YAFFS(yet another flash file system)是至今惟一专门为NAND F lash设计的文件系统.在适应NANDF lash特点的同时,能更好地发挥NAND F lash的优点,使之达到最优的性能.YAFFS文件系统使用日志结构、错误检测和纠正提高了NAND F lash的健...YAFFS(yet another flash file system)是至今惟一专门为NAND F lash设计的文件系统.在适应NANDF lash特点的同时,能更好地发挥NAND F lash的优点,使之达到最优的性能.YAFFS文件系统使用日志结构、错误检测和纠正提高了NAND F lash的健壮性.因此,它的出现使得价格低廉的NAND闪存芯片具有了高效性和健壮性.YAFFS文件系统性能优越且易于移植,已经成功应用于L inux、uC linux和W indows CE等嵌入式操作系统.介绍了YAFFS文件系统向嵌入式L inux内核中的移植过程,并对移植的结果进行了测试.展开更多
The synonymous use of the general term ＂landslide＂, with a built-in reference to a sliding motion, for all varieties of mass-transport deposits （MTD）, which include slides, slumps, debrites, topples, creeps, debri...The synonymous use of the general term ＂landslide＂, with a built-in reference to a sliding motion, for all varieties of mass-transport deposits （MTD）, which include slides, slumps, debrites, topples, creeps, debris avalanches etc. in subaerial, sublacustrine, sub- marine, and extraterrestrial environments has created a multitude of conceptual and nomen- clatural problems. In addition, concepts of triggers and Iong-runout mechanisms of mass movements are loosely applied without rigor. These problems have enormous implications for studies in process sedimentology, sequence stratigraphy, palaeogeography, petroleum geol- ogy, and engineering geology. Therefore, the objective of this critical review is to identify key problems and to provide conceptual clarity and possible solutions. Specific issues are the fol- lowing： （1） According to ＂limit equilibrium analyses＂ in soil mechanics, sediment failure with a sliding motion is initiated over a shear surface when the factor of safety for slope stability （F） is less than 1. However, the term landslide is not meaningful for debris flows with a flowing mo- tion. （2） Sliding motion can be measured in oriented core and outcrop, but such measurement is not practical on seismic profiles or radar images. （3） Although 79 MTD types exist in the geological and engineering literature, only slides, slumps, and debrites are viable depositional facies for interpreting ancient stratigraphic records. （4） The use of the term landslide for high- velocity debris avalanches is inappropriate because velocities of mass-transport processes cannot be determined in the rock record. （5） Of the 21 potential triggering mechanisms of sediment failures, frequent short-term events that last for only a few minutes to several hours or days （e.g., earthquakes, meteorite impacts, tsunamis, tropical cyclones, etc.） are more relevant in controlling deposition of deep-water sands than sporadic long-term events that last for thousands to millions of years （e.g., sea-展开更多
文摘YAFFS(yet another flash file system)是至今惟一专门为NAND F lash设计的文件系统.在适应NANDF lash特点的同时,能更好地发挥NAND F lash的优点,使之达到最优的性能.YAFFS文件系统使用日志结构、错误检测和纠正提高了NAND F lash的健壮性.因此,它的出现使得价格低廉的NAND闪存芯片具有了高效性和健壮性.YAFFS文件系统性能优越且易于移植,已经成功应用于L inux、uC linux和W indows CE等嵌入式操作系统.介绍了YAFFS文件系统向嵌入式L inux内核中的移植过程,并对移植的结果进行了测试.
文摘The synonymous use of the general term ＂landslide＂, with a built-in reference to a sliding motion, for all varieties of mass-transport deposits （MTD）, which include slides, slumps, debrites, topples, creeps, debris avalanches etc. in subaerial, sublacustrine, sub- marine, and extraterrestrial environments has created a multitude of conceptual and nomen- clatural problems. In addition, concepts of triggers and Iong-runout mechanisms of mass movements are loosely applied without rigor. These problems have enormous implications for studies in process sedimentology, sequence stratigraphy, palaeogeography, petroleum geol- ogy, and engineering geology. Therefore, the objective of this critical review is to identify key problems and to provide conceptual clarity and possible solutions. Specific issues are the fol- lowing： （1） According to ＂limit equilibrium analyses＂ in soil mechanics, sediment failure with a sliding motion is initiated over a shear surface when the factor of safety for slope stability （F） is less than 1. However, the term landslide is not meaningful for debris flows with a flowing mo- tion. （2） Sliding motion can be measured in oriented core and outcrop, but such measurement is not practical on seismic profiles or radar images. （3） Although 79 MTD types exist in the geological and engineering literature, only slides, slumps, and debrites are viable depositional facies for interpreting ancient stratigraphic records. （4） The use of the term landslide for high- velocity debris avalanches is inappropriate because velocities of mass-transport processes cannot be determined in the rock record. （5） Of the 21 potential triggering mechanisms of sediment failures, frequent short-term events that last for only a few minutes to several hours or days （e.g., earthquakes, meteorite impacts, tsunamis, tropical cyclones, etc.） are more relevant in controlling deposition of deep-water sands than sporadic long-term events that last for thousands to millions of years （e.g., sea-
