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| 1 | 超级计算机设计的折衷考虑与CEDAR系统显示文摘一、引言计算机设计人员常常必须在所期望获得的体系结构特点与实际用来制造一个系统的硬件之间进行折衷。在超级计算机的设计中,由于希望获得高速度,而这样又容易加大成本,因而这些折衷就更加重要了。今天,设计人员在以每秒1亿多次算术运算的峰值速度执行的系统上工作,用户费用高达1千多万美元。需要超级计算机设计人员另外考虑的是,在过去,超级计算机为多数用户提供的性能只是其峰值性能的一小部分(例如5%~10%)。通过大量计算获得高效率是当今超级计算机系统还未达到的一个目标。在八十年代初的五年中,由于种种限制,人们纷纷转向多处理机超级计算机的研制。单处理机超级计算机具有专门的向量指令,它可利用在科学计算中出现的大量向量数据。这些处理机依赖流水算术运算。 | E.Davidson D.Kuck D.Lawrie A.Sameh 常春喜 | 1989 | 计算机工程与科学1989，11，2： | 0 |
| 2 | Recent Developments in Benzoannelated Triquinacenes and Fenestranes显示文摘1 Results Introduction of functional groups at the frameworks of the centropolyindanes is a non-trivial task since the construction of the rigid and massive skeletons of,e.g.,tribenzotriquinacene and fenestrindane requires well-balanced synthesis strategies[1,2].In the present contribution,some selected examples are presented for the recent multiple functionalization of tribenzotriquinacenes,such as compound 1,and fenestrindanes,such as compound 2,preformed in our laboratory.See Fig.1. | D.Kuck J.Strübe J.Linke | 2007 | 复旦学报(自然科学版)2007，46，5： | 0 |
| 3 | Orthogonally Oriented Functionalities Stretched into the Three-Space:the Centropolyindanes and Their Derivatives显示文摘1 Results The centropolyindanes represent a family of novel polycyclic aromatic hydrocarbons that are characterized by particularly rigid,three-dimensional frameworks.Mutual fusion of up to six indane units about a common neopentane core gives rise to various closely related,prototypical molecular scaffolds of high symmetry,and the indane units stretching out into the 3-space along the axes of the Cartesian coordinate system[1-2].Among the parent centropolyindanes,tribenzotriquinacene 1 is chemically mo... | D.Kuck | 2007 | 复旦学报(自然科学版)2007，46，5： | 0 |
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