Configuration Protocol Research Articles

Designing a New Scalable Autoconfiguration Protocol with Optimal Header Selection for Large Scale MANETs

Autoconfiguration in mobile ad hoc network (MANET) is a challenging task to be accomplished in hostile environment. Moreover, a mobile node in MANET is usually configured with a unique IP address for providing better communication and to connect it with an IP network. Essentially, the nodes in wired networks are autoconfigured using a commonly known Dynamic Host Configuration Protocol (DHCP) server. However, MANET exhibits the intrinsic characteristics (i.e., distributed, dynamic and multi-hop) in nature; hence, it is hard to adopt DHCP server for autoconfiguration of nodes in MANET without applying significant modifications in auto-configuration scheme. This paper proposes an efficient IPV6 Duplicate address Elimination Autoconfiguration protocol for MANETs (IDEAM) which comprises the member and the cluster head (CH) nodes organized in a hierarchical fashion. Further, the proposed protocol considers the global connectivity exhibiting reduced communication overhead among the nodes. Initially, our proposed auto-configuration protocol encourages the Duplicate Address Detection (DAD) operation by selecting a controller node from the prefixed group members using a joining node in the network. In other words, the DAD operation is performed perfectly by a selected controller node on behalf of the new joining node. Thus, our proposed protocol becomes more effective and behaves better in the minimization of overhead by considerably eliminating the DAD messages broadcast in the network. Also, we imposed a new Flower pollination based gray wolf optimization (FPGWO) algorithm for selecting an optimal header among the group members by considering various node parameters (i.e., node location, resources and node density) to avoid unnecessary broadcasting of additional weight messages about each node in the network. The simulation results proved the efficiency of our proposed protocol in terms of scalability and in the minimization of overhead. Also, an effectual method provided by our proposed approach enhances the activity of marginal nodes over the group for healing the network that degrades its performance followed by the splitting and merging operation.

Real-Time and Reliable Industrial Control Over Wireless LANs: Algorithms, Protocols, and Future Directions

The adoption of real-time wireless technologies within the ever-growing field of networked industrial control systems is continuously gaining popularity. Widespread sensing and actuation devices based on high-throughput wireless standards allow for an increased system mobility and lower configuration and maintenance costs. The IEEE 802.11 standard, especially in its most recent amendments, pushes performance to a very high level, theoretically approaching those of the most common real-time Ethernet networks. Its nondeterministic communication behavior, however, makes 802.11 unsuitable for mission- and safety-critical applications with high-reliability requirements, at least in its standard form. In this paper, we present several major solutions that tackled this issue to achieve real-time and reliability guarantees in wireless networked control systems, capitalizing on the strong efforts devoted to the adoption of IEEE 802.11 physical layer (PHY) technologies. We first provide a deep analysis of the 802.11 protocols in order to propose guidelines toward smart parameter selection at the data-link layer (DLL). In addition, the design of effective rate selection algorithms is considered as a way of increasing both the timeliness and reliability of data delivery. A further systematic solution is represented by real-time (RT)-WiFi, a new time-division multiple-access (TDMA)-based highly configurable DLL protocol that enables high-speed hard real-time data exchange over 802.11 networks. An important goal of this paper is also to provide a thorough comparison among different discussed solutions, in order to put in evidence their advantages and disadvantages, possibly in relation with systems based on different underlying PHYs. We will finally highlight the open challenges and future directions in this active research field.

Sedzmentation of Halloysite Nanotubes from Different Deposits in Aqueous Media at Variable Ionic Strengths

Halloysite clay is a natural nanomaterial that is attracting a growing interest in colloidal science. The halloysite aqueous dispersion stability is a key aspect for the configuration of a purification protocol as well as to establish the durability of a formulation. A physico-chemical study demonstrated the role of ionic strength and nanotube characteristic sizes on the sedimentation behavior. We highlighted the importance of the electrostatic repulsions exercised between the particles in the settling process. A protocol for image analysis has been proposed to provide robust information from time resolved optical images on the suspensions. In conclusion, we managed to correlate microscopic aspect to the peculiar sedimentation process of halloysite nanotubes.

