gazi university journal of science最新文献_第10页

An Adaptive Time Filtered Backward Euler Method for Reduced-Order Models of Incompressible Flows 不可压缩流降阶模型的自适应时间滤波后向Euler方法

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gazi university journal of science Pub Date : 2022-09-16 DOI: 10.35378/gujs.904961

Fatma GÜLER EROĞLU

引用次数: 0

The Class of Demi-Order Norm Continuous Operators 一类半阶范数连续算子

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gazi university journal of science Pub Date : 2022-09-09 DOI: 10.35378/gujs.1098503

Gül Sinem Keleş, B. Altın

引用次数: 0

A Comprehensive Review of Feature Selection and Feature Selection Stability in Machine Learning 机器学习中的特征选择和特征选择稳定性综述

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gazi university journal of science Pub Date : 2022-09-04 DOI: 10.35378/gujs.993763

Mustafa Büyükkeçeci̇, M. C. Okur

{"title":"A Comprehensive Review of Feature Selection and Feature Selection Stability in Machine Learning","authors":"Mustafa Büyükkeçeci̇, M. C. Okur","doi":"10.35378/gujs.993763","DOIUrl":"https://doi.org/10.35378/gujs.993763","url":null,"abstract":"Feature selection is a data preprocessing method used to reduce the number of features in the datasets. Feature selection techniques search the entire feature space to find an optimal feature set that is free of redundant and irrelevant features. Reducing the dimensionality of a dataset by removing redundant and irrelevant features has a pivotal role in improving the performance, i.e., accuracy, of inductive learners and building simple models. Thus, feature selection is an imperative task of machine learning. The apparent need for feature selection raised considerable interest and became an important research topic in a wide range of fields, including bioinformatics, text classification, image recognition, and computer vision. As a result, a large pool of feature selection methods has been proposed, and a considerable amount of literature has been published on feature selection. The quality of feature selection algorithms is measured not only by the performance of the features they prefer but also by their stability. Therefore, this study focuses on two topics: feature selection and feature selection stability. In the pages that follow, general concepts and methods of feature selection are discussed and then an overview of feature selection stability and stability measures are given.","PeriodicalId":12615,"journal":{"name":"gazi university journal of science","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2022-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45172651","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A literature review: Wind energy within the scope of MCDM methods 文献综述：MCDM方法范围内的风能

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gazi university journal of science Pub Date : 2022-09-03 DOI: 10.35378/gujs.1090337

Özer Eroğlu, Ezgi AKTAŞ POTUR, M. Kabak, Cevriye Gencer

{"title":"A literature review: Wind energy within the scope of MCDM methods","authors":"Özer Eroğlu, Ezgi AKTAŞ POTUR, M. Kabak, Cevriye Gencer","doi":"10.35378/gujs.1090337","DOIUrl":"https://doi.org/10.35378/gujs.1090337","url":null,"abstract":"Renewable energy sources are vital for environmental sustainability. With the damage of fossil fuels to nature and the depletion of fossil fuels over time, energy production from clean and inexhaustible renewable energy sources has become widespread. Wind energy, one of the renewable energy sources, is a clean energy source that does not emit any harmful waste to the environment. Wind energy is a low-cost energy source that is mostly used for electricity generation. Criteria such as wind speed, turbine structure, and the characteristics of the areas where the wind turbines will be located are effective on the amount of energy to be produced. In this study, a comprehensive review of the studies using MCDM methods related to wind energy is made. In the manner of the statistical data obtained from the 97 studies examined, it has been observed that the wind energy investments of the countries and the scientific publications made in these countries do not progress linearly with each other. The fact that countries have different wind energy potentials and the difference in the countries' interest in renewable energy sources is thought to be effective in this regard. While there are articles in the literature in which studies on renewable energy sources are discussed together with MCDM methods, there is no comprehensive review study in which wind energy and MCDM methods are discussed together. According to our best knowledge, this is the first study to comprehensively evaluate wind energy studies in terms of multi-criteria decision-making methods. With this study, a framework has been presented for subsequent studies on the application of MCDM methods in wind energy.","PeriodicalId":12615,"journal":{"name":"gazi university journal of science","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2022-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42044956","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Ascorbic Acid Enhances the Metabolic Activity, Growth and Collagen Production of Human Dermal Fibroblasts Growing in Three-dimensional (3D) Culture 抗坏血酸增强三维培养的人皮肤成纤维细胞的代谢活性、生长和胶原生成

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gazi university journal of science Pub Date : 2022-09-02 DOI: 10.35378/gujs.1040277

Serkan Dikici

{"title":"Ascorbic Acid Enhances the Metabolic Activity, Growth and Collagen Production of Human Dermal Fibroblasts Growing in Three-dimensional (3D) Culture","authors":"Serkan Dikici","doi":"10.35378/gujs.1040277","DOIUrl":"https://doi.org/10.35378/gujs.1040277","url":null,"abstract":"Tissue engineering (TE) enables developing functional synthetic substitutes to be replaced with damaged tissues and organs instead of the use of auto or allografts. A wide range of biomaterials is currently in use as TE scaffolds. Among these materials, naturally-sourced ones are favourable due to being highly biocompatible and supporting cell growth and function whereas synthetic ones are advantageous because of the high tunability on mechanical and physical properties as well as being easy to process. Alongside the advantages of synthetic polymers, they mostly show hydrophobic behaviour that limits biomaterial-cell interaction and consequently the functioning of the developed TE constructs. In this study, we assessed the impact of L-Ascorbic acid 2-phosphate (AA2P) on improving the culture of human dermal fibroblasts (HDFs) growing on a three-dimensional (3D) scaffold made of polycaprolactone by emulsion templating technique. Our results demonstrated that AA2P enhances the metabolic activity, growth, and collagen production of HDFs when supplemented to their growth medium at 50 µg/mL concentration. It showed a great potential to be used as a growth medium supplement to circumvent the disadvantages of culturing human cells on a synthetic biomaterial that is not favoured in default. AA2P's potential to improve cell growth and collagen deposition may prove an effective way to culture human cells on 3D PCL PolyHIPE scaffolds for various TE applications.","PeriodicalId":12615,"journal":{"name":"gazi university journal of science","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2022-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46138010","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Natural Language Processing Challenges and Issues: A Literature Review 自然语言处理的挑战和问题：文献综述

