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Fourier analysis of corneal Scheimpflug imaging:clinical use in keratoconus

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International Journal of Ophthalmology(English edition) 2021年第12期14卷 1963-1969页

作者： Dorukcan Akincioglu Gokhan Ozge Onder Ayyildiz Gokcen Gokce Umut Karaca fatih mehmet mutlu Ataturk State Hospital Antalya 07040Turkey Department of Ophthalmology Gulhane School of MedicineUniversity of Health SciencesAnkara 06010Turkey Department of Ophthalmology Gülhane Training and Research HospitalAnkara 06010Turkey Memorial Hospital Kayseri 38010Turkey Department of Ophthalmology Suleyman Demirel UniversityIsparta 32040Turkey

AIM:To evaluate the clinical use of Fourier analysis of videokeratography data in the diagnosis and follow-up of keratoconus(KC).METHODS:We conducted a chart review of consecutive patients presented to our cornea clinic.A team of two experienced cornea specialists divided the patients into three groups:normal cornea,forme fruste KC(FFKC),and clinical *** exclusion criteria were a history of previous ocular surgery,any accompanying corneal pathology other than KC,high myopia(>6.00 diopters),amblyopia,pregnancy,breastfeeding,or any current autoimmune *** data of Fourier series harmonic analysis were evaluated for their diagnostic capacity using the receiver operating characteristic(ROC)curve.A binary logistic regression analysis was also conducted to construct a diagnostic model.A total of 259 eyes showed progression in the clinical KC group and underwent a combination of accelerated corneal collagen cross-linking and topographyguided customized treatment with an excimer ***:The study included 1262 eyes(618 normal,530 KC,and 114 FFKC)of 1262 *** observed that maximum decentration(MaxDec)was almost as good as maximum keratometry(Kmax)in detecting progressive *** area under the curve(AUC)was 0.95 for KC[95%confidence interval(CI):0.93-0.96]and 0.84 for FFKC(95%CI:0.79-0.88).Higher predictive accuracy was obtained using a model combining the spherical component,MaxDec,irregularity,and regular astigmatism in the center of the cornea(AUC:0.97;sensitivity:89%,and specificity:96%).CONCLUSION:Decentration,Kmax,and posterior radii of curvatures from a 3.0-mm optical zone centered on the thinnest point of the cornea provide the highest accuracy with low reproducibility of Kmax.

关键词： Fourier keratoconus Scheimpflug imaging tomography topography

Comment on survival analysis following early surgical success in intermittent exotropia surgery

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International Journal of Ophthalmology(English edition) 2016年第10期9卷 1532-1534页

作者： Onder Ayyildz Gokhan Ozge Cem Ozgonul Gokcen Gokce fatih mehmet mutlu Department of Ophthalmology Gulhane Military Medical School Ankara 06010 Turkey Department of Ophthalmology Van Military Hospital Van65100 Turkey Department of Ophthalmology Kayseri Military HospitalKayseri 38100 Turkey

Dear Editor,We read the article by Lee et al with great *** would like to congratulate the authors for venturing into this area that assess the consecutive recurrence following early success of intermittent exotropia[X（T）]surgery and to determine the clinical factors that affect the ***,we would like to make the following *** the present study,it was discussed about the correlation of early postoperative overcorrection with long-term outcomes.

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A robust optimization method for label noisy datasets based on adaptive threshold: Adaptive-k

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Frontiers of Computer Science 2024年第4期18卷 49-60页

作者： Enes DEDEOGLU Himmet Toprak KESGIN mehmet fatih AMASYALI Department of Computer Engineering Yildiz Technical UniversityIstanbul 34220Turkey

The use of all samples in the optimization process does not produce robust results in datasets with label *** the gradients calculated according to the losses of the noisy samples cause the optimization process to go in the wrong *** this paper,we recommend using samples with loss less than a threshold determined during the optimization,instead of using all samples in the *** proposed method,Adaptive-k,aims to exclude label noise samples from the optimization process and make the process *** noisy datasets,we found that using a threshold-based approach,such as Adaptive-k,produces better results than using all samples or a fixed number of low-loss samples in the *** the basis of our theoretical analysis and experimental results,we show that the Adaptive-k method is closest to the performance of the Oracle,in which noisy samples are entirely removed from the ***-k is a simple but effective *** does not require prior knowledge of the noise ratio of the dataset,does not require additional model training,and does not increase training time *** the experiments,we also show that Adaptive-k is compatible with different optimizers such as SGD,SGDM,and *** code for Adaptive-k is available at GitHub.

