전자상거래의 비용우위 효과에 관한 소비자 지각 : 인터넷 쇼핑몰 이용자를 중심으로 Concentrated on Consumers' Perceptions on the Internet Shopping Mall

유동근,서영호,조임현 한국경영과학회 1999 한국경영과학회지 Vol.24 No.4

Since the Internet was applied for commercial purpose, many companies have been making use of the internet in electronic commerce and the internet has brought many changes on consumer and supplier behaviors. It seems that consumers and suppliers can obtain more accurate information rapidly and pay less for the same product/service than in traditional commerce. This study tries to investigate the difference in the cost factors perceived by consumers between traditional commerce and the Internet commerce. Empirical results show that there is no significant difference in consumers' perception of cost factors between traditional commerce and the internet commerce Contrary to general perception, a large number of consumers do no, believe that the internet commerce is generally more economical than traditional commerce. The factors where the consumers think Internet commerce has cost advantages are search cost and purchasing cost. However, consumers are understanding the benefits of the internet commerce and are expecting that internet commerce bring about economic advantages in consumer markets in the near future.

펄스 옥시미터 시스템 구현에 관한 연구

유동주,허 웅,김근이,이호재,임현수 明知大學校 産業技術硏究所 1992 産業技術硏究所論文集 Vol.11 No.-

In this paper, we implemented a pulse oximeter system which is measured oxygen saturation coefficient of a human blood in vivc We use the Beer-Lambert Law to measure the percentage of hemoglobin is oxygen saturation. The oximeter sensor are consisted of two LED(RED and INFRARED LED) and a single photodiode. The photodiode measures lights which transmitted through the tissue from two light source alternately, We calculated a ratio of light transmittance between two LEDs and then, it applied for the oxygen saturation coefficient calculation to formula. As a result, the oxygen saturation coefficient that measured from normal conditions men was 96.43[%]

마이크로그로브 형태에 따른 평활근 세포 운동 측정

유소영,박찬영,정석,김동익,이병붕,허세호,한동철,장준근 대한혈관외과학회 2002 Vascular Specialist International Vol.18 No.2

Purpose: The spreading, orientation, and chemotaxis the gradient of a chemoattractant of smooth muscle cells (SMCs) were studied on the micro-grooved substrata by the light, fluorescence and scanning electron microscopy. Method: Vertical-walled grooves were produced in silicon wafers by the micromachining technique. All grooves were 4~20㎛ deep and 10~80㎛ wide, SMCs were cultured on each microgroove and examined under stereo-microscope. Result: Cell clusters were markedly oriented by all the grooved substrata examined. Tim-lapse images acquired from CCD (Charge Coupled Device) showed that the grooves directed the migration of SMCs. There was no prominent difference in the migration speed of SMCs according to the grooves. All the cytoskeletal fibers were reoragnized in the same direction with grooves. Especially the alignments of microtubule and intermediate filaments were distinguished in the SMCs on the micro grooves. Conclusion: These results could be applied to the analysis of vascular restenosis and the development of artificial blood vessels.

마산연안지역의 국지풍 순환 및 대기오염물질 확산에 관한 연구

김유근,이화운,문윤섭,김해동,원경미,정우식,오인보 부산대학교 환경문제연구소 1997 環境硏究報 Vol.15 No.1

To investigate a horizontal windrose and the mixing height in Masan coastal area, a local atmospheric flow and the concentration of air pollutants were analyzed by abserved data from AWS, airsonde and air sampler. The land-sea breeze model and the ISCST2 model of U. S. EPA(Environmental Protection Agency) were used to predict the concentration of air pollutants such as SO2 and TSP. As a result, during spring the principal wind direction in the Masan region is mainly represented by windrose of the WNW and NW, which can be induced by land breeze and the SE and SSW of sea breeze even if weak wind speed. The mixing height during the measurement was marked with the range from 400 m(0900 LST) to 1450 m(1500 LST), and the height of an inverse layer was presented as the range from 30 m(2100 LST) to 150 m(0300 LST). It is very important to cosider the local wind field for the accurate diffusion and movement of air pollutants in coastal urban area. The atmospheric flow was simulated by the two-dimensional local wind model upon considering the orographic characteristics such as land-sea contrast, mountain valley and urban building. The result of air quality simulated by ISCST2 support that the dispersion pattern of the pollutants in that area was followed as local circulation system in coastal urban area.

