• Journal of Korean Home Economics Education Association
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• v.21 no.3
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• pp.111-122
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• 2009

This study assessed the levels of knowledge and behavior about food safety, the factors influencing them and the causal relationship between them. The data were collected from 297 high school students in Gyeongbuk region by the self-administered questionnaire. The questionnaire was composed of closed-end questions regarding each respondent's characteristics such as sex and grade, recognition on food safety, concern about hazardous elements towards foods and knowledge and behavior about food safety. The results of this study were as follows. Both levels of knowledge and behavior about food safety were not particularly high. The factors affecting the level of knowledge about food safety were mother's age and concern about hazardous elements towards foods. Grade, father's educational level, concern about hazardous elements towards foods, and the level of knowledge about food safety influenced the level of behavior about food safety. The results of the path analysis showed that grade and father's educational level directly affected the level of behavior about food safety. In addition, concern about hazardous elements towards foods had direct and indirect effect on the level of behavior about food safety On the other hand, the level of knowledge about food safety had an direct influence on the level of behavior about food safety.

• Radiation Oncology Journal
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• v.20 no.4
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• pp.381-390
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• 2002

Purpose : To develop a dose calibration program for the IAEA TRS-277 and AAPM TG-21, based on the air kerma calibration factor (or the cavity-gas calibration factor), as well as for the IAEA TRS-398 and the AAPM TG-51, based on the absorbed dose to water calibration factor, so as to avoid the unwanted error associated with these calculation procedures. Materials and Methods : Currently, the most widely used dosimetry Protocols of high energy photon beams are the air kerma calibration factor based on the IAEA TRS-277 and the AAPM TG-21. However, this has somewhat complex formalism and limitations for the improvement of the accuracy due to uncertainties of the physical quantities. Recently, the IAEA and the AAPM published the absorbed dose to water calibration factor based, on the IAEA TRS-398 and the AAPM TG-51. The formalism and physical parameters were strictly applied to these four dose calibration programs. The tables and graphs of physical data and the information for ion chambers were numericalized for their incorporation into a database. These programs were developed user to be friendly, with the Visual $C^{++}$ language for their ease of use in a Windows environment according to the recommendation of each protocols. Results : The dose calibration programs for the high energy photon beams, developed for the four protocols, allow the input of informations about a dosimetry system, the characteristics of the beam quality, the measurement conditions and dosimetry results, to enable the minimization of any inter-user variations and errors, during the calculation procedure. Also, it was possible to compare the absorbed dose to water data of the four different protocols at a single reference points. Conclusion : Since this program expressed information in numerical and data-based forms for the physical parameter tables, graphs and of the ion chambers, the error associated with the procedures and different user could be solved. It was possible to analyze and compare the major difference for each dosimetry protocol, since the program was designed to be user friendly and to accurately calculate the correction factors and absorbed dose. It is expected that accurate dose calculations in high energy photon beams can be made by the users for selecting and performing the appropriate dosimetry protocol.

• Journal of Community Nutrition
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• v.4 no.2
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• pp.71-77
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• 2002

