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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
IF 0.9 Q2 Multidisciplinary Pub Date : 2022-09-16 DOI: 10.35378/gujs.904961
Fatma GÜLER EROĞLU
This paper studies a reduced-order model based on proper orthogonal decomposition (POD) for the incompressible Navier-Stokes equations. The difficulties resulting from nonlinearity are eliminated using the variational multiscale (VMS) method. The time filter is added as a separate post-processing step to the standard VMS-POD approximation. This increases the accuracy and presents a better energy preserving scheme without adding additional computational complexity. Theoretical analyses of the method are given. Numerical experiments are presented to verify the theoretical findings.
本文研究了不可压缩Navier-Stokes方程的一个基于适当正交分解的降阶模型。利用变分多尺度(VMS)方法消除了非线性带来的困难。时间滤波器作为单独的后处理步骤添加到标准VMS-POD近似中。这提高了精度,并在不增加额外计算复杂性的情况下提供了更好的能量保持方案。对该方法进行了理论分析。数值实验验证了理论结果。
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引用次数: 0
The Class of Demi-Order Norm Continuous Operators 一类半阶范数连续算子
IF 0.9 Q2 Multidisciplinary Pub Date : 2022-09-09 DOI: 10.35378/gujs.1098503
Gül Sinem Keleş, B. Altın
In this paper, we introduce the class of demi-order norm continuous operators on a Banach lattice. We study the relationship between order-to-norm continuous operators and demi-order norm continuous operators. We also investigate some properties of the class of demi-order norm continuous operators, and it is given a characterization of a Banach lattice with order continuous by the term of the demi-order norm continuous operators.
本文引入Banach格上的一类半阶范数连续算子。我们研究了序到范数连续算子和半序范数连续算子之间的关系。我们还研究了一类半阶范数连续算子的一些性质,并用半阶范数持续算子的项刻画了一个具有阶连续性的Banach格。
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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
IF 0.9 Q2 Multidisciplinary Pub Date : 2022-09-04 DOI: 10.35378/gujs.993763
Mustafa Büyükkeçeci̇, M. C. Okur
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.
特征选择是一种用于减少数据集中特征数量的数据预处理方法。特征选择技术通过搜索整个特征空间来找到一个没有冗余和不相关特征的最优特征集。通过去除冗余和不相关的特征来降低数据集的维数,对于提高归纳学习器的性能(即准确性)和构建简单模型具有关键作用。因此,特征选择是机器学习的一项重要任务。对特征选择的明显需求引起了相当大的兴趣,并成为包括生物信息学、文本分类、图像识别和计算机视觉在内的广泛领域的重要研究课题。因此,人们提出了大量的特征选择方法,并发表了大量关于特征选择的文献。特征选择算法的质量不仅取决于它们所选择的特征的性能,还取决于它们的稳定性。因此,本研究主要关注两个主题:特征选择和特征选择稳定性。在接下来的章节中,讨论了特征选择的一般概念和方法,然后概述了特征选择稳定性和稳定性措施。
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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
IF 0.9 Q2 Multidisciplinary Pub Date : 2022-09-03 DOI: 10.35378/gujs.1090337
Özer Eroğlu, Ezgi AKTAŞ POTUR, M. Kabak, Cevriye Gencer
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.
可再生能源对环境可持续性至关重要。随着化石燃料对自然的破坏和化石燃料的消耗,使用清洁和取之不尽的可再生能源生产能源变得普遍。风能是可再生能源之一,是一种清洁能源,不会向环境排放任何有害废物。风能是一种低成本能源,主要用于发电。风速、涡轮机结构和风力涡轮机所在区域的特性等标准对产生的能量有效。在本研究中,对使用MCDM方法与风能相关的研究进行了全面回顾。根据从所审查的97项研究中获得的统计数据,可以观察到,这些国家的风能投资和在这些国家发表的科学出版物并不是线性增长的。各国风能潜力不同,各国对可再生能源的兴趣不同,这一事实被认为在这方面是有效的。虽然文献中有文章将可再生能源研究与MCDM方法一起讨论,但没有综合综述研究将风能和MCDM方法同时讨论。据我们所知,这是第一项根据多标准决策方法对风能研究进行综合评估的研究。通过这项研究,为后续研究MCDM方法在风能中的应用提供了一个框架。
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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
IF 0.9 Q2 Multidisciplinary Pub Date : 2022-09-02 DOI: 10.35378/gujs.1040277
Serkan Dikici
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.
