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Search Result(s): 16137

Research on Construction of Conference Matrices and Transformation between Conference Matrices and Equiangular Tight Frames

Lingfei Zhang*1, Yunbo Yang2, Yilin Ge3, Yudi Cai4

Abstract | References | PDF | HTML | Pub. Date: Aug 24, 2020

DOI: 10.25236/FSST.2020.021015

An Analysis of the Classical of Mountains and Seas from Three Dimensional Transplantation --Illustrated by the case of Birrell’s English translation

Mengxue Feng

Abstract | References | PDF | HTML | Pub. Date: Aug 24, 2020

DOI: 10.25236/FSST.2020.021016

Behavioral Economics Study on Criminal Offenses by Ethnic Minorities Floating Population in Cities--with Chengdu City as Instance

Yang Quan

Abstract | References | PDF | HTML | Pub. Date: Aug 24, 2020

DOI: 10.25236/FSST.2020.021017

Bio-Inspired Surfaces for Fouling Resistance

Yingfei Huang1, Zehua Wang2, Tom Chen3

Abstract | References | PDF | HTML | Pub. Date: Aug 24, 2020

DOI: 10.25236/FSST.2020.021018

Chinese Business Culture: Identifying Misunderstandings and Offering Recommendations for American Negotiators

Xinying Hou1,*, Mingyue Tang2, Jiayi Lin3, Weibo Huang4, Jiazeng Xu5

Abstract | References | PDF | HTML | Pub. Date: Aug 24, 2020

DOI: 10.25236/FSST.2020.021019

How Did Henry Bracton's Writing Reflect the Status of Kingship and barons’ Power in Medieval England?

Xue Aiyi

Abstract | References | PDF | HTML | Pub. Date: Aug 24, 2020

DOI: 10.25236/FSST.2020.021020

Normative Research on English Translation of Tourist Attractions in Inner Mongolia

Yaoyao Gao

Abstract | References | PDF | HTML | Pub. Date: Aug 24, 2020

DOI: 10.25236/FSST.2020.021101

Reduction of the Hedging Error in the Trinomial Tree Model

Hantao Zhou1, Jiong Huang2, Qianwei Yin3

Abstract | References | PDF | HTML | Pub. Date: Aug 24, 2020

DOI: 10.25236/FSST.2020.021102

Analysis on the Current Situation and Prospect of Regional Economic Cooperation in Northeast Asia

Zhao mingxiao

Abstract | References | PDF | HTML | Pub. Date: Aug 24, 2020

DOI: 10.25236/FSST.2020.021103

The Opportunities and Challenges of Gender Mainstreaming Policies in Agricultural and Pastoral Areas: a Study on Gender Issues Related with Rights Confirmation of Grassland-Use in Inner Mongolia, China

Hongyan Wang, Hsinlun Yu

Abstract | References | PDF | HTML | Pub. Date: Aug 24, 2020

DOI: 10.25236/FSST.2020.021104

A Study on the Strategies and Practices of Promoting Intelligence in Primary and Secondary Schools Based on Stem--Take the Science and Technology Games of Primary and Secondary Schools in Quannan County as an Example

Zhong Qi1, Tang Yao1, Xiang Yuling1, Zeng Xiangzhi2

Abstract | References | PDF | HTML | Pub. Date: Aug 24, 2020

DOI: 10.25236/FSST.2020.021105

A Mask Detection System Based on Yolov3-Tiny

Guo Cheng1, Shuyang Li2, Yanheng Zhang3, Ran Zhou4

Abstract | References | PDF | HTML | Pub. Date: Aug 24, 2020

DOI: 10.25236/FSST.2020.021106

Study on the Significance of the Overall National Security Concept--Based on the Perspective of Marx and Engels’ Theory of International Relations

Deng Ruoyu

Abstract | References | PDF | HTML | Pub. Date: Aug 24, 2020

DOI: 10.25236/FSST.2020.021107

Study on the Relationship between the Obedience of Personality and the Authority of Experts and Governments

