scholarly journals Mission Planning Issues of Imaging Satellites: Summary, Discussion, and Prospects

2021 ◽  
Vol 2021 ◽  
pp. 1-20
Author(s):  
Guohui Zhang ◽  
Xinhong Li ◽  
Gangxuan Hu ◽  
Zhibin Zhang ◽  
Jiping An ◽  
...  
Keyword(s):  
Theoretical Basis ◽  
Space Mission ◽  
Research Literature ◽  
Solution Algorithm ◽  
Mission Planning ◽  
Research Focus ◽  
Satellite Mission ◽  
Advantages And Disadvantages ◽  
Development Direction ◽  
Research Objects

Satellite mission planning is the basis and top-level work of space missions and the beginning of each space mission. Therefore, the scientific research of satellite mission planning is very important. By analyzing the existing research results, we can know that the research on task planning mainly focuses on three aspects: research objects, established model, and solution algorithm. Starting from these three aspects vertically and then horizontally, this paper comprehensively discusses the theoretical basis, application, and advantages and disadvantages of related technologies in the research literature in recent years. Finally, based on the research on satellite mission planning, this paper puts forward its own views on the future development direction and research focus.

scholarly journals Understanding students’ behavior in online social networks: a systematic literature review

2021 ◽  
Vol 18 (1) ◽  
Author(s):  
Maslin Binti Masrom ◽  
Abdelsalam H. Busalim ◽  
Hassan Abuhassna ◽  
Nik Hasnaa Nik Mahmood
Keyword(s):  
Social Networks ◽  
Literature Review ◽  
Systematic Literature Review ◽  
Online Social Networks ◽  
Theoretical Basis ◽  
Student Behavior ◽  
Cyber Victimization ◽  
Student Behaviors ◽  
Research Focus ◽  
Student Academic Performance

AbstractThe use of online social networks (OSNs) has increasingly attracted attention from scholars’ in different disciplines. Recently, student behaviors in online social networks have been extensively examined. However, limited efforts have been made to evaluate and systematically review the current research status to provide insights into previous study findings. Accordingly, this study conducted a systematic literature review on student behavior and OSNs to explicate to what extent students behave on these platforms. This study reviewed 104 studies to discuss the research focus and examine trends along with the important theories and research methods utilized. Moreover, the Stimulus-Organism-Response (SOR) model was utilized to classify the factors that influence student behavior. This study’s results demonstrate that the number of studies that address student behaviors on OSNs have recently increased. Moreover, the identified studies focused on five research streams, including academic purpose, cyber victimization, addiction, personality issues, and knowledge sharing behaviors. Most of these studies focused on the use and effect of OSNs on student academic performance. Most importantly, the proposed study framework provides a theoretical basis for further research in this context.

scholarly journals A Review of Remote Sensing Image Dehazing

Sensors ◽  
2021 ◽  
Vol 21 (11) ◽  
pp. 3926
Author(s):  
Juping Liu ◽  
Shiju Wang ◽  
Xin Wang ◽  
Mingye Ju ◽  
Dengyin Zhang
Keyword(s):  
Remote Sensing ◽  
Data Driven ◽  
Future Research ◽  
Research Focus ◽  
Image Dehazing ◽  
Surface Information ◽  
Haze Removal ◽  
Advantages And Disadvantages ◽  
Extra Information ◽  
Removal Technique

Remote sensing (RS) is one of the data collection technologies that help explore more earth surface information. However, RS data captured by satellite are susceptible to particles suspended during the imaging process, especially for data with visible light band. To make up for such deficiency, numerous dehazing work and efforts have been made recently, whose strategy is to directly restore single hazy data without the need for using any extra information. In this paper, we first classify the current available algorithm into three categories, i.e., image enhancement, physical dehazing, and data-driven. The advantages and disadvantages of each type of algorithm are then summarized in detail. Finally, the evaluation indicators used to rank the recovery performance and the application scenario of the RS data haze removal technique are discussed, respectively. In addition, some common deficiencies of current available methods and future research focus are elaborated.

scholarly journals An analysis of mobility management for mobile sensor nodes in MWSN

