• Journal of IKEEE
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• v.22 no.3
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• pp.522-531
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• 2018

A public-key cryptography processor EC-RSA was designed, which integrates a 224-bit prime field elliptic curve cryptography (ECC) defined in the FIPS 186-2 as well as RSA with 2048-bit key length into a single hardware structure. A finite field arithmetic core used in both scalar multiplication for ECC and exponentiation for RSA was designed with 32-bit data-path. A lightweight implementation was achieved by an efficient hardware sharing of the finite field arithmetic core and internal memory for ECC and RSA operations. The EC-RSA processor was verified by FPGA implementation. It occupied 11,779 gate equivalents (GEs) and 14 kbit RAM synthesized with a 180-nm CMOS cell library and the estimated maximum clock frequency was 133 MHz. It takes 867,746 clock cycles for ECC scalar multiplication resulting in the estimated throughput of 34.3 kbps, and takes 26,149,013 clock cycles for RSA decryption resulting in the estimated throughput of 10.4 kbps.

• Korean Journal of Health Education and Promotion
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• v.28 no.5
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• pp.131-143
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• 2011

Objectives: This study is to develop a web-based prevention program of alcohol-related problem among university students and to examine its efficacy in changing drinking behaviors and reducing harms associated with alcohol use. Methods: An hour-length program was developed containing news paper articles, pictures, stories and questionnaires in a multimedia format such as flash, animation, and text. Survey data were analyzed to examine program efficacy from a convenient sample of 1,080 freshmen enrolled in a participating university. Results: Participation in the program has resulted in statistically significant changes in drinking behavior between pretest and follow-up, including reduction of frequency of drinking, heavy drinking, and intoxication, typical amount of drinking per occasion, and subjective norm of heavy drinking. Repeated ANOVA revealed significant increases in knowledge on alcohol related facts, including recommended drinking unit by WHO with substantial level of effect size and in making negative alcohol expectancy with very low effect size. Further studies are guaranteed with randomized controlled trial for the program effectiveness. Conclusions: A web-based prevention program of alcohol-related problems in this study was efficacious in changing drinking behavior, knowledge on alcohol-related fact, alcohol expectancy and subjective drinking norm.

• Journal of the Korean Geographical Society
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• v.39 no.5 s.104
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• pp.711-721
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• 2004

The aim of this study is to clarify whether frequency and/or severity of extreme climate events have changed significantly in Korea during recent years. Using the best available daily data, spatial and temporal aspects of ten climate change indicators are investigated on an annual and seasonal basis for the periods of 1954-1999. A systematic increase in the $90^{th}$ percentile of daily minimum temperatures at most of the analyzed areas has been observed. This increase is accompanied by a similar reduction in the number of frost days and a significant lengthening of the thermal growing season. Although the intra-annual extreme temperature range is based on only two observations, it provides a very robust and significant measure of declining extreme temperature variability. The five precipitation-related indicators show no distinct changing patterns for spatial and temporal distribution except for the regional series of maximum consecutive dry days. Interestingly, the regional series of consecutive dry days have increased significantly while the daily rainfall intensity index and the fraction of annual total precipitation due to events exceeding the $95^{th}$ percentile for 1901-1990 normals have insignificantly increased.

• Asian Pacific Journal of Cancer Prevention
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• v.16 no.13
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• pp.5219-5223
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• 2015

Helicobacter pylori (H. pylori) infection as a serious problem in both adults and children can induce chronic gastritis, peptic ulcer disease (PUD), and possibly gastric cancer. The aim of the current study was to survey antibiotic resistance and also to determine influence of PPAR$\gamma$ polymorphism in patients with H. pylori infection. During an 11-month-period, 98 H. pylori isolates were collected from 104 biopsy specimens. In vitro susceptibility of H. pylori isolates to 4 antimicrobial agents metronidazole, clarithromycin, amoxicillin and tetracycline were assessed by quantitative method according to European Committee on Antimicrobial Susceptibility Testing (EUCAST) guideline. PPAR$\gamma$ polymorphism was determined using polymerase chain reaction-restriction fragment length polymorphism assay. The frequency of H. pylori infection in our study was 94.2%. In vitro susceptibility data showed that highest level of resistance was related to metronidazole (66.3%), and the majority of H. pylori isolates were highly susceptible to amoxicillin and tetracycline (94.9% and 96.9%, respectively). Genotypic frequencies were 25.5% for CC (Pro12Pro), 40.8% for GC (Pro12Ala) and 33.7% for GG (Ala12Ala). In our study, CG genotype had highest distributions among infected patients with H. pylori. The study suggests that the PPAR-$\gamma$ Pro12Ala polymorphism could be evaluated as a potential genetic marker for susceptibility to gastric cancer in the presence of H. pylori infection.