Characterization of the Effects of Mesenchymal Stromal Cells on Mouse and Human Islet Function.

Islet transplantation has the potential to cure type 1 diabetes, but current transplantation protocols are not optimal and there is extensive loss of islet β‐cell insulin secretory function during the immediate post‐transplantation period. Studies using experimental models of diabetes have shown that the coculture of islets with mesenchymal stromal cells (MSCs) prior to transplantation improves graft function, but several variables differed among research groups (e.g., type of MSCs used and the treatment conditions). We have therefore assessed the effects of MSCs on mouse and human islets by investigating the importance of tissue source for MSCs, the coculture protocol configuration and length, the effect of activated MSCs, and different β‐cell secretory stimuli. MSCs derived from adipose tissue (aMSCs) were the most effective at supporting β‐cell insulin secretion in both mouse and human islets, in a direct contact coculture configuration. Preculture with aMSCs enhanced both phases of glucose‐induced insulin secretion and further enhanced secretory responses to the non‐nutrients carbachol and arginine. These effects required a coculture period of 48–72 hours and were not dependent on activation of the MSCs. Thus, direct contact coculture with autologous, adipose‐derived MSCs for a minimum of 48 hours before implantation is likely to be an effective addition to human islet transplantation protocols. stem cells translational medicine 2019;8:935&944

Discrete event system framework for fault diagnosis with measurement inconsistency: case study of rogue DHCP attack

Fault detection and diagnosis &#x0028 FDD &#x0029 facilitates reliable operation of systems. Various approaches have been proposed for FDD like Analytical redundancy &#x0028 AR &#x0029, Principal component analysis &#x0028 PCA &#x0029, Discrete event system &#x0028 DES &#x0029 model etc., in the literature. Performance of FDD schemes greatly depends on accuracy of the sensors which measure the system parameters. Due to various reasons like faults, communication errors etc., sensors may occasionally miss or report erroneous values of some system parameters to FDD engine, resulting in measurement inconsistency of these parameters. Schemes like AR, PCA etc., have mechanisms to handle measurement inconsistency, however, they are computationally heavy. DES based FDD techniques are widely used because of computational simplicity, but they cannot handle measurement inconsistency efficiently. Existing DES based schemes do not use Measurement inconsistent &#x0028 MI &#x0029 parameters for FDD. These parameters are not permanently unmeasurable or erroneous, so ignoring them may lead to weak diagnosis. To address this issue, we propose a Measurement inconsistent discrete event system &#x0028 MIDES &#x0029 framework, which uses MI parameters for FDD at the instances they are measured by the sensors. Otherwise, when they are unmeasurable or erroneously reported, the MIDES invokes an estimator diagnoser that predicts the state&#x0028 s &#x0029 the system is expected to be in, using the subsequent parameters measured by the other sensors. The efficacy of the proposed method is illustrated using a pump-valve system. In addition, an MIDES based intrusion detection system has been developed for detection of rogue dynamic host configuration protocol &#x0028 DHCP&#x0029 server attack by mapping the attack to a fault in the DES framework.

DHCP Hierarchical Failover (DHCP-HF) Servers over a VPN Interconnected Campus

This work presents a strategy to scale out the fault-tolerant dynamic host configuration protocol (DHCP) algorithm over multiple interconnected local networks. The proposed model is open and used as an alternative to commercial solutions for a multi-campus institution with facilities in different regions that are interconnected point-to-point using a dedicated link. When the DHCP scope has to be managed and structured over multiple geographic locations that are VPN connected, it requires physical redundancy, which can be provided by a failover server. The proposed solution overcomes the limitation placed on the number of failover servers as defined in the DHCP failover (DHCP-F) protocol, which specifies the use of one primary and one secondary server. Moreover, the presented work also contributes to improving the DHCP-F specification relative to a number of practical workarounds, such as the use of a virtualized DHCP server. Therefore, this research assumes a recovery strategy that is based on physical servers distributed among different locations and not centralized as clustered virtual machines. The proposed method was evaluated by simulations to investigate the impact of this solution in terms of network traffic generated over the VPN links in order to keep the failover service running using the proposed approach.

