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정적 변형률 데이터를 사용한 CNN 딥러닝 기반 PSC 교량 손상위치 추정
한만석,신수봉,안효준,Han, Man-Seok,Shin, Soo-Bong,An, Hyo-Joon 한국BIM학회 2020 KIBIM Magazine Vol.10 No.2
As the number of aging bridges increases, more studies are being conducted on developing effective and reliable methods for the assessment and maintenance of bridges. With the advancement in new sensing systems and data learning techniques through AI technology, there is growing interests in how to evaluate bridges using these advanced techniques. This paper presents a CNN(Convolution Neural Network) deep learning based technique for evaluating the damage existence and for estimating the damage location in PSC bridges using static strain data. Simulation studies were conducted to investigate the proposed method with error analysis. Damage was simulated as the reduction in the stiffness of a finite element. A data learning model was constructed by applying the CNN technique as a type of deep learning. The damage status and its location were estimated using data set built through simulation. It was assumed that the strain gauges were installed in a regular interval under the PSC bridge girders. In order to increase the accuracy in evaluating damage, the squared error between the intact and measured strains are computed and applied for training the data model. Considering the damage occurring near the supports, the results of error analysis were compared according to whether strain data near the supports were included.
금호강 (琴湖江) 수계 (水系) 저서성 (底棲性) 대형무척추동물(大型無脊椎動物) 군집의(群集) 시공간적 분포
윤일병,공동수,원두희 ( Il Byong Yoon,Dong Soo Kong,Doo Hee Won ) 한국하천호수학회 1992 생태와 환경 Vol.25 No.3
The benthic macroinvertebrate 110 species, 8 classes in 5 Phyla occurred in Keumho river on October, 1990 to March, 1992 (Planaria 1, Nematoda 2, Oligochaeta 3, Hirudinea 11, Gastropoda 9, Pelecypoda 5, Crustacea 2, Insecta 77 species). Species frequency numbers were very different according to survey sites from 60 in upper zone to 11 at lower zone. Taxa with high species frequency were Insecta except Diptera at upper zone, Hirudinea at middle, and Diptera and Oligochaeta at lower zone. Species frequency of Ephemeroptera and Trichoptera on October and November in 1990 increased compared to that of same period in 1990. Mean abundance in this river was 424 Inds./(0.5m^2 as annual level, and Ephemeroptera occupy 29.5%, Diptera 24.5%, Annelida 23.0%, and Crustacea 13.8%. Abundances were variant from 820 Inds./0.5m^2 at site 12 (Tonghwa stream) to 38 Inds./0.5 m^2 at site 16(lowest site in main branch). Dominant taxa were Serratella rufa at Site 1 and Site 12, Baetis nla at Site 2 and Site 3 (Shillyong stream), Asellus hilgendorfi at Site 4 and Site 5, Limnodrilus socialis at Site 9 (Namcheon stream) and Site 14, Chironomus at Site 10, Site 11 and Site 13. Abundances of Oligochaeta and Asellus hilgendorfi decreased after April in 1991 and June in 1991 respectively, but that of Ephemeroptera, Trichoptera, and Pelecypoda increased after September in 1991, but other taxa were not variant seasonally. In Spearman correlation based on abundance, Limnodrilus socialis and Chironomus showed negative relation with other taxa, Caenis KUa and Baetis nla showed high positive correlation each other. In Bray-Curtis polar ordination with percent dissimilarity based on species frequency, Hydropsyche and Cheumatopsyche seem to be a little intolerant taxa, and Ecdyonurus yoshidae and Serratella rufa - a little tolerant taxa -, Glossiphoniidae, Erpobdelliidae, Asellus hilgendorfi, Caenis KUa, and Baetis nla -tolerant taxa -, Limnodrilus socialis and Chironomus - very tolerant taxa -. One cluster appeared by group mean and unweighted pair-grouping with SØrensen`s similarity coefficient among sites. Clustered sites were more or less clean and not-clustered sites (Site 9, 10, 11, 14, 16) were severely polluted.
임하댐 주변 유역(반변천, 길안천 및 낙동강 수역)에서 물리 화학적 서식처와 부착규조류 군집
김용재 ( Yong Jae Kim ),원두희 ( Doo Hee Won ) 한국환경생물학회 2011 환경생물 : 환경생물학회지 Vol.29 No.3
In this study, We were investigated the interrelationships between epilithic diatom communities and physico chemical factors at Banbyeon stream, Gilan stream and Nakdong river in the Lake Imha basin from September 2008 to June 2009. Epilithic diatom communities were identified a total 120 taxa which were composed to 2 Orders, 3 Suborders, 7 Families, 22 Genera, 108 species and 12 varieties. The dominant species were 4 taxa, which were Achnanthes alteragracillima, A. convergens, A. minutissima and Fragilaria construens var. venter during the investigation periods at 8 sites. Correlation coefficients between epilithic diatom communities and physicochemical factors were from 0.94 to 0.97. Correlation coefficients (r) between turbidity, QHEI and density, species number and indices of diatom communities were from 0.18 to 0.42 which was showed lower values than the values of chemical factors. Correlation coefficients (r) between QHEI and Epilithic diatom communities were showed the low values. Correlation coefficients (r) between TP and diatom indices (DAIpo, TDI) were 0.79 and 0.78, respectively. Therefore, epilithic diatom communities were greatly influenced by TP.
