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      • KCI등재
      • KCI등재

        경제경영이해력에 대한 국제 비교 연구 - 한국과 중국의 경제경영이해력시험 결과를 중심으로 -

        김재진,최병일,오재현 한국경제교육학회 2015 경제교육연구 Vol.22 No.1

        This study investigates the results on the test of economy and business understanding between Korea and China. For comparison of the result, we conducted MK-TEST for two university students in China (Fudan University, Nanjing University of finance & economics). We find that the average correct answer rate of Korea is more higher than one of China according to the overall results. The average difference rate is abut 15% between Korea and China. More concretely, the correct answer rate of business area is more higher than one of economy area, identifying them by subject area. Examining closely by the type of questions, the difference of average correct answer rate of conceptual questions is about 20% between Korea and China (Korea - China), but one of the applied questions is just about 5%. According to the results, we can infer that there are no or little differences in the ability of examinee to solve applied questions between Korea and China and the differences of the scope and emphasis point in an academic curriculum between both countries might bring these kind of results. Finally Chinese students shows higher correct answer rate to the questions about the economy issues and policies related to China than one of Korea examinee. 본 연구는 한국과 중국의 대학생 이상 응시자를 대상으로 양국의 경제ㆍ경영 이해력을 비교 분석한 것이다. 이를 위해 기 시행된 한국의 시험 결과와 중국 현지 2개 대학(푸단대, 남경재경대)의 재학생을 대상으로 한 시험 결과를 비교 분석했다. 분석 결과 전체적인 정답률은 한국이 높았고, 세부적으로 경제보다는 경영 분야에서 한ㆍ중 정답률 차이가 더 컸다. 경제 분야 한국-중국 정답률 차이는 약 12%p 였다. 이를 다시 문항의 유형별로 살펴보면 기본 지식을 묻는 개념형 문제에서는 약 20%p 정답률 차이를 보였지만, 원리의 적용 등을 묻는 응용형 문항에서는 5%p 미만의 정답률 차이 밖에 발생하지 않았다. 이는 양국 응시자들의 응용력에는 큰 차이가 없지만, 각 국이 학습하는 범위가 다르거나 학습적으로 강조하는 개념이 서로 다를 수 있다는 점을 유추할 수 있다. 이를 반영하듯이 중국 응시자들은 특히 자국의 경제 정책이나 제도와 관련한 내용에는 상대적으로 높은 정답률을 보였다.

      • SCOPUSKCI등재

        1,1,1 - 삼염화에탄의 합성공정개발

        김재진,이화영,이기준,강희동 한국화학공학회 1976 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.14 No.3

        염화비닐 합성공정의 부산물로 생산되고 있는 1,1,2-삼염화에탄을 接觸分解하여 염화비닐리덴을 만들고 이 과정에서 생산되는 염화수소 가스를 이용하여 염화비닐리덴으로부터 1,1,1-삼염화에탄을 합성하는 공정에 대하여 연구하였다. 1,1,2-삼염화에탄의 분해에 사용된 촉매는 활성탄에 擔持시킨 鹽化바륨 및 鹽化銅으로서 20∼30% 염화바륨 담지촉매가 염화비닐리덴의 선택도에 가장 좋은 결과를 보여주었다. 반응온도 400∼500℃ 범위에서 염화비닐리덴의 선택도는 최고 35%까지 얻을수 있었다. 1,1,1-삼염화에탄의 합성에는 Friedel-Craft 촉매를 사용하였으며 1,1,1-삼염화에탄의 합성 반응은 염화수소 가스를 계속해서 과잉으로 공급할때 염화비닐리덴의 농도에 대하여 一次 반응이며 0.6%의 촉매농도 범위에서 촉매농도에 비례하는 것을 확인하였다. A process is developed for the synthesis of 1,1,1-trichoroethane from 1,1,2-trichloroethane, a byproduct produced in the vinyl chloride process. Catalytic dehydrochlorination of the 1,1,2-trichloroethane produces vinylidene chloride, 1,2-dichloroethylene and hydrogen chloride of these vinylidene chloride and hydrogen chlo ride react subsequently to form the 1,1,1-trichloroethane in a Friedel-Craft catalytic process. Barium chloride or copper chloride of 5 to 30 percent by weight supported on the activated carbon is used as catalyst. The selectivity for vinylidene chloride is attained up to 35 percent in the reaction temprature range of 400℃ to 500℃ using 20 to 30 percent barium chloride catalyst. It is also confirmed that the synthesis of 1.1.1-trichloroethane is a first order reaction with respect to the concentration of vinylidene chloride when excess hydrogen chloride gas is bubbled continuousley into the catalytic slurry reactor, and its rate is linearly proportional to the concentration of anhydrous aluminum chloride catalyst.

