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Localizing structural damage based on auto-regressive with exogenous input model parameters and residuals using a support vector machine based learning approach

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Frontiers of Structural and Civil Engineering 2024年第10期18卷 1492-1506页

作者： burcu GUNES Department of Civil Engineering Istanbul Technical UniversityIstanbul 34467Turkey

Machine learning algorithms operating in an unsupervised fashion has emerged as promising tools for detecting structural damage in an automated *** essence relies on selecting appropriate features to train the model using the reference data set collected from the healthy structure and employing the trained model to identify outlier conditions representing the damaged *** this paper,the coefficients and the residuals of the autoregressive model with exogenous input created using only the measured output signals are extracted as damage *** features obtained at the baseline state for each sensor cluster are then utilized to train the one class support vector machine,an unsupervised classifier generating a decision function using only patterns belonging to this baseline *** damage,once detected by the trained machine,a damage index based on comparison of the residuals between the trained class and the outlier state is implemented for localizing *** two-step damage assessment framework is first implemented on an eight degree-of-freedom numerical model with the effects of measurement noise ***,vibration data collected from a one-story one-bay reinforced concrete frame inflicted with progressive levels of damage have been utilized to verify the accuracy and robustness of the proposed methodology.

关键词： structural health monitoring damage localization auto-regressive with exogenous input models one-class support vector machine reinforced concrete frame

Redox active polymer metal chelates for use in flexible symmetrical supercapacitors:Cobalt-containing poly(acrylic acid)polymer electrolytes

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Journal of Energy Chemistry 2021年第4期30卷 145-153页

作者： Emre Cevik ayhan Bozkurt Department of Genetics Research Institute for Research and Medical Consultations(IRMC)Imam Abdulrahman Bin Faisal UniversityDammam 31441Saudi Arabia Department of Biophysics Institute for Research and Medical Consultations(IRMC)Imam Abdulrahman Bin Faisal UniversityDammam 31441Saudi Arabia

The novel polymer metal chelate electrolytes(polychelates)were prepared by incorporation of cobalt sulfate(Co)into poly(acrylic acid)(PAA)host ***-solid state supercapacitor devices were fabricated using polychelates,PAA-Co X(X:3,5,7,and 10)where X represents the doping fraction(w/w)of Co in *** polymer metal electrolytes were showed excellent bending-stretching properties,thermal stability and electrochemical durability with an optimum ionic conductivity of 3.15×10^(-4) S cm^(-1).Hierarchically porous activated carbon and nano-sized conductive carbon were used to form carbon composite symmetrical device *** electric double-layer capacitor(EDLC)and redox reactions of Co-incorporated polychelates at the interfaces of porous activated carbon provided an optimum specific capacitance of 341.33 F g^(-1) with a device of PAA-Co7,which is at least 15 times enhancement compared to the device of pristine *** PAA-Co7 device also provided energy density of 21.25 Wh kg^(-1) at a power density of 117.69 W kg^(-1).A prolonged cyclic stability of the device exhibited superior capacitive performance after 10,000 charge-discharge cycles and the maintained 90%of its initial *** addition,the supercapacitor with a dimension of 1.5 cm×3 cm containing PAA-Co7 successfully operated the red-blue-green(RGB)LED light.

关键词： Supercapacitor Redox active supercapacitor Cobalt Poly(acrylic acid) Polymer electrolyte

RELAXED ELASTIC LINES OF SECOND KIND ON ORIENTED SURFACE IN MINKOWSKI SPACE

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Applied Mathematics and Mechanics(English Edition) 2006年第11期27卷 1481-1489页

作者： ayhan TUTAR ayhan SARIO■LUG■L Ondokuz Mayis University Faculty of Science and ArtsDepartment of MathematicsKurupelit-Samsun55139Turkey

The relaxed elastic line of second kind on an oriented surface in the Minkowski space was defined and for the relaxed elastic line of second kind which is lying on an oriented surface the Euler-Lagrange equations were derived. Furthermore, whether these curves lie on a curvature line or not was investigated and some applications were given.

