• Proceedings of the Korea Information Processing Society Conference
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• 2023.05a
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• pp.277-278
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• 2023

Smart contract는 Off-chain 데이터를 On-chain에서 조회해보지 못하는 "Blockchain Oracle Problem"을 갖고 있다. Oracle Problem을 적용할 때 실제 사용자 측면에서 어떠한 비용이 발생하는지 연구가 부족하다고 느껴, Chainlink 오라클 아키텍처 기반 시스템의 On-chain 비용을 측정할 수 있는 식을 제안한다. 그 결과 각 아키텍처마다 gas fee, oracle fee, latency의 차이를 확인한다.

• Korea Logistics Conference
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• v.10 no.3
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• pp.223-240
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• 2002

• Proceedings of the IEEK Conference
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• 2000.06c
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• pp.71-74
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• 2000

New methods for storing and retrieving semi-structured data such XML documents has been recently studied. In this paper, we concern querying of XML data stored in relational tables. We first describe a method of querying XML documents using Oracle XDK, especially XSQL Servlet. We then apply the method to XML documents describing book information.

• Proceedings of the Korea Information Processing Society Conference
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• 2004.11a
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• pp.733-736
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• 2004

본 논문에서는 Oracle과 JSP(Java Stored Procedure)를 이용하여 생산공정 및 실적현황을 보고하고 작업지시가 가능한 온라인 시스템을 개발하였다. 현장과 사무실을 위한 정보전달매체로 LED 전광판을 활용하였다. 기존 전광판을 이용한 시스템에서는 고정된 형식의 정보만을 제공하였으나, 본 논문에서 구축한 시스템은 실시간으로 정보의 내용과 형식을 수정할 수 있다. 이 시스템은 RS6000상에서 Oracle9i와 자바로 개발되었고, 각 전광판과 생산라인에 설치된 조작대는 TCP/IP로 통신한다. 이를 통해 공정감시 및 실적현황 보고를 DBMS에서 통합 관리하며 실시간으로 작업자와 관리자에게 정보를 제공한다.

• Convergence Security Journal
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• v.20 no.2
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• pp.69-76
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• 2020

Blockchain 2.0 supports programmable smart contract for the various distributed application. However, the environment of running smart contract is limited in the blockchain, so the smart contract only get the deterministic information, such as block height, block hash, and so on. Therefore, some applications, which requires random information, such as lottery or batting, should use oracle service that supply the information outside of blockchain. This paper develops a random number generator oracle service. The random number generator oracle service use irregular big data as entropy source. This paper tests the randomness of bits sequence generated from oracle service using NIST SP800-22. This paper also describes the advantages of irregular big data in our model in perspective of cost comparing hardware entropy source.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.39C no.8
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• pp.716-721
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• 2014

This paper proposes how to prevent of vulnerability from IP address attack of Oracle DB by C program environments. An attacker may try to login DB by connectng remote IP address. Recently an attacker use foreign IP address and try to connect to DB using known DB account. Therefore, DB data is frequently disclosed. I propose a new idea that develops specific IP address blocking module in C program in the Oracle DB. By this module, we can use the Oracle DB safely.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.17 no.3
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• pp.35-42
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• 2007

We describe the problem of reducing the key material in the Even-Mansour cipher without security degradation. Even and Mansour proposed a block cipher based on XORing secret key material just prior to and after applying random oracle permutation P such that $C=k_2\bigoplus P(M\bigoplus k_1)$. Recently, Gentry and Ramzan showed that this scheme in the random permutation oracle can be replaced by the four-round Feistel network construction in the random function oracle and also proved that their scheme is super-pseudorandom. In this paper we reduce the key size from 2n to n, which is the optimal key size of Even-Mansour cipher in the random function oracle model and also give almost the same level of security.

• Proceedings of the Korea Society for Industrial Systems Conference
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• 1999.12a
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• pp.41-54
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• 1999

• Journal of the Korea Society for Simulation
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• v.17 no.3
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• pp.53-62
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• 2008

This paper proposes a new implementational model based on the security model of Oracle for Web ontology. Recently, several access control models using relational database security model for access control to Web ontology have been developing, and one of the most representative access control model is the RAC model. However, the RAC model is based on the standard security model, and thus it does not provide a implementational model for practical relational database management systems. In this paper, we propose an implementational model based on Oracle which is widely used and providing various security policies. This paper shows the implementation and experimental evaluation. Especially, the proposed model uses the VPD security model of Oracle and support high application and usability.

• Proceedings of the Korea Multimedia Society Conference
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• 2000.04a
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• pp.324-327
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• 2000

XML은 웹 상에서 데이터의 원활한 교환을 위해서 HTML을 보완하여 설계된 차세대 인터넷문서작성용언어이다. XML 문서와 같은 반구조(semistructured) 의 특성을 갖는 데이터를 효과적으로 다루기 위한 새로운 데이터모델과 질의어가 제안되어 오고 있지만, 여기서는 관계형 데이터베이스에 XML 문서를 효과적으로 저장하는 방법에 관해서 논의한다. 먼저, 도서를 표현하는 XML 문서를 위한 DTD를 제시하고, 이 DTD를 관계 테이블로 변환하는 방법을 논의한다. 다음에는 Oracle서 지원하는 XDK를 이용하여 XML문서를 Oracle8i DB에 저장하는 방법에 대해서 논의한다.