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All-optical image denoising using a diffractive visual processor

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Light(Science & Applications) 2024年第3期13卷 429-445页

作者： Çağatay Işıl Tianyi Gan Fazil Onuralp Ardic koray Mentesoglu Jagrit Digani Huseyin Karaca Hanlong Chen Jingxi Li Deniz Mengu Mona Jarrahi Kaan Akşit Aydogan Ozcan Electrical and Computer Engineering Department University of CaliforniaLos AngelesCA 90095USA Bioengineering Department University of CaliforniaLos AngelesCA 90095USA California NanoSystems Institute(CNSI) University of CaliforniaLos AngelesCA 90095USA University College London Department of Computer ScienceLondonUnited Kingdom

Image denoising,one of the essential inverse problems,targets to remove noise/artifacts from input *** general,digital image denoising algorithms,executed on computers,present latency due to several iterations implemented in,e.g.,graphics processing units(GPUs).While deep learning-enabled methods can operate non-iteratively,they also introduce latency and impose a significant computational burden,leading to increased power ***,we introduce an analog diffractive image denoiser to all-optically and non-iteratively clean various forms of noise and artifacts from input images–implemented at the speed of light propagation within a thin diffractive visual processor that axially spans<250×λ,whereλis the wavelength of *** all-optical image denoiser comprises passive transmissive layers optimized using deep learning to physically scatter the optical modes that represent various noise features,causing them to miss the output image Field-of-View(FoV)while retaining the object features of *** results show that these diffractive denoisers can efficiently remove salt and pepper noise and image rendering-related spatial artifacts from input phase or intensity images while achieving an output power efficiency of~30–40%.We experimentally demonstrated the effectiveness of this analog denoiser architecture using a 3D-printed diffractive visual processor operating at the terahertz *** to their speed,power-efficiency,and minimal computational overhead,all-optical diffractive denoisers can be transformative for various image display and projection systems,including,e.g.,holographic displays.

关键词： remove rendering holographic

Retraction to: Shear strength of extremely altered serpentinites based on degree of saturation (Ankara, Turkey)

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Journal of Mountain Science 2024年第4期21卷 1446-1446页

作者： koray ULAMIŞ Department of Geological Engineering Ankara UniversityAnkara 06830Turkey

The Editor in Chief has retracted this *** publication,concerns were raised over potentially inconsistent data-for example,the author mentioned residual soil with silt fraction,but Fig.5 shows even the smallest grains are beyond silt *** analysis showed that Fig.6 and Fig.9 show both loose and dense soils exhibiting very similar dilatance behaviour,which is not *** author shared raw data,but it was incomplete and could not be *** Editor in Chief,therefore,has lost confidence in the findings of this *** author does not agree to this retraction.

关键词： Shear saturation smallest

Deep neck infections mortal complications:Intrathoracic complications and necrotising fasciitis

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World Journal of Clinical Cases 2024年第30期12卷 6383-6390页

作者： Kemal koray Bal Can Aslan Harun Gür Seda Turk Bal Recep Okan Ustun Murat Unal Department of Otorhinolaryngology Mersin UniversityMersin 33160Türkiye Department of Emergency Medicine Tarsus State HospitalMersin 33460Türkiye Department of Aestetic Division of Plastic and Reconstructive SurgeryUniversity of Health Sciences Mersin City HospitalMersin 33230Türkiye

BACKGROUND We planned this study considering that complications of deep neck infections can be seriously life *** To raise awareness that introthoracic complications and necrotizing fasciitis are causes of serious mortality and *** This study was carried out with the participation of 188 patients who were treated at Mersin University Department of Otorhinolaryngology and Head and Neck Surgery at January 1,*** the patient files were retrospectively examined,16 of 188 patients(8.5%)were included in the study because they were observed to have necrotizing fasciitis and/or intrathoracic *** There were a total of 16 patients in this study,9 males(56.25%)and 7 females(43.75%).All patients were adults(>18 years)and the mean age was 50.37 years±15.37 *** patients had a mean age of 40.42 years±13.38 years,whereas for male patients was 58.11 years±12.44 *** Patients with necrotizing fasciitis and/or intrathoracic complications require more complicated and serious surgeries,intensive care unit monitoring,and mechanical ventilator *** rates of morbidity and mortality should be expected in Bal KK et *** neck infections mortal complications WJCC https://*** 6384 October 26,2024 Volume 12 Issue 30 these patients who are hospitalized for longer periods of time.

