近似串匹配技术在网络信息搜索、数字图书馆、模式识别、文本挖掘、IP路由查找、网络入侵检测、生物信息学、音乐研究计算等领域具有广泛的应用.基于CREW-PRAM(parallel random access machine with concurrent read and exclusive wri...近似串匹配技术在网络信息搜索、数字图书馆、模式识别、文本挖掘、IP路由查找、网络入侵检测、生物信息学、音乐研究计算等领域具有广泛的应用.基于CREW-PRAM(parallel random access machine with concurrent read and exclusive write)模型,采用波前式并行推进的方法直接计算编辑距离矩阵D,设计了一个允许k-差别的近似串匹配动态规划并行算法,该算法使用(m+1)个处理器,时间复杂度为O(n),算法理论上达到线性加速;采取水平和斜向双并行计算编辑距离矩阵D的方法,设计了一个使用a(m+1)个处理器和O(n/a+m)时间的、可伸缩的、允许k-差别的近似串匹配动态规划并行算法,+<11mna.基于分治策略,通过灵活拆分总线和合并子总线动态重构光总线系统,并充分利用光总线的消息播送技术和并行计算前缀和的方法,实现了汉明距离的并行计算,设计了两个基于LARPBS(linear arrays with reconfigurable pipelined bus system)模型的通信高效、可扩放的允许k-误配的近似串匹配并行算法,其中一个算法使用n个处理器,时间为O(m);另一个为常数时间算法,使用mn个处理器.展开更多
Proteins are a class of biomaterials having a vast array of functions, including the catalysis of metabolic reactions, DNA replication, stimuli response and transportation of molecules. Recent progress in laser-based...Proteins are a class of biomaterials having a vast array of functions, including the catalysis of metabolic reactions, DNA replication, stimuli response and transportation of molecules. Recent progress in laser-based fabrication technologies has enabled the formation of three-dimensional （3D） proteinaceous micro- and nano-structures by femtosecond laser cross-linking, which has expanded the possible applications of proteins. This article reviews the current knowledge andrecent advancements in the femtosecond laser cross-linking of proteins. An overview of previous studies related to fabri-cation using a variety of proteins and detailed discussions of the associated mechanisms are provided. In addition, ad-vances and applications utilizing specific protein functions are introduced. This review thus provides a valuable summaryof the 3D micro- and nano-fabrication of proteins for biological and medical applications.展开更多
Dear Editor,I am Dr.Cai-Xuan Huang,from the Eye Center,Renmin Hospital of Wuhan University,Hubei Province,China.I write to present a case report of bilateral anterior megalophthalmos with open-angle glaucoma,which was...Dear Editor,I am Dr.Cai-Xuan Huang,from the Eye Center,Renmin Hospital of Wuhan University,Hubei Province,China.I write to present a case report of bilateral anterior megalophthalmos with open-angle glaucoma,which was treated by combined phacoemulsification and anterior vitrectomy.展开更多
Dear Editor,I am Dr.Daniel Russell Richardson from the West Virginia University Eye Institute in Morgantown,West Virginia,United States.I write to present a case of uveitis associated with nivolumab,which is a promisi...Dear Editor,I am Dr.Daniel Russell Richardson from the West Virginia University Eye Institute in Morgantown,West Virginia,United States.I write to present a case of uveitis associated with nivolumab,which is a promising new immune checkpoint inhibitor（ICI）for metastatic melanoma and non-small cell lung carcinoma with expanding indications.As the use of nivolumab continues to increase,ophthalmologists must be aware of uveitis as an adverse event.展开更多
Key-value （KV） stores have become a backbone of large-scale applications in today＇s data centers. Write- optimized data structures like the Log-Structured Merge-tree （LSM-tree） and their variants are widely used ...Key-value （KV） stores have become a backbone of large-scale applications in today＇s data centers. Write- optimized data structures like the Log-Structured Merge-tree （LSM-tree） and their variants are widely used in KV storage systems like BigTable and RocksDB. Conventional LSM-tree organizes KV items into multiple, successively larger components, and uses compaction to push KV items from one smaller component to another adjacent larger component until the KV items reach the largest component. Unfortunately, current compaction scheme incurs significant write amplification due to repeated KV item reads and writes, and then results in poor throughput. We propose a new compaction scheme, delayed compaction （dCompaction） that decreases write amplification, dCompaction postpones some compactions and gathers them into the following compaction. In this way, it avoids KV item reads and writes during compaction, and consequently improves the throughput of LSM-tree based KV stores. We implement dCompaction on RocksDB, and conduct extensive experiments. Validation using YCSB framework shows that compared with RocksDB, dCompaction has about 40% write performance improvements and also comparable read performance.展开更多
"The heroic life is the sphere of danger,violence and the courting of risk whereas everyday life is the sphere of women,reproduction and care,"writes British sociologist Mike Featherstone in his 1971 paper T..."The heroic life is the sphere of danger,violence and the courting of risk whereas everyday life is the sphere of women,reproduction and care,"writes British sociologist Mike Featherstone in his 1971 paper The Heroic Life and Everyday Life.展开更多
Activity 1 Think about the following questions and write down your answers before reading the text.1.What cultural significance do seals hold in Chinese tradition?2.How can we promote seal art?
