• Advances in nano research
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• v.7 no.6
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• pp.405-417
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• 2019

This research is devoted to study post-buckling analysis of functionally graded carbon nanotubes reinforced composite (FG-CNTRC) micro plate with cut out subjected to magnetic field and resting on elastic medium. The basic formulation of plate is based on first order shear deformation theory (FSDT) and the material properties of FG-CNTRCs are presumed to be changed through the thickness direction, and are assumed based on rule of mixture; moreover, nonlocal Eringen's theory is applied to consider the size-dependent effect. It is considered that the system is embedded in elastic medium and subjected to longitudinal magnetic field. Energy approach, domain decomposition and Rayleigh-Ritz methods in conjunction with Newton-Raphson iterative technique are employed to trace the post-buckling paths of FG-CNTRC micro cut out plate. The influence of some important parameters such as small scale effect, cut out dimension, different types of FG distributions of CNTs, volume fraction of CNTs, aspect ratio of plate, magnitude of magnetic field, elastic medium and biaxial load on the post-buckling behavior of system are calculated. With respect to results, it is concluded that the aspect ratio and length of square cut out have negative effect on post-buckling response of micro composite plate. Furthermore, existence of CNTs in system causes improvement in the post-buckling behavior of plate and different distributions of CNTs in plate have diverse response. Meanwhile, nonlocal parameter and biaxial compression load on the plate has negative effect on post-buckling response. In addition, imposing magnetic field increases the post-buckling load of the microstructure.

• Journal of the Korean Institute of Telematics and Electronics B
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• v.29B no.11
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• pp.16-21
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• 1992

The validity of the application of the second-order Born equation to the ultrasound tomography algorithm is studied by comparing the scattered fields computed using the first-order Born equation, the first-order Rytove equation, and the second-order Born equation. The second-order Born equation turns out to provide more desirable results than the other two equations for a certain group of test objects. Phantom images with resolutions upto 1 pixel$\times$1 pixel are satisfactorily reconstructed using the second-order Born equation. It is shown that when the view angle is limited, good resonstruction results are also obtained using multi-frequency incident fields.

• Journal of the Korean Society for Precision Engineering
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• v.23 no.1 s.178
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• pp.105-112
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• 2006

The nonlinear damping force model is made to identify the properties of the ER (electro-rheological) fluid suspension damper. The instrumentation is carried out to measure the damping force of the ER damper. The higher order spectral analysis method is used to investigate the nonlinear frequency coupling phenomena with the damping force signal according to the sinusoidal excitation of the damper. The distinctive higher order nonlinear characteristics are observed. The nonlinear damping force model, which has the higher order velocity terms, is proposed with the result of higher order spectrum analysis. The higher order terms coefficients, which vary according to the strength of the electric field, are calculated using the least square method.

• Journal of the Korean Society of Food Culture
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• v.17 no.3
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• pp.309-314
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• 2002

The purpose of this study was to investigate several aspects of eating out behaviors especially in relation to Chinese food. Self-administrated questionnairs were completed by 556 food-related major college students in Kangwon-do area. The results were as follows: 1. The frequencies of eating out were not significantly different by gender, type of residence, and the amount of spending money per month of the subjects. 2. Korean foods had a tendency to be selected as a first choice of eating out with both family and friends. The subjects preferred Korean foods, Western foods, Chinese foods and Japanese foods in order with their family but flour based foods, western foods and chinese foods in order with their friends. Japanese foods were not selected at all when they ate out with friends. 3. The 80.7% of male subjects and the 58% of female subjects liked Chinese foods. High calorie food was the feeling about Chinese foods for the male subjects and greasy food was for the female subjects. Taste was the most considered factor for choosing Chinese foods. 4. The 80% of subjects answered that Chinese food culture affected that of Korea. The 77% of subjects thought Chinese noodles were settled down to Korea. 5. Using MSG to Chinese foods was recognized as health-concerning factor for 67% of male subjects and 72% of female subjects.