关键词： Deep neck infection Necrotising fasciitis Mediastinitis Complications Mortality

Shear strength of extremely altered serpentinites based on degree of saturation(Ankara, Turkey)

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Journal of Mountain Science 2019年第4期16卷 944-954页

作者： koray ULAMI? Department of Geological Engineering Ankara University

The term "mélange" has several definitions due to the origin, tectonic and petrographical features. The geotechnical engineering behaviors of mélanges are either dominated by different kinds of intact rock blocks or matrix material. Landslides were encountered within the serpentinite matrix of Ankara Mélange, which is a typical bimrock mass. The residual sections of the extremely altered serpentinites are sandy soils. Such soils undergo rapid change of saturation, leading to shear strength reduction. Undisturbed and disturbed samples were obtained from the outcrops for shear box tests. Geochemical and petrographical composition of the serpentinites were determined by XRF(X Ray Fluorescence), XRD(X-ray diffraction) and thin section inspections, in order to outline the alteration process. Based on field observations, physically decomposed core stones exist beneath 40-120 cm thick residual green and grey-dark grey residual sandy soil. Physical and mechanical properties of the soils were tested with particular emphasis on residual shear strength parameters. Disturbed samples were remolded by standard compaction. The field work was completed during both rainy and summer seasons. Disturbed samples were prepared using phase diagrams in order to attain varying saturation degree. Two distinct sandy soil groups were determined through classification tests. The volumetric compression and/or expansion of the loose and dense samples were also considered based on the angle of dilatancy. A series of consolidated and drained shear box tests were conducted with ascending degree of saturation. The reduction of effective apparent cohesion, internal friction angle and dilatancy angle were determined to obtain a threshold of the degree of saturation. All the sand samples had zero residual internal friction angle and/or apparent cohesion after reaching 70% degree of saturation.

关键词： Mélange Serpentinite Shear strength Saturation Dilatancy Ankara

Toppling and sliding in volcanic bimrocks around Bayrakli(Izmir, Turkey)

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Journal of Mountain Science 2020年第2期17卷 492-500页

作者： Recep KILI? koray ULAMI? Ankara University Department of Geological Engineering

Discontinuities have significant role on the behavior of rock masses with respect to several types of instabilities. Excavability, deformability, bearing capacity and slope stability of the rock masses should be investigated considering the discontinuity characteristics with particular emphasis on the geomechanical properties. Kinematic analyses mostly provide an insight to the instabilities, however the dimensions of the blocks bounded by discontinuities, their geomechanical properties and the geometry of the slope should also to be taken into account. The study area is in the abandoned stone quarry in Bayrakl? district of ?zmir residential area. Due to the excavations and discontinuity orientations, instabilities have occured. Miocene aged andesites and altered agglomerates of Yamanlar Volcanics form the bimrock mass. The study area is located within a sheared zone, bounded by strike slip fault zone. Intact andesite blocks were encountered in altered agglomerate matrix, forming a volcanic bimrock. Wedge and planar sliding and block toppling were observed within the area. Detailed discontinuity surveying was conducted, combined with core drillings. Several typical locations were detected where prismatic blocks of andesites are bound to experience block toppling. Such locations are nearby the top of the steep slopes. Agglomerates are subjected to mainly sliding and the blocks have been formed not by gravity but by peculiarities of thevolcanic sedimentation and, probably by subsequent tectonics. In order to determine the mechanism of the sliding and toppling in more details, the relation of the blocks and the slope geometry were investigated. Bimrock type volcanic rock masses sometimes do not tend to accommodate the general rules of toppling and sliding due to their anisotropic settings.

关键词： Volcanic bimrock Toppling Sliding Discontinuity Bayrakli

Optimization of hydrolysis conditions for the production of protein hydrolysates from fish wastes using response surface methodology

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Food Bioscience 2022年第1期45卷 332-339页

作者： koray Korkmaz Bahar Tokur Fatsa Faculty of Marine Science Ordu UniversityOrduTurkey

