• Korean Journal of Computational Design and Engineering
• /
• v.13 no.4
• /
• pp.286-295
• /
• 2008

Construction industry, which is a composite industry being performed by organic combination of various tasks, gives birth to a various of information in the stages of planning, designing, and maintenance management. In particular, the drawing information is broad in the scope of use because it contains all information about buildings as wall as bid, materials, contracts. Therefore, the management of drawing information security is one of the most important factors, which determines the success of failure of business. The major findings and result of this study are as follows to control the distributed drawing information in the collaboration environment. 1) Analysis for function and practical use of DRM in the construction industry. 2) Proposal for applications of DRM that can secure IFC model-based drawing information in the collaboration environment. 3) Extraction from additional IFC entities to apply DRM to part 21 physical files 4) Analysis for functions which are necessary in DRM application prototype system and development of the system. 5) Development IFC model-based DRM prototype system.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.12 no.3
• /
• pp.478-484
• /
• 2008

When a mobile node moves, MIPv6 operates an authentication process for the new connection. These kinds of frequent binding update and authentication processes cause much traffic and delay the service. To solve this problem, PMIPv6 provides a network-based mobility protocol in order to lessen the load on a mobile node. However, when it is moved from a domain to a domain or in a domain, there still lies a need fDr a new address, so MIPv6's demerit still exists. In IPsec, too, a new negotiation should be made when it is moved to WAN(Wide Area Network). This causes load to the mobile node. In this paper suggests MBB(Make Before Break) system to eliminate disconnections or delays resulted from the address change or renegotiation for security. When the mobile node receives a CoA address, IPsec negotiation gets operated. Its identity is authenticated by sending the identifier used for the prior negotiation to CN(Correspondent Node) through the BID message suggested. After that, negotiation Bets simplified that disconnections can be eliminated, and in the IPsec negotiation, the load on the mobile node can be lessened as well; moreover, two addresses are used for the communication simultaneously, so the probability of packet loss can be reduced.

• The Transactions of the Korea Information Processing Society
• /
• v.6 no.11
• /
• pp.2863-2874
• /
• 1999

Apartment auction is a system that is used for the citizens to get a house. This paper deals with the implementation of a web-based intelligent decision support system using OLAP technique and data mining technique for auction decision support. The implemented decision support system is working on a real auction database and is mainly composed of OLAP Knowledge Extractor based on data warehouse and Auction Data Miner based on data mining methodology. OLAP Knowledge Extractor extracts required knowledge and visualizes it from auction database. The OLAP technique uses fact, dimension, and hierarchies to provide the result of data analysis by menas of roll-up, drill-down, slicing, dicing, and pivoting. Auction Data Miner predicts a successful bid price by means of applying classification to auction database. The Miner is based on the lazy model-based classification algorithm and applies the concepts such as decision fields, dynamic domain information, and field weighted function to this algorithm and applies the concepts such as decision fields, dynamic domain information, and field weighted function to this algorithm to reflect the characteristics of auction database.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2006.05a
• /
• pp.373-376
• /
• 2006

컴퓨터와 인터넷의 발전은 사용자들로 하여금 많은 정보들은 손쉽고 빠르게 접할 수 있는 기회를 제공한다. 이로 인해 사용자들의 정보 수집 및 활용의 수준 또한 높아져 방대한 분량의 정보가 이용되고 있으며, 원하는 정보를 얻는데 많은 시간이 소비되고 있다. 따라서 사용자들은 신속하고 정확하게 필요한 정보만을 요구하게 된다. 입찰정보도 그 대표적인 예로 볼 수 있는데 간단한 입찰정보의 제공만이 아닌 입찰정보의 분석과 결과물을 고객의 특성에 맞게 서비스를 제공해줌으로써 e-CRM 개념의 고객 맞춤형 입찰정보 형태로 변해가고 있다. 본 논문에서는 입찰정보를 사용하는 고객들의 특성을 입찰 성향에 근거하여 조사하고 결과를 토대로 입찰정보를 분석한다. 이를 토대로 고객들에게 신속하고 정확한 입찰정보를 제공해주기 위한 여러 기법들을 통합하여 최적의 입찰정보를 제공하는 시스템을 구현하고자 한다.

• The Journal of Information Systems
• /
• v.10 no.1
• /
• pp.127-146
• /
• 2001

The area of business applications in the internet are extended enormously in result of fast development of computing and communication technologies, increase of internet use, and use of intranet/extranet in enterprise information system. Widely spread the use of the internet, there are various applications for Business to Business (B to B) or Business to Customer(B to C) model that are based on the intranet or extranet. This paper designed and implemented the Web-based Electronic Bidding System for Business to Business (B to B) model. The technical issues of electronic bidding system in the internet are involved in the connection between web client and server, electronic data interchange for the contract document, and security solution during the bidding and contracting processes. The web-based electronic bidding system in this paper is implemented using Java applet and servlet as a connection interface for web client and server, XML/EDI-based documents for a bid and a contract, and bidding server and notary server for enhancing the security using PKI(Public Key Infrastructure)-based public key cryptography, digital signature and Certification Authority(CA).

