• Journal of Information Management
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• v.38 no.3
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• pp.111-135
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• 2007

The purpose of this study is to identify the citing behaviors of researchers in the field of mechanical engineering. It tries to verify if there is a significant difference on citing behavior of researchers between the past and the present with dissertations produced in P University as samples. For the comparison, years 1996 and 2004 are selected for the citation analysis. It analyzed four aspects, such as types of resources cited, languages used in cited documents, years since their publication of cited documents, and the journals indexed in SCI. The results of the analysis are; First, journals are the most cited than any other types of information resources. The citation of WWW resources which are gradually increasing for research is not shown in 1996, but there were some cited in 2004. Second, doctoral candidates usually cite document in English for their study. Statistics show that the use of resources in Japanese is on the decrease. Third, doctoral candidates in the discipline prefer materials published within 4-7 years, 8-11 years rather than 0-3 years since their publication. Last, journals indexed in SCI among the citation in dissertations are about 33 percent for both 1996 and 2004.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2015.10a
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• pp.143-146
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• 2015

A meta-analysis is a statistical integration method that delivers an opportunity to overview the entire result of integrating and analyzing many quantitative research results. This study will find meaningful mediator variables for criterion variables that affect between pre and post in metabolic syndrome studies, on the basis of the results of a meta-analysis. We reviewed a total of 36 studies related metabolic syndrome published in Korean journals between 2000 and 2015, where a cause and effect relationship is established between variables that are specified in the conceptual model of this study. In this meta-analysis, the path between pre and post in waist circumference showed the biggest effect size (r = .420). The second biggest effect size (r = -.402) was found the path between pre and post in high density lipoprotein cholesterol. By the way, one the smallest effect size (r = .234) was obtained the path between pre and post in diastolic blood pressure. Thus, we present the theoretical and practical implications of these results and discuss the differences between these results through a comparative analysis with previous studies.

• Spatial Information Research
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• v.9 no.2
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• pp.239-261
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• 2001

A large suite of official statistical data sets has been compiled for geographical units under the national directives, and it is the quantitative regional analysis procedures that could add values to them. This paper reports our attempts at prototyping a statistical GIS which is capable of serving over the Web a variety of regional analysis routines as well as value-added statistics and maps. A pilot database of some major statistical data was ingested for the city of Seoul. The baseline subset of regional analysis methods of practical usage was selected and accommodated into the business logic of the target system, which ranges from descriptive statistics, regional structure/inequality measures, spatial ANOVA, spatial (auto) correlation to regression and residual analysis. The leading-edge information technologies including the application server were adopted in the system design and implementation so that the database, analysis modules and analytic mapping components may cooperate seamlessly behind the Web front-end. The prototyped system supports tables, maps, and files of downloadable format for input and output of the analyses. One of the most salient features of out proposed system is that both the database and analysis modules are extensible via the bi-directional interface for end users; The system provides users with operators and parsers for algebraic formulae such that the stored statistical variables may be transformed and combined into the newly-derived set of variables. This functionality eventually leads to on-the-fly fabrication of user-defined regional analysis algorithms. The stored dataset may also be temporarily augmented by user-uploaded dataset; The extension of this form, in essence, results in a virtual database which awaits for users commands as usual. An initial evaluation of the proposed system confirms that the issues involving the usage and dissemination of information can be addressed with success.

• Journal of Korea Port Economic Association
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• v.27 no.2
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• pp.355-372
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• 2011

Various incentive policies for transshipment cargo have been enforced without any evaluation of the effectiveness. Therefore, the purpose of this study is to evaluate the effect of volume incentive on container transshipment cargo. To be different from previous studies, this study tries to quantitatively assess the incentive effects by using econometric techniques. The result derived from the ARIMA type models indicates that the total amount of the increased transshipment cargo during the last 7 years is about one million TEU. In the meanwhile, the multivariate long run equilibrium model implies that the increased transshipment cargo is less than 0.5 million TEU for the 7 years. Furthermore, the structural break tests indicate that the volume incentive does not change the model structures. It means that the effect of volume incentive is not statistically significant. Consequently, the test results conclude the effect of volume incentive on transshipment cargo is not significant although the volume of transshipment cargo is increased to some extent by volume incentive. Considering the magnitude of BPA's expenditure, we doubt the effectiveness of volume incentive. This study, therefore, encourages the port authority to research a more efficient way to induce transshipment cargo rather than focusing on only volume incentives.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.19 no.11
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• pp.2590-2596
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• 2015

