• Bulletin of the Society of Naval Architects of Korea
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• v.26 no.1
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• pp.46-62
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• 1989

This paper presents the results of full-scale structural measurements of 4,800 unit pure car carriers "HYUNDAI NO.103" and "HYUNDAI NO.105" on one voyage respectively for each ship, especially in order to investigate the local strength of partial bulkhead above free-board deck. With the measured data, the short-term frequency analyses have been performed. The results show that the wave-induced stresses follow, on the whole, well the Rayleigh distribution. In addition, it has been found from the measured data that transverse local stresses at bulkhead section have a very close relation with the acceleration in athwartship direction. Finally, the long-term analysis has been attempted by using the following two statistical distributions mainly in order to estimate the maximum stress amplitude at the corners of partial bulkhead. 1) Exponential distribution of cycles of stress amplitude 2) Double exponential distribution of extreme values of stress amplitude for each short-term analysis The results of these two cases show a good agreement with each other. For example, the estimated maximum stress amplitude for 10 years at port-side corner of Fr. 132 partial bulkhead is $2125kg/cm^2$ for the first case and $2170kg/cm^2$ for the second case just based on the measured data.

• Proceedings of the KSR Conference
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• 2008.06a
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• pp.1781-1788
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• 2008

This report is the result of a basic experiment done on a mock-up tunnel, of what happens to the ventilated flow and fire driven flow inside a railway tunnel as the current inside the tunnel changes when an anti-smoke or a radio frequency invert control is installed. The duct used in this experiment is 10m in length, 0.5m in height and 0.25m in width and made of acrylic. An anti-smoke system with a motor that can produce current of 10m/sec maximum in order to create ventilated flow, has been installed. A honeycomb has been installed at the entrance of the duct to create a current flow that exists in tunnels. In order to create a ventilated flow, a current of 4m/s, 6m/s and 8m/s were generated using the anti-smoke system, as the study of current developed. A Hot-wire(TSI) and Pressure sensor(ENDEVCO) was installed in the duct, 1m apart, as the measurement of current and pressure went on. The current and pressure were automatically measured through the Lap View program and PC; the current flow in the mock-up tunnel generated by the honeycomb has been analyzed the pressure distribution and pressure drop has been analyzed.

• Physical Therapy Rehabilitation Science
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• v.6 no.2
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• pp.90-95
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• 2017

Objective: The purpose of this study was to investigate the physical therapists' perception of the use of gait measures, the frequency of the gait measures used, and also to identify the barriers that limit the use of these assessment tools. Design: Cross-sectional study. Methods: Physical therapists from the Seoul, Gyeonggi area from March to July 2016 were included in the study. Over the course of 18 weeks, a cross-sectional study was conducted with a self-report questionnaire. A total of 700 questionnaires were distributed and 350 questionnaires (50%) were collected, however with the exclusion of 140 questionnaires due to non-consent, a total of 210 questionnaires (30%) were analysed. Results: Out of the 10 standardized assessment tools, the therapists showed the highest perception for the timed up and go test (TUG [n=153, 72.9%]) and they also had high perception for the 10 meters walk test (10MWT [n=149, 71.0%]), and 6-minute walk test (6MWT [n=123, 58.6%]). The respondents answered that the TUG (n=116, 55.2%), 10MWT (n=100, 47.6%), and 6MWT (n=51, 24.3%) was used the most often. On the contrary, only four (1.9%) therapists have used the Chedoke-McMaster stroke assessment and the Rivermead Mobility Index. The lack of time was considered as the most important barrier to the use of assessment tools in clinical practice. Conclusions: Through this study, it has been shown that the domestic physical therapists used the TUG and the 10MWT mainly due to high recognition and evaluation status; however, the lack of time was the greatest impediment to the clinical application of the gait assessment tools.

