06. Meslek Yüksekokulları

Permanent URI for this communityhttps://hdl.handle.net/20.500.13091/1628

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Citation - WoS: 3
Citation - Scopus: 4
Cnn Based Sensor Fusion Method for Real-Time Autonomous Robotics Systems
(Tubitak Scientific & Technical Research Council Turkey, 2022) Yıldız, Berat; Durdu, Akif; Kayabaşı, Ahmet; Duramaz, Mehmet
Autonomous robotic systems (ARS) serve in many areas of daily life. The sensors have critical importance for these systems. The sensor data obtained from the environment should be as accurate and reliable as possible and correctly interpreted by the autonomous robot. Since sensors have advantages and disadvantages over each other they should be used together to reduce errors. In this study, Convolutional Neural Network (CNN) based sensor fusion was applied to ARS to contribute the autonomous driving. In a real-time application, a camera and LIDAR sensor were tested with these networks. The novelty of this work is that the uniquely collected data set was trained in a new CNN network and sensor fusion was performed between CNN layers. The results showed that CNN based sensor fusion process was more effective than the individual usage of the sensors on the ARS.
Citation - WoS: 28
Citation - Scopus: 33
Comparison of Commercial and Traditional Kefir Microbiota Using Metagenomic Analysis
(WILEY, 2021) Biçer, Yusuf; Telli, Arife Ezgi; Sönmez, Gonca; Turkal, Gamze; Telli, Nihat; Uçar, Gürkan
The current study aimed to determine the bacterial microbiota of five commercial and one traditional kefir beverages consumed in Turkey. In all samples, Firmicutes (93.66%-99.98%) were the most abundant filum. Actinobacteria were detected (6.19%) in one commercial sample, and Proteobacteria were detected (5.91%) in the traditional kefir beverage. The dominant family in all commercial kefir beverages was Streptococcaceae (89.12-99.83%), and the most common genus was Lactococcus in three samples and Streptococcus in the other two samples. However, Lactobacillaceae (36.68%) and Streptococcaceae (36.68%) were dominant in traditional kefir. Lactococcus, Streptococcus and Enterococcus were common in all samples.
Citation - WoS: 13
Citation - Scopus: 15
Determination of Some Physical and Chemical Properties of Common Hawthorn (crataegus Monogyna Jacq. Var. Monogyna)
(SPRINGER, 2021) Dokumacı, Keziban Yalçın; Uslu, Nurhan; Hacıseferoğulları, Haydar; Örnek, M. Nevzat
Hawthorn as a wild plant is an important fruit for human health. In this study, it was aimed to determine some physical and chemical properties of common hawthorn which is native plant of middle Anatolia in Turkey. According to chemical analysis results, crude protein, crude oil, ash, pH, acidity, total phenol contents and antioxidant activity values were found to be 3.03%, 1.22%, 2.77%, 4.08, 1.56%, 9.35 mg g(-1) and 67.62% respectively. Some mineral matter contents as K, P, Ca, Mg, Fe, Na and B values were found to be 16,273.88 mg kg(-1), 1316.92 mg kg(-1), 1263.86 mg kg(-1), 934.87 mg kg(-1), 62.20 mg kg(-1), 57.06 mg kg(-1) and 42.28 mg kg(-1) respectively. The values of mass, diameter, length, geometric mean diameter and sphericity of Common hawthorn fruit were determined as 0.93 g, 11.37 mm, 12.25 mm, 11.65 mm and 0.95 at 68.98% (db) humidity respectively. In addition, fruit hardness, chroma (C*), hue angle (h*) of hawthorn was found as 1.21 N, 28.94 ve 16.19 under same humidity respectively. According to study results, it can be concluded that the hawthorn fruits are admirable natural food for human nutrition, and it can be considered as reference for the future researches.
Citation - WoS: 1
Citation - Scopus: 1
An Easy-To Self-Healing Smart Design for Increasing Impact Strength and Crashworthiness Resistance of Honeycomb Sandwich Structures
(Sage Publications Ltd, 2022) Güçlü, Harun; Osmanoglu, Serhat; Hayırkuş, Aslıhan; Taş, Oğuzhan; Yazıcı, Murat
In this paper, the dynamic compression impact response of an aluminum honeycomb core filled with open-cell foams impregnated with self-healing liquid agents was investigated experimentally. Samples were subjected to a variety of impacts in order to determine healing time and self-healing performance. Three different sandwich specimens were developed to evaluate the effectiveness of self-healing. The sandwich specimens are designated as B (empty honeycomb core cells), S (only open-cell soft polyurethane foam-filled honeycomb core cells), and self-healing agent (SHA) (open-cell soft polyurethane foams impregnated with liquid self-healing agents). The test results were presented by considering the crashworthiness and healing efficiency criteria, and the impact characteristics of the samples were compared related to these criteria. After testing, the results demonstrated that the self-healing agent specimens had much fewer buckling deformation and displacement than their counterparts. Significant improvements were achieved in healing efficiencies and crashworthiness evaluation criteria. The peak load and the energy needed to attain peak load are considered healing efficiency criteria. Self-healing agent specimens reached 29.7% and 12.9% more peak loads, and in the energy absorbed up to peak loads 140% and 34.9% higher values than the B and S sandwiches. In the same samples, crushing strain features were acquired as 50% versus 66%, indicating less displacement in self-healing agent specimens than counterparts. The results indicated that an aluminum honeycomb sandwich structure that can heal itself after damage and recover impact characteristics remarkably could be produced practically.
