• Title/Summary/Keyword: computer-based

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A Design and Implementation of Web-based Test System using Computer-adaptive Test Algorithm (컴퓨터 적응형 알고리즘을 이용한 웹기반 시험 시스템 설계 및 구축)

  • Cho, Sung Ho
    • The Journal of Korean Association of Computer Education
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    • v.7 no.6
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    • pp.69-76
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    • 2004
  • E-learning is the application of e-business technology and services to teaching and learning. It use of new multimedia technologies and Internet to improved the quality of learning by facilitating access to remote resources and services. In this paper, we show a web-based test system, which is carefully designed and implemented based on the real TOEFL CBT. The system consists of a contents delivery mechanism, computer-adaptive test algorithm, and review engine. In this papepr, we describe design and implementing issues of web-based test systems.

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An X-ray Image Panorama System Using Robust Feature Matching and Per ception-Based Image Enhancement

  • Wang, Weiwei;Gwun, Oubong
    • Journal of Korea Multimedia Society
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    • v.15 no.5
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    • pp.569-576
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    • 2012
  • This paper presents an x-ray medical image panorama system which can overcome the smallness of the images that exist on a source computer during remote medical processing. In the system, after the standard medical image format DICOM is converted to the PC standard image format, a MSR algorithm is used to enhance X-ray images of low quality. Then SURF and Multi-band blending are applied to generate a panoramic image. Also, this paper evaluates the proposed SURF based system through the average gray value error and image quality criterion with X-ray image data by comparing with a SIFT based system. The results show that the proposed system is superior to SIFT based system in image quality.

Transputer-based Pyramidal Parallel Array Computer(TPPAC) architecture (Prelimineary Version) (트랜스퓨터를 사용한 피라미드형 병렬 어레이 컴퓨터 (TPPAC) 구조)

  • Jeong, Chang-Sung;Jeong, Chul-Hwan
    • Proceedings of the KIEE Conference
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    • 1988.07a
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    • pp.647-650
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    • 1988
  • This paper proposes and sketches out a new parallel architecture of transputer-based pyramidal parallel array computer (TPPAC) used to process computationally intensive problems for geometric processing applications such as computer vision, image processing etc. It explores how efficiently the pyramid computer architecture is designed using transputer chips, and poses a new interconnection scheme for TPPAC without using additional transputers.

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A Study on the Efficient Management of Liberal Education for Improving Computer Literacy

  • Koo, GeumSeo;Sim, Gab-Sig
    • Journal of the Korea Society of Computer and Information
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    • v.22 no.11
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    • pp.143-149
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    • 2017
  • In this paper, we propose efficient management method of liberal education for improving computer literacy. We analyzed the actual conditions and factors affecting education and reflected the analysis results in education. The subject of the study is 'Practice Excel', and tested achievement based on computer literacy. In order to evaluate objectively, we conducted CBT(Computer Based Test) based on Computer Specialist in Spreadsheet & Database Level-2. Analysis of the questionnaire included the use of the popular statistical program, IBM SPSS 24 trial, and frequency, ANOVA, t-test, crossover analysis, and correlation. Evaluation results, An important factor influencing educational performance was active participation. It also proved to be very helpful for understanding excel functions & expression.

Development and Assessment of Web-Based Problem-Based Learning for Computer Subject in Middle School (중학교 컴퓨터 교과에서의 웹기반 PBL 수업의 실제 및 평가)

  • Tae, Won-Kyung;Kim, Min-Kyeong
    • The Journal of Korean Association of Computer Education
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    • v.9 no.4
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    • pp.1-14
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    • 2006
  • The purpose of the study was to investigate how to improve students' information literacy and problem solving abilities in the computer subject. A web-based problem-based learning (PBL) for computer subject for the 8th graders in middle school are designed and developed. In addition. the process of learners' problem solving on problems produced from PBL model was analysed 10 investigate the way how to evaluate learners' responses and products during two semester.

