• Proceedings of the Korea Information Processing Society Conference
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• 2013.05a
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• pp.480-481
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• 2013

클라우드 서비스를 위한 가격결정은 서비스 제공자 중심의 정책으로 수립되어 가장 큰 이익을 줄 수 있는 모델로 제안되고 있다. 하지만, 클라우드 서비스 브로커 개념의 등장으로 서비스 중개 방식을 이용하여 서비스 제공자와 소비자 모두에게 이익을 줄 수 있는 모델을 제공하고자 노력하고 있다. 이와 같은 노력에 있어 가격결정 정책에 대한 분석을 수행하고 그를 만족할 수 있는 모델을 제안한다. 클라우드 브로커가 사용자의 서비스 미사용량과 SLA를 기반한 서비스 품질을 기준으로 환불 등의 서비스를 제공하는 모델이다. 이와 같은 모델은 클라우드 서비스 활성화에 큰 도움이 될 것으로 기대된다.

• Proceedings of the Korea Information Processing Society Conference
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• 2009.11a
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• pp.693-694
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• 2009

멀티미디어 기기의 발달과 인터넷의 확산 등의 영향으로 디지털 콘텐츠의 제작 및 유통이 일반화되면서 시장 활성화가 되었지만 불법복제로 인한 시장에 악영향도 미치고 있다. 그리하여 DRM이란 정보보호 기술이 일반화되고 그 기능이 중요하게 되었다. 본 논문에서는 기존의 데이터 전체를 암호화하는 방식의 DRM 시스템과는 달리 H.264/AVC의 특성을 이용하여 콘텐츠의 일부만을 암호화하여 서버에 최소한의 영향을 주면서 영상을 전송할 수 있는 효과적인 DRM 시스템을 제안하였다.

• Proceedings of the Korea Information Processing Society Conference
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• 2009.11a
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• pp.691-692
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• 2009

노드의 이동성을 지원하는 Mobile IPv6에서는 단말과 홈 에이전트 간 시그널링 처리로 인한 부하를 줄이기 위해 Proxy Mobile IPv6가 제안되었다. 그러나, Proxy Mobile IPv6 역시 서브넷 이동에 따른 재인증 프로세스로 인해 지연이 발생하며 현재까지 Mobile IPv6와는 달리 보안 취약점에 대한 분석과 그에 맞는 보안 기법이 미비한 상황이다. 본 논문에서는 현재까지의 Proxy Mobile IPv6에 대한 보안 취약점 분석을 통해 안전한 핸드오버 기법을 제안한다.

• Journal of Life Science
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• v.20 no.6
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• pp.819-824
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• 2010

Genus Phyllostachys is a long-lived woody species primarily distributed throughout South East Asia. Many species of this genus has been regarded as medically and ecologically important in the world. We evaluated representative samples of the four taxa with RAPD to estimate genetic relationships within the genus Phyllostachys. The percentages of polymorphic loci were 8.9-33.3% at the species level. P. bambusoides was found to show lower genetic diversity (H=0.018) than other species. Total genetic diversity ($H_T$) was 0.315, genetic diversity within populations ($H_S$) was 0.043, the proportion of total genetic diversity partitioned among populations ($G_{ST}$) was 0.659 and the gene flow (Nm) was 0.0263. As some Korean populations were isolated and patchily distributed, they exhibited low levels of genetic diversity. The four taxa of the genus Phyllostachys analyzed were distinctly related to a monophyletic. P. nigra var. henonis. Stapf was found to be more closely related to P. pubescens than to P. nigra. P. bambusoides was quite distinct from the remaining species.

• Journal of Korean Medicine for Obesity Research
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• v.3 no.1
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• pp.75-84
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• 2003

Objective : In Western medicine, the cause of obesity include overeating, lack of exercise, genetic factor, endocrinal impediment and psychological factor. Since the society becomes more complexed and the tensions among social members gets intensified, psychological factor getting more important. In Oriental medicine, Seven Emotion(七情, in oriental medical term) as an emotional stressor was thought to be a factor of obesity. Therefore the purpose of this study is to examine the relationship between Seven Emotion and obesity in detail. Methods : overview the stress with the view of Oriental medicine and research the relationship between Seven Emotion as an emotional stressor and obesity. Results : 1. Seven Emotion can be understood as an emotional stress in Western medicine. If Seven Emotion is excessive, its extreme mental stimulation causes physical illness. 2. Having influence upon the function of internal organs, excessive Seven Emotion causes obesity. Since it hinders normal flow of Gangi(肝氣), Seven Emotion disturbs healthy function of Bi-Wi(脾胃) and normal fluctuation of Qi. Consequently, obesity is resulted from the accumulation of fat since normal metabolism of body is disrupted. 3. In Seven Emotion-Anger(怒), Joy(喜), Anxiety(憂), Thought(思), Sorrow(悲), Fear(恐), Surprise(驚)-give rise to Gan-bi-bul-wha(肝脾不和), Sim-hi-yang-huh(心脾兩虛), Bi-qi-huh(碑氣虛), Dam-sup-jeo-po(痰濕沮胞) and Wi-wha-sang-youm(胃火上炎) in type of symptom in obesity and therefore, cause obesity.

