The Timed RAISE Specification Language (Timed RSL) is an extension of RAISE Specification Language by adding time constructors for specifying real-time applications. Duration Calculus (DC) is a real-time interval log...The Timed RAISE Specification Language (Timed RSL) is an extension of RAISE Specification Language by adding time constructors for specifying real-time applications. Duration Calculus (DC) is a real-time interval logic, which can be used to specify and reason about timing and logical constraints on dura- tion properties of Boolean states in a dynamic system. This paper gives a denotational semantics to a subset of Timed RSL expressions, using Duration Calculus extended with super-dense chop modality and notations to capture time point properties of piecewise continuous states of arbitrary types. Using this semantics, the paper presents a proof rule for verifying Timed RSL iterative expressions and implements the rule to prove the satisfaction by a sample Timed RSL specification of its real-time requirements.展开更多
One kind of tensor denotation of nth Beltrami axisymmetric and nonaxisymmetric spherical vortices, their classification and symmetries were discussed. Chaotic Phenomena will occur in the dynamic system of the nonaxisy...One kind of tensor denotation of nth Beltrami axisymmetric and nonaxisymmetric spherical vortices, their classification and symmetries were discussed. Chaotic Phenomena will occur in the dynamic system of the nonaxisymmetric Beltrami spherical vortices. From these aspects, it is shown that the tensor denotation has more meaningful characters and nonaxisymmetric Beltrami shperical vortices are various and very complex.展开更多
This paper first points out the deficiency of listing synonyms by some dictionaries,such as the Cobuild Dictionary and Merriam-Webster’s Dictionary of Synonyms,which,however,have actually failed in distinguishing bet...This paper first points out the deficiency of listing synonyms by some dictionaries,such as the Cobuild Dictionary and Merriam-Webster’s Dictionary of Synonyms,which,however,have actually failed in distinguishing between some synonyms.Then,the paper attempts to solve the problem by providing a brief review of relevant studies in the past few decades on near synonyms with a focus on differences in denotation,connotation and semantic prosody of words as well as various definitions of semantic prosody and related researches.By evaluating the relevant research and defintions of semantic prosody,the review concluded that the alleged dictionaries would be perfected with the provision of connotations or semantic prosodies for near synonyms before suggesting out the focus of future and further research into near synonyms.展开更多
This paper deals with thematization as a fundamental step towards the determination of photography image discourses in order to index them. It deals with questions related to photographic reality, polysemy, denotation...This paper deals with thematization as a fundamental step towards the determination of photography image discourses in order to index them. It deals with questions related to photographic reality, polysemy, denotation and connotation, whose comprehension is fundamentally important for the interpretation of photography discourses. It also approaches aspects that have influenced photography analysis towards its thematization, such as the characterization of an image bank, the functions performed by photos, as well as technical and visual quality.展开更多
In course of a direct calculation we demonstrate the activity of parameters of the Lorentz transformation entering the original electric and magnetic field vectors E and H. The validity of the transformation is shown ...In course of a direct calculation we demonstrate the activity of parameters of the Lorentz transformation entering the original electric and magnetic field vectors E and H. The validity of the transformation is shown with the aid of the relation E <sup>2</sup>- H<sup>2</sup> = E'<sup>2</sup>- H'<sup>2 </sup>which holds for any suitable pair of the vectors E, H and E', H'. No special geometry of the vector pairs entering (E, H) and (E ', H') is assumed. The only limit applied in the paper concerns the velocity ratio betweeen v and c which should be smaller than unity.展开更多
Semantics,the study of meaning,is closely connected with translation,the practice of transferring meaning.The paper uses a lot of examples based on real translation practice to prove that semantics plays a very import...Semantics,the study of meaning,is closely connected with translation,the practice of transferring meaning.The paper uses a lot of examples based on real translation practice to prove that semantics plays a very important role in translation practice.Understanding and making good use of semantic relations,including synonymy,polysemy,homonymy and antonymy,are quite important for a translator to deal with some complicated semantic problems in translation practice.The paper also discusses the concept of denotative and connotative meanings,two basic types of meaning in Semantics.Denotation means the literal meaning of a word which is given in dictionaries;and connotation,the associative and suggestive meanings of a word in its context.Be cause of cultural difference,words with the same denotations may have totally different connotations,which is why the concept of denotation and connotation plays a very important role in English/Chinese translation.In order to translate a text into another language correctly,translator must totally understand the meaning of the original word,both denotative and connotative mean ing,and be aware of the potential connotations of the word in the target language.展开更多
