• Journal of the Korea Institute of Information Security & Cryptology
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• v.11 no.4
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• pp.3-14
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• 2001

A Web server makes use of the HTTP(Hyper Text Transfer Protocol) to communicate with a client. The HTTP is a stateless protocol; the server does not maintain any state information for ongoing interactions with the client. Therefore, the HTTP inevitably requires additional overhead as repeating data key-in to user for continuing communications. This overhead in Web environment can be resolved by the cookie technologies. However, the cookie is usually unsecured due to the clear-text to transfer on the network and to store in the file. That is, information in the cookie is easy to exposure, copy, and even change. In this paper, we propose a secure cookie mechanism appropriate to Web environment, and then present a design and implement of secure Web system based on the scheme. The Web system can be used to any web environment. It also provides some security services, such as confidentiality, authentication, integrity.

• Journal of the Korean Society of Marine Environment & Safety
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• v.27 no.1
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• pp.1-12
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• 2021

The International Maritime Organization (IMO) is promoting the introduction of e-Navigation that prevents maritime accidents by fusion of Information & Communication Technology (ICT) with ship operation technology. In Korea, Korean e-Navigation is also being developed for fishing vessels and small vessels sailing offshore, which are vulnerable to maritime accidents. However, for the successful development of Korean e-Navigation, it is necessary to develop an indicator that can evaluate the development performance so that the development performance that has been progressed so far can be evaluated and the development direction can be re-established. Therefore, this study attempted to develop an evaluation index tailored to the development goal of e-Navigation service centering on the collision accident, which is a major maritime accident. In this study, a collision accident evaluation index for e-Navigation service was developed by deriving and quantifying the root cause of maritime collision accidents using Root cause analysis(RCA) and fault tree analysis (FTA) techniques. This indicator is considered to be helpful in reducing maritime accidents as it is used as a development indicator for e-Navigation and an indicator for maritime collision accident analysis.

• The Journal of the Convergence on Culture Technology
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• v.7 no.4
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• pp.735-743
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• 2021

The mobile electronic notice service (MENS) is a service that delivers a mobile electronic notice to a smartphone in the person's name through an authorized electronic document intermediary instead of a bill that was delivered by mail using paper. In order to provide the MENS, information is needed to identify the same user between the sending agency and the authorized electronic document relay. In this paper, we propose a standard for safe conversion and utilization of Connecting Information (CI) used as user identification information for MENS. In the proposed method, it is necessary for the requesting institution to send the electronic notice to provide the resident registration number to the identity verification institution and convert it into the CI. In this case, a safe and efficient MENS will be possible by proposing a review standard and processing method to verify the appropriateness of the conversion of CI. By applying the proposed method to the MENS, it can contribute to service activation and reinforcement of user privacy protection.

• Tunnel and Underground Space
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• v.32 no.6
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• pp.397-410
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• 2022

The safety of the disposal repository for high level radioactive waste should be guaranteed for a quite long period so that the precise evaluations are required. The site characteristics of the discontinuities are essential part of the safe repository design including engineered barrier and natural barrier systems. The discontinuities act like weak planes and at the same time, they act as flow paths so that their features should be investigated thoroughly. RQD (Rock Quality Designation) is one of the most widely applied characterizing methods due to its simplicity, however, modified designations have been proposed because RQD has some drawbacks, such as its directivity and dependence on the threshold length. This study aims to evaluate the applicability of the modified designations by applying them to the rock mass around KURT and to produce fundamental database that will be utilized in future studies.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.42 no.6
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• pp.843-852
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• 2022

Despite continuous safety management, the death rate of construction workers is not decreasing every year. Accordingly, various studies are in progress to prevent construction site accidents. In this paper, we developed an AI-based priority inspection target selection model that preferentially selects sites are expected to cause construction accidents among construction sites with construction costs of less than 5 billion won (KRW). In particular, Random Forest (90.48 % of accident prediction AUC-ROC) showed the best performance among applied AI algorithms (Classification analysis). The main factors causing construction accidents were construction costs, total number of construction days and the number of construction performance evaluations. In this study an ROI (return of investment) of about 917.7 % can be predicted over 8 years as a result of better efficiency of manual inspections human resource and a preemptive response to construction accidents.