A meta-analysis is a statistical integration method that delivers an opportunity to overview the entire result of integrating and analyzing many quantitative research results. This study will find meaningful mediator variables for criterion variables that affects between pre and post in the metabolic syndrome studies, on the basis of the results of a meta analysis. We reviewed a total of 36 studies related the metabolic syndrome published in Korean journals between 2000 and 2015, where a cause and effect relationship is established between variables that are specified in the conceptual model of this study. In this meta-analysis, the path between pre and post in the waist circumference showed the biggest effect size (r = .420). The second biggest effect size (r = -.402) was found the path between pre and post in the high density lipoprotein cholesterol. By the way, one the smallest effect size (r = .234) was obtained the path between pre and post in the diastolic blood pressure. Thus, we present the theoretical and practical implications of these results.

• Journal of Korean Society of Transportation
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• v.27 no.5
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• pp.85-95
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• 2009

Congestion on expressways is increasing in spite of continuous road construction. In enlargement of expressway capacity to lessen congestion, a long period is needed and in the case of traffic congestion, it would be impossible to avoid long periods of traffic congestion. So, it is necessary to cope with traffic congestion through continuous traffic condition monitoring, analysis of the causes of congestion and the development of alternatives before traffic conditions worsen. A congestion index that can express traffic operating conditions measurably is needed to monitor those conditions. Thus, in this research, a new congestion index, the Traffic Condition Index (TCI), is developed. TCI is able to evaluate roads that have different grades (or design speeds) and to judge traffic condition as good, fair and poor (congested). In addition, TCI has merits in that it can strengthen the function of existing Freeway Traffic Management Systems (FTMS) and can be applied to congestion management easily: TCI calculates congestion intensity and severity using data obtained from existing FTMS. In order to validate TCI, it was applied to the Kyungbu Expressway and the Seohaean Expressway. As a result, TCI shows a good performance in the aspect of applicability and ability of presentation of traffic conditions compared with travel speed and Travel Time Index (TTI).

• Korean Journal of Social Welfare Studies
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• no.37
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• pp.5-33
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• 2008

This study examines the use of medical care by the poor through analysing KNHANES III databases, and the focus of the study is on under-satisfaction of medical needs and the impact of the medicare system. The results of analysis are summerized as follows; the poor had generally suffered from poor health condition, and did not have economic resoure to satisfy the medical needs. But, the beneficiaries of the medicare used much more medical care than non-poor. The result of logistic regression suggest that the medicare affected significantly on increase of uses. Consquently, the medicare system effectively made up the lack of economic resoure of the poor. However, the Medicare did not sufficient to satisfy all the medical needs of the poor. Over 20% of the poor had experinced the abandonment of meical care uses, "the lack of econmic resource" was most important reason. The result of logistic regression suggest that all the poor such as Medicare I and Medicare II beneficiaries, and near-poor class had much more probabilities of giving up the use of medical care than non-poor. It is necessary to raise up the benefit level of the current medicare system such as the reduction of non-secured medical cost, the alleviation of user's burden etc.

• Proceedings of the Korea Water Resources Association Conference
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• 2015.05a
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• pp.276-276
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• 2015

농경지에서의 액비 수요는 최근 증가하고 있으나 적정 액비시비량에 대한 기준과 사후 관리에 대한 명확한 기준이 없어 환경문제에 대한 고찰이 필요하다. 본 연구에서는 시험포장을 선정하고 논에서의 질소 및 인의 동태를 모니터링하고, 관개수, 배출수 및 침투수 중 영양물질 및 중금속 잔류 특성을 분석하였다. 시험구는 대조구(화학비료 표준시비구, A)와 양돈분뇨액비 표준시비처리구(B)로 구성하였으며, 기상관측 측정을 위하여 자동기상관측기, 유입량은 수도미터계량기로 관측하였으며, 시험포장으로부터 유출량을 측정하기 위하여 압력식수위계를 각 처리구별로 설치하였다. 침투에 의한 영양물질의 유출부하량 평가를 위하여 침투계 1조 및 중금속 포집이 가능한 ceramic porus cup 4조를 각 처리구별로 설치하였다. 2014년 6월 9일 써래질 후, 6월 19일 $15{\times}30cm$, 1주 당 3본씩 "동진벼"를 기계이앙 실시하였고, 대조구 A는 농촌진흥청의 추천시비량, 처리구 B는 지상분무방식(액비시비 후 경운을 하는 방식 및 관개수 공급 후 액비를 시비하는 희석식)을 적용하였다. 기비 시비일은 6월 6일, 분얼비 시비일은 6월 26일, 수비 시비일은 7월 30일이었다. 강우량 대비 유출량 비인 유출률은 0.03에서 0.91까지 나타났으며, 담수의 수질조사는 평시 조사로 주 1회 실시하고 있으며, 분석결과는 SS의 경우 처리구 B가 상대적으로 높게 나타났다. 영양물질(T-N, T-P 등)의 경우는 대조구 A에서 꾸준히 높은 농도를 보여주고 있으며 이들 농도는 시비 시기에 따라 첨두값이 다르게 나타났다. 특히 $TH_3-N$의 경우 휘발성이 강하기 때문에 처리구 B에서 매우 낮은 값을 보여주었다. 유출수의 화학성분 분석결과는 완효성인 화학비료의 특징으로 전체적으로 대조구 A에서 수질농도가 높게 나타났으며, BOD의 경우는 처리구 B에서 높게 나타났다. 침투수의 T-N은 대조구 A에서 상대적으로 높은 값을 보여주고 있으며 이는 $TH_3-N$의 휘발에 영향을 받는 것으로 보이며, $NO_3-N$은 처리구 B에서 더 높게 나타나 토양중으로 침출되는 양이 많은 것으로 나타났다. 본 연구는 액비시용에 따른 농경지 위해성 평가와 관리방안 개발을 위한 1차년도의 연구 성과로서 지속적인 모니터링을 통하여, 향후 새만금 유역내 축산밀집지역에서 나타날 수 있는 축산분뇨 관리정책 개발의 기초자료로 활용될 것으로 기대한다.