The U.S. government have concerned about food safety over the last two decades. The concept of the continuum, “from farm to table” was created to explore ways to prevent foodborne illnesses in all stages of food systems. On the continuum, consumers were recognized as the last line of defense to prevent foodborne illnesses, and much efforts were made to educate them safe food handling. This research was conducted to investigate infant formula handling and hand-washing behaviors of low-income families, especially parents and guardians of infants. The subject was selected from participants of the Special Supplemental Nutrition Program for Women, Infants, and Children(WIC), a federal program for low-income families in the U.S. Stratified 200 local WIC offices were randomly selected based on the number of WIC participants in each state, and 20 randomly selected WIC participants from each selected office were asked to complete questionnaires. SPSS for Windows was used for statistical analyses including frequency, cross- tabulation, and chi-square analyses. A total of 87 WIC offices returned completed question-naires (N = 1,598), and 492 were parents/guardians of infants. Most respondents were white (51.3%), high school graduates (41.5%) , and participated in WIC>1 yew. Most respondents (80.9%) teamed about food safety from WIC, and only limited number of respondents (10.2%) used the Internet for food safety information. Most respondents stored prepared formula safely (94.6%) and discarded formula left in the bottle after feeding (84.5%) , but fewer used brushes to wash formula bottles (71.3%) and boiled water(15.2%) Chi-square analyses showed respondents in different race/ethnicity had different food handling behaviors. Respondents showed generally good hand-washing behaviors as 94.2% always washing hands after using restroom, 93.2% after touching meat items, and 87.l% before preparing foods. Fewer respondents, however, washed hands after changing baby diapers (77.0%) and touching pets (67.2%). Researchers concluded that WIC education on food safety was effective, as limited food safety education covered during WIC education were followed well (e.g., storing prepared formula and discarding leftover). However, results also indicated that there were many behaviors needed to be reinforced especially to overcome family tradition and culture on food handling behaviors. The WIC may serve as good food safety resources and education agents utilizing mandatory education sessions because the vast amount of food safety information on the Internet was not readily accessible for this low-Income Population.

• Korean Journal of Hospice Care
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• v.8 no.2
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• pp.1-16
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• 2008

Hospice should help a patient maintain spiritual well-being and its attitudes toward death can have great effects on treatment and nursing of patients on terminal patient. The purpose of this study was to examine the differences in spiritual well-being and attitudes toward death due to taking a Hospice Subject in Nursing Students This is a comparative study design in which 31 senior nursing students of taking a hospice care subject and 27 senior nursing students of not taking a hospice care subject in college of nursing K university, that is located B metropolitan city in Korea. The instruments for spiritual well-being measuring tools was Kim's (2006) revision and complement of the translation by Choe (1990) on the basis of the spiritual well-being scale developed by Paloutzian and Ellison (1983). The instruments for attitudes toward death was researches revision and complement of the translation by Kim(1992) on the basis of the attitudes toward death Measuring Tool developed by Thorson and Powell (1988). Data were collected from June 1 through June 30, 2006; the researcher got permission from the subjcts, explained objectives of the research to subjects personally and got their permission, and distributed structured questionnaires to make a response in a self-administered basis. For data analysis, an SPSS WINDOWS 12.0 program was used for frequency, percentage, the mean, standard deviation, the minimum, the maximum, x2-test, ANCOVA, and Pearson's correlation coefficients. The main results of this research are as follows: 1. There were no differecnces the degree of spiritual well-being and the degree of attitudes toward death between nursing students who took a hospice subject and nursing students who did not take a hospice Subject, except several items of attitudes toward death. There was significant positive correlation (r= .508, p= .000) between subjects spiritual well-being and attitudes toward death. That is, the higher spiritual well-being, the more positive attitudes toward death. In conclusion, although there were no differecnces spiritual well-being and attitudes toward death between nursing students who took a hospice care subject and nursing students who did not take a hospice care subject, in nursing students, spiritual well-being was relatively high and their attitudes toward death was relatively positive. To help a nursing students make a positive change in attitudes toward death, a nursing intervention program is necessary to improve spiritual well-being.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.37 no.6
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• pp.445-452
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• 2019

