學校部設基礎科學硏究所 2007 自然科學硏究 Vol.21 No.-

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리눅스를 기반으로 한 홈오토메이션 서버의 구현

성한용,김규칠,방철원,김용석 江原大學校 産業技術硏究所 2002 産業技術硏究 Vol.22 No.B

It becomes common to use computers to control electronic devices and security facilities in newly constructed buildings and house. There are many home application devices in the market which can be controlled by computers. But they are expensive and managed by specialized companies. This paper is focused on personal computers which are available in most homes and can be used to control home electronic appliances and home security facilities. We implemented a home automation server based on Linux. The standard parallel port of personal computer is used to connect sensors and actuators. Therefore, the cost of the server is very low. Moreover, the server is connected to Internet and anywhere we can control and monitor the home security facilities and home automation systems.

분수로 분류부 형상에 따른 유량분배율 특성의 실험적 연구

최한규,백효선,이석환 江原大學校 産業技術硏究所 2002 産業技術硏究 Vol.22 No.A

The divided channel is not often used on the river and when the installation is for the controlling of the flow quantity. The determination of the channel size is not a easy task. Model tests are examined to confirm the variation of distribution rate by the method of the channel installation and the position of the structure and the adjustment of numerical simulation is executed by the comparing of the results. This study is to execute numerical model according to installation of divided channel by using AQUADYN program, the 2nd dimension numerical model, and HEC-RAS program, the 1st dimension numerical model, by the shape of divided channel. Also, it compares with difference by method about each case.