Activity 1 Think about the following questions and write down your answers before reading the text.1.In your opinion,how can good neighborhood relationships contribute to personal growth and development?2.How do you t...Activity 1 Think about the following questions and write down your answers before reading the text.1.In your opinion,how can good neighborhood relationships contribute to personal growth and development?2.How do you think technology and modern lifestyles have changed the nature of neighborhood bonds?展开更多
Activity 1.Think about the following questions and write down your answers before reading the text.1.What might future space exploration look like?2.How could technology change planetary traversal?
To mitigate the impact of noise and inter-ference on multi-level-cell(MLC)flash memory with the use of low-density parity-check(LDPC)codes,we propose a dynamic write-voltage design scheme con-sidering the asymmetric p...To mitigate the impact of noise and inter-ference on multi-level-cell(MLC)flash memory with the use of low-density parity-check(LDPC)codes,we propose a dynamic write-voltage design scheme con-sidering the asymmetric property of raw bit error rate(RBER),which can obtain the optimal write voltage by minimizing a cost function.In order to further improve the decoding performance of flash memory,we put forward a low-complexity entropy-based read-voltage optimization scheme,which derives the read voltages by searching for the optimal entropy value via a log-likelihood ratio(LLR)-aware cost function.Simulation results demonstrate the superiority of our proposed dynamic write-voltage design scheme and read-voltage optimization scheme with respect to the existing counterparts.展开更多
Note-taking is a skill that can help you do well in all your schoolwork.It can make you confident(自信的)when you are studying.1 If your teacher writes notes on the blackboard,that's great.You can copy them or wri...Note-taking is a skill that can help you do well in all your schoolwork.It can make you confident(自信的)when you are studying.1 If your teacher writes notes on the blackboard,that's great.You can copy them or write down the most important facts of all in class.2 For example,some teachers may focus on lots of dates and facts in class,but they only write the important ones on the blackboard.Other teachers may not write anything down,but they may repeat them.展开更多
Activity 1.Think about the following questions and write down your answers before reading the text.1.Do you know any traditional crafts?2.How can young people be encouraged to learn traditional crafts?
Activity 1.Think about the following questions and write down your answers before reading the text.1.If you were to introduce Sichuan Opera facechanging to people from other countries,what key points would you emphasi...Activity 1.Think about the following questions and write down your answers before reading the text.1.If you were to introduce Sichuan Opera facechanging to people from other countries,what key points would you emphasize?2.If you had the opportunity to learn the art of facechanging in Sichuan Opera,what difficulties do you think you might encounter?展开更多
文摘近似串匹配技术在网络信息搜索、数字图书馆、模式识别、文本挖掘、IP路由查找、网络入侵检测、生物信息学、音乐研究计算等领域具有广泛的应用.基于CREW-PRAM(parallel random access machine with concurrent read and exclusive write)模型,采用波前式并行推进的方法直接计算编辑距离矩阵D,设计了一个允许k-差别的近似串匹配动态规划并行算法,该算法使用(m+1)个处理器,时间复杂度为O(n),算法理论上达到线性加速;采取水平和斜向双并行计算编辑距离矩阵D的方法,设计了一个使用a(m+1)个处理器和O(n/a+m)时间的、可伸缩的、允许k-差别的近似串匹配动态规划并行算法,+<11mna.基于分治策略,通过灵活拆分总线和合并子总线动态重构光总线系统,并充分利用光总线的消息播送技术和并行计算前缀和的方法,实现了汉明距离的并行计算,设计了两个基于LARPBS(linear arrays with reconfigurable pipelined bus system)模型的通信高效、可扩放的允许k-误配的近似串匹配并行算法,其中一个算法使用n个处理器,时间为O(m);另一个为常数时间算法,使用mn个处理器.
文摘Proteins are a class of biomaterials having a vast array of functions, including the catalysis of metabolic reactions, DNA replication, stimuli response and transportation of molecules. Recent progress in laser-based fabrication technologies has enabled the formation of three-dimensional （3D） proteinaceous micro- and nano-structures by femtosecond laser cross-linking, which has expanded the possible applications of proteins. This article reviews the current knowledge andrecent advancements in the femtosecond laser cross-linking of proteins. An overview of previous studies related to fabri-cation using a variety of proteins and detailed discussions of the associated mechanisms are provided. In addition, ad-vances and applications utilizing specific protein functions are introduced. This review thus provides a valuable summaryof the 3D micro- and nano-fabrication of proteins for biological and medical applications.