Through analyzing the paradigmatic and syntagmatic relations and exploring the case study of"red"and"black"in thedifferent culture backgrounds, the problems in the comprehension are put forward for...Through analyzing the paradigmatic and syntagmatic relations and exploring the case study of"red"and"black"in thedifferent culture backgrounds, the problems in the comprehension are put forward for the purpose of enhancing the learners' abilityof words comprehension based on a complex meaning system.展开更多
In the design of dependable software for embed- ded and real-time operating systems, time analysis is a cru- cial but extremely difficult issue, the challenge of which is exacerbated due to the randomness and nondeter...In the design of dependable software for embed- ded and real-time operating systems, time analysis is a cru- cial but extremely difficult issue, the challenge of which is exacerbated due to the randomness and nondeterminism of interrupt handling behaviors. Thus research into a theory that integrates interrupt behaviors and time analysis seems to be important and challenging. In this paper, we present a pro- gramming language to describe programs with interrupts that is comprised of two essential parts: main program and inter- rupt handling programs. We also explore a timed operational semantics and a denotational semantics to specify the mean- ings of our language. Furthermore, a strategy of deriving de- notational semantics from the timed operational semantics is provided to demonstrate the soundness of our operational se- mantics by showing the consistency between the derived de- notational semantics and the original denotational semantics.展开更多
The Orc language is a concurrency calculus pro- posed to study the orchestration patterns in service oriented computing. Its special features, such as high concurrency and asynchronism make it a brilliant subject for ...The Orc language is a concurrency calculus pro- posed to study the orchestration patterns in service oriented computing. Its special features, such as high concurrency and asynchronism make it a brilliant subject for studying web applications that rely on web services. The conventional se- mantics for Orc does not contain the execution status of ser- vices so that a program cannot determine whether a service has terminated normally or halted with a failure after it pub- lished some results. It means that this kind of failure cannot be captured by the fault handler. Furthermore, such a seman- tic model cannot establish an order saying that a program is better if it fails less often. This paper employs UTP methods to propose a denotational semantic model for Orc that con- rains execution status information. A failure handling seman- tics is defined to recover a failure execution back to normal. A refinement order is defined to compare two systems based on their execution failures. Based on this order, a system that introduces a failure recovery mechanism is considered bet- ter than one without. An extended operational semantics is also proposed and proven to be equivalent to the denotational semantics.展开更多
Finite Chu spaces are proposed for the modeling and verification of concurrent programs.In order to model not only typical concurrent behaviors but also modern exception handling and synchronization mechanisms,we desi...Finite Chu spaces are proposed for the modeling and verification of concurrent programs.In order to model not only typical concurrent behaviors but also modern exception handling and synchronization mechanisms,we design an enriched process algebra of Chu spaces from a practical point of view.To illustrate the power of finite Chu spaces and the process algebra while abstracting away from language-specific details,an imaginary concurrent programming language(ICL) is designed.A denotational semantics of ICL is presented using finite Chu spaces and the enriched process algebra.The valuation functions are fairly straightforward since the carefully designed operators have done much of the job.The enriched process algebra is also used as the specification language for Chu spaces,with which process-algebraic properties can be specified.Verification algorithms are presented with their time complexities discussed.展开更多
As one of the most promising propulsion systems in the future,shock-induced combustion ramjet engine can remedy the disadvantages in the integrated design of scramjet engine and airframe.It can shorten the length of t...As one of the most promising propulsion systems in the future,shock-induced combustion ramjet engine can remedy the disadvantages in the integrated design of scramjet engine and airframe.It can shorten the length of the combustor,lighten the structure weight of the engine and keep better performance in a broad range of flight Mach number.The elementary principle of shock-induced combustion ramjet engine is introduced.The key technologies of this kind of propulsion system are described,while their research status is presented in detail.Suggestion on the development of shcramjet engine in China is put forward.展开更多
基金This work is partially supported by the National Natural Science Foundation of China (No. 69773025).
