Sürdürülebilir Kalkınma Amaçları
Yazarlar
- Ashyralyyev, Charyyar(18)
- Ashyralyev, A.(15)
- Dogan, Ramazan Ozgur(15)
- Ashyralyev, A(10)
- Ekinci, Murat(9)
- Lukashov, A.(9)
- Kayikçioglu, Temel(8)
- Malkowsky, E(8)
- Özden, Talat(8)
- Akinoglu, Bulent G.(7)
- Memetoglu, M. E.(7)
- Albayrak, Cenk(6)
- Ashyralyev, Allaberen(6)
- Cakir, Zafer(6)
- Dogan, Hulya(6)
- Kayikcioglu, Temel(6)
- Bingol, Ozkan(5)
- Bingöl, Ozkan(5)
- Cakalli, H.(5)
- Canak, I.(5)
- Demir, S.(5)
- Gedikli, Eyup(5)
- Gurtug, O.(5)
- Harte, R.(5)
- Kalkan, A.(5)
- Kandemir, H.S.(5)
- Kocinac, L.D.R.(5)
- Ozden, Talat(5)
- Ozsahin, M(5)
- Sadybekov, M.(5)
- Sahin, H.(5)
- Simsek, Cemaleddin(5)
- Tez, M.(5)
- Turan, I.(5)
- Yildirim, Omer(5)
- Çakmak, Recep(5)
- Akay, K.U.(4)
- Akpulat, Murat(4)
- Aliyazicioglu, Y.(4)
- Altas, Ismail H.(4)
Yayınlar
- BildiriYalnız künye2023Performance Evaluation of Quantum-Resistant TLS for Consumer IoT Devices
Bozhko, Jessica; Hanna, Yacoub; Harrilal-Parchment, Ricardo; Tonyali, Samet; Akkaya, Kemal
Post-quantum (PQ) cryptographic algorithms are currently being developed to be able to resist attacks by quantum computers. The practical use of these algorithms for securing networks will depend on their computational and communication efficiency. In particular, this is critical for the security of wireless communications within the context of consumer IoT devices that may have limited computational power and depend on a constrained wireless bandwidth. To this end, there is a need to evaluate the performance of widely used application layer security standards such as transport layer security (TLS) to understand the use of the existing PQ algorithms that are being evaluated by NIST as a replacement to the current cryptographic algorithms. This paper focuses on two widely used IoT standards Bluetooth Low Energy (BLE) and WiFi to find out the optimal performing PQ algorithm for their security when used in end-to-end connections over the Internet. By implementing the capability for IP over BLE and all options of TLS connection establishment, we developed a client-server IoT testbed to measure the efficiency of PQ key encapsulation mechanisms (KEMs) and PQ digital signature algorithms. The test results showed that Kyber512 is the ideal KEM while Falcon-512 and Dilithium2 are the best signatures for BLE and WiFi devices. Based on this outcome, we developed a mechanism for IoT devices with multiple communication interfaces, that dynamically chooses a PQ KEM algorithm based on the MAC layer protocol being used at the time.
AtıfScopus26WoS15OpenAlex21İncele - BildiriYalnız künye2023Recoil Stabilization of Two-Wheeled Robot Through Control Moment Gyroscope (CMG)
Unker, Faruk
In this study, the weapon and gyroscopes mounted on the armored two-wheeled robot have been studied for controlling recoil dynamics. To date, the interaction between recoil energy and control moment gyroscope (CMG) has not been investigated for a two-wheeled robot. Therefore, this study will be interesting academic research in the dynamic response and control strategy of a CMG subjected to recoil impulsive loads resulting from firing the weapon. The first aim of this study is to maintain the stabilization of the robot within the CMG limits when subjected to impulsive loads without needing the allowable stroke as being for a hydraulic damper. Equations of motion and the correlation between the shot recoil and angular momentum are derived by the Lagrangian method and simulated by Matlab. Then RecurDyn model of the two-wheeled robot is used to control and analyze dynamic parameters under applied recoil energy. As a result, the comparison of RecurDyn simulation and Matlab data are extremely exact and the Lagrangian equations can be used to obtain optimal parameters of the two-wheeled robot concerning the correlation between gyroscopes and weapon.