组织工程(TE)能够开发出用受损组织和器官替代的功能性合成替代品,而不是使用自体或同种异体移植物。目前,广泛的生物材料被用作TE支架。在这些材料中,天然来源的材料是有利的,因为它们具有高度的生物相容性并支持细胞生长和功能,而合成材料则是有利的。除了合成聚合物的优点外,它们大多表现出疏水行为,限制了生物材料与细胞的相互作用,从而限制了所开发的TE构建体的功能。在本研究中,我们通过乳液模板技术评估了L-抗坏血酸2-磷酸(AA2P)对改善在聚己内酯制成的三维(3D)支架上生长的人真皮成纤维细胞(HDFs)培养的影响。我们的研究结果表明,当添加到50µg/mL浓度的HDFs生长培养基中时,AA2P可增强HDFs的代谢活性、生长和胶原蛋白生成。它显示出作为生长培养基补充剂的巨大潜力,以避免在默认情况下不受欢迎的合成生物材料上培养人类细胞的缺点。AA2P改善细胞生长和胶原沉积的潜力可能被证明是在3D PCL PolyHIPE支架上培养人类细胞的有效方法,用于各种TE应用。
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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
IF 0.9 Q2 Multidisciplinary Pub Date : 2022-08-28 DOI: 10.35378/gujs.1032517
Abdul Ahad Abro, Mir Sajjad Hussain Talpur, A. Jumani
Natural Language Processing (NLP) is the computerized approach to analysing text using both structured and unstructured data. NLP is a simple, empirically powerful, and reliable approach. It achieves state-of-the-art performance in language processing tasks like Semantic Search (SS), Machine Translation (MT), Text Summarization (TS), Sentiment Analyser (SA), Named Entity Recognition (NER) and Emotion Detection (ED). NLP is expected to be the technology of the future, based on current technology deployment and adoption. The primary question is: What does NLP have to offer in terms of reality, and what are the prospects? There are several problems to be addressed with this developing method, as it must be compatible with future technology. In this paper, the benefits, challenges and limitations of this innovative paradigm along with the areas open to do research are shown.
自然语言处理(NLP)是一种使用结构化和非结构化数据分析文本的计算机化方法。NLP是一种简单、经验强大且可靠的方法。它在语义搜索(SS)、机器翻译(MT)、文本摘要(TS)、情感分析器(SA)、命名实体识别(NER)和情感检测(ED)等语言处理任务中实现了最先进的性能。基于当前技术的部署和采用,NLP有望成为未来的技术。主要问题是:NLP在现实中能提供什么,前景如何?这种开发方法有几个问题需要解决,因为它必须与未来的技术兼容。在本文中,展示了这种创新范式的好处、挑战和局限性,以及开放的研究领域。
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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
IF 0.9 Q2 Multidisciplinary Pub Date : 2022-08-26 DOI: 10.35378/gujs.1002669
S. S. Seyitoglu, Ömer Faruk Tozlu, Emir Avcioglu
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.
