White noise deconvolution or input white noise estimation problem has important appli-cation backgrounds in oil seismic exploration,communication and signal processing.By the modern time series analysis method,based o...White noise deconvolution or input white noise estimation problem has important appli-cation backgrounds in oil seismic exploration,communication and signal processing.By the modern time series analysis method,based on the Auto-Regressive Moving Average(ARMA) innovation model,under the linear minimum variance optimal fusion rules,three optimal weighted fusion white noise deconvolution estimators are presented for the multisensor systems with time-delayed measurements and colored measurement noises.They can handle the input white noise fused filtering,prediction and smoothing problems.The accuracy of the fusers is higher than that of each local white noise estimator.In order to compute the optimal weights,the formula of computing the local estimation error cross-covariances is given.A Monte Carlo simulation example for the system with 3 sensors and the Bernoulli-Gaussian input white noise shows their effectiveness and performances.展开更多
In his 1945 study of Djuna Barne's Nightwood, Joseph Frank analyzes a crucial technique of modernist literature, the substitution of spatial relationships for temporal progression as a formal metaphor of thematic dev...In his 1945 study of Djuna Barne's Nightwood, Joseph Frank analyzes a crucial technique of modernist literature, the substitution of spatial relationships for temporal progression as a formal metaphor of thematic development. Starting with Gustave Flaubert and recognizing his efforts to duplicate the simultaneity of action possible in drama and later in film, Frank comments that since language proceeds in time, it is possible to approach this simultaneity of perception only by breaking up temporal sequence. While Flaubert introduces this method, it does not become a dominant form until James Joyce's Ulysses. According to Frank, spatialization of form in this novel provides an alternative to the chronological development normal to verbal structures, which can be read only in a linear fashion through time, unlike painting and the plastic arts, which can be visually apprehended instantaneously. Applied to Ulysses as a whole by Joseph Frank, the conception of spatial form might as well serve as a convenient point of departure for the analysis on much smaller, let's say, "episodic" scale. In "Nausicaa" episode, Joyce dissolves temporal sequence by cutting back and forth between the various levels of action in a slowly-rising crescendo to achieve the unified impact, the sense of simultaneous activity occurring in different places. For the duration of the episode the time-flow of the narrative is halted: various levels of action are juxtaposed independently of the progress of the narrative. Joyce, in this fragmentation of narrative structure, proceeded on the assumption that a unified spatial apprehension of not only separate episodes but his entire work would ultimately be possible.展开更多
The treatise attempts at a philosophical analysis of the category-----public area. It points out the dissension between the traditional and postmodern definition of this conception and the consequences resulting from ...The treatise attempts at a philosophical analysis of the category-----public area. It points out the dissension between the traditional and postmodern definition of this conception and the consequences resulting from these different attitudes. As far as the methodology is concerned, the study is based on J. F. Lyotard, presenting the postmodern approach as a greater contribution. In postmodern public area, we can meet two basic types of dissentions, while only the first of them can be solved by further grow of specialization and the expert likes to know.展开更多
The article presents the results of recent investigations into Holter monitoring of ECG, using non-linear analysis methods. This paper discusses one of the modern methods of time series analysis--a method of determini...The article presents the results of recent investigations into Holter monitoring of ECG, using non-linear analysis methods. This paper discusses one of the modern methods of time series analysis--a method of deterministic chaos theory. It involves the transition from study of the characteristics of the signal to the investigation of metric (and probabilistic) properties of the reconstructed attractor of the signal. It is shown that one of the most precise characteristics of the functional state of biological systems is the dynamical trend of correlation dimension and entropy of the reconstructed attractor. On the basis of this it is suggested that a complex programming apparatus be created for calculating these characteristics on line. A similar programming product is being created now with the support of RFBR. The first results of the working program, its adjustment, and further development, are also considered in the article.展开更多
At the base of the reflection developed in this research work, there is the concept of habitat as a system, as an articulated "whole" that cannot be explained with the simple sum of its parts. The concept of habitat...At the base of the reflection developed in this research work, there is the concept of habitat as a system, as an articulated "whole" that cannot be explained with the simple sum of its parts. The concept of habitat, in fact, implies issues of dialectic spaces, in other words, those settings that can be defined as relational subsystems within the urban/domestic scale. This essay has its roots in the CIAM (Congr^s International d'Architecture Moderne (in English: International Congress of Modem Architecture)) of 1953, during which the complementarity of the outside space next to the dwelling and its relevance within the project discipline, have been affirmed. In particular, assimilating the lesson of Aldo van Eyck, this work investigates the deepest issues of the concept of threshold. The analysis makes use of the work-tools of critical reading and comparison between urban and rural habitats, with different density levels, whose relational fabrics have been layering over time permeable "thicknesses" which articulate complex threshold spatial configurations.展开更多
