A configurable type hierarchy index for OODB

With respect to the specific requirements of advanced OODB applications, index data structures for type hierarchies in OODBMS have to provide efficient support for multiattribute queries and have to allow index optimization for a particular query profile. We describe the multikey type index and an efficient implementation of this indexing scheme. It meets both requirements: in addition to its multiattribute query capabilities it is designed as a mediator between two standard design alternatives, key-grouping and type-grouping. A prerequisite for the multikey type index is a linearization algorithm which maps type hierarchies to linearly ordered attribute domains in such a way that each subhierarchy is represented by an interval of this domain. The algorithm extends previous results with respect to multiple inheritance. The subsequent evaluation of our proposal focuses on storage space overhead as well as on the number of disk I/O operations needed for query execution. The analytical results for the multikey type index are compared to previously published figures for well-known single-key search structures. The comparison clearly shows the superiority of the multikey type index for a large class of query profiles. Edited by E. Bertino. Received October 7, 1996 / Accepted March 28, 1997     

明孝陵禁约碑注译及景观诠释简

规划师、设计师和学者们在对在风景游览过程中规范人们行为的规章很感兴趣。在古代,明孝陵禁约碑的碑文中早已有对陵墓景观管理方面的相关条例。通过对其碑文的注译,探讨碑文的内在含义,研究其出现的时代背景,深入探讨中国文化对于中国人环境态度形成的影响,从而加深对于陵墓景观管理历史的学习,讨论其对于当今文化遗产景观保护与管理指导意义。     

当代艺术手法对楚文化的追“艺”溯源--武汉国际博览中心大型公共艺术品《楚红》

传统文化归属感和现代元素的时代感是当代环境艺术设计中的两大主旋律。本案例基于武汉国际博览中心入口大堂主墙面景观装饰,在设计上融合楚文化精髓,吐故纳新,以地域特色为基准,以期提升武汉国际博览中心的地位。     

回族风格地域建筑创作探析

随着经济社会的发展,回族同胞开始文化觉醒,他们对能够代表新时代回族文化的建筑有着迫切的需求。本文从分析回族传统建筑文化、回族传统建筑特点入手,探析了回族文化的精神内涵如何在回族地域建筑创作中传承。     

解析中国民间图案色彩的传承

通过总结中国民间图案色彩独特鲜明的特点,以艺术生态观去解剖民间色彩并阐述了古为今用原则作为艺术创新指南的重要性,在此基础上以论证形式讨论了传统是文化的基础与民间色彩的"源"和"流"的关系。进而得出结论,尊重传统,光大基础,传承精华,在全球化的过程中,中华民族文化与艺术,需要得到继承和发展,民族的才是世界的。     

徽色空间在宣城供电公司办公楼中的体现

由宣城供电公司电力调度综合楼方案设计引发的徽色空间的建筑体验,对传统徽派建筑中的共享空间如何运用到现代办公楼作出了合理的解释。从形式上的元素处理,到空间上的传承表达,以及对于现代办公楼建筑的影响作为出发点,引发出＂空间的共享,时间的延续＂。     

Transgenerationally Transmitted DNA Demethylation of a Spontaneous Epialleles Using CRISPR/dCas9-TET1cd Targeted Epigenetic Editing in Arabidopsis

CRISPR/dCas9 is an important DNA modification tool in which a disarmed Cas9 protein with no nuclease activity is fused with a specific DNA modifying enzyme. A previous study reported that overexpression of the TET1 catalytic domain (TET1cd) reduces genome-wide methylation in Arabidopsis. A spontaneous naturally occurring methylation region (NMR19-4) was identified in the promoter region of the PPH (Pheophytin Pheophorbide Hydrolase) gene, which encodes an enzyme that can degrade chlorophyll and accelerate leaf senescence. The methylation status of NMR19-4 is associated with PPH expression and leaf senescence in Arabidopsis natural accessions. In this study, we show that the CRISPR/dCas9-TET1cd system can be used to target the methylation of hypermethylated NMR19-4 region to reduce the level of methylation, thereby increasing the expression of PPH and accelerating leaf senescence. Furthermore, hybridization between transgenic demethylated plants and hypermethylated ecotypes showed that the demethylation status of edited NMR19-4, along with the enhanced PPH expression and accelerated leaf senescence, showed Mendelian inheritance in F1 and F2 progeny, indicating that spontaneous epialleles are stably transmitted trans-generationally after demethylation editing. Our results provide a rational approach for future editing of spontaneously mutated epialleles and provide insights into the epigenetic mechanisms that control plant leaf senescence.     

基于I-RBAC的CIMS集成访问控制

CIMS面临复杂的数据资源的安全管理难题,传统的访问控制一般分散在网络操作系统、数据库管理系统、应用系统中,没有一个统一的安全控制策略。为此,在目前RBAC模型的基础上,提出了集成角色访问控制模型,并从静态和动态两方面研究了模型的内容和规则,给出了模型实现的体系结构,分析了角色的安全性。该模型已应用于某烟草集团CIMS建设中,使访问控制更好地适应了企业特定的安全策略。     

“湘南木雕”传统工艺与创新研究

木雕,是从传统民间工艺——木工中衍生出来的一个精细工种。木雕在原始社会新石器时期的浙江河姆渡文化中便已初现雏形,那时候的木材被削尖用来做防御武器,抵御外敌入侵,同时也因通信技术的不发达,原始人类在木头上雕刻做简单的记号;这从考古学家挖掘的木雕人面像中可初见端倪,可以说木雕在物质条件落后的原始社会是不可或缺的。随着现代社会科学技术日新月异的发展,人们不再需要木器来自卫和维持基本的物质生活,木雕作为精神文化的一个依托似乎慢慢地淡出了人们的视野。     

陕西省体育非物质文化遗产保护现状与对策探析——以红拳为例

随着时代发展与文化变迁,我国民族传统体育非物质文化遗产的生存面临巨大挑战.陕西省非物质文化遗产在中华民族文化宝库中占有重要地位.运用访谈法、文献资料法、田野调查法等,对陕西省体育非物质文化遗产的保护传承问题进行了探究.阐述了陕西省体育非物质文化遗产（红拳）的价值特征;提出了陕西省民族传统体育非物质文化遗产保护传承的策略.