全球能源危机、有限的能源资源以及能源生产对自然的破坏,促使人类更有效地利用能源和可再生能源。在这种情况下,在高能耗建筑中实施能源效率和可持续战略的重要性日益增加。在本研究中,以一个教育建筑为样本,考察了更高效的灯具替代和可再生能源发电对效率、可持续性和环境的影响。根据标准和设备供应商的数据进行计算。通过研究发现,在Hitit大学工程学院大楼和实验室使用高效LED照明代替卤素灯或荧光灯,将减少68.2%的用电量。此外,据推测,安装在学院屋顶上的太阳能系统将大大减少二氧化碳的排放,投资回收期为5.5年。在气体排放方面,安装在屋顶上的太阳能系统对环境的危害分别比天然气、褐煤和燃料油低21、45和32倍。
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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
IF 0.9 Q2 Multidisciplinary Pub Date : 2022-08-23 DOI: 10.35378/gujs.934699
Şenol Demir, S. Maden
In the paper, we introduce the class of trigonometrically convex functions and using the Hölder, Hölder-İşcan, Power-mean and Improved power-mean integral inequality together with an identity we establish some new inequalities of Ostrowski-type for functions whose second derivatives are trigonometrically convex which is a special case of h-convex functions. Some applications for special means are also given.
本文引入了一类三角凸函数,并利用Hölder,Hölder-şcan,幂均值和改进的幂均值积分不等式,以及一个恒等式,为二阶导数为三角凸的函数建立了一些新的Ostrowski型不等式,这是H-凸函数的一个特例。文中还给出了一些特殊手段的应用。
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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
IF 0.9 Q2 Multidisciplinary Pub Date : 2022-08-23 DOI: 10.35378/gujs.979370
A. Ak, Erdal Yilmaz, Sevan Katrancioglu
In this paper, a hydraulic motor controller is designed with a fuzzy supported integral sliding mode algorithm. The hydraulic system used in the study was modeled using artificial neural networks. Ability of handling nonlinearity of systems makes sliding mode controller to be a good choose for this system. The integral sliding mode controller can supply the robustness the system against the uncertainties. The basic idea of the proposed control method is to use fuzzy logic for the adaptation of the integral sliding mode control switching gain. Such adjustment reduces the chattering that is the most problem of classical sliding mode control. The equivalent control is computed using the radial basis function neural network. Simulation results of the presented method were compared with conventional PID controller results. It proved that it is more efficient to control the hydraulic system with integral fuzzy sliding mode control using neural network.
本文采用模糊支持积分滑模算法设计了一种液压马达控制器。采用人工神经网络对液压系统进行建模。系统对非线性的处理能力使滑模控制器成为该系统的一个很好的选择。积分滑模控制器可以提供系统对不确定性的鲁棒性。该控制方法的基本思想是利用模糊逻辑对积分滑模控制开关增益进行自适应。这种调整减少了经典滑模控制中最严重的抖振问题。采用径向基函数神经网络计算等效控制。将该方法的仿真结果与传统PID控制器的仿真结果进行了比较。结果表明,利用神经网络对液压系统进行积分模糊滑模控制具有较好的控制效果。
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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
IF 0.9 Q2 Multidisciplinary Pub Date : 2022-08-21 DOI: 10.35378/gujs.1120440
Kübra AKSOY ÖZLER, M. L. Hidayetoğlu, Kemal Yıldırım
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.
在这项研究中,旨在确定室内空间的色调和使用率对用户空间感知的影响。为了实现这一目标,生活空间的设计方式将有三种不同的色调(温暖、中性和凉爽),使用率分别为10%、50%和100%,并准备了数字视觉效果。共有233名受试者参加了研究问卷,并对获得的数据进行了分析。总之,根据语义分化量表,与完全着色的空间相比,被着色率较低的生活空间被更积极地感知。与以50%和100%的比例使用颜色的空间相比,以10%的比例使用暖色和冷色的空间被认为更宽敞、更漂亮,而观察到,当收到的值从正到负时,它们以10%>50%>100%的形式列出。尽管如此,还是确定了暖色使用率分别为50%和100%的空间被认为更为非正式。此外,据观察,墙壁上使用的色调和使用率的差异因性别和职业而异。因此,特别是女性和室内建筑师更喜欢使用率低的暖色空间。
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引用次数: 0
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gazi university journal of science
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