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1.
The subliminal channel is used to send a secret message to an authorized receiver; the message cannot he discovered by any unauthorized receivers. Designated verifier signature (DVS) provide authentication of a message, we design a DVS scheme with message recovery mechanism and use it as a subliminal channel. In order to share a message among n users securely and allows t or more users can reconstruct the secret in dynamic groups, we combine both subliminal channel and (t, n) threshold cryptography. Then we proposed a threshold subliminal channel which can convey a subliminal message to a group of users based on message-recovery designated verifier signatures. Reconstructing the subliminal message relies on the cooperation of t or more users in the group and they can verify the validity of the subliminal message. Security and performance analysis show that the proposed scheme is secure and efficient.  相似文献   

2.
A proxy signature scheme with message recovery using self-certified public key is proposed, which withstands public key substitution attacks, active attacks, and forgery attacks. The proposed scheme accomplishes the tasks of public key verification, proxy signature verification, and message recovery in a logically single step. In addition, the proposed scheme satisfies all properties of strong proxy signature and does not use secure channel in the communication between the original signer and the proxy signature signer.  相似文献   

3.
周君 《科技信息》2009,(2):136-137
Idioms translation is of special importance both in English and Chinese languages.It is necessary to understand its implied meaning.This paper has made a summary of idioms translation techniques employed by the Yangs in The scholars,laying emphasis on the relationship between Functional Equivalence and idioms translation.Introducing six ways of idioms translation in The Scholars,the author explores the common ground between Yang Xianyi and Nida's translating ideas--the translation should consider both the readers and translators,be faith-ful to the original point of view and so on.  相似文献   

4.
The plasma transport between the plasmasphere and the ionosphere in response to the interplanetary conditions is still not fully understood until now.Simultaneous observations of the plasmasphere and ionosphere from the newly developed Chinese Meridian Project provide a new opportunity for understanding the characteristic of the plasma transport and the coupling mechanism between these two regions.We investigate the response of the plasmasphere(L≈2)and ionosphere to the solar wind dynamic pressure pulse during geomagnetically quiet period of 21–27 March 2011.The response of the plasmasphere shows a significant depletion.The plasmaspheric density nearly decreases by half in response to the solar wind dynamic pressure pulse,and subsequently recovers to the original level in 1–2 d.Meanwhile,the maximum electron density of the ionospheric F2 layer(NmF2)and the total electron content(TEC)increase by 13%and 21%,respectively,and then gradually recover,which is opposite to the behavior during magnetic storms.Preliminary analysis shows that the plasmaspheric depletion may be mainly caused by the southward interplanetary magnetic field and changing dawn-dusk electric field.The plasmaspheric density variations seem to be controlled by both the IMF and ionospheric conditions.  相似文献   

5.
MAC protocol of ControlNet uses Virtual Token Passing (VTP) to solve the medium access contention, to assure the deterministic and repeatability of message transmission. This paper presents the basic method that VTP uses to transmit real-time I/O message, explicit message and maintenance message in scheduled part, unscheduled part and guardband part respectively. On the basis of analyzing the factors of message transmission delay, the maximum message transmission delay in scheduled part is studied, and the result shows it can be determined, so the deterministic and repeatability of message transmission in ControlNet is validated.  相似文献   

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7.
朱禹驰 《科技信息》2009,(33):I0171-I0172
This paper focuses on the relationship between culture and translation research which aim of communication activity cross culture , and the effect of cultural difference to words translation. The focus is not only on theory, but also studies used as illustration. First, this paper analyses the development and effect of Nida's translation theories. It is then analyzed the problems in words translation caused by cultural differences and the methods which can be used to solve these problems. At last, this paper also prospects the effect produced by translation research which under the condition of cultural research to the world.  相似文献   

8.
黄晶晶 《科技信息》2012,(6):210-211
Aristotle is the greatest scholar of ancient Greece, his Poetics is considered as a classic theoretical work in the history of westernliterature, which mainly refers to the theory of tragedy. The paper aims at analyzing Eugene O’Neill’s Desire Under the Elms by applyingAristotle’s Tragedy Theory in order to acquire a sharp and deep understanding of literature and art.  相似文献   

