낙동강변 실트질 모래의 수리전도도와 전기적 물성과의 관계

김수동,박삼규,함세영,오윤영,Kim, Soo-Dong,Park, Samgyu,Hamm, Se-Yeong,Oh, Yun-Yeong 한국지하수토양환경학회 2014 지하수토양환경 Vol.19 No.3

Hydraulic conductivity is an important parameter, representing permeable property of the groundwater in aquifers, in the issues of groundwater development, groundwater contamination, and groundwater flow, etc. We estimated a relationship between hydraulic conductivity and electrical properties (formation factor, chargeability, and time constant) of silty sand in the laboratory. For this study, we conducted grain size analysis, constant head permeameter test, and measured electrical resistivity and spectral induced polarization of silty sand samples collected from the riverside alluvium of the Nakdong River in Nogok-ri area, Dasan-myeon, Goryeong-gun in Gyeongbook Province, Korea. In the laboratory test, we used soil samples of approximately uniform porosity with 0.5% error range, and kept the electrical resistivity of pore water with 100 ohm-m. As a result, the relationship between effective particle size and hydraulic conductivity agrees fairly well with the existing empirical formulas. Hydraulic conductivity was correlated with formation factor, chargeability, and time constant: hydraulic conductivity increased with increasing formation factor and time constant as well as with decreasing chargeability.

표준사와 유리구슬을 이용한 수리전도도와 전기비저항의 관계

김수동,박삼규,함세영,Kim, Soodong,Park, Samgyu,Hamm, Se-Yeong 대한자원환경지질학회 2013 자원환경지질 Vol.46 No.3

We estimated the hydraulic conductivity of the sediments using constant-head permeability tests and electrical resistivity measurements with Jumoonjin standard sand of a uniform size and glass beads of different grain sizes. In this study, we determined the variations of the porosity, the hydraulic conductivity, and the resistivity in case 1 (changing the packing of the Jumoonjin standard sand) and in case 2 (varying the size of the glass beads). The results of case 1 showed that the hydraulic conductivity decreased with an increase in the electrical resistivity. This occurred because the sand grain while packing became rhombohedral with the a decrease of both the pore size and porosity. The results of the case 2 showed that the hydraulic conductivity increased due to the increase in the pore size as caused by the increased glass bead size. In addition, the porosity decreased and the electrical resistivity increased. Therefore, the relationship between the hydraulic conductivity and the electrical resistivity is negatively proportional as regards the grain packing with a change from cubic to rhombohedral whereas this relationship is positively proportional to the increase in the grain size. 자유면대수층의 수리전도도와 전기비저항 사이의 상관관계를 도출하기 위하여 입자크기가 비교적 균일한 주문진표 준사와 여러 가지 입자크기의 유리구슬을 대상으로 정수위 투수 시험과 전기비저항 측정을 실시하였다. 첫 번째 실험에서는 주문진표준사의 입자배열의 변화에 따라서 그리고 두 번째 실험에서는 유리구슬의 입도 변화에 따라서 공극률, 수리전도도, 전기비저항간의 변화를 파악하였다. 그 결과, 첫 번째 실험에서는 주문진표준사의 다짐정도가 커질수록 공극의 크기와 공극률은 감소하기 때문에, 수리전도도는 작아지고 전기비저항은 커지는 경향을 보였다. 두 번째 실험에서는 유리구슬의 입자크기가 커질수록 공극의 크기는 커지지만 공극률은 작아졌으며, 수리전도도와 전기비저항은 모두 증가하는 경향을 보였다. 따라서 입자배열이 입방체 배열에서 능면체 배열로 변화할 때 수리전도도와 전기비저항은 반비례관계를 나타내는 반면, 입자 크기가 커지면 수리전도도와 전기비저항은 비례관계를 나타내는 것으로 밝혀졌다.

