Even though various wireless Net- work Access Technologies （NATs） with dif- ferent specifications and applications have been developed in the recent years, no single wireless technology alone can satisfy the any- ti...Even though various wireless Net- work Access Technologies （NATs） with dif- ferent specifications and applications have been developed in the recent years, no single wireless technology alone can satisfy the any- time, anywhere, and any service wire- less-access needs of mobile users. A real seamless wireless mobile environment is only realized by considering vertical and horizontal handoffs together. One of the major design issues in heterogeneous wireless networks is the support of Vertical Handoff （VHO）. VHO occurs when a multi-interface enabled mobile terminal changes its Point of Attachment （PoA） from one type of wireless access technology to another, while maintaining an active session. In this paper we present a novel multi-criteria VHO algorithm, which chooses the target NAT based on several factors such as user preferences, system parameters, and traf- tic-types with varying Quality of Service （QoS） requirements. Two modules i.e., VHO Neces- sity Estimation （VHONE） module and target NAT selection module, are designed. Both modules utilize several ＂weighted＂ users＇ and system＇s parameters. To improve the robust- ness of the proposed algorithm, the weighting system is designed based on the concept of fuzzy linguistic variables.展开更多
光伏发电安全、可靠、无污染、资源丰富且无枯竭危险,因此逐渐成为当今世界备受关注的新兴产业。然而,光伏发电项目建设周期长、涉及面广、投入资金数量庞大,项目和项目管理者面临的各种不确定性因素和各种环境因素急剧加大,伴随项目而...光伏发电安全、可靠、无污染、资源丰富且无枯竭危险,因此逐渐成为当今世界备受关注的新兴产业。然而,光伏发电项目建设周期长、涉及面广、投入资金数量庞大,项目和项目管理者面临的各种不确定性因素和各种环境因素急剧加大,伴随项目而来的各种风险日益突出,因此对光伏发电项目进行有效的风险评价具有明确的现实意义。根据光伏发电项目的典型特征,建立起更为全面的光伏发电项目风险评价指标体系,使用灰色关联度和逼近理想解的排序方法(technique for order preference by similarity to ideal solution,TOPSIS),对光伏项目的风险进行评价。结果表明,该方法是一种有效的风险评价方法。它既能对备选方案进行整体评判,又能反映备选方案内部各因素变化趋势与理想方案之间的区别,对于光伏发电项目的投资具有一定的指导作用。展开更多
文摘Even though various wireless Net- work Access Technologies （NATs） with dif- ferent specifications and applications have been developed in the recent years, no single wireless technology alone can satisfy the any- time, anywhere, and any service wire- less-access needs of mobile users. A real seamless wireless mobile environment is only realized by considering vertical and horizontal handoffs together. One of the major design issues in heterogeneous wireless networks is the support of Vertical Handoff （VHO）. VHO occurs when a multi-interface enabled mobile terminal changes its Point of Attachment （PoA） from one type of wireless access technology to another, while maintaining an active session. In this paper we present a novel multi-criteria VHO algorithm, which chooses the target NAT based on several factors such as user preferences, system parameters, and traf- tic-types with varying Quality of Service （QoS） requirements. Two modules i.e., VHO Neces- sity Estimation （VHONE） module and target NAT selection module, are designed. Both modules utilize several ＂weighted＂ users＇ and system＇s parameters. To improve the robust- ness of the proposed algorithm, the weighting system is designed based on the concept of fuzzy linguistic variables.
文摘光伏发电安全、可靠、无污染、资源丰富且无枯竭危险,因此逐渐成为当今世界备受关注的新兴产业。然而,光伏发电项目建设周期长、涉及面广、投入资金数量庞大,项目和项目管理者面临的各种不确定性因素和各种环境因素急剧加大,伴随项目而来的各种风险日益突出,因此对光伏发电项目进行有效的风险评价具有明确的现实意义。根据光伏发电项目的典型特征,建立起更为全面的光伏发电项目风险评价指标体系,使用灰色关联度和逼近理想解的排序方法(technique for order preference by similarity to ideal solution,TOPSIS),对光伏项目的风险进行评价。结果表明,该方法是一种有效的风险评价方法。它既能对备选方案进行整体评判,又能反映备选方案内部各因素变化趋势与理想方案之间的区别,对于光伏发电项目的投资具有一定的指导作用。
