FlexBeamOpt: Hybrid solution methodologies for high-throughput GEO satellite beam laydown and resource allocation

Modern satellite communication systems are required to serve heterogeneous and geographically dispersed user demands with limited resources. In this paper, we investigate methodologies for dynamic resource allocation in Geosynchronous Earth Orbit (GEO) High-throughput Satellite (HTS) systems. We designed three solution approaches FlexBeamOpt v1 , FlexBeamOpt v2 , and FlexBeamOpt v3 , each as a hybridization of custom heuristics, integer linear programming, and/or constraint programming. We test the performance of the three approaches on 12 test instances that vary in user distribution (realistic, random, and clustered), user numbers (500 vs. 5000 users), and demand distribution (uniform vs. random). We observed that FlexBeamOpt v1  consistently outperformed FlexBeamOpt v2  and FlexBeamOpt v3  in terms of demand coverage and number of users covered for realistic and random user distribution test instances but at the cost of computation time. FlexBeamOpt v3  is the fastest in these instances. For clustered user distribution instances, FlexBeamOpt v3  performed better in terms of demand coverage and number of users covered, at the cost of using more beams. For these test instances, FlexBeamOpt v2  is the fastest in terms of computation time while providing a comparable solution quality.     

瓦楞纸箱的印刷研究

讨论了印刷方式对瓦楞纸箱抗压强度的影响，提出了瓦楞纸箱的印刷采用柔性版印刷的优点。介绍了柔性版印刷制版，油墨以及柔印开槽等系列技术问题。