• Proceedings of the IEEK Conference
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• 1999.11a
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• pp.220-223
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• 1999

Conventional double DES has been not only shown to have a vulnerable drawback to attack method called 'Meet-in-the-Middle', but also to be hard to use that it is because software implementation has a number of problem in real time processing. This paper describes the design and implementation of modified Isolated double DES algorithm using VHDL for resolving the above problems. In this approach, we also discuss an efficient method for increasing cipher strength through expansion of key length.

• Journal of Nutrition and Health
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• v.30 no.3
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• pp.277-285
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• 1997

The purpose of this study was to investigate the relationship among nutrient intake, life style, and serum lipids level in 108 healthy middle-aged men in Taegu. A convenient method was to assess nutritional intake. Anthropometric measuement of body weight and hight were measured and average energy expenditure was calculated. The mean body mass index(BMI) was 22.8$\pm$2.4 and it was in the middle of the mean BMI of Korean men. Obesity rate of study subject were 13.2%. Daily energy intake was not sufficient as 88.4% of recommended dietary allowances and the energy percentage of carboydrate, fat protein was 65 : 21 : 14. Mean intake of vitamin A, B1, C and Ca were lower than RDA. There was a highly significant negative correlation between the systolic blood pressure and calcium intake(r=-0.28, p<0.05). Smokers showed significantly higher blood glucose than non-smokers. Skipping meals and uneven diurnal distribution(no breakfast and large evening meals) are associated with high triglyceride level in this population. There was a highly significant correlation between body weight and plasma lipids. Energy expenditure was negatively correlated with plasma triglyceride level. Especially, atherogenic index was significantly lower in job-time physically active worker than that in sedentary worker. Above data provides valuable imformation to the community for program planning as well as to health providers who work individual male adults to meet their nutrition needs and to control blood lipids.

• Proceedings of the IEEK Conference
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• 2000.07b
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• pp.743-746
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• 2000

In this paper we propose a new network called Dynamic network for symmetric block ciphers. Dynamic cipher has the property that the key-size, the number of round, and the plaintext-size are scalable simultaneously We present the method for designing secure Dynamic cipher against meet-in-the-middle attack and linear cryptanalysis. Also, we show that the differential cryptanalysis to Dynamic cipher is hard.

• International Journal of High-Rise Buildings
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• v.10 no.3
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• pp.173-178
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• 2021

In this paper we introduce Shinagawa HEART, located in Shinagawa district, Tokyo. It is a mixed-use building with residences on the upper floors, offices on the lower floors, and commercial uses on the first and second floors, and is intended to meet the various needs of a building on the border between residential and commercial areas. The upper floors of the building are made of reinforced concrete, while the middle and lower floors are made of steel with CFT columns. First, an overview of the structural plan of the building is presented. Next, the adoption of the middle layer seismic isolation and the switch between the lower steel structure and the upper reinforced concrete structure, which are the features of this building, are explained. Finally, the construction method adopted to achieve the design performance is explained.

• The Journal of Korean Society for School & Community Health Education
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• v.14 no.2
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• pp.29-45
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• 2013

Objectives: The purpose of this study was to identify relationships between experiential activity, ego-resilience, sense of community, and school life adjustment of middle school students and to provide the basic data that can contribute to the activation of experiential activities. Methods: 2,351 middle school students of panel survey conducted by National Youth Policy Institute were used in the final analysis. The structural equation model(SEM) was carried out to analyze structural relationships between experiential activity and ego-resilience, sense of community, and school life adjustment of the youth. IBM SPSS Statistics 20.0 and IBM SPSS AMOS 20.0. were used for the analysis of all data. Results: Experiential activities had a statistically significant positive effect on ego-resilience(p<0.001), school life adjustment(p<0.05), and the sense of community (p<0.001). Especially experiential activities acted on ego-resiliency, a sense of community, school life adjustment as an important parameter. Sense of community also showed to be an important mediating role between ego-resiliency and school life adjustment. Conclusions: In order to maximize the effectiveness of experiential activities, it is necessary to build the community networking enough to take full advantage of community resources and develop various experiential activities to meet the needs of youth and social change.

• The Journal of Sustainable Design and Educational Environment Research
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• v.18 no.3
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• pp.28-38
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• 2019

For students and staff members who spend long periods of time in school, schools must meet a variety of needs such as learning, rest, experience, exchange, play, culture, meeting, and meals. The purpose of this study is to provide basic data aim at improving the school environment by investigating and analyzing the characteristics of middle school students'. For this purpose, the theoretical data collection : case studies and questionnaires, were conducted to analyze the correlation between student's activities and the space utilization of the school. First of all, a questionnaire survey was conducted on 301 middle school students in Ulsan. The t-test and ANOVA analysis were conducted on the questionnaire results to examine whether there was any difference in the perception of school space. The analysis showed significant correlation between interaction with school space according to the characteristics of students' activities. However, there are problems such as the use of space for various.

