http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
임의 위치 구조물의 손상예측을 위한 인공지능 기반 지진가속도 추정방법
이경석,서영득,백은림,Kyeong-Seok Lee,Young-Deuk Seo,Eun-Rim Baek 한국구조물진단유지관리공학회 2023 한국구조물진단유지관리공학회 논문집 Vol.27 No.3
It is not efficient to install a maintenance system that measures seismic acceleration and displacement on all bridges and buildings to evaluate the safety of structures after an earthquake occurs. In order to maintain this, an on-site investigation is conducted. Therefore, it takes a lot of time when the scope of the investigation is wide. As a result, secondary damage may occur, so it is necessary to predict the safety of individual structures quickly. The method of estimating earthquake damage of a structure includes a finite element analysis method using approved seismic information and a structural analysis model. Therefore, it is necessary to predict the seismic information generated at arbitrary location in order to quickly determine structure damage. In this study, methods to predict the ground response spectrum and acceleration time history at arbitrary location using linear estimation methods, and artificial neural network learning methods based on seismic observation data were proposed and their applicability was evaluated. In the case of the linear estimation method, the error was small when the locations of nearby observatories were gathered, but the error increased significantly when it was spread. In the case of the artificial neural network learning method, it could be estimated with a lower level of error under the same conditions.
이경석,도재원,윤석만,배학근,윤일규,Lee, Kyeong-Seok,Doh, Jae-Won,Yoon, Seok-Mann,Bae, Hack-Gun,Yun, Il-Gyu 대한신경외과학회 2000 Journal of Korean neurosurgical society Vol.29 No.7
Objective : Traumatic disc lesion is a lesion with tremendous controversies. The causal relationships of this lesion are not established along with pathogenesis, diagnostic criteria, methods of treatment and the outcome. However, a significant number of patients with back pain after a trauma underwent spinal operations under the diagnosis of traumatic disc lesions. Such an ill-directed operation eventually produce a person with an iatrogenic disability. We present two illustrative cases, and tried to make a preventive method. Methods : We examined the path from mild trauma after a road traffic accident into the iatrogenic disability in two illustrative cases, who requested disability assessment and medical appraisement. We evaluated the reason and background for such an unwanted outcome and tried to find a method to reduce or prevent it by a literature review. Results : These two patients were admitted to the hospital with the diagnosis of lumbar sprain after a road traffic accidents. They eventually underwent spinal surgery under another diagnosis such as traumatic disc herniation or internal disc disruption. They stayed at the hospital for more than six months and finally lost their jobs. They became the disabled at last. Although they complained back pain, they never insisted by themselves that their symptoms were due to the traumatic disc lesion. To prevent such an iatrogenic disability, the doctors should assist them to go-back to the workplace promptly instead of a reckless extension of the treatment period. It may be necessary to evaluate the certificates to extend the treatment period with an additional diagnosis by a medical expert. To reduce the unnecessary long-term admission, a new billing system such as a partial share for the high cost of the treatment by the patients may be needed. Conclusion : It is not the patient but the doctors, who has the responsibility to avoid the unnecessary operations. All treating doctors should try to reduce or prevent such an iatrogenic complication caused by ourselves before we are forced to do so.