AtıfScopus4OpenAlex2İncele - BildiriYalnız künye2023IMPORTANCE OF STATIC TESTS FOR THE PREDICTION OF AMD POTENTIAL OF CEMENTED PASTE BACKFILL
Cihangir, Ferdi; Koc, Ercument; Orak, Mursel; Deveci, Taha Yavuz; Ercikdi, Bayram; Trofymchuk, O.; Rivza, B.
Cemented paste backfill (CPB) is an engineering mixture of mine tailings, cement and water. Tailings can commonly contain sulphidic minerals. In this case, acid mine drainage (AMD) may occur due to the oxidation of sulphidic minerals present in the body of the CPB. In general, AMD lowers the pH of the medium and water environment and may cause heavy metal release. Therefore, AMD potential is an important parameter to be considered with regard to environmental aspect. Static tests are widely used to determine the AMD potential of sulphidic materials. When neutralization capacity is higher than the acid generation potential, tailings can be safely stored from an environmental point of view. In this study, AMD potential of CPB material produced from sulfur-containing fine tailings is investigated. In this scope, a static modified ABA test was performed on fine sulphidic tailings (TA) and CPB produced from the same sulphidic tailings+7%wt. SR5 cement+water for the first time. Findings suggests that the CPB material had a lower AMD potential (~10%) compared to the tailings. Acid generation capacity of both tailings and the CPB was found to be dominant due to the high sulphide content (~30%wt. and ~28%wt.), respectively. However, CPB was observed to maintain its structural integrity and did not release acidic water for at least 40 weeks. This study showed that a well-designed CPB can be effectively used as an environmentally friendly mine tailings management method.
AtıfOpenAlex1İncele - BildiriYayıncıda açık erişim2022Shading Effect of Transparent Photovoltaic Panels on Crops Underneath Agrivoltaic Systems
Esmaeilzad, Nasim Seyedpour; Dino, Ipek Gursel; Güney, Dilara; Yildirim, Yusuf Ersoy; Turan, Rasit; Özden, Talat; Amaducci, S
Agrivoltaic systems combine soil-grown crops with photovoltaic (PV) panels erected several meters above the ground. Combining solar panels and food crops on the same land can maximize land utilization. Under the PV panels, however, microclimate factors like solar radiation, air temperature, humidity, and soil temperature change. An agrivoltaic system must optimize sunlight sharing between solar panels and crops to maximize food energy production. It has been challenging to improve and analyze the performance of agrivoltaic systems due to the lack of a defined crop-specific parameter. In this work, we present a practical option to partially replace bifacial modules with semi-transparent ones, providing comparable levels of crop protection and greater climate change resilience while generating green energy and increasing land-use efficiency. The agrivoltaic system must be tailored to satisfy the needs of crops. For this purpose, a simulation model was conducted, which examined the impact of module transparency and cell layout based on light availability.
AtıfWoS5OpenAlex3İncele - BildiriAçık Erişim2022Self-care Agency in Pregnancy
Ozcan, Handan; Sahan, Ozlem; Gunay, Mehmet; Simsek, Hediye
Objective: This study was conducted to evaluate the self-care agency of women during pregnancy. Methods: A descriptive and cross-sectional design was used in the study. The population of the study consisted of women with pregnancy who presented to obstetrics outpatient clinics in Gumushane public hospital between January 30, 2018 and June 20, 2018, and the sample included women who accepted to voluntarily participate in the study (n=201). Data collection tools included a personal information form and the SelfCare Agency Scale. The data were analyzed on a statistical software package, and the level of significance was determined as p<0.05. Results: : The mean age of the pregnant women who participated in the study was 27.50 +/- 4.84 (min.-max.=18-41), 72.5% of them had high school and higher education, and 54.8% was housewives. Profession, adequate and balanced nutrition, participation in social activities, and getting social support were found to create statistically significant differences in self-care agency scale scores (p<0,05). It was determined that more than half of the women with pregnancy had a very good level of self-care agency. Conclusion: Many factors (increasing number of curettage, occupational groups, participation in social activities, adequate and balanced nutrition, and support from the family) affect the self-care agency of women during pregnancy. It is recommended that health professionals discuss and evaluate self-care issues in pregnancy in their in-service education programs.