• Journal of the Korean Association of Geographic Information Studies
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• v.24 no.4
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• pp.82-98
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• 2021

In recent years, as the number of ground subsidence has increased nationwide, the latest and usefulness of underground information for underground space development and underground safety management has become more important than ever. However, the 3D Underground Geospatial Map project, which started in 2015, has a problem with the manual-based long-term update system. This research paper overcomes these limitations and automatically updates the 3D CAD/GIS-based integrated management of underground structures that can be managed automatically from a full-cycle perspective of underground structure data management such as processing, transformation, updating, management, and visualization of 2D/3D underground structure data. If this technology is applied, it is possible to integrate processing and update management of the existing complex 3D construction logic of underground structures in one system, and it is expected that it can be used for underground space development and underground safety management as a foundation technology for automatic update of underground structures data.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.26 no.8
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• pp.1130-1135
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• 2022

In Seoul, about 75,000 CCTVs are installed in 25 district offices. Each ward office has built a control center for CCTV control and is performing 24-hour CCTV video control for the safety of citizens. Seoul Metropolitan Government is building a smart city integrated platform that is safe for citizens by providing CCTV images of the ward office to enable rapid response to emergency/emergency situations by signing an MOU with related organizations. In this paper, when an incident occurs at the Seoul Metropolitan Government Office, the escape route is predicted by discriminating people and vehicles using the AI DNN-based Template Matching technology, MLP algorithm and CNN-based YOLO SPP DNN model for CCTV images. In addition, it is designed to automatically disseminate image information and situation information to adjacent ward offices when vehicles and people escape from the competent ward office. The escape route prediction and tracking system using artificial intelligence can expand the smart city integrated platform nationwide.

• Proceedings of the Korea Water Resources Association Conference
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• 2023.05a
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• pp.458-458
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• 2023

본 연구에서는 위성영상 활용 지능형 재난관측·감시 기술 개발을 목적으로 위성영상과 멀티소스(CCTV, 항공영상, 공공DB 등)와의 연계·융합을 통해 재난상황관리의 정확도 향상과 위성영상 활용성 제고 방안을 제시하고자 하였다. 위성영상 수집·배포시스템으로부터 전달되는 위성영상과 멀티소스의 연계 융합을 통한 재난상황정보의 표출을 목적으로 상황판연계 표출시스템 가동 절차와 위성영상 수집을 통한 위험탐지 알고리즘과의 연계를 위해 재난상황업무 기반 시스템 가동절차를 수립하고, 위기관리표준 매뉴얼 상 상황업무절차를 적용해 예비설계를 진행하였다. 상황실 실무자 설문을 통해 작성된 시스템 요구사항과 규격서를 기반으로 상황업무절차를 적용해 먼저업무시스템 설계를 진행하였다. 평시에는 GIS통합상황판에서 관리됨을 전제로 위성영상 수집에 대한국가적 예산 투입 측면을 고려해 중대본 설치가 필요한 대형재난 발생상황을 가정하여 상황판연계·표출시스템의 가동되도록 설계하였다. 또한, 위성영상 분석을 통한 피해위험도와 재난이력통계 등 멀티소스와 중첩한 결과를 실시간으로 표출함에 따라 상황실근무자는 재난확산 여부를 판단하고, NDMS를 통해 재난상황을 전파할 수 있도록 설계하였다. 상황판연계 표출시스템의 원활한 데이터 입/출력을 위해 재난유형 및 분석단계별 클래스 정의, 유스케이스 ID(요구기능)와 1:1 또는 1:n매칭을 수행하여 재난유형 및 분석단계별 클래스를 정의하였다. 정의된 클래스는 유스케이스인 요구기능과 매칭을 수행하였고, 시스템 가동절차 중 피해위험도분석, 재난이력통계, 중첩결과표출, NDMS 상황전파에 대한 상황업무절차를 기반으로 산불·홍수·산사태·대설·태풍 총 5종의재난별 시퀀스를 설계하였다. 마지막으로 화면정의서와 UI/UX설계서를 기반으로 Figma를 통해 시스템구동화면을 사전에 모의하였다. 향후, 진행되는 연구에서는 위성영상과 멀티소스를 연계한 화면을 실체화하여 더욱 정확한 재난상황관리가 가능하도록 NDMS 연계 상황판 표출 시스템을 개발하고자 한다.

