User-oriented data acquisition chain task planningalgorithm for operationally responsive space satellite

With the development of operationally responsive space（ORS） and on-board processing techniques, the end users canreceive the observation data from the ORS satellite directly. Tosatisfy the demand for reducing the requirements-tasking-effectscycle from one day to hours, the various resources of the wholedata acquisition chain （including satellites, ground stations, dataprocessing centers, users, etc.） should be taken into an overallconsideration, and the traditional batch task planning mode shouldbe transformed into the user-oriented task planning mode. Consideringthere are many approaches for data acquisition due tothe new techniques of ORS satellite, the data acquisition chaintask planning problem for ORS satellite can be seen as the multimodalroute planning problem. Thereby, a framework is presentedusing label-constrained shortest path technique with the conflictresolution. To apply this framework to solve the ORS satellite taskplanning problem, the preprocessing and the conflict resolutionstrategies are discussed in detail. Based on the above work, theuser-oriented data acquisition chain task planning algorithm forORS satellite is proposed. The exact solution can be obtainedin polynomial time using the proposed algorithm. The simulationexperiments validate the feasibility and the adaptability of the proposedapproach.

Adaptive Modeling for Security Infrastructure Fault Response

Based on the analysis of inherent limitations in existing security response decision-making systems, a dynamic adaptive model of fault response is presented. Several security fault levels were founded, which comprise the basic level, equipment level and mechanism level. Fault damage cost is calculated using the analytic hierarchy process. Meanwhile, the model evaluates the impact of different responses upon fault repair and normal operation. Response operation cost and response negative cost are introduced through quantitative calculation. This model adopts a comprehensive response decision of security fault in three principles--the maximum and minimum principle, timeliness principle, acquiescence principle, which assure optimal response counter- measure is selected for different situations. Experimental results show that the proposed model has good self- adaptation ability, timeliness and cost-sensitiveness.

Responsible fishing operations for clean oceans,healthy ecosystems and sustainable fisheries

This special issue contains selected papers presented at the ICES-FAO Working Group on Fishing Technology and Fish Behavior mini-symposium on“Responsible Fishing Technology for Healthy Ecosystems and Clean Environment”held in Shanghai,China between 8 and 12 April 2019.The symposium was co-sponsored by Food and Agriculture Organization of the United Nations(FAO),International Council for the Exploration of the Seas(ICES)and Shanghai Ocean University,China.The meeting was chaired by Pingguo He(USA),Haraldur Einarsson(Iceland)and Liming Song(China).The special issue was edited by the following guest editors:Pingguo He(managing guest editor),Haraldur Einarsson,Liming Song,and Michael Pol,with the assistance of a number of anonymous reviewers.