• Journal of dental hygiene science
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• v.15 no.6
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• pp.696-702
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• 2015

The purpose of this study was to evaluate the effect of oral health education with Q-scan for preschool children. The 59 children were divided into two groups, one with Q-scan and the other with dentiform, and they were evaluated by interview questionnaire and measurement of dental plaque index using Quigley-Hein index. Using SPSS ver. 18.0 for statistical analysis, paired t-test and Independent t-test were carried out for dental plaque index change and chi-square independence test for change between before and after oral health education. The result of this study revealed that the dental plaque index of the children showed significant decrease of 12% more in the experimental group (p<0.001). Both groups showed significant difference in knowledge about fluorine (p<0.05) and the percentage of correct answers showed significant increase in questions about bad food for teeth (p<0.05). In attitude toward oral health, the experimental group showed significant difference in every variable (p<0.05), and the control group showed significant difference in regular oral examination and frequency of toothbrushing (p<0.05). The experimental group showed significant result (p<0.05) with increase in the percentage of correct answers for the question about how to hold a toothbrush and decrease in the percentage of correct answers for the question about how to apply toothpaste, while the control group did not show significant difference in any variable. Therefore, Q-scan as an appropriate tool for motivation, provides effective educational methods in oral health education.

• Korean Journal of Optics and Photonics
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• v.19 no.1
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• pp.68-72
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• 2008

Fiber-optic strain sensors based on Bragg reflection gratings produce the change of reflection spectrum when an external stress is applied on the sensor. To measure the Bragg reflection wavelength in high speed, an arrayed waveguide grating device is incorporated in this work. By monitoring the output power from each channel of the AWG, the peak wavelength corresponding to the applied strain could be obtained. To enhance the accuracy of the AWG wavelength interrogation system, a chirped fiber Bragg grating with a 3-dB bandwith of 5.4 nm is utilized. The high-speed response of the proposed system is demonstrated by measuring a fast varying strain produced by the damped oscillation of a cantilever. An oscillation frequency of 17.8 Hz and a damping time constant of 0.96 second are obtained in this measurement.

• Korean Journal of Optics and Photonics
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• v.28 no.1
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• pp.22-27
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• 2017

Time-encoded near-infrared spectroscopy (NIRS) system is proposed, based on a near-infrared (NIR) swept laser source, for comparison to the conventional NIRS method using a detector-type spectrometer. The cavity of the NIR swept laser source consists of a semiconductor optical amplifier (SOA) with a gain region around 800 nm, and several fiber-optic components. To change the output wavelength in time using an applied electric radio-frequency signal, an acousto-optic tunable filter (AOTF) is introduced in the fiber ring cavity configuration. To demonstrate the feasibility of an NIR swept laser source for NIRS imaging, the spectroscopic comparison of two kinds of absorbance-measuring systems a detector-type spectrometer using a white light source, and a source-type spectrometer using an NIR swept laser is successfully performed with an NIR-absorbing dye.

• Journal of Digital Convergence
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• v.10 no.11
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• pp.459-465
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• 2012

This study has investigated the effect of isometric contractile force and muscle activity applying ice and hot according to the time from the biceps brachii muscle. In this study, 20 university students participants without musculoskeletal and neurological disorders. By applying a hot pack 5 min, 10 min, 20 min and 30 min respectively and ice pack for 5 min, 10 min, and 20 min respectively. After that measurement are skin temperature, contractile force and muscle activity. Skin temperature of the hot and cold 5 min applied that rapidly changing. Increasing the time it takes to apply a variance has been reduced(p<.001). Isometric contractile force was not statistically significant but highest when applying the hot pack 5 minutes and lowest when applying the hot pack 30 minutes(p<.001). Muscle activity and median frequency was highest when applying the hot pack 5 minutes. To analyze the above results, it was found that isometric contractile force and muscle activity changed according to the applying time. These result lead us to the conclusion that this study will be more evidence for changes in muscle contraction to apply hot pack and ice pack on clinic.

