In most existing CP-ABE schemes, there is only one authority in the system and all the public keys and private keys are issued by this authority, which incurs ciphertext size and computation costs in the encryption an...In most existing CP-ABE schemes, there is only one authority in the system and all the public keys and private keys are issued by this authority, which incurs ciphertext size and computation costs in the encryption and decryption operations that depend at least linearly on the number of attributes involved in the access policy. We propose an efficient multi-authority CP-ABE scheme in which the authorities need not interact to generate public information during the system initialization phase. Our scheme has constant ciphertext length and a constant number of pairing computations. Our scheme can be proven CPA-secure in random oracle model under the decision q-BDHE assumption. When user's attributes revocation occurs, the scheme transfers most re-encryption work to the cloud service provider, reducing the data owner's computational cost on the premise of security. Finally the analysis and simulation result show that the schemes proposed in this thesis ensure the privacy and secure access of sensitive data stored in the cloud server, and be able to cope with the dynamic changes of users' access privileges in large-scale systems. Besides, the multi-authority ABE eliminates the key escrow problem, achieves the length of ciphertext optimization and enhances the effi ciency of the encryption and decryption operations.展开更多
Using hydrographic data covering large areas of ocean for the period from June 21 to July 5 in 2009, we studied the circulation structure in the Luzon Strait area, examined the routes of water exchange between the Sou...Using hydrographic data covering large areas of ocean for the period from June 21 to July 5 in 2009, we studied the circulation structure in the Luzon Strait area, examined the routes of water exchange between the South China Sea （SCS） and the Philippine Sea, and estimated the volume transport through Luzon Strait. We found that the Kuroshio axis follows a e-shaped path slightly east of 121°E in the upper layer. With an increase in depth, the Kuroshio axis became gradually farther from the island of Luzon. To study the water exchange between the Philippine Sea and the SCS, identification of inflows and outflows is necessary. We first identified which flows contributed to the water exchange through Luzon Strait, which differs from the approach taken in previous studies. We determined that the obvious water exchange is in the section of 121°E. The westward inflow from the Philippine Sea into the SCS is 6.39 Sv in volume, and mainly in the 100-500 m layer at 19.5°-20°N （accounting for 4.40 Sv）, while the outflow from the SCS into the Philippine Sea is concentrated in the upper 100 m at 19°-20°N and upper 400 m at 21°-21.5°N, and below 240 m at 19°-19.5°N, accounting for 1.07, 3.02 and 3.43 Sv in volume transport, respectively.展开更多
This paper explores the film title design in Turkish cinema with the aim of understanding the link between Turkish cinema and Turkish graphic design. It is carried through first with the interviews with producers, dir...This paper explores the film title design in Turkish cinema with the aim of understanding the link between Turkish cinema and Turkish graphic design. It is carried through first with the interviews with producers, directors, title designers, and an extensive use of iconography and textual analysis has been made first between the title and the poster of the same film, and then the titles of the same period. The study focuses on the early period of Turkish cinema during a unique time of political, economical, and social change. In these years, the new Turkish Republic is born with very significant reforms such as the new alphabet. This has also been the time of the first fictional film, first sound film, and the first advertising agency and commercial poster in Turkish. The earliest title sequence that could be reached date back to 1932. From this year on, until the 1950s, which is named here as the early years of Turkish cinema, we see the kingdom of lettering where the typographic elements dominate the titles. During the kingdom of lettering, early Turkish film titles reflect the conditions of the time in terms of film production and the changing society. The paths of Turkish cinema and graphic design seem not to be fully crossed yet; nevertheless we witness the birth of a new visual form and a new nation in these titles展开更多
As former Fermatist, the author tried many times to prove Fermat＇s Last Theorem in an elementary way. Just few insights of the proposed schemes partially passed the peer-reviewing and they motivated the subsequent fr...As former Fermatist, the author tried many times to prove Fermat＇s Last Theorem in an elementary way. Just few insights of the proposed schemes partially passed the peer-reviewing and they motivated the subsequent fruitful collaboration with Prof. Mario De Paz. Among the author＇s failures, there is an unpublished proof emblematic of the FLT＇s charming power for the suggestive circumstances it was formulated. As sometimes happens with similar erroneous attempts, containing out-of-context hints, it provides a germinal approach to power sums yet to be refined.展开更多
