• Journal of the Korean Society of Safety
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• v.22 no.5
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• pp.21-26
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• 2007

The computer program is developed to simulate the evacauation time for a building which is made geometrically complex. The program is intended for use both as a search and a design tool to analyze the evacuation safety through a wide range of structure environments. The computer program has a function of importing FDS's result to each individual resident in the building. These attributes include a walking speed reduction by producing visibility reduction for each person on the fire. $A^*$ pathfinding algorithm is adopted to calculate the simulation of escape movement, overtaking, route deviation, and adjustments to individual speeds due to the proximity of crowd members. Finally, a case study for a theater is presented to compared the calculated evacuation time with SIMULEX in detail. This program contribute to a computer program that evaluates the evacuation time of individual occupants as they walk towards, and through the exits especially for building, underground spaces like a subway or tunnel.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.28 no.12
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• pp.124-129
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• 2014

This paper describes the analysis of the effect on personnel computer in case of turning off power supply of main breaker in general electrical installation. In order to analyze the effect on personnel computer in case of turning off the power supply of main breaker, the switching impulse generator has been designed and fabricated which makes it possible to evaluate the effect on electrical product by switching impulse. The switching impulse tests were carried out for personnel computer according to applied voltage and number of switching impulse. As a consequence, switching impulse had not a significant influence on personnel computer in this study. The varistor of power input section functions as a protection of switching impulse as well as lightning impulse. The results will be used to related organization, and electrical product manufacturer, and residents.

• Nuclear Engineering and Technology
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• v.52 no.3
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• pp.560-567
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• 2020

The complexity of safety critical systems of Nuclear Power Plant continues to increase rapidly due its transition from analog to digital systems. It has thus become progressively more imperative to model these systems prior to their implementation in order to meet the high performance, safety and reliability requirements. Timed Petri Nets (TPNs) have been widely used to model such systems for non-functional analysis. The paper presents a novel methodology for the analysis of the performance metrics using PN modeling. The paper uses the isomorphism property of the TPNs and the Markov chains for the performance analysis of the safety critical systems. The presented methodology has been validated on a Shutdown System of a Nuclear Power Plant.

• Journal of the Korea Society of Computer and Information
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• v.23 no.5
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• pp.25-29
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• 2018

As society advances and consumers' perception of food safety changes, the demand for the safety of refrigerated and distributed foods is spreading. In this paper, we build an ICT system that can collect the TTH data from the NFC tag, store it, analyze the food safety level using it. This service platform consists of the temperature monitoring NFC tag attached to individual packaged food, the smartphone with NFC sensor, and the monitoring server with a big data system. Consumers and administrators in this system can easily identify and predict the safety level of individual packaged foods in real time using the provided app on smartphones. In the field of food safety, the use of new technologies such as ICT can create new value by combining with existing food industry in addition to creating new market by new service.

• Journal of the Korea Safety Management & Science
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• v.6 no.3
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• pp.327-337
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• 2004

The soaring increase in the number of Internet users combined with the constant computerization of business process has created new opportunities for computer criminals and terrorist. Fortunately, the computer security field is also progressing at a brisk rate. In particular, the field of computer forensics brings new ways of preserving and analyzing evidence related to computer crime. Computer forensics is a new emerging professions of the 21st century. It is the collection, preservation, analysis, and presentation of computer related evidence. For this reason, the various technology of computer forensics is regarded as a powerful tool for suppressing computer crime. Our aims is to introduce the overview of computer forensics technology. We also present the survey results of the state of the art of computer forensics in the domestics and of foreign country.

• 한국디지털정책학회:학술대회논문집
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• 2007.06a
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• pp.341-347
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• 2007

본 연구는 현재와 미래의 유비커터스 도시생활에 있어서 범죄를 줄이고 철저한 대비를 하기 위하여 각종 범죄에 관한 예방 및 실제상황 정보를 체계적으로 수집 및 분석하고 이를 활용 할 수 있는 U-Safety시스템이 요구되고 있다. 안전한 삶을 위협하는 다양한 요인들에 유비쿼터스 기술을 이용하여 W-safety를 구현해 보고자 몇 가지 방법들을 사례를 통해 고찰하였다.

• Journal of the Korea Society of Computer and Information
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• v.22 no.8
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• pp.33-39
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• 2017

In this paper, we propose a method which implements warning to drivers through real-time analysis of risky and unexpected driver and vehicle behavior using only a smartphone without using data from digital tachograph and vehicle internal sensors. We performed the evaluation of our system that demonstrates the effectiveness and usefulness of our method for risky and unexpected driver and vehicle behavior using three information such as vehicle speed, azimuth and GPS data which are acquired from a smartphone sensors. We confirmed the results and developed the smartphone application for validate and conducted simulation using actual driving data. This novel functionality of the smartphone application enhances drivers' situational awareness, increasing safety and effectiveness of driving.

• Proceedings of the Korean Society of Computer Information Conference
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• 2017.01a
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• pp.7-8
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• 2017

각종 산업현장에서 작업자들의 안전 불감증으로 인해 발생하는 안전사고는 매년 꾸준히 증가하고 있는 추세이다. 본 논문에서 제안하는 스마트 작업자 안전벨트 및 행동인식 기반 위험경보 시스템은 이러한 상황을 방지하고자 작업자가 안전벨트의 훅을 제대로 걸지 않고 일을 진행하는 경우, 작업장 내에서 뛰어다니는 경우, 잘못된 자세로 일하는 경우를 시스템에서 인지하고 작업자, 관리자에게 알림을 줌으로서 작업자의 안전사고를 예방할 수 있도록 하였다.

• Proceedings of the Korean Society of Computer Information Conference
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• 2018.07a
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• pp.443-444
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• 2018

산업현장에서 직업 특성상 무거운 자재를 옮기는 일이 많다. 이때 과도한 무게로 인한 넘어짐, 신체적 피해와 끼임 사고 등 각종 일어날 수 있는 사고에 대해 개인이 조치할 수 없는 일이 대부분이다. 본 논문에서는 안전화에 IoT 기술을 적용해 작업자의 발의 압력분포도를 수집 저장하여 그 데이터를 통해 관리자가 작업자의 행동을 모니터링하고 그에 따른 무거운 자재를 들었을 때의 치우침과 균형을 판별할 수 있도록 설계하였다.

• Journal of Computing Science and Engineering
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• v.11 no.1
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• pp.9-23
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• 2017

NuDE 2.0 (Nuclear Development Environment 2.0) is a formal-method-based software development, verification and safety analysis environment for safety-critical digital I&Cs implemented with programmable logic controller (PLC) and field-programmable gate array (FPGA). It simultaneously develops PLC/FPGA software implementations from one requirement/design specification and also helps most of the development, verification, and safety analysis to be performed mechanically and in sequence. The NuDE 2.0 now consists of 25 CASE tools and also includes an in-depth solution for indirect commercial off-the-shelf (COTS) software dedication of new FPGA-based digital I&Cs. We expect that the NuDE 2.0 will be widely used as a means of diversifying software design/implementation and model-based software development methodology.