9.
Hot solution of hydroquinone is oxidized by air forming quinone and quinhydrone, both of which have weak oxidizeability, enabling to oxidize metals on the surface of bronze mirror samples forming black and brilliant patina. SEM and electron micro probe analysis show that Cu content is lower than that of the original alloy due to Cu loss; Sn content is higher than the original alloy in patina. This indicates that humic acid is not the substance resulting in making black patina on the bronze mirror surface, but the black patina which produced from hydroquinone solution absence of Si, Al and Mg.  相似文献   

10.
Aiming at the problems of unreliable data transmission , poor steadiness , nonsupport of complex data types , direct couple between data transmission and exchange , a high-level method based on ad-vanced message queuing protocol ( AMQP) is proposed to integrate naval distributed tactical training simulation system after serious consideration with current information exchange features of military combat system .Transferring layer in traditional user datagram protocol is implemented by publishing and subscribing scheme of message middleware .By creating message model to standardize message structure , integration architecture is formulated to resolve potential information security risks from in-consistent data type and express data transmission .Meanwhile , a communication model is put for-ward based on AMQP , which is in the center position of the whole transmission framework and re-sponsible for reliably transferring battlefield data among subsystems .Experiments show that the method can accurately post amounts of data to the subscriber without error and loss , and can get ex-cellent real-time performance of data exchange .  相似文献   

11.
An understanding of the book of Genesis and its message is essential to the study of the Bible from which we know how the world and human beings come into existence in the ancient Hebrews'eyes.The greater part of the book Genesis is about four men's stories─ Abraham,Issac,Jacob,and Joseph.In this paper,Abraham's remarkable personalities will be examined thoroughly through taking some stories which are mainly included in Genesis12-25.  相似文献   

12.
Toll-like receptors (TLRs) and NK cell receptors are the most important receptor superfamilies in innate immunity. TLRs act as the sensor of external pathogens, while NK cells detect alterations in endogenous protein expression on target cells through activating and inhibitory receptors. Accumulating data has demonstrated that TLRs and NK cell receptors can coordinate and regulate each other during immune responses, which contributes to the initiation of innate response and the priming of adaptive responses. TLRs can activate NK cell function directly or with the help of accessory cells in a cytokine or cell-to-cell contact dependent manner. More understanding of the recognition of innate receptors and interactions between them may provide important insights into the design of effective strategies to combat tumor and microbial infections. In this review, we summarize how TLRs and NK cells discriminate the self or non-self components respectively. And importantly, we pay more attention to the role of TLR sig-naling in induction of NK cell activation, responses and the crosstalk between them.  相似文献   

13.
A peat core with depths of 297 cm was obtained from the Dajiuhu Basin(31°29′27″N,109°59′45″E,1760 m)in Hubei Province,Central China.10 AMS ages provide a time control and reveal that this core spans the past about 16.0 kaBP(calibrated age)(1 4C age:13.3 kaBP).Multi-proxy indexes analysis of geochemistry shows the following character of climate and environmental changes since about 16 kaBP:(1) The climate during the late-glacial period was cold and wet as a whole,but fluctuated continually.11.4- 12.6 cal.kaBP,12.6-15.2 cal.kaBP and 15.2-16 kaBP were corresponding respectively to the Younger Drays,Bφlling-Allerφd Warm Period and the Oldest Drays.(2)Inheriting the some climate characteristics of the late-glacial,the climate during the early-Holocene was wet and temperature increased gradually,during which an obvious dry event around 10.6 cal.kaB appeared.(3)The climate during the mid-Holocene was genarally warm and wet.During 9.2-7.5 kaBP,temperature increased gradually, precipitation was less comparatively and the 8.2 kaBP cold event which might be representative in the globe was reflected markedly.Then,multi-proxy records were relatively stable during 6.7-4.2 kaBP, which shows the best water and thermal condition in the Holocene Optimum.(4)Around 4.2 kaBP,the climate and environment transform from warm and wet to cool and dry,which may result in the collapse of the Neolithic Culture and midwifery the civilization of Xia Dynasty in this region.After 0.9 kaBP,the climate turned cool and wet.Climate and environmental changes archived in Dajiuhu peat respond to the global changes since the late-glacial period and can be contrasted to the changes recorded in other high-resolution archives from the East Asia Monsoon region,which take on the variety model that the monsoon strengthened abruptly after the late-glacial,was strong during the early Holocene,subse- quently declined and became weak after the middle Holocene with dry climate.According to our analysis,the driving mechanism should be the response of s  相似文献   

