• 한국전자거래학회:학술대회논문집
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• 한국전자거래학회 2001년도 International Conference CALS/EC KOREA
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• pp.369-378
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• 2001

Recently, according to the rapid development of Internet and IT, many applications and technologies related to Internet and IT have been studied and developed. The agent technology, which was an essential topic in early AI, is being researched with the combination of the recent network technologies. Mobile agent especially takes high interest of many researchers because of its mobility with which it can move around the internet and complete its goal. This paper presents a virtual market system using mobile agent, in which the transaction agents can do their transaction about some product with each other instead of real buyer and seller. The presented virtual market system consists of market agent, customer agent and database agent to provide the virtual market places for the effective completion of transactions.

• 한국시뮬레이션학회논문지
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• 제12권2호
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• pp.55-62
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• 2003

The explosive Increase of wireless networks and the advancement of mobile devices lead to the expansion of mobile environment. In accordance with the development of mobile environment, the need to use mobile database is increased sharply, and also it accompanies the related problems. The current mobile database system is based on the centralized method from which a synchronized server manages multiple mobile database management system to synchronize. From this mobile system architecture, several kinds of problems can be detected such as the management of synchronization issues between mobile databases and the transaction management issues. Furthermore, the current mobile database management system does not consider any solution on the fault tolerance. To solve those problems, this paper proposes the mobile agent-based mobile database management system. The proposed system provide high confidence and efficiency by enhancing the network efficiency and fault tolerance through the mobile grouping.

• 인터넷정보학회논문지
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• 제6권1호
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• pp.65-72
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• 2005

플래시 메모리는 이동형 컴퓨팅 환경에서 휴대용 정보기기를 지원하는 우수한 미디어이다. 플래시 메모리는 비휘발성, 낮은 전력소모, 빠른 데이터 접근 속도 등의 특징으로 휴대용 정보기기용 데이터베이스의 핵심 저장 모듈이 되었다. 하지만, 일반 RAM 메모리에 비하여 상대적으로 느린 연산 특성을 고려하여 기존의 트랜잭션 처리 기법을 개선할 필요가 있다. 이를 위하여, 본 논문은 플래시인지 트랜잭션 관리(Flash-Aware Transaction Management: FATM) 기법을 제안한다. FATM은 SRAM과 W-cache를 활용하여 트랜잭션 처리 성능을 높인다. 또한, 성능 검증을 위하여 시뮬레이션 모델을 제안하였으며, 실험 결과 분석을 통하여 FATM이 기존의 트랜잭션 처리 기법보다 우수함을 확인하였다.

• 한국경영정보학회:학술대회논문집
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• 한국경영정보학회 2007년도 International Conference
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• pp.646-651
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• 2007

Secure digital payment is critical in the successful shaping of global digital business. Digital payments are increasingly being used as a substitute to traditional payments, contributing markedly to the efficiency of the economy. The focus of every digital business transaction is to minimize risks arising from transactions. It is essential to ensure the security of digital payment whether used in internal networks or over wireless Internet. This paper analyses secure digital payment methods from the viewpoint of systemic security and transaction security. According to comparative analysis of digital payment models, this paper proposes a comparative analysis framework to investigate and evaluate secure digital payment. In conclusion, the comparative analysis framework, comparison of digital payment models and mobile payment models proposes a useful academic and practical foundation to enhance the understanding of secure digital payment methods. It also provides academic background and practical guidelines for the development of secure digital payment systems.

• International Journal of Internet, Broadcasting and Communication
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• 제12권2호
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• pp.144-149
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• 2020

A database called Home Location Register(HLR) plays a major role in location management in mobile cellular networks. The objectives of this paper are to identify the problems of the current HLR system through rigorous analysis, to suggest solutions to them. The current HLR backup method is a process of simply writing the changed memory SLD block to disk, which has a problem in maintaining database consistency. Since information change and backup are performed separately by separate processes, there is a risk of information inconsistency when an error restart occurs. To solve this problem, a transaction concept was introduced for subscriber-related operation functions and a recovery method through logging and checkpointing was introduced. The subscriber related functions of tasks terminated normally by the suggested process are recovered with consistency even after system restarts. Performance is also not affected seriously because disk tasks for log occur with only subscriber related functions.