Pan Langxuan

Abstract | References | PDF | HTML | Pub. Date: Aug 24, 2020

DOI: 10.25236/FSST.2020.021108

An Overview of Sequence Logo Technique and Potential Application Direction

Zhanlin Dong

Abstract | References | PDF | HTML | Pub. Date: Aug 24, 2020

DOI: 10.25236/FSST.2020.021109

Opportunities and Obstacles Faced in Chinese Plant-Based Food Industry

Daoqi E1, Dian Yu2, Tianyi Feng3, Xihao Li4

Abstract | References | PDF | HTML | Pub. Date: Aug 24, 2020

DOI: 10.25236/FSST.2020.021110

Customer Concentration, Level of Research and Development, and Supplier’s Profitability Analysis Based on High-Tech Manufactory Industry

Guo Jingwei1, Huang Siyao2, Yin Hang3

Abstract | References | PDF | HTML | Pub. Date: Aug 24, 2020

DOI: 10.25236/FSST.2020.021111

The Relationship between Neuroticism and Self-Esteem

Guo Yuxuan

Abstract | References | PDF | HTML | Pub. Date: Aug 24, 2020

DOI: 10.25236/FSST.2020.021112

Advertisement on Tik Tok as a Pioneer in New Advertising Era: Exploring Its Persuasive Elements in the Development of Positive Attitudes in Consumers

Yu Han*

Abstract | References | PDF | HTML | Pub. Date: Aug 24, 2020

DOI: 10.25236/FSST.2020.021113

Trials and Witnesses for Witches in the Fifteen Century

Dening Li

Abstract | References | PDF | HTML | Pub. Date: Aug 24, 2020

DOI: 10.25236/FSST.2020.021114

Efficient Fraud Detection Classification: Class Imbalance and Attribute Correlations

Difei Liu1, Ruiyi Sun2, Haoyang Ren3

Abstract | References | PDF | HTML | Pub. Date: Aug 24, 2020

DOI: 10.25236/FSST.2020.021115

Analysis and Optimization of Aerodynamic Performance of Race Car Rear Wing Based on CFD

Kaicong Chen1,  Sen Liu2

Abstract | References | PDF | HTML | Pub. Date: Aug 24, 2020

DOI: 10.25236/FSST.2020.021116

Automated External Defibrillator Facility Layout Status and Recommendations in the Main Urban Area of Huzhou

Chenghao Xu

Abstract | References | PDF | HTML | Pub. Date: Aug 24, 2020

DOI: 10.25236/AJHSS.2020.030711

Kingship and Religion: the contributions of ‘Emperor Bodhisattva’ Xiao Yan promoting the Sinicization of Buddhism during the reign of the Liang Dynasty

Linggang Kong1 *

Abstract | References | PDF | HTML | Pub. Date: Aug 24, 2020

DOI: 10.25236/AJHSS.2020.030712

An Analysis of Contemporary College Students' Social Psychology------Empirical analysis based on the micro data of 19 universities

Fan Chao

Abstract | References | PDF | HTML | Pub. Date: Aug 24, 2020

DOI: 10.25236/AJHSS.2020.030713

Research on the settlement and deformation law of overlying rock under the influence of mining

Longhui Guo*

Abstract | References | PDF | HTML | Pub. Date: Aug 24, 2020

DOI: 10.25236/AJETS.2020.030517

Study on the Effective Path of Disassembly and Assembly Practical Training of Chemical Pipeline

Longjiang Liu 1,2,*

Abstract | References | PDF | HTML | Pub. Date: Aug 24, 2020

DOI: 10.25236/FER.2020.030927

Project-based Teaching Model of Physical Education Based on OBE

Pengfei Wen, Menghua Wang*

Abstract | References | PDF | HTML | Pub. Date: Aug 24, 2020

DOI: 10.25236/IJNDE.2020.020722

The Impact and Restriction of Socio-economic Downturn on the Development of Sports Industry

Yue Gu1,*

Abstract | References | PDF | HTML | Pub. Date: Aug 24, 2020

DOI: 10.25236/FSR.2020.020312

An Extensional Micmac Method to Identify the Key Factors

Jihkuang Chen

Abstract | References | PDF | HTML | Pub. Date: Aug 24, 2020

DOI: 10.25236/AJBM.2020.020508

Analysis of User Needs of Sports and Fitness Apps from the Perspective of “Healthy China”

Pengcheng Shen

Abstract | References | PDF | HTML | Pub. Date: Aug 24, 2020

DOI: 10.25236/AJBM.2020.020509

Research on Optimization of Cold Chain Logistics Distribution Path Based on P Company

