We propose a two-step variable selection procedure for high dimensional fixed censored quantile regression, in which the response subject to fixed censoring, and the dimension of the covariates, is very large, possibly much larger than the sample size . To account for fixed censoring data with multivariate covariates, we employ the ideas of informative subset-based estimator (Tang et el. (2012)) and effective dimension reduction. Under some regularity conditions, we show our procedure enjoys the model selection consistency, as long as the conditional censoring probability can be estimated consistently. We demonstrate that the first step penalized estimator with LASSO penalty can reduces the model from ultra-high dimensional to a model whose size has the same order with the true model, and the selected model can cover the true model. The second step excludes the remained irrelevant covariates by applying adaptive LASSO penalty to the reduced model obtained from the first step.

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5月6日上午，同济大学数学系师生一行来到浦东外高桥保税区，与中国人民解放军94839部队签订了“军民共建”协议，并开展了第一次的共建活动。在签约仪式上，94839部队某营教导员向我系师生介绍了部队历史、发展和目前所担负的防空任务。讲述了这支“英雄部队”在解放战争和解放初期革命战士的英勇事迹以及在和平年代为各种大型活动、城市发展保驾护航的故事，使同学们深受教育。数学系副系主任殷俊锋教授向部队官兵介绍了我系的...

演讲人：诸蜀宁博士时间：2009年3月30日（星期一）下午 2：30时地点：致远楼107室演讲人简历：1985年四川大学数学系毕业，1990年美国乔治城大学经济系获博士学位，后历任世界银行高级经济师，汇丰银行高级经理，现任渣打银行新资本协议实施办主任。欢迎大家参加

报告人：教授 University of Oregon，USA时间：2009年7月16号下午 13：30 — 17：00 （未完待续）地点：致远楼10

报告人：莫毅明 教授 （香港大学）题 目：Projective-algebraicity of minimal compactifications of non-arithmetic ball quotients时 间：2010年5月14日下午4：00-5：00地 点：数学系107会议

Let G be a simple algebraic group over a field of positive characteristic, B a Borel subgroup of G, and F the Frobenius morphism on the flag variety B = G/B. A splitting of the comorphismF#:OB→F*OB via a→ap, due to Mehta and Ramanathan, marked a breakthrough in the study of the geometry of B regardless of characteristic. We will describe a construction of a splitting of the Frobenous morphism on the algebra of distributions Dist G on G. This is joint work with Michel Gros.

多复变与复几何系列学术报告(TJ-Seminar on Several Complex Variables and Complex Geometry)演讲人: 符斯奇教授（Rutgers大学）题目：Spectrum of the d-bar-Neumann Laplacian时间：2008年1月15日 数学系106室 3：30-5：00 p. m.地点：数学系106室欢迎大家参