2018 ◽  
Vol 232 ◽  
pp. 04078
Author(s):  
Min Zhang ◽  
Jun-Bin Liang
Keyword(s):  
Mobility Management ◽  
Research Literature ◽  
Sensor Nodes ◽  
Mobile Sensor ◽  
Existing Problems ◽  
Advantages And Disadvantages ◽  
Management Schemes ◽  
Mobile Sensor Nodes ◽  
Mobile Wireless Sensor ◽  
Efficiency Data

Mobile wireless sensor networks (MWSN) are composed of a large number of mobile sensor nodes, which are used to collect data. MWSN have been widely applied in a variety of harsh environments, so mobile sensor nodes are often at risk of damage. How to manage mobile sensor nodes is an important issue. In this paper, we analyse different mobility management schemes proposed in some typical research literature and classify these schemes by using three features: the collaboration between mobile sensor nodes, routing and deployment in MWSN. We specify advantages and disadvantages of the proposed schemes, compare different key parameters of MSWN respectively, including energy efficiency, data delay, cost and lifetime, etc. Finally, we discuss existing problems of MWSN management and give some helpful suggestions in this area.

scholarly journals A GA-SA Hybrid Planning Algorithm Combined with Improved Clustering for LEO Observation Satellite Missions

Algorithms ◽  
2019 ◽  
Vol 12 (11) ◽  
pp. 231
Author(s):  
Xiangyu Long ◽  
Shufan Wu ◽  
Xiaofeng Wu ◽  
Yixin Huang ◽  
Zhongcheng Mu
Keyword(s):  
Clustering Algorithm ◽  
Simulated Annealing Algorithm ◽  
Space Mission ◽  
Theory Model ◽  
Low Earth Orbit ◽  
Mission Planning ◽  
Experimental Simulation ◽  
Two Phase ◽  
Fitness Value ◽  
Planning Algorithm

This paper presents a space mission planning tool, which was developed for LEO (Low Earth Orbit) observation satellites. The tool is focused on a two-phase planning strategy with clustering preprocessing and mission planning, where an improved clustering algorithm is applied, and a hybrid algorithm that combines the genetic algorithm with the simulated annealing algorithm (GA–SA) is given and discussed. Experimental simulation studies demonstrate that the GA–SA algorithm with the improved clique partition algorithm based on the graph theory model exhibits higher fitness value and better optimization performance and reliability than the GA or SA algorithms alone.

scholarly journals Progress in Vinyl Acetate

CONVERTER ◽  
2021 ◽  
pp. 861-867
Author(s):  
Heng Ma
Keyword(s):  
Vinyl Acetate ◽  
Synthesis Method ◽  
Raw Material ◽  
Organic Chemical ◽  
Synthesis Methods ◽  
Advantages And Disadvantages ◽  
Production Route ◽  
Film Adhesive ◽  
Development Direction ◽  
Adhesive Coating

Vinyl acetate is an organic chemical raw material of great industrial value. It is widely used in synthetic film, adhesive, coating and textile slurry. The production route of vinyl acetate is introduced, and the advantages and disadvantages of synthesis methods of vinyl acetate method, acetylene method, EDA cracking method, base synthesis method and Halcon method are compared. The method of carbide acetylene has high economic efficiency, low energy consumption and good environmental protection, proposing the development direction of ethylene acetate production technology.

College Sports Venues Management Strategy Research

2014 ◽  
Vol 971-973 ◽  
pp. 2540-2544
Author(s):  
Chun Yu Wang
Keyword(s):  
Research Methods ◽  
Theoretical Basis ◽  
Management Strategy ◽  
Management Practice ◽  
Present Situation ◽  
College Sports ◽  
Strategy Research ◽  
Advantages And Disadvantages ◽  
Sports Venues ◽  
The University

using literature, logic analysis and other research methods, to foreign colleges and universities sports venues management present situation and the domestic current situation of the sports venues management and its mode is analyzed and the research, explore the existing advantages and disadvantages of several kinds of sports venues management pattern. Put forward measures to improve the current college sports venues management in China's advice: perfecting the management mode of college sports venues; The maintenance of sports venues property; The marketization of sports venues management. Aimed at unearthing the university sports venues resources potential, promote the improvement of college sports venue management, and provide theoretical basis for the college sports venues management practice.

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