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This paper considers ship route extraction and clustering problem based on Automatic Identification System (AIS) data. For the ships with known Maritime Mobile Service Identify (MMSI), we propose a ship route extraction method by using AIS data. For ship route clustering, hierarchical clustering method is selected. We firstly define a distance between ship routes to measure the dissimilarity of them...
Hyperstructure is a topological concept that shares characteristics with both graphs and hypergraphs. The Min-Max hyperstructure equipartition with a connected constraint problem consists in partitioning a hyperstructure into K equal-sized connected parts that minimizes the maximum load in each part (the number of hyperedges assigned to each part). This problem, proved to be NP-hard, is an integer...
Daily ship traffic volume statistics and prediction are of great significance to shipping market. Reliable prediction of daily ship traffic volume can instruct shipping company to make sound judgment and decision for operational management. Because of the mobility of ships, it may be difficult to obtain the ship traffic volume automatically and frequently. This paper defines four types' daily ship...
Test nodes selection problem in QoE (Quality of Experience) measurement network is to select a few number of nodes in service network to test users’ experience information as much as possible. In this paper, test nodes selection problem with test capacity constraint is considered. To begin with, we describe it as a constrained set covering problem and develop a 0-1 integer nonlinear programming model...
The downlink scheduling is always a key problem in the wireless communication. In time of LTE and 5G, the real time multimedia is demanding more resources and flexibility. To meet this ever growing challenge for the QoE of users, a novel layered scheduler is designed in this paper, which treats the constraint of delay and the object for maximal throughput separately. Taking the fluctuations in both...
Energy aware routing has attracted a wide spread attention in the last decade. However, relatively concentrated traffic after applying energy aware strategies makes the network be vulnerable to link failure and sudden traffic bursts. It is a challenge to take enhancing network reliability into account while keeping low energy consumption. Routing each source-to-terminal request via two disjoint paths...
A Router's syslogs are a sequence of events observed and logged by the router. They have been widely used in the system security field. This paper focuses on detecting anomalous behaviors of routers by analyzing router syslogs. For syslog data pre-processing, hierarchical clustering based on counting cousin distance between event patterns is used to cluster events. In order to construct a time series,...
ERPs (Event-related Potentials) were used to study the influence of aesthetics on consumer purchase decision when product appearance is pitted against attributes that are more determinative of product performance. In this study, consumers should decide whether to buy the products with appearance and performance information in an online-shopping experiment. The stimuli were divided into four configurations...
Real-time and automatic tracking emissions of vessels can help the maritime traffic department and environmental monitoring department to study quantitatively and provide foundation for setting pollution reduction measures, and defining policies for management departments. Traditionaly method is based on fuel consumptions of vessels which need the cooperation of vessel operators; it is hard to realised...
The long term evolution (LTE) is a breakthrough technology with respect to the previous generation of cellular networks, as it is based on an all-IP architecture that aims at supporting several high quality services, such as video streaming, voice-over-internet-protocol (VoIP) and everything related to the wideband Internet access. In the recent years, VOIP service is becoming more and more popular...
Energy aware routing via rerouting traffic or traffic aggregating has received wide attention in the last decade. It is important and challenging to take network reliability into consideration to enhance the resilience to failures at the same time. In this paper, we aim to minimize energy expenditure while ensuring network reliability by restoration. As each request has an active path and disjoint...
LTE is an all IP network. The scheduling in its downlink channels is a key problem. Although many algorithms have been designed and analyzed, the QoS for the users in poor channel conditions are not enough to be ensured sometimes. We design a method to enhance the capacity of the system, which is a modifying strategy available for most existing algorithms. Our intuition is to allocate more resources...
Accurately predicting for network traffic is significant for network operation and maintenance in software-defined networks (SDN). In this paper, Multi-frequency characteristic of complex network traffic is considered, and a new algorithm named EMD-based multi-model Prediction (EMD-MMP) for network prediction is proposed. The main idea in this algorithm is to decompose the network traffic series into...
In the multiple protocol label-switched (MPLS) networks, the commodities (packets) are transmitted by the label-switched paths (LSPs). For the sake of reducing the total cost and strengthening the central management, the MPLS networks restrict the number of paths that a commodity can use. For maintaining the quality of service (QoS) of the users, the demand of each commodity must be satisfied. Under...
The feature of centralized network control logic in Software-Defined Networks (SDNs) paves a way for green energy saving. Router power consumption attracts a wide spread attention in terms of energy saving. Most research on it is at component level or link level, i.e. each router is independent of energy saving. In this paper, we study global power management at network level by rerouting traffic...
The Multimedia Information Retrieval (MIR) in the P2P networks has been widely studied. In this paper, we propose a new comprehensive similarity function to calculate the similarity of peers in the P2P networks so as to classify these peers. We also apply the relevance feedback in the process of retrieval in order to improve the speed and accuracy of retrieval. In simulation, we compare our algorithm...
The replica placement problems (RPPs) in the Content Distribution Networks have been widely studied. In this paper, the Multiple Minimum Cost Flow Model (MMCFM) with server storage constraints is proposed for the RPPs for the first time. Since traditional minimum cost flow algorithm can not be applied to solve our model, MMCFM is converted to an equivalent Mixed Integer Programming (MIP) and furthermore...
The replica placement problems (RPPs) in the Content Distribution Networks have been widely studied. In this paper, we propose an optimization model for the RPPs and design efficient algorithms to minimize the total cost of the network. The algorithms include three parts: replication algorithm preprocess, constraint p-median model and algorithm of solving constraint p-median models. In the simulation,...
In the downlink of 3G system, OVSF codes are used to be allocated to the calls with variable requesting data rate. Short decision time for each call and the low code blocking percentage can guarantee QoS of the call requests. Since the capacities of the codes are limited, the call requests may be easily blocked without proper code allocation scheme. In the paper, we propose a Max-Borrow scheme including...
One essential requirement for WSN is the reliability of the applications. Performance evaluation, therefore, is of great significance before the successful deployment of the network. In this paper, we consider the reliability based on a specific type of network lifetime. Our network lifetime is defined based on the representative consideration of coverage and connectivity and has a common application...
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