e online ads trading platform plays a crucial role in connecting publishers and advertisers and generates tremendous value in facilitating the convenience of our lives. It has been evolving into a more and more complicated structure. In this paper, we consider the problem of maximizing the revenue for the seller side via utilizing proper reserve price for the auctions in a dynamical way.Predicting the optimal reserve price for each auction in the repeated auction marketplaces is a non-trivial problem. However, we were able to come up with an e cient method of improving the seller revenue by mainly focusing on adjusting the reserve price for those high-value inventories. Previously, no dedicated work has been performed from this perspective. Inspired by Paul and Michael [16], our model rst identi es the value of the inventory by predicting the top bid price bucket using a cascade of classi ers.e cascade is essential in signi cantly reducing the false positive rate of a single classi er. Based on the output of the rst step, we build another cluster of classi ers to predict the price separations between the top two bids. We showed that although the high-value auctions are only a small portion of all the tra c, successfully identifying them and se ing correct reserve price would result in a signi cant revenue li . Moreover, our optimization is compatible with all other reserve price models in the system and does not impact their performance. In other words, when combined with other models, the enhancement on exchange revenue will be aggregated. Simulations on randomly sampled Yahoo ads exchange (YAXR) data showed stable and expected li a er applying our model.

Abstract-According to the analysis of runway excursions incident data of China and world runway excursions prevention experience, this article present the importance of runway excursions prevention work in today's civil aviation safety management. Base on the analysis of domestic runway excursions incident data, this article summarize the characters of runway excursion incidents, and emphasize that runway excursion prevention should pay more attention to the potential hazard and analysis. So this article provides a potential hazard analysis model. Based on this model, the article give a framework of integrated runway excursions prevention system, and describe the levels and functions of the system, and give the suggestions on how to perform runway excursion prevention work according to the systematic framework.

No abstract

No abstract

Construction of air operators' safety assurance system is important for national civil aviation authority to perform the safety oversight work systematically and efficiently on the air operators. The system is a combination of management process, tools, information platform, which utilize system configuration model and data collection tools to accomplish the air operator system design evaluation and performance evaluation, and output the advice for national civil aviation authority inspectors to take action to improve the air operators' safety design and performance according to the regulation. Process has been designed to realize design and performance evaluation, and strengthen the safety assurance function during the air operator certification and surveillance phases. Based on the system configuration model, risk indicators, data collection tools and other tools, the system could perform configuration setting, planning, task assignment, data collection, analysis and action during the certification and surveillance. The application of the safety assurance system to different operators has been considered.