Upon flaws of current blockchain platforms of heavyweight, large capacity of ledger, and time-consuming of synchronization of data, in this paper, we proposed a new paradigm of master-slave blockchain scheme(MSB) for ...Upon flaws of current blockchain platforms of heavyweight, large capacity of ledger, and time-consuming of synchronization of data, in this paper, we proposed a new paradigm of master-slave blockchain scheme(MSB) for pervasive computing that suitable for general PC, mobile device such as smart phones or PADs to participants in the working of mining and verification, in which we separated traditional blockchain model in 2 layer defined as master node layer and a series of slavery agents layer, then we proposed 2 approaches for partially computing model(PCM) and non-computing of model(NCM) in the MSB blockchain, Finally large amounts of simulations manifest the proposed master-slave blockchain scheme is feasible, extendible and suitable for pervasive computing especially in the 5 G generation environment, and can apply in the DRM-related applications.展开更多
In the harsh environment where n ode density is sparse, the slow-moving nodes cannot effectively utilize the encountering opportunities to realize the self-organized identity authentications, and do not have the chanc...In the harsh environment where n ode density is sparse, the slow-moving nodes cannot effectively utilize the encountering opportunities to realize the self-organized identity authentications, and do not have the chance to join the network routing. However, considering m ost of the communications in opportunistic networks are caused by forwarding operations, there is no need to establish the complete mutual authentications for each conversation. Accordingly, a novel trust management scheme is presented based on the information of behavior feedback, in order to complement the insufficiency of identity authentications. By utilizing the certificate chains based on social attributes, the mobile nodes build the local certificate graphs gradually to realize the web of "Identity Trust" relationship. Meanwhile, the successors generate Verified Feedback Packets for each positive behavior, and consequently the "Behavior Trust" relationship is formed for slow-moving nodes. Simulation result shows that, by implementing our trust scheme, the d elivery probability and trust reconstruction ratio can be effectively improved when there are large numbers of compromised nodes, and it means that our trust management scheme can efficiently explore and filter the trust nodes for secure forwarding in opportunistic networks.展开更多
The theory of scientific management exerts a far-reaching influence in the history of management. This paper challenges some one-sided comments on Taylorism and emphasizes more on its cultural implication. By analyzin...The theory of scientific management exerts a far-reaching influence in the history of management. This paper challenges some one-sided comments on Taylorism and emphasizes more on its cultural implication. By analyzing the key features and background of scientific management, we prove why it appeals to European avant-garde modernists. In the end I expose a forgotten cultural implication of this organizational theory by explaining scientific management' s "lost" aesthetic and make a conclusion.展开更多
Since taking office, the Trump administration's anti-terrorism policy has become increasingly clear. Its anti-terrorism measures and its internal and external anti-terrorism policies have introduced new features t...Since taking office, the Trump administration's anti-terrorism policy has become increasingly clear. Its anti-terrorism measures and its internal and external anti-terrorism policies have introduced new features that are distinct from those of the Obama administration. These include linking terrorism to Islam, violating traditional political correctness in order to enhance homeland security, sending large-scale troops to the Middle East, and delegating more authority to the US Defense Department and the Armed Forces. Trump's anti-terrorism policies have made obvious progress both at home and abroad. Along with the adjustment of its national security strategy, the status of the anti-terrorism policy in Trump's national security strategy and national defense strategy will decline.However, for the foreseeable future, anti-terrorism will remain an important issue for the Trump Administration, and in some circumstances,the investment for it may increase.展开更多
Macbeth was wary when he heard the witches out. He deliberated. He dithered. And Lady Macbeth puckered his courage up to the hilt and egged him on to murder. Macbeth murdered. Then he balked. He hallucinated himself o...Macbeth was wary when he heard the witches out. He deliberated. He dithered. And Lady Macbeth puckered his courage up to the hilt and egged him on to murder. Macbeth murdered. Then he balked. He hallucinated himself out of his wits. Then he went on a rampage to save his own skin. He destroyed in fear of being destroyed. Yet all he ended up doing is losing his peace, his composure, his wife, and finally, his life. The whole of Operation Kingship, if the author may so call the whole business of eliminating Duncan out of the way of the royal throne, failed miserably. Macbeth, on the lookout for power found himself terribly, fearfully beaten, crestfallen, devastated. The million-dollar question then is -what is it that went so very wrong in the whole process? Critics are often heard to cry his ambition--his "overvaulting ambition" down as his incorrigible hamartia. But living in the 21st century, one gets to hear that ambition is not bad after all--the higher the "ambi-horse" vaults, the higher the chances of success is. In this dissertation, the author proposes to analyze Macbeth's case from the perspective of management studies. This paper, more than setting forth a literary statement of Macbeth's predicament, aims at what management Gurus would love to call a candid SWOT (strength, weakness, opportunity, threat) and STEEPLED (social, technological, economic, educational, political, legal, environmental, and demographic factors) analysis of Macbeth's situation to find out where the shoe pinched, whether the whole project crashed because of inefficient leadership, or whether there was no leadership at all, whether organizational strategies were not properly formulated or whether the implementation capsized horribly, thereby making the whole business a rudderless wild goose chase. The discussion necessarily follows up with an insight into what Macbeth lacked as far as Maslow's Pyramid of Needs is concerned and what it could have been like, had it been rewritten with a corporate-friendly, management-savvy 21st century protagonist armed with well formulated action plans and stronger inter-personal skills, in the titular lead.展开更多
