백색침출수 용출지역의 수리지질학적 고찰

김만일 ( Man Il Kim ),박영규 ( Young Gyu Park ),김을영 ( Eul Young Kim ),김양빈 ( Yang Bin Kim ),용환호 ( Hwan Ho Yong ),지원현 ( Won Hyun Ji ) 대한지질공학회 2010 지질공학 Vol.20 No.4

본 연구는 백색침출수 용출구간에 대한 수리지질학적 특성을 파악하기 위한 목적으로 수행되었다. 이를 위하여 지표지질조사를 통해 지질특성을 분석하였으며, 백색침출수 용출구간의 지질구조를 파악하기 위한 전기비저항탐사와 시추공 공내촬영을 통해 암반의 불연속면 분포특성을 분석하였다. 연구지역 내 백색침출수 용출지점을 중심으로 갈수기와 풍수기로 구분하여 강우사상에 따른 지하수위 변동을 시추공별로 측정하였다. 이상의 연구결과에서 백색침출수 용출구간에서의 전기비저항특성은 비용출구간에 비해 상대적으로 낮은 값으로 나타났으며, 이는 심부에 파쇄대 내지 석회암 공동대의 존재를 확인하였다. 이들 지역에서의 강우사상에 따른 지하수위 변동을 지하수 유형분석을 통해 분석한 결과, 강우가 직접적으로 지하수 함양에 영향을 주는 것으로 파악되었다. 또한 일평균 유출량과 강우량의 상관관계 분석에서 0.83~0.97로 높은 상관성을 갖는 것으로 나타났다. This study assessed the hydrogeological characteristics of a seepage area of white leachate. The geological characteristics of the leachate were determined by a surface survey, and an electrical resistivity survey and borehole image processing system (BIPS) were applied to estimate the distribution of discontinuities, to assess the geological structure of the seepage areas. Fluctuations in groundwater level within boreholes were measured during periods of precipitation in the dry and wet seasons. The results show that electrical resistivity is lower in the seepage section than in non-seepage sections. The distribution of fracture zones and limestone cavities was inferred from the logging data and BIPS data. Variations in groundwater level and groundwater recharge, related to rainfall events, show the direct effect of rainfall events during the rainy season. We obtained a strong relationship between seepage amount and rainfall (correlation coefficients of 0.83-0.97).

SQL Server 를 실행하는 컴퓨터 간에 데이터베이스를 이동하는 방법에 관한 연구

용환전 ( Hwanjeon Yong ),조경수 ( Kyung-soo Cho ),김응모 ( Ung-mo Kim ) 한국정보처리학회 2010 한국정보처리학회 학술대회논문집 Vol.17 No.2

시스템을 구축하여 운용하다 보면 하드웨어 또는 DBMS 업그레이드를 위해 데이터베이스를 이동할 필요가 있게 된다. 그 상황은 동일 OS 동일 DBMS 로 이동, 스토리지 환경의 변화에 의한 이동, 상이한 OS 동일한 DBMS 로 이동, 상이한 OS 상이한 DBMS 로 이동 등이 있다. 본 연구에서는 동일 OS 동일 DBMS 로 이동 상황 즉 Windows Server, SQL Server 환경에서 하드웨어업그레이드 및 SQL Server 및 OS 버전 업그레이드를 하는 방법에 국한하여 실제 시뮬레이션을 통해 장단점 및 서비스 중지 시간을 확인해보려 한다.

Ultrapeer를 사용한 P2P 네트워크에서 동일한 관심을 갖는 Peer들의 그룹화 효과

김기(Ki Kim),용환기(Whanki Yong) 한국정보과학회 2005 한국정보과학회 학술발표논문집 Vol.32 No.2

P2P 네트워크는 사용자에게 보다 효율적으로 많은 자원을 공유하고 사용할 수 있는 방법을 제공해야 한다. 이 논문에서는 ultrapeer와 동일한 관심을 갖는 peer들을 서로 그룹화 함으로써 검색에 필요한 query의 수를 줄이는 방법을 제안한다. 이 방법을 검증하기 위해 세가지 P2P 네트워크 - 비구조적이며 브로드케스팅으로 검색하는 네트워크, ultrapeer가 존재하며 지역적 특성을 그룹화 기준으로 하는 네트워크, ultrapeer가 존재하며 동일한 관심을 그룹의 기준으로 하는 네트워크로 모델링 하고 각 모델별로 필요한 데이터의 검색과 전송을 시뮬레이션하여 검색 시간과 발생한 query의 수를 비교하여 제시한다.

사이클론 내 유동특성 및 미세입자 집진효율에 대한 수치해석적 연구

용정권(Jung Kwon Yong),김창녕(Chang Nyung Kim),조영민(Young Min Jo) 대한설비공학회 2008 설비공학 논문집 Vol.20 No.2

A numerical analysis has been carried out to examine the flow characteristics and the collection efficiency for fine particles in a cyclone using Computational Fluid Dynamics (CFD) technique. The cyclone with the cylinder diameter of 60 ㎜ has been considered for the investigation of the particle collection in a relatively smaller cyclone with somewhat higher inlet air velocities. Fundamental air flow patterns for different inlet velocities have been calculated and then the motions of particles of different sizes have been obtained. The calculated collection efficiencies for fine particles are compared with the experimental results, which shows a good agreement. The current result can be used for the design of cyclones with high collection efficiency.

