• 정보처리학회논문지C
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• 제17C권1호
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• pp.37-46
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• 2010

IPTV 시스템에서 콘텐츠 및 서비스 제공자의 권익보호는 수신제한시스템(CAS, Conditional Access System) 및 디지털저작권관리(DRM, Digital Right Management)를 통해서 이루어진다. 특히 CAS의 경우, 계층화된 인증키를 사용하여 권한이 있는 사용자에게만 암호화된 콘텐츠를 복호화할 수 있도록 한다. 하지만 CAS가 콘텐츠 제공자와 스마트카드(SC, Smart Card) 사이 구간만의 보안을 제공하기 때문에 셋톱박스(STB, Set-Top Box)와 SC 간 보호 받지 못하는 채널을 도청하는 McCormac Hack 공격이나 SC 복제 공격으로부터 시스템을 보호할 수 없다. 본 논문에서는 McCormac Hack 공격뿐 만 아니라 SC 복제 공격에도 강건하면서 다중 STB를 지원할 수 있는 SC / STB 인증 기법을 제안한다. SC 복제 공격을 막기위해 SC등록 단계에서 STB와 SC를 바인딩하였던 기존 기법은 다중 STB환경을 지원하지 못한다. 제안하는 시스템은 가입자관리시스템에서 STB 정보를 IPTV의 양방향 채널 특성을 이용하여 동적으로 갱신함으로서 사용자의 다중 STB를 효과적으로 지원한다.

• 한국콘텐츠학회논문지
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• 제10권1호
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• pp.399-406
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• 2010

본 연구는 일본 대학생들이 맥도날드 브랜드 개성에 대한 선호도, 만족도, 재방문에 어떤 영향을 미치는지 파악함으로써 고객을 유인하고 유지하기 위한 기초자료를 제시하고자 한다. 설문지는 일본 도쿄에 거주하는 대학생을 대상으로 150부를 배포하였고, 128부를 분석에 활용하였다. 실증분석을 통한 결과는 다음과 같다; 첫째, 브랜드 개성 중요도에서 '현대적인', '활달한', '친근한', '젊은' 순으로 나타났다. 이는 IT문화에 익숙한 젊은층이 음식을 주문하고 기다리면서 테이블에 있는 컴퓨터로 오락과 콘테츠를 즐길 수 있는 공간이 제공되기 때문이다. 둘째, 브랜드 개성에서 '성실성', '지성/전문성', '건전성' 요인이 선호도와 만족도에 유의적인 영향을 미치는 것으로 나타났다. 전문적이면서 변함없이 신뢰할 수 있는 이미지가 부각될 때 선호도와 만족도가 높게 나타나는 것이다. 셋째, '성실성', '지성/전문성' 요인이 재방문에 유의적인 영향을 미치는 것으로 나타났다. 맥도날드에 대한 전문적이고 친근한 이미지를 더욱더 강화시킴으로써 고객이 재방문하도록 유도해야 할 것이다. 결과적으로 제품과 서비스에 대해 선호도와 만족도가 높으면 재구매로 직결되는 것으로 나타났다.

• 한국생산제조학회지
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• 제19권1호
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• pp.89-93
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• 2010

This paper describes the analysis of state when load applies to McPherson strut assembly. Strut assembly except knuckle-arm are created with 3 dimensional modeling program. Stress and structural strength on this model are analyzed by analysis program as load applies on the lower part of assembly modeling. When McPherson suspension is applied with 3000N at Z direction, maximum stress at spring becomes 433MPa and the cycle of minimum life is 4321. The designed modeling suspension at this study has no possibility with resonance.

• 지식경영연구
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• 제11권4호
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• pp.21-39
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• 2010

Recommender system is a core component of e-commerce. Correspondingly, metrics to evaluate the system performance have been developed and applied. However, even though we have lots of applications that have tried to adopt recommender systems, the dearth of successfully installed recommender systems for more than a decade leads us to a skeptical thinking that current metrics do not sufficiently indicate the recommender system success in business viability point of view. Hence, the purpose of this paper is to reconfigure measures for recommender system success. Adopting DeLone and McLean's amended model of information system success as the underlying framework, content analysis with intellectual properties on recommender systems was conducted to modify the currently used metrics. Then a model of recommender system success is proposed based on the newly identified metrics are compared with traditional metrics.