Xinyan YU1, Daofang CHANG2,*, Xin SONG3

Abstract | References | PDF | HTML | Pub. Date: Aug 24, 2020

DOI: 10.25236/AJBM.2020.020511

Speech Recognition and Optimization Using Linear Classification Artificial Neural Network

Jingbo Cui1, Ting Liu2*,Xinkai Hao3*

Abstract | References | PDF | HTML | Pub. Date: Aug 24, 2020

DOI: 10.25236/FSST.2020.021117

Research on Inheritance and Reference of Excellent Traditional Culture in University Cultural Construction

Lu Jun

Abstract | References | PDF | HTML | Pub. Date: Aug 24, 2020

DOI: 10.25236/FSST.2020.021118

Downregulating Lunar1 to “Notch-Down” the Progression of Human t-All

Qitong Luan

Abstract | References | PDF | HTML | Pub. Date: Aug 24, 2020

DOI: 10.25236/FSST.2020.021119

Review on the 10-Year Development of Software Defined Networks

Yiming Tang1, Qiurong Chen2, Jiayi Xu3, Yixiao Chen4

Abstract | References | PDF | HTML | Pub. Date: Aug 24, 2020

DOI: 10.25236/FSST.2020.021120

Research on Classification of Imbalanced Data Set Based on TMDSMOTE Algorithm

Wei Sun1, Chen Cheng1,*, Gaiqing Yu1

Abstract | References | PDF | HTML | Pub. Date: Aug 23, 2020

DOI: 10.25236/FSST.2020.020802

Research on Application of Mass Concrete Structure in Civil Building Construction

Jian Yin1, Jing Yang2, Xiaohan Zhang2, Tao Lv3

Abstract | References | PDF | HTML | Pub. Date: Aug 23, 2020

DOI: 10.25236/FSST.2020.020803

Cracking analysis and optimization of stamping forming of rear longitudinal extension beam based on CAE

Xu Hao, Wang Zhao, Huang Yao, Wang LeiGang

Abstract | References | PDF | HTML | Pub. Date: Aug 23, 2020

DOI: 10.25236/FSST.2020.020804

Exploration of Cultural Tourism Paradigm in Panxi Ethnic Mixed Area--Take the Lisu Township of Xinshan, Miyi County as an Example

Xiaojun Su, Yong Tan, Wage Jishi, Wenling Fan

Abstract | References | PDF | HTML | Pub. Date: Aug 23, 2020

DOI: 10.25236/FSST.2020.020805

Research on Regional Economic Vitality Based on Mathematical Modeling

Zhang Zhe1, Zhao Rui1, Zhao Yueming1, Zhang Zhaozhen2, Yao Daohong1

Abstract | References | PDF | HTML | Pub. Date: Aug 23, 2020

DOI: 10.25236/FSST.2020.020806

The Development of the Memorial and the Oracle in the Early Qing Dynasty

Xiaohan Zhang1, Jing Yang2*, Weiqiang Zhuang3, Jian Yin4, Xuan Zhang5, Yuhang Li6

Abstract | References | PDF | HTML | Pub. Date: Aug 23, 2020

DOI: 10.25236/FSST.2020.020807

The Cause of Formation and Prevention of Impulse Crime of Contemporary College Students

Ni Pan

Abstract | References | PDF | HTML | Pub. Date: Aug 23, 2020

DOI: 10.25236/FSST.2020.020808

Swinging Identity in Zadie Smith’s Swing Time

Xiong Li 1,2

Abstract | References | PDF | HTML | Pub. Date: Aug 23, 2020

DOI: 10.25236/FSST.2020.020809

Enlightenment of Indoctrination Theory to Ideological and Political Education in the New Era

Xing Liang

Abstract | References | PDF | HTML | Pub. Date: Aug 23, 2020

DOI: 10.25236/FSST.2020.020811

Research on the Relationship between Knowledge Types of High School and Problem Solving

Xiaohong Wu

Abstract | References | PDF | HTML | Pub. Date: Aug 23, 2020

DOI: 10.25236/FSST.2020.020812

Analysis and Interpretation of the Protection of Ancient Buildings in Urban Design