• Journal of radiological science and technology
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• v.4 no.1
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• pp.45-53
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• 1981

In examinations of the stomach roentgenography, it is imperative to obtain adequate film density throughout all its different regions. Therefore, it is necessary to use more sophiscated exposure techniques. In order to achieve these purpose, the radiologic technologists must be measured abdominal thickness in variations with patient positions. In consideration of these problem, the author was made an experiment on correction method of kVp and mAs by abdominal thickness in roentgenography of the stomach. The results were summarized as follws: 1. When the patient in erect position, abdominal thickness was the most thickened at the level of 3cm inferior to umbilicus without regard to body habitus and it was the most thickened at the level of 3cm superior to umbilicus in prone and supine position. 2. As a result of measuring film density for stomach, the adequate film density was represented from 0.70 to 2.49 in erect position and $0.28{\sim}1.18$ in supine position, $0.5{\sim}2.45$ in prone position. 3. In order to obtain uniform film density in 1.25, the correction factor for kVp by abdominal thickness was represented average ${\pm}4.5kVp\;per\;{\pm}1cm$ in a fixed 50 mAs, and average ${\pm}3.9kVp\;per\;{\pm}1cm$ in a fixed 100mAs. 4. In order to obtain uniform film density in 1.25, the correction factor for mAs by abdominal thickness was represented average ${\pm}30.9%\;per\;{\pm}1cm$ in a fixed 80 kvp and ${\pm}26.9%\;per\;{\pm}1cm$ in a fixed 100kVp.

• The Korea Journal of Herbology
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• v.26 no.2
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• pp.39-43
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• 2011

Objectives : This study was conducted to evaluate the acute toxicity and safety of Ssanghwa-tang (Shuanhetang in Chinese, Sou-wa-to in Japanese) in Crl : CD Sprague-Dawley (SD) rat though the current regulatory guideline. Methods : In this study, 10 rats of each sex were randomly assigned to two groups of 5 rats each and were administrated singly by gavage at dose levels of 0 and 2000 mg/kg/day of ssanghwa-tang water extract (SHT). After single administration of SHT, mortalities, clinical signs, body weight changes, gross findings were observed for the 15-day period. Results : Acute toxicity tests revealed that a single oral administration of SHT at dose levels of 2000 mg/kg did not affect clinical signs, body weight, and gross findings, evaluating the safety of SHT. The SHT treatment did not result in any toxicologically significant changes in mortality, clinical signs, body weight changes. Conclusions : These results showed that the single oral administration of SHT did not cause any toxic effect at the dose levels of 2000 mg/kg/day in rats. In conclusion, the median lethal dose (LD50) of SHT was considered to be over 2000 mg/kg/day body for both sexes.

• The Journal of Advanced Prosthodontics
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• v.3 no.1
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• pp.25-32
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• 2011

PURPOSE. The purpose of this study was to assess the prevalence and extent of clinical attachment loss of periodontal tissue and to find out variables related to clinical attachment loss (CAL) in Korean adults older than 40 years of age. MATERIALS AND METHODS. Data were collected from 2,519 subjects who were part of a cohort study conducted in Ansan city by Korea University Medical School for Korean Genome project. Age, sex, smoking, drinking, fast glucose, blood pressure, obesity and total cholesterol levels were examined. The oral examination included probing pocket depth, gingival recession and CAL of Ramford's teeth. The severity of periodontitis was classified based on the mean value of CAL. The relationship between each risk factor and the severity of CAL was independently estimated using the chi-square test, the test or one-way ANOVA. Multiple regression analysis was used to determine the significance of each factor in the periodontal disease. RESULTS. The prevalences of clinical attachment between 1 and 3 mm, between 3 and < 5 mm, and ${\geq}$ 5 mm were 80.27%, 16.75% and < 1%, respectively. Although the univariate analysis showed age, gender, smoking, fasting glucose, blood pressure and total cholesterol levels were significantly related to the severity of CAL, multiple regression analysis indicated that age (P < .0001), gender (P < .0001) and smoking (P < .05) were only significantly related. CONCLUSION. Older age, male gender and smoking were significant risk factor for the increase of CAL, and these may be useful indicators of periodontitis high-risk groups.

• Journal of the Korean Institute of Gas
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• v.15 no.5
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• pp.7-12
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• 2011

LPG(Liquefied Petroluem Gas) Vehicles in metropolitan area being applied to improve air quality and have been proven effective for the reduction of air pollution. These gas stations are required to safe the storage tank because of possibility of causing huge loss of life and property. While storage tanks above ground have potential risk of explosion if fire breaks out and those under-ground are difficult to inspect due to poor accessibility neither above nor under-ground tank can serve us well. This study used the RPS-TRIZ (Rapidly Problem Solving-Teoriya Resheniya Izobretatelskikh Zadatch) technique and suggested the use of under-ground containment storage tank as a solution for safety issues and safety inspection.

• Archives of Plastic Surgery
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• v.33 no.5
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• pp.616-620
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• 2006

Purpose: The isolated human chondrocytes for cartilage reconstruction and transplantation presents a major problem as these cells would change biologically in vitro. For more effective applications of these cells in the clinical field, it is necessary to get a large amount of cells in a short period without affecting their function and phenotype. Methods: This study reports the effects of placenta extract on chondrocytes in vitro. We initiated this study on the basis of the hypothesis that placenta extract can influence both the proliferation of chondrocytes and their biologic functions(for example, to express cell specific gene or to produce their own extracellular matrix). Chondrocytes in monolayer culture with or without placenta extract were collected and analyzed by MTT assay, ECM assay, and RT-PCR. Results: Placenta extract stimulated the proliferation of chondrocytes in monolayer culture. The phenotype of chondrocytes was well maintained during the expansion in monolayers. Chondrocytes expanded in the presence of placenta extract produced ECM, glycosaminoglycan, abundantly. Compared to chondrocyte expanded in culture medium only, chondrocytes expanded with placenta extract demonstrated higher COL2A1 expression that was biochemically comparable to primary chondrocytes. This study provides an evidence that placenta extract is helpful to expand chondrocytes during tissue cultivation, to maintain their differentiated phenotype and to promote their function. Conclusion: These results suggest that placenta extract during cultivation play an important role in controlling cell behaviors. Furthermore, these results provide a biologic basis for cartilage tissue engineering.