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With the development of deep space exploration, the requirements of accuracy and real time for navigation services become higher, so that the traditional ground based network can hardly meet the user's needs. And the accuracy of existing autonomous navigation method, such as celestial navigation, cannot meet the requirement either. In order to improve the performance of autonomous navigation for deep...
In this paper, we propose an analytical framework for energy saving and outage performance of two-tier heterogeneous networks with traffic-based varying inter-tier dependence. Firstly, the Macro Base Station (MBS) tier and Pico Base Station (PBS) tier are deployed following a Poisson Point Process (PPP) and a Poisson Hole Process (PHP) respectively. Then, the exclusion radius of the MBS is designed...
This paper presents a human reliability analysis method based on cognitive process model. Human cognitive processes are modelled in different forms under different risk scenarios respectively. The cognitive process model consists of an event tree based on human cognitive process and Bayesian networks modelling the cognitive phases. The Bayesian networks (combining with evidence theory) use hierarchical...
Because of the benefits for both passengers and freight, the demand to travel by rail is ever increasing. Of course, it takes it for granted that it is of utmost important for railway administrators to carry passengers and freight safely to their destinations. Undergoing safety procedures and developing safety systems require awareness of what is causing unsafe conditions. Generally speaking, railway...
Based on 1,130 valid questionnaires with new employees, this paper explores the mediating effect of person-organization fit between organizational socialization and work performance of new employees from the perspective of interaction between an organization and its new employees through factor analysis, descriptive statistics, correlation analysis, second-order confirmatory factor analysis, multiple...
A large-scale deployment of femto BSs (FBSs) will result in the substantial energy consumption. One fairly intuitive way to improve energy efficiency for femtocells is a sleep mode where the FBS periodically transmits pilot signal especially in low traffic scenario. Nevertheless, it is inefficient when not involved an active call in the FBS coverage area. To address this issue, this paper proposes...
In this paper, predator-prey model of Holling III-function response with nonlinear density dependent was discussed by the differential equation qualitative theory, the properties of equilibrium was analysed and the sufficient condition of existence and uniqueness of the limit cycle was obtained.
Femtocell is a small access point using the wire broadband connections or wireless technologies to access the mobile operator's network for the user equipment(UE), which can provide better indoor coverage and satisfy the upcoming demand of high data rate for wireless communication system.Femtocell related handover cost reduction is one of the important targets in LTE-Advanced SON (Self-Organising...
Home eNodeB (HeNB) is a low-power access point using the local broadband connections or a separate RF backhaul to access the mobile operator's network for the user equipment(UE), which can provide better indoor coverage and satisfy the upcoming demand of high data rate for users. Considering the potential frequent mobility between HeNB-HeNB and HeNBeNB, HeNB mobility enhancement is proposed as one...
Independent board directors have a compelling obligation for listed companies' illegal activities, and their performance has a direct effect on the listed companies' illegal activities. The incentives to independent directors are the main influencing factors in their responsibility fulfillment. From the perspective of independent directors, this paper studies the correlation between the allowance-incentives...
Level crossings are defined as passive and automated ones. Traffic risk of the automated level crossing is analyzed and estimated. The function and the dependability of the level crossing control system are modeled based on the stochastic Petri nets. The relationship between the national statistic data and the densities of the road users and railway train is set up and a mathematical function is used...
In orthogonal frequency division multiplexing networks, inter-cell interference results in poor performance, especially universal frequency reuse scheme has already been used. Soft Frequency Reuse (SFR) scheme, one of the most promising inter-cell interference coordination (ICIC) schemes, has been introduced in LTE-Advanced networks. In this paper, We develop an analytical queueing model for the SFR...
The applicable CENELEC standards as well as the safety directive of the European parliament expect defining safety requirements for railway control functions and system constituents according to the global safety targets which are to be used for quantification of tolerable risk of the railway operation. This target is achieved by holistic modeling, risk definition and hazard analysis of all the influencing...
This paper presents a formal approach to model the traffic operational processes on a Maglev train example based on Stochastic Petri nets. The Maglev train is modeled with respect to process, function and dependability. Process model describes the normal running status and abnormal protected status of the Maglev train from departure to stopping and function model shows the working principle of propulsion...
The intelligent emergency response system was developed to compute and simulate the spread of hazardous materials leak with WebGIS when emergency happens, such as hazardous material leak accidents. In the system, much of data correlative to the rescuing strategy, such as geography location details, the spread concentration changes with time, the population distribution around, the rescue force around,...
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