요통 및 좌골신경통 환자의 치료결과 : 수면장애 및 피로감과 자각적 통증 및 장애정도의 관계
이경석,윤석만,도재원,배학근,윤일규,Lee, Kyeong-Seok,Yoon, Seok-Mann,Doh, Jae-Won,Bae, Hack-Gun 대한신경외과학회 2000 Journal of Korean neurosurgical society Vol.29 No.3
Objective : Psychological factors may have a major influence on the outcome of treatment for back pain. We investigated the relationship between the outcome and some psychological factors, such as self-reported pain intensity, disability, sleep disturbance and fatigue. Method : The study was conducted as a survey using a questionnaire and telephone interviews. The survey included consecutive 294 patients who visited the neurosurgical out-patient department complaining of low back pain and contacted by telephone on average seven months after the first visit. Pain intensity was measured by visual analog scale, and disability was assessed by Waddell's chronic disability index. Results : The outcome of treatment for back pain was recovered in 36.7%, improved in 30.6%, almost same in 28.6%, and aggravated in 4.1%. Overall rate of improvement was 67.3%. The rate of improvement was related to the duration, patterns and intensity of the symptom, and Waddell index. It was not influenced by the doctors, special studies, and methods of treatment. When the duration was more than 6 months, there were the symptoms of both back and legs, and the self-reported Waddell index was 1-3, the rate of improvement was relatively low. Although the intensity of the pain and disability was closely related to the degree of sleep disturbance, fatigue, appetite, or indigestion, the outcome of treatment for back pain was not always bad in patients with high psychological stress. Actually the outcome of the patients who complained severe pain and disability was better than the outcome of the others. Conclusion : The outcome of the back pain can be predicted by the duration, patterns and intensity of the symptom, and Waddell index. The multidisciplinary treatment will be necessary for the patients whose expected outcome is not good to reduce not only the physical symptoms but also the psychological stress.
대한신경외과학회지에 발표된 요통 환자의 치료결과 평가방법
이경석,도재원,윤석만,배학근,윤일규,Lee, Kyeong-Seok,Doh, Jae-Won,Yoon, Seok-Man,Bae, Hack-Gun,Yun, Il-Gyu 대한신경외과학회 2001 Journal of Korean neurosurgical society Vol.30 No.5
Objectives : Criteria for evaluating the results of treating low back pain vary widely. We examined the methods measuring the outcome in the papers of Journal of Korean Neurosurgical Society. Methods : We selected all published articles describing the methods measuring the outcome of low back pain in the journal. They were classified into 3 periods such as period 1 for volume 1-20, 2 for volume 21-25, and 3 for volume 26-28. Results : There are 25 articles in period 1, 44 in period 2, and 30 in period 3. The outcome was classified into 0 to 5 classes by more than 15 different methods. Although the terms and descriptive criteria differ, 4 classes were the most common classification, being 16 in period 1, 39 in period 2, and 19 in period 3. The outcome was usually measured by authors' own method in period 1. In period 2, criteria by Gill et al was most commonly used along with many different criteria. Criteria by Prolo et al became a common method in period 3. Conclusion : Varying methods compromised comparative analyses of outcome. A more simple and universally applicable criteria is necessary to facilitate comparisons among various methods of treatment.
이경석 ( Lee Kyeong-seok ),서영득 ( Seo Young-deuk ),최형석 ( Choi Hyoung-suk ) 한국구조물진단유지관리공학회 2021 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.25 No.1
지진이 발생하면 시설물의 관리자는 구조물의 피해발생 여부를 조사하고 긴급복구를 실시하는 등 대응을 수행할 책임이 있다. 그러나 교량 및 건축물과 같은 대형의 사회기반시설에 대해서 지진발생 후 소수의 관리인원이 제한된 시간 내에 다수구조물의 지진피해를 확인하고 안전성을 평가하는데는 어려움이 있다. 국내에서는 지진재해대응시스템이 개발되어 있으나 확률론적 안전성 평가방법을 적용하고 있어 개별 시설물에 대한 피해 정도를 제공하지는 못하는 실정이다. 이에 본 연구에서는 중, 소형시설물의 지진피해평가·관리시스템을 개발함으로써 지진재해 발생 후 관리자에게 구조물의 피해발생 여부, 긴급점검 등 유지관리활동의 필요유무 정보를 제공하고자 한다.