The article deals with investigating and comparing key modern and postmodern interpretations of St. Francis of Assisi from a philosophical-anthropological perspective. We determine these interpretations to be as foll...The article deals with investigating and comparing key modern and postmodern interpretations of St. Francis of Assisi from a philosophical-anthropological perspective. We determine these interpretations to be as follows: a man of wonder and lover of wisdom, in other words, a true philosopher; hero of all times; defender of the poverty and poor; “champion of liberty”; peace-maker and pacifist; God's troubadour; patron of nature and animals. All of these manifestations of St. Francis' personality have been enriched by his Christocentrism and joyful vision. Moreover, this can be traced in primary sources and also echoes in the late modern period. Postmodernity not only incorporated similar motives into the cultural space with new focus and accent, but it also put forward some new visions. St. Francis was postulated as God's Fool, not so much in the medieval as in the postmodern sense of foolishness and madness as a way of interaction with the absurd and puzzle-like world in which we live. It also reconciles traditional opposition between joy and laughter as inner feelings and outward emotions within the frame of the postmodern Divine Comedy.展开更多
This paper presents the contemporary motion and active deformation of South America plate and relative motion of Nazca-South America plate using space geodetic data. The South America plate is moving at average 14.5 m...This paper presents the contemporary motion and active deformation of South America plate and relative motion of Nazca-South America plate using space geodetic data. The South America plate is moving at average 14.5 mm/a with an azimuth of 15.2° and shrinking in the west-east at 10.9 mm/a. The geodetic deformations of sites with respect to the South America plate are in quite good agreement with the estimated deformations from NNR-NUVEL1A, but the deformation of the western South America regions is very large.展开更多
Cities' urban morphology is the result of historic, cultural, political and social processes. The historical cores in Mexican cities have high cultural diversity, which also intermingle pre-Hispanic cultures with col...Cities' urban morphology is the result of historic, cultural, political and social processes. The historical cores in Mexican cities have high cultural diversity, which also intermingle pre-Hispanic cultures with colonial forms, as well with modernity and post-modernity irruption. The case study is Santa Barbara's neighborhood in Toluca City, which was founded in 1524, and the case study was the first neighborhood in Toluca's historical core. At present time, this neighborhood is considered as one of the most dangerous places in the city's historical core, therefore, it has been abandoned. This paper will display the changes in urban morphology of the neighborhood through the years from 1877 to 2010. For site evaluation, the methodologies of Ashihara (1982) and Lynch's (1961) were used in order to analyze positive and negative spaces, as well as main street visual features, street and avenue directions, street circulation and street circulation path configuration. The results show that the focal nodes are a key factor for economic and social reactivation, with which, through urban activation of vacant lots and the traditional use of the streets as public space, is possible to generate centripetal development to restructure the neighborhood.展开更多
The purpose of this paper is to show that autobiographical works like Gabrielle Roy's Enchantment and Sorrow (1988) and R6gine Robin's La Qudbdcoite (1983), do not succeed in anchoring the self and eliminating p...The purpose of this paper is to show that autobiographical works like Gabrielle Roy's Enchantment and Sorrow (1988) and R6gine Robin's La Qudbdcoite (1983), do not succeed in anchoring the self and eliminating past traumatic experiences. These writers realize that they cannot reincarnate their former 'T' as time has passed and their lives have changed. The self does not let itself be reduced to a definite being but on the contrary mirrors itsef in all its surroundings. Writing the fragmentation of the self makes these authobiographies appear on one hand, fictional as the "I" always eludes itself. But on the other hand, they best describe the postmodern 'T' who is conscious of the permeability of one's own self as well inwards by the influences, the collages of others on the Self as outwards by the projection of the self onto others, like rhizome connecting to others and forming a web of exchanges like in cyberspace展开更多
The relationship between time and consciousness is what T. S. Eliot concerns much in his early modernist poem The love song of J. Alfred Prufrock. This paper is an analysis of the way Eliot employs the stream of consc...The relationship between time and consciousness is what T. S. Eliot concerns much in his early modernist poem The love song of J. Alfred Prufrock. This paper is an analysis of the way Eliot employs the stream of consciousness technique to create a typical Western modern man who suffers greatly from meaningless life and spiritual crisis.展开更多