关键词： robust optimization label noise noisy label deep learning noisy datasets noise ratio estimation robust training

土耳其人Duane眼球后退综合征的临床特点及手术疗效分析（英文）

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国际眼科杂志 2019年第5期19卷 714-718页

作者： Osman Melih Ceylan Adem Turk Gken Gkce ?nder Ayyildiz fatih mehmet mutlu Halil Ibrahim Altinsoy Diskapi Yildirim Beyazit 培训及研究医院眼科土耳其安卡拉06110 Karadeniz 工业大学医学院眼科土耳其特拉布宗61080 开塞利纪念医院眼科土耳其开塞利38010 Gülhane 培训及研究医院眼科土耳其06010 土耳其伊斯坦布尔世界眼科医院 34337

目的:分析Duane眼球后退综合征(DRS)患者的临床特点及手术疗效。方法:评估94例DRS患者临床数据。记录完整的眼科数据,包括年龄、性别、侧位、DRS类型、偏角、异常头部姿势(AHP)、眼球后退、过冲及手术入路类型。结果:患者年龄为15.4±9... 详细信息

目的:分析Duane眼球后退综合征(DRS)患者的临床特点及手术疗效。方法:评估94例DRS患者临床数据。记录完整的眼科数据,包括年龄、性别、侧位、DRS类型、偏角、异常头部姿势(AHP)、眼球后退、过冲及手术入路类型。结果:患者年龄为15.4±9.18岁,其中78例男性,16例女性。单侧和双侧受累分别为87%和13%。在单侧DRS患者中,左眼占65%。94例患者中,59.5%的患者为I型,29.7%的患者为II型,8.5%的患者为III型,2.1%的患者为IV型。大多数患者(36,38%)为嗜热性,43例(96%)患者术前AHP出现10°以上。有40例(43%)患者出现过度调校,通常为II型。对45例(48%)患者进行手术治疗。共32例(78%)行水平直肌手术后获得了较好疗效,24例(53%)患者AHP改善。结论:侧直肌的Y分裂和后榫固定在有明显过校的情况下都有令人满意的结果。垂直直肌转位增强术在限制外展方面取得了最佳效果。

关键词： Duane眼球后退综合征斜视手术结果

Wear and mechanical properties of carburized AISI 8620 steel produced by powder metallurgy

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International Journal of Minerals,Metallurgy and Materials 2021年第3期28卷 430-439页

作者： mehmet Akif Erden fatih Aydın Department of Biomedical Engineering Karabuk UniversityKarabuk 78050Turkey Department of Metallurgical and Materials Engineering Karabuk UniversityKarabuk 78050Turkey

The effect of carburization on the tensile strength and wear resistance of AISI 8620 steel produced via powder metallurgy was *** 1 and 2(with 0.2wt%C and 0.25wt%C,respectively)were first pressed at 700 MPa and then sintered at 1300,1400,or 1500℃for 1 *** ideal sintering temperature of 1400℃was ***,Alloys 1 and 2 sintered at 1400℃were carburized at 925℃for 4 *** microstructure characterization of alloys was performed via optical microscopy and scanning electron *** mechanical and wear behavior of carburized and noncarburized alloys were investigated via hardness,tensile,and wear *** carburization,the ultimate tensile strength of Alloys 1 and 2 increased to 134.4%and 138.1%,***,the elongation rate of Alloys 1 and 2 decreased to 62.6%and 64.7%,*** wear depth values of Alloy 2 under noncarburized and carburized conditions and a load of 30 N were 231.2 and 100.1μm,*** wear changed to abrasive wear when the load transitioned from 15 to 30 N.

关键词： powder metallurgy steels carburization microstructure wear mechanical properties

A New Reward System Based on Human Demonstrations for Hard Exploration Games

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Computers, Materials & Continua 2022年第2期70卷 2401-2414页

作者： Wadhah Zeyad Tareq mehmet fatih Amasyali Faculty of Electrical and Electronics Engineering Yildiz Technical UniversityIstanbul34220Turkey

The main idea of reinforcement learning is evaluating the chosen action depending on the current *** to this concept,many algorithms achieved proper performance on classic Atari 2600 *** main challenge is when the reward is sparse or *** environments are complex exploration environments likeMontezuma’s Revenge,Pitfall,and Private Eye *** built to deal with such challenges were very *** work introduced a different reward system that enables the simple classical algorithm to learn fast and achieve high performance in hard exploration ***,we added some simple enhancements to several hyperparameters,such as the number of actions and the sampling ratio that helped improve *** include the extra reward within the human *** that,we used Prioritized Double Deep Q-Networks(Prioritized DDQN)to learning from these *** approach enabled the Prioritized DDQNwith a short learning time to finish the first level of Montezuma’s Revenge game and to perform well in both Pitfall and Private *** used the same games to compare our results with several baselines,such as the Rainbow and Deep Q-learning from demonstrations(DQfD)*** results showed that the new rewards system enabled Prioritized DDQN to out-perform the baselines in the hard exploration games with short learning time.