      • KCI등재
      • KCI등재
      • KCI등재후보

        On-Line Estimation of Departure Time-Based Link Travel Times from Spatial Detection System

        김재진,노정현,박동주 서울시립대학교 도시과학연구원 2009 도시과학국제저널 Vol.13 No.1

        The link travel time (LTT) estimation logic, using the spatial detection system, can be classified into two classes based on the aggregation point of view: departure time-based (DTB) and arrival timebased (ATB) aggregations. The former is conceptually advantageous over the latter because it provides the LTTs, which are experienced by vehicles departing at the same time period. However, the existing studies on link travel time (LTT) estimation have focused on ATB- LTT estimation,rather than on DTB-LTT estimation. Although some research in this area has developed DTB-LTT estimation algorithms, they are not applicable in a real-time mode. The objective of this study is to develop a DTB-LTT estimation algorithm, which is applicable in a real-time mode. This study compares the mean DTB- and ATB-LTT estimates from the two estimation perspectives: on-line and off-line. Then the tradeoff between the accuracy and timeliness of the on-line DTB-LTT estimates and their implications on the LTT estimation procedure are discussed. Lastly, this study develops an on-line DTB-LTT estimation algorithm which utilizes the Bayesian inference logic and demonstrates it using spatial travel time data from the Toll Collection System (TCS) of the Korea Highway Corporation. It was found that the proposed approach could estimate DTB-LTTs in a real-time context with an acceptable level of accuracy and timeliness. The link travel time (LTT) estimation logic, using the spatial detection system, can be classified into two classes based on the aggregation point of view: departure time-based (DTB) and arrival timebased (ATB) aggregations. The former is conceptually advantageous over the latter because it provides the LTTs, which are experienced by vehicles departing at the same time period. However, the existing studies on link travel time (LTT) estimation have focused on ATB- LTT estimation,rather than on DTB-LTT estimation. Although some research in this area has developed DTB-LTT estimation algorithms, they are not applicable in a real-time mode. The objective of this study is to develop a DTB-LTT estimation algorithm, which is applicable in a real-time mode. This study compares the mean DTB- and ATB-LTT estimates from the two estimation perspectives: on-line and off-line. Then the tradeoff between the accuracy and timeliness of the on-line DTB-LTT estimates and their implications on the LTT estimation procedure are discussed. Lastly, this study develops an on-line DTB-LTT estimation algorithm which utilizes the Bayesian inference logic and demonstrates it using spatial travel time data from the Toll Collection System (TCS) of the Korea Highway Corporation. It was found that the proposed approach could estimate DTB-LTTs in a real-time context with an acceptable level of accuracy and timeliness.

      • KCI등재

        Modeling flow and scalar dispersion around Cheomseongdae

        김재진,송효종,Jong-Jin Baik 한국풍공학회 2006 Wind and Structures, An International Journal (WAS Vol.9 No.4

        Flow and scalar dispersion around Cheomseongdae are numerically investigated using a three-dimensional computational fluid dynamics (CFD) model with the renormalization group (RNG) k - e turbulence closure scheme. Cheomseongdae is an ancient astronomical observatory in Gyeongju, Korea, and is chosen as a model obstacle because of its unique shape, that is, a cylinder-shaped architectural structure with its radius varying with height. An interesting feature found is a mid-height saddle point behind Cheomseongdae. Different obstacle shapes and corresponding flow convergences help to explain the presence of the saddle point. The predicted size of recirculation zone formed behind Cheomseongdae increases with increasing ambient wind speed and decreases with increasing ambient turbulence intensity. The relative roles of inertial and eddy forces in producing cavity flow zones around an obstacle are conceptually presented. An increase in inertial force promotes flow separation. Consequently, cavity flow zones around the obstacle expand and flow reattachment occurs farther downwind. An increase in eddy force weakens flow separation by mixing momentum there. This results in the contraction of cavity flow zones and flow reattachment occurs less far downwind. An increase in ambient wind speed lowers predicted scalar concentration. An increase in ambient turbulence intensity lowers predicted maximum scalar concentration and acts to distribute scalars evenly.

      • 穀價平準化 政策에 對한 一考察

        金載珍 慶北大學校 1963 論文集 Vol.7 No.1

        This essay deals simply with the ironing out policy by government of the price of grain, through equilibrating demand and supply, without regard to the general price level or a peasant's income. The Price of grain seems to depend on the supply side of it, while demand being stable if there is no great political or economic accident. So, a mechanism to iron out the price of grain must be how to iron out the amount of grains to be sold at markets. For this purpose, government put info effect the Rice Mortgage Finance Act in 1957. Whit it, government seems to have succeeded in iroing out the price until the spring of 1960. The Rice Mortgage Finance is, as self-evident, to lend money to peasants when they need money of mortgage of rice they bring in. Generally speaking, poor peasants used to sell their rice right after the harvest in autumn to return their debts with high interest. This is why markers are full of rice, so that the price of rice is so low in November and December. What government intended is to lend money to those peasants who most need money, so that they put race as mortgage to government, not selling them at markets with a low price as such. Of course, the mortgage rice is to sell at high price when rice is scarce at markets. Adding to the mortgage rice which amounts to more or less of one million suks(石), there are four other kind of grain which do the same role as mortgage rice. Namely, price controling rice, relief grain, lend-lease grain, and change grain on credit. In 1957, the total of grain to iron out the market price was 1,011,927 suks. In 1958, it was 1,518,384 suks. In 1959, it was 2,093,586 surfs. In 1960. it was 2,185,358 suks. Between 1957 and 1959, the greater the amount of the grain for this purpose. the less the up and down of the price of grain during a year. It seems to me that the optimum amount of grain to control the price is more or less of three million suks. This amounts to about ten percent of total grain product of this country. When there is any sudden change in demand, the effect of price controling rice may be very weak. For example, the Student Rovolution and the rumor of rice export in 1960 뒷부분이 없음??

      • KCI등재후보

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