Enmao Qiao, Qi Ding, Dawei Shang, Zhiguo Hou

Abstract | References | PDF | HTML | Pub. Date: Aug 23, 2020

DOI: 10.25236/FSST.2020.020813

Exploration and Practice of Grassland Ecological

An Lihong, Luo Zenghai

Abstract | References | PDF | HTML | Pub. Date: Aug 23, 2020

DOI: 10.25236/FSST.2020.020814

Research on Application of Artificial Intelligence Technology in Intelligent Manufacturing

Zhiyao Du

Abstract | References | PDF | HTML | Pub. Date: Aug 23, 2020

DOI: 10.25236/FSST.2020.020815

Research on the Application of Combined Training Methodin Football Teaching in Colleges and Universities

Qingkun Feng

Abstract | References | PDF | HTML | Pub. Date: Aug 23, 2020

DOI: 10.25236/FSST.2020.020817

The Evolution and Development of University Function-- from the perspective of higher education philosophy

Hu Hailong

Abstract | References | PDF | HTML | Pub. Date: Aug 23, 2020

DOI: 10.25236/FSST.2020.020818

Research on Urban Road Quality Improvement

Zhanru Liu1,2,*, Chuyi Xian1

Abstract | References | PDF | HTML | Pub. Date: Aug 23, 2020

DOI: 10.25236/FSST.2020.020819

Research on Rock Breaking Mechanism with PDC Impact Composite Drill

Zhihao Shi, Yingxin Yang

Abstract | References | PDF | HTML | Pub. Date: Aug 23, 2020

DOI: 10.25236/FSST.2020.020820

The Northern Wei Dynasty's View on Gaoche

ShiYu Wang

Abstract | References | PDF | HTML | Pub. Date: Aug 23, 2020

DOI: 10.25236/FSST.2020.020816

Route Alignment Based on GIS Cost Analysis

Mi Tian

Abstract | References | PDF | HTML | Pub. Date: Aug 23, 2020

DOI: 10.25236/FSST.2020.020901

Design of Music Spectrometer Based on Stm32l053

LixiaMou

Abstract | References | PDF | HTML | Pub. Date: Aug 23, 2020

DOI: 10.25236/FSST.2020.020902

Research on the Supply Mechanism of Public Information Service in Our Country

Jiaojiao Chen 

Abstract | References | PDF | HTML | Pub. Date: Aug 23, 2020

DOI: 10.25236/FSST.2020.020903

Analysis of the Trend of Global Economy after the Epidemic

Gaohao Liu

Abstract | References | PDF | HTML | Pub. Date: Aug 23, 2020

DOI: 10.25236/FSST.2020.020904

Research on the Development of Sports Industry Structure in China

Li Ka-sing

Abstract | References | PDF | HTML | Pub. Date: Aug 23, 2020

DOI: 10.25236/FSST.2020.020905

The Practicability Test of CAPM Model in China Security Market

Deng Wei

Abstract | References | PDF | HTML | Pub. Date: Aug 23, 2020

DOI: 10.25236/FSST.2020.020906

The influence of mobile media on ideological and political education in colleges and its countermeasures

Ji yuxi

Abstract | References | PDF | HTML | Pub. Date: Aug 23, 2020

DOI: 10.25236/FSST.2020.020907

Design and Implementation of Parking Management System Based on Android

SUN XieYao

Abstract | References | PDF | HTML | Pub. Date: Aug 23, 2020

DOI: 10.25236/FSST.2020.020908

Multi Instance Deep Learning Target Tracking

Cheng Huaihui1, Zhang Shengbo2

Abstract | References | PDF | HTML | Pub. Date: Aug 23, 2020

DOI: 10.25236/FSST.2020.020909

Optimization of Marketing Strategies for New Green Oil Product-Taking Motor Oil Eco7 of Avellin as an Example

Jing Wang1,Jintao Zhou1,Jia Yue2,Yingxing Chen3

Abstract | References | PDF | HTML | Pub. Date: Aug 23, 2020

DOI: 10.25236/FSST.2020.020910

Thoughts on Civil Law Protection of Personal Data in the Big Data Era

Mei Meng

Abstract | References | PDF | HTML | Pub. Date: Aug 23, 2020

DOI: 10.25236/FSST.2020.020913

Enhanced quantum spin pumping in magnetic field effect semiconductor

Yun-Chang Xiao1, Qiong Mei2 , Ri-Xing Wang1

Abstract | References | PDF | HTML | Pub. Date: Aug 23, 2020

DOI: 10.25236/FSST.2020.020914

The Inheritance and Innovation of Culture-the Mission of College English Teaching in the New Era in China

