Recent advances in hardware technology have made it possible for mobile devices to interface with multiple networks of different types. In this paper, an IEEE 802.21 Media Independent Handover (MIH) based handover man...Recent advances in hardware technology have made it possible for mobile devices to interface with multiple networks of different types. In this paper, an IEEE 802.21 Media Independent Handover (MIH) based handover management architecture containing four modules is proposed and the multihoming technology is adopted to achieve Make-Before-Break vertical handover. Then the paper presents the performance analysis of the architecture and simulation in ns-2. The results substantiate the effi cacy of the architecture in improving the handover performance signifi cantly compared with the traditional Mobile IPv6 (MIPv6) based vertical handover. Besides, we design and implement this handover management architecture in our test-bed. The experimental results in a real network environment show that our proposed architecture can not only support the Make-before-break handover, but also guarantee the scalability because of the modulized design.展开更多
The fast growth of Hai Phong ports in the two last decades requires not only their upgrading facilities but also expanding port area and dredging their shipping channels(existing and new ones)that generate a huge amou...The fast growth of Hai Phong ports in the two last decades requires not only their upgrading facilities but also expanding port area and dredging their shipping channels(existing and new ones)that generate a huge amount of unused dredged materials.While all existing dumping sites in sea waters and on land get over capacity,looking for new dumping sites in sea waters is an urgent need.This study is to zone coastal waters of Hai Phong for suitable dumping sites meeting sustainable coastal management.Multi-criteria overlay analysis on GIS platform was employed with the criteria of natural conditions,environment and socio-economics for zoning coastal waters of Hai Phong.These criteria were detailed into eight subcriteria and then developed to eight GIS weighted thematic sub-layers of bottom depth,litho-hydrodynamics,ecosystems,distribution of benthos,distance to residential areas and tourist sites,distance to aquaculture area,distance to ecosystems and distance to conservation areas.Analysis results show the highly suitable zone for dredged material dumping in South,South West Hai Phong at depth below 15m to the deeper areas.Disposals of dredged materials in the zone would minimize impacts on the environment,ecology and socio-economics in surrounding waters and coastal areas.展开更多
基金supported in part by National Basic Research Program of China ("973 program") under contract No. 2007CB307101National Natural Science Foundation of China under Grant No. 60870015 and No. 60674008
文摘Recent advances in hardware technology have made it possible for mobile devices to interface with multiple networks of different types. In this paper, an IEEE 802.21 Media Independent Handover (MIH) based handover management architecture containing four modules is proposed and the multihoming technology is adopted to achieve Make-Before-Break vertical handover. Then the paper presents the performance analysis of the architecture and simulation in ns-2. The results substantiate the effi cacy of the architecture in improving the handover performance signifi cantly compared with the traditional Mobile IPv6 (MIPv6) based vertical handover. Besides, we design and implement this handover management architecture in our test-bed. The experimental results in a real network environment show that our proposed architecture can not only support the Make-before-break handover, but also guarantee the scalability because of the modulized design.
基金The authors gratefully acknowledge the support of the project coded DT-MT.2015.721the VAST project"Study on scientific basics to develop indices for sustainable use assessment of tourist beaches in North Coastal Vietnam",coded KHCBBI-01/18-20the VAST Scientific Research Support coded NVCC 23.03/20-20.
文摘The fast growth of Hai Phong ports in the two last decades requires not only their upgrading facilities but also expanding port area and dredging their shipping channels(existing and new ones)that generate a huge amount of unused dredged materials.While all existing dumping sites in sea waters and on land get over capacity,looking for new dumping sites in sea waters is an urgent need.This study is to zone coastal waters of Hai Phong for suitable dumping sites meeting sustainable coastal management.Multi-criteria overlay analysis on GIS platform was employed with the criteria of natural conditions,environment and socio-economics for zoning coastal waters of Hai Phong.These criteria were detailed into eight subcriteria and then developed to eight GIS weighted thematic sub-layers of bottom depth,litho-hydrodynamics,ecosystems,distribution of benthos,distance to residential areas and tourist sites,distance to aquaculture area,distance to ecosystems and distance to conservation areas.Analysis results show the highly suitable zone for dredged material dumping in South,South West Hai Phong at depth below 15m to the deeper areas.Disposals of dredged materials in the zone would minimize impacts on the environment,ecology and socio-economics in surrounding waters and coastal areas.
