• Journal of the Korean Society for Library and Information Science
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• v.35 no.1
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• pp.123-141
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• 2001

This study is to examine academic phenomena of public administration research field in Korea through analysing the trends of researcher behavior. For the purpose of this study I analysed the types of research performance, reference materials, core journals, and the half-life of reference materials by investigating the articles in Korean Public Administration Review which is one of the major journal in this discipline. The results I found out are the followings: most of researches of the public administration are performed individually by the established academic fellows : researchers show their preference to foreign journals: as for the case of domestic journals, researchers tend to refer the latest issue: the major journal is discriminated from the others by getting a higher points

• Proceedings of the Korean Society for Information Management Conference
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• 2003.08a
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• pp.233-244
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• 2003

본 연구는 우리나라 디자인학분야 5개 학회(협회)지의 2002년분에 인용된 3,046개 문헌을 인용문헌의 형태별, 발행지별, 발행년도별, 주제별로 분석하여 디자인학분야 연구자의 문헌 이용행태와 문헌의 이용가치 감소현상 즉 반감기를 측정하였다. 연구결과 디자인학분야 연구자들은 단행본(62.5%), 학술잡지기사(21.8%), 논문(10.8%), 보고서(2.9%), 기타(2%)순으로 많이 이용하였으며, 단행본의 인용이 현저히 많은 것으로 자료 형태별 이용에 있어 국내 디자인학분야 연구자의 연구활동이 국내 사회과학, 미술분야와 유사하다고 볼 수 있다. 발행지별로 분석한 결과는 국내 디자인학분야 연구자들이 국내문헌을 해외문헌보다 2.5배정도 많이 이용한 것으로 국내문헌에 많이 의존하는 것으로 분석되었다. 이것은 해외문헌을 국내문헌보다 2배정도 많이 이용한 것으로 분석된 사회과학분야의 선행연구와 비교할 때 디자인학분야에서는 정반대의 현상을 보이는 것이나 4배정도 국내문헌을 많이 이용한 것으로 분석된 미술분야의 선행연구와는 유사한 결과를 나타내는 것이다. 디자인학분야 문헌의 반감기는 5.75년이었으며, 자료형태별 반감기는 단행본(6.64년), 논문(5.97년), 학술잡지기사 (4.55년), 기타(3.73년), 보고서(3.41년) 순으로 분석되었고, 발행지별 반감기는 해외문헌(9.1년), 국내문헌(5.1년)순으로 분석되었다. 또한 타주제와의 관계분석에 있어 경영학, 건축술, 공학 등과 긴밀한 관계를 맺고 있는 것으로 디자인학이 단순히 미를 추구하는 것이 아니라 산업경쟁력 증진의 도구로서 존재한다는 것을 알 수 있다.

• Radioisotope journal
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• v.4 no.4
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• pp.17-17
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• 1989

• Journal of the Korean Society for information Management
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• v.22 no.3 s.57
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• pp.85-102
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• 2005

The purpose of this study is to analysis the type of cited materials, dependence ratio of foreign information of domestic researchers, and to predicts half-life of life science for the collection development of libraries and user friendly information services. The journal articles was extracted from five subjects-medical science, pharmacy, food science, agricultural science, microbiology. In result, it was found that it citing the scholarly journal most plentifully, and dependence ratio of foreign information of domestic researchers was high most the microbiology. And then, half-life of life science was found 8.98 in agricultural science, and 7.11 in food science, and 6.96 in pharmacy, and so on.

• The Korean Journal of Pesticide Science
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• v.9 no.3
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• pp.231-236
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• 2005

This study was conducted to determine the amounts of pesticide residues after treatment of criterion dose with 4 pesticides(tolclofos-m, folpet, procymidone, and triflumizole) under cultivated period and to compare the biological half-life of pesticides with 6 kinetic models(first, zero and second order kinetics, power function, elovich and parabolic model) and to establish proposed field tolerance using biological half-lives. Recovery of 4 pesticides form strawberry was ranged from 85.1 to 105.5%. For all of 4 pesticides, dissipation rate was over 73% at 5 days after application. Among 6 kinetic models, first order kinetic model (FO) was best fit to describe the relationship between residual pattern of pesticides and time. Therefore, half-lives were calculated by FO for establishing the field tolerance. These results showed that half-life should be calculated by comparative best fit kinetic model and field tolerance can help to prevent unacceptable agricultural products from marketing. It is good for both consumers and farmers having safe agricultural products and financial benefits, respectively.

