Edge 분석과 ROI 기법을 활용한 콘크리트 균열 분석 - Edge와 ROI를 적용한 콘크리트 균열 분석 및 검사 -

박희원,이동은,Park, Heewon,Lee, Dong-Eun 한국건설관리학회 2024 건설관리 : 한국건설관리학회 학회지 Vol.25 No.2

This paper presents the application of Convolutional Neural Networks (CNNs) and Region of Interest (ROI) techniques for concrete crack analysis. Surfaces of concrete structures, such as beams, etc., are exposed to fatigue stress and cyclic loads, typically resulting in the initiation of cracks at a microscopic level on the structure's surface. Early detection enables preventative measures to mitigate potential damage and failures. Conventional manual inspections often yield subpar results, especially for large-scale infrastructure where access is challenging and detecting cracks can be difficult. This paper presents data collection, edge segmentation and ROI techniques application, and analysis of concrete cracks using Convolutional Neural Networks. This paper aims to achieve the following objectives: Firstly, achieving improved accuracy in crack detection using image-based technology compared to traditional manual inspection methods. Secondly, developing an algorithm that utilizes enhanced Sobel edge segmentation and ROI techniques. The algorithm provides automated crack detection capabilities for non-destructive testing.

측정법에 따른 갑상선자극호르몬 결합억제면역글로블린(TBII)의 임상적 유용성 검토

박희원,신희정,김태훈,노경운,김현주,Park, Hee-Won,Shin, Hee-Jung,Kim, Tae-Hoon,Noh, Gyeong-Woon,Kim, Hyun-Joo 대한핵의학기술학회 2009 핵의학 기술 Vol.13 No.3

서론 : 갑상선 기능 항진을 보이는 환자를 대상으로 항갑상선제 치료후 재발유무를 예측하거나 정확한 그레이브스병을 진단하기 위해 임상에서는 갑상선자극호르몬 결합악제면 역글로블린을 측정하는데 지금까지 1세대 liquid phase (RIA Precipitate)를 사용하였다. 그 후 예민도가 높아진 다음 세대 측정법이 다양하게 개발되었으며 실제 임상적 유용성이 보고되었다. 따라서 세대별 갑상선자극호르몬 결합억제면역글로블린 측정법 임상적 유용성 검토해 보고자 한다. 실험재료 및 방법 : 2009년 1월에서 3월까지 본원 강남건강증진센터에 내원한 환자 중 TSH, FT4, Microsome Ab 측정값이 정상범위에 드는 30명 (남자 20명, 여자 10명)을 대조군으로 하였다. 마찬가지로 2009년 1월에서 3월까지 본원 내분비내과를 내원한 환자 중 TSH<$0.05\;{\mu}IU/mL$, FT4>1.80 ng/dL인 갑상선기능항진증 진단을 받은 58명 (남자14명, 여자 44명)을 실험군으로 하였다. 측정법은 각 세대별로 1세대에서 3세대까지 각각 2가지종류의 시약을 사용하였으며, 확진 검사로 TS-Ab 검사를 실시하였다. 결과 : 대조군을 대상으로 각 세대별 측정법의 특이도를 확인하였다. (Specificity=100%, n=30) 실험군에서 민감도는 1세대 RSR<%> (79.3%, n=58), 1세대 RSR<cal.> (51.7%, n=58), 2세대 RSR-CT (93.1%, n=58), 2세대 BRAHMS-CT (98.3%, n=58), 3세대 ELISA (94.6%, n=56), 3세대 ECLIA (97.7%, n=58), TS-Ab<%> (93.5%, n=46)이었다. 결론 : 갑상선자극호르몬 결합억제면역글로블린 측정법의 세대별 검토 결과 TS-Ab(%)를 확진 검사로 기준했을 때 3세대 ECLIA에 대해 2세대 BRAHMS-CT 측정법이 가장 높은 상관성을 보였다($R^2$=0.923). 따라서 기존에 사용했던 1세대 측정법을 대신하여 2세대 측정법을 사용함으로써 보다 정확하고 신속한 결과보고에 유용할 것으로 판단된다. Purpose: Detection of TSH-binding inhibitor immunoglobulin (TBII) in patients with hyperthyroidism is an important result of Graves' disease (GD) and hyperthyroidism treatment. This has been made out an inspection by commercial radio-receptor assays. To increase the sensitivity and the specificity of the assay, many results of the assay were reported. In this study we evaluated the clinical usetulness of TBII assays by the Comparative method. Material and Methods: We were measured by using healthy control group (n=30, male=20, female=10) of Seoul National University Hospital Healthcare System Gangnam Center from January to March in 2009. Similarly, We were measured by using hyperthyroid (TSH<$0.05\;{\mu}IU/mL$, FT4>1.80 ng/dL) experimental group (n=58, male=14, female=44) of division of endocrinology and metabolism department of internal medicine Seoul National University Hospital from January to March in 2009. We made a comparative study of each two assays from the first generation to the third generation. We were used of TSAb assay as a measurement of GD diagnostic technique. Results: The specificity of healthy control group was 100% according to the generation. (Specificity=100%, n=30) The sensitivity of hyperthyroid experimental group were the first generation RSR<%> (79.3%, n=58), RSR<cal.> (51.7%, n=58), the second generation RSR-CT (93.1%, n=58), BRAHMSCT (98.3%, n=58), the third generation ELISA (94.6%, n=56), ECLIA (97.7%, n=58) and TS-Ab<%> (93.5%, n=46). Conclusion: We were used of TSAb assay as a measurement of GD diagnostic technique, The result of data showed a high correlation between the third generation TBII assay and the second generation TBII assay ($R^2$=0.923). Instead of the first generation assay, the second generation assay can be more useful in clincal diagnosis.

