• Journal of Food Hygiene and Safety
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• v.7 no.1
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• pp.49-52
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• 1992

A Liquid Chromatogaphic Method was applied to analyze the following nine preservatives used for foods simultaneously; propionic acid, sorbic acid, benzoic acid, dehydroacetic acid, ethyl p-hydroxy benzoate, propyl p-hydroxy benzoate, i-butyl p-hydroxy benzoate, butyl p-hydroxy benzoate, ethyl salycilate. A cosmosil $5C_{I8}$ was used and 1% phosphoric acid-acetonitrile (60 : 40) was used as the mobile phase. Pretreatment of the food sample with steam distillation improved the resolution of peaks at 220 nm.

• Proceedings of the Korean Society for Information Management Conference
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• 2016.08a
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• pp.15-18
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• 2016

전 세계적으로 부는 한류열풍으로 인해 우리나라에 대한 관심이 증대되고 있으며 이에 따른 한류 관련 연구의 수 또한 증가하고 있다. 따라서 본 연구에서는 한류 연구의 핵심 문헌을 선정하고 이를 대상으로 동시인용 분석을 수행하여 한류 연구의 지적구조를 파악하고자 하였다. 이를 위하여 KCI 인용 데이터베이스에서 국내 한류 연구 문헌 116건과 2,042건의 인용정보를 수집하였다. 문헌동시인용기법을 활용하여 분석한 결과 한류 연구 영역을 한류의 파급효과와 영향력 관련 영역, 한류의 정체성 관련 영역으로 2개의 대군집과 5개의 중군집으로 구분 지을 수 있었다.

• Proceedings of the Korea Information Processing Society Conference
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• 2023.05a
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• pp.670-672
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• 2023

본 논문에서는 소셜 미디어 약물 리뷰 데이터로부터 약물 이상 반응을 탐지하는 모델인 FC-BERT 를 기반으로 소셜 네트워크 분석을 활용하여 웹 애플리케이션을 구현하였다. FC-BERT 모델을 거쳐 나온 개체명 인식 결과 중에 같은 의미를 가진 서로 다른 약물 이상 반응 표현들을 MedDRA 부작용 사전을 참고하여 하나의 MedDRA 용어로 표준화하여 매핑했다. 해당 결과에 소셜 네트워크 분석 기법을 적용하여 생성한 상위 15 개의 ADR 동시 출현 그래프를 상위 30 개의 워드 클라우드와 함께 시각화하여 보여주는 웹 애플리케이션을 개발했다. 동시 출현 그래프는 가장 많은 리뷰에서 동시에 나타나는 ADR 쌍을 보여준다. 본 논문에서 제안한 웹 애플리케이션은 사람마다 다르게 나타나는 다양한 약물 이상 반응을 사용자에게 좀 더 접근성이 좋게 제공할 수 있을 것으로 보인다.

• Journal of the Korean Society for information Management
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• v.24 no.4
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• pp.73-96
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• 2007

In this study, the characteristics of scholarly communication through the Web and scientific journals are explored, and scholarly communication patterns in two scientific disciplines are compared to reveal the difference. Economics and Computer Science-Information Systems are selected as two disciplines to be analyzed. In the data collection process, 10 keywords are extracted from a database for each subject field, and scholarly Web pages and journal articles related to these keywords are collected and analyzed. Our investigation includes the characteristics of scholarly Web pages, Multi-Dimensional Scaling (MDS) analysis of co-linked Web pages as well as co-cited journal articles, and changes in the scholarly communication activities occurring on the Web and in scientific journals respectively over time. We found certain differences as well as common features in scholarly communication patterns between the Web and scientific journals for both fields of Economics and Computer Science. We also found that scholarly communication occurring on the Web displays unique features for each subtopic within the same field of study.

• Korean Journal of Food Science and Technology
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• v.37 no.6
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• pp.1024-1027
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• 2005

Rapid and simple method was developed for simultaneous determination of vitamins $D_3\;and\;K_1$ contents in infant formula. Contents of vitamins $D_3\;and\;K_1$, extracted by column-switching HPLC with reversed phase column using enzymatic hydrolysis and organic solvent, in CRM determined by developed method were within certified ranges of standard values.

• Environmental and Resource Economics Review
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• v.15 no.3
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• pp.479-504
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• 2006

This paper analyzes a price discovery process for international crude oils including the WTI, Brent and Dubai. Error correction model is employed considering non-stationarity property of crude oil price and the contemporaneous causality is constructed by graph theory to analyze the short-term causality. The empirical analysis for January 4., 1999 to July 15., 2005 reveals that the Brent price interconnects between the WTI price and the Dubai price. This result implies the substantial influence of the Brent price as a marker oil.