In this paper, we study the notion of the enlarged observability for distributed parabolic systems, where the aim is to reconstruct the initial state between two prescribed profiles P1 and P2 in an internal subregion ...In this paper, we study the notion of the enlarged observability for distributed parabolic systems, where the aim is to reconstruct the initial state between two prescribed profiles P1 and P2 in an internal subregion c0 of the evolution domain f2. We give some definitions and properties of this concept, and then we solve the problem of the reconstruction of initial state using the Hilbert Uniqueness Method （HUM）. This leads to several interesting results which are performed through numerical example and simulations.展开更多
Courtesy of translation, the word ＂love＂ （lian ＂ai 恋爱） entered the modem Chinese language in the early 20th century, leading to changes in the mode, experience, meaning and evaluation of ＂feelings between men ...Courtesy of translation, the word ＂love＂ （lian ＂ai 恋爱） entered the modem Chinese language in the early 20th century, leading to changes in the mode, experience, meaning and evaluation of ＂feelings between men and women＂ by virtue of this new nomenclature. The word entered public discourse and became the point of entry for new Chinese ethical construction, spawning a series of new moral propositions from the late Qing to the May Fourth Movement together with corresponding works of new literature. The ＂free marriage＂ advocated in the late Qing confirmed the modem consciousness of marriage premised on love and determined primarily by the will of the parties themselves, initiating a new style of civilized marriage. In the early Republican period, the word ＂love＂ was temporarily stigmatized in the course of sinicization, with the result that it was generally avoided in romance fiction. However, the widespread cult of the ＂spiritual character of love＂ in novels of tragic love laid the foundation for the emergence of＂the sanctity of love＂ in the May Fourth period. The theory of love constructed at this time under the influence of Western theories made a subtle distinction between the ＂freedom of love＂ and ＂free love,＂ reflecting the ideological divergence within the New Culture community. In terms of spatial imagery and descriptions of love, the pioneering creation of romantic literature during the May Fourth period deconstructed the patriarchal authority that suppressed individual freedom, undermining traditional morality and opening up new fields for literary expression. But since the one-dimensional pursuit of individual freedom also led to weaknesses such as superficial emotionalism, May Fourth romantic literature could not take the experiences and expression of love to a deeper level.展开更多
基金supported by National Natural Science Foundation of China under Grant No.60873231Natural Science Foundation of Jiangsu Province under Grant No.BK2009426+1 种基金Major State Basic Research Development Program of China under Grant No.2011CB302903Key University Science Research Project of Jiangsu Province under Grant No.11KJA520002
文摘In most existing CP-ABE schemes, there is only one authority in the system and all the public keys and private keys are issued by this authority, which incurs ciphertext size and computation costs in the encryption and decryption operations that depend at least linearly on the number of attributes involved in the access policy. We propose an efficient multi-authority CP-ABE scheme in which the authorities need not interact to generate public information during the system initialization phase. Our scheme has constant ciphertext length and a constant number of pairing computations. Our scheme can be proven CPA-secure in random oracle model under the decision q-BDHE assumption. When user's attributes revocation occurs, the scheme transfers most re-encryption work to the cloud service provider, reducing the data owner's computational cost on the premise of security. Finally the analysis and simulation result show that the schemes proposed in this thesis ensure the privacy and secure access of sensitive data stored in the cloud server, and be able to cope with the dynamic changes of users' access privileges in large-scale systems. Besides, the multi-authority ABE eliminates the key escrow problem, achieves the length of ciphertext optimization and enhances the effi ciency of the encryption and decryption operations.
基金Supported by the Knowledge Innovation Program of the Chinese Academy of Sciences (No. KZCX1-YW-12)the National Natural Science Foundation of China (Nos. 41030855,41006013)
文摘Using hydrographic data covering large areas of ocean for the period from June 21 to July 5 in 2009, we studied the circulation structure in the Luzon Strait area, examined the routes of water exchange between the South China Sea （SCS） and the Philippine Sea, and estimated the volume transport through Luzon Strait. We found that the Kuroshio axis follows a e-shaped path slightly east of 121°E in the upper layer. With an increase in depth, the Kuroshio axis became gradually farther from the island of Luzon. To study the water exchange between the Philippine Sea and the SCS, identification of inflows and outflows is necessary. We first identified which flows contributed to the water exchange through Luzon Strait, which differs from the approach taken in previous studies. We determined that the obvious water exchange is in the section of 121°E. The westward inflow from the Philippine Sea into the SCS is 6.39 Sv in volume, and mainly in the 100-500 m layer at 19.5°-20°N （accounting for 4.40 Sv）, while the outflow from the SCS into the Philippine Sea is concentrated in the upper 100 m at 19°-20°N and upper 400 m at 21°-21.5°N, and below 240 m at 19°-19.5°N, accounting for 1.07, 3.02 and 3.43 Sv in volume transport, respectively.