基金Supported by the National Natural Science Foundation of China(No.81400420)
文摘Dear Editor,I am Dr.Cai-Xuan Huang,from the Eye Center,Renmin Hospital of Wuhan University,Hubei Province,China.I write to present a case report of bilateral anterior megalophthalmos with open-angle glaucoma,which was treated by combined phacoemulsification and anterior vitrectomy.
文摘Dear Editor,I am Dr.Daniel Russell Richardson from the West Virginia University Eye Institute in Morgantown,West Virginia,United States.I write to present a case of uveitis associated with nivolumab,which is a promising new immune checkpoint inhibitor（ICI）for metastatic melanoma and non-small cell lung carcinoma with expanding indications.As the use of nivolumab continues to increase,ophthalmologists must be aware of uveitis as an adverse event.
基金This work is supported by the National Key Research and Development Program of China under Grant No. 2016YFB1000202 and the National Natural Science Foundation of China under Grant Nos. 61303056 and 61379042.
文摘Key-value （KV） stores have become a backbone of large-scale applications in today＇s data centers. Write- optimized data structures like the Log-Structured Merge-tree （LSM-tree） and their variants are widely used in KV storage systems like BigTable and RocksDB. Conventional LSM-tree organizes KV items into multiple, successively larger components, and uses compaction to push KV items from one smaller component to another adjacent larger component until the KV items reach the largest component. Unfortunately, current compaction scheme incurs significant write amplification due to repeated KV item reads and writes, and then results in poor throughput. We propose a new compaction scheme, delayed compaction （dCompaction） that decreases write amplification, dCompaction postpones some compactions and gathers them into the following compaction. In this way, it avoids KV item reads and writes during compaction, and consequently improves the throughput of LSM-tree based KV stores. We implement dCompaction on RocksDB, and conduct extensive experiments. Validation using YCSB framework shows that compared with RocksDB, dCompaction has about 40% write performance improvements and also comparable read performance.
文摘"The heroic life is the sphere of danger,violence and the courting of risk whereas everyday life is the sphere of women,reproduction and care,"writes British sociologist Mike Featherstone in his 1971 paper The Heroic Life and Everyday Life.
文摘Activity 1 Think about the following questions and write down your answers before reading the text.1.What cultural significance do seals hold in Chinese tradition?2.How can we promote seal art?
文摘Activity 1 Think about the following questions and write down your answers before reading the text.1.In your opinion,how can good neighborhood relationships contribute to personal growth and development?2.How do you think technology and modern lifestyles have changed the nature of neighborhood bonds?
文摘Activity 1.Think about the following questions and write down your answers before reading the text.1.What might future space exploration look like?2.How could technology change planetary traversal?
基金supported in part by the NSF of China under Grants 62322106,62071131,U2001203,61871136the Guangdong Basic and Applied Basic Research Foundation under Grant 2022B1515020086+1 种基金the International Collaborative Research Program of Guangdong Science and Technology Department under Grant 2022A0505050070the Industrial R&D Project of Haoyang Electronic Co.,Ltd.under Grant 2022440002001494.
文摘To mitigate the impact of noise and inter-ference on multi-level-cell(MLC)flash memory with the use of low-density parity-check(LDPC)codes,we propose a dynamic write-voltage design scheme con-sidering the asymmetric property of raw bit error rate(RBER),which can obtain the optimal write voltage by minimizing a cost function.In order to further improve the decoding performance of flash memory,we put forward a low-complexity entropy-based read-voltage optimization scheme,which derives the read voltages by searching for the optimal entropy value via a log-likelihood ratio(LLR)-aware cost function.Simulation results demonstrate the superiority of our proposed dynamic write-voltage design scheme and read-voltage optimization scheme with respect to the existing counterparts.
文摘Note-taking is a skill that can help you do well in all your schoolwork.It can make you confident(自信的)when you are studying.1 If your teacher writes notes on the blackboard,that's great.You can copy them or write down the most important facts of all in class.2 For example,some teachers may focus on lots of dates and facts in class,but they only write the important ones on the blackboard.Other teachers may not write anything down,but they may repeat them.
文摘Activity 1.Think about the following questions and write down your answers before reading the text.1.Do you know any traditional crafts?2.How can young people be encouraged to learn traditional crafts?
文摘Activity 1.Think about the following questions and write down your answers before reading the text.1.If you were to introduce Sichuan Opera facechanging to people from other countries,what key points would you emphasize?2.If you had the opportunity to learn the art of facechanging in Sichuan Opera,what difficulties do you think you might encounter?