자율관리 마을어업의 생태계 기반 자원관리시스템 연구

박희원,장창익 한국어업기술학회 2008 수산해양기술연구 Vol.44 No.4

A self-regulatory community fisheries management program in Korea is designed to enhance fisheries resources, to protect fishing grounds of self-regulatory communities, and to manage their fisheries resources by their own regulations and knowledge. This study explored an applicable ecosystem-based management plan based on the scientific investigation and analysis. This study suggested objectives, indicators and reference points of the ecosystem-based resource management system which are applicable to selfregulatory community fisheries. The objectives of the management system are to maintain sustainable fisheries production, to maintain optimum fishing intensity, to reduce by-catch, to conserve spawning ground and habitat, to maintain optimum habitat environment, to increase/maintain abundance of prey species, to increase/maintain stock biomass, and to conduct stock enhancement on the basis of scientific assessment. The improved methods for the assessment and management are introduced by demonstrating a self-regulatory fishery which targets on hen clam in Dong-li fishing village in Busan.

비모수 회귀분석을 이용한 실시간 통행시간예측에 관한 연구

박희원,박창호,전경수,이성모(Sung Mo Rhee) 대한교통학회 1999 대한교통학회 학술대회지 Vol.36 No.-

화재모델링을 위한 정온식 열감지기의 장치물성 측정

박희원,조재호,문선여,박충화,황철홍,김성찬,남동군 한국화재소방학회 2014 한국화재소방학회논문지 Vol.28 No.1

The high predictive performance of fire detector models is essentially needed to assure the reliability of fire and evacuationmodeling in the process of Performance-Based fire safety Design (PBD). The main objective of the present study isto measure input information in order to predictive the accurate activation time of fixed temperature heat detectorsadopted in Fire Dynamics Simulator (FDS) as a representative fire model. To end this, Fire Detector Evaluator (FDE)which could be measured the device properties of detector was used, and the spot-type fixed temperature heat detectors oftwo thermistor types and one bimetal type were considered as research objectors. Activation temperature and ResponseTime Index (RTI) of detectors required for the fire modeling were measured, and then the RTI was measured for ceilingjet flow and vertical jet flow in consideration of the install location of detectors. The results of fire modeling using measureddevice properties were compared and validated with the experimental results of full-scale compartment fires. It wasconfirmed that, in result, the numerically predicted activation time of detector showed reasonable agreement with themeasured activation time. 성능위주 소방설계(PBD)의 과정에서 화재 및 피난모델링의 신뢰성을 확보하기 위해서는 화재감지기 모델의 높은 예측성능이 필수적으로 요구된다. 본 연구의 목적은 대표적인 화재모델인 FDS에 적용되고 있는 정온식 열감지기의 정확한작동 개시시간을 예측하기 위한 입력정보를 측정하는 것이다. 이를 위해 화재감지기의 장치특성을 측정할 수 있는 FireDetector Evaluator (FED)가 사용되었으며, 국내에서 적용되는 2개의 써미스터 방식(Thermistor types)과 1개의 바이메탈 방식(Bimetal type)의 스포트형 정온식 열감지기가 연구대상으로 고려되었다. 화재모델링을 위해 요구되는 감지기의작동 개시온도 및 반응시간지수(Response Time Index)가 측정되었으며, 이때 RTI는 감지기의 설치위치를 고려하여 천장제트기류(Ceiling jet flow)와 수직제트기류(Vertical jet flow)에 대하여 측정되었다. 측정된 장치물성을 이용한 화재모델링 결과는 실규모 구획화재실험 결과와 비교·검증되었다. 그 결과 수치적으로 예측된 감지기의 작동 개시시간은 실험결과를 적절히 잘 예측함을 확인하였다.