• Journal of the Korean Society for Nondestructive Testing
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• v.35 no.1
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• pp.31-38
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• 2015

Intelligent leak detection is an essential component of a underground water supply pipeline network such as a smart water grid system. In this network, numerous leak detection sensors are needed to cover all of the pipelines in a specific area installed at specific regular distances. It is also necessary to determine the existence of any leaks and estimate its location within a short time after it occurs. In this study, the leak signal properties and feasibility of leak location detection were investigated when concurrent leaks occurred at two points in a pipeline. The straight distance between the two leak sensors in the 100A sized cast-iron pipeline was 315.6 m, and their signals were measured with one leak and two concurrent leaks. Each leak location was described after analyzing the frequency properties and cross-correlation of the measured signals.

• Journal of the Korean Society for Library and Information Science
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• v.55 no.3
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• pp.103-129
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• 2021

This study examined the characteristics of two keyword types expressing the topics in the intellectual structure analysis based on the co-word analysis, focused on overseas open access field. Specifically, the keyword set extracted from the LISTA database in the field of library and information science was divided into two types (controlled keywords and uncontrolled keywords), and the results of performing intellectual structure analysis based on co-word analysis were compared. As a result, the two keyword types showed significant differences by keyword sets, research maps and influences, and periods. Therefore, in intellectual structure analysis based on co-word analysis, the characteristics of each keyword type should be considered according to the purpose of the study. In other words, it would be more appropriate to use controlled keywords for the purpose of examining the overall research trend in a specific field from the perspective of the entire academic field, and to use uncontrolled keywords for the purpose of identifying detailed trends by research area from the perspective of the specific field. In addition, for a comprehensive intellectual structure analysis that reflects both viewpoints, it can be said that it is most desirable to compare and analyze the results of using controlled keywords and uncontrolled keywords individually.

• Proceedings of the Korean Vacuum Society Conference
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• 2016.02a
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• pp.85.1-85.1
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• 2016

현대 과학기술에는 표면/계면 및 나노물질의 구조와 물성을 분석하는 다양한 방법들이 존재한다. 이들 분석장비들의 분해능과 감도의 향상으로 이전에는 보지 못한 물성들이 속속 발견되고 있다. 이러한 흐름 속에서 분석장비들의 다기능 시대가 열리고 있다. 예전에는 성분, 형태, 구조, 전자구조 등을 분석하기 위해 각각에 해당하는 분석장비들이 동원되었다. 하지만 21세기에 접어들어 분석장비들이 두 종류 이상의 분석이 가능하도록 개발되었다. 예를 들면, TEM으로 형태를 보는 것 외에도 TED와 EELS로 구조와 성분을 동시에 확인할 수 있게 되었다. 전통적인 성분 및 전자구조 분석법의 하나인 광전자분광법도 microscopy 기능을 탑재하는 변신이 있었다. 본 발표에서는 빛과 전자를 시료에 조사하여 물질의 성분, 형태, 구조, 전자구조 등을 동시에 분석이 가능한 분석법들에 대해 소개하고자 한다. 그 중, SPEM(Scanning Photoelectron Emission Microscopy)은 포항가속기연구소에 설치되어 있으며, PEEM(Photoelectron Microscopy)과 LEEM(Low Energy Electron Microscopy)은 수차보정장치를 갖춘 사양으로 최근 한국기초과학지원연구원에 설치되었다. 위에 언급한 장비를 활용하여 얻은 데이터를 바탕으로 나노물질의 표면 및 계면의 특성을 분석하는 방법 및 최근 연구 결과를 소개하고자 한다.

• Asia-Pacific Journal of Business Venturing and Entrepreneurship
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• v.17 no.3
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• pp.245-256
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• 2022

The purpose of this study is to provide comprehensive insights on the current research trends in entrepreneurship based on topic modeling and keyword co-occurrence analysis. This study queried Web of Science database with 'entrepreneurship' and collected 14,953 research articles between 2002 and 2021. The study used R program for topic modeling and VOSviewer program for keyword co-occurrence analysis. The results of this study are as follows. First, as a result of keyword co-occurrence analysis, 5 clusters divided: entrepreneurship and innovation cluster, entrepreneurship education cluster, social entrepreneurship and sustainability cluster, enterprise performance cluster, and knowledge and technology transfer cluster. Second, as a result of the topic modeling analysis, 12 topics found: start-up environment and economic development, international entrepreneurship, venture capital, government policy and support, social entrepreneurship, management-related issues, regional city planning and development, entrepreneurship research, and entrepreneurial intention. Finally, the study identified two hot topics(venture capital and entrepreneurship intention) and a cold topic(international entrepreneurship). The results of this study are useful to understand current research trends in entrepreneurship research and provide insights into research of entrepreneurship.