• Bulletin of the Korean Mathematical Society
• /
• v.45 no.2
• /
• pp.231-239
• /
• 2008

We obtain a necessary and sufficient condition for the existence of Mendelsohn triple systems excluding contiguous units with ${\lambda}$ = 1. Also, we obtain the spectrum for cyclic such systems.

• Journal of Institute of Control, Robotics and Systems
• /
• v.22 no.3
• /
• pp.192-198
• /
• 2016

Motion planning problem is still one of the important issues in robotic applications. In many real-time motion planning problems, it is advisable to find a feasible solution quickly and improve the found solution toward the optimal one before the previously-arranged motion plan ends. For such reasons, sampling-based approaches are becoming popular for real-time application. Especially the use of a rapidly exploring random $tree^*$ ($RRT^*$) algorithm is attractive in real-time application, because it is possible to approach an optimal solution by iterating itself. This paper presents a modified version of informed $RRT^*$ which is an extended version of $RRT^*$ to increase the rate of convergence to optimal solution by improving the sampling method of $RRT^*$. In online motion planning, the robot plans a path while simultaneously moving along the planned path. Therefore, the part of the path near the robot is less likely to be sampled extensively. For a better solution in online motion planning, we modified the sampling method of informed $RRT^*$ by combining with the sampling method to improve the path nearby robot. With comparison among basic $RRT^*$, informed $RRT^*$ and the proposed $RRT^*$ in online motion planning, the proposed $RRT^*$ showed the best result by representing the closest solution to optimum.

• Communications for Statistical Applications and Methods
• /
• v.17 no.5
• /
• pp.725-731
• /
• 2010

Economic Reliability test plans(ERTP) are proposed considering that the life time of the submitted items follow the Pareto distribution of the second kind. For various specified acceptance number, sample size and producer's risk, a minimum test termination time is obtained. A comparison of proposed plan has been made with the existing plan developed by Aslam et al. (2010). The results are explained by tables and example.

• Journal of the Korean Society of Clothing and Textiles
• /
• v.17 no.3
• /
• pp.359-366
• /
• 1993

The purpose of this study was to classify college women according to the general life style, to examine the differences in the characteristics of time consumption, and clothing purchasing behavior, and ultimately to verify the importance of the time variable in life style analysis. 449 subjects were gathered through convenience sampling method and, frequency, precentage, average, $x^2$-test, t-test, ANOVA, Duncan's multiple range test, Factor Analysis, Cluster Analysis were conducted for data analysis. Results of the study were as follows : 1. College women were classified into five subgroups by cluster analysis : fashion-pursuit group, home-intended group, outer-intended group, conservative-economy group, and passive-inactive group. 2. In case of time consumption patterns, significant differences were found according to the different groups in patronage of library and extra off-campus educational programs, participation in household duties, consumption patterns of leisure time and participation in clubs. 3. In case of clothing purchasing behavior, significant differences were found according to the different groups in clothing purchasing motives, information sources, purchasing plan, the number of visited stores, and the confirmation of labels.

• Journal of Society of Preventive Korean Medicine
• /
• v.20 no.1
• /
• pp.1-10
• /
• 2016

Objectives : The purposes of this study were to investigate the recognition of Mibyeong, symptom, management plan and correlation between quality of life and health condition, and to suggest a plan for managing Mibyeong status. Methods : Participants were recruited based on the same sampling methods used on the previous study performed in 2013 based on area, gender and age. Questionnaires were collected by Gallup Korea professional surveyor through face-to-face interviews. The questionnaires contain questions about the recognition of Mibyeong, symptom, management plan and the quality of life in accordance with the relevant health conditions. Descriptive statistics were used for data analysis and the results were expressed as percentage ratios (%). Results : 1,100 of people were acquired in 2015. The responses for "First time to hear of Mibyeong" have shown that the percentage were reduced from 80% to 67% compared with 2013 data. The ratio of Mibyeong's symptoms in 2015 were similar to 2013. we suggested some ways to deal with the Mibyeong status including behavior adjustment (non smoking, non alcohol, control sleep pattern), herbal tea, health functional food, exercise, preventive health care (qi-gong, yoga), meditation, home health care medical device (hot-pack, seat device for fumigation, massager), and medical service (hospital, medical clinic oriental medical clinic). Almost people showed that positive opinion with them. There were significant correlation between quality of life with the health status rather than Mibyeong or disease group. Conclusions : This study was performed through scientific questionnaires collected in 2013 and 2015 to investigate people's understanding of Mibyeong as a present condition in Korean public. Some questions had significantly different responds between both years while others showed similar trends for both years. These results suggest that the concept of Mibyeong in oriental medicine could provide a management mechanisms that help people to manage the Mibyeong status.

• Convergence Security Journal
• /
• v.14 no.6_2
• /
• pp.15-24
• /
• 2014

This research aimed at investigating the relation between police officer's organizational learning and organizational effectiveness based on hypothetical model about the influence of police officer's organizational learning on organizational effectiveness. In order to achieve this purpose, the researcher selected 163 police officers as the test group, who are in active service at Gwangju District Police Agency from July 14~August 15, 2013. As the sampling method, the researcher used random sampling method and conducted a survey based on self-administrated method, and the finally analyzed data was analyzed through SPSS for Win Version 17.0 statistical program. The research results are as follows. First, it was comprehended that police officer's higher level of organizational learning influenced organizational commitment more, lower factor of organizational effectiveness, significantly. Second, it was analyzed that police officer's learning ability significantly influenced job satisfaction, lower factor of organizational effectiveness, besides organizational commitment.