AtıfWoS2OpenAlex3TR Dizin1İncele - BildiriYalnız künye2022Scopus SJRQ1ERECTILE DYSFUNCTION TREATMENT WITH PHOSPHODIESTERASE-5 INHIBITORS: GOOGLE TRENDS ANALYSIS OF LAST 10 YEARS AND COVID19 PANDEMIC
Deger, Muslim D.; Madendere, Serdar
- BildiriYalnız künye2022Segmentation of Pectoral Muscle Region in MLO Mammography Images by Backboned U-Net
Dogan, Ramazan Ozgur; Türe, Hayati; Kayikçioglu, Temel
The pectoral muscle region on MLO mammography images appears prominently similar to suspicious areas. For this reason, Computer-Aided Detection (CAD) systems remove this region to reduce false-positive rates in the mass detection process. In some cases, the pectoral muscle region is exposed to distortions due to the superposition effects caused by the mammography technique. As a result, segmentation error rates of the pectoral muscle region, whose characteristic features are deteriorated, appear. In this study, a method to identify impaired pectoral muscle regions with MobileNetV2 backboned U-Net Deep Learning method is proposed. The proposed method was tested on 84 and 201 mammography images taken from both MIAS and InBreast databases and segmented with 1.81% and 1.92% false-negative (FN) and 0.25% and 0.37% false positive (FP) rates, respectively. Particularly for distorted pectoral muscle regions, the proposed method has been shown to outperform some pioneering studies in this area.
AtıfOpenAlex1İncele - BildiriYalnız künye2022Scopus SJRQ4Assessment of Rapid Urbanization Effects with Remote Sensing Techniques
Yagmur, Nur; Dervisoglu, Adalet; Bilgilioglu, B. Baha; Ahmed, M.B.; Boudhir, A.A.; Kara, I.R.; Jain, V.; Mellouli, S.
Istanbul is the most populous city in Turkey. The population, which was approximately 5.5 million in 1985, has reached 15.5 million in 2020. Population growth is the most important factor behind human activities that put pressure on the environment. An increasing population means depletion of limited resources, increasing environmental problems, and rapid urbanization. In parallel with the increase in population and urbanization, there has also been an increase in demand for housing, leading to new residential areas in almost every district of Istanbul. This study examined the transformation from vegetation areas to residential areas between 1985 and 2020 in a selected region in Buyukcekmece, one of the 39 districts of Istanbul. The relationship between land use and land cover (LULC) change in the area and Land Surface Temperature (LST) change caused by urbanization was analyzed. It is seen that the built-up area has increased from 57.1 ha to 781.4 ha in 35 years. In every five years, an increase in surface temperatures was determined in parallel with increasing urbanization, and this increase was determined as about 5.4℃ from 1985 to 2020. Also, when the temperature data of the Buyukcekmece Meteorological station is analyzed, it is seen that there has been an increase of approximately 2 ºC in air temperatures in the last five years. In addition, movements were observed in the stability of structures in rapid urbanization areas after analyzing with the PSI time series InSAR method. The main causes were determined as construction sites around the buildings and geological conditions of the ground, which are triggered by urbanization.
AtıfScopus1OpenAlex2İncele - BildiriAçık Erişim2022Performance Evaluation of TLS 1.3 Handshake on Resource-Constrained Devices Using NIST's Third Round Post-Quantum Key Encapsulation Mechanisms and Digital Signatures
Saribas, Sultan; Tonyali, Samet
Towards the end of the 20. century, quantum computing came into sight by the main effect of Shor's Algorithm. While this algorithm offers a solution for the factorization problem, which makes it exponentially faster, it alongside becomes a critical threat for the encryption schemes since mostly their security mechanisms rely on the difficulty of integer factorization or discrete log problems. Despite it is not known when advanced quantum computers will show up, yet, once it is developed, most existing cryptography will be rendered useless, which means all existing information security will be vulnerable. Owing to this risky situation, The National Institute of Standards and Technology (NIST) launched post-quantum cryptography (PQC) standardization process for the development of PQC schemes. In this paper, we have chosen three key encapsulation mechanisms and two digital signature algorithms with different parameter sets from the round three submissions. We measured their TLS 1.3 handshake performance using two resource-constrained devices and compared it to that of classical encryption and digital signature schemes. Experiment results showed that post-quantum algorithms come with an extra message overhead while their handshake delay values are promising.