이경석 ( Lee Kyeong-seok ),서영득 ( Seo Young-deuk ),최형석 ( Choi Hyoung-suk ) 한국구조물진단유지관리공학회 2021 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.25 No.1
지진이 발생하면 시설물의 관리자는 구조물의 피해발생 여부를 조사하고 긴급복구를 실시하는 등 대응을 수행할 책임이 있다. 그러나 교량 및 건축물과 같은 대형의 사회기반시설에 대해서 지진발생 후 소수의 관리인원이 제한된 시간 내에 다수구조물의 지진피해를 확인하고 안전성을 평가하는데는 어려움이 있다. 국내에서는 지진재해대응시스템이 개발되어 있으나 확률론적 안전성 평가방법을 적용하고 있어 개별 시설물에 대한 피해 정도를 제공하지는 못하는 실정이다. 이에 본 연구에서는 중, 소형시설물의 지진피해평가·관리시스템을 개발함으로써 지진재해 발생 후 관리자에게 구조물의 피해발생 여부, 긴급점검 등 유지관리활동의 필요유무 정보를 제공하고자 한다.
이경석(Kyeong Seok Lee),조호묵(Ho Mook Cho) 한국컴퓨터정보학회 2020 한국컴퓨터정보학회 학술발표논문집 Vol.28 No.2
본 논문에서는 IoT 취약점 탐지 시스템과 취약점 데이터베이스 구축 방안을 제안한다. 동적 웹페이지 제어기술 기반의 크롤링 기법으로 펌웨어를 수집한 후, 패킹된 펌웨어 파일을 Binwalk, FMK를 활용하여 추출하고 Qemu 에뮬레이팅 기반의 실제 서비스를 실행시키는 시스템을 구현하여 펌웨어 취약점을 탐지할 수 있는 환경을 구축한다. 구축된 시스템을 통하여 수집, 추출, 에뮬레이팅 과정에서 생성된 데이터와 연계되어 탐지된 취약점 정보를 저장할 수 있는 데이터베이스를 제안한다. 제안된 시스템과 데이터베이스를 통하여 IoT 기기 펌웨어의 취약점을 탐지하고 예방을 할 수 있을 것이라 기대한다.
이경석 ( Lee Kyeong-seok ),서영득 ( Seo Young-deuk ),최형석 ( Choi Hyoung-suk ) 한국구조물진단유지관리공학회 2021 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.25 No.1
지진으로 인한 구조물의 피해를 예측하는 방법 중 발생한 지진가속도 시간이력을 활용한 동적해석법이 가장 정확한 것으로 알려져 있다. 그러나 대부분의 구조물은 경제적인 이유로 지진가속도계가 설치되어있지 않으므로 동적해석법을 활용하기 어렵다. 이에 기존 선형추정방법을 통한 지진가속도 시간이력 생성 알고리즘이 제시되었으나 지반증폭 등 비선형 요인을 고려하지 못함에 따라 정확도가 부족한 문제가 있었다. 본 연구에서는 임의의 위치에서 발생한 지진가속도를 예측하기 위해 인근 가속도 관측자료를 활용한 심층신경망 분석방법을 제안하고 예측결과를 실제 발생한 가속도이력과 비교 분석하였다.
이경석 ( Lee Kyeong-seok ),서영득 ( Seo Young-deuk ),최형석 ( Choi Hyoung-suk ) 한국구조물진단유지관리공학회 2021 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.25 No.1
지진으로 인한 구조물의 피해를 예측하는 방법 중 발생한 지진가속도 시간이력을 활용한 동적해석법이 가장 정확한 것으로 알려져 있다. 그러나 대부분의 구조물은 경제적인 이유로 지진가속도계가 설치되어있지 않으므로 동적해석법을 활용하기 어렵다. 이에 기존 선형추정방법을 통한 지진가속도 시간이력 생성 알고리즘이 제시되었으나 지반증폭 등 비선형 요인을 고려하지 못함에 따라 정확도가 부족한 문제가 있었다. 본 연구에서는 임의의 위치에서 발생한 지진가속도를 예측하기 위해 인근 가속도 관측자료를 활용한 심층신경망 분석방법을 제안하고 예측결과를 실제 발생한 가속도이력과 비교 분석하였다.