• 생명과학회지
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• 제14권3호
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• pp.425-428
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• 2004

ISSR마크를 사용하여 고려 인삼의 품종 및 계통간 분자적 인증과 유전적 다형현상을 조사하였다. 56개의 ISSR 프라이머 중 5개가 일곱 품종 및 계통간 명확하고 재현성이 높은 DNA분절을 나타내는 최적 프라이머로 선택되었다. 전체 43밴드는 250 bp - 1,700 bp의 분자량을 가지며 프라이머당 8.6개의 밴드를 나타내었다. 고려 인삼에서 다형현상 정도는 20.9%였다. 특히 천풍 품종이 가장 높은 다형현상을 나타낸 반면 다른 품종은 거의 다형현상을 나타내지 않았다. 결론적으로 DNA수준에서 ISSR마크로 천풍이 다른 고려 인삼의 품종 및 계통인 연풍, 황숙종, 자경종과 구분에 이용될 수 있음이 판명되었다.

• 정보처리학회논문지C
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• 제12C권4호
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• pp.481-488
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• 2005

현재 무선 네트워크 IP를 위한 이동성 자원의 표준인 Mobile IP는 이동 노드(Mobile Node, MN)의 접속에 관한 사용자 인증이 비효율적이다. 본 논문에서는 네트워크 구성원들의 상호 인증 및 보안 서비스를 위해서 인증(Authentication), 권한부여(Authorization) 및 과금(Accounting)을 지원하는 AAA 프로토콜에 기반하여 Mobile IP의 보안성을 유지하고 빠른 핸드오프를 수행하는 새로운 보안 핸드오프 방식을 제안한다. AAA 프로토콜은 QoS를 제한하는 비효율적인 인증 절차가 존재하여 MN이 핸드오프를 수행할 때마다 새로운 세션 키를 분배 받아야 한다. 본 논문에서는 MN이 핸드오프를 수행할 때 발생하는 지연 시간과 MN의 인증으로 인한 AAA 서버의 오버헤드를 줄이고자 공유(Overlap, 오버랩) 네트워크 구조 기반의 세션키 재사용 방법을 제안한다 본 방식에서는 MN의 보안성 향상을 위하여 공유 세션 키를 유선상에서 전달하는 방식에 기반하고, 그에 따라 신속하고 자연스러운 핸드오프 메커니즘을 제공한다. 분석적 모델링결과에 의하면 제안하는 방식은 기존 세션키 재사용 방식과 비교하여 핸드오프 시간을 고려하는 핸드오프 실패율에 있어서 $40\%$정도의 성능향상을 보인다.

• 한국전자거래학회지
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• 제13권1호
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• pp.33-43
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• 2008

인터넷의 광범위한 응용과 더불어 인터넷 보안은 최근 중요한 관심사가 되고 있다. 악의의 행위를 방지하기 위한 보안 시스템은 구성 요소 및 동작의 완결성이 보장되어야만 시스템의 안전성을 보증할 수 있게 된다. 어느 한 부분의 약점은 전체 시스템의 완결성에 치명적인 결과를 발생하게 된다. 따라서 각각의 보안 요소마다 다양한 기법 및 응용에 대한 연구와 시스템적 응용에 대한 연구가 활발히 이루어지고 있다. 본 논문에서는 지문의 특징을 이용한 OTP의 일회용 암호 키를 생성하는 방법을 제안한다. 본 연구는 잘 알려진 강력한 개인 인증요소인 지문 정보를 이용하여 가변적이고 안전한 일회용 암호 키를 생성하였으며, 또한 제안 기법에 대한 시뮬레이션을 통해 성능을 분석하였다.

• Journal of Forest and Environmental Science
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• 제25권1호
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• pp.57-65
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• 2009

Ficus deltoidea Jack is an important and popular medicinal plant species found in the Malaysia. Plants are being collected and used based on morphology and authentication to prevent adulteration is not in practice. In this study, twenty-six accessions of F. deltoidea Jack were collected from Kelantan and Terengganu states of Peninsular Malaysia to examine their genetic similarities and differences using randomly amplified polymorphic DNA (RAPD) technique. Out of 20 arbitrary primers, two primers (D-10 and D-11) were selected which produced reliable DNA polymorphism. D-10 and D-11 primers generated 138 RAPD bands ranging from 250 bp to 3000 bp. Ninety-nine of them were polymorphic loci (72%) and thirty-nine were nonpolymorphic loci (28%). A total of 56 bands with polymorphic loci were amplified with primer D-10 and analyzed by cluster analysis and UPGMA to present a dendrogram depicting the degree of genetic relationship among 26 accessions. Eight RAPD markers were sequenced to determine their identity. RAPD analysis showed the genetic diversity among 26 accessions of F. deltoidea Jack. The RAPD profile and RAPD marker sequences reported in this paper could be used in plant and/or plant material authentication. This study also suggested that RAPD can be a useful technique to study DNA polymorphism in F. deltoidea Jack.

• 아태비즈니스연구
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• 제6권1호
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• pp.27-43
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• 2015

The objective of the present study is to identify the security factors that influence customer trust towards intention to continue using Internet banking in Malaysia. The participants are individual Internet banking users in Peninsular Malaysia. Data was collected through self-administered questionnaires distributed using the drop-off and pick-up (DOPU) technique to bank branch managers who then passed the questionnaires to their customers. A total of 413 respondents completed the questionnaires. The SPSS statistical analysis software package and Partial Least Squares statistical method were used for data analysis and hypothesis testing. The results show that authentication, confidentiality, data integrity and non-repudiation are significant factors that influence customer trust towards intention to continue using Internet banking. Trust plays a critical role in influencing the intention to continue using Internet banking in Malaysia while perceived privacy does not. An understanding of the factors identified in this study will enable Internet banking providers to effectively and efficiently enhance the security of services and thereby promote continued usage of Internet banking among customers. The findings of this study are thus expected to be of great use to Internet banking providers as improvements in Internet banking security will increase business in the long run.