The recycling of waste from food processing is an important industrial procedure for obtaining protein sources with high added *** this study,trout(Onchorynchus mykiss),anchovy(Engraulis encrasicolus),and whiting(Merlangius merlangus)wastes were *** hydrolyzation procedure was investigated under the optimum predicted conditions defined by time,temperature,and enzyme ratio(E/S)using alkaline protease(pH 8),Protamex(pH 7),and Flavourzyme(pH 7).The hydrolysis conditions that showed the best degree of hydrolysis(DH%)were optimized using response surface methodology(RSM)with the central composite design(CCD)and Box-Behnken design(BBD)*** effects of three independent variables,temperature(40-60℃),time(1-8 h),and enzyme concentrations(1-2%),were examined for model *** was determined that the DH%varies between 50.92%and 74.30% according to the type of fish waste and *** highest degree of hydrolysis was observed from trout waste(74.30%)and the lowest degree from whiting waste(50.92%)with *** this study,it has been shown that different degrees of hydrolysis and protein recovery can be obtained,depending on fish species,waste composition,enzyme type,and hydrolysis method.

关键词： Fish protein hydrolysate Optimization Degree of hydrolysis Protein recovery

Insights into the virologic and immunologic features of SARS-COV-2

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World Journal of Clinical Cases 2021年第19期9卷 5007-5018页

作者： Ceylan Polat koray Ergunay Department of Medical Microbiology Hacettepe University Faculty of MedicineAnkara 06100Turkey

The host immunity is crucial in determining the clinical course and prognosis of coronavirus disease 2019,where some systemic and severe manifestations are associated with excessive or suboptimal *** antigenic epitopes in spike,nucleocapsid and membrane proteins of severe acute respiratory syndrome coronavirus 2 are targeted by the immune system,and a robust response with innate and adaptive components develops in infected *** titer neutralizing antibodies and a balanced T cell response appears to constitute the optimal immune response to severe acute respiratory syndrome coronavirus 2,where innate and mucosal defenses also contribute *** exposure,immunological memory seems to develop and be maintained for substantial ***,we provide an overview of the main aspects in antiviral immunity involving innate and adaptive responses with insights into virus structure,individual variations pertaining to disease severity as well as long-term protective immunity expected to be attained by vaccination.

关键词： SARS-CoV-2 Immune response Neutralizing antibodies Spike protein

Composite impact vector control based on Apollo descent guidance

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Chinese Journal of Aeronautics 2022年第7期35卷 67-74页

作者： koray S.ERER Raziye TEKIN MKemal OZGOREN Tactical Missile Systems Roketsan Missiles Inc.Elmadağ06780Turkey Department of Mechanical Engineering Middle East Technical UniversityÇankaya 06800Turkey

A new three-dimensional missile guidance law to control the impact vector against a stationary target is *** composite guidance law has two well-known components:Apollo descent guidance and trajectory shaping *** respectively linear and planar guidance laws are combined to achieve a specified impact *** main idea is to define an impact plane and to steer the missile onto this plane using Apollo descent guidance while concurrently performing trajectory shaping with reference to the impact *** resulting guidance law is expressed by a single equation in vector form,which is straightforward to *** it originates from an optimal formulation,the performance of the proposed technique is expected to be *** is confirmed by comparative simulation runs,which also involve the method known as generalized explicit guidance.

关键词： Impact angle Impact plane Impact vector Three-dimensional missile guidance Trajectory shaping

Pancreatic hyperechogenicity on endoscopic ultrasound examination

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World Journal of Gastroenterology 2011年第15期17卷 2061-2062页

作者： Yucel Ustundag Guray Ceylan koray Hekimoglu Zonguldak Karaelmas University School of Medicine Department of Internal Medicine Gastroenterology Clinics Zonguldak 67100 Turkey Baskent University School of Medicine Department of Radiology Ankara 06100 Turkey

There is an ongoing discussion on how to diagnose a hyperechogenic pancreas and what is the clinical significance of diffusely hyperechogenic pancreas. Computerized tomography and magnetic resonance imaging are the more appropriate methods to diagnose pancreatic hyperechogenicity when compared with transcutaneous or endoscopic ultrasound examination. More importantly, pancreatic hyperechogenicity may not be a certain indicator of pancreatic fat infiltration. Even if it is true, we do not know the clinical significances of pancreatic fat accumulation. Some suggested that excess fat in the pancreas is associated with chronic pancreatitis. However, several histological studies on human alcoholic chronic pancreatitis did not prove the presence of fatty pancreas in such cases. Thus, except for aging, it is very rare to have truly steatotic pancreas in the absence of certain human diseases.

关键词： Hyperechogenic pancreas Fatty pancreas Endoscopic ultrasound Aging Chronic pancreatitis