• Fashion & Textile Research Journal
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• v.6 no.6
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• pp.707-714
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• 2004

This study was carried out to research the actual condition of narrator models' wearing uniform, targeting on the narrator models who are being currently active and are from 19-year-old to 30-year-old. A poll was performed through visiting internet circles and spots, and the characteristic of objects, the form of uniform, attitude on uniform, dissatisfaction index on wearing uniform and preference index on wearing uniform were researched. It was carried out from August 18, 2003 to August 31, 2003. In order to perform this study, 161 questionnaires were used in all, and frequency analysis was implemented using SPSS 10.0. The objects of study were composed of female. Those who are from 21-year-old to 25-year-old accounted for 74.5%, and those who have career from 2 years to 3 years accounted for 75.5%. In respect to attitude on wearing uniform, affirmative answers, affirmative answers, such as a sense of belonging, a pride in activity and increase of efficiency, accounted for 68.8%. On the other hand, in respect to a harmonization between uniform and work, just the 39.8-percent showed affirmative reaction. Concerning the functionality of uniform, such as retaining warmth and ventilating, dissatisfaction index showed very high value; it is judged that it should be improved henceforth. Working postures were researched, following the order of standing posture and arm-using posture. In inconvenient actions, bending down and moving arms were orderly pointed out. With regard to the dissatisfaction of size, busts, the length of skirt and waist girth were orderly pointed out. Likewise, considering the parts of which room is required, bust, hip girth and waist girth were orderly pointed out. As to the points that should be bettered, design and functionality were orderly pointed out. In respect to materials of uniform, sweat-absorption material, light material and well-ventilated material were orderly suggested.

• Journal of the East Asian Society of Dietary Life
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• v.10 no.3
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• pp.179-189
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• 2000

Changes in eating culture patterns has been observed among modern Koreans from seeking out traditional types of eating out restaurant to the modern, luxurious, and hybrid food. This study aimed to investigate the patterns of eating out and preference of food in Pusan National University (PNU) area, representing typical Patterns of eating out in Pusan. Data revealed that the most popular places in which the subjects visited were Korean traditional restaurants and snack bars. The names of the places were in trendy style of Korean connotation, with Intention to appeal to the new generation. The interviewee reported that decision making on choice of plates were made by taste, price, and service in that order. The frequency of eating out was once In two or three days, Korean traditional restaurants, noodle shops, and restaurants of offering fusion food being the Place of choice. Preferred reasons for the PNU area were reported to be low price, followed by variety of food offered and geographical accessibility to the places. Most of the interviewees in the area were satisfied with the taste of food and service quality. A list of food they were willing to introduce to oversea foreigners included raw fish, Dongrae Pajon, Pulgoki, Kimchi and dog soup in that sequence. The results of survey indicator that changes in the eating out environment in Pusan were improvement of service quality, development of new recipes, improvement of hygiene standards and development of area-specific food. The results may also act as a guide in changing the eating out environment and developing tourism in Pusan.

• Journal of agricultural medicine and community health
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• v.15 no.1
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• pp.41-48
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• 1990

In order to find out the status of health care of the old aged people (age of 65 and over) in a rural area, a study was carried out, through analyzing the data of health care clinic for 207 old aged people with geriatric diseases, and of questionnired survey for 84 old aged people with geriatric diseases in a rural community. Su Dong-Myun. Nam Yang Zu-Gun, Kyung Gi-Do, Korea, during the year of 1989. The following results were obtained. 1) The composition rate of population of age of 65 and over was 9.8% in total, and sex-specific composition rate was 9.3% in male and 10.4% in female. 2) Utilization rate of health care clinic for old aged people with geriatric diseases was the highest rate with 37.9%, through individual letters at the first time, and showed gradually decreasing tendency afterward. 3) In the means of utilization advices to health care clinic for the old aged people. the individual letters(37.9%) at the first time were more effective than public information of the old aged hall or/and Myun office(18.4%). 4) In opinion on utilization of health subcenter-health care clinic for the old aged people "will utilize"(59.5%) was the highest and "do not know"(26.2%) "be difficult to utilize" (9.5%) and "will not utilize"(4.8%) were in the next order. 5) Out of 84 respondents, the old aged people With geriatric diseases, 73.8%(about three-fourths) of them answered "their diseases to the aggravated" (29.8%) "not to be changed"(25.0%) and "to be unknown"(19.0%), and the others(26.2% of them) "to be changed for the better". 6) Out of 62 respondents(the old aged people), answered their geriatric diseases not to be changed for the better, "no curative effect" was the highest with 43.5% of them. "could not know" (33.9%), "would not treat"(19.4%) and "could not be treated"(4.8%) were in decreasing order. 7) The old aged people, responded their diseases to be changed for the better, answered that they(patients) should make themselves(68.2%) responsible for basic effort of health care. However the old aged people responded their diseases not to be changed for the better answered that they should impute the responsibility of basic effort for health care to medical facilities or other conditions(63.0%). 8) In the reason of failure that the old aged people responded their geriatric diseases not to have curative effect, mis-control of regular habits of daily life was the highest(57.1%), and failure of taking selected medicine steadily(28.6%), and abuse of medicines(14.3%) were in decreasing order. 9) The reason order of being changed for the better that the old aged people responded their diseases to have curative effect, was keeping and control of regular habits of daily life (46.7%), taking selected medicines steadily(33.3%) and others (20.2%) respectively. 10) The courses of geriatric diseases itself are so chronic, duplicate and uncertain, and the old aged people activities for disease control are so slow, various and uncertain that continuous health education in home or/and community unit must be essential factors for effective geriatric health care.

