• Communications for Statistical Applications and Methods
• /
• 제22권3호
• /
• pp.209-222
• /
• 2015

Time series are used in many studies for model building and analysis. We must be very careful to understand the kind of time series data used in the analysis. In this review article, we will begin with some issues related to the use of aggregate and systematic sampling time series. Since several time series are often used in a study of the relationship of variables, we will also consider vector time series modeling and analysis. Although the basic procedures of model building between univariate time series and vector time series are the same, there are some important phenomena which are unique to vector time series. Therefore, we will also discuss some issues related to vector time models. Understanding these issues is important when we use time series data in modeling and analysis, regardless of whether it is a univariate or multivariate time series.

• Journal of Preventive Medicine and Public Health
• /
• 제56권4호
• /
• pp.303-311
• /
• 2023

Traditional mediation analysis, which relies on linear regression models, has faced criticism due to its limited suitability for cases involving different types of variables and complex covariates, such as interactions. This can result in unclear definitions of direct and indirect effects. As an alternative, causal mediation analysis using the counterfactual framework has been introduced to provide clearer definitions of direct and indirect effects while allowing for more flexible modeling methods. However, the conceptual understanding of this approach based on the counterfactual framework remains challenging for applied researchers. To address this issue, the present article was written to highlight and illustrate the definitions of causal estimands, including controlled direct effect, natural direct effect, and natural indirect effect, based on the key concept of nested counterfactuals. Furthermore, we recommend using 2 R packages, 'medflex' and 'mediation', to perform causal mediation analysis and provide public health examples. The article also offers caveats and guidelines for accurate interpretation of the results.

• 한국분무공학회지
• /
• 제21권4호
• /
• pp.223-236
• /
• 2016

On-road source emissions are major air pollutants and have been associated with serious health effects in Seoul metropolis. Thus, it is of fundamental importance to have an accurate assessment of vehicle emissions in order to implement an effective air quality management policy. As a result, there is a need to overview vehicle emission characteristics of air pollutants. This article discusses vehicle exhaust sampling and chemical analysis, emission characteristics of air pollutants, and emission regulations from passenger cars. The vehicle exhaust sampling and chemical analysis methods were described in particulate matter and gaseous compounds. In this article, chassis dynamometer, measurement instrumentation for nano-particulate matter and carbon compounds analysis device were described. For the gasoline and diesel vehicles, the effective parameters of emissions were average vehicle speed, vehicle mileage and model year. The particle number emissions for diesel nano-particles were sensitive to the sampling conditions. Also, the particle number emissions with a diesel particle filter (DPF) largely reduced rather than those without it. This article also describes different emission characteristics of air pollutants according to biodiesel or bioethanol mixing ratio. The Korean emission standards for passenger cars were compared with those of the US and EU. Finally, the objective is to give an overview of relevant background information on emission characteristics of air pollutants from passenger cars in Korea.

• 해양환경안전학회지
• /
• 제16권4호
• /
• pp.415-420
• /
• 2010

본 연구는 해양환경 및 해양안전과 관련하여 우리나라의 대표적 학술지라고 할 수 있는 "해양환경안전학회지"의 게재 논문을 대상으로 해양환경 및 해양안전에 관한 연구들의 경향을 분석하고자 하였다. 그리고 연구경향을 분석하기 위한 분석기준으로 해양환경안전학회의 학문적 구성을 고려하여 연구자의 소속, 연구자의 지역성, 연구 참여형태, 논문의 학제성, 논문의 연구방법, 논문의 연구영역 등으로 한정하여 연구경향을 분석하였다.

• 한국유기농업학회지
• /
• 제22권4호
• /
• pp.549-559
• /
• 2014

To investigate the technology trends in organic farming using journal article analysis, total 2,378 published articles in organic farming between 1974 and 2014 were analyzed. The number of the articles published in organic farming has been steadily increased since 2006. As for category, articles in the field of producing the safe organic products and management (A) were published relatively dominantly, especially division of nutrient and soil management (AA). In the foreign countries, lots of articles in environmental assessment and safety field (B) were published than Korea. the main institutes published the articles in organic farming were Swedish University, Sweden and US department of Agriculture, USA. In case of Korea, the articles in the field of environmental assessment and safety (B) were relatively merely published, especially division of environment in organic farming (BA). With this study, more research based on the environment and safety fields in organic farming should be focused on.

• Restorative Dentistry and Endodontics
• /
• 제44권1호
• /
• pp.2.1-2.6
• /
• 2019

Objectives: The purpose of this research was to identify the top 10 most-cited articles on the management of fractured or broken instruments and to perform a bibliometric analysis thereof. Materials and Methods: Published articles related to fractured instruments were screened from online databases, such as Web of Science, Scopus, PubMed, and ScienceDirect, and highly cited papers, with at least 50 citations since publication, were identified. The most-cited articles were selected and analysed with regard to publication title, authorship, the journal of publication, year, institution, country of origin, article type, and number of citations. Results: The top 10 most-cited articles were from various journals. Most were published in the Journal of Endodontics, followed by the International Endodontic Journal, and Dental Traumatology. The leading countries were Australia, Israel, Switzerland, the USA, and Germany, and the leading institution was the University of Melbourne. The majority of articles among the top 10 articles were clinical research studies (n = 8), followed by a basic research article and a non-systematic review article. Conclusions: This bibliometric analysis revealed interesting information about scientific progress in endodontics regarding fractured instruments. Overall, clinical research studies and basic research articles published in high-impact endodontic journals had the highest citation rates.