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gazi university journal of science Pub Date : 2022-08-28 DOI: 10.35378/gujs.1032517

Abdul Ahad Abro, Mir Sajjad Hussain Talpur, A. Jumani

引用次数: 1

Indoor Lighting Conversion Approach for Sustainable Energy Efficiency Applications in Campus Buildings: Hitit University Engineering Faculty Study 可持续能源效率在校园建筑中应用的室内照明转换方法:hit大学工程学院研究

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gazi university journal of science Pub Date : 2022-08-26 DOI: 10.35378/gujs.1002669

S. S. Seyitoglu, Ömer Faruk Tozlu, Emir Avcioglu

{"title":"Indoor Lighting Conversion Approach for Sustainable Energy Efficiency Applications in Campus Buildings: Hitit University Engineering Faculty Study","authors":"S. S. Seyitoglu, Ömer Faruk Tozlu, Emir Avcioglu","doi":"10.35378/gujs.1002669","DOIUrl":"https://doi.org/10.35378/gujs.1002669","url":null,"abstract":"Global energy crises, limited energy resources and damage to nature in energy production have pushed humanity to use energy more efficiently and renewable energy sources. In this context, the importance of implementing energy efficiency and sustainable strategies in buildings which consumes high energy, has increased. In this study, the effect of luminaires substition with more efficient ones and electricity production by renewable energy sources on efficiency, sustainability and environment was examined on a sample education building.The calculations were made according to standards and equipment supplier data. As a result of this study, it has been found that the use of high-efficiency LED lighting instead of halogen or fluorescence luminaires in the engineering faculty building and laboratory of Hitit University, will reduce the electricity consumption by 68.2%. In addition, it has been deduced that the solar energy system to be installed on the faculty’s roof, will significantly reduce CO2 emission, and has a payback period of 5.5 years. In terms of gas emissions, a roof-mounted solar energy system is 21, 45, and 32 times less hazardous to the environment than natural gas, lignite, and fuel oil, respectively.","PeriodicalId":12615,"journal":{"name":"gazi university journal of science","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2022-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43138927","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

New Ostrowski Type Inequalities for Trigonometrically Convex Functions Via Classical Integrals 基于经典积分的三角凸函数的新Ostrowski型不等式

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gazi university journal of science Pub Date : 2022-08-23 DOI: 10.35378/gujs.934699

Şenol Demir, S. Maden

引用次数: 0

Integral Fuzzy Sliding Mode Controller for Hydraulic System Using Neural Network Modelling 基于神经网络建模的液压系统积分模糊滑模控制器

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gazi university journal of science Pub Date : 2022-08-23 DOI: 10.35378/gujs.979370

A. Ak, Erdal Yilmaz, Sevan Katrancioglu

引用次数: 0

Effect of Wall Colors and Usage Rates on The Perception of Interior Spaces 墙壁颜色和使用率对室内空间感知的影响

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gazi university journal of science Pub Date : 2022-08-21 DOI: 10.35378/gujs.1120440

Kübra AKSOY ÖZLER, M. L. Hidayetoğlu, Kemal Yıldırım

{"title":"Effect of Wall Colors and Usage Rates on The Perception of Interior Spaces","authors":"Kübra AKSOY ÖZLER, M. L. Hidayetoğlu, Kemal Yıldırım","doi":"10.35378/gujs.1120440","DOIUrl":"https://doi.org/10.35378/gujs.1120440","url":null,"abstract":"In this study, it was aimed to determine the effects of color hues and usage rates in interior spaces on the spatial perceptions of users. With this objective, a living space was designed in a manner that would have three different color hues (warm, neutral, and cool) and usage rates at 10%, 50%, and 100% and digital visuals were prepared. A total of 233 subjects participated in the research questionnaire and the data obtained was analyzed. In conclusion, it was determined that the living spaces which were colored at a low rate were perceived more positively according to the Semantic Differentiation Scales compared to the completely colored spaces. The spaces where warm and cool colors were used at the rate of 10% were perceived as more spacious and beautiful compared to the spaces where colors were used at the rates of 50% and 100%, whereas it was observed that when the values received were from positive to negative, they were listed in the form of 10% > 50% > 100%. Despite this, it was determined that the spaces where warm colors were used at the rates of 50% and 100% were perceived as more informal. Furthermore, it was observed that the differences in the color hues used on the walls and the usage rates were changing according to genders and professions. Accordingly, it was determined that especially females and interior architects preferred even more the spaces with warm colors having a low usage rate.","PeriodicalId":12615,"journal":{"name":"gazi university journal of science","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2022-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46299596","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0