• Korean Journal of Optics and Photonics
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• v.15 no.5
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• pp.423-428
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• 2004

The development of a compact and high performance MWIR thermal imaging sensor based on the SOFRADIR 320${\times}$240 element IRCCD detector is described. The sensor has 20 magnification zoom optics with the maximum 40$^{\circ}$${\times}$30$^{\circ}$ of super wide field of view and 7.6 cycles/mrad of resolving power with the operation of attached micro-scanning system. In order to correct nonuniformities of detector arrays, we have proposed a multi-point correction method using defocusing of the optics and we have acquired the highest quality images. The MRTD of our system shows good results below 0.05K at spatial frequency 1 cycles/mrad at narrow field of view. Experimental data and obtained performances are presented and discussed.

• Nuclear Engineering and Technology
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• v.48 no.4
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• pp.859-869
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• 2016

Component-scale modeling of boiling is predominantly based on the Eulerian-Eulerian two-fluid approach. Within this framework, wall boiling is accounted for via the Rensselaer Polytechnic Institute (RPI) model and, within this model, the bubble is characterized using three main parameters: departure diameter (D), nucleation site density (N), and departure frequency (f). Typically, the magnitudes of these three parameters are obtained from empirical correlations. However, in recent years, efforts have been directed toward mechanistic modeling of the boiling process. Of the three parameters mentioned above, the departure diameter (D) is least affected by the intrinsic uncertainties of the nucleate boiling process. This feature, along with its prominence within the RPI boiling model, has made it the primary candidate for mechanistic modeling ventures. Mechanistic modeling of D is mostly carried out through solving of force balance equations on the bubble. Forces incorporated in these equations are formulated as functions of the radius of the bubble and have been developed for, and applied to, low-pressure conditions only. Conversely, for high-pressure conditions, no mechanistic information is available regarding the growth rates of bubbles and the forces acting on them. In this study, we use direct numerical simulation coupled with an interface tracking method to simulate bubble growth under high (up to 45 bar) pressure, to obtain the kind of mechanistic information required for an RPI-type approach. In this study, we compare the resulting bubble growth rate curves with predictions made with existing experimental data.

• Journal of muscle and joint health
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• v.9 no.2
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• pp.154-165
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• 2002

Purpose: The purpose of this study was to find out long-term effects of the self-help program including the stretching exercise of patient with fibromyalgia, Our findings will have the way for the nursing intervention for reduction of fibromyalgia symptoms and physical disability. Method: The research design was pre-post test design of an experimental group. 41 subjects with fibromyalgia were subjected to our study. Participants of this program were participated with a group of 8 to 12 members with duration of two and half hours for two years(March. 1998 to January. 2000). The Self-efficacy was measured by the Self-efficacy scale. Symptom was converted to scores based on visual analog scale. Physical disability was measured with questionnaires prepared by researchers of this study. Data were collected by the structured interview using questionnaires after self-help program and after 8 months. Data were analyzed by frequency, $x^2$-test and repeated t-test using SPSS 11.0 for windows. Result: Daily activities were not changed but self-described symptom was changed after 8 months. After 8 months, exercise performance along with taking drugs showed significantly lowering trend with respect to self-help program. Relieved symptom of patient with fibromyalgia has continued until 8months after 6weeks program of self-help. Also Promoted self-efficacy of patient with fibromyalgia continued after 8months. After 8 months, in self-described physical disability has showed significantly worse off than after self-help program. Conclusion: In this study, the long-term effects after self-help program for fibromyalgia have showed all symptoms and self-efficacy except exercise performance and physical disability. Therefore, it will be desirable that application of the follow up program with peer group meeting.

• Magazine of the Korean Society of Agricultural Engineers
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• v.29 no.4
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• pp.93-105
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• 1987