FTA로 무엇을 얻을 것인가? - 아시아태평양지역의 FTA 현황과 우리의 대응방안

김수동,Kim, Su-Dong 대한석유협회 2015 석유와 에너지 Vol.297 No.-

온라인 게임 커뮤니티가 합리적 문제해결 능력이 팀워크에 미치는 영향

김수동,정형원,Kim, Soo Dong,Jeong, Hyung Won 조선대학교 기초과학연구원 2021 조선자연과학논문집 Vol.14 No.3

Previous research on online games has suggested that virtual world activities improve problem solving and interpersonal skills, but FPS and MMORPG are not well distinguished in various monomeric and difficult activities. The reason for this is that qualitative considerations of activities in the virtual world have not yet been made. Therefore, Tom Clancy's Rainbow Six-Siege, one of the most popular FPS in Japan, focused on the difficulty of supporting groups, and participated in observation and interviews to investigate the quality observation and interviews. The results showed that the first high-difficulty quest requires problem-solving skills and interpersonal skills in an environment where most of the nonverbal information is blocked. Second, it is important to extract players' thoughts and actions from high-difficulty quests, and to identify problems, confirm evidence and facts, propose causes and solutions, and to work together with coordinated actions and harmonious actions. Furthermore, it has been found that these capabilities are provided as two important leadership functions in actual collective work.

객체기술의 현황과 미래

김수동,Kim, Su-Dong 한국데이터베이스진흥원 1999 디지털콘텐츠 Vol.2 No.-

인슐린 - 비의존성 당뇨병환자에서 최대운동부하검사에 의한 심폐적성 및 에너지대사능의 평가

김신우(Shin Woo Kim),강문수(Moon Soo Kang),김수동(Su Dong Kim),김정국(Jung Guk Kim),하승우(Sung Woo Ha),김보완(Bo Wan Kim),석준(Jun Suk),박희명(Hi Myung Park),김유문(Yu Moon Kim),김종석(Jong Suk Kim) 대한내과학회 1995 대한내과학회지 Vol.49 No.1

Objectives : The cardiorespiratory fitness including maximal oxygen uptake(VO, max) in diabetics is generally known to be low, but it is also reported to vary depending upon the type of diabetes mellitus and presence or absence of complicating coronary heart disease and/or cardiovascular autonomic dysfunctions. The purpose of our study is to assess cardiorespiratory fitness and energy metabolism at maximal exercise in non-insulin dependent diabetics without these complications. Methods : Symptom-limited maximal exercise tests by Bruce protocol were carried out in 28 non-insulin dependent diabetic men with neither clinical cardiopulmonary diseases nor cardiovascular autonomic dysfunctions and in 103 matched controls. Comparisons of HR max, VO2 max and their derivatives, and respiratory exchange ratio(RER) and energy expenditure(EE) were made between the diabetics and the controls. In addition, the correlations of RER and EE with the various body characteristics including age were computed. Results: The mean of various parameters reflecting cardiorespiratory responses to maximal exercise and indices of energy metabolism such as RER and EE showed no significant differences between the diabetics and the controls. However, the EE at maximal exercise in the diabetics was significantly inversely correlated with the age alone(r=-0.61, p<0.001), whereas in the controls, it showed a slight negative correlation with age(r= -0.37, p<0.01). Conclusion: These findings suggest that cardiorespiratory fitness level and energy metabolism at maximal exercise in non-insulin dependent diabetic men unaccompanying cardiovascular diseases and autonomic dysfunctions are essentially similar to the normal controls. Nonetheless, the fact that the EE at maximal exercise is highly correlated with the age in the diabetics may be of value to be considered in exercise prescription for these patients.

소상인의 가업승계의도에 대한 결정요인 분석

김수동 ( Kim Su-dong ),김승희 ( Kim Seung-hee ),김영기 ( Kim Young-ki ) 한국유통경영학회 2018 유통경영학회지 Vol.21 No.4

The purpose of this study was to investigate the factors affecting the succession of small-sized enterprises based on the data of 2015 Market, Shopping Street and Store Management Survey conducted by the Small Enterprise And Market Service(SEMAS). This study was intended to find out whether sales, maintenance period, inherited business, three costs (labor cost, raw material cost, rent fee) have an effect on succession intention of small-sized enterprises by using logistic regression. The result showed that sales, maintenance period, and inherited business positively influence the possibility of succession intention while rent fee negatively affect outcome variables. Further analysis was conducted about whether sales, maintenance period, and the three cost factors have influenced on the consensus about re-succession intention by using logistic regression. The result showed that sales and duration period positively influence increasing the re-succession intention, but only the rent fee negatively influence decreasing the possibility. Based on the results of this study, implications and future research were discussed.

