• Journal of the Society of Disaster Information
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• v.7 no.3
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• pp.171-180
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• 2011

As a great earthquake hit east Japan recently, the interests for the necessity of earthquake resistant design and earthquake resistance ability of existent structures are much increased. The damage or collapse of a bridge, as a social overhead capital structure affects socially and economically. Thus the evaluation of earthquake resistance ability of these structures is very important. The reviewing methods for earthquake resistance ability are mostly deterministic. Although the deterministic methods are fit for the evaluation of safety of each member, they are not practical for the whole structure. For the evaluation of structural safety for earthquake, the method for the evaluation of fragility or damage is needed for some stages of damage. In this paper, fragility curves of steel box bridge using RFPB bearing for PGA, PGV, SA, SV, SI are constructed, and these are compared with the cases of FPB.

• Journal of Digital Convergence
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• v.21 no.2
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• pp.17-25
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• 2023

The purpose of this study was to analyze the characteristics of elderly motorcycle accidents according to data from elderly inpatients to prepare prevention measures for the elderly against injury in motorcycle accidents. Chi-squared test, independent sample t-test, and canonical correlation analysis were performed on the Korea Disease Control and Prevention Agency's National Hospital Discharge In-depth Injury Survey data from 2015 to 2019, from which the records of 1,384 elderly inpatients hospitalized because of motorcycle accidents were obtained. intracranial injury(S06) was the most common care and treatment characteristic for both age groups. The most frequent injury site was the head and neck, and the most frequent injury type was a fracture. The above findings show that prevention education and policy formulation at the national level are necessary to identify and manage the factors of elderly motorcycle accidents. This study provides basic data for developing measures and policies to prevent and reduce injuries, making it significant for public health causes.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.34 no.2
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• pp.193-206
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• 2024

In tandem with the advancements in the digital era, the significance of digital data has escalated, necessitating an increased focus on digital forensics investigations. However, the process of collecting and analyzing digital evidence faces significant challenges, such as the unidentifiability of damaged files due to issues like media corruption and anti-forensic techniques. Moreover, the technological limitations of existing tools hinder the recovery of damaged files, posing difficulties in the evidence collection process. This paper aims to propose solutions for the recovery of corrupted MS Office files commonly used in digital data creation. To achieve this, we analyze the structure of MS Office files in the OOXML format and present a novel approach to overcome the limitations of current recovery tools. Through these efforts, we aim to contribute to enhancing the quality of evidence collection in the field of digital forensics by efficiently recovering and identifying damaged data.

• Proceedings of the Korea Information Processing Society Conference
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• 2001.10a
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• pp.503-506
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• 2001

본 논문에서는 획의 일부분이 손상된 숫자(broken digit)나 붙은 숫자(touching digits)와 같은 비정형 숫자들이 포함된 필기체 숫자 열을 인식할 수 있는 방법에 대하여 제안하였다. 비정형 숫자들은 분류(pre-segmentation) 단계에서 숫자들의 구조적인 특징 정보를 이용하여 정형인 개별 숫자(isolated digit)로부터 획의 일부분이 손상된 숫자 또는 붙은 숫자들로 분류된다. 획의 일부분이 분리된 숫자의 결합 및 붙은 숫자들의 분할 단계를 거쳐 인식을 시도하였다. 제안된 방법의 타당성을 증명하기 위하여 NIST SDl9 데이터베이스를 이용하여 시뮬레이션 해 보았다.

• Proceedings of the Korea Information Processing Society Conference
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• 2001.10a
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• pp.793-796
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• 2001

이동 통신 채널과 같이 에러 발생율이 놀은 환경에서 부호화된 비디오 스트림 전송시 발생된 에러는 비디오 화질에 큰 영향을 줄 수 있다. 본 논문에서 현재 널리 사용되고 있는 H.263 복호화기에서 전송도중 에러가 발생했을 경우 추가적인 데이터 삽입 없이 효율적으로 에러를 은닉한 수 있는 기법에 관하여 제안하였다. 특히 인터프레임 영상에서 손상되거나 손실된 움직임벡터에 대해 시간영역에서 관계가 깊은 이전 프레임에서 손실블록(매크로블록)과 같은 위치에 있는 블록의 움직임벡터와 현재 프레임에서 손실블록과 인접한 블록들의 움직임벡터 정보를 이용하여 손상된 블록에 대해 에러를 은폐시키는 방법을 제안한다. 기본적으로 손상된 매크로블록 주변에 인접한 화소값들을 움직임 벡터 추정에 사용한다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.11
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• pp.7329-7334
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• 2015

