• Proceedings of the Korea Information Processing Society Conference
• /
• 2016.04a
• /
• pp.283-285
• /
• 2016

최근 정보통신 기술의 발전과 함께 M2M(Machine-to-Machine) 산업분야의 시스템이 다기능 고성능화되고 있으며 IoT(Internet of Things), IoE(Internet of Everything)기술 등과 함께 많은 발전해가고 있다[1]. 가장 오래 된 정보통신 기술의 근간인 웹 애플리케이션은 점점 발전하고 고도화 되어가고 있으며 이러한 웹 애플리케이션을 해킹하는 기술도 다양한 관점에서 발전하고 있다. 웹 애플리케이션을 구성하는데 필수적인 파일인 TTF(True Type Font)파일에 대한 보안적 관심이 필요하다. TTF파일을 외부에서 받아옴으로서 웹 애플리케이션에 적용시키는 방식을 사용할 때, 다른 서버에서 URL을 통해 받아오는 TTF파일에 대해 보안적 검사가 제대로 실행되지 않는다. 본 논문에서는 TTF파일의 감염과 그 파일에 대한 대응 방법을 제안하고자 한다.

• Journal of Digital Contents Society
• /
• v.2 no.1
• /
• pp.9-19
• /
• 2001

Web robot is an important Internet software technology used in a variety of Internet application software which includes search engines. As Internet continues to grow, implementations of high performance Web robots are urgently demanded. For this, researches specially geared toward performance scalability of Web robots are required. Hoover, because researches are focused mostly on addressing issues related to commercial implementations, scientific researches and studies are not still made on the performance scalability. In this research, Ive choose a Web robot model implemented by fork-join based. multiprocesses. With respect to the model, we evaluate the effect on the collection efficiency that the timeout values set to requests from Web robots to Web servers have. Also, we analysed the behaviors of Web robots by comparing the execution time between the URL extraction and the uniqueness checking for the extracted URLs. as well as by comparing between the computation time and the network time. Based on the analysis result, we suggest the direction for the design of high performance Web robots.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2011.05a
• /
• pp.637-640
• /
• 2011

기존의 보안시스템은 설비가 비싸고 녹화를 끊임없이 계속함에 따라 저장 용량이 커야하는 문제점이 있고 영상을 단순히 저장하는 외에 다른 부가적 기능이 없다. 본 연구에서는 고성능, 고가의 장비가 아닌 단순한 PC 카메라 와 일반컴퓨터를 이용한 화상 보안 시스템을 제안 한다. 이 시스템은 단순한 녹화 외에 다양한 부가기능을 포함하고 있으며 프로그램이 설치된 컴퓨터를 떠난 외부에서도 감지한 침입을 통보 받을 수 있다. Main Application의 역할은 감시, 재생, 통계, 필터로 분류된다. 카메라에서 실시간으로 보내오는 영상을 메인 프로그램에서 보여주고 일시 정지, 필터 바로 가기 등을 통하여 필터와 연계된다. 이미 저장된 영상은 재생기능을 통하여 재생하며 이제까지 저장된 영상들은 모두 데이터베이스에 통계 화 되어 저장된다. 또한 실시간으로 보여 지는 영상들을 일정한 간격으로 웹 서버로 보내진다.

• Journal of KIISE
• /
• v.43 no.5
• /
• pp.524-530
• /
• 2016

The desire to access data faster and the growth of next-generation memories such as non-volatile memories, contribute to the development of research on memory file systems. It is recommended that memory mapped file I/O, which has less overhead than read-write I/O, is utilized in a high-performance memory file system. Memory mapped file I/O, however, brings a page table overhead, which becomes one of the big overheads that needs to be resolved in the entire file I/O performance. We find that same overheads occur unnecessarily, because a page table of a file is removed whenever a file is opened after being closed. To remove the duplicated overhead, we propose the mapping cache, a technique that does not delete a page table of a file but saves the page table to be reused when the mapping of the file is released. We demonstrate that mapping cache improves the performance of traditional file I/O by 2.8x and web server performance by 12%.

• Journal of the Institute of Electronics and Information Engineers
• /
• v.50 no.5
• /
• pp.150-164
• /
• 2013

Currently it is being gradually focused on the mobile application's processing performance implemented by Javascript and HTML (Hyper Text Markup Language) due to the dissemination of mobile web application supply based on the WAC (Wholesale Application Community). If the application software has a simple functional processing structure, then the problem is benign, however, the load of a browser is getting heavier as the amount of Javascript processing is being increased. There is a limitation on the processing time and capacity of the Javascript in the ordinary mobile browsers which are on the market now. In order to solve those problems, the Web Worker that is not supported from the existing Javascript technology is now provided by the HTML 5 to implement the multi thread. The Web Worker provides a mechanism that process a part from the single thread through a separate one. However, it can not guarantee the computing ability as a native application on the mobile and is not enough as a solution for improving the fundamental processing speed. The Cyclostorm overcomes the limitation of resources as a mobile client and guarantees the performance as a native application by providing high computing service and ascripting the Javascript process on the mobile to the computer server on the cloud. From the performance evaluation experiment, the Cyclostorm shows a maximally 6 times faster computing speed than in the existing mobile browser's Javascript and 3 to 6 times faster than in Web Worker of the HTML 5. In addition, the usage of memory is measured less than the existing method since the server's memory has been used. In this paper, the Cyclostorm is introduced as one of the mobile cloud computing services to conquer the limitation of the WAC based mobile browsers and to improve the existing web application's performances.

• The Journal of the Korea Contents Association
• /
• v.11 no.3
• /
• pp.26-35
• /
• 2011

In these days, internet environment are very quickly development as well on-line service have been using a online for the mission critical business around the world. As the amount of information to be processed by computers has recently been increased there has been cluster computing systems developed by connecting workstations server using high speed networks for high availability. but cluster computing technology are limited for a lot of IT resources. So, grid computing is an expanded technology of distributed computing technology to use low-cost and high-performance computing power in various fields. Although the purpose of Grid computing focuses on large-scale resource sharing, innovative applications, and in some case, high-performance orientation, it has been used as conventional distributed computing environment like clustered computer until now because grid middleware does not have common sharable information system. In order to use grid computing environment efficiently which consists of various grid middleware, it is necessary to have application-independent information system which can share information description and services, and expand them easily. This paper proposed new database architecture and load balancing for high availability through Grid technology.