• Journal of Microbiology and Biotechnology
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• 제31권1호
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• pp.137-143
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• 2021

Most cervical cancers are associated with high-risk human papillomavirus (HPV) infection. Currently, cervical cancer treatment entails surgical removal of the lesion, but treatment of infection and preventing tissue damage are issues that still remain to be addressed. Herbal medicine and biological studies have focused on developing antiviral drugs from natural sources. In this study, we analyzed the potential antiviral effects of Pinus densiflora Sieb. et Zucc. leaf extracts against HPV. The pine needle extracts from each organic solvent were analyzed for antiviral activity. The methylene chloride fraction (PN-MC) showed the highest activity against HPV pseudovirus (PV). The PN-MC extract was more effective before, rather than after treatment, and therefore represents a prophylactic intervention. Mice were pre-treated with PN-MC via genital application or oral administration, followed by a genital or subcutaneous challenge with HPV PV, respectively. The HPV challenge results showed that mice treated via genital application exhibited complete protection against HPV. In conclusion, PN-MC represents a potential topical virucide for HPV infection.

• 동의신경정신과학회지
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• 제21권2호
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• pp.29-44
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• 2010

Objectives : The purpose of this study was to investigate the effect of Gentianae Radix on neurogenesis and apoptosis in ethanol- induced newborn rats hippocampus dentate gyrus. Methods : In vivo, laboratory animals were divided into three groups; Normal group(N), Control group(C) and Treated group (TG)(n=7 for each group). N were treated saline daily for five days. C were treated 1.5 g/kg ethanol and saline daily for five days. TG were treated 1.5 g/kg ethanol and 300 mg/kg Gentianae Radix daily for five days. BrdU(5-bromo-2-deoxyuridine) assay was used to test neurogenesis in the dentate gyrus. And TUNEL(Terminal deoxynucleotidyl transferase dUTP nick end labeling) assay was used to test apoptosis in the dentate gyrus. Three groups were measured body weight, serum ethanol concentration, BrdU-positive cells and TUNEL-positive cells in the dentate gyrus. In vitro, MTT(3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide) assay was used to test viability in SK-N-MC cells. BrdU assay was used to test neurogenesis in SK-N-MC cells. DNA fragmentation and caspase-3 enzyme activity assay were used to test apoptosis in SK-N-MC cells. And treated ethanol and Gentianae Radix of all in vitro tests were made various concentration. Results : In vivo, Gentianae Radix modulated ethanol-induced neurogenesis and apoptosis in newborn rats hippocampus dentate gyrus. In vitro, TG 100 ${\mu}g/ml$ have significantly modulated ethanol-induced neurogenesis and apoptosis in SK-N-MC cells. And only TG 100 ${\mu}g/ml$ have significantly protected SK-N-MC cells from ethanol-induced cytotoxicity. Conclusions : Gentianae Radix may have the effect that modulated ethanol-induced neurogenesis and apoptosis in SK-N-MC cells.

• 복식
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• 제62권6호
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• pp.165-181
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• 2012

Alexander McQueen is a typical designer of unconventional and experimental design who showed maximalism through outstanding tailoring. The purpose of this research is to study formative characteristics of maximalism that are expressed in modern fashion based on the works of Alexander McQueen, and to suggest boundless possibilities of development through his sense of design and the expressive ability of his works. Theoretical considerations will be made through literature research and precedent studies, and the collection data for case analysis will be used to select ready-to-wear women's collections from 2001 S/S to 2010 F/W by referring to internet sites. The study results are as follows. First, the most representative characteristic of formative characteristics of maximalism expressed in Alexander McQueen's works is expandability. Second, decorations used as a part of detail on clothes is used as decoration itself, and handcraft expression is shown through excessive use of decorations. The expandability of decoration that emphasizes splendid magnificence is expressed through flawless technique. Third, the fusion of each different image and the combination of ethnic image and modern image was most prevalent. Fourth, fantasy expresses a fictive image that could not be seen in reality by expressing an unrealistic and maximized image through the imagination of designer. Fifth, experimental element is expressed as an image that actively reflects the challenging spirit, which suggests a new direction of beauty through shocking and extraordinary images of the inner world of the designer and the root of new ideas about inhumane modern society.