In situ FTIR과 질량분석기를 이용한 반응 메카니즘 연구

이동근,김둘선,유창무 慶尙大學校生産技術硏究所 1994 生産技術硏究所論文集 Vol.10 No.-

구리촉매에서 메탄올 분해 메카니즘은 in situ FTIR과 MS로서 조사하였다. in situ FTIR과 MS는 메카니즘 연구에 뛰어난 장치이므로 메탄올분해 메카니즘을 in situ FTIR과 MS결과에 근거해서 제의했다.

우리나라 行政區劃線의 不合理要因과 그 改善方向에 관한 硏究

金裕赫,琴東信,梁在乾,李鳳三 단국대학교 법정대학 지역개발학과 1980 地域開發論叢 Vol.2 No.-

1. This thesis aims at analyzing the characteristics of the demarcation line of the administration areas in Korea by reviewing the history and background of how it was drawn and at the same time at exploring ways of correcting factors contributing to problems and ineffectiveness of administration. In order to collect data of opinions on this matter from officials actually assigned to the counties and their sub-level administration areas where administration is bifurcated in two separated blocks of areas, irrespective of the administrative efficiency and convenience of the populace in the areas, we selected eight kuns of this nature and sent questionaires to 488 chiefs and leading officials of kuns, myuns and villages. A total of 237 persons, 48.6% out of 488 responded. This data proved to be very expedient and instrumental in carrying out this study. 2. One of the characteristics of the demarcation line of administration areas is that it is drawn on the basis of natural conditions such as the extention of mountains, meandering lines of rivers, the formation of the community, traditional reasons, and so forth rather than on the theoretical as well practical backgrounds imbued with administrative philosophy, which seeks for rational and balanced development of a whole community with two factors in mind: the principle of spatial division as an administrative skill and the principle of spatial harmony for balanced division of administration zones. However, it is true that a large number of local inhabitants have felt inconveniences due to the boundary lines being zigzag or meandering. When we surveyed on the frequency of going to market as an indicator of economic activities of the people living along the boundary lines, it is found that almost 77.6% of the people questioned answered that they were going to markets located in the neighboring kun rather than those in their own administration zones. The factors that lead to choosing markets are usually two: one is spatial distance and the other is the peoples norm of life. Although the nature of the responses may vary according to where people live within the divided block of the administration area, a total of 86.6% of the questioned expressed their hope that the boundary lines would be straightened. This reflects their wishes of improving the efficiency of local administration and convenience of living for effectiveness of the administration cantrol. For example, state boundary lines of the U.S and Australia belong to the theoretical type is whereas sung boundary lines of China and kun(county) demarcation lines of Korea belong to the natural condition (or setting) type. Especially, some of administration demarcation lines of Korea have been zigzay so that one kun is divided into two or more separate blocks of areas as the result of city administration areas within the kun becoming enlarged. There are eight cases of this nature in Korea. 3. Our survey which was conducted to discover in part the extent of awareness of such bifurcation or division by the inhabitants living in the divided zones, showed that only 83.4% of those who responded said that they had knows the fact and the remaining 15.5% were quite unaware of the fact until they came to realize it upon reading our questionaire. This extent of unawareness means that local ranking administration leaders did not pay much attention to the effect of the local administration with respect to the boundary lines. 4. Speaking from the above finding, we are to propose that irrational factors related to the present administration demareation lines be corrected and improved for the following reasons: 1) To enhence the efficiency of administration, 2) To reestablish the system of utilization of resources 3) And finally to enlarge the integrated potentials of various social dynamics. We hope that efforts will be made to straighten administration demarcation lines as far as possible, taking into consideration the opinions and wishes of the people living in the affected areas and zones so that directions of development and improvement on this matter may be effectively explored. At the same time we propose the establishment of long range policies with a view of eliminating disparity in the development between the regions, by implementing necessary measures for development of local cities.