关键词： elastic line geodesic Minkowski space Euler-Lagrange equations

Quality of life after colorectal surgery:A prospective study of patients compared with their spouses

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World Journal of Gastrointestinal Surgery 2021年第9期13卷 1050-1062页

作者： Gökçe Aylaz Cihangir Akyol Akın Fırat Kocaay Derya Gökmen Ayşe burcu Yavuzarslan ayhan Bülent Erkek Mehmet ayhan Kuzu Department of Surgery Sisli Memorial HospitalIstanbul 34385Turkey Department of Surgery Ankara University School of MedicineAnkara 06100Turkey Department of Biostatistics Ankara University School of MedicineAnkara 06100Turkey

BACKGROUND Although radical surgery for colorectal cancer improves the oncological outcomes,a significant portion of patients suffer from alterations in their quality of life(QoL).There are many studies investigating the QoL of patients who have colorectal cancer but none of these focus on the QoL of *** To compare the QoL of patients after colorectal surgery to the QoL of *** This prospective study consisted of patients who were married and who underwent surgery at the University of Ankara,Department of Surgery between March 2006 and November ***’spouses were also *** study was approved by the Ethics Committee of the Faculty of Medicine,Ankara University,and all patients provided written informed *** study included patients who underwent curative surgery for colorectal carcinoma[n=100;abdominoperineal excision(n=33),low anterior resection(n=33),left hemicolectomy(n=34)]and their spouses(n=100).The patients and spouses completed the Medical Outcome Study 36-item Short Form Survey(SF-36)and the World Health Organization Disability Assessment Schedule II(WHODAS-II)preoperatively and at postoperative months 15 to *** During this 4.5-year study period,273 patients with sigmoid or rectal cancer were admitted to the *** these patients,119 were eligible and willing to *** patients had either systemic or locally inoperable disease,three patients had a severe surgical complication,and five patients were lost to ***,a total of 100 patients completed the follow-up *** was a statistically significant positive correlation between the disability scores of patients and the scores of their spouses for some of the WHODAS-II subscales,such as“self-care,”“life activities,”and“participation in society,”as well as for the total WHODAS-II *** was also a positive correlation between the QoL of patients and the QoL of their spouses in most of the SF-36 *** signif

关键词： Quality of life Colorectal surgery Patients'spouses Prospective study Male spouses Preoperative counseling

Effect of mineral additives and permeability reducing admixtures having different action mechanisms on mechanical and durability performance of cementitious systems

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Frontiers of Structural and Civil Engineering 2021年第5期15卷 1277-1291页

作者： Ali NEMATZADEH burcu AYTEKIN Ali MARDANL-AGHABAGLOU Department of Civil Engineering Bursa Uludag UniversityNilufer-Bursa 16059Turkey

In this paper,the effect of usage of the permeability reducing admixture(PRA)having different action mechanisms on hardened state properties of cementitious systems containing mineral additives is *** this aim,three commercial PRAs were used during *** effective parameters in the first and third PRAs were air-entraining and high-rate air-entraining,*** second one contained the insoluble calcium carbonate residue and had a small amount of the air-entraining *** mixes with binary and ternary cementitious systems were prepared by partially replacing cement with fly ash and *** hardened state properties of mortar mixtures such as compressive strength,ultrasonic pulse velocity,water absorption,drying shrinkage and freeze-thaw resistance were *** ternary cement-based mixture having both fly ash and metakaolin was selected as the most successful mineral-additive bearing mix in regard to hardened state *** this sense,PRA-B,with both insoluble residues and a small amount of air-entraining properties,showed the best performance among the mixtures containing *** combined use of mineral additive and PRA had a more positive effect on the properties of the mixes.

关键词： cementitious system mineral additive permeability reducing admixture mechanical properties durability performance

On Weighted Estimates of High-Order Riesz-Bessel Transformations Generated by the Generalized Shift Operator

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Acta Mathematica Sinica,English Series 2005年第1期21卷 53-64页

作者： Isman EKINCIOGLU ayhan SERBETCI Department Department of Mathematics Ankara University06100 Tandogan-AnkaraTurkey

In this paper, we establish sufficient conditions on weights which ensurethat high-order Riesz-Bessel transformations generated by the generalized shift operator actboundedly from one weighted L_p-space into another.

关键词： Generalized shift operator Riesz-Bessel transformations

Effect of thermal treatment on the swelling and surface roughness of common alder and wych elm wood

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Journal of Forestry Research 2016年第1期27卷 225-229页

作者： ayhan Aytin Suleyman Korkul Program of Furniture and Decoration Duzce Vocational School Duzce University Diizce Turkey Department of Forest Industry Engineering Faculty of Forestry Duzce University Diizce Turkey

Wood heat treatment has increased signifi- cantly in recent years and is still growing as an industrial process to improve some wood properties. We studied the change of swellingand surface roughness of common alder （Alnus glutinosa （L.） Gaertn. ***） and wych elm （Ulmus glabra Huds.） woods after heat treatment at two different temperatures and durations. The temperatures were 180 and 200 ℃ and the durations were 2 and 4 h. A stylus method was employed to evaluate the surface char- acteristics of the samples. Roughness measurements by the stylus method were made in the direction perpendicular to the fiber on the wood surface. Four main roughness parameters, mean arithmetic deviation of profile （Ra）, mean peak-to-valley height （Rz）, root mean square roughness （Rq）, and maximum roughness （Ry） were used to evaluate the effect of heat treatment on the surface characteristics of the specimens. Swelling and surface roughness parameters （Ra, Rz, Ry, and Rq） differed significantly for two temper- atures and two durations of heat treatment. Swelling and surface roughness values decreased with increasing treat- ment temperature and treatment times.

