scholarly journals An innovative operation‐time‐space network for solving different logistic problems with capacity and time constraints

Networks ◽  
2021 ◽  
Author(s):  
Daniela Ambrosino ◽  
Veronica Asta
Keyword(s):  
Operation Time ◽  
Time Constraints ◽  
Space Network ◽  
Time Space

Conflict detection and resolution algorithms for UAVs collision avoidance

2014 ◽  
Vol 118 (1205) ◽  
pp. 828-842 ◽  
Author(s):  
G. Migliaccio ◽  
G. Mengali ◽  
R. Galatolo
Keyword(s):  
Collision Avoidance ◽  
Time Constraints ◽  
Deterministic Approach ◽  
Dimensional Approach ◽  
Sense And Avoid ◽  
Safety Critical ◽  
Communication Problems ◽  
Time Space ◽  
Conflict Detection And Resolution ◽  
Critical Requirement

Abstract Collision-avoidance is a safety-critical requirement to operate UAVs in non-segregated airspaces. In case of communication problems between a UAV and the corresponding pilot-in-command, a technology is required onboard the UAV to implement a capability to detect and avoid collision-hazards even autonomously. After an introduction to the problem of developing a so-called sense-and-avoid system and its avoid-function, this work presents a solution in terms of algorithms to implement the above capability. To detect and resolve potential mid-air conflicts, a geometric deterministic approach has been utilised: an intruder is modeled trough a moving-ellipsoid and a four-dimensional approach in the time-space domain provides the solution. The approach makes use of kinematics information to detect potential conflicts and to provide actions for conflict resolution, such as speed-changes in intensity and/or direction. The proposed solution also enables the UAV to meet the applicable vertical and horizontal minima of separation and to comply with real-time constraints.

scholarly journals V2G Strategy for Improvement of Distribution Network Reliability Considering Time Space Network of EVs

Energies ◽  
2020 ◽  
Vol 13 (17) ◽  
pp. 4415
Author(s):  
Hak-Ju Lee ◽  
Byeong-Chan Oh ◽  
Seok-Woong Kim ◽  
Sung-Yul Kim
Keyword(s):  
Distribution System ◽  
Network Reliability ◽  
Storage System ◽  
Energy Storage System ◽  
Test System ◽  
Space Network ◽  
Time Space ◽  
System 2 ◽  
Reliability Assessments ◽  
Failure Scenario

Reliability is an important index which determines the power service and quality provided to customers. As the demand increases continuously and the system changes in accordance with the environmental regulation, the reliability assessment in the distribution system becomes crucial. In this paper, we propose methods for improving the reliability of the distribution system using electric vehicles (EVs) in the system. In this paper, EVs are used as power supplying devices, such as a transportable energy storage system (ESS) which supplies power when fault occurs in the system, and by using a time–space network (TSN) in particular, EV capacity in accordance with the load arrival time was calculated. Unlike other existing reliability assessments, we did not use the average load of customers. Instead, by taking into account the load pattern by times, we considered the priority for load supply in accordance with the failure scenarios and failure times. Based on the priority calculated for each time of failure and failure scenario, plans for EV operation to minimize expected customer interruption cost (ECOST), the reliability index in the distribution system, were established. Finally, a case study was performed using the IEEE RBTS (Roy Billinton Test System) 2 Bus and the performance of the model proposed in this paper was verified based on the result.

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