• Journal of KIISE:Computing Practices and Letters
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• v.15 no.6
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• pp.425-429
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• 2009

Recently, Chen et al.'s proposed mutual authentication scheme based on the quadratic resiidue, finding the squaring root problem, for avoiding exhaustive search on the server. But, if a malicious reader sends same random value, the tag is traced by an adversary. Moreover, there is realization problem because of its limited ability to compute squaring and hash function. In this paper, we analyze Chen et al.'s scheme and its weakness. Furthermore we present an improved mutual authentication scheme based on the quadratic residue which solves the tracing problem by generating random value on the tag and uses only squaring. We also make the scheme satisfy to forward secrecy without updating and synchronizing and avoid exhaustive search.

• Science of Emotion and Sensibility
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• v.21 no.1
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• pp.91-98
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• 2018

The purpose of this study is to reveal concrete evidence on how aesthetic preference is applied in product design by countries. Since the 19th century, the proportion has been examined various times, and the conclusions consistently showed the strong preference for the golden ratio (1:1.618). However, previous studies are mainly focused on western products that were designed by western designers, so when the same experiment conducted for the first time in Asia with the question of 'Is the Asian subjects also likes the golden ratio?', the result clearly revealed that Korean subjects have a significant preference for the root ratio (1:1.414) and perfect square (1:1). It demonstrates that proportion preference might be different by countries, and it also influences on everyday products. Moreover, there is not enough evidence of Asian product proportions. For this reason, this study will strive to expand the knowledge on Asian aesthetic preference by focusing on Japanese automobiles that were designed and produced in Japan. 55 iconic Japanese automobiles were analyzed for proportion and compared with 50 iconic German automobiles. The result shows that Japanese automobiles have a shorter length of 7:10 (1:1.414) ratio than German automobiles with 13:23 (1:1.769) ratio. This result proves that there is the difference in preference for the proportion of Japan and Germany, and it has already influenced on automobile proportions. This result has a strong value that finding the most appropriate proportion of automotive design is a major issue in new product development, so this can be adapted to various fields of the design process where strong cultural value exists.

• Journal of the Korean Society of Costume
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• v.54 no.8
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• pp.129-146
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• 2004

The Purpose of this study is to search the characteristics of aesthetic sense from the spiritual root of anti-decoration culture in contemporary Japanese fashion and find the aesthetic meanings inside contemporary Japanese fashion. This study considered contemporary Japanese fashion design from 1970 to 2000 to figure out the anti-decoration culture in contemporary Japanese fashion. The contents of this study are 1. surveying the historical change about the aesthetic sense of Japanese anti-decoration culture. 2. deducing the distinctive aesthetic ideology from the anti-decoration culture 3. finding aesthetically the inside meaning of anti-decoration culture in contemporary Japanese fashion. The conclusion on this study is as the followings. Anti-decoration culture has three aesthetic ideology. First, faintful aesthetics implies the aesthetic ideologies of Wabi, Sabi from Heian period and it appears the aesthetic sense to be natural beauty. simplicity, minimalism and temperance. Second, ambivalence aesthetics is based on nothingness and has the characteristic of multivocal and variableness without biased view. Third. playful aesthetics has the meaning of humorous. witty and mischievous which is the basic factor of Japanese formative arts. The aesthetic range of this study are the beauty of simplicity. poverty, incompletion, vagueness and humor. First, beauty of simplicity is composed of minimal lines and area through strict temperance and elimination. Second, beauty of poverty came from the aesthetic concept of Wabi which means honorable poverty and plainness. Third, beauty of incompletion means emptiness which is within the range of possibility. Forth, beauty of vagueness could be explained as incorporeal, colorlessness and voiceless. Fifth, Okashi which was the middle ages in Japan, shows the vein of humor in anti-decoration culture. As a result, anti-decoration culture does not mean the opposite of decoration culture, but accomplishes extreme artificial beauty by strict temperance and elimination. Also it is concerned as intentional poverty of decorative effect.

