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IEEE EPEC 발표논문 - 500kV 전력망 연계선 송전용량 증가를 위한 직렬콘덴서 적용 현황

  • 대한전기협회
    • JOURNAL OF ELECTRICAL WORLD
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    • pp.68-77
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    • 2012
  • 2011년 캐나다 온타리오 송전선로에 전력연계장치의 송전용량을 증가시켜 온타리오주 내의 송전전력 요구증대에 부응하기 위한 목적으로 2개의 500kV 직렬콘덴서를 도입하였다. 직렬콘덴서와 함께 보호개념 및 기술이 크게 한 단계 진전된 새로운 고속보호장치(FPD)를 설치하였다. 본 논문에서는 이러한 설계 내용뿐만이 아니라 직렬콘덴서의 두드러진 기타 설계특성을 언급하고 또한 전력계통 기능에 대한 이들 장치의 장점을 강조하고자 한다. 특히 기존의 선로차단기에 대한 과도회복전압의 제한특성을 강조하고 또한 부적절하게 연계된 장거리 가공선로에 대한 직렬콘덴서 설계의 영향에 대해서도 언급한다.

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SNS Big-data Analysis and Implication of the Marine and Fisheries Sector (해양수산 SNS 빅데이터 분석 결과 및 시사점)

  • Park, Kwangseo;Lee, Jeongmin;Lee, Sunryang
    • Journal of the Korean Society for Marine Environment & Energy
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    • v.20 no.2
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    • pp.117-125
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    • 2017
  • SNS Big-data Analysis means to find potential value from big data which has produced by the social media. In this paper, SNS Big-data has been analysed to find Korean concerns by using 24 key words from the marine and fisheries sector. Among 24 key words, seafood, shipping and Dokdo Island are the most mentioned ones. Some key words such as ocean policies and marine security that have less concerns have bess mentioned less. Also, key words that are led by government are mostly mentioned by news media, but key words that are led by private sector and have intimate relationship with people's lives are mostly mentioned by Blogs and Twitters. Therefore, reflecting close national concerns by SNS Big-data Analysis and especially resolving negative factors are the most significant part of the policy establishment. Also, differentiated promotion methods need to be prepared because the frequency of key words mentioned from each type of media are different.

A Study on the Strategic Plan for Honam Sea Grant College Program (호남지역 Sea Grant 사업단의 발전방향에 관한 연구)

  • Nam, Taek-Kun;Lee, Don-Chool;Yim, Jeong-Bin
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.13 no.3
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    • pp.183-189
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    • 2007
  • In this paper, the strategic plan for Honam Sea Grant College Program will be discussed. The main activity area of Hanam SGCP is research and development, education and public information, outreach. Honam SG theme areas and priorities of its activity area will be determined to enhance the sustainable use and conservation of marine and fishery resources for Honam region. In the education and public information, marine education program executed by MOMAF and relative institutions is introduced and suitable program direction will be suggested. The network composition between HSGCP and other institution in domestic or abroad is also tackled. An interchange of beneficial information is accomplished through the effective network with other organizations. Finally the result of survey to develop the pending problems of Honam area will be discussed.

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Content Analysis of YouTube Vidoes Regarding Heated Tobacco Products: Focus on Product and Health Harm Information, and Creator Characteristics (궐련형 전자담배 YouTube 동영상 내용 분석: 제품 및 건강 유해성 정보, creator 특성을 중심으로)

  • Choi, Youjin
    • The Journal of the Korea Contents Association
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    • v.19 no.12
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    • pp.389-397
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    • 2019
  • As the usage of e-cigarettes and its effects on health harms receive attentions, the debate over regulating e-cigarette industry's' social media marketing has been heated. While the industry has aggressively employed social media marketing such as YouTube, little research has examined what kinds of e-cigarette information is delivered to Korean viewers through YouTube. This study investigated the presence of product-related information and health harm information in the videos, and the characteristics of YouTube creators. The proportion of female creators was smaller than male creators, but more than female smoking rates. The results showed that product-related information such as taste, design and convenience was mentioned more than half the videos, but health ham was mentioned less. Videos which mentioned convenience and design tended to not mention health harm. These results could be used to support the current regulation approach over e-cigarette YouTube marketing.

