scholarly journals Cryptography in Hierarchical Coded Caching: System Model and Cost Analysis

Entropy ◽  
2021 ◽  
Vol 23 (11) ◽  
pp. 1459
Author(s):  
Behrouz Zolfaghari ◽  
Vikrant Singh ◽  
Brijesh Kumar Rai ◽  
Khodakhast Bibak ◽  
Takeshi Koshiba
Keyword(s):  
Complex System ◽  
Network Topology ◽  
Data Transmission ◽  
System Model ◽  
Single Server ◽  
Proposed Model ◽  
Access Patterns ◽  
Coded Caching ◽  
Content Item ◽  
Simple Network

The idea behind network caching is to reduce network traffic during peak hours via transmitting frequently-requested content items to end users during off-peak hours. However, due to limited cache sizes and unpredictable access patterns, this might not totally eliminate the need for data transmission during peak hours. Coded caching was introduced to further reduce the peak hour traffic. The idea of coded caching is based on sending coded content which can be decoded in different ways by different users. This allows the server to service multiple requests by transmitting a single content item. Research works regarding coded caching traditionally adopt a simple network topology consisting of a single server, a single hub, a shared link connecting the server to the hub, and private links which connect the users to the hub. Building on the results of Sengupta et al. (IEEE Trans. Inf. Forensics Secur., 2015), we propose and evaluate a yet more complex system model that takes into consideration both throughput and security via combining the mentioned ideas. It is demonstrated that the achievable rates in the proposed model are within a constant multiplicative and additive gap with the minimum secure rates.

Data Ownership and Secure Medical Data Transmission using Optimal Multiple Key-Based Homomorphic Encryption with Hyperledger Blockchain

2021 ◽  
Author(s):  
Naresh Sammeta ◽  
Latha Parthiban
Keyword(s):  
Data Transmission ◽  
Homomorphic Encryption ◽  
Medical Data ◽  
Healthcare Sector ◽  
Transmission Model ◽  
Generation Process ◽  
Suggested Model ◽  
Blockchain Technology ◽  
Proposed Model ◽  
Data Ownership

Recent healthcare systems are defined as highly complex and expensive. But it can be decreased with enhanced electronic health records (EHR) management, using blockchain technology. The healthcare sector in today’s world needs to address two major issues, namely data ownership and data security. Therefore, blockchain technology is employed to access and distribute the EHRs. With this motivation, this paper presents novel data ownership and secure medical data transmission model using optimal multiple key-based homomorphic encryption (MHE) with Hyperledger blockchain (OMHE-HBC). The presented OMHE-HBC model enables the patients to access their own data, provide permission to hospital authorities, revoke permission from hospital authorities, and permit emergency contacts. The proposed model involves the MHE technique to securely transmit the data to the cloud and prevent unauthorized access to it. Besides, the optimal key generation process in the MHE technique takes place using a hosted cuckoo optimization (HCO) algorithm. In addition, the proposed model enables sharing of EHRs by the use of multi-channel HBC, which makes use of one blockchain to save patient visits and another one for the medical institutions in recoding links that point to EHRs stored in external systems. A complete set of experiments were carried out in order to validate the performance of the suggested model, and the results were analyzed under many aspects. A comprehensive comparison of results analysis reveals that the suggested model outperforms the other techniques.

scholarly journals Group Buying-based Data Transmission in Flying Ad-hoc Networks: A Coalition Game Approach

2018 ◽  
Author(s):  
Lang Ruan ◽  
Jin Chen ◽  
Qiuju Guo ◽  
Xiaobo Zhang ◽  
Yuli Zhang ◽  
...  
Keyword(s):  
Formation Mechanism ◽  
Coalition Formation ◽  
Data Transmission ◽  
Large Scale ◽  
Ad Hoc ◽  
Model Simulation ◽  
System Model ◽  
Throughput Maximization ◽  
Coalition Game ◽  
Group Buying