• Nuclear Engineering and Technology
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• v.27 no.2
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• pp.260-268
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• 1995

국내 원자력발전소의 방사성폐기물 발생량은 초고압 압축, 농축폐액 건조, 페수지 건조 등의 폐기물감용을 위한 운영계획이 수립되고 또한 일부 원자력발전소에서는 1995년부터 운영이 시작될 예정이어서 감소가 예상되고 있다. 원자력발전소로부터 방사성폐기물의 누적량은 2035년까지 운영자의 폐기물 감용 계획을 고려한다면 141,920 드럼으로 예상할 수 있고, 이에 상응하는 방사능량은 반감기가 한달 이상인 30개 핵종에 대하여 방사성 붕괴를 무시할 때 49,390 Ci였다. 특히 원자력환경관리센터에서 수행한 개념설계에 따른 1차 건설예정의 지하 처분동굴의 적재량인 약 10만 드럼은 2014년까지 누적량으로 채울 수 있고 이때 처분장의 장기적 성능평가에 주요 고려 대상인 반감기가 5년 이상의 14개 핵종에 대한누적 방사능량은 약 13,577 Ci였다. 이 예측된 발생량과 재고량은 처분장 장기적 성능 및 안전성 평가에 중요한 기초자료가 될 것이다.

• Journal of the Korean Society for information Management
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• v.26 no.2
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• pp.211-222
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• 2009

Electronic publishing has influenced, and in some ways changed, information seeking, reading patterns and citation behaviours. This study collected the Cited Half-Lives, the indicator implies the life-span of scholarly journals, from JCR Social Science edition the before and after of the prevalence of electronic journals, and observed if there are some changes in these two periods. The analysis results of eight disciplines show that the average Cited Half-Lives increased in 2007 than in 1994 for seven disciplines except the demography. Especially in the four disciplines of economics, education, finance and sociology, the average Cited Half-Lives increased significantly. This results show that the concentration, researchers cite more recent articles and concentrate their citations on fewer ones, is lightening and the dispersion of citations is actually increasing. With the online availability of articles and journals the old online materials can be often accessed, used and cited more frequently, the more growth potential of Cited Half-Lives are made in a digital environment. Further research needs to investigate if the phenomenon will become more obvious in various disciplines after a few years.

• Journal of Radiation Protection and Research
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• v.34 no.2
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• pp.87-94
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• 2009

Tritium is the one of the dominant contributors to the internal radiation exposure of workers at pressurized heavy water reactors (PHWRs). This nuclide is likely to release to work places as tritiated water vapor (HTO) from a nuclear reactor and gets relatively easily into the body of workers by inhalation. Inhaled tritium usually reaches the equilibrium of concentration after approximately 2 hours inside the body and then is excreted from the body with a half-life of 10 days. Because tritium inside the body transports with body fluids, a whole body receives radiation exposure. Internal radiation exposure at PHWRs accounts for approximately 20-40% of total radiation exposure; most internal radiation exposure is attributed to tritium. Thus, tritium is an important nuclide to be necessarily monitored for the radiation management safety. In this paper, metabolism for tritium is established using its excretion rate results in urine samples of workers at PHWRs and an effective half-life, a key parameter to estimate the radiation exposure, was derived from these results. As a result, it was found that the effective half-life for workers at Korean nuclear power plants is shorter than that of International Commission on Radiological Protection guides, a half-life of 10 days.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.12 no.3
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• pp.19-28
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• 2013

This study evaluated the quantitative effects of the deployment of semi-actuated signal systems using field data. For this, a semi-actuted signal system was deployed in the regional roadway network extensively. This paper investigated an operating strategy of semi-actuated signal systems for field application, and implemented the functional strategy into the standard signal controller. The performance was evaluated using three measures of effectiveness such as traffic volume, travel time, and the number of delayed vehicle. From the analysis results, traffic volume increased about 9.4% and 11.3% for morning and evening peak periods, respectively. The average travel time was reduced about 6.3% and 7.8% during morning and evening peak periods, respectively because of the expansion of bandwidths for major streets. In addition, the number of delayed vehicles was reduced about 36.4% and 23.9% for morning and evening peak periods, respectively. It is expected that the effectiveness of signal control system can be improved by incorporating a properly designed semi-actuated signal system in regional roadways with directional demand variation.

• Journal of the Korean Society for information Management
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• v.11 no.2
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• pp.31-48
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• 1994

This study attempts to investigate the scatter of citation, obsolescence, and half-life of some social science literature. For the study 131 journal articles taken from three scholarly journals in the field of Economics. Public Administration, and Library and Information Science are selected and all analyses are taken in terms of the material types, the publication place, and the publication year of the papers cited by those journal articles. In result, it was found that the half-life of monographs is 6.76, that of scholarly journal articles 8.07, that of reports 6.49, and that of theses 3.45. Also, the study finds that most researchers in those field, cited more articles published in foreign countries(67.79%) that those published from Korea(32.21%).