• Fashion & Textile Research Journal
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• v.17 no.1
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• pp.1-10
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• 2015

The concern for living a healthier and more active life has increased and the target market for the leisure-sportswear will broaden. This study suggests ideas and directions to develop horse-riding pants that consider fit satisfaction, demand performance and design requirements. A total of 203 riders were surveyed in Busan, Jeju, and Gwacheon horse racing tracks from November to December 2011 and from September to October 2012. Frequency analysis, ANOVA, t-test, and ${\chi}^2$-test were performed for the statistical analysis of the data using SPSS Win 21.0 program. The results of this study are as follows. The satisfaction of riding pants showed differences according to gender, riding career, BMI, age, and riding level. Females showed lower satisfaction of pant length than males. Riders with 1-4 years riding career showed more satisfaction of the front waist circumference. The group between 10 and 20 years more strongly preferred a rubber band waist than the group over 30 years. Those underweight preferred no pocket on the back. The intermediate-high riding level showed more fit satisfaction than those at the high level. Beginners put more importance on hip cushion, while riders over an intermediate level put more importance to sewing durability. Basic pants with beige and/or black full patch attached to the velcro hem were preferred by most riders. In conclusion, it is confirmed that design strategies in segmented riding pants market are necessary.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.5 no.3
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• pp.31-38
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• 1985

The governing differential equations and the boundary conditions for the free vibration of fixed-ended uniform parabolic arch are derived on the basis of the equilibrium equations and the D'Alembert principle. The effect of rotary inertia as well as extensional and flexural deformations is considered in the governing differential equations. A trial elgenvalue method is used for determining the natural frequencies. The Runge-Kutta method is used in this method to perform the integration of the differential equations. The detailed studies are made of the lowest three vibration frequencies for the span length equal to 10m. The effect of the rotary inertia is analyzed and it's numerical data are presented in table. And as the numerical results the frequency versus the rise of arch and the radius of gyration are presented in figures.

• Korean Journal of Applied Biomechanics
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• v.17 no.4
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• pp.1-8
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• 2007

The purpose of this study was to investigate the difference in the stride-to-stride variability between two treadmill conditions; traditional treadmill and special treadmill whose speed can be adjusted automatically by subject's walking speed. Eight male subjects (25.1 years, 172.7 cm, 66.6 kg) were participated in treadmill walking experiment. First, preferred walking speed (PWS) of each subject was determined. Second, each subject performed walking experiment with fixed PWS condition and with free PWS condition for 10 minutes. 3D motion capture system (Motion analysis Corp., USA) with 6 cameras was used to collect motion data with sampling frequency of 120Hz. Temporal and spatial variables for stride-to-stride variability were calculated. Coefficient of variance (CV) which quantifies the amount of variability and Detrended Fluctuation Analysis (DFA) which explains the structure (self-similarity) of the variability were used for analysis. Results showed that the amount of variability during free PWS condition was greater than that of fixed PWS condition. DFA results showed that there was a statistical difference between two treadmill conditions for the variables of step length, stance time, and double support time. From these results, it is possible that traditional treadmill study might give incorrect conclusion about gait variability study. Further study is necessary to clarify these matters by considering the number of subjects, experimental time, and gait variables for the study of stride-to-stride variability.