• Fashion & Textile Research Journal
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• v.10 no.3
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• pp.335-341
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• 2008

This study aims to present the basic information on ready-made clothes production for middle-aged women by examining the clothing-related problems due to the body-shape changes of middle-aged women, and accordingly analyzing the satisfaction level with the purchasing and size of ready-made clothes among the 40-50's women. For this study, a survey was conducted to find out the satisfaction level with the purchasing and size of ready-made clothes. Among the total of 450 copies of questionnaires, 443 were collected, 400 of which were used in the analysis leaving out the rest imperfect ones. SPSS 11.0 Program was used in data analysis to get the frequency and percentage of each item. As for the preferred styles according to the age, respondents aged 45-49 preferred sweaters and trousers most, while most of middle-aged women preferred blouses and trousers most. As for the preferred styles according to occupations and body figures, most of middle-aged women preferred blouses and trousers most. The findings of this study examining the actual conditions of ready-made clothes purchase and wearing, and size satisfaction among the 40-50's women, who will be at the center of the aging populations in the Super-aged society highlight the need to correct the problems of adherence only to the prices, measures, and aesthetic aspects of fashion trends, to meet the requirements and preferences of ready-made clothes for aging women, and fulfill satisfactory functions according to the body figures in the upcoming Super-aged society.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.13 no.9
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• pp.4727-4741
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• 2019

The lightweight block cipher Piccolo adopts Generalized Feistel Network structure with 64 bits of block size. Its key supports 80 bits or 128 bits, expressed by Piccolo-80 or Piccolo-128, respectively. In this paper, we exploit the security of reduced version of Piccolo from the first round with the pre-whitening layer, which shows the vulnerability of original Piccolo. As a matter of fact, we first study some linear relations among the round subkeys and the properties of linear layer. Based on them, we evaluate the security of Piccolo-80/128 against the meet-in-the-middle attack. Finally, we attack 13 rounds of Piccolo-80 by applying a 5-round distinguisher, which requires $2^{44}$ chosen plaintexts, $2^{67.39}$ encryptions and $2^{64.91}$ blocks, respectively. Moreover, we also attack 17 rounds of Piccolo-128 by using a 7-round distinguisher, which requires $2^{44}$ chosen plaintexts, $2^{126}$ encryptions and $2^{125.49}$ blocks, respectively. Compared with the previous cryptanalytic results, our results are the currently best ones if considering Piccolo from the first round with the pre-whitening layer.

• The Korean Journal of Elementary Counseling
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• v.9 no.2
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• pp.195-215
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• 2010

The purpose of this study is to have a preliminary study in order to develop a test which can comprehensively measure anxiety of elementary schoolchildren in middle grade. Following things are conducted to meet this task; first, to look into compositions of the anxiety of elementary schoolchildren in middle grade, to prepare proper questions to measure it and to develop a test; second, to look into whether such questions are fully understood by schoolchildren; third, to look into whether reliability and adequacy thereof are proper or not. Conclusion of the study is as follows; anxiety test of elementary schoolchildren in middle grade showed all the things related to general anxiety, social anxiety, study anxiety, examination anxiety, announcement anxiety. However, there were differences as per subordinate factor and detailed area. And reliability and adequacy of anxiety test for elementary schoolchildren in middle grade were appropriate. and such data could be valuably used for preparing anxiety test. To summarize the study result above, the test developed in this study supplements weak point of existing test instrument and reveals anxiety experienced by elementary schoolchildren in middle grade, and harmoniously composes all the kinds. It is meaningful that the test lowered applicable object to schoolchildren in middle grade who are in anxiety formation stage and also feel anxiety most strongly. In addition, it may be used usefully for living guidance and consultation to efficiently cope with anxiety by measuring base line regarding anxiety of individual schoolchildren in middle grade.

• Journal of the Korean Society of School Health
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• v.18 no.1
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• pp.1-14
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• 2005

Purpose: The purpose of this study was to identify the needs of health education in students, their parents and teachers in the elementary, middle and high schools and the current situation of health education class. Method: The subjects of this study were a total of 9450 persons including students, their parents and teachers from 279 schools throughout the country. They were selected through convenient sampling. Data were analyzed through $\chi^2$-test and ANOVA. Result: Students, their parents and teachers replied that 18 dimensions of health education class (DHEC) are necessary. The four DHEC - healthier life style, sex education, mental health and safety education - showed high educational needs in students, their parents, and teachers. High school students had higher educational need of 'symptom management for daily living' than elementary and middle school students. Students, their parents and teachers in elementary school had higher educational needs of 17 DHEC than those in middle and high school. The percentages of schools with health education class taught by health teachers were 99.2%, 75.5% and 66.0% respectively in elementary, middle and high schools. Health education was given mainly using physical education classes at elementary schools, and creative class hours at middle and high schools. In general, health education took 1-3 hours per week at elementary schools, and less than an hour at middle and high schools. Conclusion: Therefore, based on the results, systematic health education class should begin from elementary school to meet the need of health education in students, their parents and teachers, and further study should be made on the number of hours required and the amount of contents of 18 DHEC.