• Proceedings of the KIEE Conference
• /
• 2008.10a
• /
• pp.107-108
• /
• 2008

This article describes optimization for PGS(Patterned Ground Shield) of rectangular spiral inductor using Taguchi's Design of Experiment. PGS is decrease method of parasite component by silicon substrate among dielectric loss reduction method. Using taguchi's design of experiment, each parameter is fixed upon that PGS high poison(A), slot spacing(B), strip width(C) and overlap turn number(D) of PGS design parameter. Then we verified that percentage contribution and design sensitivity analysis of each parameter and level by signal to noise ratio of larger-the-better type. We consider percentage contribution and design sensitivity of each parameter and level, and then verify that model of optimization for PGS is lower inductance decreasing ratio and higher Q-factor increasing ratio by EM simulation.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
• /
• v.29 no.7
• /
• pp.47-53
• /
• 2015

As the industrial development in Korea, the power demand is rapidly increased. The power system has been extended and complicated to meet the power demand. However, the fault current increases because the structure of power system reduces the equivalent impedance. One of the solutions to reduce the fault current is Superconducting Fault Current Limiter(SFCL) and the researches of SFCL application have much conducted. In this paper, we used the Circuit Breker Burden Index(CBBI) to select application location of SFCL because the CBBI may consider a fault current of each line. In addition, this paper divided the weight factor used to calculate the CBBI on a case by case basis and analyzed this characteristics through experiment.

• Proceedings of the Korean Geotechical Society Conference
• /
• 2005.03a
• /
• pp.17-24
• /
• 2005

Recently construction activities increase in reclaimed onshore areas. It is therefore considered an important factor for the design of pile foundation with problems in terms of settlements due to soft grounds. Nevertheless the design of piles for negative skin friction(or downdrag forces) is probably poorly understood by many engineers. It is mainly because the most of design specification give a way to design pile foundation in bearing capacity aspect although the negative skin friction is related to settlement(downdrag). Under LRFD(load resistance factor design) approach it is to separately consider ultimate limit state and serviceability limit state. This paper discusses LRFD approach to the design of piles for negative skin friction and compares this approach to traditional design approach. And also a case history is analyzed in that point of view.

• Proceedings of the Korean Geotechical Society Conference
• /
• 2004.03b
• /
• pp.580-585
• /
• 2004

The purpose of this study is the stability evaluation of soil slope according to inclination of upper natural slope. Upper natural slope breeds loss of slope by inflow in slope of surface water by rainfal1 and f1uctuation of amount of materials in slope through method of cutting slope according to degree of inclination. Basis of standard inclination does not consider of inclination of upper natural slope and is presented uniformly. Therefore, in this study, analyzed stability of inclination of upper natural slope through limit equilibrium analysis. Result is same as following. First, safety factor through limit equilibrium analysis is almost direct decrease when gradient of soil slope is 1:1.2, 1:1.5. However, when gradient of soil slope is 1:1.0, 1:0.7, if sinclination of upper natural slope are $20^{\circ}$, it shows tendency that decrease of safety factor becomes low rapidly. Second, when when gradient of soil slope is fixed, inclination of upper natural slope increase tendency(maximum 3.0 times) that decrease of safety factor.

• Proceedings of the Korean Society of Machine Tool Engineers Conference
• /
• 2003.04a
• /
• pp.398-404
• /
• 2003

Most previous researches for the hybrid composite materials such as FRMLs(Al/AFRP, Al/GFRP) have evaluated the fatigue delamination behavior using the traditional fracture mechanism. However, most previous researches have not generally been firmed yet. Because delamination growth behavior in hybrid composite should be consider delamination growth rate, $dA_D$/da using the delamination shape factors, fs instead of traditional fracture mechanic parameters. The major purpose of this study was to evaluate the relationship between delamination shape factor, fs and delamination growth rate, $dA_D$ . And a propose parameter on the delamination aspect ratio, b/a. The details of the study are as follow : 1) Relationship between crack length, a and delamination width,b. 2) Relationship between delamination aspect ration, b/a and delamination area rate,($(A_D)_{N}(A_D)_{ALL}$. 3) Variation of delamination growth rate, $dA_D/da$ was attendant on delamination shape factors, $fs_1$, $fs_2$, $fs_3$. The test results indicated the delamination growth rate depends on delamination shape factors.