경기도 가평천의 하순에 따른 수서곤충 군집조성과 섭식기능군
배연재 ( Yeon Jae Bae ),원두희 ( Doo Hee Won ),황득휘 ( Duc Huy Hoang ),진영헌 ( Young Hun Jin ),황정미 ( Jeong Mi Hwang ) 한국하천호수학회 2003 생태와 환경 Vol.36 No.1
Community composition and functional feeding groups of aquatic insects according to stream order were investigated from the Gapyeong Creek, a typical mid-sized Korean stream in Gyeonggi-do, Korea, in April 2000. For field investigations, the main watercourse and three major tributaries of the stream that belong to stream order Ⅱ to Ⅶ were divided into reaches (ca. 1~4 km in distance). Aquatic insects were sampled from one or two sites each reach (total 30 sites) using a Surber sampler(50×50cm, mesh 0.75mm). As a result of the quantitative samplings (two Surber samplings at riffle and pool/run per site; total 2×30=60 Surber samplings) and additional qualitative samplings, a total of 164 species of aquatic insects in 103 genera, 54 families, and 8 orders were collected from the stream. Those aquatic insects were composed of Trichoptera (56 spp.: 34.1%), Ephemeroptera (43 spp.: 26.2%), Diptera (25 spp.: 15.2%), Plecoptera (23 spp.: 14.0%), Coleoptera (6 spp.: 3.7%), Odonata (6 spp.: 74.4%) or EPT-group plus Diptera 9147 spp.: 89.6%) occupied most of the aquatic insect community; relatively larger number of species occurred in the mid-stream reaches (order Ⅲ-Ⅵ). The quantitative samplings throughout the study sites yielded a total of 26,286 individuals of aquatic insects (136~2522 inds./0.5㎡, mean 906.4 inds./0.5㎡) that belongs to Ephemeroptera (11,994 inds.: 45.6%), Diptera (8730 inds.: 33.2%), Trichoptera (4123 inds. : 15.7%), Plecoptera (1213 inds.: 4.6%), Coleoptera (204 inds.: 0.8%), Odonata (13 inds.: 0.05%), Megaloptera (5 inds.: 0.02%), and Hemiptera (4 inds.: 0.02); average number of individuals of aquatic insects increased as the stream order increased; average numbers of individuals of Plecoptera and Trichoptera decreased and increased, respectively, as the stream order increased. Tolerant species such as Chironomidae spp., Uracanthella rufa, and Hydropsychidae spp. were particularly abundant in the down stream reaches (order Ⅶ). Species diversity indices (H`) and dominance indices (DI) were relatively higher and lower, respectively, in the mid-stream reaches (order Ⅳ~ Ⅵ). Shredders occupied the smallest part and collector-gatherers were most abundant among the functional feeding groups(FFGs); collector-filterers considerably increased in the down stream reaches (orders Ⅵ and Ⅶ); scrappers were relatively evenly distributed throughout the stream reaches; predators were relatively more abundant in the uppermost stream reaches (order Ⅱ).
논 생태계에 서식하는 생물과 긴꼬리투구새우가 분비한 화학물질이 물벼룩의 생활사와 형태에 미치는 영향
나긍환 ( Geung Hwan La ),한은진 ( Eun Jin Han ),원두희 ( Doo Hee Won ),김정희 ( Jeong Hui Kim ),정쥬리 ( Jyoo Ri Jeong ),김현우 ( Hyun Woo Kim ) 한국하천호수학회(구 한국육수학회) 2015 생태와 환경 Vol.48 No.4
The aim of this study was to assess the interaction between Daphnia similis and various organisms related to the rice paddy ecosystem. We selected several organisms that are likely to prey on D. similis and evaluate predation rate as well as responses of D. similis to the chemical compounds exuded by these organisms. As a result of predation experiment, larval dragonfly (Anax parthenope) and Triops longicaudatus were clearly shown decreasing abundances of D. similis. Especially, Triops longicaudatus was observed higher feeding rates on D. similis than larval dragonfly. Chemical compounds from the vertebrates such as fish (Misgurnus anguillicaudatus, Pseudorasbora parva, Micropterus salmoides) and tadpole of frog (Rana nigromaculata) did not affect the life history of Daphnia. However, a potential predatory fish P. parva induced significantly longer tail spine in Daphnia. In addition, among the invertebrates (T. longicaudatus, A. Parthenope, Micronecta spp., Palaemon paucidens), chemical compounds exuded by T. longicaudatus induced shorter body and significantly longer tail spine in D. similis.