In scenarios such as natural disasters and military strike, it is common for unmanned aerial vehicles (UAVs) to form groups to execute reconnaissance and surveillance. To ensure the effectiveness of UAV communications, repeated resource acquisition issues and transmission mechanism design need to be addressed urgently. In this paper, we build an information interaction scenario in a Flying Ad-hoc network (FANET). The data transmission problem with the goal of throughput maximization is modeled as a coalition game framework. Then, a novel mechanism of coalition selection and data transmission based on group-buying is investigated. Since large-scale UAVs will generate high transmission overhead due to the overlapping resource requirements, we propose a resource allocation optimization method based on distributed data content. Comparing existing works, a data transmission and coalition formation mechanism is designed. Then the system model is classified into graph game and coalition formation game. Through the design of the utility function, we prove that both games have stable solutions. We also prove the convergence of the proposed approach with coalition order and Pareto order. Binary log-linear learning based coalition selection algorithm (BLL-CSA) is proposed to explore the stable coalition partition of system model. Simulation results show that the proposed data transmission and coalition formation mechanism can achieve higher data throughput than the other contrast algorithms.

scholarly journals A New Nonlinear Active Disturbance Rejection Control for the Cable Car System to Restrain the Vibration

Complexity ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-12
Author(s):  
Xinyan Hu ◽  
Lina Li
Keyword(s):  
Disturbance Rejection ◽  
System Model ◽  
Active Disturbance Rejection Control ◽  
Active Disturbance Rejection ◽  
The People ◽  
Disturbance Rejection Control ◽  
Proposed Model ◽  
Spring System ◽  
Linear Invariant ◽  
Mass Spring

The safety of the cable car system is very important for the lives of the people. But, it is easily affected by the environment such as the wind which causes the cable car system to have strong vibration disturbance, thus degrading the safety of the cable car system. In this paper, a new nonlinear active disturbance rejection control (ADRC) is proposed to restrain the vibration of the cable car. First, a new two-mass-spring system model is utilized to establish the cable car system model. The new translation vibration nonlinear model is derived by a linear-invariant two-mass-spring system. Then, a special nonlinear fal• is designed to restrain the vibration, and a new high-order nonlinear ADRC is presented for the cable car system. Finally, simulation results verify the feasibility and accuracy of the proposed model.

scholarly journals Effect of Short-Term Risk-Aversive Dispatch on a Complex System Model for Power Systems

2011 ◽  
Vol 26 (1) ◽  
pp. 460-469 ◽  
Author(s):  
Ronan Fitzmaurice ◽  
Andrew Keane ◽  
Mark O'Malley
Keyword(s):  
Complex System ◽  
Power Systems ◽  
System Model ◽  
Short Term

Identification of Complex System Based on Neural Network

2012 ◽  
Vol 433-440 ◽  
pp. 4342-4347
Author(s):  
Zhen Hai Dou ◽  
Ya Jing Wang
Keyword(s):  
Neural Network ◽  
Complex System ◽  
Mean Squared Error ◽  
Model Identification ◽  
Complex Model ◽  
System Model ◽  
Mathematics Model ◽  
Identification Method ◽  
Squared Error ◽  
Actual Output

In order to conquer the difficulty of building up the mathematics model of some complex system, model identification method based on neural network is put forward. By this method, according to actual sample datum, the complex model of crude oil heating furnace is identified at appropriate quantity of net layers and notes. The identification results show that output of model can basically consistent with the actual output and their mean squared error (MSE) almost is 0. Therefore, model identification method based on neural network is an effective method in complex system identification.

scholarly journals Nonlinear Synchronous Control for H-Type Gantry Stage Used in Electric VehiclesManufacturing

Energies ◽  
2019 ◽  
Vol 12 (12) ◽  
pp. 2305
Author(s):  
Ran Chen ◽  
Zongxia Jiao ◽  
Liang Yan ◽  
Yaoxing Shang ◽  
Shuai Wu
Keyword(s):  
Tracking Error ◽  
Tracking Performance ◽  
System Model ◽  
Lyapunov Analysis ◽  
End Effector ◽  
Mechanical Coupling ◽  
Synchronous Control ◽  
Linear Motors ◽  
Proposed Model ◽  
Synchronous Error