AtıfScopus12OpenAlex11İncele - BildiriAçık Erişim2022Is COVID-19 Friend or Foe to Industry 4.0: Experiences of Turkish White Goods Suppliers
Demirbag, Kubra Simsek; Yildirim, Nihan
This study, in the two years since the beginning of the COVID-19 pandemic, reveals the most focused issues by the Turkish white goods suppliers regarding Industry 4.0 and the challenges encountered while engaging in Industry 4.0 practices. The data were obtained through a questionnaire form participated by the managers of 36 different companies that are members of the Turkish White Goods Suppliers Association. The collected data were classified, and it was found that the most focused issues of the companies were technology investments, ERP and MES, data collection, business processes, investment plans, organizational transformation, occupational health and safety, and participation in Industry 4.0-related events, respectively. Moreover, the most common challenges companies face concerning Industry 4.0 are related to the not being able to come together, finance, technology providers, postponement of investment plans, and loss of employees. On the other hand, 16% of the participating companies stated that they did not encounter any difficulties.
AtıfScopus2OpenAlex2İncele - BildiriYalnız künye2022Numerical Solution of Time-Nonlocal Problem for Parabolic Equation
Ashyralyev, Allaberen; Ashyralyyev, Charyyar; Cakalli, H.; Kocinac, L.D.R.; Ashyralyev, A.; Harte, R.; Dik, M.; Canak, I.; Kandemir, H.S.; Tez, M.
In this work, we study time-nonlocal boundary value problem for multi-dimensional parabolic partial differential equation. Two difference schemes for approximate solution of non-local boundary value problem are discussed. Theorems on stability of solutions both difference schemes are given without proof. Numerical results for test examples are outlined.
AtıfScopus2OpenAlex3İncele - BildiriYalnız künye2022Magmatic, tectonic and metallogenic evolution of the Eastern Pontides, Turkey: a protracted or discrete construction of the crustal fertility?
Turlin, Francois; Moritz, Robert; Sönmez, Safak Utku; Keskin, Serdar; Karsli, Orhan; Aydin, Faruk; Ulyanov, Alexey; Dokuz, Abdurrahman; Christie, AB
Even though mechanisms of crustal growth and differentiation are well known, the spatial and temporal evolution of the composition of the continental crust remains poorly constrained, even more when considering the metal budget in mountain belts. In this study, we use the Eastern Pontides, NE Turkey, as a natural laboratory to decipher the role of successive tectono-magmatic events during the buildup of the continental crust fertility. This area is a Gondwana-derived terrane that accreted to the Eurasian margin. It underwent successive orogenic phases associated with the closure of the Paleo- and Neotethys oceans, and lastly the Alpine orogeny. It hosts abundant volcanogenic massive sulfide, porphyry and epithermal deposits, mostly formed in the latest stages of arc construction. These features relative to the buildup of metal fertility in this continental crust raise questions such as were the physico-chemical conditions during the early sterile history of the Eastern Pontides unfavorable to form ore deposits or were the metals progressively concentrated in the crust during successive orogenic events? We will use whole-rock geochemistry, U-Pb zircon dating, and Hf-O isotopic and trace element compositions of magmatic zircons to constrain the construction of the continental crust in the Eastern Pontides, and its metal fertility through time.
- BildiriYalnız künye2021Scopus SJRQ2Evaluation of Vibrational Spectroscopy Techniques (NIR, MIR, Raman) Combined with Chemometrics in Detecting Adulteration of Essential Oils.
Menevseoglu, Ahmed; Gumus, Cansu
- BildiriYalnız künye2021BroomyCell: An Introductory Educational Software for Neuroscience
Ozcan, Zubeyir; Yildirim, Omer; Kayikcioglu, Temel
Nerve cells are the basic building blocks of the nervous system. Therefore, the first step in neuroscience education is the introduction of nerve cells. However, both the complexity of nerve cells and the difficulty of their experimental examination make it difficult to test nerve cells practically. Therefore, simulation of nerve cells is found to be significantly effective. The difficulty of examining this type of cells experimentally shows its effect on neuroscience education. This brings to the fore the necessity of virtual laboratory environments designed for use in education. In this study, BroomyCell, which is designed by us as an introductory educational software in neuroscience education, was introduced. With this desktop application, it is aimed that potential neuroscientists learn their fields experimentally and without the need for a physical laboratory.
- BildiriAçık Erişim2021Pneumonia Detection from Pediatric Lung X-Ray Images with Convolutional Neural Network Method
Demir, Yasin; Bingöl, Ozkan
Pneumonia can be cause diseases such as cough, fever and respiratory problems and to death in the progressive situations. Mostly lung x-ray images are used for diagnosis of pneumonia. In this study, an unique convolutional neural network model that can help experts in detection of pneumonia using lung x-ray images below 5 years of age. In the model, open access to 5840 images has been used, and various data increasing methods were used to increase the performance of the training and the success of the method. With the proposed convolutional neural network model, an accuracy rate of 94.55% has been achieved.
