• Title/Summary/Keyword: 준사고

Search Result 394, Processing Time 0.032 seconds

A Car Black Box Video Data Integrity Assurance Scheme Using Cyclic Data Block Chaining (순환형 데이터 블록 체이닝을 이용한 차량용 블랙박스의 영상 데이터 무결성 보장 기법)

  • Yi, Kang;Kim, Kyung-Mi;Cho, Yong Jun
    • Journal of KIISE
    • /
    • v.41 no.11
    • /
    • pp.982-991
    • /
    • 2014
  • The integrity assurance of recorded video by car black boxes are necessary as the car black box is becoming more popular. In this paper, we propose a video data integrity assurance scheme reflecting the features of car black box. The proposed method can detect any kind of deletion, insertion, modification of frames by cyclic chaining using inter block relation. And, it provides the integrity assurance function consistently even in cases of file overwriting because of no more free space in storage, partial file data lost. And non-repudiation is supported. Experimental results with a car black box embedded system with A8 application processor show that our method has a feasible computational overhead to process full HD resolution video at 30 frames per second in a real time.

Digital Evidence Acquisition Scheme using the Trusted Third Party in Smart Grid Infrastructure (스마트그리드 환경에서 공증기관을 이용한 디지털 증거 수집 기법)

  • Cho, Youngjun;Choi, Jaeduck;Kim, Sinkyu;Seo, Jungtaek
    • Journal of the Korea Institute of Information Security & Cryptology
    • /
    • v.23 no.2
    • /
    • pp.319-328
    • /
    • 2013
  • Considerable number of major countries have put great efforts to leverage the efficiency of power consumption using Smart Grid in order to resolve the critical issues with drastical growing demands regarding electricity, the crisis of environmental pollution and so on. There has been increasing number of researches to construct Smart Grid in Korea as well. The threats of cyber terror attacks which might cause national crisises in terms of economy and society have been climbing up because of the fact that Smart Grid employs bi-directional communications embedding the cyber threats from existing/legacy communication networks. Consequently, it is required to build concrete response processes including investigation and analysis on cyber breaches into Smart Grid. However, the digital evidence acquisition techniques do not suffice to be deployed in Smart Grid systems despite of the fact that the techniques, against cyber breaches into well-known networks, have been studied in plenty of time. This work proposes a novel digital evidence acquisition scheme appropriate to Smart Grid systems through intensive investigation of the evidence acquisition requirements in Smart Grid and the historical evidence acquisition methods.

Apply AEGL for Short Time Exposure Using Regression Curve (회귀곡선을 이용한 단시간 노출에 대한 AEGL의 적용)

  • Lee, Hyunjin;Jeong, Taejun;Lee, Hyang-Jig;Jeong, Changmo;Ko, Jae-Wook
    • Journal of the Korean Institute of Gas
    • /
    • v.21 no.5
    • /
    • pp.77-82
    • /
    • 2017
  • Thus, chemicals are managed under 9 related central government department and 16 relevant laws with program such as Process Safety Management and Offsite Consequence Analysis in korea. Guidelines for set the endpoint concentration for chemcals based on the ERPG-2 (Emergency Response Planning Guidelines-2) and AEGL-2 (Acute Exposure Guidelines Level-2). but ERPG and AEGL do not describe exposure for less than 10 minutes. because of this, each guidelines define criteria differently for short time less than 10 minutes exposure. This indefinite exposure criteria would give rise to a confusion in the chemical plants, and potentially lead to a critical decision making error when accidents happen. In an effort to apply guidelines with evenly-distributed initial time frame, AEGL concentrations within 10 minute exposure time were evaluated by examining statistical regression curves. The results were in good agreement with those from the Probit Function based on each AEGL grade to explain 3 different threshold levels of exposure effects. Resultant re-enforced guidelines for endpoint chemical concentrations are, therefore, to provide powerful tool to assess and manage the risk associated with any potential chemical accidents at an early stage.

Evaluation of Limit Loads for Circumferentially Cracked Pipes Under Combined Loadings (원주방향 표면 결함이 존재하는 배관에 가해지는 비틀림을 포함한 복합하중에 대한 한계하중식 제시)

  • Ryu, Ho-Wan;Han, Jae-Jun;Kim, Yun-Jae
    • Transactions of the Korean Society of Mechanical Engineers A
    • /
    • v.39 no.5
    • /
    • pp.453-460
    • /
    • 2015
  • Since the Fukushima nuclear accident, several researchers are extensively studying the effect of torsion on the piping systems In nuclear power plants. Piping installations in power plants with a circumferential crack can be operated under combined loading conditions such as bending and torsion. ASME Code provides flaw evaluations for fully plastic fractures using limit load criteria for the structural integrity of the cracked pipes. According to the recent version of Code, combined loadings are provided only for the membrane and bending. Even though actual operating conditions have torsion loading, the methodology for evaluating torsion load is not established. This paper provides the results of limit load analyses by using finite element models for circumferentially cracked pipes under pure bending, pure torsion, and combined bending and torsion with tension. Theoretical limit load solutions based on net-section fully plastic criteria are suggested and verified with the results of finite element analyses.

Assessment of Definitions and Models of River Restoration based on the Functions, Services, and Values of River Ecosystem (하천생태계 기능, 서비스, 가치 관점에서 본 하천복원 정의 및 모형의 고찰)

  • Woo, Hyoseop
    • Ecology and Resilient Infrastructure
    • /
    • v.4 no.3
    • /
    • pp.123-129
    • /
    • 2017
  • This study aims to identify and reduce the gaps of understandings and thoughts of river restoration between river engineers and ecologists by logically re-examining the definition and value of river restoration. For this purpose, function, and goods and services of river ecosystem are analyzed based on the study of those by de Groot et al. (2002). From the result of this analysis, definitions and strategies of presently-known river restoration and its similar activities are re-examined. Next, presently-known river restoration models, ERM (Ecological restoration model), ARM (Amenity restoration model) and semi-ERM (semi-Ecological restoration model), are reinforced in their frameworks. This study is expected to narrow the gap, between the professionals of different fields, of their understandings and thoughts of river restoration.

