• Proceedings of the Korean Society of Precision Engineering Conference
• /
• 2003.06a
• /
• pp.1751-1754
• /
• 2003

Due to advances in information technology, even Engineering Simulations can now be performed in web-based JAVA through an integrated operating system called Virtual Machine and the use of byte code, which guarantees the compatibility of identical codes in every computing system and makes it suitable for web-based simulation system development. This paper introduces an implementation embodied in JAVA Applet that allows a block-diagram type GUI that runs in a web browser for use in the dynamics simulation modeling of powertrains of vehicles and multi-body systems. This system is not restrained by any of the H/W and S/W in the user's computer, so that it has the advantage of providing a GUI that allows web-based block-diagram type modeling.

• Proceedings of the Korean Information Science Society Conference
• /
• 2000.04a
• /
• pp.585-587
• /
• 2000

본 논문은 웹 기반의 Java 바이트 코드의 이해를 지원하는 XML(eXtensible Markup Language)문서를 생성하는 것을 목적으로 한다. 기존 XML 문서는 사용자가 임의로 태그를 생성하여 확장할 수 있는 장점이 있는 반면에 프로그램에 대한 태그의 정적인 정보만을 제공하는 단점이 있다. 따라서 정적인 정보만을 제공하는 XML 문서에 Java 바이트 코드를 Javap로 역어셈블(disassemble)하여 얻을 수 있는 메소드 호출의 동적인 정보를 추가할 필요가 있다. 본 논문은 이러한 Java 바이트 코드에 대해 동적.정적인 정보가 포함되어 있는 XML 문서를 웹 상에서 클라이언트에게 다운로드(down load)할 수 있는 기능을 제공하여 Java 프로그램의 이해도를 증진시키는데 그 의의가 있다.

• Proceedings of the Korean Information Science Society Conference
• /
• 2005.07b
• /
• pp.307-309
• /
• 2005

컴퓨터 성능의 향상으로 고비용의 수행을 요하는 뮤테이션 분석 기법의 적용 가능성이 커지면서, 객체지향 프로그램을 대상으로, 특히 자바 프로그램에 대하여, 뮤테이션 분석 기법에 관한 연구가 수행되었다. 자바의 경우, 바이트 코드를 이용한다면 소스코드 없이 오류 프로그램인 뮤턴트들을 생성할 수 있을 뿐만 아니라, 소스코드를 이용할 때보다 뮤테이션 분석을 빨리 수행할 수 있는 장점이 있다. 하지만 현재 이러한 장점을 효율적으로 활용할 수 있는 바이트 코드 수준의 연산자는 나와있지 않다. 본 논문에서는 자바 바이트 코드를 대상으로 하는 메소드 수준의 뮤테이션 연산자를 정의한다. 개발한 뮤테이션 연산자는 소스코드 수준에서 사용자가 범할 수 있는 오류만을 대상으로 한다. 따라서 소스 코드를 대상으로 하는 뮤테이션 분석의 기능을 모두 보여주면서, 성능향상을 가져다 준다.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2011.04a
• /
• pp.265-268
• /
• 2011

자바는 개발환경의 편리성과 재사용성, 이식성으로 다양한 시스템 환경에서 사용한다. 그러므로 자바는 오류 없이 안전하게 실행하는 것이 중요하다. 하지만 자바 바이트 코드를 통한 자바의 안전한 실행에 대한 검증은 스택코드, 코드의 정보부족 등의 이유로 검증을 어렵게 한다. 본 논문에서는 자바 바이트코드의 문제점을 해결하여 검증을 수행하는데 적합한 중간표현 언어를 소개한다. 중간표현 언어는 스택리스코드로 구현되며, 모든 명령어의 정보를 담고 있다. 이를 통해, 자바 바이트코드를 통한 검증을 수행할 것이다.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2011.11a
• /
• pp.213-215
• /
• 2011

프로그램에 대한 검증을 수행하기 위해서는 자료흐름을 알아야 하고, 입력된 프로그램에 대응하는 제어흐름그래프(control flow graph)가 필요하다. 이에 더하여 제어흐름 그래프를 시각화한다면 사용자 입장에서는 더 편한 프로그램이 될 것이다. 본 논문에서는 자바 프로그램의 검증도구에 사용하는 중간 표현 언어 중 하나인 BIRS(Bytecode Intermediate Representation with Specification)에 의해 생성되는 제어흐름그래프를 시각화하는 방법에 대해 제안한다.