This is to analyze of driver behavioral and the accident characteristics in rollover. The study period was January 2011 to May 2014 and the subject of study was 102 person who were drivers visited the emergency room. Research tool includes a damage information of the vehicle, accident mechanism, damage to the patient clinical information with the injury data from the ROAD Traffic Authority. For data analysis, SPSS 18.0 was used for t-test, ANOVA and Chi-square test. Injury Severity Score average score according to the vehicle type is 6.00 points in the smaller vehicle, at high vehicle 11.78 points, from the other vehicle that showed 14.70 points. Significant differences between the three groups did not show (P=.267). Men did not use a seat belt significantly compared to women(P=.007). Vehicle type and weather, this was no correlation with whether or not use the seat belt(P=.755, P=.793). But showed a tendency to smaller size vehicles drivers do not use a seat belt, the weather could see a little more inclined to use a seat belt rather than a sunny day. Finally, in rollover accidents as in other types of accident it was confirmed that the seat belt has a great influence on the damage.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.38 no.4
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• pp.621-625
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• 2018

This paper proposes a method for bridge damage factor recognition from inspection reports using deep learning. Bridge inspection reports contains inspection results including identified damages and causal analysis results. However, collecting such information from inspection reports manually is limited due to their considerable amount. Therefore, this paper proposes a model for recognizing bridge damage factor from inspection reports applying Named Entity Recognition (NER) using deep learning. Named Entity Recognition, Word Embedding, Recurrent Neural Network, one of deep learning methods, were applied to construct the proposed model. Experimental results showed that the proposed model has abilities to 1) recognize damage and damage factor included in a training data, 2) distinguish a specific word as a damage or a damage factor, depending on its context, and 3) recognize new damage words not included in a training data.

• Journal of the Society of Disaster Information
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• v.8 no.1
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• pp.36-46
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• 2012

After the east Japan earthquake last March 2011, social interests are intensified in the area of increasing the earthquake resistant ability and the necessity of design method that can minimize the damage from earthquake. If bridges are damaged or collapsed, the social and economic effects are so severe that the evaluation of earthquake resistant ability becomes very important. The reviewing methods for earthquake resistant ability are many, but majority of these methods are deterministic. Thus, for the safety assessment of structures for earthquake, the method for evaluating fragility according to the stage of damage is necessary. In this paper, the fragility curves for PSC Box Girder bridge using LRB and RFPB are constructed for PGA, PGV, SA, SV, SI and the two isolators are compared.

• Proceedings of the Korea Information Processing Society Conference
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• 2000.04a
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• pp.1031-1036
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• 2000

지리정보시스템(Geographic Information System)분야에서 사회 기반 시설에 대한 요구가 증대되고, 시설물을 관리하기 위한 지리정보 데이터 베이스 구축이 필요하며, 데이터베이스 구축을 위해서는 지도 정보를 필요로 한다. 본 논문에서는 지도 정보를 자동으로 분석하여 등고선과 숫자, 기호를 추출해 내는 알고리즘에 대해 연구하였다. 지도상의 숫자, 기호를 추출하고 효율적으로 분류하기 위해 불필요한 자료를 제거하고 필요한 정보를 추출한 후 손상된 부분을 복원하는 방법과 필요한 정보만을 추출한 후 손상된 부분을 복원하는 방법을 제안하고 결과를 비교하였다. 이렇게 추출한 정보가 의미를 갖는 단위(기호, 숫자)들로 분류되도록 라벨링 방법과 무게 중심을 이용한 물체 추출 방법을 적용하여 숫자 기호들을 자동으로 분류하였으며, 여러 지역의 지형도를 입력하여 모의실험을 통해 제안한 알고리즘의 효율성을 증명하였다.

• Journal of the KSME
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• v.33 no.5
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• pp.414-420
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• 1993

원자력 발전소의 운전환경에 따른 노화손상은 발전소 운전 내력에 연류된다. 통상SCC는 40년 또는 40년 이하의 수명을 가정하여 이에 따른 설계 여유도나 안전 계수를 기초로 하여 설계된다. 그러나 설계여유도나 안전계수는 운전중 변경될 수도 있다. 원자력 발전소 기기의 변경될 수도 있다. 원자력 발전소 기기의 수명평가를 위해서는 초기설계치 및 잔여수명이나 실제 설계치의 변화 등을 평가하여야 한다. 주요 물성치 및 손상 매개변수의 실제 변경 상황은 수명기간 설정에 근간이 된다. SSC의 수명평가를 위해 재료의 노화손상은 철저히 파악되어야 한다. 또한 기계적 하중, 열적하중 등의 노화 촉진요인과 정상운전 및 시험도 노화손상에 영향을 미치므로 이들에 대해 상세 평가를 수행하여야 한다. 수명평가는 운전환경 및 노화촉진요인들과 밀접한 관련이 있으므로, SSC의 수명을 평가하기 위해서는 이러한 복잡한 변수들 사이의 연관관계를 구체적 으로 고려하여야 한다. 그러므로 SSC의 수명을 평가하기 위해서는 이러한 복잡한 변수들 사이의 연관관계를 구체적으로 고려하여야 한다. 그러므로 SSC의 설계, 제작, 설치, 시험, 운전상태 및 보수주기 등에 대한 정보파악이 선행되어야 한다.