14.
The aim of the following paper is to present physical and sociogeographical positions, and basic characteristics of the Kras-i. e. the region, which was the original source of karstologyand to describe the transformation of the name of the region into international technical term(karst) as described in I. Gams's articles.  相似文献   

15.
Along with the development of internet, Web Services technology is a new branch of Web application program. and it has become a hotspot in computer science. However, it has not made great progress in research on Web Services security. Traditional security solutions cannot satisfy the Web Services security require of selective protection, endto-end security and application layer security. Web Services technology needs a solution integrated in Web Services frame work to realize end tc~end security. Based on cryptography and Web Services technology and according to W3C, XML encryption specification, XMI. digital Signature specification and WS-Security, which proposed by IBM and Microsoft. a new Web services security model based on message layer is put forward in this paper. The message layer is composed of message handlers. It is inserted into the message processing sequence and provides transparent security services for Web Services. To verify the model, a Web Services security systern is realized on . net platform. The implementation version of the model can provide various security services, and has advantages such as security, scalability, security controllability and end-to-end security in message level.  相似文献   

16.
After China entries WTO, China's 'textile · garment' industry will confront the difficulties of growth and development. From the view of supply and demand interaction which is common in the social economy, this article analyzes the economic construction and character of China's ' textile·garment' industry, represented by Shanghai. Research shows that industrial construction backwardness hinders China's 'textile·garment' industry development, which features four bottlenecks in supply and demand interaction in ' textile·garment' industry. The key of optimizing the construction and quality of supply and demand interaction in ' textile·garment' industry is to adjust industrial construction, break the bottlenecks, establish Shanghai as international fashion center, open middle and small size textile processing area with several levels, attach importance to scientific and technology creation and development combined with production, learning and research, and take part hi domestic and international marke  相似文献   

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18.
The author analyzes the existing problems in English for Tourism class and possible reasons why students are not highly motivated in oral communication practice : unconsciousness of the ongoing changing tourism industry, failure in their past learning, fear of losing faces, lack of words , structures and cultural background etc. Aiming to change the present situation and stimulate students'motivation in speaking, she offers some possible ways to the problems based on her perspectives:(1) choose authentic materials relevant to student's future career;(2)adapt a more current course book which is more authentically tourist-based in content.(3)adapt authentic video and TV tourist based materials related to the experience of tourism.(4)adapt authentic materials to make it more accessible and comprehensible by adding some proper authentic materials from different sources and tasks.(5)organize team activities based on authentic situations without changing the dialogue format in order to maintain redundancy of communication but in a real life focus.  相似文献   

19.
Conventional resource provision algorithms focus on how to maximize resource utilization and meet a fixed constraint of response time which be written in service level agreement(SLA).Unfortunately,the expected response time is highly variable and it is usually longer than the value of SLA.So,it leads to a poor resource utilization and unnecessary servers migration.We develop a framework for customer-driven dynamic resource allocation in cloud computing.Termed CDSMS(customer-driven service manage system),and the framework’s contributions are twofold.First,it can reduce the total migration times by adjusting the value of parameters of response time dynamically according to customers’profiles.Second,it can choose a best resource provision algorithm automatically in different scenarios to improve resource utilization.Finally,we perform a serious experiment in a real cloud computing platform.Experimental results show that CDSMS provides a satisfactory solution for the prediction of expected response time and the interval period between two tasks and reduce the total resource usage cost.  相似文献   

20.
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