An MAS Framework for Speculative Trading Research in Stock Index Futures Market

In this paper, we develop a futures trading simulation system to determine how speculative behavior affects the futures mar ket. A eonfigurable client is designed to simulate traders, and users can define trade strategies using different programming languages. A lightweight server is designed to handle large scale and highly eoncmTent access requests from clients. HBase is chosen as the database to grantee sealability of the system. As HBase only supports single row transaction, a transaction support mechanism is developed to improve data consistency for HBase. The HBase transaction support mecha nism supports multirow and multitaMe by using two phase commit protocol. The experiments indicate that our system shows high efficiency in the face of the large scale and high concurrency access request, and the read/write performance loss of HBase introduced by the transaction support mecha nisms is also acceptable.

华南地壳结构与构造边界特征:来自地震背景噪声和重力联合成像模型的约束

查明华南板块的地壳精细结构,厘清不同块体的地壳物质属性和构造边界特征,对研究华南成矿带的深部动力学成因以及华南板块的形成演化具有重要意义.随着新方法的发展和对多类型数据的深入挖掘,对壳内精细结构的分辨率逐渐提高,有鉴于此,本研究通过收集华南地区地震台站的波形数据,利用背景噪声面波和布格重力异常联合反演华南板块的地壳S波速度结构.结果表明:联合反演模型获取的布格重力异常与观测重力值拟合较好,印证了新方法的可靠性;上地壳内主要沉积盆地呈现明显的低速特征,地壳厚度由西到东呈现减薄的趋势,且在中地壳内,江南造山带南段的地壳结构呈现北东向的高低速带状穿插分布,在南北重力梯度带和江山-绍兴-萍乡-永州一线存在“蘑菇云”形状的中地壳隆升;随着深度的增加,在21~30 km下地壳,速度的横向变化不再与地壳浅层主要构造相对应,整个区域的速度分布呈现东高西低的趋势,且随着深度的增加这一特征越发明显;在30~40 km深度上,速度变化的东西分界与南北的布格重力异常梯度带近似重合.据此推测,江南造山带与扬子和华夏地块的构造边界分别沿着九江-常德-吉首-铜仁-百色一线和江山-绍兴-萍乡-永州-柳州-钦州一线;区域构造演化的动力学模型显示,扬子地块不断地为江南造山带西翼的北西向逆冲推覆提供驱动力,联合反演获取的地壳结构模型为探讨印支、扬子和华夏地块碰撞拼合的深部动力学过程以及区域成矿作用提供了重要约束.