The H-type gantry stage (HGS) is widely used in electric vehicle manufacturing and other fields. However, resulting from the existence of mechanical coupling, the synchronous control problem of HGS always troubles many engineers. Most synchronization schemes were either engaged in improving each motor’s tracking performance or committed to pure motion synchronization only. However, tracking and synchronous performance are interconnected, because of the mechanical coupling. In this paper, a rigid assumed system model of HGS, concerning the effects of mid-beam rotary inertia, mid-beam stiffness, and end-effector movement, is presented. Based on the proposed model, an adaptive robust synchronous control based on a rigid assumed model (ARSCR) is proposed to improve both synchronous and tracking performance of the HGS. From the Lyapunov analysis, the proposed ARSCR can achieve the convergence of synchronous error and tracking error, simultaneously. An HGS driven by dual linear motors is built and used to perform the experimental verification. The experimental results indicate the effectiveness of the proposed method.

Multi-view collaborative modeling method for complex system

2016 ◽  
Vol 07 (03) ◽  
pp. 1650030
Author(s):  
Xiaodong Huang ◽  
Li Zhang ◽  
Jing Zhou ◽  
Yaofei Ma
Keyword(s):  
Complex System ◽  
Complete System ◽  
System Modeling ◽  
Modeling Method ◽  
System Model ◽  
Separation Of Concerns ◽  
Unified Framework ◽  
Collaborative Modeling ◽  
Semantic Models ◽  
And Storage

It is hard to model a complex system by simply combining its partial characteristics. This paper presents a multi-view collaborative modeling method for complex system. Multi users, multi subjects, multi granularities and multi models in complex system modeling are unified to multi views. The principles and schemes for the decomposition of complex systems are introduced. According to the principle of separation of concerns, a complex system can be decomposed to a variety of model views. Collaborative modeling means that the views can be associated and integrated to form complete system model through their semantic. According to the form of representation, the models are generalizes to three kinds, i.e., view models, semantic models and storage models, which provides a unified framework for conversion and mapping between the models. Under the guidance of the method, a tool for the modeling of warship C2 system is developed. Applications show that the tool can support collaborative modeling and design for C2 system outstandingly.

Design of Power Meter Reading Circuit Based on CC2430 and RS485 Bus

2014 ◽  
Vol 608-609 ◽  
pp. 494-498
Author(s):  
Xi You Liu ◽  
Hong Ying Wang
Keyword(s):  
Power Consumption ◽  
Data Transmission ◽  
Communication System ◽  
Hardware Implementation ◽  
Data Communication ◽  
System Model ◽  
Single Chip ◽  
Power Meter ◽  
Reading System ◽  
Reduced Power Consumption

The article analyze current situation of the electric meter reading system, and given circuit of the remote automatic meter reading based on single-chip system model, and introduced in detail the key part of data acquisition, data concentrator and the monitoring center software, hardware implementation. The wiring complexity of the project has been reduced by using the technology of RS485 communication for data transmission, which has been improved the reliability of data communication system, and reduced power consumption. The results show that the terminal is normal and reliable.

A Discrete Control System Model for the Traverse Grinding Process

1992 ◽  
Vol 206 (1) ◽  
pp. 19-27 ◽  
Author(s):  
Y Gao ◽  
B Jones
Keyword(s):  
Control System ◽  
System Model ◽  
Discrete Control ◽  
Grinding Process ◽  
Discrete Control System ◽  
Proposed Model ◽  
Mathematical Equations ◽  
Control System Model ◽  
Physical Laws ◽  
Traverse Grinding

A discrete control system model for the traverse grinding process is established on the basis of the physical laws associated with the process together with mathematical equations describing the workpiece radius distribution and parallelism error. The proposed system model is verified by good agreement obtained from a comparison of the theoretical radius distribution and parallelism error values based on the proposed model with those obtained from a traverse grinding experiment. The control system model is suitable for both plain and multi-diameter roller-type workpieces.

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