Wang Mingliang1 , Jiang zhaoxin2, Zhang Peng2

Abstract | References | PDF | HTML | Pub. Date: Aug 23, 2020

DOI: 10.25236/FSST.2020.020915

Theoretical Innovation of Human Capital Investment and Education Choice

Xing Chen

Abstract | References | PDF | HTML | Pub. Date: Aug 23, 2020

DOI: 10.25236/FSST.2020.020916

Research on College English Writing Teaching in the Context of Big Data

Huang Yabin

Abstract | References | PDF | HTML | Pub. Date: Aug 23, 2020

DOI: 10.25236/FSST.2020.020917

The Development Form and Prospect of Innovation and Entrepreneurship Education for Application-Oriented College Students

Xu Ping

Abstract | References | PDF | HTML | Pub. Date: Aug 23, 2020

DOI: 10.25236/FSST.2020.020918

Abusive Supervision Climate and Team Task Performance: the Mediated Effect of Team Identification, Team Negative Affectivity and Team Cohesion

Yueyuan Cheng*

Abstract | References | PDF | HTML | Pub. Date: Aug 23, 2020

DOI: 10.25236/FSST.2020.020919

Weight Prejudice in the Workplace in the United States

Hongyu Jin

Abstract | References | PDF | HTML | Pub. Date: Aug 23, 2020

DOI: 10.25236/FSST.2020.020920

Research on Design and Practice of Smart Classroom Teaching in Ideological and Political Courses

Liu Tao*

Abstract | References | PDF | HTML | Pub. Date: Aug 22, 2020

DOI: 10.25236/IJNDE.2020.020402

Exploring the Ways to Build a High-Level Teacher Team of Surveying and Mapping Major from the Perspective of Collaborative Innovation

Xinping Liu

Abstract | References | PDF | HTML | Pub. Date: Aug 22, 2020

DOI: 10.25236/IJNDE.2020.020403

Exploration of the Teaching Innovation Path of the History of Chinese Music in Colleges and Universities

Yao Liu

Abstract | References | PDF | HTML | Pub. Date: Aug 22, 2020

DOI: 10.25236/IJNDE.2020.020404

Effective Strategies to Improve the Teaching Quality of Aerobics in College Physical Education

Yuanli Liu1 , Xinyuan Zhang2

Abstract | References | PDF | HTML | Pub. Date: Aug 22, 2020

DOI: 10.25236/IJNDE.2020.020405

Research on the Two-Way Construction System of Innovation and Entrepreneurship Education and Ideological and Political Education of College Students

Zhuoqun Long

Abstract | References | PDF | HTML | Pub. Date: Aug 22, 2020

DOI: 10.25236/IJNDE.2020.020406

Analysis of University Implicit Ideological and Political Education Based on Social Network Support

OuYang Tian

Abstract | References | PDF | HTML | Pub. Date: Aug 22, 2020

DOI: 10.25236/IJNDE.2020.020408

The Theoretical Framework Design of College English Teaching Mode under Modern Technology

Jiandan Ren

Abstract | References | PDF | HTML | Pub. Date: Aug 22, 2020

DOI: 10.25236/IJNDE.2020.020410

The Cause of Sports Injury in Colleges and Universities and Its Safety Protection Technology

Jinli Shi1 , Zhiqiang Xie2

Abstract | References | PDF | HTML | Pub. Date: Aug 22, 2020

DOI: 10.25236/IJNDE.2020.020412

Design and Analysis of Software Application Framework Based on Web and Database Algorithm

Wang Chao

Abstract | References | PDF | HTML | Pub. Date: Aug 22, 2020

DOI: 10.25236/IJNDE.2020.020414

Significance and Strategy of Children's Reading Promotion in Children's Library of University Library

Yang Wang

Abstract | References | PDF | HTML | Pub. Date: Aug 22, 2020

DOI: 10.25236/IJNDE.2020.020415

The Optimal Design of English Translation Teaching in the Process of Understanding and Re Understanding