Few would deny the nobility of an animal which has played a significant role, historically, in the lives of humankind: the fabled unicorn, the Trojan Horse, and Pegasus, together with the Houyhnhnms of Jonathan Swift...Few would deny the nobility of an animal which has played a significant role, historically, in the lives of humankind: the fabled unicorn, the Trojan Horse, and Pegasus, together with the Houyhnhnms of Jonathan Swift are testaments to the nobility of horses. In a modern context, Seabiscuit, Black Beauty, Silver, steed of the iconic Lone Ranger, and Tir na nog, from Irish folk tale history, have maintained the tradition of nobility. High comedic elements such as TV's Mr. Ed, Aspercel, from The Horse in the Gray Flannel Suit (1968), Ollie, of Laurel and Hardy fame, reincarnated as a horse, and Tir na nog, hiding in an elevator to avoid being apprehended by the law, help to complete the comedic portrait of equine nobility展开更多
The current study investigated the value and significance of the existence of the old industrial buildings, as well as the necessity and difficulty to renovate the design. Combined with successful cases, this study an...The current study investigated the value and significance of the existence of the old industrial buildings, as well as the necessity and difficulty to renovate the design. Combined with successful cases, this study analyzed and showed that one should not only deal with the relationship between the original architectural style and construction of modem cities in the process of renovation design of the old industrial building space. More attention should also be paid to create new space to meet the functional requirements of the modem features, and then complete substantial renovation of old industrial building space through the innovative design. In the use of aesthetic innovative design for the renovation of the old industrial building space, people must respect the space of old industrial buildings as the prerequisite of the renovation design. It is needed to expound the local space reconstruction methods and design principles respectively on the basis of respect. And then one should grasp the whole space and make the structured design and reasonable use according to the new space functional requirements of different functional areas. This paper attempted to learn from environmental art study on the renovation of old industrial buildings space and in terms of innovative design. The authors explored the innovative thinking on the renovation design of old industrial building space through the analysis of the reality.展开更多
From a strategic perspective,the paper presents a forward-looking thinking supported by interdisciplinary of modern logistics,estuary and coast,environment and ecology,economic management and mathematical statistics. ...From a strategic perspective,the paper presents a forward-looking thinking supported by interdisciplinary of modern logistics,estuary and coast,environment and ecology,economic management and mathematical statistics. It leads to a reasonable solution to space expansion by reclamation. Construction of new deepwater terminal is the best usage of land resources and can strengthen the status of Shanghai as an international shipping center,thus support the preparation and strategic decision of future urban development of Shanghai.展开更多
Simulation is an important and useful technique helping users understand and model real life systems. Once built, the models can run proving realistic results. This supports making decisions on a more logical and scie...Simulation is an important and useful technique helping users understand and model real life systems. Once built, the models can run proving realistic results. This supports making decisions on a more logical and scientific basis. The paper introduces method of simulation, and describes various types of its application. The authors used the method of analysis of the creation and implementation of the programme code. The authors compared parallel instruction of computing defined to pipelined instructions. The power of simulation is that a common model can be used to design a large variety of systems. An important aspect of the simulation method is that a simulation model is designed to be repeated in actual computer systems, especially in multicore processors. For this reason, it is important to minimize average waiting time for fetch and decode stage instructions. The objective of the research is to prove that the parallel operation of programme code is faster than sequential operation code on the multi processor architecture. The system modeling uses methods and simulation on the parallel computer systems is very precise. The time benefit gained in simulation of mathematical model on the pipeline processor is higher than the one in simulation of mathematical model on the multi processors computer system.展开更多
The multi-media music teaching is to make video projector, video display, computer, TV, video order, CD, VCD, booth, acoustics, teaching software, and other media become an organic whole, and it is the floorboard of t...The multi-media music teaching is to make video projector, video display, computer, TV, video order, CD, VCD, booth, acoustics, teaching software, and other media become an organic whole, and it is the floorboard of the modem teaching equipment. Multimedia technology takes advantages of media combination including text, images, animation, sound that can hold information, it provides variegated and multidimensional teaching information space for the music teaching by the form of text, sound, music and so on, it makes the teaching content and mode of music teaching better improvement and enrichment, and it provides the technical support for music education modernization, and it is a new technology which is introduced into the field of teaching in recent years. Mastering the function of multimedia teaching as soon as possible and applying it effectively to music classroom teaching is the need of modem education reform and development.展开更多