• The Korean Journal of Financial Studies
• /
• v.2 no.2
• /
• pp.221-256
• /
• 1995

This paper compares the intra-day patterns on the NYSE and AMEX of volatility, trading volume and bid-ask spreads for European and Japanese dually-listed stocks with American stocks of comparable average trading volume and volatility. It is shown that the intra-day patterns for these stocks are remarkably similar even though public information flows differ markedly across these stocks during the trading day. In the early morning, all stocks have higher volatility than later in the day, but this phenomenon is most pronounced for Japanese stocks and affects American stocks the least. We argue that these patterns are consistent with markets reacting to the overnight accumulation of public information but are inconsistent with the view that early morning volatility can be attributed to monopolistic specialist behavior.

• KDI Journal of Economic Policy
• /
• v.34 no.1
• /
• pp.135-168
• /
• 2012

This study analyzes ways to detect protest responses (hereafter, PR zero-bid) in the contingent valuation method (CVM). In order to distinguish PR zero-bids from true zero-bids (non-PR zero bids), this study adopts the concept of the implicit willingness to pay employing the Hicksian compensating surplus and the Taylor's 1st order approximation. When a respondent proposes a zero-bid (i.e., WTP=0) and chooses a PR filtering item to indicate that her implicit WTP is not necessary zero, her response is identified as a PR zero bid. PR filtering items falling into the PR zero bids category include the uncertainty of information, distrust in the government and project achievement, disagreement to project plans, discontent with the fairness of public works and their payment method and animosity against the CVM itself. The empirical analysis shows that PR zero bids take place systematically in particular respondent groups: respondents who have never used similar facilities before nor plans to use the facility provided by the public project, the employed, and low income groups. In conclusion, the study suggests that a CVM questionnaire needs to be designed carefully to minimize problems associated with PR zero bids and the potential risks of having sample selection bias should be concerned.

• Proceedings of the Korean Information Science Society Conference
• /
• 1999.10b
• /
• pp.87-89
• /
• 1999

웹 상에서 인터넷 경매시스템은 일반적인 경매처럼 상품을 제시하고 그 상품에 대해 경매 입찰자가 입찰(bid)을 제시함으로 해서 최종적으로 경매 시간 내에 가장 높은 입찰을 제시하는 경매 입찰자에게 상품이 낙찰되는 형식이 사용되고 있다. 하지만 사용자 인터페이스 부분에 있어서 편리성을 고려하지 않을 뿐만 아니라 경매 참여자에게 지속적인 입찰제와 확인 등의 여러 가지의 사용자 행위를 요구함으로 인해 전자상거래의 고객 편의를 위한 One-step processing을 만족시키지 못하고 있다. 미시건 대학의 AuctionBot 시스템은 미국의 대표적인 인터넷 경매 시스템으로 여러 형태의 경매를 수용할 수 있다는 면에서 장점을 가지고 있지만 사용자를 위한 지능적인 에이전트를 이용한 사용자 인터페이스 부분은 거의 고려하지 않은 시스템이므로 사용자의 편의성 면에서 단점을 가지고 있다. 따라서 본 논문은 지능적 에이전트를 이용해 사용자가 상품 정보를 경매 서버로 보내면 에이전트가 자동적으로 사용자를 위해 모든 처리를 해주는 경매 시스템을 구현하여 기존에 사용되었던 일반적인 경매 시스템의 단점을 보완하여 효율적인 입찰 가격 정책을 이용한 경매 시스템을 구현하고자 한다.

• Asia pacific journal of information systems
• /
• v.13 no.4
• /
• pp.29-47
• /
• 2003

This research explores early mover advantages and performance in the cyber market based on an empirical test. It also examines whether early mover strategic capabilities are able to adopt mutually cumulative relationship in the cyber market. Early movers such as eBay.com and Amazon.com seem to have been able to defy exclusive relationship between strategic capabilities. Compared with their followers such as uBid.com and buy.com, they have been able to adopt strong focus, differentiation, and cost leadership strategies. The purpose of this paper is to investigate the differences in strategic choices based on the strategic capabilities and performance of online firms between early movers and followers. The study reviews early mover advantages and disadvantages, and a strategic typology based on Porter's model, as well as strategic capabilities based on the sand cone model.

• Proceedings of the Korea Inteligent Information System Society Conference
• /
• 2001.01a
• /
• pp.16-22
• /
• 2001

There is no doubt that agents play an increasingly predominant role in e-commerce, whether these are business-to-consumer or business-to-business applications. However most of the current e-commerce agents only support a single bid for a product at a fixed price. Although price is an important factor, it is not the only concern of both business and consumer. There is doubt as to whether such agents satisfv both parties. Negotiation on a variety of issues is needed in order to reach an agreement. In this paper, a computational agent negotiation(CAN) model is proposed to facilitate multiple-issue negotiation via an agent. The main contribution of the CAN model is it enables agent to participate actively in the negotiation with various feedback instead of simply an agreement or rejection.