• Journal of the Ergonomics Society of Korea
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• v.32 no.6
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• pp.535-540
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• 2013

Objective: The aim of this study is to evaluate the effectiveness and efficiency of causal links between various error causes in human error analysis. Background: As finding root causes of human error in safety-critical systems is often a cognitively demanding and time-consuming task, it is particularly necessary to develop a method for improving both the quality and efficiency of the task. Although a few methods such as CREAM have suggested causal linking between error causes as a means to enhance the quality and efficiency of human error analysis, no published research to date has evaluated the performance of the causal links. Method: The performance of the CREAM links between error causes were evaluated with 80 railway accident investigation reports from the UK. From each report, errorneous actions of operators were derived, and for each error, candidate causes were found by following the predefined links. Two measures, coverage and selectivity, were used to evaluate the effectiveness and efficiency of the links, respectively. Results: On average, 96% of error causes actually included in the accident reports were found by following the causal links, and among the total of 121 possible error causes, the number of error causes to be examined further was reduced to one-tenth on average. As an additional result of this work, frequent error causes and frequently used links are provided. Conclusion: This result implies that the predefined causal links between error causes can significantly reduce the time and effort required to find the multiple levels of error causes and their causal relations without losing the quality of the results. Application: The CREAM links can be applied to human error analysis in any industry with minor modifications.

• Transactions of the Korean Society of Mechanical Engineers B
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• v.34 no.10
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• pp.947-955
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• 2010

Most oil and gas reservoirs, which have some light hydrocarbon components, show sensitive phase behavior in response to changes in the composition of the internal fluid. When evaluating and developing plans for oil and gas fields, flash calculation, PVT analysis, and saturation-property calculation are necessary for analyzing reservoir characteristics and pipeline flows. In general, the determination of saturation properties such as dew point and bubble point is considered a difficult task because of the poor convergence of the calculation methods. In this study, several new initial-value-guessing methods and root-finding methods are proposed; parametric analysis were carried out to verify the improvement in convergence. Finally, these new ideas and methods were successfully applied to the new GUI based multi-phase behavior simulator.

• Journal of Periodontal and Implant Science
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• v.27 no.3
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• pp.597-602
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• 1997

Glanzmann's thrombasthenia is a Qualitative platelet disorder characterized by a deficiency in the platelet membrane glycoproteins IIb/IIIa. It belongs to a group of hereditary platelet disorders typified by normal platelet numbers and a prolonged bleeding time. The severity of bleeding does not correlate with the severity of the platelet glycoprotein IIb/IIIa a abnormality. The present case report describes the periodontal treatment of a patient with Glanzmann's thrombasthenia. A 30-year-old female with a history of Glanzmann's thrombasthenia was referred for gingival bleeding on tooth brushing and discomforts in #38 area. The periodontal finding revealed a diagnosis of localized slight adult periodontitis. Root planing and extraction of #38 was performed under 12 pack of platelets transfusion and digital compression was done for hemostasis. The gingival bleeding ceased within a day in maxilla and 2 days later in mandible. 42 pack of platelets was administered for 3 days of post-treatment and for iron-deficiency anemia 3 pack of RBCs was transfused 2 days later. 1 week later the inflammation in gingiva disappeared and gingival stippling appeared. The clinical result we got was good and in such a medically compromised patient it is an ability to maintain a proper oral hygiene that is essential both for oral and systemic health.

• The Journal of Korean Medicine Ophthalmology and Otolaryngology and Dermatology
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• v.13 no.1
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• pp.157-184
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• 2000