• Journal of the Korean housing association
• /
• v.28 no.1
• /
• pp.19-26
• /
• 2017

The purpose of study developing Development evaluation methods of light environment for indoor of middle school based on 'Biophilia'. This study is mainly based on literary review and survey research. To construct structural questionnaire based on 'Light and Space' of Biophilic Design for well being lighting environmental evaluation. We construct structural questionnaire that have 10 evaluation factors and 60 detail evaluation items to evaluate lighting environment for indoor of middle school based on biophilia theory. To survey students' subjective evaluation, the participant of study has been selected with the total number of 232 middle school students. The data were analyzed using Multiple Regression Analysis by IBM SPSS statistics 21. The result of pearson correlation analysis between satisfaction of indoor light environment and school life satisfaction, satisfaction of the whole indoor light environment was found showing positive relationship with school life satisfaction. The results of light environmental evaluation were factor 3,6,8,9 was lower than others. This study was designed to suggesting an evaluation method of light environment of the school. Biophilia theory said when 10 evaluation factor are in harmony, light environment can be well-being. So, factor 3,6,8,9 that are important elements to increase the satisfaction of lighting environment are consider carefully for the plan of indoor lighting environment.

• The Journal of the Korea Contents Association
• /
• v.6 no.2
• /
• pp.136-145
• /
• 2006

To achieve this study, this study divide success factors of ERP implementation into organizational, environmental and information and group system information characteristics into form, content, source and supply frequency of information and is to verify an effect of two factors on system performance(user satisfaction). After selecting 250 SMBs in sample, this study use 79 questionaires for analysis. And all SMBs which was sampled in this study are manufacturing companies and don't consider respondent's position. The results of this study are as follows. First, there is a positive effect of a fit between organizational factors and system information characteristics on system performance. Second, there is a positive effect of a fit between environmental factors and system information characteristics on system performance. and third, there is positive effect of a fit between information factors and system information characteristics on system performance.

• Korean Journal of Human Ecology
• /
• v.18 no.2
• /
• pp.431-439
• /
• 2009

This research aims to invest consumers' purchase behavior and preference of F/W season knit wear to prepare for basic data in producing competitive knit wear which can meet consumers' demands. The results are as follows: 1. Consumers in their twenties are largely purchasing their knit wear at bonded clothing shops, consumers in their thirties at outlet stores and consumers in their forties and fifties at department stores. As for preferred materials in knit wear, the twenties like 100% of cotton, the thirties mixed wool, and the forties and the fifties 100% of wool. Across all age groups, they prefer knit wear pattern with no figures, while they consider its design and color as important factors in purchasing F/W knit wear. 2. As for the wearing sensations of F/W knitwear of three age groups, there are not significant differences in other factors except a factor of 'jacket length'. 3. As for the fitting sensation about F/W knit wear, consumers with 'thin' somatotype feel high comfort in the factor of 'girth', while consumers with standard somatotype feel high satisfaction in the factor of 'length'.

• Korea Journal of Hospital Management
• /
• v.11 no.1
• /
• pp.110-126
• /
• 2006

The purpose of the study is to find the factors influencing small or middle size clinics and hospitals CEOs' expectation level on the affiliation with the large size teaching hospitals. Data for analysis was collected to use self-administrative structured questionnaire on 164 CEOs of small or middle sized clinics and hospitals affiliated with large sized teaching hospital located in Kyung Ki Province. For the study, the researchers develop the constructs for questions on the expectation on the affiliation, the attitude such as confidence, knowledge on the affiliation, previous relationship of the affiliation, and selection guideline of the affiliation with exploratory factor analysis and reliability test. Through the confirmative factor analysis using AMOS 4, the researchers develop constructs based on exact relationship between constructs and questions. CEOs' expectation level on the affiliation is influenced on attitude or confidence, gender, types of clinics and hospitals, distance to the affiliated large hospital, types of recommender, and number of affiliated hospitals. Large sized hospitals that want to affiliation with other clinics and hospitals can promote the affiliation to consider these factors from the results.

• Journal of Families and Better Life
• /
• v.19 no.5
• /
• pp.147-166
• /
• 2001

The Purpose of this study was 1) to analyse the attitudes about Elderly Assisted Living (EAL) among urban Korean 2) to consider the policy implications for elderly communal housing. The research methods used were 1) social survey research with questionnaire to find attitudes and preferences about EAL among potential elderly client in Seoul, Korea 2) interpretative suggestion for appropriate policy implications to facilitate developing EAL in urban Korea. A questionnaire was used to find attitudes/preferences about EAL was adapted from the results of the review about communal housing in the UK. The survey was undertaken from September to October, 2000 in Seoul, Korea. Data was collected from 413 subjects and analysed using various statistical techniques. From the results, location should be differentiated into urban type and suburban type. The urban type would prefer around 5 stories multi-family house style with elevator and suburban type would prefer single detached house style with shared garde. The most preferred characteristics found by factor analysis were factor I named as communal facilities and environment(the items belong to factor I was neighbour environment, communal spaces and facilities, heating system, and elevator). The most important advantages of EAL were social activities and convenience. The most salient disadvantages of EAL were difficulty of family contact. The higher the occupational status and income, the lower the preference for the characteristics of EAL with a preference for finding appropriate living arrangements in present housing market. But the higher the educational level, the higher the degree of preference for the characteristics of EAL.