Spontaneous symmetry breaking has revolutionized the understanding in numerous fields of modern physics. Here, we theoretically demonstrate the spontaneous time-reversal symmetry breaking in a cavity quantum electrody...Spontaneous symmetry breaking has revolutionized the understanding in numerous fields of modern physics. Here, we theoretically demonstrate the spontaneous time-reversal symmetry breaking in a cavity quantum electrodynamics system in which an atomic ensemble interacts coherently with a single resonant cavity mode. The interacting system can be effectively described by two coupled oscillators with positive and negative mass, when the two-level atoms are prepared in their excited states. The occurrence of symmetry breaking is controlled by the atomic detuning and the coupling to the cavity mode,which naturally divides the parameter space into the symmetry broken and symmetry unbroken phases.The two phases are separated by a spectral singularity, a so-called exceptional point, where the eigenstates of the Hamiltonian coalesce. When encircling the singularity in the parameter space, the quasiadiabatic dynamics shows chiral mode switching which enables topological manipulation of quantum states.展开更多
基金Supported by the National Natural Science Foundation of China (No.60874063)Science and Technology Re-search Foundation of Heilongjiang Education Department (No.11523037)
文摘White noise deconvolution or input white noise estimation problem has important appli-cation backgrounds in oil seismic exploration,communication and signal processing.By the modern time series analysis method,based on the Auto-Regressive Moving Average(ARMA) innovation model,under the linear minimum variance optimal fusion rules,three optimal weighted fusion white noise deconvolution estimators are presented for the multisensor systems with time-delayed measurements and colored measurement noises.They can handle the input white noise fused filtering,prediction and smoothing problems.The accuracy of the fusers is higher than that of each local white noise estimator.In order to compute the optimal weights,the formula of computing the local estimation error cross-covariances is given.A Monte Carlo simulation example for the system with 3 sensors and the Bernoulli-Gaussian input white noise shows their effectiveness and performances.
文摘In his 1945 study of Djuna Barne's Nightwood, Joseph Frank analyzes a crucial technique of modernist literature, the substitution of spatial relationships for temporal progression as a formal metaphor of thematic development. Starting with Gustave Flaubert and recognizing his efforts to duplicate the simultaneity of action possible in drama and later in film, Frank comments that since language proceeds in time, it is possible to approach this simultaneity of perception only by breaking up temporal sequence. While Flaubert introduces this method, it does not become a dominant form until James Joyce's Ulysses. According to Frank, spatialization of form in this novel provides an alternative to the chronological development normal to verbal structures, which can be read only in a linear fashion through time, unlike painting and the plastic arts, which can be visually apprehended instantaneously. Applied to Ulysses as a whole by Joseph Frank, the conception of spatial form might as well serve as a convenient point of departure for the analysis on much smaller, let's say, "episodic" scale. In "Nausicaa" episode, Joyce dissolves temporal sequence by cutting back and forth between the various levels of action in a slowly-rising crescendo to achieve the unified impact, the sense of simultaneous activity occurring in different places. For the duration of the episode the time-flow of the narrative is halted: various levels of action are juxtaposed independently of the progress of the narrative. Joyce, in this fragmentation of narrative structure, proceeded on the assumption that a unified spatial apprehension of not only separate episodes but his entire work would ultimately be possible.
文摘The treatise attempts at a philosophical analysis of the category-----public area. It points out the dissension between the traditional and postmodern definition of this conception and the consequences resulting from these different attitudes. As far as the methodology is concerned, the study is based on J. F. Lyotard, presenting the postmodern approach as a greater contribution. In postmodern public area, we can meet two basic types of dissentions, while only the first of them can be solved by further grow of specialization and the expert likes to know.
文摘The article presents the results of recent investigations into Holter monitoring of ECG, using non-linear analysis methods. This paper discusses one of the modern methods of time series analysis--a method of deterministic chaos theory. It involves the transition from study of the characteristics of the signal to the investigation of metric (and probabilistic) properties of the reconstructed attractor of the signal. It is shown that one of the most precise characteristics of the functional state of biological systems is the dynamical trend of correlation dimension and entropy of the reconstructed attractor. On the basis of this it is suggested that a complex programming apparatus be created for calculating these characteristics on line. A similar programming product is being created now with the support of RFBR. The first results of the working program, its adjustment, and further development, are also considered in the article.