The Impact of Client-Server Configurations on Robotics

Objective: In this work, we discuss that neighborhood and connection level affirmations are never contrary. Methods/Statistical Analysis: Our investigation is principled. Considering the earlier models our model is practically identical, yet will truly comprehend this point. We expect that all aspects of our system learn e-business, are independent of each other portion. We use our as of late thought about results as a purpose behind these assumptions. Findings: Our general assessment technique tries to demonstrate three theories: (1) that streak memory throughput is less imperative than RAM speed while augmenting clock speed; (2) that we can do a lot to affect a calculation\'s ROM throughput; lastly (3) that the PDP 11 of yesteryear really displays preferable mean inertness over the present equipment. Application: All products are gathered utilizing GCC 0.5.2, Service Pack 2 connected against exceptionally accessible libraries for architecting sensor systems. We made the majority of product accessible under a GPL Version 2 permit. Keywords: Dynamic Host Configuration Protocol (DHCP), Input/Output (I/O), eXtensible Markup Language (XML).

Mobility Management through Scalable C/U-Plane Decoupling in IoV Networks

The concept of Internet-of-Vehicles (IoV) has been recently proposed to provide diverse vehicle control and on-board infotainment services while improving road safety and transportation intelligence. However, with the increased number of on-road vehicles and their mobility, conventional C/U-plane coupled architecture, which incurs high latency and low reliability, brings many challenges to the future deployment and operation of vehicular networks. Meanwhile, the tightly coupled network functions with operating hardware in network equipment also hinders new service provisioning in IoV. In order to address these issues, we propose a novel IoV framework by exploiting the potential of C/U-plane decoupled network architecture and Software Defined Networking technology. To satisfy the requirements of Ultra-Reliable and Low Latency Communications in IoV, a virtualized radio access network, an integrated caching-computing- analyzing module, a scalable hierarchical C/U-plane scheme, and the corresponding programmable protocol configuration are developed to support the proposed framework. Mobility management, especially C-plane handoff management, is then analyzed through a typical case study. The analysis and simulation results have demonstrated that the proposed framework can dramatically reduce latency and enhance reliability.

Dynamic Multiple Access Configuration in Intelligent Lifi Attocellular Access Points

The exponential growth in the global demand for wireless connectivity calls for efficient and reliable management of the available wireless resources. Light fidelity (LiFi) harnesses the vast untapped wireless transmission resources in the infrared spectrum and visible light spectrum to create ultra-dense wireless networks which support user mobility, multiuser access, and handover. Various multiuser access (MA) protocols have been developed to meet the varying system requirements, including orthogonal multiple access (OMA) and non-orthogonal multiple access (NOMA) schemes. While NOMA, on the one hand, allows for significant enhancement in the achievable data rates, its performance may be severely degraded under particular conditions such as a large number of connected users or users existing in highly symmetrical locations. OMA, on the other hand, provides better link reliability in such scenarios but at the expense of decreased spectral efficiency. Therefore, there is a need to enable a degree of intelligence in the LiFi access point (AP) to facilitate real-time configuration of the MA protocol. To this end, this paper develops a novel cross-layer design framework for dynamic multiple access selections (DMAS) in intelligent LiFi APs. The developed framework runs at LiFi attocell system level and can be configured to cater for various system requirements in terms of sum data rate, average outage probability, and fairness. The obtained results show that DMAS introduces an effective solution for multiuser resource allocation by achieving better satisfaction of the system requirements compared to the static configuration of a single MA scheme.