• 경영정보학연구
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• 제10권2호
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• pp.309-327
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• 2008

이 연구는 한국에 위치한 어느 공항의 프로젝트를 수행하는 가운데 도출된 결과다. IT 솔루션들을 놓고 검토한 결과, 레거시 정보시스템을 흡수하며 동시에 안전 수준을 향상시키는 시스템을 구축하기 위해서, PCS에 기반을 둔 모바일 데이터베이스 도입을 고려하면서 동반되는 물리적인 제약과 기술적인 문제들을 검토하고, 모바일 환경에서의 트랜잭션을 처리해 주는 두 가지 선택에 대하여 비교한다. 현재까지 알려진 문헌연구와 시뮬레이션 스터디를 통해서 이들 기술을 비교한 다음, 트랜잭션 프로세싱코디네이터 마이그레이션에 대한 방법을 제시하며, 기술이 가진 한계를 현실적 환경에서 검토해 본다.

• 한국산학기술학회논문지
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• 제14권7호
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• pp.3487-3494
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• 2013

최근 NFC 기술을 탑재한 스마트 기기를 이용하여 모바일 지급결제, 출입통제, 스마트 포스터와 같이 정보 제공 또는 광고에 관련된 응용 서비스가 제공되고 있다. 이에 따라 NFC 기술과 더불어 스마트 기기 시장은 더욱더 성장할 것으로 전망된다. 특히, 모바일 지급결제 서비스가 국내 외에서 더 활성화될 것으로 예상되고 있으며, 2012년 3월에는 모바일 지급결제를 위한 표준인 KS X 6928이 제정되었다. 모바일 지급결제 시스템은 사용자에게 편의성을 제공하지만 거래 정보를 전송하는 과정에서 데이터가 노출되는 등 다양한 보안 위협이 발생할 수 있기 때문에 인가되지 않은 제 3자에게 전송되는 데이터가 노출되지 않도록 암호화를 수행하는 것이 반드시 요구된다. 따라서 본 논문에서는 KS X 6928의 대면 거래와 비대면 거래에서 데이터를 암호화하는데 사용하는 세션키 생성 방식의 문제점을 분석하고 안전성을 향상시킬 수 있는 안전한 모바일 지급결제 시스템을 제안한다.

• 한국컴퓨터정보학회논문지
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• 제24권4호
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• pp.65-71
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• 2019

IAs smart device penetration rate is more than 90%, mobile transaction ratio using smart device is increasing. Smart contracts are used in various areas of real life including smart trading. By applying smart contracts to the platform for smart transactions through block-chain technology, the threat of hacking or forgery can be reduced. However, various threats to devices in smart transactions can pose a threat to the use of block chain Etherium, an important element in privilege and personal information management. Smart contract used in block chain Ethereum includes important information or transaction details of users. Therefore, in case of an attack of privilege elevation, it is very likely to exploit transaction details or forge or tamper with personal information inquiry. In this paper, we propose a detection and countermeasure method for privilege escalation attack, which is especially important for block chain for secure smart transaction using block chain Ethereum. When comparing the results of this study with the results of similar applications and researches, we showed about 12~13% improvement in performance and suggested the future countermeasures through packet analysis.

• 디지털산업정보학회논문지
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• 제6권4호
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• pp.131-142
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• 2010

Due to the development of the Internet, Internet banking that we are liberated from time and space has evolved into banking system. So modern life became comfortable. However, Dysfunction (malicious Information leakage and hacking etc.) of the Internet development has become a serious social problem. According to this, The need for security is rapidly growing. In this paper, we proposed the Internet Banking Authentication System using a dual-channel in OTP(One Time Password) authentication. This technology is that A user transfer transaction information to Bank through one Internet channel then bank transfer transaction information to user using the registered mobile phone or smart phone. If user confirm transaction information then bank request user's OTP value. User create OTP value and transfer to bank and bank authenticate them throgth the ARS. If authentication is pass then transaction permitted. Security assessment that the proposed system, the security requirement that the confidentiality and integrity, authentication, repudiation of all of the features provide a key length is longer than the current Internet banking systems, such as using encryption, the security provided by the Financial Supervisory Service Level 1 rating can be applied to more than confirmed.

• Journal of Information Technology Applications and Management
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• 제12권3호
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• pp.97-109
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• 2005

The internet and wireless communication technologies are creating ubiquitous environments in which various services are expected anytime and anywhere. Many hardware facilities have been developed and system structures are suggested for mobile services to realize a ubiquitous computing environment with appropriate quality. But these applications are not designed in the consideration of the general capabilities to perform user's wireless and mobile communication/transaction. Consequently, different needs from users are not sufficiently satisfied yet. In this study, we suggest structure of the emerging network system for mobile commerce that provides users with seamless and ubiquitous environments using location information which exploit context-aware technology.