文摘This paper explores the film title design in Turkish cinema with the aim of understanding the link between Turkish cinema and Turkish graphic design. It is carried through first with the interviews with producers, directors, title designers, and an extensive use of iconography and textual analysis has been made first between the title and the poster of the same film, and then the titles of the same period. The study focuses on the early period of Turkish cinema during a unique time of political, economical, and social change. In these years, the new Turkish Republic is born with very significant reforms such as the new alphabet. This has also been the time of the first fictional film, first sound film, and the first advertising agency and commercial poster in Turkish. The earliest title sequence that could be reached date back to 1932. From this year on, until the 1950s, which is named here as the early years of Turkish cinema, we see the kingdom of lettering where the typographic elements dominate the titles. During the kingdom of lettering, early Turkish film titles reflect the conditions of the time in terms of film production and the changing society. The paths of Turkish cinema and graphic design seem not to be fully crossed yet; nevertheless we witness the birth of a new visual form and a new nation in these titles
文摘As former Fermatist, the author tried many times to prove Fermat＇s Last Theorem in an elementary way. Just few insights of the proposed schemes partially passed the peer-reviewing and they motivated the subsequent fruitful collaboration with Prof. Mario De Paz. Among the author＇s failures, there is an unpublished proof emblematic of the FLT＇s charming power for the suggestive circumstances it was formulated. As sometimes happens with similar erroneous attempts, containing out-of-context hints, it provides a germinal approach to power sums yet to be refined.
文摘In this paper, we study the notion of the enlarged observability for distributed parabolic systems, where the aim is to reconstruct the initial state between two prescribed profiles P1 and P2 in an internal subregion c0 of the evolution domain f2. We give some definitions and properties of this concept, and then we solve the problem of the reconstruction of initial state using the Hilbert Uniqueness Method （HUM）. This leads to several interesting results which are performed through numerical example and simulations.
基金the initial research result of the National Social Science Fund Program of "Studies on Sexual Theory from the West and Modern Trends of Literary Thought in China."Its serial number is 11BZW123,and the title of the Chinese version is"The Emergence of‘Love’and Conceptual Changes in Modern Literature"("恋爱"之发生与现代文学观念变迁)
文摘Courtesy of translation, the word ＂love＂ （lian ＂ai 恋爱） entered the modem Chinese language in the early 20th century, leading to changes in the mode, experience, meaning and evaluation of ＂feelings between men and women＂ by virtue of this new nomenclature. The word entered public discourse and became the point of entry for new Chinese ethical construction, spawning a series of new moral propositions from the late Qing to the May Fourth Movement together with corresponding works of new literature. The ＂free marriage＂ advocated in the late Qing confirmed the modem consciousness of marriage premised on love and determined primarily by the will of the parties themselves, initiating a new style of civilized marriage. In the early Republican period, the word ＂love＂ was temporarily stigmatized in the course of sinicization, with the result that it was generally avoided in romance fiction. However, the widespread cult of the ＂spiritual character of love＂ in novels of tragic love laid the foundation for the emergence of＂the sanctity of love＂ in the May Fourth period. The theory of love constructed at this time under the influence of Western theories made a subtle distinction between the ＂freedom of love＂ and ＂free love,＂ reflecting the ideological divergence within the New Culture community. In terms of spatial imagery and descriptions of love, the pioneering creation of romantic literature during the May Fourth period deconstructed the patriarchal authority that suppressed individual freedom, undermining traditional morality and opening up new fields for literary expression. But since the one-dimensional pursuit of individual freedom also led to weaknesses such as superficial emotionalism, May Fourth romantic literature could not take the experiences and expression of love to a deeper level.
