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Introduced by Borcherds, vertex operator algebra is a new algebra object arising from both mathematics and physics. In this expository talk, we will discus the origins and recent developments of vertex operator algebra. In particular, we will present a connection between vertex operator algebras and the modular forms.

Structures of dual Lie bialgebras on the one sided Witt algebra, the Witt algebra and the Virasoro algebra are investigated. As a result, we obtain some new infinite dimensional Lie algebras. This talk is based on a joint work with Yucai Su.

In many medical studies some markers, such as the medical costs incurred during each hospitalisation, are only measured when an event, such as a hospitalisation, occurs. In addition, there may exist an informative terminal event that stops the follow-up. In this article, we propose an additive-multiplicative mean model for marker data contingent on recurrent event with an informative terminal event via latent variables. Estimation procedures are developed for parameter estimation, and asymptotic properties of the proposed estimators are derived. In addition, some numerical procedures are provided for model checking. The finite sample properties of the proposed estimators are examined through simulation studies. An application to a medical cost study of chronic heart failure patients from the University of Virginia Health System is illustrated.

学术报告报告人：汪寿阳研究员（第三世界科学院院士,中科院数学与系统科学研究院）题目: 一个原油价格形成机制的理论与EMD的几个数学问题时间：2014年9月21日(星期日)下午4：30—5：30地点：数学系致远楼107欢迎各位参加

学术报告报告人:章梅荣(清华大学数学系)题目：非退化位势与非线性微分方程解集合的结构时间：2014年9月19日(星期五)上午9：00—10：00地点：致远楼102欢迎各位老师和参加

学术报告报告人:舒洪颖题目：Global dynamics on viral dynamics时间：2014年9月19日(星期五)上午10：00—11：00地点：致远楼102欢迎各位老师和学生参加

Gesture recognition allows users to communicate with the machines more naturally without any mechanical devices such as keyboards or mouse. It can be conducted with techniques fromcomputer visionandimage processing. Input devices include wired gloves, stereo cameras and controller-based gestures. Leap Motion Controller is a new device that is capable of tracking all ten of one’s fingers individually and handling movements with high speed and accuracy. This presentation will introduce gesture recognition algorithms, challenges and potential applications. Leap Motion Controller based hand gesture applications will be demonstrated.

Starting from two expressions of the famous Kostka polynomial, I explain how to generalize this equality in full generality for so called type A with the aid of the crystal basis theory and to prove it in a combinatorial manner. I then extend the equality, though it is still a conjecture (X=M conjecture), to all affine root systems. Finally, I give a sketch of proof for settled cases.