http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : 김윤기 (검색결과 533 건)
- 무료
- 기관 내 무료
- 유료
-
-
-
-
생물개스 발생시스템을 위한 지하매설콘크리트 다이제스터의 열전달에 관한 연구
김윤기,고재균 한국농공학회 1980 한국농공학회논문집 Vol.22 No.1
The research work is concerned with the analytical and experimental studies on the heat transfer phenomenon around the underground concrete digester used for biogas production Systems. A mathematical and computational method was developed to estimate heat losses from underground cylindrical concrete digester used for biogas production systems. To test its feasibility and to evaluate thermal parameters of materials related, the method was applied to six physical model digesters. The cylindrical concrete digester was taken as a physical model, to which the model,atical model of heat balance can be applied. The mathematical model was transformed by means of finite element method and used to analyze temperature distribution with respect to several boundary conditions and design parameters. The design parameters of experimental digesters were selected as; three different sizes 40cm by 80cm, 80cm by 160cm and l00cm by 200cm in diameter and height; two different levels of insulation materials-plain concrete and vermiculite mixing in concrete; and two different types of installation-underground and half-exposed. In order to carry out a particular aim of this study, the liquid within the digester was substituted by water, and its temperature was controlled in five levels-35。 C, 30。 C, 25。 C, 20。C and 15。C; and the ambient air temperature and ground temperature were checked out of the system under natural winter climate conditions. The following results were drawn from the study. 1.The analytical method, by which the estimated values of temperature distribution around a cylindrical digester were obtained, was able to be generally accepted from the comparison of the estimated values with the measured. However, the difference between the estimated and measured temperature had a trend to be considerably increased when the ambient temperature was relatively low. This was mainly related variations of input parameters including the thermal conductivity of soil, applied to the numerical analysis. Consequently, the improvement of these input data for the simulated operation of the numerical analysis is expected as an approach to obtain better refined estimation. 2.The difference between estimated and measured heat losses was shown to have the similar trend to that of temperature distribution discussed above. 3.It was found that a map of isothermal lines drawn from the estimated temperature distribution was very useful for a general observation of the direction and rate of heat transfer within the boundary. From this analysis, it was interpreted that most of heat losses is passed through the triangular section bounded within 45 degrees toward the wall at the bottom edge of the digesten Therefore, any effective insulation should be considered within this region. 4.It was verified by experiment that heat loss per unit volume of liquid was reduced as the size of the digester became larger For instance, at the liquid temperature of 35˚ C, the heat loss per unit volume from the 0. 1m$^3$ digester was 1, 050 Kcal/hr m$^3$, while at for 1. 57m$^3$ digester was 150 Kcal/hr m$^3$. 5.In the light of insulation, the vermiculite concrete was consistently shown to be superior to the plain concrete. At the liquid temperature ranging from 15。 C to 350 C, the reduction of heat loss was ranged from 5% to 25% for the half-exposed digester, while from 10% to 28% for the fully underground digester. 6.In the comparison of heat loss between the half-exposed and underground digesters, the heat loss from the former was fr6m 1,6 to 2, 6 times as much as that from the latter. This leads to the evidence that the underground digester takes advantage of heat conservation during winter.
-
김윤기,강치원,정회경 한국정보통신학회 2002 한국정보통신학회논문지 Vol.6 No.6
정보통신기술이 발달함에 따라 무선 전자상거래가 활성화되고 있으나 이에 대한 정보가 논문, 보고서 등의 자료로 한정되고 있다. 그러나 최근 들어 전자상거래에 있어서 지적재산권의 중요성이 강조되는 시점에서 이에 대한 연구의 필요성이 크게 대두되고 있다. 이에 본 논문에서는 무선 전자상거래와 관련된 기술 동향 및 이에 관련된 지적재산권에 대해 분석하여 국내의 무선 전자상거래에 관련된 지적재산권 확보 방안 및 지적재산권에 대한 대응 방안을 도출하여 차세대 표준에서 지적재산권 확보를 위한 방향을 제시한다. According to progressing the If(Information Technology), Mobile Commerce have been activated. Hut all kind of theses information is limited in thesis and report. Recently importance of Intellectual Property Right is emphasized and it's very demanded to study for it. Therefore, this thesis will investigate a tendency about Mobile Commerce and Intellectual property Right which is related it. Then it will be presented the way for ensuring the Intellectual Property Right in next generation through seeking a way for guaranteeing Intellectual Property Right of Domestic.