关键词： Heat treatment Swelling Surfaceroughness. Common alder Wych elm

Oxygen isotopic variations in modern cetacean teeth and bones： implications for ecological, paleoecological, and paleoclimatic studies

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Science Bulletin 2016年第1期61卷 92-104页

作者： burcu Ciner Yang Wang William Parker Department of Earth Ocean and Atmospheric Scienceand National High Magnetic Field LaboratoryFlorida State UniversityTallahasseeFLUSA Department of Geological Engineering Balikesir UniversityBalikesirTurkey department of earth ocean and atmospheric scienceflorida state universityTallahasseeFLUSA

The oxygen isotope ratios （δ18O） preserved in marine sediments have been widely used to reconstruct past ocean temperatures. However, there remain significant uncertainties associated with this method, owing to assumptions about the δ18O of ancient seawater which affects the temperature inferred from sediment δ18O records. In this study, oxygen isotope compositions of phosphate in teeth and bones from five different modem cetacean species, including sperm whale, pygmy sperm whale, short-finned pilot whale, killer whale, and Cuvier＇s beaked whale, and three fossil whales were determined. The data were used to assess whether the oxygen isotope ratios of biogenic phosphate （δ18Op） from cetaceans are a reliable proxy for the oxygen isotopic composition of ocean water （δ18Ow）. The δ18Op values of modem cetaceans range from 15.5 ‰ to 21.3 ‰, averaging （19.6 ‰ ±0.8 ‰）（n = 136）.Using a greatly expanded global cetacean δ18Op dataset, the following regression equation is derived for cetaceans： δ18Ow = 0.95317 （4-0.03293） δ18Op- 17.971 （＋0.605）, r = 0.97253. The new equation, when applied to fossil teeth and bones, yielded reasonable estimates of ancient seawater δ18Ow values. Intra-tooth isotopic variations were observed within individual teeth. Among the selected species, the killer whale （O. orca） has largest intra-tooth δ18Op preference and migratory the lowest δ18Op values and the variation, reflecting its habitat behavior. The results show that oxygen isotope analysis of phosphate in cetacean teeth and dense ear bones provides a useful tool for reconstructing the oxygen isotopic composition of seawater and for examining environmental preferences （including migratory behavior） of both modem and ancient whales.

关键词： Oxygen isotopes Phosphate Cetacean Whales Teeth Bones

Mechanical properties and impact resistance of concrete composites with hybrid steel fibers

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Frontiers of Structural and Civil Engineering 2022年第5期16卷 615-623页

作者： FatihÖZALP Halit Dilşad YILMAZ burcu AKCAY Department of Civil Engineering Faculty of Engineering and Natural SciencesIstanbul Medeniyet Universityİstanbul 34700Turkey ISTON Istanbul Concrete Elements Factoriesİstanbul 34325Turkey Faculty of Engineering Kocaeli UniversityKocaeli 41000Turkey

The aim of this study is to develop concrete composites that are resistant to armor-piercing projectiles for defense *** reinforcement configurations have been tested,such as short steel fibers,long steel fibers,and steel mesh *** different concrete mix designs were prepared as“Ultra High Performance(UHPFRC),High Performance(HPFRC)and Conventional(CFRC)Fiber Reinforced Concrete”.The content of hybrid steel fibers was approximately 5%in the UHPFRC and HPFRC mixtures,while the steel fiber content was approximately 2.5%in the CFRC *** addition,a plain state of each mixture was *** properties of concrete were determined in experimental *** addition to the fracture energy and impact strength,two important indicators of ballistic performance of concrete are examined,which are the penetration depth and damage *** results of the study show that the depth of penetration in UHPFRC was around 35%less than that in *** was determined that the mixtures of UHPFRC and HPFRC containing 5%by volume of hybrid steel fibers showed superior performance(smaller crater diameter and the less projectile penetration depth)against armor-piercing projectiles in ballistic tests and could be used in defense structures.

关键词： projectile impact depth of penetration fracture energy crater diameter UHPFRC