Public economics is a science of studying government economic behaviors, and an interdiscipline of politics and economics. As China is at the primary stage of socialism and the development of various domestic causes i...Public economics is a science of studying government economic behaviors, and an interdiscipline of politics and economics. As China is at the primary stage of socialism and the development of various domestic causes is still in a period of exploration, it is very important for the reform of the socialist modernization to strengthen domestic administrative management. Society is the subject of national reform and development in the long run, and thus maintaining the stability of domestic social order is not only the prerequisite for the long-term survival and development of China, but also the key requirement of ensuring people to live and work in peace and contentment. This thesis, first of all, introduces the management concept of public economy and the necessity of government's involvement in supervising economy. And on the basis of these, the thesis put forward the direction of transforming government economic functions and several precautions that should be noticed in government economic behaviors.展开更多
In this paper, we research on the higher education management mode of China and America based on the perspective of operation mechanism, separation of school and the government. As the thought of higher education mana...In this paper, we research on the higher education management mode of China and America based on the perspective of operation mechanism, separation of school and the government. As the thought of higher education management theory or a form, we jump out of the labyrinth of modernism manages view and the introduction of totally different from the modernist paradigm, from the angle of the theory research of postmodernism manages view. The paper is organized as the follows. In the first section, we generally introduce the basic concepts of higher education management and the relationship of the schools and government. Then, by comparing the pattern of the Chinese and the American, we analyze the difference in detail. Finally, we set up the prospect and the conclusion. In conclusion, our method combines the advantages of the American higher education management model which will be meaningful.展开更多
The rise of the anirne subculture assembles the huge youth groups in the construction of the socialist core value system, and provides a new carrier and injected into the innovative dynamic. At the same time, their pe...The rise of the anirne subculture assembles the huge youth groups in the construction of the socialist core value system, and provides a new carrier and injected into the innovative dynamic. At the same time, their perverse behavior and exaggerated style of dress and the strange language constitute the alienation and challenges of a core value system. It should strengthen the ideological review and classification management, with the criticism of the mainstream media to enhance the vigilance of the community, as well as through commercial activities to digest rebel style, which is the effective way to promote the core value system.展开更多
This article is about the methods and techniques used in the building "retrofit" in modernist style designed by the architect Affonso Eduardo Reidy in the fifties, and also about the project of the new Rio de Janeir...This article is about the methods and techniques used in the building "retrofit" in modernist style designed by the architect Affonso Eduardo Reidy in the fifties, and also about the project of the new Rio de Janeiro MIS (Museum of Image and Sound), under construction, by The North-American office Diller Scofidio + Renfro, both located in the city of Rio de Janeiro. These constructions present a wide view of the concept of sustainability, not commonly used in public buildings in Brazil. In the building designed by Reidy, which belongs to the State of Rio de Janeiro, the regeneration to host the new headquarters of the State Department of Taxation and Finance respected its original characteristics and used smart and sustainable design techniques, as well as recyclable materials. On the other hand, the project of the new museum at Copacabana Beach was entirely planned on sustainable bases and it includes the application of building techniques concerning that purpose. This article presents a study of these two cases and evaluates the techniques and materials used in one another. Observing the principles of sustainability in construction is a pioneering initiative of the State Government. This article aims at making the scientific community aware of the needs of immediate adoption of sustainability techniques in Civil Engineering, not only in the construction of new buildings, but also in the regeneration of the existing ones, as well as the need of imperious adoption of sustainable techniques when it comes to maintainability.展开更多
The aim of this study is to examine the effects of family involvement and altruism on agency costs of equity and debt, as well on the performance of small family businesses. To achieve this objective, the authors revi...The aim of this study is to examine the effects of family involvement and altruism on agency costs of equity and debt, as well on the performance of small family businesses. To achieve this objective, the authors reviewed the literature on family business. Drawing from agency theory and stewardship theory, the authors also proposed a research model that highlights the links among the variables. In so doing, this paper makes some contributions to the literature in three ways. Firstly, it takes an integrative framework that may help to explain behaviors oriented towards maximizing potential performance within a context in which pro-organizational attitudes co-exist with self-serving motivations. Secondly, it advances the understanding of corporate governance mechanisms in small family businesses, and finally, it deepens the discussion of prior research by advancing a set of propositions based on two theoretical approaches. Thus, the authors believe that a systematic comparison of different contexts provides new insights into small family business governance. The implications and directions for future research are in the last section.展开更多