Global Relation Extraction for Documents: Regarding Omitted Entities (문서 내 전역 관계 추출: 생략된 개체의 고려)

  • Kim, Kuekyeng;Kim, Gyeongmin;Jo, Jaechoon;Lim, Heuisoek
    • Annual Conference on Human and Language Technology
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    • pp.47-49
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    • 2018
  • 최근 존재하는 대부분의 관계 추출 모델은 언급 수준의 관계 추출 모델이다. 이들은 성능은 높지만, 문서에 존재하는 다수의 문장을 처리할 때, 문서 내에 주요 개체 및 여러 문장에 걸쳐서 표현되는 개체간의 관계를 분류하지 못한다. 이는 높은 수준의 관계를 정의하지 못함으로써 올바르게 데이터를 정형화지 못하는 중대한 문제이다. 해당 논문에서는 이러한 문제를 타파하기 위하여 여러 문장에 걸쳐서 개체간의 상호작용 관계도 파악하는 전역 수준의 관계 추출 모델을 제안한다. 제안하는 모델은 전처리 단계에서 문서를 분석하여 사전 지식베이스, 개체 연결 그리고 각 개체의 언급횟수를 파악하고 문서 내의 주요 개체들을 파악한다. 이후 언급 수준의 관계 추출을 통하여 1차적으로 단편적인 관계 추출을 실행하고, 주요개체와 관련된 관계는 외부 메모리에 샘플로 저장한다. 이후 단편적 관계들과 외부메모리를 이용하여 여러 문장에 걸쳐 표현되는 개체 간 관계를 알아낸다. 해당 논문은 이러한 모델의 구조도와 실험방법의 설계에 대하여 설명하였고, 해당 실험의 기대효과 또한 작성하였다.

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Relationship of molecular structure and aroma characteristic (분자구조와 향특성과의 관계)

  • Baek, Shin;Jang, Seok-Su;Kim, Kun-Soo
    • Journal of the Korean Society of Tobacco Science
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    • v.31 no.2
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    • pp.115-120
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    • 2009
  • 향료산업은 화학의 발전과 더불어 번창하였다. 초기에는 시나믹 알데하이드, 바닐린 등과 같은 합성 원료가 제조 되었으며 그 후 장미 천연향의 구성 성분인 메틸 아이오논이 합성되었고 점차 더 섬세하고 지속성이 강하며 안정성 및 확산성이 좋은 신규향료 개발로 연구가 진행되었다. 점차 미량으로도 충분한 향을 발현할 수 있는 향 강도가 강한 향료 개발이 가속화 되었다. 특히 최근에는 GC-MS와 GC-Olfactometry 기술의 발전에 따라 천연물에 존재하는 화합물의 확인이 더 용이해 지면서 향 화학자들의 연구 영역이 점점 더 확대되고 있다. 본 논문에서는 담배에 사용되는 케미칼 향의 분자 골격 또는 골격에 다양한 곁가지로 유도체를 합성함으로써 분자구조에 따른 향 특성 변화에 대해 논의 하였다. 세계적으로 점차 담배에 사용되는 향의 종류가 감소되는 추세에서 동일한 향 계열 중 본 논문에서 언급된 다양한 향을 적절히 선택하여 대체 사용함으로써 첨가제의 축소 및 감소에 많은 도움이 되리라 생각된다. 우선 단맛(sweet)을 내는 물질에 대해 논하는데 이 부분은 상당히 광범위하다. 그래서 단맛의 대표적인 열대과일 향과 쵸코렛 향에 대해 먼저 언급하고, 다음으로 구수한 스모키 향과 팝콘향, Cooling하고 Fresh한 향 특징을 주는 멘솔 유도체 향, 과일 향, 버섯 향, 꽃 향, 스파이스한 향 등에 대해 언급하였다.