• Journal of Korea Multimedia Society
• /
• v.23 no.5
• /
• pp.650-657
• /
• 2020

The rapid growth of internet users and faster network speed are driving the new ICT services. ICT Technology has improved our way of thinking and style of life, but it has created security problems such as malware, ransomware, and so on. Therefore, we should research against the increase of malware and the emergence of malicious code. For this, it is necessary to accurately and quickly detect and classify malware family. In this paper, we analyzed and classified visualization technology, which is a preprocessing technology used for deep learning-based malware classification. The first method is to convert each byte into one pixel of the image to produce a grayscale image. The second method is to convert 2bytes of the binary to create a pair of coordinates. The third method is the method using LSH. We proposed improving the technique of using the entire existing malicious code file for visualization, extracting only the areas where important information is expected to exist and then visualizing it. As a result of experimenting in the method we proposed, it shows that selecting and visualizing important information and then classifying it, rather than containing all the information in malicious code, can produce better learning results.

• The Journal of the Institute of Internet, Broadcasting and Communication
• /
• v.20 no.2
• /
• pp.39-44
• /
• 2020

Malicious codes cause damage to equipments while avoiding detection programs(vaccines). The reason why it is difficult to detect such these new malwares using the existing vaccines is that they use "signature-based" detection techniques. these techniques effectively detect already known malicious codes, however, they have problems about detecting new malicious codes. Therefore, most of vaccines have recognized these drawbacks and additionally make use of "heuristic" techniques. This paper proposes a technology to detecting unknown malicious code using deep learning. In addition, detecting malware skill using Supervisor Learning approach has a clear limitation. This is because, there are countless files that can be run on the devices. Thus, this paper utilizes Stacked Convolution AutoEncoder(SCAE) known as Semi-Supervisor Learning. To be specific, byte information of file was extracted, imaging was carried out, and these images were learned to model. Finally, Accuracy of 98.84% was achieved as a result of inferring unlearned malicious and non-malicious codes to the model.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2010.05a
• /
• pp.882-885
• /
• 2010

In view of the severe energy constraint in sensor networks, it is important to use the error control scheme of the energy efficiently. In this paper, we presented FEC (Forward Error Correcting) codes in terms of their power consumption. One method of FEC is RS (Reed-Solomon) coding, which uses block codes. RS codes work by adding extra redundancy to the data. The encoded data can be stored or transmitted. It could have errors introduced, when the encoded data is recovered. The added redundancy allows a decoder to detect which parts of the received data is corrupted, and corrects them. The number of errors which are able to be corrected by RS code can determine by added redundancy. We could predict the lifetime of RS codes which transmitted at 32 byte a 1 minutes. RS(15, 13), RS(31, 27), RS(63, 57), RS(127,115), and RS(255,239) can keep the days of 138, 132, 126, 111, and 103 respectively.

• Journal of the Institute of Electronics Engineers of Korea SP
• /
• v.40 no.6
• /
• pp.20-30
• /
• 2003

In a conventional method based on quadrature 2D Gator wavelets to extract iris features, the iris recognition is performed by a 256-byte iris code, which is computed by applying the Gabor wavelets to a given area of the iris. However, there is a code redundancy because the iris code is generated by basis functions without considering the characteristics of the iris texture. Therefore, the size of the iris code is increased unnecessarily. In this paper, we propose a new feature extraction algorithm based on the ICA (Independent Component Analysis) for a compact iris code. We implemented the ICA to generate optimal basis functions which could represent iris signals efficiently. In practice the coefficients of the ICA expansions are used as feature vectors. Then iris feature vectors are encoded into the iris code for storing and comparing an individual's iris patterns. Additionally, we introduce two methods to enhance the recognition performance of the ICA. The first is to reorganize the ICA bases and the second is to use a different ICA bases set. Experimental results show that our proposed method has a similar EER (Equal Error Rate) as a conventional method based on the Gator wavelets, and the iris code size of our proposed methods is four times smaller than that of the Gabor wavelets.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.34 no.9C
• /
• pp.848-854
• /
• 2009

DVB-SSP is a new broadcasting system for hybrid satellite communications, which supports mobile handhold systems and fixed terrestrial systems. An upper layer, including erasure Reed-Solomon error correction combined with cyclic redundancy check. However, a critical factor must be considered in upper layer decoding. If there is only one bit error in an IP packet, the entire IP packet is considered as unreliable bytes, even if it contains correct bytes. If, for example, there is one real byte error, in an If packet of 512 bytes, 511 correct bytes are erased from the frame. Therefore, this paper proposed upper layer decoding methods; hybrid decoding. By means of simulation we show that the performance of the proposed decoding algorithm is superior to that of the conventional one in AWGN channel and TI channel.