• Korean Journal of Plant Resources
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• v.13 no.3
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• pp.162-170
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• 2000

This study quantified the effects of urban greenspace on microclimate amelioration and atmospheric $CO_2$ reduction for several residential districts selected in Korea and Japan. The study also explored fire obstruction by urban trees to develop systematic planting guidelines. Transpiration by a Zelkova serrata tree (diameter at breast height: 15 cm) in a day of August equaled cooling effect of about 3 air conditioners running for 12 hours. Average air temperature for the growing season was 0.5$^{\circ}C$ and 1.2$^{\circ}C$ cooler, respectively, in districts with 12% and 22% cover of woody plants than in a district with no vegetation. Annual $CO_2$ uptake and $O_2$ production by woody plants were 3 times greater in a district which was 2 times higher in their cover. Woody plants played, in a district with their 22% cover, an important role through offsetting total $CO_2$ emission from the district by about 3% annually, and through producing 10% of annual $O_2$ requirement by all residents within the district. Appropriate planning strategies of residential greenspace, including species selection, planting layout, greenspace enlargement, and maintenance were suggested to improve microclimate amelioration, air purification, and fire obstruction.

• Journal of the Korean Geographical Society
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• v.31 no.2
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• pp.106-127
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• 1996

In Korea, modern geomorphology has developed as one of main subjects in geography, such as in Europe. Geomorphology is one of the most advanced specialties in the geography dicipline, since foundation of Korean Geographical Society in 1945. Untill 1960's study, first generation of the Korean geomorphologists trained the younger ones, together with energetic research activities. Their great works in education and research established the base of ulterier development of the geomorphology in Korea. Since 1970s, research manpower and quality has incresed rapidly, partly due to the various international activities and cooperations of Korean geomorphologists. Owing to above development, Korean geomorphologist was able to found "The Geomorphological Association of Korea" in 1990 and publish "Journal of GAK", since 1994. Furthermore, geomorphologists are playing important roles in interdisciplinary academic societies, such as "The Korean Quaternary Assocition". Still 1960s, our research had focused on the identification and interpretation of erosional surfaces in Korea Peninsular. Of course, W.M. Davis's "Geographical Cycle Theory" and L.C. King's "Pedimentation Theory" had a great influence on the Koerans' works. After 1970s, the study of erosional surface played the important role in setting up the morphoclimatic viewpoint and methodology. Research scope tend to be notably broad and various than it was untill 1960's. Disposotion of the scientific methods and techniques become more and more apparent. These trends of research has settled precise descreption and interpretation of actual landforms, based on the careful field works, scientific measuring, and analisis, rather than methodology focused on the particular master theories. Recent geomorphological researches show the scope from climatic geomorphology and Quaternary geomorphology to granite and limestone weathering, pedo-geomorphogenic environment and periglacial landforms, focused on the small-to-medium scales. And then there have been new trying to interprete erosional surfaces such as hillslopes and terraces. Also, studies of coastal and plain landforms have been successfully developed. Recent new trends show the quantitative and analytic modelling using field measurement and laboratory work, and study on the human impacts on the natural landforms.y on the human impacts on the natural landforms.