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Virus Detection Method based on Behavior Resource Tree

  • Zou, Mengsong;Han, Lansheng;Liu, Ming;Liu, Qiwen
    • Journal of Information Processing Systems
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    • v.7 no.1
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    • pp.173-186
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    • 2011
  • Due to the disadvantages of signature-based computer virus detection techniques, behavior-based detection methods have developed rapidly in recent years. However, current popular behavior-based detection methods only take API call sequences as program behavior features and the difference between API calls in the detection is not taken into consideration. This paper divides virus behaviors into separate function modules by introducing DLLs into detection. APIs in different modules have different importance. DLLs and APIs are both considered program calling resources. Based on the calling relationships between DLLs and APIs, program calling resources can be pictured as a tree named program behavior resource tree. Important block structures are selected from the tree as program behavior features. Finally, a virus detection model based on behavior the resource tree is proposed and verified by experiment which provides a helpful reference to virus detection.

The Design of an Election Protocol based on Mobile Ad-hoc Network Environment

  • Park, Sung-Hoon;Kim, Yeong-Mok;Yoo, Su-Chang
    • Journal of the Korea Society of Computer and Information
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    • v.21 no.8
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    • pp.41-48
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    • 2016
  • In this paper, we propose an election protocol based on mobile ad-hoc network. In distributed systems, a group of computer should continue to do cooperation in order to finish some jobs. In such a system, an election protocol is especially practical and important elements to provide processes in a group with a consistent common knowledge about the membership of the group. Whenever a membership change occurs, processes should agree on which of them should do to accomplish an unfinished job or begins a new job. The problem of electing a leader is very same with the agreeing common predicate in a distributed system such as the consensus problem. Based on the termination detection protocol that is traditional one in asynchronous distributed systems, we present the new election protocol in distributed systems that are based on MANET, i.e. mobile ad hoc network.

A Web-based Tool for Teaching Computer Programming

  • Cho, Sehyeong
    • Journal of Engineering Education Research
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    • v.17 no.4
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    • pp.58-61
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    • 2014
  • This paper introduces a tool for effective teaching of introductory computer programming. In order for the class to be effective, we try to attain attention, relevance, confidence, and satisfaction based on Keller's ARCS model. A web-based tool is developed to help both the students and the instructors.

Performance Analysis of Distribution-based and Replication-based Model for High Performance Grid Information Service

  • Quan, Cheng-Hao;Kim, Hie-Cheol;Lee, Kang-Woo;Lee, Yong-Doo
    • Proceedings of the IEEK Conference
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    • 2003.07d
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    • pp.1621-1624
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    • 2003
  • As the entities participating Grid become larger, performance requirement for the LDAP-based GIS(Grid Information Service) goes beyond that provided by a stand-alone single LDAP server. This entails the exploration of distributed LDAP systems. This paper presents the performance evaluation respectively for a distribution-based and a replication-based LDAP model. The analysis is based on an analytic performance model for each distributed system which is obtained by applying the M/M/1 queuing model. The performance evaluation made to these analytic models reveals that the distribution-based and the replication-based model show a significant tradeoff in their performance with respect to the system size as well as the amount of system load.

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Concealed Policy and Ciphertext Cryptography of Attributes with Keyword Searching for Searching and Filtering Encrypted Cloud Email

  • Alhumaidi, Hind;Alsuwat, Hatim
    • International Journal of Computer Science & Network Security
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    • v.22 no.6
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    • pp.212-222
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    • 2022
  • There has been a rapid increase in the use of cloud email services. As a result, email encryption has become more commonplace as concerns about cloud privacy and security grow. Nevertheless, this increase in usage is creating the challenge of how to effectively be searching and filtering the encrypted emails. They are popular technologies of solving the issue of the encrypted emails searching through searchable public key encryption. However, the problem of encrypted email filtering remains to be solved. As a new approach to finding and filtering encrypted emails in the cloud, we propose a ciphertext-based encrypted policy attribute-based encryption scheme and keyword search procedure based on hidden policy ciphertext. This feature allows the user of searching using some encrypted emails keywords in the cloud as well as allowing the emails filter-based server toward filter the content of the encrypted emails, similar to the traditional email keyword filtering service. By utilizing composite order bilinear groups, a hidden policy system has been successfully demonstrated to be secure by our dual system encryption process. Proposed system can be used with other scenarios such as searching and filtering files as an applicable method.