• Journal of the Korea Institute of Information Security & Cryptology
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• v.15 no.2
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• pp.23-36
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• 2005

The main obstacle hindering the wide deployment of identity-based cryptosystem is that the entity responsible for creating the private key has too much power. As a result, private keys are no longer private. One obvious solution to this problem is to apply the threshold technique. However, this increases the authentication computation, and communication cost during the key issuing phase. In this paper, we propose a new effi ient model for issuing multiple private keys in identity-based encryption schemes based on the Weil pairing that also alleviates the key escrow problem. In our system, the private key of a user is divided into two components, KGK (Key Description Key) and KUD(Key Usage Desscriptor), which are issued separately by different parties. The KGK is issued in a threshold manner by KIC (Key Issuing Center), whereas the KW is issued by a single authority called KUM (Key Usage Manager). Changing KW results in a different private key. As a result, a user can efficiently obtain a new private key by interacting with KUM. We can also adapt Gentry's time-slot based private key revocation approach to our scheme more efficiently than others. We also show the security of the system and its efficiency by analyzing the existing systems.

• The Research Journal of the Costume Culture
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• v.20 no.4
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• pp.604-615
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• 2012

Despite the increasing recognition of the value of emotions and younger consumers in luxury market segments, little research has focused on the role consumer characteristics and emotions play in younger consumers' commitment to luxury brands. Drawing on the identity-motivation model and the idea of self-construal, this study identifies the contributing factors of younger consumers' commitment to luxury fashion brands. Specifically, this study examines the role of consumer characteristics (i.e., self-construal), the self-expressiveness of brands, and emotional factors (i.e., brand love and brand attachment) in developing consumer-brand relationships. The proposed model was tested with college students in the U.S., which supplied a representative group of younger consumers of luxury fashion brands. The data were collected using web-based surveys and analyzed using structural equation modeling method. The results showed that consumers who were characterized with interdependent self-construal had positive perceptions of self-expressive luxury fashion brands. Furthermore, the perception of self-expressive brands promotes the consumers' brand love of and brand attachmentto luxury fashion brands. Also, while both improved brand commitment, brand attachment had a greater impact on brand commitment than brand love. This study contributes to the literature by identifying driving forces of younger consumers' brand commitment. It also provides managerial implications for luxury fashion brands.

• Journal of Agricultural Extension & Community Development
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• v.8 no.1
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• pp.143-153
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• 2001

Agricultural extension has contributed enormously to agriculture and farmers, since Rural Development Administration(RDA) was founded in Korea. However, as the decentralization got started and world environment has changed, agriculture extension shrank by transferring the function of agricultural extension to local government. According to public opinion appeared on the bulletin boards of RDA web site, many people suggest that agricultural extension should be improved from the current system and services. Findings in the transfer of the extension system from national status to local government showed some advantages and disadvantages; 1) Agricultural extension services was decreased sharply by a large dropping in the number of extension educators. 2) The identity of agricultural extension services was disappearing. 3) The extension projects when matched with local features could be better implemented. 4) The lives of extension educators were better stabilized. Rural Development Administration intends to transfer the director of the local Agriculture Technology Center to the national status. This would return all current extension educators step by step to national positions. By doing so, agricultural extension scholars and farmers are welcoming this agenda. On the other hand, the extension educators themselves were divided by contradictory opinions Therefore, government should search for the better alternatives to establish more effective system with considerations of various aspects in activating the agricultural extension services.

• Journal of Korea Society of Digital Industry and Information Management
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• v.10 no.3
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• pp.87-97
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• 2014

Pharming attack is a confidence trick that the hacker catch away customers financial information on Internet banking. At first, a hacker installs malicious execution code on customers PC in secret. As a customer tries to connect a Internet banking Web site, the malicious code changes it to phishing site in Internet explorer. The hacker catch away customers financial information in process of internet banking. The hacker steals money from customer's bank account using stolen information. PKI is a widespread and strong technology for providing the security using public key techniques. The main idea of PKI is the digital certificate that is a digitally signed statement binding an user's identity information and his public key. The Internet banking service stands on the basis of PKI. However, the bank is trusted in natural, the only customer is certified in the present Internet banking. In this paper, we propose a method of cross certification in Internet banking. The customer certify a bank and the bank certify the customer in proposed method. The method can service to customer the secure Internet banking about pharming attack. We compare the proposed method with other methods.

• 한국HCI학회:학술대회논문집
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• 2006.02b
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• pp.493-498
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• 2006