关键词： Deep reinforcement learning human demonstrations prioritized double deep q-networks atari

Combined effects of local curvature and elasticity of an isothermal wall for jet impingement cooling under magnetic field effects

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Journal of Central South University 2021年第11期28卷 3534-3544页

作者： SELİMEFENDİGİL fatih ÇOĞAN mehmet ÖZTOP Hakan F. Department of Mechanical Engineering Celal Bayar UniversityManisa 45140Turkey Department of Mechanical Engineering Technology FacultyFırat UniversityElazığ23119Turkey

The aim of this study is to examine the effects of local curvature and elastic wall effects of an isothermal hot wall for the purpose of jet impingement cooling *** element method was used with *** important parametric effects such as Re number(between 100 and 700),Ha number(between 0 and 20),elasticity(between 104 and 109),curvature of the surface(elliptic,radius ratio between 1 and 0.25) and nanoparticle volume fraction(between 0 and 0.05) on the cooling performance were investigated *** results showed that the average Nu number enhances for higher Hartmann number,higher values of elastic modulus of partly flexible wall and higher nanoparticle volume *** the magnetic field is imposed at the highest strength,there is an increase of3.85% in the average Nu for the curved elastic wall whereas it is 89.22% for the hot part above it,which is due to the vortex suppression *** inclusion in the base fluid improves the heat transfer rate by about 27.6% in the absence of magnetic field whereas it is 20.5% under the effects of magnetic field at Ha=*** effects become important for higher Re numbers and at Re=700,there is 14.11% variation in the average Nu between the cases with the lowest and highest radius *** elastic wall effects on the heat transfer are reduced with the increased curvature of the bottom wall.

关键词： jet impingement nanoparticles elastic wall MHD CFD curved wall

Tuberculous and non-tuberculous cervical lymphadenopathy incidence and distribution in Somalia from 2016 to 2020:A review of 241 cases

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World Journal of Otorhinolaryngology-Head and Neck Surgery 2022年第4期8卷 361-369页

作者： mehmet Tahtabasi fatih Sahiner Department of Radiology University of Health Sciences-Somalia Turkey Recep Tayyip Erdogan Education and Research HospitalMogadishuSomalia Department of Medical Microbiology University of Health Sciences-Somalia Turkey Recep Tayyip Erdogan Education and Research HospitalMogadishuSomalia

Objective:To determine the incidence of tuberculous lymphadenitis(TBL)and other pathologies in cervical lymphadenopathies in Somalia and accompanying radiological ***:In this hospital-based retrospective study,the demographic character-istics,pathology results and radiological findings of 263 patients who underwent ultrasound(US)-guided cervical lymph node biopsy between January 2016 and February 2020 were ***:Of 241 patients 118 men and 123 women(mean age 27.9±18.1 years)included in the study,46.1%(n=111)were diagnosed as necrotizing granulomatous lymphadenitis(caseified,consistent with TBL)and 21.6%(n=12,atypical lymphoid cells and n=40,metastases)as *** most common type of metastasis was squamous cell cancer(n=31),and the primary source of most of them was esophageal cancer(16/31,51.6%).The age of patients with TBL was significantly lower than that of non-TBL(21.9±14.6 vs.41.9±24.6,P=0.003)and the incidence of TBL in pediatric patients was statistically higher(58.0%vs.21.5%,P=0.019).The rate of patients with TBL being localized at level 4 and level 5 was significantly more than non-TBL patients(18.0%vs.10.0%and 23.4%vs.10.8%,respectively,P=0.01).Half of patients with TBL who have chest radiography had pathological findings;consolidation and bronchopneumonia were present in 52.6%of *** were 2 patients with paravertebral abscess and one patient with gastrointestinal ***:In Somalia,in the presence of cervical lymphadenopathy,after diagnosis by using US-guided biopsy;primarily considering of TBL and malignancy,thoracic involvement should be investigated,and esophageal carcinoma must be excluded in terms of metastatic lymph node.

关键词： Cervical lymphadenopathy Tuberculosis Tumor metastasis Ultrasound-guided biopsy

Urinary tract infections in neonates with jaundice in their first two weeks of life

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World Journal of Pediatrics 2014年第2期10卷 164-167页

作者： mehmet mutlu Yasemin Cayır Yakup Aslan Department of Neonatology Erzurum Regional Training and Research HospitalNeonatal Intensive Care UnitErzurumTurkey Department of Family Physician Erzurum Regional Training and Research HospitalNeonatal Intensive Care UnitErzurumTurkey Department of Neonatology Karadeniz Technical UniversityNeonatal Intensive Care UnitTrabzonTurkey

Background:Hyperbilirubinemia is a frequently seen condition in *** study was undertaken to determine the role of urinary tract infections(UTIs)in the etiology of indirect hyperbilirubinemia in neonates with jaundice in their fi rst two weeks of ***:The study was conducted *** subjects were neonates aged 4-14 days with hyperbilirubinemia which could not be detected by routine tests and was suffi ciently severe to necessitate ***:The study was performed in 104 neonates,of whom 18%(n=19)had *** most frequently identified micro-organism was Escherichia coli(43%).Phototherapy duration and rebound bilirubin level were higher in neonates with UTI(P<0.05).Conclusion:UTI should be investigated in neonates with hyperbilirubinemia of unknown etiology in the fi rst two weeks of life.

关键词： hyperbilirubinemia neonate urinary tract infection