文摘At the base of the reflection developed in this research work, there is the concept of habitat as a system, as an articulated "whole" that cannot be explained with the simple sum of its parts. The concept of habitat, in fact, implies issues of dialectic spaces, in other words, those settings that can be defined as relational subsystems within the urban/domestic scale. This essay has its roots in the CIAM (Congr^s International d'Architecture Moderne (in English: International Congress of Modem Architecture)) of 1953, during which the complementarity of the outside space next to the dwelling and its relevance within the project discipline, have been affirmed. In particular, assimilating the lesson of Aldo van Eyck, this work investigates the deepest issues of the concept of threshold. The analysis makes use of the work-tools of critical reading and comparison between urban and rural habitats, with different density levels, whose relational fabrics have been layering over time permeable "thicknesses" which articulate complex threshold spatial configurations.
文摘The article deals with investigating and comparing key modern and postmodern interpretations of St. Francis of Assisi from a philosophical-anthropological perspective. We determine these interpretations to be as follows: a man of wonder and lover of wisdom, in other words, a true philosopher; hero of all times; defender of the poverty and poor; “champion of liberty”; peace-maker and pacifist; God's troubadour; patron of nature and animals. All of these manifestations of St. Francis' personality have been enriched by his Christocentrism and joyful vision. Moreover, this can be traced in primary sources and also echoes in the late modern period. Postmodernity not only incorporated similar motives into the cultural space with new focus and accent, but it also put forward some new visions. St. Francis was postulated as God's Fool, not so much in the medieval as in the postmodern sense of foolishness and madness as a way of interaction with the absurd and puzzle-like world in which we live. It also reconciles traditional opposition between joy and laughter as inner feelings and outward emotions within the frame of the postmodern Divine Comedy.
文摘This paper presents the contemporary motion and active deformation of South America plate and relative motion of Nazca-South America plate using space geodetic data. The South America plate is moving at average 14.5 mm/a with an azimuth of 15.2° and shrinking in the west-east at 10.9 mm/a. The geodetic deformations of sites with respect to the South America plate are in quite good agreement with the estimated deformations from NNR-NUVEL1A, but the deformation of the western South America regions is very large.
文摘Cities' urban morphology is the result of historic, cultural, political and social processes. The historical cores in Mexican cities have high cultural diversity, which also intermingle pre-Hispanic cultures with colonial forms, as well with modernity and post-modernity irruption. The case study is Santa Barbara's neighborhood in Toluca City, which was founded in 1524, and the case study was the first neighborhood in Toluca's historical core. At present time, this neighborhood is considered as one of the most dangerous places in the city's historical core, therefore, it has been abandoned. This paper will display the changes in urban morphology of the neighborhood through the years from 1877 to 2010. For site evaluation, the methodologies of Ashihara (1982) and Lynch's (1961) were used in order to analyze positive and negative spaces, as well as main street visual features, street and avenue directions, street circulation and street circulation path configuration. The results show that the focal nodes are a key factor for economic and social reactivation, with which, through urban activation of vacant lots and the traditional use of the streets as public space, is possible to generate centripetal development to restructure the neighborhood.
文摘The purpose of this paper is to show that autobiographical works like Gabrielle Roy's Enchantment and Sorrow (1988) and R6gine Robin's La Qudbdcoite (1983), do not succeed in anchoring the self and eliminating past traumatic experiences. These writers realize that they cannot reincarnate their former 'T' as time has passed and their lives have changed. The self does not let itself be reduced to a definite being but on the contrary mirrors itsef in all its surroundings. Writing the fragmentation of the self makes these authobiographies appear on one hand, fictional as the "I" always eludes itself. But on the other hand, they best describe the postmodern 'T' who is conscious of the permeability of one's own self as well inwards by the influences, the collages of others on the Self as outwards by the projection of the self onto others, like rhizome connecting to others and forming a web of exchanges like in cyberspace
文摘The relationship between time and consciousness is what T. S. Eliot concerns much in his early modernist poem The love song of J. Alfred Prufrock. This paper is an analysis of the way Eliot employs the stream of consciousness technique to create a typical Western modern man who suffers greatly from meaningless life and spiritual crisis.