• Culinary science and hospitality research
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• v.9 no.4
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• pp.136-151
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• 2003

The summarized analysis result of this research is as follows. First, regarding the difference of preceding variable and dependent variable, statistically considerable difference did not appear between self determination and personal relations in educational background and between groups of self determination in hotel type, and statistically considerable difference appeared among other groups. Second, regression analysis result between empowerment and job satisfaction turned out that statistically considerable influence is exerted in the order of personal relations ability, influence power, role performance ability and self-decision nature. Third, regression analysis result between empowerment and job devotion turned out that statistically considerable influence is exerted in the order of personal relations ability, role performance ability and influence power. Fourth, regression analysis result between empowerment and organization devotion turned out that statistically considerable result is exerted in the order of influence power and personal relations ability. Fifth, it turned out that statistically relative high correlation existed among correlation of empowerment and result variable such as job satisfaction, job devotion and organization devotion. The above-mentioned matters considered, this research proposes following points. This research examines the effect of empowerment on job satisfaction and organizational commitment of culinary staff in the hotel. the effect of the variable of empowerment on result variable shows that role performance ability, influence power and personal relations ability are important variables. Therefore, to improve the role performance ability of members of kitchen, it is essential for each individual to improve their ability and to have confidence at the time of business performance. So, this research implies that consistent and systematic training is necessary for increasing the ability and confidence. In order to improve influence power, it is necessary for members of an organization to have strong faith that their jobs determine the success of the company, and to increase the sense of self-control by letting them have the right of self determination, so that all members may have strong desire to transact business. This research implies that in order to improve personal relations ability, it is necessary for members of an organization to discover the best method of decision-making and solve problems through members' developing mutual action, and for managers to take personal characteristics into account so that members may have belief and confidence in their job and realize the value of their job. In conclusion, the person in charge of personnel affairs and the manager in charge of kitchen need to realize the importance of empowerment and especially have an much interest in all parts including self determination, influence power and role performance ability and personal relations ability etc.

• Journal of Korean Society of Water and Wastewater
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• v.29 no.5
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• pp.583-590
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• 2015

Evaluation and comparison for the performance on the contracting-out became possible after the introduction of the performance indicators(PIs) in 2012 in Korea, And local governments and private companies are utilizing them as evaluation data to enhance the performance of the contracting-out. Several revisions on performance indicator were carried out by expert group on contents validity of PIs, But the review of the composition validity of PIs was not sufficient. In this study, the applicability, distinction ability and composition validity of PIs is evaluated by statistical method. From the results, Improvement of indicator is required in order to increase the interrelationship among indicators to enhance the compostion validity of indicators related with operation, sludge and water reuse.

• Proceedings of the KSME Conference
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• 2003.11a
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• pp.1690-1695
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• 2003

In order to investigate the mechanism of brake squeal noise, the sound and vibration of an actua1 brake system were measured using a brake dynamometer. The experimental results show that disc run-out varies with brake line pressure and the factor of squeal generation is the run-out due to the misalignment of brake disk. A three degrees of freedom friction model is developed for the disk brake system where the run-out effect and nonlinear friction characteristic are considered. The results of numerical analysis of the model agree well with the experimental results. Also, the stability analysis of the model was performed to predict the generation of brake squeal due to the design parameter modification of brake systems. The results show that the squeal generation depends on the nm-out rather than the friction characteristic between the pad and the disk of brake.