城市园林绿化数字化建设标准研究初探

数字化建设是城市园林绿化建设的一大趋势,很多城市和地区已进行了相关探索,园林绿化数字化建设的标准成为当前园林绿化工作的当务之急。从城市园林绿化数字化建设的必要性入手,在分析域外和我国城市园林绿化数字化标准建设的基础上,提出城市园林绿化数字化建设标准体系构建要遵循系统性、先进性和全局性原则,初步构建了城市园林绿化数字化标准体系,探索性提出了城市园林绿化数字化标准主要内容,进而提出了加强城市园林绿化数字化标准建设的4条建议。     

基于安卓电视机芯智能升级的应用研究

对比了目前几种安卓电视智能升级方案,提出了一种在现有电视技术条件下,通过一个自定义接口完成安卓电视机芯智能升级的方案。该方法具有电视整机机芯升级简单、便捷、成本低、原有整机利用率高的优点。并以50个管脚的自定义接口为例,具体阐述了安卓电视机芯升级的软件、硬件解决方案。     

Operational specification with joint actions: Serializable databases

Summary Joint actions are introduced as a language basis for operational specification of reactive systems. Joint action systems are closed systems with no communication primitives. Their nondeterministic execution model is based on multi-party actions without an explicit control flow, and they are amenable for stepwise derivation by superposition. The approach is demonstrated by deriving a specification for serializable databases in simple derivation steps. Two different implementation strategies are imposed on this as further derivations. One of the strategies is two-phase locking, for which a separate implementation is given and proved correct. The other is multiversion timestamp ordering, for which the derivation itself is an implementation. Reino Kurki-Suonio received a Dr. Phil. degree from the University of Helsinki in 1964. At the University of Tampere he headed the first computer science department in Scandinavia since its creation in 1965. Currently he is professor of computer science and engineering at Tampere University of Technology. He has held visiting positions at Carnegie-Mellon and Stanford Universities. During the years his research interests have shifted from formal grammars, parsing methods, and programming languages to formal specification and design of distributed systems.     

Verification of a sliding window protocol in μCRL and PVS

We prove the correctness of a sliding window protocol with an arbitrary finite window size n and sequence numbers modulo 2n. The correctness consists of showing that the sliding window protocol is branching bisimilar to a queue of capacity 2n. The proof is given entirely on the basis of an axiomatic theory, and has been checked in the theorem prover PVS. Received November 2004 Revised June 2005 Accepted July 2005 by J. V. Tucker     

The development of an open-network digital circuit multiplication equipment system

This paper discusses the systematization effort undertaken to generate an equipment specification of an extremely detailed and new nature for DCMEs in accordance with the INTELSAT specification IESS-501. The main areas of importance addressed are additional to what has already been defined within the IESS-501. A discussion of important aspects when introducing DCME into actual network conditions is also contained and results based on simulations of performance under simulated network environments are included.     

Essential concepts of algebraic specification and program development

The main ideas underlying work on the model-theoretic foundations of algebraic specification and formal program development are presented in an informal way. An attempt is made to offer an overall view, rather than new results, and to focus on the basic motivation behind the technicalities presented elsewhere.     

The rely-guarantee method for verifying shared variable concurrent programs

Compositional proof systems for shared variable concurrent programs can be devised by including the interference information in the specifications. The formalism falls into a category calledrely-guarantee (orassumption-commitment), in which a specification is explicitly (syntactically) split into two corresponding parts. This paper summarises existing work on the rely-guarantee method and gives a systematic presentation. A proof system for partial correctness is given first, thereafter it is demonstrated how the relevant rules can be adapted to verify deadlock freedom and convergence. Soundness and completeness, of which the completeness proof is new, are studied with respect to an operational model. We observe that the rely-guarantee method is in a sense a reformulation of the classical non-compositional Owicki & Gries method, and we discuss throughout the paper the connection between these two methods.The research was partially supported by Esprit-BRA project 6021 (REACT).     

按API─9A规范生产石油用钢丝绳

对ＧＢ１１０２—７０《圆股钢丝绳》标准、ＧＢ８９１８—８８《优质钢丝绳》标准进行了分析，指出生产石油用钢丝绳应执行ＡＰＩ—９Ａ《钢丝绳规范》．     

电视机能源之星7.0版技术规范解读

美国环保署(EPA)发布了电视机能源之星7.0版产品技术规范,于2015年10月30日起正式生效实施.与6.0版相比,修订了多处内容,差异较大.该文从产品定义、范围和功耗要求等方面进行了解读.     

地下工程防水等级标准之我见──兼谈“国标”相关内容的不足

综述国内外地下工程和隧道的防水等级标准，并对我国现行标准有关内容进行评价。