• 한국식품영양과학회지
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• 제39권2호
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• pp.203-209
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• 2010

본 연구를 통하여 여주 추출물은 세포 증식을 제외하고는 조골세포에 긍정적인 영향을 미치지 못하였지만 머위 추출물은 세포의 증식, ALP 활성, bone nodule의 형성이 대조군과 비슷한 결과를 나타내거나 높은 경향을 나타냄으로써 조골세포의 골 형성 과정인 증식, 기질의 성숙, 기질의 석회화의 세 단계에서 유효성을 증명하였다. 또한 OPG mRNA의 2배 이상의 증가는 조골세포의 골 형성에 주요 매개 물질로서 가능성이 있음을 밝혔다. 따라서 머위 추출물은 골수의 미세 환경에서 세포의 조절작용을 하는 물질로 여겨지며, 골다공증을 포함한 각종 골 결손 질환의 예방과 치료약 개발에 긍정적인 가능성을 제시할 것이라 사료된다.

• 대한전자공학회논문지TC
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• 제47권8호
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• pp.9-15
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• 2010

본 논문에서는 비동기 MC-CDMA 상향 링크 시스템의 주파수 옵셋의 영향을 주파수 선택적 다중경로 페이딩 채널에 대하여 분석하였다. 분석을 위하여 모든 사용자의 주파수 옵셋(FO: frequency offset)을 확률 변수들로 가정하였으며 원하는 사용자에 대한 주파수 옵셋 추정과 그 보상이 이루어짐을 가정하였다. 따라서 원하는 사용자의 경우 잔류 주파수 옵셋(residual frequency offset)이 존재하게 된다. 본 논문에서는 이러한 잔류 주파수 옵셋의 평균 오류율(BER: bit error rate)에 대한 영향을 분석한다. 우선 의사 분석적 기법(Semi-analytical method)으로 평균 오류율을 유도하고 근사화를 통하여 평균 오류율 성능을 받혀진 형태로 유도하였다. 이에 더하여 잔류 주파수 옵셋에 의해 야기되는 SNR(signal to noise ratio) 감쇄를 조사하였다. 유도된 결과를 통하여 원하는 사용자의 주파수 옵셋 추정 오류가 정규화된 값으로 0.1보다 작은 경우에는 시스템 성능 저하정도가 적음을 확인하였다.

• 한국발생생물학회지:발생과생식
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• 제14권4호
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• pp.261-268
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• 2010

As in the O. mykiss electrophoretic profiles of RNA, the signals of each RNA sample from 9 individual tissues such as liver, muscle, brain, heart, pituitary gland, kidney, intestine, spleen and gill similar to positive control were obtained. The tissue distributions of the complimentary DNA (cDNA) of O. mykiss four genes were analyzed using quantitative real-time PCR with primer sets for tissue expression analysis. In this rainbow trout species, author obtained bands of various sizes, ranged from 700 bp to 1,400 bp. A dissociation curve was made at the end of each run to make sure that there was no non-specific amplification. Supplementarily, the Ct of each DNA was compared. The Ct values of vinculin with rainbow trout tissues were determined in a manner similar to those for agouti-related protein (AgRP) and melanocortin receptors (MC4R I and MC4R II). Further, obtained Cts for standard curve of each DNA were affected by specific product (vinculin, AgRP and MC4R II genes). After several experiments with four individual genes of rainbow trout, author estimated a variation ratio of the mean Ct value of the DNA extracted using the comparative CTt method was 37.27, and the standard deviation was 5.33. The correlation coefficient between the Ct values and the concentration of cDNA was -0.98, -0.99, -0.91 and -0.86, respectively (vinculin, AgRP, MC4R I and MC4R II genes). Since this correlation showed high linearity, the straight line obtained was used as a standard for the O. mykiss tissues reared in aquarium. A PCR efficiency of 100% is ideally achieved when the slopes are close to the theoretical value of -3.31. According to quantification method, the results of quantification are strongly affected by the DNA fragmentation. The size of most DNA fragments obtained from various tissues of rainbow trout used in the experiment was approximately 100 bp. According to the four slopes, an efficiency of nearly 100% was estimated for four genes detection methods. Additionally, further analysis with more individuals and primers will be required to fully establish optimization in rainbow trout.