This Study was carried out at the experimental Plot of Kang-Weon Province, Institute of Agriculture experiment, to find out Irrigation Water requirement and suitable calculating formula of evapotranspiration on Spreading Varieties of rice plant such as Seul Oak, Bokkwang and Teaback in Chuncheon Area. The evapotranspiration, infiltration, and consumptive use of water were measured by Micro Lysimeter for four years from '86yr. Also, yield of rice was investigated during same period. With the Kc Value taken from experimental value, evapotranspiration was calculated by methods of Blaney & criddle, Penman, Hargreaves and Thornthwaite by Computer using meteorological data in Chuncheon Area for twenty one yrs from '66yr to '86yr. All analyses were conducted based on average value of experiment for four years and the results are summarized as follows : 1) The yield by varieties through this experiment showed 1.06 times in Seul Oak, 1.94 times in Bokkwang and 1.89 times in Teaback more than Standard Yield. 2) The consumptive use of water including infiltration were 1.068.4mm in Seul Oak, 1,102. 6mm in Bokkwang and 1,195.6mm in Teaback 3) The evapotranspiration by Actual measurement presented 520.lmm in Seul Oak, 540.lmm in Bokkwang and 598.4mm in Teaback 4)The ratio of evapotranspiration and infiltration over Panevaporation showed 1.2 to 1.4. 5) The irrigation water reguirement by water balance were shown to be irrigated more than 584 mm / yr in average during 21 years from '66yr to '86yr for all Varieties and those for loyr frequency 693 mm in Seul Oak, 712 mm in Bokkwang and 728 mm in Teaback respectively. 6) Crop Coefficient (Ke Value) of the tested rice plant during the period were shown as Table 10. 7) Penman Method was the formula the most close to experiment Value among four different methods of Blaney & Griddle Penman, Hargreaves, and Thornthwaite.

• Journal of the Institute of Electronics Engineers of Korea SC
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• v.42 no.2 s.302
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• pp.39-48
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• 2005

This paper proposes a novel approach to recognize nine kinds of motion for a multifunction myoelectric hand, acquiring four channel EMG signals from electrodes placed on the forearm. To analyze EMG with properties of nonstationary signal, time-frequency features are extracted by wavelet packet transform. For dimensionality reduction and nonlinear mapping of the features, we also propose a feature projection composed of PCA and SOFM. The dimensionality reduction by PCA simplifies the structure of the classifier, and reduces processing time for the pattern recognition. The nonlinear mapping by SOFM transforms the PCA-reduced features to a new feature space with high class separability. Finally a multilayer neural network is employed as the pattern classifier. From experimental results, we show that the proposed method enhances the recognition accuracy, and makes it possible to implement a real-time pattern recognition.

• The Research Journal of the Costume Culture
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• v.23 no.1
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• pp.32-44
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• 2015

Increasing of Korean old women's rate is demographic characteristics attributed an aging society, silver generation would lead to silver fashion market with steady competitiveness and interest in fashion. So the study attempts to use foundation material for silver's fashion design by analyzing design characteristics and processing development of design representative women's top. Selecting brand for collecting photo using study represents a mid- and premium-priced with reference Brand Yearbook. After selecting brand on domestic and foreign I have collected picture from Internet shopping mall and web-site of fashion brand, from October 2013 to July 2014, but I selected 840 pictures based on front poses for easy decision. In order to search design characteristics according to sort of silver blouse design on domestic and foreign. I have examined shape, color, pattern, fabric sensation, inside composition line and decoration with reference standard of analysis in preceding research. Data analysis method was conducted on analysis of frequency and cross analysis using SPSS statistical package 21.0. The conclusion of design characteristic according to type of blouse design for silver, H-silhouette in shirt blouse seems to fit in body transformation and expose silhouette with correcting the body flaw. Using soft material in T-shirt blouse they are able to conceal a body defect and express beautiful silhouette. By using detail in pullover shirt blouse and tunic blouse for point of design, it express glamour and luxurious. Most of blouse are printed various pattern, it would looks more gorgeous using pattern.

• The Research Journal of the Costume Culture
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• v.15 no.4
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• pp.661-676
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• 2007

The purpose of this study was to investigate the periodical change of Korean children's clothing from 1960 to 2000. As valuable historical data, 794 children's clothing in wedding pictures in these periods were collected for this study. Research method was content analysis and frequency, cross table analysis, and ${\chi}^2$ test were conducted for data analysis. The results of this study were as follows. The children's clothing in 1960s had very humdrum and limited design and plain pattern. And most of children in this period wore Western clothes of casual style. In 1970s, children's clothing was enriched in terms of design, pattern, color and ornament. However, clothing design for children was not developed yet, so form of children's clothing in this period was showed as duplication of adult clothing design. In 1980s, The children's clothing was developed with enhancement of the level of living. Various style and sophisticated design were appeared and design and size system for children were developed. With increasement of social interest of leisure and sports, casual style was especially popular in this period for both of children and adult in this period. In 1990, rapid decrease of birth rate resulted in parents' excessive interest and investment for their children. In this effects, children's clothing in 1990s had luxury, various, and individual characteristics.