Bromidrosis is a disease which is also called huchou[호격] in the oriental medicine. This disease produces an odor and a small amount of sweat from the axillary area. Prognosis of the disease could possibly get better with age. This can be explained by the fact that its symptoms begin usually when a person reaches puberty and as the person gets old, the symptoms reduce or disappear even when specific treatments are not applied. Although the disease is not lethal, many patients have difficulties in leading a normal and comfortable life, physically and psychologically with this in mind and some osbservations gained from the literature studies on the causes,symptoms, and treatments, I embarked on a study aimed at finding out the therapies. My study on the literature has produced the following results ; 1. In the oriental medicine, hu-chou[호격] means the characteric smell or odor produced from the fox. 2. The literature studies point out two causes in the oriental medicine. One is natural. The other is acquired. Acquired cases have the following causes: shi-re-nei-yun[濕熱內蘊]. xie-뱌-bu-huo[血氣不和], gan-qi-yu-jie[肝氣鬱結]. 3 There are two therapies in the oriental medicine. One is internal and the other external. out of the two, external therapies were mainly used according to the literature studies that I have consulted. 4. According to my study, the most frequently used herbal medicine was Alunitum(明 礬)(45 times), followed by Minium(密陀僧)(39 times) and Moschus(?香)(21 times respectively). 5. My study also found that bian-zheng[辨證] was not .rarely listed on old literatures. Therefore, old literatures did not clearly show how to root out the disease. They only taught now to alleviate the symptoms and remove the characteric odor.

• Korean Journal of Medicinal Crop Science
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• v.15 no.6
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• pp.417-428
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• 2007

Most oriental medicinal plants in domestic markets have been imported, but these medicines are being easily exposed to many insect pests because of the poorness of storage facilities. This study was carried out to identify stored products insect pests occurring in 158 storage medicinal plants belonging to 134 genera of 67 families. No insect pests were not observed in 44 medicinal plants including Artemisia argyi Levl. et Vant., Cassia sieboldii Presl., and Juniperus chinensis L. Most commonly observed stored products insect pests in the surveyed medicinal plants were the order of as follows; Ahasverus advena(Waltl) 12.3%, Lasioderma serricorne F. 11.5%, Oryzaephilus surinamensis L. 10.3%, Tribolium castaneum (Herbst) 9.4%, Stegobium paniceum L. 8.4%, and Plodia interpunctella(Hbner) 7.9%. And these insects also are likely to prefer more root or rhizome part than the other ones. Based on these basic survey results, natural products researchers can obtain an important information in finding an insecticidal or fumigant compounds contained in the medicinal plants which any insect pests do not attack.

• Journal of the Korean Institute of Gas
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• v.14 no.4
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• pp.31-36
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• 2010

An alternative method is presented for predicting failure probability of pipelines with corrosion defects in this paper. The failure of corroded pipeline occurs when the operating pressure is grater than the remaining strength of the pipeline, and a limit state function can be defined as the differences between the remaining strength and the operating pressure. Then, based on structural reliability theory, we can estimate the failure probability of corroded pipeline, which is dependent on elapsed time of the pipeline with active corrosion defects. In this study, a root finding (RF) method has been adopted to solve the limit state function instead of Monte-Carlo simulation (MCS) method which traditionally has been employed to solve those kinds of problems. The calculation results shows that there are only small differences between the RF and the MCS method but the RF has higher efficiency in calculation than the MCS.

• Natural Product Sciences
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• v.14 no.4
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• pp.215-220
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• 2008

Hypolipidemic effect of Insamsansa-eum (ISE, Ren-Shen-Shan-Zah-Yin in Chinese) consisted of Red ginseng (RG; the steamed root of Panax ginseng C.A. Meyer) and Crataegii fructus (CF, the fruit of Crataegus pinnatifida BGE) is used frequently in China and Korea as a herbal medicine to treat arteriosclerosis, was investigated. Treatment of ISE significantly reduced blood triglyceride (TG) and total cholesterol (TC) levels in Triton WR-1339-induced hyperlipidemic mice and serum TG levels in corn oil-induced hypertriglyceridemic mice. ISE significantly lowered the high blood TG and TC levels as well as body and epididymal mass weights in hyperlipidemic mice induced by long-term feeding of a high-fat diet and increased blood HDL cholesterol level. ISE and its ingredients, RG and CF, inhibited pancreatic lipase and HMG-CoA reductase activities. Of its ingredients, RG reduced the blood TC level and HMG-CoA reductase activity more than CF. CF reduced blood TG level and pancreatic lipase activity more than RG. These finding suggest that the antihyperlipidemic effect of ISE may be due to synergistic inhibition of HMG-CoA reductase and pancreatic lipase by RG and CF, and that ISE may be effective hypolipidemic agents.