AtıfWoS2OpenAlex3İncele - BildiriAçık Erişim2021Automatic Sleep Scoring System Based On Autoregressive Model
Melek, Mesut
Electroencephalography (EEG) signals recorded during sleep are divided into 30-second segments and analyzed by experts and classified into sleep stages, and in this way, diagnosis and treatment of diseases are made. Computer-assisted sleep scoring systems can effectively reduce the burden of experts by classifying sleep stages. In this study, after preprocessing of the EEG signals, four features were obtained for each EEG band (20 features in total) with the autoregressive model and then classified with three different classifiers common in machine learning. The proposed method was tested on the data set called ISRUC sleep (Subgroup 3, ISRUC3) and the results were compared with the results of other studies. The results show that the proposed method is more successful than other existing methods, despite the use of fewer features.
AtıfOpenAlex1İncele - BildiriAçık Erişim2021Investigation of In-Vitro Properties of NiTi Alloy After Micro Arc Oxidation
Süküroglu, Suleyman; Totik, Yapr; Süküroglu, Ebru Emine; Küçükosman, Ridvan
As material science is integrated into medical science as in other fields, the variety, development and usage areas of biomaterials increase. One of the biomaterials in this variety is NiTi alloys. This study was focused on the coating of TiO2 layer by using the method of Micro Ark Oxidation with the aim of the improvement of surface and mechanical properties of Shapedmemory and bio material NiTi alloy. Structural properties of the coatings were analysed by of SEM and XRD. In vitro ability was investigated by soaking the coated NiTi samples in simulated body fluid (SBF) at temperature 37 degrees C for various time periods. After soaking, Ni+2 release was applied to the media where coated and uncoated shape-memory NiTi samples are available, and its control was made by means of ICP-MS device. The results also show that Toxic and carcinogenic effects of Ni+2 release is significantly reduced by the TiO2 coating. Thus, it is observed that the properties that limit the use of NiTi alloys has been substantially fixed by MAO coating. It was found that the bioactive properties of the TiO2 coated NiTi substrate increased by MAO method and at the end of the 72 hour, there was no statistically any cytotoxicity in cell viability compared to the NiTi substrate.
AtıfWoS3OpenAlex2İncele - BildiriAçık Erişim2021Solution of Inverse Problem for an Elliptic Equation by Differential Transform Method
Dedeturk, Mutlu; Cakalli, H.; Kocinac, L.D.R.; Ashyralyev, A.; Harte, R.; Dik, M.; Canak, I.; Kandemir, H.S.; Tez, M.; Gurtug, O.
In this work, inverse problem for an elliptic equation is studied. We gave a numerical solution of inverse elliptic problem by differential transform method in test example.
- BildiriAçık Erişim2021QUALITY ASSESSMENT of PANSHARPENED RASAT and LANDSAT-8 IMAGES USING SYNTHETIC SENTINEL-2 PANCHROMATIC IMAGE
Gunen, M.A.; Karas, I.R.; Ben Ahmed, M.; Boudhir, A.A.; Ane, B.K.
Technical and physical limitations often do not allow images to be acquired with high spatial and spectral resolution. Pansharpened images obtained by fusing high spatial resolution panchromatic images and multi-spectral images are widely used in GIS applications. In this study, it is aimed to increase the spatial resolution of the RASAT and Landsat-8 multispectral satellite images with synthetic Sentinel-2 panchromatic data. Six different pansharpening methods were used to test the success of the synthetic panchromatic data generation method using dataset with two different land use/land cover properties. Seven full reference image quality assessment metrics and two referenceless image quality assessment metrics were used to perform quantitative comparison.
AtıfOpenAlex1İncele - BildiriYalnız künye2021Numerical solution of the nonlocal reverse parabolic problem with second kind boundary and integral conditions
Ashyralyyev, Charyyar; Gönenç, Ahmet; Ashyralyev, A.; Ashralyyev, C.; Erdogan, A.S.; Lukashov, A.; Sadybekov, M.
In this work, we consider approximation of nonlocal reverse parabolic problem with second kind boundary and integral conditions. Stability and coercive stability estimates for solution of difference scheme are obtained. Some illustrations of numerical results in examples of one and two dimensional reverse parabolic equations are presented.