• Journal of the Korean Society for Railway
• /
• v.12 no.6
• /
• pp.1043-1048
• /
• 2009

PES (Programmable Electronic System) is used by software development for the train control system. PES has been widely used in real world and consists of hardware, firmware and application software. The PES are easily apply to many applications because its implementation has high flexibility. Many safety critical functions are realized through software in safety critical system. Normally, it is difficult to detect failures for PES system because the PES is too sophisticated to identify sources of the failure. So, the reliability analysis is needed by using software fault tolerance techniques. Currently, there are the recovery block, distributed recovery block, N-version programming, N self-checking programming in fault tolerance techniques. In this paper, the models of recovery block and N-version programming in software fault tolerance techniques are suggested by using the Markov model. Also, the reliability in the train control system is analyzed through changing time. The fault occupancy rates of the program, adjustment test and voter are stationary. So, the relation between time and reliability is presented by using Matlab program. In the result of reliability, the reliability of recovery block is more high than N-version programming in case of the same number of substitution block.

• Proceedings of the Korea Concrete Institute Conference
• /
• 2009.05a
• /
• pp.21-22
• /
• 2009

This paper presents the results of an experimental study on flexural behavior and cracking process of concrete beams subjected to cycles of freezing and thawing after patch-repaired with strain-hardening cement composites (SHCCs). The SHCCs were reinforced with hybrid 0.75% PVA and 0.75% PE fibers. Experimental testing of concrete beams patch-repaired with SHCCs revealed that the SHCC patch-repair system without freeze thaw (FT) exposure showed average 3.31 times increased load carrying capacity and for beams exposed to 300 FT cycles, load carrying capacity increased up to 2.42 times. Cracking damage of SHCC patch-repaired beams mitigated compared to plain concrete beams but this trend decreased under FT exposure.

• KOREAN JOURNAL OF CROP SCIENCE
• /
• v.40 no.1
• /
• pp.39-43
• /
• 1995

In the culture of Vinyl mulching and Non mulching, growth, yield, and cotton hair's growth are studied at the different planting density to get a basic material for cotton culture and high yield bumper crop in the region of the South. And the results are following. Vinyl mulching is the best one at the strength, the number of boll bearing branches, the num-ber of bolls, the number of bolls per $m^2$ and all the other characters. Vinyl mulching and Non mulching have the greatest number of bolls per $m^2$ at the planting density of 70${\times}$10cm. Vinyl mulching has the highest seed cotton yield and the highest seed cotton yield per boll. Especially when planted at the density of 70${\times}$l0cm, Vinyl mulching and Non mulching have the highest seed cotton yield. Vinyl mulching's value is accepted in fiber length and lint percentage, the wider spacing in the row is, the longer fiber length is.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.20 no.8
• /
• pp.1553-1560
• /
• 2016

In this paper, we design a program that controls the execution permissions for the running application in the Windows system environment. It does not allow general users to execute the program converting the specific location information of the execution program, to any of the bit values with the formal structure information in window program. The converted bit value can be returned to the original bit value in the case of an authorized user, so that the original program can be normally performed. By doing so, it can be more safely used in the risk of reverse engineering for Windows executable program. We implemented the control program for the program execution authority we proposed in this paper, and the experiment was performed. At the results of experiments, it was confirmed that the control function to permit execution for the user program was working properly in the Windows environment.

• Proceedings of the Computational Structural Engineering Institute Conference
• /
• 2011.04a
• /
• pp.214-217
• /
• 2011

두가현수교는 2010년 8월 집중호우로 인해 유실된 교량을 복구하기 위한 과업으로서 향후 재발방지를 위해 중앙 경간장을 증가시켜 통수단면적을 추가확보하고, 교량 여유고를 상향시켜 수해에 대비한 견고한 교량으로 계획하였다. 또한 보행자의 통행을 위한 보도육교의 특성을 고려하여 지역의 관광자원이 될 수 있도록 중앙경간 125m의 V형 주탑 3차원 보도현수교로 설계하였다. 보강거더는 H-Beam을 이용하여 자재 수급 및 취급이 용이하며 강재 바닥판을 적용하여 보다 경량화된 보강거더를 적용함으로써 주케이블의 장력 감소에도 기여하도록 하였으며, 행어정착을 위한 별도의 정착거더를 채택한 ${\pi}$형식을 채택하여 풍동실험을 통해 내풍 안정성을 확인하였다. 주케이블 및 행어는 미관, 구조적 안정성, 유지관리성 및 가설의 용이함을 고려하여 PE를 피복한 PWS케이블을 선정하였다. 경관을 고려한 V형 주탑을 이용한 3차원 케이블을 채택하여 지역의 상징물을 표현하였으며 기초의 규모를 최소화 하였다. 또한 H형 및 A형 주탑과의 비교를 통해 V형 주탑 교량의 특성을 검토하였다.

• Journal of Platform Technology
• /
• v.11 no.2
• /
• pp.39-53
• /
• 2023

Non-installation program (hereinafter referred to as "portable program") is a program that can be used without an installation process, unlike general software. Since there is no separate installation process, portable programs have high mobility and are used in various ways. For example, when initial setup of multiple PCs is required, a portable program can be stored on one USB drive to perform initial setup. Alternatively, when a problem occurs with the PC and it is difficult to boot normally, Windows PE can be configured on the USB drive and portable programs can be stored for PC recovery. And the portable program does not directly affect PC settings, such as changing registry values, and does not leave a trace. This means that the portable program has high security. If a portable program is deleted after using it, it is difficult to analyze behavior in a general way. If a user used a portable program for malicious behavior, analysis in a general way has limitations in collecting evidence. Therefore, portable programs must have a new way of behavioral analysis that is different from ordinary installation software. In this paper, after installing the Windows 10 operating system on a virtual machine, we proceed with the scenario with a portable program of Opera and Notepad++. And we analyze this in various ways such as file analysis of the operating system and memory forensics, collect information such as program execution time and frequency, and conduct specific behavioral analysis of user.