대규모강의에서의 학습자참여 활성화방안에 관한 연구

김상무 ( Kim Sang-mu ),김수동 ( Kim Soo-dong ),김세곤 ( Kim Se-gon ),김영규 ( Kim Young-kyu ),주재훈 ( Ju Jae-hoon ) 동국대학교 교육연구소 2018 교육연구 Vol.3 No.1

대규모 인원이 수강하는 대학 강의에서 학생들의 참여를 유도하는 것은 교수자에게는 필요하면서도 중요한 과제이다. 수강생의 능동적인 학습참여 없이는 학습의 성과를 보장할 수 없기 때문이다. 이러한 문제의식에서 본 연구는 대규모 강의에서 학습자들의 수업참여를 활성화시킬 수 있는 교수방법을 연구하고자 했다. 연구자들이 생각하는 학생들의 참여를 활성화시킬 수 있는 교수방법을 1-2가지씩 조사하여, 실제 수업에서 활용하는 방법, 그리고 가능성과 한계를 함께 논의하기로 했다. 제안된 교수법은 문답법, 협동학습, 토론/토의법, 휴대폰 활용수업, 심포지움, 토크쇼, ICT활용 토론학습법이었다. 논의된 교수법들은 나름의 장단점을 가지고 있다. 강의의 목표와 특징에 따라 적절한 교수법을 활용하는 것이 중요하다. 몇 가지를 함께 수업에서 활용해보는 것도 학생들의 참여를 제고하는데 도움이 될 수 있을 것이다. It is necessary and important for professors to activate students' participation in a massive class at a university, because it can't insure the success of a university class without participation of students. In this critical mind, this study is to survey of teaching methods which activate students' participation. Every researcher of this study suggest one or two teaching methods to activate students' participation and discuss concrete application in a massive class and strength and weakness of each suggested method. They are question and answer, cooperative learning, discussion, class using cell phone, symposium, talk show, discussion using ICT. The suggested teaching methods have respectively their own strength and weakness. Therefore it is important to select appropriate methods according to the goal and characteristics of the class. It can be helpful to use some methods together to activate students' participation in a massive class.

교사의 학생평가 전문성 기준 개발

김경희(Kyunghee Kim),김신영(Shinyoung Kim),김성숙(Sungsook KIM),지은림(Eunlim Chi),반재천(Jae-Chun Ban),김수동(SooDong Kim) 한국교육평가학회 2006 교육평가연구 Vol.19 No.2

  학교교육의 내실화와 교실에서의 효율적인 문제해결을 위하여 평가에 대한 욕구가 점차 증가함에 따라, 평가와 관련된 교사의 업무는 훨씬 복잡해지고 있으며 더불어 신뢰롭고 타당한 학생평가를 위한 교사의 전문성에 대한 요청도 증가하고 있다. 본 연구에서는 이러한 요청에 따라 교사의 학생평가 전문성을 계발하고 신장시키기 위하여 “교사의 학생평가 전문성 기준” 을 개발하였다. 학생평가 전문성 기준은 교사의 학생평가 전문성의 5가지 능력요소 즉, “평가방법의 선정”, “평가도구의 개발”, “평가실시ㆍ채점ㆍ성적 부여”, “평가결과의 분석ㆍ해석ㆍ활용ㆍ의사소통”, “평가의 윤리성”에 따라 11개의 기준과 각 기준을 설명하는 구체화된 세부적인 55개의 평가지식과 기술을 개발하였다.   Standards of teacher"s competence in student assessment was developed in this study In this study, the plan for practical use of these standards took a concrete form.<BR>  First, the characteristics and the definition of teacher"s competence in student assessment were explained in this study. Teacher"s competence in student assessment can be defined as "the competence or capability of collecting, interpreting as well as applying the students" assessment information about students" learning and achievement". This competence is the assessment literacy that should be required before actually assessing the students.<BR>  Second, standards of teacher"s competence in student assessment was developed by examining and revising year 2004 TPCSE in depth. The development process are 1) analysis of the concepts in teacher"s competence in student assessment" 2) extraction of the competence components 3) description of each standard of teacher"s competence per each competence component 4) Continuous consultation with the experts 5) Completion of standards of teachers" competence that are required to do the student assessment.

Yield and Commercial Characteristics according to Furrow Height in Cultivation of Cynanchum wilfordii

Su Dong Kim(김수동),A Reum Kwon(권아름),Bong Jae Seong(성봉재),Sun Ick Kim(김선익),Ka Soon Lee(이가순),Hyun Ho Kim(김현호) 한국약용작물학회 2018 한국약용작물학회 학술대회논문집 Vol.2018 No.1