-
-
김윤기,kim, Yun-Ki LX Spatial Information Research Institute 2018 지적과 국토정보 Vol.48 No.1
본 연구의 주된 목적은 LDA를 이용하여 국제지적연구의 주제와 연구추세를 확인하는 것이었다. 이러한 연구목적을 달성하기 위해 나는 LDA와 국제지적연구에 관한 선행연구를 검토하였고 이를 기반으로 4 개의 연구 질문을 설정하였다. 이러한 연구 질문에 답을 구하기 위해 나는 FIG Peer Review Journal에 2008년 1월1일 부터 2017년 10월 31일 사이에 발표된 370편의 논문들을 LDA를 이용하여 분석하였다. 분석의 결과 나는 국제지적연구에 12개의 주요 주제가 존재하고 있음을 확인하였다. 그리고 이러한 주제 중에 가장 영향력 있는 주제는 topic 2 (지적정보시스템)로 확인되었으며 또한 topic 5 (토지개발과 토지행정)도 전체 문서에서 중요한 역할을 수행하고 있는 주제로 파악되었다. 이두 주제는 지난 10년 동안 추세선이 매우 활발하게 움직인 가장 인기 있는 주제들로서 앞으로의 지적연구에서도 주도적인 역할을 수행할 것이 틀림없다. The main purpose of this study was to identify the topics and research trends of international cadastral research using LDA. To achieve this goal, I reviewed the literature on LDA and international cadastral study and formulated four research questions that are topics of cadastral researchers, distribution of topics, the most influential topics and changes of topics over time. To answer these research questions, I analyzed 370 papers published in the FIG Peer Review Journal between January 1, 2008, and October 31, 2017, using LDA. As a result of the analysis, I confirmed that there are twelve major topics in international cadastral research. And the most influential topic of these topics was identified as topic 2(cadastral information systems), and topic 5(land development and land administration) was also confirmed as playing an important role in the overall document. These two topics have been the most popular topics whose trendlines have been very active over the past decade and will play a leading role in future cadastral research.
-
Instagram 상에서 도시정부와 시민간의 상호작용에 관한 연구
김윤기 청주대학교사회과학연구소 2016 한국사회과학연구 Vol.37 No.2
The paper aims to describe and compare how different city governments use Instagram in their interaction with citizens. Based on the reviews of literature, the author developed six research questions regarding the interactive functions of Instagram. This author chose five city governments as his sample in order to find the answers to those research questions because they posted more pictures and videos than others. All the pictures and videos that were posted between June 1, 2015 and July 31, 2015 by five city governments were collected and examined. Both a descriptive analysis and a comparative analysis were conducted for the collected data. The study results showed that there were substantial variations in the average number of comments per posting, the average number of likes per posting, and the average number of hashtags per posting city governments use in their interaction with citizens. However, it was revealed that there were little differences in the percentage of videos and the level of interaction. Therefore, the answers to four research questions turned out to be positive, and the answers to the remainder proved to be negative or neutral. This study on interaction on Instagram space has some limitations such as small sample size, and small data size. Finally, based on the results of the research, the author suggested several steps for improving interaction with citizens through Instagram. 본 연구의 주된 목적은 도시정부들이 시민과의 상호작용증진을 위해 Instagram을 어떻게 활용하고 있는지를 기술하고 비교하는 것이었다. 이러한 연구목적을 달성하기 위해 본 연구에서는 인스타그램을 활용한 상호작용에 관한 이론과 선행연구를 검토하였고, 이를 토대로 6개의 연구질문들을 설정하여 이들에 대한 답을 구하였다. 분석결과 연구자가 설정한 6개의 연구질문 중 4개(게시물 당 평균 댓글의 수, 평균‘좋아요’수, 평균 해시태그의 수, 평균 언급의 수)에 관해서는 긍정적인 답을, 게시물중 동영상의 비율에 관한 연구질문에 관해서는 부정적인 답을 그리고 시민과 도시정부간의 상호작용수준에 관한 연구질문에 관해서는 중립적인 답을 구할 수 있었다. 이러한 연구결과에 비춰볼 때 인스타그램상에서 도시정부와 시민간의 상호작용수준은 도시정부마다 상당한 차이를 보이고 있음을 알 수 있었다. 본 연구의 결과는 인스타그램상에서 도시정부와 시민간의 상호작용수준을 파악하는데 있어서 유용하게 활용될 수 있을 것이다. 그러나 본 연구는 위와 같은 독창성과 유용성에도 불구하고 표본과 데이터의 규모가 작고, 인스타그램의 상호작용기능 중 일부만을 연구범위에 포함시킨 것 등의 몇 가지 한계를 지니고 있었다. 이러한 한계들은 향후 빅데이터 분석기법을 활용하면 극복이 가능할 것으로 사료된다.
-
-
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