文摘Few would deny the nobility of an animal which has played a significant role, historically, in the lives of humankind: the fabled unicorn, the Trojan Horse, and Pegasus, together with the Houyhnhnms of Jonathan Swift are testaments to the nobility of horses. In a modern context, Seabiscuit, Black Beauty, Silver, steed of the iconic Lone Ranger, and Tir na nog, from Irish folk tale history, have maintained the tradition of nobility. High comedic elements such as TV's Mr. Ed, Aspercel, from The Horse in the Gray Flannel Suit (1968), Ollie, of Laurel and Hardy fame, reincarnated as a horse, and Tir na nog, hiding in an elevator to avoid being apprehended by the law, help to complete the comedic portrait of equine nobility
文摘The current study investigated the value and significance of the existence of the old industrial buildings, as well as the necessity and difficulty to renovate the design. Combined with successful cases, this study analyzed and showed that one should not only deal with the relationship between the original architectural style and construction of modem cities in the process of renovation design of the old industrial building space. More attention should also be paid to create new space to meet the functional requirements of the modem features, and then complete substantial renovation of old industrial building space through the innovative design. In the use of aesthetic innovative design for the renovation of the old industrial building space, people must respect the space of old industrial buildings as the prerequisite of the renovation design. It is needed to expound the local space reconstruction methods and design principles respectively on the basis of respect. And then one should grasp the whole space and make the structured design and reasonable use according to the new space functional requirements of different functional areas. This paper attempted to learn from environmental art study on the renovation of old industrial buildings space and in terms of innovative design. The authors explored the innovative thinking on the renovation design of old industrial building space through the analysis of the reality.
基金Shanghai Science and Technology Research Plan(No.13dz1204900)
文摘From a strategic perspective,the paper presents a forward-looking thinking supported by interdisciplinary of modern logistics,estuary and coast,environment and ecology,economic management and mathematical statistics. It leads to a reasonable solution to space expansion by reclamation. Construction of new deepwater terminal is the best usage of land resources and can strengthen the status of Shanghai as an international shipping center,thus support the preparation and strategic decision of future urban development of Shanghai.
文摘Simulation is an important and useful technique helping users understand and model real life systems. Once built, the models can run proving realistic results. This supports making decisions on a more logical and scientific basis. The paper introduces method of simulation, and describes various types of its application. The authors used the method of analysis of the creation and implementation of the programme code. The authors compared parallel instruction of computing defined to pipelined instructions. The power of simulation is that a common model can be used to design a large variety of systems. An important aspect of the simulation method is that a simulation model is designed to be repeated in actual computer systems, especially in multicore processors. For this reason, it is important to minimize average waiting time for fetch and decode stage instructions. The objective of the research is to prove that the parallel operation of programme code is faster than sequential operation code on the multi processor architecture. The system modeling uses methods and simulation on the parallel computer systems is very precise. The time benefit gained in simulation of mathematical model on the pipeline processor is higher than the one in simulation of mathematical model on the multi processors computer system.
文摘The multi-media music teaching is to make video projector, video display, computer, TV, video order, CD, VCD, booth, acoustics, teaching software, and other media become an organic whole, and it is the floorboard of the modem teaching equipment. Multimedia technology takes advantages of media combination including text, images, animation, sound that can hold information, it provides variegated and multidimensional teaching information space for the music teaching by the form of text, sound, music and so on, it makes the teaching content and mode of music teaching better improvement and enrichment, and it provides the technical support for music education modernization, and it is a new technology which is introduced into the field of teaching in recent years. Mastering the function of multimedia teaching as soon as possible and applying it effectively to music classroom teaching is the need of modem education reform and development.
基金supported by the National Key R&D Program of China(2016YFA0301302)the National Natural Science Foundation of China(61435001,11654003,11474011)High-performance Computing Platform of Peking University
文摘Spontaneous symmetry breaking has revolutionized the understanding in numerous fields of modern physics. Here, we theoretically demonstrate the spontaneous time-reversal symmetry breaking in a cavity quantum electrodynamics system in which an atomic ensemble interacts coherently with a single resonant cavity mode. The interacting system can be effectively described by two coupled oscillators with positive and negative mass, when the two-level atoms are prepared in their excited states. The occurrence of symmetry breaking is controlled by the atomic detuning and the coupling to the cavity mode,which naturally divides the parameter space into the symmetry broken and symmetry unbroken phases.The two phases are separated by a spectral singularity, a so-called exceptional point, where the eigenstates of the Hamiltonian coalesce. When encircling the singularity in the parameter space, the quasiadiabatic dynamics shows chiral mode switching which enables topological manipulation of quantum states.