文摘The Timed RAISE Specification Language (Timed RSL) is an extension of RAISE Specification Language by adding time constructors for specifying real-time applications. Duration Calculus (DC) is a real-time interval logic, which can be used to specify and reason about timing and logical constraints on dura- tion properties of Boolean states in a dynamic system. This paper gives a denotational semantics to a subset of Timed RSL expressions, using Duration Calculus extended with super-dense chop modality and notations to capture time point properties of piecewise continuous states of arbitrary types. Using this semantics, the paper presents a proof rule for verifying Timed RSL iterative expressions and implements the rule to prove the satisfaction by a sample Timed RSL specification of its real-time requirements.
文摘One kind of tensor denotation of nth Beltrami axisymmetric and nonaxisymmetric spherical vortices, their classification and symmetries were discussed. Chaotic Phenomena will occur in the dynamic system of the nonaxisymmetric Beltrami spherical vortices. From these aspects, it is shown that the tensor denotation has more meaningful characters and nonaxisymmetric Beltrami shperical vortices are various and very complex.
文摘This paper first points out the deficiency of listing synonyms by some dictionaries,such as the Cobuild Dictionary and Merriam-Webster’s Dictionary of Synonyms,which,however,have actually failed in distinguishing between some synonyms.Then,the paper attempts to solve the problem by providing a brief review of relevant studies in the past few decades on near synonyms with a focus on differences in denotation,connotation and semantic prosody of words as well as various definitions of semantic prosody and related researches.By evaluating the relevant research and defintions of semantic prosody,the review concluded that the alleged dictionaries would be perfected with the provision of connotations or semantic prosodies for near synonyms before suggesting out the focus of future and further research into near synonyms.
文摘This paper deals with thematization as a fundamental step towards the determination of photography image discourses in order to index them. It deals with questions related to photographic reality, polysemy, denotation and connotation, whose comprehension is fundamentally important for the interpretation of photography discourses. It also approaches aspects that have influenced photography analysis towards its thematization, such as the characterization of an image bank, the functions performed by photos, as well as technical and visual quality.
文摘In course of a direct calculation we demonstrate the activity of parameters of the Lorentz transformation entering the original electric and magnetic field vectors E and H. The validity of the transformation is shown with the aid of the relation E <sup>2</sup>- H<sup>2</sup> = E'<sup>2</sup>- H'<sup>2 </sup>which holds for any suitable pair of the vectors E, H and E', H'. No special geometry of the vector pairs entering (E, H) and (E ', H') is assumed. The only limit applied in the paper concerns the velocity ratio betweeen v and c which should be smaller than unity.
文摘Semantics,the study of meaning,is closely connected with translation,the practice of transferring meaning.The paper uses a lot of examples based on real translation practice to prove that semantics plays a very important role in translation practice.Understanding and making good use of semantic relations,including synonymy,polysemy,homonymy and antonymy,are quite important for a translator to deal with some complicated semantic problems in translation practice.The paper also discusses the concept of denotative and connotative meanings,two basic types of meaning in Semantics.Denotation means the literal meaning of a word which is given in dictionaries;and connotation,the associative and suggestive meanings of a word in its context.Be cause of cultural difference,words with the same denotations may have totally different connotations,which is why the concept of denotation and connotation plays a very important role in English/Chinese translation.In order to translate a text into another language correctly,translator must totally understand the meaning of the original word,both denotative and connotative mean ing,and be aware of the potential connotations of the word in the target language.