디퓨저/노즐을 이용한 압전형 마이크로 펌프에서 기하학적 형상과 작동 조건에 따른 펌핑특성에 대한 실험적 연구

용정권(J. K. Yong),김창녕(C. N. Kim),김진욱(C. U. Kim) 한국정밀공학회 2008 한국정밀공학회 학술발표대회 논문집 Vol.2008 No.6월

장방형 흡입식 슬러지 수집기에서 수로의 최적설계 및 폐수 유동특성

용정권(Jung Kwon Yong),최청렬(Chung Ryul Choi),김창녕(Chang Nyung Kim) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11

Recently, the sludge suction collector is preferred rather than the scraper type sludge collector due to enhancement of the clarifier efficiency. The sludge suction collector is usually operated by the user's experience without any scientific and technical consideration. There are many factors that should be considered for higher quality of discharged water and stabilized flow in the rectangular sludge suction collector but, the optimal design on the inflow channel and orifices connecting with the inflow channel is needed for similar flow rates at the orifices. The 4 cases of channel geometry are considered and mass flow rates of each case at the orifices are evaluated using Computational Fluid Dynamics applied VOF(Volume of Fraction) model.

광촉매 마이크로 반응기의 내부 형상에 따른 VOC 분해특성에 관한 수치해석적 연구

용정권(Jung Kwon Yong),김창녕(Chang Nyung Kim),염민규(Min-Qou Youm) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5

A numerical analysis was carried out to investigate the degradation of Volatile Organic Compounds (VOC) in photocatalytic microreactors with different inner geometries. Two different cases of microreactor were considered, namely, one microreactor has bump on the channel and the other has no bump on the channel. The removal efficiency of VOC has been calculated by the Langmuir-Hinshelwood reaction rate equation that was obtained from the experimental results. From the numerical calculations, it was observed that the conversion ratio of VOC for the microchannel with bump is about 4.5% greater than the microchannel without bump. And the mass transfer characteristics in the microreactor are also shown in numerical results. These results can be used effectively for the photocatalytic numerical analysis.

압전 구동방식 마이크로 펌프에서 기하학적 형상과 작동조건에 따른 펌핑특성에 대한 실험적 연구

용정권(Jung Kwon Yong),김창녕(Chang Nyung Kim),김진욱(Chin Uck Kim) 대한설비공학회 2009 설비공학 논문집 Vol.21 No.1

In the present experimental study, the pumping performances of diffuser/nozzle based piezoelectric micropumps are estimated with different operating factors and geometries. Here, the effects of the input voltage and frequency on the pumping performances have been examined together with the influences of the positions of the inlet and outlet. The results show that the flow rate of the micropump is larger with larger input voltage with the largest flow rates for the frequency to be close to 6.0 ㎐ all through the current experimental study. Also, it has been found that the positions of the inlet and outlet affect much on the performance of the piezoelectric micropumps. Error estimation has been carried out for the evaluation of the pumping performance in association with the uncertainty of the measurement.

서비스화 수용활동이 서비스화 추진성과에 미치는 영향 :

윤 용(Yong Yoon),김연성(Youn Sung Kim) 한국IT서비스학회 2016 한국IT서비스학회지 Vol.15 No.4

The purpose if this study was to find and investigate effective mediation factors influencing performance of servitization through servitization acceptance activities by means of empirical results. According to the previous researches, two main mediation factors which were related with servitization competencies such as ICT competency of servitization and competency of servitization process were distinguished from lots of competencies which are relying on servitization process. Using a 373 sample data investigated from CEOs, directors and managers of small and medium sized firms in Korea, the structured mediation model was proposed. The measurement for the each variable was accepted for this study when the respondents were revealed to understand the servitization concepts which explained especially company’s business moving towards the service specific gravity from selling existing products. The measurement for the each variable reflected that respondents were participating in any sort of servitization type or had intension to be involved with any servitization categories. The mediation hypotheses were tested in the way of analytical measures with the result of strong reliability. According to analysis, two mediators showed positive mediation role and statistically adopted between servitization acceptance activities and servitization performance in the 99% significant level. We confirmed that ICT competency of servitization and competency of servitization process were in the role of positive mediation between servitization acceptance activities and performance of servitization. The total of indirect effects were 0.2546 to support each mediation hypotheses. Tested two mediators were not on the same level. The most affecting mediation element on servitization performance was appeared as competency of servitization process. With the result of this study, we expect that the small and medium sized companies might have servitization business strategies including proper service competencies and mediators through acceptance activities to obtain suitable performance. According to the analysis, Companies which consider product-servitization need to set strategies to reinforce above two competencies.

Analysis of Consulting Research Trends Using Topic Modeling

Min Kwan Kim(김민관),Yong Lee(이 용),Chang Hee Han(한창희) 한국산업경영시스템학회 2017 한국산업경영시스템학회지 Vol.40 No.4

‘Consulting’, which is the main research topic of the knowledge service industry, is a field of study that is essential for the growth and development of companies and proliferation to specialized fields. However, it is difficult to grasp the current status of international research related to consulting, mainly on which topics are being studied, and what are the latest research topics. The purpose of this study is to analyze the research trends of academic research related to ‘consulting’ by applying quantitative analysis such as topic modeling and statistic analysis. In this study, we collected statistical data related to consulting in the Scopus DB of Elsevier, which is a representative academic database, and conducted a quantitative analysis on 15,888 documents. We scientifically analyzed the research trends related to consulting based on the bibliographic data of academic research published all over the world. Specifically, the trends of the number of articles published in the major countries including Korea, the author key word trend, and the research topic trend were compared by country and year. This study is significant in that it presents the result of quantitative analysis based on bibliographic data in the academic DB in order to scientifically analyze the trend of academic research related to consulting. Especially, it is meaningful that the traditional frequency-based quantitative bibliographic analysis method and the text mining (topic modeling) technique are used together and analyzed. The results of this study can be used as a tool to guide the direction of research in consulting field. It is expected that it will help to predict the promising field, changes and trends of consulting industry related research through the trend analysis.