• Journal of the Korean Society of Clothing and Textiles
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• v.23 no.3
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• pp.447-458
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• 1999

The purpose of this study was to analyze jeans market faced with economic difficulties to provide jean's maker with a large representative data base for jeans marketing strategy. This study surveyed jeans market and analyzed brand awareness. brand image and consumer's seeking image for 700 young adults. The 700 questionnaires were distributed at the five locations(Opkujung Shinchon Munjungdong, Shinrimdong '||'&'||' Suwon) and 656 reliable ones were used for statistical analysis. A. SAS statistical package including frequency table factor analysis. analysis of variance. and Duncan's multiple range test was used. The results are as follows : 1. Brand awareness involves "brand recall" based on asking a person to name recalled first and "brand rcognition" based on asking to identify brand name from 30 given brands. The result indicated that "Levis" was dominant for brand recall and Guess was dominant for brand recognition. 2. Regarding the brand image the result showed that "Vov" was best represented for sophisticated '||'&'||' trendy brand images "Storm" for characteristics brand image "Jambangee" for reasonable price '||'&'||' comfortable brand images and "Levis" for classic '||'&'||' design/color brand images. 3. As a result of factor analysis on consumer's seeking image six factors(characteristic/gay, intelligent/sexy, feminine/sophisticated , active/functional, cute/young, simple/comfortable) were found. Several factors had a relationship with demographic variables and preferred design. 4 Many young adults favored following design details ; low waist relaxed thigh with straight leg and long length up to the end of shoes. Also they preferred basic pocket to cargo pocket and simple logo accessories to metal ones.simple logo accessories to metal ones.

• Korea Journal of Hospital Management
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• v.11 no.1
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• pp.91-109
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• 2006

This study was conducted to find out factors affecting patient safety management activities at nursing devisions of two university hospitals. The indicators of patient safety activities used in the study were selected from Hospital Survey on Patient Safety Culture which was developed by The Agency for Healthcare Research and Quality in the United States. Data were collected from 372 nurses working at inpatient wards at two university hospitals located in Seoul and Won-Ju cities through the self-administered questionnaires, and analyzed using frequency analysis, t-test, correlation, and regression analysis. The result of this study were as follows. First, The mean of patient safety management activities was 3.41 which was a little bit higher than the average level. The mean of communication within the ward was the highest, whereas that of patient safety management culture was the lowest. Second, there were significant differences in the perception of nurses on patient safety management activities in terms of the educational background, length of employment, and work hours per week. Third, three variables of communication within the unit, attitude of top management, and attitude of nurses have significant positive effects on patient safety management activities. Fourth, 37.4% of the variation in the patient safety management activities was explained by the study variables. In conclusion, hospital administration and nursing managers should make an effort to learn the knowledge of patient safety program, show their deep interest on the patient safety to the employees and motivate them to communicate effectively each other within the work unit to develop a good patient safety culture and system.

• Journal of the Korean Home Economics Association
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• v.39 no.8
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• pp.107-120
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• 2001

The purpose of this study is to characterize the preference for fashion design according to fashion value of Net generation's. This study has 824 samples of individuals aged from 13 to 24. These sampling data are analyzed by frequency analysis, cross-tabs analysis, T-test, LSD-test, MANOVA and ANOVA utilizing SPSS WIN package. The results of this study are as follows; Net generation's is economic value higher than other fashion value and prefer for ring cuffs, mandarin sleeves, shirt collar, round neckline, tailored pants, blue color, check pattern according to economic value. It is proved that in case of shirt, people prefer ring cuffs, raglan sleeves, shirt collar, for jacket, prefer coat cuffs, mandarin sleeves, tailored collar, for jumper, they prefer single cuffs, set in sleeves, soutien collar and for T-shirt, prefer round neckline. For the design and length of pants, people prefer long tailored pants, color of blue and check designed one. It is proved that women haute a higher degree of preference for sleeve-design, neckline-design and color than men do.1318 teenagers have a higher preference for sleeve-design, neckline-design and color than semi-adult. Above university educational-course Net generation has a higher degree of preference for sleeve-design, neckline-design and color than high school educational-course Net generation does. A class of average monthly income of 2-3 million won has a higher degree of preference for neckline-design and color than other lasses do. And there is no difference at the preference for the fashion design when considered classes of average monthly expenditure on purchasing clothes.