文摘Through analyzing the paradigmatic and syntagmatic relations and exploring the case study of"red"and"black"in thedifferent culture backgrounds, the problems in the comprehension are put forward for the purpose of enhancing the learners' abilityof words comprehension based on a complex meaning system.
文摘In the design of dependable software for embed- ded and real-time operating systems, time analysis is a cru- cial but extremely difficult issue, the challenge of which is exacerbated due to the randomness and nondeterminism of interrupt handling behaviors. Thus research into a theory that integrates interrupt behaviors and time analysis seems to be important and challenging. In this paper, we present a pro- gramming language to describe programs with interrupts that is comprised of two essential parts: main program and inter- rupt handling programs. We also explore a timed operational semantics and a denotational semantics to specify the mean- ings of our language. Furthermore, a strategy of deriving de- notational semantics from the timed operational semantics is provided to demonstrate the soundness of our operational se- mantics by showing the consistency between the derived de- notational semantics and the original denotational semantics.
基金This work was supported by the National High Tech- nology Research and Development Program of China (2012AA011205), the National Natural Science Foundation of China (Grant Nos. 61361136002, 61321064 and 91118007), Shanghai Knowledge Service Platform Project (ZF1213) and Shanghai Minhang Talent Project.
文摘The Orc language is a concurrency calculus pro- posed to study the orchestration patterns in service oriented computing. Its special features, such as high concurrency and asynchronism make it a brilliant subject for studying web applications that rely on web services. The conventional se- mantics for Orc does not contain the execution status of ser- vices so that a program cannot determine whether a service has terminated normally or halted with a failure after it pub- lished some results. It means that this kind of failure cannot be captured by the fault handler. Furthermore, such a seman- tic model cannot establish an order saying that a program is better if it fails less often. This paper employs UTP methods to propose a denotational semantic model for Orc that con- rains execution status information. A failure handling seman- tics is defined to recover a failure execution back to normal. A refinement order is defined to compare two systems based on their execution failures. Based on this order, a system that introduces a failure recovery mechanism is considered bet- ter than one without. An extended operational semantics is also proposed and proven to be equivalent to the denotational semantics.
基金supported by the National High-Tech Research and Development 863 Program of China under Grant No.2009AA01Z143the Research Foundation of the Ministry of Railways and Tsinghua University under Grant No.J2008X009
文摘Finite Chu spaces are proposed for the modeling and verification of concurrent programs.In order to model not only typical concurrent behaviors but also modern exception handling and synchronization mechanisms,we design an enriched process algebra of Chu spaces from a practical point of view.To illustrate the power of finite Chu spaces and the process algebra while abstracting away from language-specific details,an imaginary concurrent programming language(ICL) is designed.A denotational semantics of ICL is presented using finite Chu spaces and the enriched process algebra.The valuation functions are fairly straightforward since the carefully designed operators have done much of the job.The enriched process algebra is also used as the specification language for Chu spaces,with which process-algebraic properties can be specified.Verification algorithms are presented with their time complexities discussed.
基金supported by the National Natural Science Foundation of China (Grant No.90816016)the Excellent Student Innovative Project of National University of Defense Technology (Grant No.B070101)the Hunan Provincial Innovation Foundation for Postgraduate (Grant No.3206)
文摘As one of the most promising propulsion systems in the future,shock-induced combustion ramjet engine can remedy the disadvantages in the integrated design of scramjet engine and airframe.It can shorten the length of the combustor,lighten the structure weight of the engine and keep better performance in a broad range of flight Mach number.The elementary principle of shock-induced combustion ramjet engine is introduced.The key technologies of this kind of propulsion system are described,while their research status is presented in detail.Suggestion on the development of shcramjet engine in China is put forward.