서울시 환경요인과 월별 뇌혈관 질환 사망자의 연관성

박희원,이종협 한국자료분석학회 2009 Journal of the Korean Data Analysis Society Vol.11 No.2

In this paper, we investigate the association between environmental factors and monthly mortality of cerebrovascular disease over 10 years (January 1995 - December 2004) in Seoul. We show that monthly cerebrovascular mortality has a negative binomial distribution using Kolmogorov-Smirnov test. To determine lag effects of environmental factors upon monthly mortality, we compare the relative risks of six different lag models with a maximum lag of 5 months. We also conduct correlation analysis for each environmental factor with its lagged variables and monthly mortality. We employ a negative binomial regression model to regress monthly cerebrovascular-disease death counts for four air pollutants, temperature and relative humudity, controlling for long-term and seasonal trends. We conclude that 4-month and 5-month lagged concentration of O_3 and 4-month lagged relative humidity are significant risk factor for cerebrovascular mortality. 본 연구는 환경요인과 한국인의 3대 주요사인으로 알려진 뇌혈관 질환 사망자 사이의 연관성을 규명하기 위해 1995년 1월부터 2004년 12월까지의 서울시 월별 뇌혈관 질환 사망자 자료와 대기오염물질(SO_2, O_3, NO_2, PM_10), 기상변수(평균기온, 평균상대습도)를 사용하여 분석을 실시하였다. 분석에 앞서 콜모고로프-스미르노프 검정을 통해 서울시 월별 뇌혈관 질환 사망자가 음이항 분포를 따름을 검정하고, 기본 모형 하에서 6가지 환경요인들에 대한 최대 5개월간의 시차변수들의 상대위험을 비교하였다. 환경요인과 사망자 사이에 교락요인으로 작용할 수 있는 추세성분과 계절성분을 조정하고, 환경요인들의 지연효과를 고려하기 위해 환경요인의 시차변수들을 음이항 회귀모형에 고려하여 분석을 실시하였다. 분석결과 오존, 평균상대습도가 서울시 월별 뇌혈관 질환 사망자에 유의한 영향을 미치고 있는 것으로 나타났다.

Reliability and Validity of a New Method for Isometric Back Extensor Strength Evaluation Using A Hand-Held Dynamometer

박희원,백소라,김홍영,박중교,강은경 대한재활의학회 2017 Annals of Rehabilitation Medicine Vol.41 No.5

Objective To investigate the reliability and validity of a new method for isometric back extensor strength measurement using a portable dynamometer.Methods A chair equipped with a small portable dynamometer was designed (Power Track II Commander Muscle Tester). A total of 15 men (mean age, 34.8±7.5 years) and 15 women (mean age, 33.1±5.5 years) with no current back problems or previous history of back surgery were recruited. Subjects were asked to push the back of the chair while seated, and their isometric back extensor strength was measured by the portable dynamometer. Test-retest reliability was assessed with intraclass correlation coefficient (ICC). For the validity assessment, isometric back extensor strength of all subjects was measured by a widely used physical performance evaluation instrument, BTE PrimusRS system. The limit of agreement (LoA) from the Bland-Altman plot was evaluated between two methods.Results The test-retest reliability was excellent (ICC=0.82; 95% confidence interval, 0.65–0.91). The Bland-Altman plots demonstrated acceptable agreement between the two methods: the lower 95% LoA was −63.1 N and the upper 95% LoA was 61.1 N.Conclusion This study shows that isometric back extensor strength measurement using a portable dynamometer has good reliability and validity.

빌딩에 작용하는 공력 특성의 통계 분석

박희원,유바라지 나타라잔,김법렬 한국공간구조학회 2019 한국공간구조학회지 Vol.19 No.4

[P-5] 먹이생물 은편모류 농도와 수온에 따른 기수산 윤충류 Brachionus plicatilis의 성장과 은편모류 종주별 농도에 따른 섭식

박희원,안예지,김병호,윤상선,김형섭,조수근 한국수산과학회 양식분과 2011 한국수산과학회 양식분과 학술대회 Vol.2011 No.6

청평호 모래무지의 생태학적 특성치

박희원,송하윤,송미영,이완옥,김봉석 한국수산과학회 양식분과 2017 한국수산과학회 양식분과 학술대회 Vol.2017 No.5