Оцінка пропускної здатності бездротового каналу стандартів IEEE802.11 за використання протоколів IPv4 та IPv6

Transmission of data through wireless communication channels is carried out by the TCP / IP protocol stack. This stack of protocols should be hardware-independent, that is, applied regardless of which operating systems it operates, which communication channels are used. It provides universality to data transfer systems, however, it can negatively affect the operation of transmission channels, in particular wireless networks that have a limited data rate. Increasing redundancy in the formation of data packets may reduce the bandwidth of the channel and, accordingly, the speed of the channel. For wireless communication channels, IEEE802.11 standards achieve high speeds through the use of MIMO spatial multiplexing technology and channel bandwidth expansion through the use of 2.4 GHz and 5 GHz bands, which also use packet data and various types of IP addressing. Systems with different types of IP addressing can use Dynamic Host Configuration (DHCP) protocols, which allow to automatically receiving the required parameters for network operation. According to protocol specification, IP addressing will affect the dimension of packets and the order of its formation. Estimating the performance of using protocols of various versions is possible with the help of maximum and average values of delta, maximum and average jitter (as variation of delay), packet delays, and bandwidth. The analysis of possible options for improving network parameters, when applying a certain network architecture, including a two-stacked network, is a transition technology in which IPv4 and IPv6 work in tandem with a general or dedicated link; tunneling to create an overlay network that tunnels one protocol by another, encapsulating IPv6 packets in IPv4 packets and IPv4 packets in IPv6 packets; Broadcasts that facilitate the exchange of data between hosts and networks only for IPv6 and only for IPv4 by executing an IP header and converting addresses between two groups of addresses, domain name mapping, and IP addresses of the DNS protocol. The purpose of this article is to study changes in the characteristics of the information parameter of the wireless communication channel IEEE802.11 standards when using IPv4 and IPv6 protocols of different types.

Research and Exploit of Resource Sharing Strategy at IHEP

At IHEP (Institute of High Energy Physics, Chinese Academy of Sciences), computing resources are contributed by different experiments including BES, JUNO, DYW, HXMT, etc. The resources were divided into different partitions to satisfy the dedicated experiment data processing requirements. IHEP had a local Torqu&Maui cluster with 50 queues serving for above 10 experiments. The separated resource partitions leaded to imbalance resource load. In a typical situation, BES resource partition was quite busy without free slot but still with lots of jobs in idle, while JUNO resources are free and wasted seriously. After moving resources from Torque&Maui to HTCondor in 2016, job scheduling efficiency has been improved a lot. In order to balance the imbalance resource load, we designed an efficient sharing strategy to improve the overall resourceutilization. We created an unified pool shared by all experiments. For each experiment, resources are divided into two parts: dedicated resource and sharing resource. The slots in dedicated resource only run jobs from its own experiment, and the slots in sharing resource are shared by jobs from all experiments. Default ratio of dedicated resource to sharing resource is 1:4. To maximize the sharing effectiveness, the ratio is dynamically adjusted between 0:5 and 4:1 based on the number of jobs submitted by each experiment. We have developed a central control system to decide how many resources can be allocated to each experiment group. This system is implemented at two sides: server side and client side. A management database is built at server side, which is storing resource, group and experiment information. Once the sharing ratio needs to be adjusted, resource group will be changed and updated into database. The resource group information is published to the server buffer in real-time. The client periodically pulls resource group information from server buffer via https protocol And resource scheduling configuration at client side is changed based on the resource group information. With this method, share ratio can be modified and deployed dynamically. Sharing strategy is implemented with HTCondor. ClassAd mechanism and accounting-group in HTCondor facilitate to utilizethe sharing strategy at IHEP computing cluster. With the sharing strategy, resource usage has been improved dramatically.

Authentication and Privacy Approach for DHCPv6

Dynamic Host Configuration Protocol for IPv6 (DHCPv6) is used to allocate and distribute IPv6 addresses and network configuration parameters to DHCPv6 clients. Two well-known issues of DHCPv6 are privacy concerns due to lack of protection of client information in transit, and lack of verification mechanism that allows attackers to inject fake network configuration parameters into the network undetected. This paper proposes DHCPv6 security (DHCPv6Sec) approach that is based on a hybrid cryptosystem to provide authentication for the DHCPv6 server messages and to protect the privacy of the DHCPv6 client. The DHCPv6Sec was evaluated and compared to the Secure-DHCPv6 in terms of processing time, traffic overhead, rogue DHCPv6 server prevention, privacy protection, and DHCPv6 message size limitation. The experiment results show that the DHCPv6Sec has 52% less processing time; 74% less traffic overhead; and remarkable superiority in all aspects measured.