Development of Integrated Safety Management Guidelines and Applicability Validation - Focused on the Building Deconstruction Works - (건축물 해체공사의 통합 안전관리 가이드라인 개발 및 적용성 평가)

  • Choi, Jong-Soo;Heo, Seong-Tae;Go, Won-Joon;Lee, Hee-Min
    • Korean Journal of Construction Engineering and Management
    • /
    • v.11 no.6
    • /
    • pp.45-53
    • /
    • 2010
  • Safety management for building deconstruction works has been received extremely limited attention in the domestic construction society. Lack of systematic safety management practices and defective education system lead to the high level of fatality compared to that of advanced countries. Under the above domestic deconstruction environment, the authors intend to develope an integrated safety management guidelines that covers both mechanical and partial deconstruction works. Research outcome includes such specific educational materials as safety manual, checklists, pocket pamphlets, and e-manuals. Furthermore, to validate the applicability of the above materials, questionnaire survey and interviews were conducted. Detailed descriptions are provided for each research outcome.

Drowsy Driving Detection Algorithm Using a Steering Angle Sensor And State of the Vehicle (조향각센서와 차량상태를 이용한 졸음운전 판단 알고리즘)

  • Moon, Byoung-Joon;Yeon, Kyu-Bong;Lee, Sun-Geol;Hong, Seung-Pyo;Nam, Sang-Yep;Kim, Dong-Han
    • 전자공학회논문지 IE
    • /
    • v.49 no.2
    • /
    • pp.30-39
    • /
    • 2012
  • An effective drowsy driver detection system is needed, because the probability of accident is high for drowsy driving and its severity is high at the time of accident. However, the drowsy driver detection system that uses bio-signals or vision is difficult to be utilized due to high cost. Thus, this paper proposes a drowsy driver detection algorithm by using steering angle sensor, which is attached to the most of vehicles at no additional cost, and vehicle information such as brake switch, throttle position signal, and vehicle speed. The proposed algorithm is based on jerk criterion, which is one of drowsy driver's steering patterns. In this paper, threshold value of each variable is presented and the proposed algorithm is evaluated by using acquired vehicle data from hardware in the loop simulation (HILS) through CAN communication and MATLAB program.

A Study on Improvement of Design Method for Freeway Diverging Areas (고속도로 분류부 설계기법 개선 연구)

  • Park, Jae-Beom;Lee, Seung-Jun;Gang, Jeong-Gyu;Kim, Il-Hwan
    • Journal of Korean Society of Transportation
    • /
    • v.25 no.1 s.94
    • /
    • pp.23-35
    • /
    • 2007
  • Freeway diverging areas are very vulnerable to traffic accidents due to abrupt vehicle speed changes and geometric changes. Therefore, in designing diverging areas, much attention should be Paid to safety The Present design criteria about freeway diverging areas regulate transition sections for lane changes, deceleration lanes, transition corves for direction changes. and other similar items. However, the design criteria were often violated in implementation because of ambiguities in the criteria. This study aims at clarifying and improving the present design criteria for freeway diverging areas. For this, field survey data and traffic accident data for diverging areas were analyzed.

A Study on the Improvement of Risk Assessment Items and Index for Sunken Ship (침몰선박 위해도 평가항목 및 평가지수 개선에 관한 연구)

  • Lee, Seung-Hyun;Choi, Hyuek-Jin;Suh, Jae-Joon
    • Journal of the Korean Society of Marine Environment & Safety
    • /
    • v.21 no.6
    • /
    • pp.704-711
    • /
    • 2015
  • In this study, we have conducted a survey of AHP technique through the ocean experts to derive new items and revise assessment items and indices for risk of sunken ships based on the survey results. As a result of the survey, two new items such as accident cause and tidal current are derived. And it shows that existing items such as toxic liquid substance, remaining oil and explosive gas which were evaluated as one group are desirable to be evaluated respectively. Accordingly, we analyze the indices of the new eleven assessment items adjusted from the existing seven assessment items. As a result, the indices are ordered by toxic liquid substance, possibility of leaking, explosive gas, carrying capacity of fuel oil, sensitivity of sea environment, marine traffic environment, cause of accident, tidal current, keel clearance, ship type, and ship size. Especially, as compared with the indices of existing assessment items, the indices of sensitivity of sea environment and possibility of leaking are higher and the index of keel clearance is lower.

A Study on the improvement of current construction safety management system (건설공사 안전관리 개선방안에 관한 연구)

  • Jung, Jae-Woo;Kim, Tae-Yang;Kim, Hang-Su;Cho, Young-Jun
    • Proceedings of the Korean Institute Of Construction Engineering and Management
    • /
    • 2007.11a
    • /
    • pp.691-694
    • /
    • 2007
  • Today, current society is unceasingly changing. This phenomenon accelerate building to high-rise and complex. According to that, to build a construction structure, the safety management facilities, safety education & training for employee and consciousness for safety should be set aside. But, the occurrence of safety injury is not decreasing now. Therefore, to reduce safety injury and to enhance the consciousness of employee for safety, redesign of safety management system, reallocation of safety liability for privity, revise of safety educational system were suggested in this paper.

  • PDF