In this study, parallel processing codes of k-means clustering algorithm were developed and implemented in a PC-cluster for unsupervised classification of large satellite images. We implemented intra-node code using multicores of CPU (Central Processing Unit) based on OpenMP (Open Multi-Processing), inter-nodes code using a PC-cluster based on message passing interface, and hybrid code using both. The PC-cluster consists of one master node and eight slave nodes, and each node is equipped with eight multicores. Two operating systems, Microsoft Windows and Canonical Ubuntu, were installed in the PC-cluster in turn and tested to compare parallel processing performance. Two multispectral satellite images were tested, which are a medium-capacity LANDSAT 8 OLI (Operational Land Imager) image and a high-capacity Sentinel 2A image. To evaluate the performance of parallel processing, speedup and efficiency were measured. Overall, the speedup was over N / 2 and the efficiency was over 0.5. From the comparison of the two operating systems, the Ubuntu system showed two to three times faster performance. To confirm that the results of the sequential and parallel processing coincide with the other, the center value of each band and the number of classified pixels were compared, and result images were examined by pixel to pixel comparison. It was found that care should be taken to avoid false sharing of OpenMP in intra-node implementation. To process large satellite images in a PC-cluster, code and hardware should be designed to reduce performance degradation caused by file I / O. Also, it was found that performance can differ depending on the operating system installed in a PC-cluster.

• Journal of the Korean Home Economics Association
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• v.41 no.10 s.188
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• pp.57-73
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• 2003

The purpose of this study is to investigate the relationship between home economics teachers' characteristics and middle school students' affective morality through Home Economics Instruction. The affective morality of middle school students after taking home economics classes were assessed and investigated as to what sorts of affective morality there were and to find out what level they were. further, what factors affected the affective morality of middle school students considering the variable factors of home economics teachers. 800 first year male and female students of 17 middle schools located in Cheonju and Cheongwon were selected through non-random or accessible sampling. The frequency, precent, mean and standard deviation, correlation, t-test, and one-way ANOVA, and multiple regression of these data were obtained by using the SPSS 10.0 for Windows Program. The result of this study were as follows: First, basic etiquette was the most important rated the highest among the affective morality, nature preservation turned out the lowest in each questionnaire. Learned in home economics, it was considered the highest goal; Second, in terms of character and affective morality of middle school students, male students ranked higher than female students and the students with a better academic performance record, and those who engaged in club activities showed better results in affective morality as did students with religious beliefs and students with better educated parents and also students from homes with better financial situations. Third, in terms of students' perception of home economics teachers with a good nature turned out the highest, teaching ability and career awareness and also reflected at the same level. Fourth, students' perception of home economics teachers' characteristics and their affective morality are honed out correlated with each other. The correlation of home economics teachers' career awareness and compassion${\cdot}$devotion${\cdot}$service morality proved to be the highest. Fifth, the affective morality of those students who do community service, club activities and those who are interested in home economics and who respect home economics teachers tended to be high.

• Journal of the Korean Electrochemical Society
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• v.3 no.1
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• pp.19-24
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• 2000

It is increasingly necessary to use poly-Si n's as high resolution and integration of Tn for LCD. Excimer Laser Crystallization (ELC) of a-Si is mainly used as a low temperature process. But the ELC method for the fabrication of poly-Si has the eruption problems associated with hydrogen in the a-Si film. So we need a dehydro-genation process additionally. Hydrogen in a-Si film can degrade the quality of poly-Si film and electrical properties of device due to the hydrogen eruption and voids which occur during the excimer laser annealing. In this study, we propose mesh-type PECVD as the a-Si film deposition method for achieving the low concentration hydrogen. Mesh-type PECVD was found to reduce the hydrogen content substantially. We could obtain a as-deposited a-Si film with hydrogen contents less than $1\%$ at $300^{\circ}C$. We also investigated the behavior by XeCl excimer laser annealing of a-Si fabricated by mesh-type PECVB. As a result, we were able to confirm the broad process window in contrast to the narrow process range typically obtained in ELC. Hydrogen eruption was not observed in poly-Si films after ELC These results suggests that mesh-type PECVD is a viable method to achieve the low hydrogen content a-Si and improve the process windows for ELC.