Performance Evaluation of Distribution Node in Case of LEACH Implementation on Wireless Sensor Network

Wireless sensor networks consisting of sensor nodes can be used as an effective tool for collecting data in various situations. Nodes are usually placed randomly in an area to perform sensing and monitor various parameters related to environmental conditions in various locations. One of the major problems in wireless sensor networks is developing energy-efficient routing protocols that have a significant impact on the overall life of sensor networks so it is important to make energy savings in these limited energy sources to extend network life. This paper proposes a hardware design and Low-Energy Adaptive Clustering Hierarchy (LEACH) routing protocol configuration for power saving by utilizing cluster head selection mechanism. The cluster head selection process is performed periodically based on LEACH algorithm enables the node to have the best lifetime responsible for communication between the nodes and the server as well as the effort to save energy consumption of limited energy sources to extend network life. So that makes the process of sending information more effective and optimal. The system has been able to display data information along with the position of nodes in the web server with an average of 42 seconds of computing time in a rotation of the system so that it can be done 85 times in 1 hour. The system is able to provide real-time information with a throughput of more than 1.052 Kbps and packet loss of no more than 6.7%. In addition, energy savings can up to 6.5% of the existing energy in a lithium battery.

Monitoring coincident clicks in differential-quadrature-phase shift QKD to reveal detector blinding and control attacks

Side-channel attacks manipulating single-photon detectors (SPDs) have known to be loopholes in realistic quantum key distribution (QKD) systems. Although measurement-device-independent (MDI) QKD schemes have been proposed and studied to avoid those loopholes, they are not easy to implement in practice because they Require some synchronization between signals sent from two distant parties. In this paper, we propose a new countermeasure against a side-channel attack (control blinding and controlling attacks). It utilizes coincident clicks in differential-quadrature-phase shift (DQPS) QKD systems. Our scheme requires no change in the system configuration of the conventional protocol. Unlike MDI-QKD, side-channel attacks can be found without difficulty in practical implementations.

Denial of Service Attack over Secure Neighbor Discovery (SeND)

IPv6, the Internet Protocol suite version 6, uses a Neighbor Discovery Protocol (NDP). NDP mainly replaces router discovery and the Address Resolution Protocol (ARP) and thereafter redirects the functions used in IPv4 i.e. the Internet Protocol suite version 4. The NDP system is a stateless protocol since it does not need the dynamic host’s configuration protocol server to enable the various IPv6 nodes for determining the connected hosts along with the IPv6 network routers. To add layers of protection to NDP, the SeND (Secure Neighbor Discovery) extension was developed, which provides router authorization, proof of address ownership, and message protection for the protocol. SeND employs CGAs (Cryptographically Generated Addresses) and X.509 certificates. Despite its many advantages, deploying SeND is not easy, and it is still vulnerable to certain DoS (Denial-of-Service) attacks. The components of SeND and its responses to NDP threats are further elaborated in this paper. In addition, an overview of the implementation of SeND, its limitations, existing vulnerabilities, and current deployment challenges are also presented. Furthermore, to test the performance of SeND under a DoS attack, a test bed was implemented and the results discussed.