• Research in Community and Public Health Nursing
• /
• v.10 no.1
• /
• pp.227-238
• /
• 1999

The goal of this study is to discover the effect of sex education on sex-related knowledge and attitudes of middle school girls. Non-equivalent control group pretest-posttest design was used. The number of experimental group students was 134 and the number of control group students was 134. A total of 268 second grade middle school girls were selected for a convenience sampling method. This study was carried out in a middle school located in Taegu City, Korea, from February 5 to February 18, 1998. To des cover the needs of sex education, the researcher sent a predesigned questionnaire to 1464 girls in 19 different middle schools. The sex education curriculum was designed on the basis of this survey's results. 'The Sex Education Teaching Plan' (published by the Research Institution of Korean School Health Education) and 'Sex and Happiness' (published by the Seoul City Education Ministry) were used to redesign the sex education curriculum and content. Fifty minute long sex education classes were taught to the experimental group every other day and the total number of classes was five. The contents of the teaching -learning plan for sex education were: 'The Characteristics of Adolescence', 'Pregnancy and Contraception', 'Friendship with the Opposite Sex and Prevention of Sexual Violence', 'Prevention of Venereal Disease', and 'Sex and Society'. To measure the degree of sex knowledge of the subjects, the researcher used the modified sex knowledge tools of Kim(l995) and Han(1997). The reliability values of these sex knowledge tools range from 0.71 to 0.74, using Cronbach's alpha. To measure the degree of sex attitude in the subjects, the researcher used the modified sex attitudes tools of Han(l997). The reliability values of these sex attitude tools range from 0.73 to 0.78 using Cronbach's alpha. The PC-SAS package program was used to analyse the data along with Frequency, Percentage, XLtest, t -test, and a paired t -test The results of this study were as follows; 1. The first hypothesis was accepted. The experimental group showed more change in sex - related knowledge than the control group(t =22. 76, p=0.0001). 2. The second hypothesis was accepted. The experimental group showed more change in sex-related attitudes than the control group (t=11.91, p=0.0001). In conclusion, the level of sex-related knowledge and sex-related attitudes of middle school girls who received sex education was higher than that of the girls who did not receive sex education. According to this research, planned sex education was effective in forming accurate knowlege and appropriate attitudes related to sex. Clearly, we must carry out a well-designed step by step sex education program that is well-suited to the sex education needs and the developmental level of the students.

• Fire Science and Engineering
• /
• v.34 no.1
• /
• pp.115-120
• /
• 2020

This study aimed to assist the improvement of organizational commitment and the preparation of an action plan regarding support from the organization by examining the effects of organizational culture types and perceived organizational support on firefighters' organizational commitment. To this end, 205 fire-fighting officers from the northern area of Gyeonggi-do were surveyed using the purposive sampling method. The results demonstrated that among organizational culture types, the perception of group culture, rational culture, and organizational support held by firefighters had a significant influence on their organizational commitment. Based on these results, this study suggested various support plans at the organizational level for stimulating group culture and rational culture among firefighters, and improving organizational commitment.

• Korean Journal of Health Education and Promotion
• /
• v.12 no.1
• /
• pp.3-21
• /
• 1995

This survey was carried out with random sampling from 7 koos in Seoul (Seodaemoonkoo, Mapokoo, Kangdongkoo, Seongdongkoo, Koorokoo, Yongsankoo and Seongbookkoo. in order to evaluate the present health education needs of the aged and to find out the alternative plan for improvement. It used closed questionnaire. The number of the surveyed is 580. The brief results and suggestions of this study are as follows: 1. There is high level of health education needs of the aged in Seoul. 2. There is little activity of health education from the Ministry of Health and Social Affairs. 3. They like lectures and group guidances best of all the ways of health education. 4. They like pavilions of the aged best of all the places of health education. 5. They like to receive health education once a month for about an hour. 6. They need the public relations and education of accident-preventive behaviors as well as the improvement of accident-prone environment and complementary policy measures, especially securing an actually ample budget. 7. Health education for the aged should take convenience and accessibility into account.

• Human Ecology Research
• /
• v.53 no.4
• /
• pp.375-390
• /
• 2015

This study was designed to understand the residential experience of Korean women living in tropical country. For qualitative research, interviewees were selected by snowball sampling among Korean women living in Malaysia for over 20 years. The selection criteria for interviewees included husband's nationality, occupational experience, future living plan, frequency of travel to Korea. In-depth group and individual interviews were conducted from August 23 to October 7 2014. Subsequently (1) interviewees' general residential experiences in Malaysia were summarized, (2) interviewee's identity and lifestyle with housing pathways approach were clarified, (3) interviewees' residential experiences in 5 issues, reciprocity in residential area, intention of environmental change, meaning of housing and interaction, housing adaptation, and residential satisfaction/dissatisfaction were prescribed and interpreted. In conclusion, the reflection of interviewees' experiences in tropical country, suggested variations of housing structure type within a residential complex, air well and pocket by setback in building block for improving ventilation and noise prevention from neighbors, and ceiling fans in the house were suggested for the upcoming subtropical climate in Korea. Full option and minus options were also suggested for the presale market to reduce before occupancy remodeling needs. The research results implies valuable suggestions for a multicultural society, ecological housing and stronger communities.