• Journal of the Institute of Electronics Engineers of Korea SC
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• v.44 no.6
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• pp.57-65
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• 2007

This paper presents the design of single phase PFC(Power Factor Correction) using a DSP(TMS320F2812). In order to realize the proposed boost PFC converter in average current mode control, the DSP requires the A/D sampling values for a line input voltage, a inductor current, and the output voltage of the converter. Because of a FET switching noise, these sampling values contain a high frequency noise and switching ripple. The solution of A/D sampling keeps away from the switching point. Because the PWM duty is changed from 5% to 95%, we can#t decide a fixed sampling time. In this paper, the three A/D converters of the DSP are started using the prediction algorithm for the FET ON/OFF time at every sampling cycle(40 KHz). Implemented A/D sampling algorithm with only one timer of the DSP is very simple and gives the autostart of these A/D converters. From the experimental result, it was shown that the power factor was about 0.99 at wide input voltage, and the output ripple voltage was smaller than 5 Vpp at 80 Vdc output. Finally the parameters and gains of PI controllers are controlled by serial communication with Windows Xp based PC. Also it was shown that the implemented PFC converter can achieve the feasibility and the usefulness.

• Archives of design research
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• v.13 no.4
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• pp.233-242
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• 2000

The traditional image of hydraulic excavator started to change in two ways since 1990. First, post-heavy equipment's visual image was new waves to traditional image of heavy, strong, and wild. They are the negative aspect that excavators have. Another movement of getting rid of its negative image can be found in late-heavy equipment, which was intended to adapt traditional and positive, but off negative images. In 1990s, the design trend is moving from warm/hard to warm/soft, and KOBELCO can be exceptional example that went even further, gone up to cool-soft image. KOBELCO specially aimed 'post- excavator image' strategy, which has been successful. Image of cabin as a human space changed little bit further than outside image. Each company tried to differentiate the design of cabin focusing on its safety. Following paragraphs show specific trend of image change in form, colour, texture, and the composition. Major visual image change in form tries to follow the image of cars and home appliances which are showing the movement from tough and hard image to soft one. Structural change on local image shows the movement from angular edge to edgeless and the movement of cabin's pillar C placed to back of the equipment with gentle inclination. All of these movements are the result of effort to improve traditional excavator's negative image, that top structure is assembled separately, to positive ones. Today's tendency about its color becomes important to apply two different colour styles. Each style has brightness and tone comparison. As an enormous power convey system, it was in common that its brightness comparison was useful because of the alarm of its damage possibility. However, as its colour control and its design have been emphasized gradually, the tone comparison takes a part in an important role, too. As an example, there is an occasion that these comparisons are compromised simultaneously. In the respect of its image creation, its texture treatments make the tendency of being the same as passenger cars. It is caused from its development of the manufacture techniques of from the fabrication method in small business to the press method in big firm. Further, it is also because of its improvement of painting & coating skills. It may prohibit the reflection effect from solar rays. In the point of view of its visual images, it is recognized the prominent tendency that its composition has been gradually decreased. Lots of windows and the frames tends dark-colour as a whole. It is more preferred to have one colour image, but except KOBELCO and HITACHI. As well, there is another high-tendency to improve its standard treatments, especially for its corner and texture treatments.

• Journal of Korea Multimedia Society
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• v.2 no.3
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• pp.277-288
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• 1999

A distributed multimedia school system is developed for the multimedia classroom at high school and university. The system is designed and implemented for students to improve the learning efficiency through the personalized multimedia contents and pace of learning. The previously developed multimedia information retrieval systems have some limitations on being applied to the multimedia classroom: expensive cost per stream or poor retrieval quality inappropriate for education, unscalability of system and service, unfamiliar proprietary client environment, and difficulty for teachers to use the authoring tools and manage the authored teaching materials. The system we developed overcomes the above problems. It is so scalable as to be applicable not only to a segmented classroom but also to the world wide Internet. The stream server is one of the components of the system: stream servers clients, a service gateway system, and a authoring management system. This paper describes the design and implementation of the stream server. A single stream server can simultaneously playback the multimedia streams as many as clients at one classroom. This is achieved only by the software engine without any changes of the hardware architecture. The systematic coupling with other components gives the scalability of the system and the flexibility of services.