• 한국축산식품학회지
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• 제33권1호
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• pp.39-44
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• 2013

Origin authenticity of the animals used as food has always been a major concern to consumers around the world. In the past twenty years, a stable isotope ratio has been used for origin authentication. In this study, pork samples, both local and imported, were collected from the major markets from all around South Korea and analyzed for stable isotope ratios of nitrogen (${\delta}^{15}N$‰) and carbon (${\delta}^{13}C$‰), using Isotope Ratio Mass Spectrometry (IR-MS). A total of 599 samples with 335 Korean and 264 imported from 13 countries within America and Europe were investigated in accordance to the standard established methods for isotope ratio analysis. The results showed a significant variation related to the origin of the samples, explaining the difference in the feeding styles of the pork in each country. The stable isotope ratio values of carbon (${\delta}^{13}C$‰) were found in the decreasing order of: America ($-15.55{\pm}1.01$‰)>Korea ($-19.62{\pm}0.89$‰)>Europe ($-24.79{\pm}1.35$‰). Canada was having ${\delta}^{13}C$ ratio of $-22.87{\pm}0.92$‰, which is very low in the region of America and very close to Europe (-23.78 to -27.17‰). For nitrogen ${\delta}^{15}N$‰ the order was: America ($4.92{\pm}0.71$‰)>Europe ($4.54{\pm}0.66$‰)>Korea ($3.69{\pm}0.54$‰), with a slight variation among countries in each region studied. From the results it was concluded that the stable isotope ratio of the pork samples from different countries provide enough information about the origin and is therefore a potential tool which can be employed for origin authentication.

• 한국컴퓨터정보학회논문지
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• 제3권4호
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• pp.120-125
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• 1998

기업 업무 효율이나 정보화를 위하여 우리나라의 기업, 대학 등에서는 네트워크망을 구축하고 있는데, 대부분 보안에 대한 자문없이 시공회사에서 획일적인 솔루션을 제공하고 있다. 이로 인해 여러 가지 보안 문제가 발생하고 있다. 본 연구에서는 차단시스템, 암호화시스템, 인증시스템 등 세 가지 정보 보안시스템을 중심으로 효율적인 네트워크 보안시스템 구축 방법을 기술해보았다.

• Journal of Communications and Networks
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• 제18권1호
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• pp.105-111
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• 2016

Trust models in the literature of MANETs commonly assume that packets have different security requirements. Before a node forwards a packet, if the recipient's trust level does not meet the packet's requirement level, then the recipient must perform certain security association procedures, such as re-authentication. We present in this paper an analysis of the epidemic broadcast delay in such context. The network, mobility and trust models presented in this paper are quite generic and allow us to obtain the delay component induced only by the security associations along a path. Numerical results obtained by simulations also confirm the accuracy of the analysis. In particular, we can observe from both simulation's and analysis results that, for large and sparsely connected networks, the delay caused by security associations is very small compared to the total delay of a packet. This also means that parameters like network density and nodes' velocity, rather than any trust model parameter, have more impact on the overall delay.

• 정보보호학회논문지
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• 제6권4호
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• pp.53-66
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• 1996

World Wide Web is a total solution for multi-media data transmission on Internet. Because of its characteristics like ease of use, support for multi-media data and smart graphic user interface, WWW has extended to cover all kinds of applications. The Secure Information Center(SIC) is a data transmission system using conventional cryptography between client and server on WWW. It's main function is to support the encryption of sending data. For encryption of data IDEA(International Data Encryption Algorithm) is used and for authentication mechanism MD5 hash function is used. Since Secure Information Center is used by many users, conventional cryptosystem is efficient in managing their secure interactions. However, there are some restrictions on sharing of same key and data transmission between client and server, for example the risk of key exposure and the difficulty of key sharing mechanisms. To solve these problems, the Secure Information Center provides encryption mechanisms and key management policies.

• Journal of Ginseng Research
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• 제45권2호
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• pp.246-253
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• 2021

Background: Ginseng is one of the most valuable herbal supplements. It is challenging to perform quality control of ginseng products due to the diversity of bioactive saponins in their composition. Acid or alkaline hydrolysis is often used for the structural elucidation of these saponins and sugars in their side chains. Complete transformation of the original ginsenosides into their aglycones during the hydrolysis is one of the ways to determine a total saponin group content. The main hurdle of this approach is the formation of various by-products that was reported by many authors. Methods: Separate HPLC assessment of the total protopanaxadiol, protopanaxatriol and ocotillol ginsenoside contents is a viable alternative to the determination of characteristic biomarkers of these saponin groups, such as ginsenoside Rf and pseudoginsenoside F₁₁, which are commonly used for authentication of P. ginseng Meyer and P. quinquefolius L. samples respectively. Moreover, total ginsenoside content is an ideal aggregated parameter for standardization and quality control of ginseng-based medicines, because it can be directly applied for saponin dosage calculation. Results: Different hydrolysis conditions were tested to develop accurate quantification method for the elucidation of total ginsenoside contents in herbal products. Linearity, limits of quantification, limits of detection, accuracy and precision were evaluated for the developed HPLC-MS method. Conclusion: Alkaline hydrolysis results in fewer by-products than sugar elimination in acidic conditions. An equimolar response, as a key parameter for quantification, was established for several major ginsenosides. The developed approach has shown acceptable results in the analysis of several different herbal products.