Citation - WoS: 1
Citation - Scopus: 1
Flame Retardant and Antimicrobial Paper Coatings With Rosemary Oil and Barium Borate
(Publishing House of the Romanian Academy, 2022) Çölük, Gökhan; Ural, Elif; Kandırmaz, Emine Arman
Adding an antimicrobial effect to the papers used in the cardboard packaging industry can extend the life of the packed product. Paper, due to its structure, has the property of being ignited quickly. Enhancing the properties of paper, the combination of antimicrobial protection, low flammability and good printability to the paper will expand its usage area in the packaging industry. In this study, barium borate was synthesized in order to impart low flammability to paper. Different combinations of rosemary oil and barium borate were mixed with binding starch in varying amounts, and formulations were prepared. With these mixtures, 80 g/m2 paper was coated using a laboratory-type paper coating machine. The antimicrobial properties of the paper were investigated by performing the disk diffusion antimicrobial test against E. coli and S. aureus bacteria. The Limiting Oxygen Index (LOI) test was performed to determine the low flammability of the paper. Color, gloss, contact angle and surface energy tests were performed for the printability properties of the paper. As a result, the coatings containing formulations of barium borate and rosemary oil, applied to the paper surface, succeeded in imparting antimicrobial and low flammability properties to the papers, while also improving the printability features. © 2022, Publishing House of the Romanian Academy. All rights reserved.
Citation - WoS: 13
Citation - Scopus: 16
The Fuzzy Logic-Based Modeling of a Micro-Scale Sloped Solar Chimney Power Plant
(KOREAN SOC MECHANICAL ENGINEERS, 2021) Güzel, Muhammed Hüseyin; Ünal Ercan, Hatice; Önder, Ahmet; Şen, Muhammed Arif; Köse, Faruk
The energy demand of world is increasing worldwide because of increasing population and developing technology. The use of environmentally friendly renewable resources is very important in providing the increasing energy needs. In the renewable energy sources, the solar energy has a strategic importance because of its huge potential and unlimited. The production of electrical energy by solar chimney power plants is one of the reliable and profitable methods. Fuzzy logic-based approaches are commonly used for modeling different systems in many fields. Also, a renewable energy system can be modelled by fuzzy definitions. In this way, it can provide efficiently and quickly theoretical estimates of systems with productive simulations. In this study, using the experimental data obtained from the micro-scale sloped solar chimney power plant in carried on scientific research project by authors, the obtaining and verifying a fuzzy logic-based model (FLBM) that can calculate the change in air velocity at turbine according to the change of radiation and temperature is presented. The air velocity at the turbine inlet is the considerable variable determining the electricity generation in a solar chimney. Thus, the output of the model is determined as this air velocity. In changes in the radiation and temperature values are defined as inputs. A two input-one output fuzzy model is obtained, in which the inference method is designed in the form of Mamdani and the membership functions in the form of the triangle, making inferences according to the rule base determined by the experience achieved from the experimentally studies. In order to investigate the accuracy of the FLBM, the simulation results and the data get from experimental setup in April 2019 are compared and evaluated. The validation of the FLBM compared to the experimental system is investigated using different error evaluation criteria. It is proved that the results of FLBM and experimental data are realized at a high rate (95.95 %) close to each other and similarly.
