• 한국정보시스템학회지:정보시스템연구
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• 제11권1호
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• pp.175-198
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• 2002

This paper is to develop a security module for electronic approval systems. Electronic documents are created, transmitted and saved in the company's intranet computer network. Transmitting electronic documents, however, brings us a security problem. Communications among various computer systems are exposed to many security threats. Those threats are eavesdropping, repudiation, replay back etc. The main purpose of this paper is to develop a module which provides the security of electronic documents while they are passed from one place to another This paper applies Multi-Level security to the electronic approval system that guarantees security of electronic documents from many threats. Multi-Level security controls the access to the documents by granting security level to subject users and object electronic documents. To prevent possible replay back attacks, this paper also uses one time password to the system. The security module is composed of client program and server one. The module was developed using Microsoft Visual Basic 6.0 and Microsoft SQL Server 7.0. The code uses Richard Bondi's WCCO(Wiley CryptoAPI COM Objects) library functions which enables Visual Basic to access Microsoft CryptoAPI.

• Communications for Statistical Applications and Methods
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• 제11권2호
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• pp.329-343
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• 2004

With advancement of computer and network, world wide web(WWW) as a medium of information communication is generalized in many fields. In educational aspect, applications of WWW as alternative media for class teachings or printed matters are increasing. In this article, we demonstrate a web-based electronic text on the 'probability and statistics' which is one of six fields of mathematics in the 7th curriculum. This text places importance on comprehension of concepts of probability and statistics as an applied science.

• Journal of Communications and Networks
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• 제7권1호
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• pp.45-53
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• 2005

In this paper, we present a cross-layer analysis of wireless TCP systems over correlated channels. The effects of error correlation on the behavior of link retransmission strategy and the end-to-end throughput of TCP layer are investigated. Based on the cross-layer analysis, an efficient refinement of link layer protocol is proposed by consciously utilizing the information of channel correlations, which leads to the performance improvement of wireless TCP systems.

• 한국통신학회:학술대회논문집
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• 한국통신학회 2004년도 추계종합학술대회 논문 초록집
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• pp.105-105
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• 2004

• 한국중재학회지:중재연구
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• 제21권2호
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• pp.47-64
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• 2011

The China International Economic and Trade Arbitration Commission(CIETAC) released online arbitration rules which apply the resolution of disputes over electronic commerce transactions, as well as other economic and trade disputes in which the parties agree to do. The evidence submitted by the parties may be electronic evidence created, sent, received or stored by electronic, optical or magnetic means. Electronic evidence with a reliable electronic signature shall carry the same effect and probative force as a document with a hand-written signature. Where a case is tried in a tribunal, the arbitration tribunal shall conduct an online trial hearing using internet video conference or other electronic or computer communication means. Unless the parties have another agreement, summary procedure shall apply to cases where the amount in dispute exceeds RMB 100,000 but no more than RMB 1 million, or where the amount in dispute exceeds RMB 1 million and a party submits a written application for summary procedure after obtaining the written consent of the other party. Unless the parties have agreed otherwise, fast-track procedure shall apply to cases where the amount in dispute does not exceed RMB 100,000 or where the amount in dispute exceeds RMB 100,000 and a party submits a written application for fast-track procedure after obtaining the written consent of the other party. Notable features of the Online Rules are as follows; first, there is not detailed consideration for online arbitration. Second, communications between the parties and the tribunal are allowed only through the Secretariat. Third, elaborate provisions regarding the electronic submission and transmission of documents is provided for. Forth, various factors must be considered by the tribunal in deciding the evidence's reliability. Fifth, reasonable endeavours is levied on CIETAC to keep data communications secure and encrypted. Sixth, the tribunal has the right to investigate and collect relevant evidence. And finally different procedures are provided for in consideration of the various types of E-commerce.

• 정보학연구
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• 제8권4호
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• pp.119-140
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• 2005

The purpose of this article is to study on the electronic bill of lading in the electronic trade era. The term 'electronic trade' means all or part of any such trade as implemented by means of apparatus having the information processing capability, such as a computer, and networks of information and communications. The introduction of an electronic bill of lading has long been considered essential by the members of the international trading community as a key means of reducing its costly reliance on paper.

• 무역상무연구
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• 제13권
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• pp.215-233
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• 2000

We know there are tremendous increasing of electronic commerce transaction but don't have efficient method to cover the risk of it. Even though the risk why we make a deal by electronic commerce. The reason, I think, is its conveniences of little cost and by no means of papers or tele-communications. When the valid contracts are achieved you may have some problems because of different legal systems of the world. If the contractual quarrels break it is very difficult to solve it. So it is important to choose the governing law to avoid troubles when you make the contract on internet electronic commerce. The purpose of this study is to review the general principles of contract of internet electronic commerce.

• Journal of Communications and Networks
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• 제4권2호
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• pp.81-89
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• 2002

In this paper, we design and implement an efficient fair off-line electronic cash system based on Elliptic Curve Discrete Logarithm Problem (ECDLP), in which the anonymity of coins is revocable by a trustee in case of dispute. To achieve this, we employ the Petersen and Poupard s electronic cash system [1] and extend it by using an elliptic curve over the finite field GF($2^n$). This naturally reduces message size by 85% compared with the original scheme and makes a smart card to store coins easily. Furthermore, we use the Baek et al. s provably secure public key encryption scheme [2] to improve the security of electronic cash system. As an extension, we propose a method to add atomicity into new electronic cash system. To the best of our knowledge, this is the first result to implement a fair off-line electronic cash system based on ECDLP with provable security.

• 한국정보처리학회논문지
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• 제7권5S호
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• pp.1638-1648
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• 2000

Electronic commerce using internet is rapidly increasing a method to introduce and sell goods. persons who buy products in electronic commerce prefer to make interactive communications by multi users about products rather than show product informations. Reserved interactive transaction system for electronic commerce is electronic commerce system that is able to make a real communication buyers and customers. In this paper, e intend to design and implement reserved interactive transaction system for electronic commerce. it is efficiently used in middle and samll transaction system and able to make similar applications to sell and negotiate products for commercial transaction.

• 대한전자공학회논문지TC
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• 제41권11호
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• pp.25-32
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• 2004

본 논문에서는 전력선통신에서 발생하는 잡음에 대해서 DSSS을 적용할 수 있는 가능성을 분석했다. 이 잡음은 4가지가 있는데, 이들 잡음을 분석하기 위해서 특성에 따라서 실제로 전력선에서 발생하는 잡음원을 만들었다. 이들 잡음모델을 대상으로 DSSS을 적용한 BPSK의 BER 성능을 DSSS을 적용하지 않는 BPSK의 경우와 비교해서 모의실험하고 분석했다. 그 결과, DSSS을 적용한 BPSK의 경우가 DSSS을 적용하지 않는 BPSK의 경우에 비해서 8 dB 개선되었음을 알 수 있었다.