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| 1 | On (2~m + 1)-variable symmetric Boolean functions with submaximum algebraic immunity 2^(m-1)显示文摘All (2m +1)-variable symmetric Boolean functions with submaximal algebraic immunity 2m-1 are described and constructed. The total number of such Boolean functions is 32 ·22m-3 +3m-2 · 24 - 2 for m≥2. | LIAO QunYing1, LIU Feng2 & FENG KeQin2 1 College of Mathematics and Software Sciences, Sichuan Normal University, Chengdu 610066, China 2 Department of Mathematical Sciences, Tsinghua University, Beijing 100084, China | 2009 | Science China Mathematics2009，52，1： | 4 |
| 2 | How to Implement Product Data Management显示文摘introduced are the main implementation contents and brought out is a cycle optimal PDMimplementation methodology by phases through studying requirements of enterprises’ datamanagement and summarizing the existing method. The implementation contents include documentsmanagement product structure and configuration management, product classification and codingmanagement, workflow management and software encapsulation. It divides the PDM implementationinto preparing, software selechon and training, implementation plan making, concrete implementingand evaluating. By the cycle of the last two pheses, the successful implementation of PDM can beobtained. This methodology has been used in the CIMS project of two companies and proved to bepractical. | Yin Xiangyang Tong Bingshu Teng DongXing(Department of Precision instrument and Mechanology, Tsinghua University, Beijing, 100084, P.R.China)Han Yongsheng(ERC of Industrial Management & Design, Institute of Software, Chinese Academy of Sciences, Beijing,100080) | 1999 | Computer Aided Drafting,Design and Manufacturing1999，9，2： | 0 |
| 3 | Multi-dimensional project management models for mega-construction companies and their applications显示文摘China is undertaking an increasing number of mega-infrastructure projects along with its rapid economic expansion.For participants in these projects,understand how to adapt the proper and efficient management strategies is critical.In this paper,we propose three distinct models for companies under various background and management requirements,based on sophisticated data analysis and model development.Moreover,we successfully committed these models with hydropower development projects and achieved a great progress in enhancing management efficiency. | LIN ZhengHang 1,2,QIANG MaoShan 1,2,TANG WenZhe 1,2,FAN QiXiang 3 &LIU Qiang 4 1 Institute of Project Management and Construction Technology,Tsinghua University,Beijing 100084,China 2 State Key Laboratory of Hydraulic and Engineering,Tsinghua University,Beijing 100084,China 3 China Three Gorges Corporation,Yichang 443002,China 4 School of Software,Tsinghua University,Beijing 100084,China | 2011 | Science China(Technological Sciences)2011，54，S1： | 1 |
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