비만 지표와 흡연,음주,지질,혈당 및 혈압과의 관계

이재근,유병연,조동영 건국대학교 의과학연구소 2000 건국의과학학술지 Vol.10 No.-

It is well known that obesity is an important cause of risk factor of cardiovascular disease, emphasized by many studies and cardiovascular disease has been found to correlate not only to the extent of obesity, but also the fat distribution of the individual. Recently, focusing on obesity of the abdomen, we were able to evaluate the significance of obesity indices by examining correlations between these indices and the risk factors of cardiovascular disease. Three hundred sixty four health examined persons through out-patient department of family medicine, Seoul hospital of Konkuk medical center were chosen as subjects of this study but finally one hundred twenty five examined persons were selected. The auther analysed correlations between obesity indices and cardiovascular risk factors by measuring serum lipid levels, fasting blood glucose levels and blood pressure that are thought to be risk factors of cardiovascular diseases and obesity indices were calculated using anthropometric measurements. The abdominal obesity indices and risk factors of cardiovascular disease, the levels of total cholesterol in the serum, fasting blood glucose levels, systolic and diastolic blood pressure, increased significantly according to age and there was a significant difference in the abdominal obesity indices according to drinking and smoking habits. Systolic and diastolic pressures had significant differences according to the presence or absence of an alcohol drinking history. There were negative correlatons between HDL-cholesterol and obesity indices(r = -0.248, -0.215, -0.204, -0.256, -0.201) and the weakest correlaton was found or noted between fasting blood glucose level and sagittal diameter. Among obesity indices, sagittal diameter and sagittal diameter per height may be important prognostic indicators or risk factors of cardiovascular disease.

집단수준에서 변혁적 리더십 및 집단 효능성과 집단성과의 관계에 관한 연구

조임현,유동근 한국경영과학회 2000 韓國經營科學會誌 Vol.25 No.1

The purpose of this paper is to investigate the relationships among transformational leadership, group-efficacy, and group performance. A total of 321 employees of a fire and marine insurance firm in Seoul anonymously completed the Multifactor Leadership Questionnare-Form V. which consists of tree factors(charisma, individualized consideration and intellectual stimulation) for transformational leadership, and two factors(contingent reward and management by exception) for transactional leadership. The sample, which largely consists of sales supervisors and salesmen, includes 41 sales office branches. The findings of the study are as follows Transformational leadership is closely associated with group-efficacy and group performance. That is, there are significant correlations between transformational factors and group-efficacy, between the factors and group performance, and between group-efficacy and group performance. A stepwise multiple regression analysis revealed that transformational leadership augmented the subordinates's extra efforts. It was also found that group-efficacy was mediating the relationship between transformational leadership and group performance. The managerial implications of these findings and future directions jof research are also discussed.

COX 모델을 이용한 생존자료분석에서 Proportionality 가정 검정의 의의

이무송,유근영,노동영,최국진 대한암학회 1991 Cancer Research and Treatment Vol.23 No.4

폴리머 침투콘크리트 휨부재의 거동

이상민,유동우,이용진,변근주 연세대학교 산업기술연구소 1992 논문집 Vol.24 No.1

Polymer-Impregnated Concrete(PIC) is a new polymer-concrete composite material which consists of basic cement concrete and polymer. The mechanical properties and behavior of PIC depend on the type of polymers and the impregnation techniques. In general, the polymer impregnation can improve the strength, durability and ductility of normal concrete. The objective of this study is to develop the analytical procedure for analyzing the structural responses of polymer-impregnated concrete flexural members with different polymer loading by using finite element method on the basis of experimental results.