Reexamination on V. L. Komarov's collection sites in North Korea (II) - mainly based on Nakai's Flora Koreana vol. II - (V. L. Komarov의 북한(北韓) 채집지명(採集地名)에 대한 연구(硏究) (II) - T. Nakai의 Flora Koreana vol. II를 중심으로 -)

  • Chang, Chin-Sung;Choi, Byoung-Hee
    • Korean Journal of Plant Taxonomy
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    • v.34 no.1
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    • pp.37-41
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    • 2004
  • T. Nakai, who wrote Flora of Koreana vol. II in 1911, cited V. L. Komarov's collections and listed more than 120 specimens with ca. 65 localities. All collection sites cited were described in the Romanized characters based on the Russian pronunciation. Therefore, it is very difficult to pinpoint those sites using the current or old version of Korean map. From this study, many names were reviewed based on other studies (both the Russian version and the Japanese translated version) and records (e.g. specimen label) and presented based on the current provinces with local names, the Chinese character, the GPS data and the first page of citation.

The Study on the Software Educational Needs by Applying Text Content Analysis Method: The Case of the A University (텍스트 내용분석 방법을 적용한 소프트웨어 교육 요구조사 분석: A대학을 중심으로)

  • Park, Geum-Ju
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.20 no.3
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    • pp.65-70
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    • 2019
  • The purpose of this study is to understand the college students' needs for software curriculum which based on surveys from educational satisfaction of the software lecture evaluation, as well as to find out the improvement plan by applying the text content analysis method. The research method used the text content analysis program to calculate the frequency of words occurrence, key words selection, co-occurrence frequency of key words, and analyzed the text center and network analysis by using the network analysis program. As a result of this research, the decent points of the software education network are mentioned with 'lecturer' is the most frequently occurrence after then with 'kindness', 'student', 'explanation', 'coding'. The network analysis of the shortage points has been the most mention of 'lecture', 'wish to', 'student', 'lecturer', 'assignment', 'coding', 'difficult', and 'announcement' which are mentioned together. The comprehensive network analysis of both good and shortage points has compared among key words, we can figure out difference among the key words: for example, 'group activity or task', 'assignment', 'difficulty on level of lecture', and 'thinking about lecturer'. Also, from this difference, we can provide that the lack of proper role of individual staff at group activities, difficult and excessive tasks, awareness of the difficulty and necessity of software education, lack of instructor's teaching method and feedback. Therefore, it is necessary to examine not only how the grouping of software education (activities) and giving assignments (or tasks), but also how carried out group activities and tasks and monitored about the contents of lectures, teaching methods, the ratio of practice and design thinking.

A Study on the Research Trend of Counter-Terrorism: Focusing on Counter-Terrorism studies of the National Police Headquarters (대(對)테러리즘 분야 연구경향분석:치안본부 대테러연구를 중심으로)

  • Lee, Dae sung;Ryu, Sang Il
    • Convergence Security Journal
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    • v.14 no.3_2
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    • pp.83-91
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    • 2014
  • International society got a severe shock from terrorism of hostage, abduction and murder that was committed on a target of Israel athlete delegation in Munich Olympics, West Germany by Black September, a Palestine terrorism organization. Korea with 1986 Asian Games and 1988 Olympics ahead was directly and indirectly exposed to threats of North Korea's nation-support terrorism, a military provocation and a local war limited warfare. This study explores the roles of the police at the time of the National Police Headquarters with regard to counter-terrorism, and analyzed academic research trends of Studies of Counter-terrorism published by the same office between 1983 and 1990. Looking into them shows a fact firstly, that the most frequently appearing key words in common were "terrorism," "hostages," "measures," and "international," etc. Secondly, before and after 1988 Olympics, the key word "Olympics" was frequently addressed. Thirdly, looking at the difference by the year, the key word, "policies of defense and borderlands" was frequently addressed between 1983 and 1984, "terrorism against South Korea," and "civil aircraft" frequently addressed in 1985, and "corporate" in 1986. In 1987, the key word "terrorism trends" was addressed, and in 1990, "international terrorism," and "separatism" were used.