• Journal of Korean Society of Industrial and Systems Engineering
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• v.40 no.4
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• pp.237-245
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• 2017

Our research is aimed at predicting recent trend and leading technology for the future and providing optimal Nano technology trend information by analyzing Nano technology trend. Under recent global market situation, Users' needs and the technology to meet these needs are changing in real time. At this point, Nano technology also needs measures to reduce cost and enhance efficiency in order not to fall behind the times. Therefore, research like trend analysis which uses search data to satisfy both aspects is required. This research consists of four steps. We collect data and select keywords in step 1, detect trends based on frequency and create visualization in step 2, and perform analysis using data mining in step 3. This research can be used to look for changes of trend from three perspectives. This research conducted analysis on changes of trend in terms of major classification, Nano technology of 30's, and key words which consist of relevant Nano technology. Second, it is possible to provide real-time information. Trend analysis using search data can provide information depending on the continuously changing market situation due to the real-time information which search data includes. Third, through comparative analysis it is possible to establish a useful corporate policy and strategy by apprehending the trend of the United States which has relatively advanced Nano technology. Therefore, trend analysis using search data like this research can suggest proper direction of policy which respond to market change in a real time, can be used as reference material, and can help reduce cost.

• Journal of Community Nutrition
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• v.7 no.2
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• pp.71-78
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• 2005

This study was performed to investigate dietary habits and nutrient intakes of college students in Gyeonggi-do area. Survey questionnaire and daily intake using 24-hour recall method were recorded by 351 college students (172 males, 179 females) . Nutrient intakes were calculated using Can-pro 2.0, from which $\%$RDA (Recommended dietary allowances), NAR (Nutrient adequacy ratio), MAR (Mean nutrient adequacy ratio), and ND (Nutrient density) were calculated to evaluate the quality of diets. Subjects answered 9 questions on dietary habits and these answers were calculated as 0, 0.5, and 1 point by frequency. Dietary habit was 39.57 $\pm$ 21.82 in male students and 42.12 $\pm$ 20.78 in female students out of total score of 100, showing higher score in female students. In the survey of dietary habits, the ratio of skipping breakfast 6 - 7 days a week in total subjects was $32.9\%$, showing a rather higher ratio of skipping breakfast, and the interest for balanced diet was as low as $13.2\%$ in total subjects. The importance of meals in total subjects was observed in the order of dinner ($47.6\%$), lunch ($40.2\%$), and breakfast($12.3\%$). In NAR of total subjects, nutrients with a score lower than 0.70 were calcium (0.64 $\pm$ 0.26), vitamin $B_2$ (0.66 $\pm$ 0.25), and vitamin C (0.69 $\pm$ 0.29) in ND of them, calcium (0.85 $\pm$ 0.43), zinc (0.89 $\pm$ 0.18), vitamin $B_2$(0.87 $\pm$ 0.34), and folic acid (0.91 $\pm$ 0.96) were nutrients with lower values. In the evaluation of nutrient intakes by the level of dietary habits, better scores of both NAR and ND were observed as the level of dietary habits was higher. There was a great difference in nutrient intakes in terms of $\%$RDA, suggesting the risk of nutritional imbalance. Based on the above results, it is considered that the improvement in dietary habits will contribute to the improvement of nutrition.

• Journal of the Korean Recycled Construction Resources Institute
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• v.8 no.3
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• pp.263-268
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• 2020

The purpose of this study is to investigate the damping properties of polyurethane composites incorporating waste tire rubber powder and preplaced coarse aggregates. Four types of polyurethane-based composites were manufactured, and longitudinal impact tests were performed. And vibration signals in the time domain and frequency domain were measured and values of damping ratio for each specimen were calculated. Test results showed that the damping ratios of polyurethane composites, in which the amount of polyurethane was reduced by 10.6% and 21.2% through incorporation of rubber particles, were 8.4% and 4.6% lower than that of pure polyurethane. The damping ratio of the polyurethane composite produced in a similar manner to the prepact concrete production method was found to be 22% lower than that of pure polyurethane, however, the amount of polyurethane was reduced by 50% and the stiffness was 25.7 times higher than that of pure polyurethane.