Citation - WoS: 1
Citation - Scopus: 1
Investigation of Changes in Culturable Lactic Microflora During Freeze Storage in Cow and Goat Milk Kefirs by High-Throughput Sequencing
(Wiley, 2022) Biçer, Yusuf; Telli, A. Ezgi; Sönmez, Gonca; Türkal, Gamze; Telli, Nihat; Uçar, Gürkan
This study determined changes in the live lactic microflora of cow and goat milk kefirs, traditionally produced using kefir grain and freeze stored for 30 days, using high-throughput sequencing. In kefir grains, 71.29% Lactococcus, 16.27% Enterococcus, and 12.3% Serratia were found in the M17 agar, and 69.93% Lacticaseibacillus and 24.54% Lactobacillus were found in MRS agar. In the M17 agar of cow milk kefir, 78.26% Lactococcus was found on day 0, and this rate was 91.68%, 87.98%, and 88.14%, on the 7th, 14th, and 30th days, respectively. As for goat milk kefir, Lactococcus levels were 82.98%, 93.28%, 87.77%, and 84.92%, respectively. On the MRS agar in cow milk kefirs, Lacticaseibacillus levels were found as 56.98%, 61.21%, 87.54%, and 75.50%, on days 0, 7, 14, and 30 of storage, respectively, while the rates were 48.95%, 77.02%, 87.85%, and 83.38% for goat milk kefirs, respectively. As a result, although kefir beverages frozen at -25 degrees C contain sufficient levels of Lactobacillus and Lactococcus, it has been determined that the genus Serratia, which is one of the main spoilage factors in dairy products, is also increasing. Novelty impact statement In this study, the changes in the living lactic microflora during the frozen storage of traditional kefir beverages, whose production is increasing, were determined by high-throughput sequencing. It is thought that it is important to determine the effect of the freezing process on the viability of lactic acid bacteria, which are thought to have probiotic properties, for the long-term storage of these beverages. However, while lactic acid bacteria maintain their viability, it should be taken into account that microorganisms that are resistant to freeze conditions and cause spoilage can also develop.
Citation - WoS: 3
Citation - Scopus: 3
Lc-esi-ms/Ms-based Phytochemicals and Cytotoxic, Antioxidant, and Enzyme Inhibitory Activities of Scorzonera Mollis Subsp. Szowitzii: a New Reserve of Bioactive Compounds
(Wiley, 2022) Deveci, Ebru
Scorzonera L. species are important species used in folk medicine against as hypertension, arteriosclerosis, diabetes, kidney diseases, and rheumatism. In this study, phytochemical compounds, cytotoxic (against DLD-1 (colorectal cancer) and CCD-18Co (human colon fibroblast cell line)), antioxidant and enzyme inhibitory (against cholinesterases, tyrosinase, urease, alpha-amylase, and alpha-glucosidase) activities of various extracts of Scorzonera mollis subsp. szowitzii were investigated. LC-ESI-MS/MS analysis led to screen 56 phytochemical compounds with predominance of chlorogenic acid in acetone (0.118 +/- 0.010 mu g/mg) and methanol (34.105 +/- 0.012 mu g/mg) extracts and gallic acid (0.153 +/- 0.008 mu g/mg) in water extract. The methanol extract showed superior cytotoxic activity on DLD-1 with IC50 value of 19.46 +/- 0.36 mu g/ml. The highest antioxidant activity was recorded in methanol extract in beta-carotene linoleic, DPPH center dot, ABTS(center dot+), CUPRAC, and phosphomolybdenum assays with IC50 values of 16.23 +/- 0.98, 68.55 +/- 0.24, 40.32 +/- 0.27, 241.66 +/- 0.01, and 95.65 +/- 0.78 mu g/ml, respectively. All extracts exhibited varying degrees of enzyme inhibitory activity, while hexane extract (89.18 +/- 0.84%) showed a degree of urease inhibitory activity to exceed the standard (78.93 +/- 0.18%). Novelty impact statement Since the side effects of synthetic origin drugs have reached levels that cannot be ignored, the interest in scientific studies on plants and their bioactive properties has deepened. In this study, it was planned to investigate the phytochemical profile and bioactive properties of S. mollis subsp. szowitzii, a member of Scorzonera genus used as food and drugs in traditional medicine. In addition to being the first to point out the potential of S. mollis subsp. szowitzii as a natural food additive, this study proved its medicinal importance by uncovering bioactive compounds and properties.
Citation - WoS: 2
Citation - Scopus: 2
Synthesis and Application of Colloidal Cds Quantum Dots as Interface Modification Material in Perovskite Solar Cells
(Scientific Technical Research Council Turkey-Tubitak, 2021) Yenel, Esma
In this study, colloidal CdS quantum dots were synthesized, structurally characterized, and their effect on performance of perovskite solar cells was observed by using them as interface modification agent between TiO2/perovskite. Colloidal CdS quantum dots were synthesized based on two-phase method and characterized by X-ray diffraction and Transmission Electron Microscopy techniques. The average particle size of CdS quantum dots have found to be around 5 nm. Oleic acid was used as capping agent during synthesis to lead solubility in organic solvents. Obtained quantum dots are coated on compact TiO2 layer for surface modification. A decrease was observed when oleic acid capped CdS quantum dots were used at interface, while significant improvement was observed when ligand exchange was carried out by pyridine before perovskite layer. Reference solar cells showed 11.6% efficiency, while pyridine capped CdS modified solar cells' efficiency was 13.2%. Besides the improvement in efficiency, reproducibility of solar cells also was increased by using pyridine capped CdS as interface material.

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