Integration and Scheduling Methods of Authentications for Multiple E-tickets

• Main Authors: Chin-Cheng Chang, 張至誠
• Other Authors: Mong-Fong Horng
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/00420068270117002729

碩士 === 國立高雄應用科技大學 === 電子工程系 === 98 === Intelligent Transportation System, ITS in Taiwan has been fast developed in the recent years. Electronic tickets also have considerable growth. In order to take public transit via using much more convenient electronic tickets, the integration of ticket certificated mechanisms will be the critical point in the current development of intelligent transit system. In current, the ticket certificated mechanisms of intelligent transit system are all one-to-one approaches, and have a profit from simple and fast. After integrating ticket certificated system, there will be several Security Access modules (SAM) (Ticket certificated model) in ticket certificated machine, and the type of ticket certificated mechanisms will become the one-to-multiple approach. However, the one-to-multiple approach has to perform certification between tickets and certified models one by one. This process might greatly increase the spending time needed by certificating and further decrease the performance of ticket certificated mechanism. In this study, we proposed three kinds of certificated scheduling: the adjustment mechanism of Dynamic Priority certified scheduling (DP), the detection mechanism of Minimum-Priority Guarantee for Dynamic Scheduling (MPGD), and the classification mechanism of Group-based Dynamic Priority Scheduling (GDP). The DP adjustment mechanism can dynamically adjust the tickets and the corresponding priority of the certified modules to reduce repeated times of tickets, according to the tickets which have accomplished certified procedure. The MPGD detection mechanism can guarantee the minimum priority of the default module to avoid that the tickets with higher priorities were influenced by the dynamic adjustment, and cause the degradation of the certified priority of the default module. The GDP classification mechanism can classify the ticket certified modules with lower certified priorities into the same group to enhance the certified priority of this kind of ticket module and simplify the procedure of certification, and then, to reduce the times of certification. The ticket pattern was simulated via Uniform distribution and Poisson distribution in this study, and the average certificated times could decrease by 66.8%, 66.9%, and 66.5% for Uniform distribution, and 33.1%, 33.4% and 33.2% for Poisson distribution, respectively. Our proposed approach was verified that it could effectively enhance the performance of certification according to the experimental results.