Lixia Wu

Abstract | References | PDF | HTML | Pub. Date: Aug 22, 2020

DOI: 10.25236/IJNDE.2020.020416

Application of Cognitive Motivation Theory in Mental Health Education

Linling Wu

Abstract | References | PDF | HTML | Pub. Date: Aug 22, 2020

DOI: 10.25236/IJNDE.2020.020417

The Construction of a New Model of Psychological Education for College Students under the Network Environment

YanwenXia1, Chuanjun Xiang2,*

Abstract | References | PDF | HTML | Pub. Date: Aug 22, 2020

DOI: 10.25236/IJNDE.2020.020418

Research and Practice on College English Listening and Speaking Modular Teaching Based on the Foreign Language Demand Oriented

Suyun Xie

Abstract | References | PDF | HTML | Pub. Date: Aug 22, 2020

DOI: 10.25236/IJNDE.2020.020419

A Study on the Current Situation and Countermeasures of College English Translation Teaching

Chunyan Mai

Abstract | References | PDF | HTML | Pub. Date: Aug 22, 2020

DOI: 10.25236/IJNDE.2020.020420

From the Perspective of International Trade to Explore the Promotion Strategy of e-Commerce Marketing Personnel Training

Chuanjiu Xu

Abstract | References | PDF | HTML | Pub. Date: Aug 22, 2020

DOI: 10.25236/IJNDE.2020.020501

An Empirical Study on the Reform of the Integration Model of Physical Education and Health Course in and out of Class

Shuxian Yi

Abstract | References | PDF | HTML | Pub. Date: Aug 22, 2020

DOI: 10.25236/IJNDE.2020.020502

Construction of the Teaching Mode of Chemical Engineering Experiment Courses Based on Discipline Competition

Lushan Yu1 , Ping Wang2* , Haofei Huang3 , Xiuxia Meng4 , Jinjin Zhang5

Abstract | References | PDF | HTML | Pub. Date: Aug 22, 2020

DOI: 10.25236/IJNDE.2020.020504

Analysis of the Influence of Western Language on the Language of Chinese Literature Based on Zhang Ailing's Works

Tao YIN

Abstract | References | PDF | HTML | Pub. Date: Aug 22, 2020

DOI: 10.25236/IJNDE.2020.020503

Realization of University Archives Resource Sharing Mechanism under the Background of Big Data

Hanlu Zhang

Abstract | References | PDF | HTML | Pub. Date: Aug 22, 2020

DOI: 10.25236/IJNDE.2020.020505

How to Realize the “Precise Supply” of Innovation and Entrepreneurship Education in Colleges and Universities

Hao Zhang

Abstract | References | PDF | HTML | Pub. Date: Aug 22, 2020

DOI: 10.25236/IJNDE.2020.020506

A Study of Computer-Aided Language Teaching in English Teaching of Civil Aviation Security

Ning Zhang

Abstract | References | PDF | HTML | Pub. Date: Aug 22, 2020

DOI: 10.25236/IJNDE.2020.020508

The Promotion of Campus Football and the Analysis of Its Diversified Competition Mode

Yue Zhang

Abstract | References | PDF | HTML | Pub. Date: Aug 22, 2020

DOI: 10.25236/IJNDE.2020.020509

The Effective Application of Modern Educational Technology in the Reform of Physical Education Teaching

Sangqing Zhao

Abstract | References | PDF | HTML | Pub. Date: Aug 22, 2020

DOI: 10.25236/IJNDE.2020.020510

Elimination Strategies of Students' Fear in Swimming Teaching

Ye Zhao

Abstract | References | PDF | HTML | Pub. Date: Aug 22, 2020

DOI: 10.25236/IJNDE.2020.020512

The Construction of “Ideological and Political Courses” Based on the Concept of “Three Integrity Education”

Xiaoping Zhu, Ruixiao Wang, Yunxiang Zhao

Abstract | References | PDF | HTML | Pub. Date: Aug 22, 2020

DOI: 10.25236/IJNDE.2020.020516

Training Strategies for Middle School Students' Ability to Play Teaching Aids in Art Teaching

YuTing Bao

Abstract | References | PDF | HTML | Pub. Date: Aug 22, 2020

DOI: 10.25236/IJNDE.2020.020517

Dichotomous Classroom Construction in Educational Psychology Teaching

PeiBin Lin

Abstract | References | PDF | HTML | Pub. Date: Aug 22, 2020

DOI: 10.25236/IJNDE.2020.020519