본 연구에서는 온라인 상에서 대학학위 과정 교육을 목적으로 제작된 외국어 콘텐츠의 웹 아이덴티티 규명의 필요성과 규명된 웹 아이덴티티와 학습동기유발간의 상관관계를 연구하는데 중점을 둔다. 본 연구에서 채택된 외국어 교육 콘텐츠는 타 교육 분야보다 각 민족 언어의 아이덴티티가 시각적으로 재현되는 방식이 다양하다는 점에서 연구대상으로 부각되었다. 본 연구는 기존에 제시된 바 있는 웹 아이덴티티 분석 기준에서 출발하여 온라인 교육 콘텐츠 측면에서 이를 적용 및 재해석하고, 온라인 교육 콘텐츠 의 웹 아이덴티티 기준을 추가하였다. 따라서, 본 연구는 4년제 학사 학위를 수여하는 국내 0 사이버대학교의 외국어 교육 콘텐츠(영어, 일어, 중국어)의 사례를 웹 아이덴티티를 구현하는 세부 요소--시각디자인측면, 사운드측면, 인터페이스측면--에 맞추어 분석을 시도하였다. 또한 웹 아이덴티티가 적용된 각 외국어 교육 콘텐츠의 교육 효과 획득을 위한 학습동기유발 효과와의 상관관계를 알기 위하여 웹 아이덴티티가 적용, 제작된 외국어 교육 콘텐츠와 웹 아이덴티티가 적용되지 않은 채 제작된 외국어 교육 콘텐츠 간의 주의력, 관련성, 자신감, 만족감 등 학습동기유발 효과를 비교하는 설문 조사를 진행하였다. 이를 통해 온라인 외국어 교육 콘텐츠에 있어서 웹 아이덴티티의 개발과 적용이 외국어 교육 효과를 높이는 학습동기유발에 유의미한 역할을 한다는 것이 확인되었다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.37C no.11
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• pp.1027-1035
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• 2012

Recently, the smart phone including web and mobile service based on the reliability and extendability of cloud computing is receiving huge attention. However, most of current cloud services provide just an application service for synchronizing data between mobile entity and server. Business model developed by communication companies have problems with interoperability. This paper proposes a new service security authentication model to efficiently manage smart phone users using different business models between smartphones and to keep the reliability and extendability of cloud computing. Proposed model authenticates for smart phone users to stay with in the unified communication with smart phone user's identity and access control to effectively use the current cloud computing system.

• Journal of the Korea Society of Computer and Information
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• v.12 no.3
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• pp.19-26
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• 2007

In recent rears. web portal system has received much attention as a user interface for the grid environment. Grid system uses symmetric key for authenticating user identity while the traditional portal system does a password-based authentication. Regarding this, many researches are progressing to integrate portal accounts with symmetric key. Specially. researches such as GAMA and PURSE are active and those focus on easy usability for users who familiar with password-based authentication. However the protection of data and resources is a critical issue in Grid environment, because those are shared through a wide-area network. In this paper, we suggest a new authentication mechanism which unify authentication mechanisms between portal system and grid service by using symmetric key. It will improve a security level in UI layer as much as in grid service.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.38B no.3
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• pp.190-198
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• 2013

Since the facilities for the remote users tend to be deployed in distributed manner, authentication schemes for multi-server communication settings, which provide various web services, are required for real-world applications. A typical way to authenticate a remote user relies on password authentication mostly. However, this method is vulnerable to attacks and inconvenient as the system requires users to maintain different identities and corresponding passwords. On the other hand, the user can make use of a single password for all servers, but she may be exposed to variants of malicious attacks. In this paper, we propose an efficient and secure authentication scheme based on a brokered authentication along with smart-cards in multi-server environment. Further we show that our scheme is secure against possible attacks and analyze its performance with respect to communication and computational cost.

• The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY
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• v.11 no.2
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• pp.92-96
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• 2006

NLPCA(Nonlinear Principal Component Analysis) is a novel technique for multivariate data analysis, similar to the well-known method of principal component analysis. NLPCA operates by a feedforward neural network called AANN(Auto Associative Neural Network) which performs the identity mapping. In this work, a sensor fault detection system based on NLPCA is presented. To verify its applicability, simulation study on the data supplied from risk management system is executed.

• Journal of Fashion Business
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• v.15 no.6
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• pp.113-133
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• 2011

The purpose of this study is to establish academic identity as well as produce human resources that industries need by grasping curriculum of the departments related beauty focusing on Korean colleges (junior colleges and four year course colleges), analyzing examples of advanced countries and suggesting their developmental direction. For the research method, the reference period of curriculum in Korean colleges was from Jul. 05th, 2011 to Aug. 05th, 2011. the investigation method is as follow: first, the curriculum of the departments related to beauty which were registered in the web sites were investigated. Second, the documents were received by fax and Email from each department after calling it. Third, questions and answers were done in reference to majors on the phones. these methods are intended for 65 junior colleges and 16 four year course colleges (total 81 ones). It clarified that lifelong education centers and the graduate courses were ruled out. the statistical analysis about data which were investigated like this were done by the frequency analysis. The results which examined the major subjects of Make-up focusing on Korea and foreign countries are as follow: First, the result which examined the major and theory subjects of Make-up has found that there are the human body theory, the equipment theory, the marketing theory are the management theory in Korean junior colleges and physiology/chemical, management, marketing and equipment product were treated in four year course colleges of Korea. As for foreign colleges, the subjects related to history and culture are mainly treated as the theory courses and their purpose is to cultivate basic knowledge of the fields which are mainly connected to Make-up including plays, movies, TV and studios. Second, the result which examined practice subjects of Make-up major has found that practice subjects of the total ones are of great importance in junior colleges. And it could be found that the Make-up field is of little importance as it is not independent and exists with the hair and skin fields in one department in the four year course colleges. Especially, in the foreign countries, the more detailed and professional subjects including classes which treat digital media, studio technologies, production, wigs and the special effects were treated by the field class system and these characteristics implies that Korean curriculum should be changed in the future. Based on this analytical results of investigation, this researcher tried to propose the developmental direction of Korean curriculum in the future.