• KSII Transactions on Internet and Information Systems (TIIS)
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• v.11 no.5
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• pp.2792-2810
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• 2017

Forward-secure signature is a specific type of signature, which can mitigate the damage caused by the signing key exposure. Most of the existing forward-secure (identity-based) signature schemes can update users' secret keys at each time period, achieve the existential unforgeability, and resist against classical computer attacks. In this paper, we first revisit the framework of forward-secure identity-based signatures, and aim at supporting flexible key update at multi time period. Then we propose a post-quantum forward-secure identity-based signature scheme from lattices and use the basis delegation technique to provide flexible key update. Finally, we prove that the proposed scheme is strongly unforgeable under the short integer solution (SIS) hardness assumption in the random oracle model.

• Journal of Korea Society of Industrial Information Systems
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• v.6 no.4
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• pp.30-38
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• 2001

An enterprise resource planning (ERP) system is an enterprise wide management system made possible by information technology. Organizations have been implementing ERP packages for integrating the business process in various functions. ERP has been helping companies to automate their entire business processes within the organization as a whole instead of just in some functional units. This paper presents five case studies indicating that enterprise resource planning (ERP) systems do enhance the performance of manufacturing organizations. The ERP systems studied are from SAP, Baan, and Oracle. In all five cases, better cross-functional integration was a critical success factor.

• Journal of Korean Association for Spatial Structures
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• v.1 no.1 s.1
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• pp.135-142
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• 2001

This paper proposes structural analysis on the World Wide Web to form a part of the architectural design project. It purposes modeling space frames and a structural analysis program on the internet only by inputting basic data for forming a shape in the whole phase of space frame analysis. The analysis data is conducted by Oracle DBMS(DataBase Management System), GUI(Graphic User Internet) by Java Applet and connection with server and database by Java Servlet respectively. The result from modeling and analysis is provided as graphic and text file forms by web browsers. Programs can be executed irrespective of user's OS by using internet and highly-secured system is constructed taking advantage of Java. Of great efficiency is maintaining and recycling data as the whole is dealt by database from the beginning to the end of program.

• Publications of The Korean Astronomical Society
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• v.24 no.1
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• pp.83-91
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• 2009

We have designed data processing server system to include data archiving, photometric processing and light curve analysis for KMTNet (Korea Microlensing Telescope Network). Outputs of each process are reported to the main photometric database, which manages the whole processing steps and archives the photometric results. The database is developed using ORACLE 11g Release 2 engine. It allows to select objects applying any set of criteria such as RA/DEC coordinate and Star ID, etc. We tested the performance of the database using the OGLE photometric data. The searching time for querying 70,000,000 records was under 1 second. The database is fully accessed using query forms via web page.

• Proceedings of the KIEE Conference
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• 2001.11b
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• pp.371-373
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• 2001

In this paper, we present 2-step load cycle for daily load curve of up to and including 100kVA distribution transformer in domestic. Daily load patterns are classified by two methods dependent upon possession information. In case we possess daily load profiles make use of K-mean algorithm and in case we have not daily load profiles, make use of customer information of KEPCO. As the parameters of the load pattern classification, we use are daily load profiles and customer information of each distribution transformers. Data management system is used for NT oracle. We can present peak load magnitude, initial load magnitude and peak load duration for daily load patterns by 2-step load cycle for daily load curve of up to and including 100kVA distribution transformer in domestic. We think that this paper contributes to enhancing the distribution transformer overload criterion.

• Journal of the Korea Safety Management & Science
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• v.5 no.2
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• pp.87-98
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• 2003

With the development of CNC(Computer Numerical Control) and communication technology, the connotation and functions of Distributed Numerical Control have been greatly enlarged. In this study, we develop and implement a Distributed Numerical Control system that has real time and multi-tasking operation capability for the machining cell with various NC(Numerical Control) and CNC machines. With the consideration of economy, generalization and extension, this system is interfaced with Shop Floor Control System, Machine Control System and Tool Preparation System using advanced networking method. In the implementation phase, we use the ORACLE DBMS (Database Management System) as the DBMS and Microsoft Visual C++ as the programming tools.

• Proceedings of the Korea Information Processing Society Conference
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• 2002.04a
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• pp.167-170
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• 2002

인터넷의 발달과 함께 웹 기반의 멀티미디어 컨텐츠들도 많은 발전을 하게 되었다. 기존의 텍스트 형식만을 지원하던 많은 시스템들이 멀티미디어 기능을 추가하게 됨으로 보고, 듣고, 말하는 복합기능이 요구되었다. 또한 컴퓨터와 전화를 연결하여 데이터베이스 응용의 부가가치를 향상시키는 CTI 기술의 마른 성장은 다양한 분야로 확산되어 가고 있다. 본 논문에서 이러한 기술의 통합을 시도하여, Oracle8i DB를 공유한 Linux기반의 CTI프로그램과 Window기반의 ActiveX 모듈을 연동한 전화 음성게시판(Voice-BBS)을 설계 및 구현하였다. 제안한 시스템은 PSTN 상에서 뿐만이 아니라 웹상에서도 음성 데이터를 저장하고 재생할 수 있도록 설계되었다.

• Asia pacific journal of information systems
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• v.8 no.2
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• pp.19-35
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• 1998

There has been a complaint that current editorial and refereeing system of the traditional journal systems has something to be desired due to long time lag between submission and publication, improper(unfair in some sense, because no communication is allowed between reviewers and authors) review of submitted papers sometimes, and so on. This paper introduces a Web-Based Paper Review Support System, called WebReview, The system helps to reduce the time lag and allows reviewers and authors to communicate anonymously to clarify the research results, if there is any ambiguity. WebReview is implemented in Java, using Oracle as an underlying DBMS, to capture interactions between users and the system.

• Journal of Communications and Networks
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• v.15 no.3
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• pp.252-257
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• 2013

To alleviate the damage caused by key exposures, Dodis et al. introduced the notion of key-insulated security where secret keys are periodically updated by using a physically insulated helper key. To decrease the risk of helper key exposures, Hanaoka et al. advocated parallel key-insulated mechanism where distinct helpers are independently used in key updates. In this paper, we propose the first parallel key-insulated signature scheme which is provably secure without resorting to the random oracle methodology. Our scheme not only allows frequent key updating, but also does not increase the risk of helper key exposures.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.10 no.3
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• pp.27-33
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• 2010

One of the most critical success factor in introducing and operating an integrated information system is the performance management. In this study, we propose some SQL tuning techniques, applicable to optimize the performance of relational database systems. We showed effectiveness of the techniques by applying to a database system of a medium scale company.