为解决高速铁路旅客服务系统(简称:旅服系统)业务终端设备数量多且统一安全接入管理权限复杂、零信任访问控制手段不足,以及传统软件定义边界(SDP,Software Defined Perimeter)零信任架构在实际应用中存在单点故障等问题,设计一种DSDP(D...为解决高速铁路旅客服务系统(简称:旅服系统)业务终端设备数量多且统一安全接入管理权限复杂、零信任访问控制手段不足,以及传统软件定义边界(SDP,Software Defined Perimeter)零信任架构在实际应用中存在单点故障等问题,设计一种DSDP(Dual-identity SDP)零信任架构,用以改造旅服系统主数据中心(简称:主数据中心)和铁路局集团公司服务器集群架构,保障其代管的车站业务终端设备接入的安全性;提出基于同态加密技术的双重认证流程算法,用以实现DSDP零信任架构下,主数据中心和铁路局集团公司SDP控制模块双向互认功能。实验结果表明:DSDP零信任架构可有效对抗劫持风险;在多用户的情况下,可保障旅服系统响应时间在合理范围内;具有可用性,可为旅服系统终端设备的统一接入与不同权限要求的零信任身份认证提供技术手段。展开更多
为了打破以往输电能力求解过程中发电机端电压维持不变的假设,提出了考虑发电约束求解最大输电能力(TTC)的新方法.根据大型风电场并网及同步发电机调速器和励磁系统等动态元件的运行限制,建立了计算输电断面最大输电能力的优化模型,并...为了打破以往输电能力求解过程中发电机端电压维持不变的假设,提出了考虑发电约束求解最大输电能力(TTC)的新方法.根据大型风电场并网及同步发电机调速器和励磁系统等动态元件的运行限制,建立了计算输电断面最大输电能力的优化模型,并采用信赖域内点法进行序列迭代求解.在信赖域内,将非线性优化问题逼近为线性规划(LP)子问题,以构造的价值函数为依据调整信赖域半径.在New England 39节点算例系统中验证了模型和计算方法的有效性.实验结果表明,考虑发电约束的输电断面最大传输能力计算结果更接近系统的实际运行情况.展开更多
The emergence of NGOs represents an organized response by civil society especially in those areas in which the state has either failed to reach or done so inadequately. NGOs have been taking a number of steps to promo...The emergence of NGOs represents an organized response by civil society especially in those areas in which the state has either failed to reach or done so inadequately. NGOs have been taking a number of steps to promote discussion and debate about climate change issues. The study was conducted to determine the role of a coastal NGO named Speed Trust in attaining resilience in response to climate change in coastal region;viz. Kalapara sub-district under Patuakhali district. The sample size of the study was 80 respondents. The study followed a mixed-method of research design. Both structured and semi-structured questionnaires were prepared for collecting quantitative and qualitative data from the respondent. The empirical data for the study were collected through personal interviewing of the respondents. The findings of the study revealed that the role of Speed Trust in attaining climate resilience of the study area was varied with the change of aspects of climate resilience. It also indicated that majority (80 percent) of the respondents perceived the idea that Speed Trust is playing moderate to highly effective role in attaining climate resilience. While only 1.2 percent had perceived as poor role in attaining resilience in response to climate change. Correlation analysis indicated that among the selected socio-economic characteristics, respondent’s education, organizational participation, training on climate resilience, consequence due to climate change and participation in climate resilience program showed positive and significant relationship with the role of Speed Trust in response to climate resilience. Step-wise multiple regression analysis explored that amongst five variables, three independent variables finally entered into the model and the contribution factors are: participation, training, and organizational participation. They are jointly accounted for 62.2 percent of the total variation with perceived role of Speed Trust in attaining climate resilience. It was also established that the absolute majority (100 percent) of the respondents had to face low to medium level problems in getting Sped Trust’s services on climate change issues.展开更多
文摘为解决高速铁路旅客服务系统(简称:旅服系统)业务终端设备数量多且统一安全接入管理权限复杂、零信任访问控制手段不足,以及传统软件定义边界(SDP,Software Defined Perimeter)零信任架构在实际应用中存在单点故障等问题,设计一种DSDP(Dual-identity SDP)零信任架构,用以改造旅服系统主数据中心(简称:主数据中心)和铁路局集团公司服务器集群架构,保障其代管的车站业务终端设备接入的安全性;提出基于同态加密技术的双重认证流程算法,用以实现DSDP零信任架构下,主数据中心和铁路局集团公司SDP控制模块双向互认功能。实验结果表明:DSDP零信任架构可有效对抗劫持风险;在多用户的情况下,可保障旅服系统响应时间在合理范围内;具有可用性,可为旅服系统终端设备的统一接入与不同权限要求的零信任身份认证提供技术手段。
文摘为了打破以往输电能力求解过程中发电机端电压维持不变的假设,提出了考虑发电约束求解最大输电能力(TTC)的新方法.根据大型风电场并网及同步发电机调速器和励磁系统等动态元件的运行限制,建立了计算输电断面最大输电能力的优化模型,并采用信赖域内点法进行序列迭代求解.在信赖域内,将非线性优化问题逼近为线性规划(LP)子问题,以构造的价值函数为依据调整信赖域半径.在New England 39节点算例系统中验证了模型和计算方法的有效性.实验结果表明,考虑发电约束的输电断面最大传输能力计算结果更接近系统的实际运行情况.
文摘The emergence of NGOs represents an organized response by civil society especially in those areas in which the state has either failed to reach or done so inadequately. NGOs have been taking a number of steps to promote discussion and debate about climate change issues. The study was conducted to determine the role of a coastal NGO named Speed Trust in attaining resilience in response to climate change in coastal region;viz. Kalapara sub-district under Patuakhali district. The sample size of the study was 80 respondents. The study followed a mixed-method of research design. Both structured and semi-structured questionnaires were prepared for collecting quantitative and qualitative data from the respondent. The empirical data for the study were collected through personal interviewing of the respondents. The findings of the study revealed that the role of Speed Trust in attaining climate resilience of the study area was varied with the change of aspects of climate resilience. It also indicated that majority (80 percent) of the respondents perceived the idea that Speed Trust is playing moderate to highly effective role in attaining climate resilience. While only 1.2 percent had perceived as poor role in attaining resilience in response to climate change. Correlation analysis indicated that among the selected socio-economic characteristics, respondent’s education, organizational participation, training on climate resilience, consequence due to climate change and participation in climate resilience program showed positive and significant relationship with the role of Speed Trust in response to climate resilience. Step-wise multiple regression analysis explored that amongst five variables, three independent variables finally entered into the model and the contribution factors are: participation, training, and organizational participation. They are jointly accounted for 62.2 percent of the total variation with perceived role of Speed Trust in attaining climate resilience. It was also established that the absolute majority (100 percent) of the respondents had to face low to medium level problems in getting Sped Trust’s services on climate change issues.