• Korean Journal of Human Ecology
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• v.2 no.1
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• pp.45-51
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• 1993

The purpose of this study is to provide some information for the proper education on clothing wearing habits so that the education may be performed in the direction of social needs according to the social change and in the direction of the needs and interest of the high school girl students in their adolescence by being conscious of the influence of clothing on the high school girl students. I have used questionaire as an instrument of measurement. The length of the time of survey is from February 11, 1991 to February 28. The subjects are 544 first grade girl students of general high schools in Cheong-Ju, Choong-Ju, and Je-Cheon. The analysis of the data includes frequency, percentage, average person's Correlation Program, t-test, ANOVA, Scheffe's test. The conclusion of this study is as follows: The first, it is shown that (l)students's interest in the design and fashion of clothing is significantly related to the socio-anthropological and socio-psychological factors such and the education level of their fathers, the education level of their mothers, monthly income of their homes, the clothing habits of their home economics teachers, the subjects which they are interested in, their average scholoary achievements, their religious background, and whether they have boy friends or not, etd. (2)students' interest in purchasing of clothing is significantly related to the socio-anthropological and socio-psychological factors such as the education level of their fathers, the education level of their mothers, monthly income of their homes, the clothing habits of their home economics teachers, the subjects which they are interested in, their average scholoary achievements, and whether they have boy friends or not, etc. (3)students' interest in the social-psyclological aspect is significantly related to the socio-anthropological and socio-psychological factors such as their living area, the clothing habits of their home economics teachers, etc. (4)students' interest in the clothing construction is significantly related to only the clothing habits of their home economics teachersl. (5)students' interest in the clothing management is significantly related to the socio-anthropological and socio-psychological factors such as the education level of their parents, the age of their mothers, their religious background, and their sisters. The second, as for the interest of the high school girl students in clothing, it has been shown that those who wear school uniforms tend to have more interest than those who wear free-choice clothes in such areas as shopping, the construction, and management. As for the other two areas, that is, disign and fashion, and the interest in socio-psychological dependence there has been little meaningful difference between the two groups, while the uniform group has shown more interest than the other group. The third, the interest of hish school students in clothing is considered to be most seriously influenced by their socio-psychological dependence out of five areas of interest. It has been shown that the proportion of the content dealing with clothing wearing life in the high school home economics texbooks in relatively small, especially in such areas as socio-psychological dependence, shopping, management, and design and fashion except in construcion.

• The Journal of the Korea Contents Association
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• v.15 no.5
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• pp.444-454
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• 2015

This study reports on initial founder performance and satisfaction that is affected by mentoring skills and mentoring functions. Through the empirical analysis, seen the initial founder performance and satisfaction as a respective dependent variable, this study intends to provide efficient direction of the responsibility mentor and present a method that enhances the survival of the initial start-up founder. The frequency analysis was conducted to determine the general characteristics of the sample, by leveraging the statistical package SPSS 20.0 for Windows program, details of the items measuring tools present a statistical analysis of sample data, 120 people have gathered in the survey data for this factor analysis was performed with a correlation to classify each region was calculated to Cronbach's ${\alpha}$ factor to determine the reliability of the measurement tool, and tested the hypothesis using linear regression analysis for verification. Was found to play an important role to draw the founder and mentor mentoring skills and capabilities in early stage start-ups, and conclusions drawn from this process. In particular, modeling of the mentor with a sound mind and behavior brought the better performance and satisfaction of the initial start-up founder. If a mentor provides mentoring with more interests in career development and psychosocial functions of the mentoring functions, it is seen to be more efficient way to improve survival rate of initial start-up as well as increasing a founder's performance and satisfaction.

• Journal of Convergence for Information Technology
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• v.10 no.11
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• pp.156-167
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• 2020

The purpose of this study is to analyze the influence of the mindset on stress and job performance. For the analysis, a questionnaire is conducted for cabin crew members in K airlines, and a total of 266 copies are used for the final analysis. To verify the hypotheses of the study, frequency analysis, exploratory factor analysis, reliability analysis, confirmatory factor analysis, measurement model analysis, validation of the measuremen model, and structural equation model analysis are used based on the questionnaire. First, it is confirmed that the mindset had a negative (-) effect on the cabin crew's role stress, reward stress and relationship stress. Second, it is found that cabin crew's reward stress have a negative (-) effect on job performance. On the other hand, relationship stress is found to have a positive influence on job performance and there is no significant result in effect with role stress. Third, the mindset showes a significant positive impact relationship on job performance. As a result, it is necessary to introduce a mindset intervention program so that it can be applied in practical work. These research results confirm the positive effects of mindsets and show that they contribute to organizational performance. In addition, it is necessary to prepare a program to change the mindset of airline cabin crew and to be applied in actual work.