• Journal of Trauma and Injury
• /
• 제28권3호
• /
• pp.182-189
• /
• 2015

Purpose: We performed a quantitative and qualitative analysis in the Journal of the Korean Society of Traumatology (JKST) by Bibliometrics to know the trends of articles. Methods: We reviewed articles in the JKST retrospectively through 1988 to 2014. Articles were classified into original articles, case reports, review articles, and also it is further classified as topics and the information related to the Department of Medicine of corresponding author. Original article was classified prospective and retrospective studies. Results: 753 studies and average of 27.9 studies per year were posted on JKST. 576 original articles (76.5%) were posted. Retrospective studies around 449 studies (78%) were posted and there were about 35 descript studies and 541 analytic studies. The most common themes were related to abdominal trauma, 144 pieces, 95 pieces following damage to the chest and the 84 pieces of special order of trauma. Emergency department had the highest case whereas general surgery came to the second place. Conclusion: Recently, there has been reduced proportion of original article in JKST. It was not possible to evaluate the Korea Citation index journals due to the fact that it does not correspond to listed register Journal of National Foundation of Korea. There will be the need for the effort to improve the maintenance of the posted article number, as well as the qualitative development of the posted articles.

• 한국중재학회지:중재연구
• /
• 제14권2호
• /
• pp.73-106
• /
• 2004

The UNCITRAL Arbitration Working Group began its deliberations on the topic of interim measures of protection at its thirty-second session (Vienna, 21-30 March 2000), when the Working Group expressed general support for a legal regime governing enforcement of interim measures of protection ordered by the arbitral tribunal. Also the Working Group took a preliminary analysis of whether there was a need for a uniform rule on court-ordered interim measures of protection in support of arbitration. The Working Group agreed, at its thirty-third session (Vienna, 20 November-1 December 2000), that the proposed new article to the UNCITRAL Model Law on International Commercial Arbitration on enforcement of interim measures of protection (tentatively numbered article 17 bis) should include an obligation on courts to enforce interim measures if prescribed conditions were met. At its thirty-fourth session (New York, 21 May-1 Jun 2001), in addition to continuing its review of draft article 17 bis, the Working Group proceeded to consider a text revising article 17 of the UNCITRAL Model Law, which defined the scope of an arbitral tribunal's power to order interim measures and included an additional provision on the granting of interim measures on an ex parte basis. Discussions in relation to revised drafts of article 17 and 17 bis of the UNCITRAL Model Law have continued at the fortieth session ( New York, 23-27 February 2004). Article 17 of the UNCITRAL Model Law provides that the arbitral tribunal may order any party to take such interim measure of protection as the arbitral tribunal may consider necessary in respect to the subject matter of the dispute. However it may be noted that the article does not deal with enforcement of such measures.

• 통상정보연구
• /
• 제15권1호
• /
• pp.287-307
• /
• 2013

각 국가의 부패행위방지를 위한 제도적 혹은 법적인 노력은 국내차원을 넘어서 국제통상과 국제비즈니스에서도 지속적으로 증가하고 있다. 그 대표적인 예가 미국의 연방법인 해외부패방지법(FCPA)이다. 지난 10년간 미 법무부는 해외부패방지법의 관할권을 끊임없이 확장하여 이제는 미국증권거래소에 등록된 한국기업도 그 영역 안에 들어가게 되었다. 또 다른 예는 투명성을 다룬 한미 FTA 협정문 제 21 장중에서 특히 부패방지에 대한 조항인 제 21.6 조다. 한미 FTA로 인해 우리 기업의 대미수출뿐만 아니라 미국 내 법인설립 및 대미투자도 크게 증가할 것을 예상하면 앞으로 더 많은 한국 기업이 미국 해외부패방지법이나 한미 FTA 제 21.6 조의 관할권에 들어갈 것으로 전망된다. 미국 해외부패방지법과 한미 FTA 제 21.6 조는 부패방지라는 공통된 목적이 있으나 그 내용에 있어서 유사점과 차이점을 보인다. 따라서 본 연구는 두 가지 법을 비교분석하여 우리 기업의 부패행위방지를 위한 가이드라인의 초석 마련에 기여하는 것에 그 목적을 둔다.

• 한국컴퓨터정보학회논문지
• /
• 제29권6호
• /
• pp.13-22
• /
• 2024

기사성광고의 필요성과 긍정적인면도 존재하나, 일부 무분별한 '기사성 광고'로 인하여 과장되고 위장된 정보를 전달함에 따라 독자들은 일반기사와 기사성 광고의 구별이 어려움에 따라 많은 정보의 오인과 혼란을 하고 있다. 독자들은 앞으로도 계속 새로운 정보를 획득하고 이러한 정보를 적재적소에 적용하여 많은 가치를 가져와야 하기에, 정확한 일반기사와 기사성 광고를 식별하는 것이 더욱이 중요하다고 판단된다. 따라서 일반기사와 기사성 광고의 구별된 정보를 필요로 하기에, 이러한 일환으로, 인터넷신문에서 이러한 무분별한 기사성 광고로 인한 정확한 정보식별의 어려움이 많은 독자들을 위해, 본 논문에서는 IT기술과 AI기술을 접목한 시스템측면에서 해결할 수 있는 방법을 제시하고자 하였으며, 이러한 방법은 광고성 키워드를 찾아내어 정제해주는 지식기반 자연어처리 방법과 딥러닝기술을 이용한 기사성 광고를 추출하고자 설계 하였다.