• Journal of the Korean Society of Safety
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• v.38 no.3
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• pp.102-109
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• 2023

Following the accident at Fukushima, the true impact of multi-unit accidents came to light. Accordingly, research related to multi-unit accident effect analysis, risk evaluation, and accident prevention/prevention technology has been conducted. Specific examples are mobile/fixed equipment such as multi-barrier accident coping strategy (MACST) and diverse and flexible coping strategies (FLEX), which have been introduced and installed in multi-units for preventing and mitigating multi-unit accidents. These strategies are useful for enhancing the safety of nuclear power plants (NPPs); however, a more efficient strategy is required in terms of the costs of physical and human resources. To effectively and efficiently mitigate an increase in multi-unit accidents, it is necessary to not only to utilize mobile/fixed equipment but to also use crosstie options with resources that already exist at NPPs. Therefore, we analyzed the current international and domestic status of crosstie systems technology and propose a method to evaluate feasibility alongside risk based on a multi-unit probabilistic safety assessment (PSA). To analyze the international and domestic status of crosstie systems technology, actual cases and related research were studied, and a list of potential crosstie safety resources was derived. Additionally, a case study was performed on crosstie cases of two systems within the assumed six units on-site under a multi-unit accident, and a multi-unit PSA-based risk evaluation method is proposed.

• Proceedings of the Korea Water Resources Association Conference
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• 2022.05a
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• pp.512-512
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• 2022

국내 수자원 시스템은 이수 관련 기준과 이를 평가할 수 있는 지표 및 방법, 지침이 미흡한 실정으로 관련 시설물의 안정성과 형평성에 대한 문제가 제기되어 왔다. 농업용 저수지의 경우 한발 시 관개용수를 공급할 수 있는 내한능력, 기존 설계기준에 의한 물수지법에 따른 저수지의 설계한발빈도를 대체 사용하여 이수안전도를 산정하고 있으며, 설계한발빈도인 10년 한발빈도는 10년에 1회 정도의 갈수를 기준으로 한다. 농업용 저수지의 축조년도는 1940-1970년대로 약 86%가 축조된 지 50년 이상 경과하였고, 대부분 설계 한발빈도가 10년 이하로 축조되었으나 최근 발생하고 있는 기후변화, 용수관리 환경 변화, 수요량의 변화, 설계한발빈도 변화 등으로 현시점의 이수안전도 파악이 필요한 실정이다. 본 연구에서는 국가물관리기본계획에서 준용하고 있는 신뢰도 관련 이수안전도 기준인 이수안전율과 공급신뢰율을 활용하여 농업용 저수지의 이수안전도를 산정하고 기존 농업용 저수지의 이수안전도 기준인 10년 한발빈도와 비교함으로써, 농업용 저수지 이수안전도 산정기준의 적정성을 평가하고자 한다. 신뢰도 기준은 장기간 계획기간 동안 저수지의 용수부족이 얼마나 발생하는가에 대한 평가 방법으로 이수안전율은 최대 부족량과 수요량으로 산정가능한 양적기준 신뢰도이며, 공급신뢰율은 물공급부족기간으로 산정가능한 시간기준 신뢰도이다. 신뢰도 기준에 의한 방법은 저수지 모의 운영을 통한 물수지 분석을 실시하여 산정이 가능하며, 물수지 분석을 위해 한국농어촌공사에서 개발한 수리수문설계시스템 (K-HAS, Hydraulics & Hydrology Analysis System)을 사용하였다. 본 연구의 결과는 농업용 저수지의 이수관리 계획 수립 및 내한능력 평가 등 국가수자원정책의 지표로 활용할 수 있을 것으로 기대된다.