Robustness of Textural Features to Predict Stone Fragility Across Computed Tomography Acquisition and Reconstruction Parameters

Previous studies have demonstrated that quantitative relationships exist between stone fragility at lithotripsy and morphological features extracted from computed tomography (CT) scans. The goal of this study was to determine if variations in scanner model, patient size, radiation dose, or reconstruction parameters impact the accuracy of the prediction of renal stone fragility in an in vitro model. Sixty-seven kidney stones were scanned using routine single and dual energy stone protocols, mimicking average, and large patient habitus. Low dose scans were also performed. Each scan was reconstructed with routine protocol parameters, and with thinner (0.6 mm) or thicker (3 mm) images, two different reconstruction kernels, and iterative reconstruction at two strengths. Fragility of each stone was measured in a controlled ex vivo experiment. A single predictive model was developed from a reference CT protocol configuration and applied to data from each CT acquisition and reconstruction parameter tested to obtain estimated stone comminution times. None of the investigated protocols showed a significant variation in the accuracy of stone fragility classification, except for the ones with the most aggressive iterative reconstruction and/or with thicker images. In these protocols, a number of stone fragility assessments changed from fragile to hard (or vice versa), compared to their ground truth measurement. Prediction accuracy of stone fragility models developed from CT data is robust to expected variations in CT stone protocols used for quantification tasks. This finding facilitates their future adoption to different clinical practices.

Experimental demonstration of 50 Gb/s (2 × 25 Gb/s) TDM/WDM PON over 64-way power split using O-band up/down transmission over 20 km with dynamic bandwidth allocation and SDN control

For the accommodation of mobile, business, and residential service in the same optical distribution network, we experimentally demonstrate 50 Gb/s (25 Gb/s × 2 wavelengths) wireless and wired service converged optical access network with 64-way power split over 20 km of single mode fiber in 1300 nm band. Applying simple Reed-Solomon based forward-error-correction and a cost-effective avalanche photodiode receiver without using an optical amplifier realize the 64-way power split. Accommodating dynamic bandwidth allocation and open interface control with OpenDaylight (ODL) controller via network configuration protocol (NETCONF) interface are demonstrated. Furthermore, error-free packet transmission of 50 Gb/s with low latency and guaranteed bandwidth are successfully demonstrated.

CABS-flex standalone: a simulation environment for fast modeling of protein flexibility.

SummaryCABS-flex standalone is a Python package for fast simulations of protein structure flexibility. The package combines simulations of protein dynamics using CABS coarse-grained protein model with the reconstruction of selected models to all-atom representation and analysis of modeling results. CABS-flex standalone is designed to allow for command-line access to the CABS computations and complete control over simulation process. CABS-flex standalone is equipped with features such as: modeling of multimeric and large-size protein systems, contact map visualizations, analysis of similarities to the reference structure and configurable modeling protocol. For instance, the user may modify the simulation parameters, distance restraints, structural clustering scheme or all-atom reconstruction parameters. With these features CABS-flex standalone can be easily incorporated into other methodologies of structural biology.Availability and implementationCABS-flex standalone is distributed under the MIT license, which is free for academic and non-profit users. It is implemented in Python. CABS-flex source code, wiki with examples of use and installation instructions for Linux, macOS and Windows are available from the CABS-flex standalone repository at https://bitbucket.org/lcbio/cabsflex.

In-Vehicle Infotainment 시스템에서 Configuration Protocol의 설계 및 구현

In-Vehicle Infotainment 시스템에서 Configuration Protocol의 설계 및 구현

Maximization of Lifetime of Wireless Sensor Network with Sensitive Power Dynamic Protocol

A vitality effective protocol configuration is a key testing issue in a network of Wireless Sensor. A portion of the few existing vitality effective protocols plots dependably forward the bundles through the base vitality based ideal course to the sink to limit vitality utilization. It causes a disturbed dispersion of remaining vitality between sensor nodes, which prompts partitioning of the network. The prime objective of this method is to pass the data packets to destination node through the vitality denser range within Sensor Networks Lifetime. The current procedure Energy Balanced Routing Protocol (EBRP) neglects to accomplish Throughput, Delay part, keeping in mind the end goal to enhance the Network Lifetime and Performance so the proficient steering convention is required with the abilities of both the Power Efficient and Power Balancing. To resolve this problem, this manuscript proposed Impediment Sensitive Power Unbiased Dynamic Routing Protocol (ISPUDRP). The proposed steering system accomplishes as far as End-to-End Delay, Throughput and Lifetime of network. This manuscript shows that proposed calculation accomplishes better execution performance than the current strategies.