With the current development and progress of the socialist marketing economy, the number of the private enterprises in our country increases constantly, and the development scale has been expanded constantly, which ha...With the current development and progress of the socialist marketing economy, the number of the private enterprises in our country increases constantly, and the development scale has been expanded constantly, which has become an important component for China's national economy, and making a huge contribution to promote the increase of China's national economy. In order to occupy a development location among the fierce market competition and expand the market share, the private enterprises in our country make many efforts constantly, such as strengthening and promotion of the internal management concept and the management mode, etc., which really obtains an obvious achievement and progress, however, due to the restriction of the various reasons, there are still many realistic problems existing in the financial cost management for the private enterprises, which restricts the sustainable, modern and scientific development step greatly, for the method on improving the financial cost management level in China's private enterprises and the guarantee of the pertinence and the efficiency for the financial cost management measures to be implemented in the private enterprises, it becomes the key problems which needs to be solved by the private enterprises currently.展开更多
After the creation of the Law 9.394/96, which established the bases of Brazilian education, it is noted that government policies initiated at Fernando Henrique Cardoso (FHC) government reinforced the education decen...After the creation of the Law 9.394/96, which established the bases of Brazilian education, it is noted that government policies initiated at Fernando Henrique Cardoso (FHC) government reinforced the education decentralization process, combining higher education reform with state reform ruled by neoliberal policies. The literature about Higher Education contemporary problems points to three central themes: access to higher education, academic organization, and public universities privatization. Therefore, it is important to analyze the public space of relationship between state and civil society constituted for making decisions in this area because its deliberations directly affect public policy development. This paper aims to examine the capacity of Higher Education Chamber (CES) of the National Education Council (CNE) to consolidate civil society participation in decision-making issues concerning Higher Education in the period that includes 1997-2002, The CNE was selected because it is the highest forum for participation: it discusses the problems involved in national education, especially in higher education, whose decisions are taken by CES. The period 1997-2002 was defined because it is the period of President FHC government, after the creation of Law 9.394/96. The official documents and Council documents analysis showed that this public space consolidates the participation because there is an educational process of recognition of civil society issues, although there are restrictions imposed by the government.展开更多
Social forestry has emerged as a popular approach to achieving landscape justice by empowering local communities.However,the development and implementation of such programs often face challenges.This paper explores th...Social forestry has emerged as a popular approach to achieving landscape justice by empowering local communities.However,the development and implementation of such programs often face challenges.This paper explores the concept of landscape justice within the context of Indonesian social forestry in two ways.First,it juxtaposes the social forestry program with palm oil plantations to highlight the relationship between environmental initiatives and capital expansion,and the formation of green capitalism.By examining the historical development of social forestry,the paper argues that current political and legal frameworks have facilitated the depoliticization of previously radical,anti-capitalist,and anti-palm oil civil movements,despite notionally“empowering”local communities.Second,the paper interrogates the inclusivity of the social forestry program within local communities,noting that NGOs sometimes label local people as“cooperative”or“stubborn,”thus overlooking the pre-existing social tensions.The paper posits that more attention should be given to the social foundations underlying environmental projects and the new eco-social structure arising from environmental governance.展开更多
Authentication is the basis of the security of IEEE 802.11i standard. The authentication process in 802.11i involves two important protocols: a 4-way handshake and a group key handshake. A formal analysis of authenti...Authentication is the basis of the security of IEEE 802.11i standard. The authentication process in 802.11i involves two important protocols: a 4-way handshake and a group key handshake. A formal analysis of authentication in 802.11i is given via a belief multisets formalism. The analysis shows that the 4-way handshake and the group key handshake may provide satisfactory mutual authentication, key management, and issue of a new group temporal key from an access point to a user device, under the guarantee of mutual possession of a confidential palrwise master key. The analysis also shows that there exists a denial of service attack in the 4-way handshake and some seeming redundancies are useful in the protocol implementation.展开更多
基金supported by the National Natural Science Foundation of China under Grant 61272519the Research Funds of Blockchain Joint Lab between BUPT and BCTthe joint Blockchain and Security Lab between BUPT and CAPSTONE
文摘Upon flaws of current blockchain platforms of heavyweight, large capacity of ledger, and time-consuming of synchronization of data, in this paper, we proposed a new paradigm of master-slave blockchain scheme(MSB) for pervasive computing that suitable for general PC, mobile device such as smart phones or PADs to participants in the working of mining and verification, in which we separated traditional blockchain model in 2 layer defined as master node layer and a series of slavery agents layer, then we proposed 2 approaches for partially computing model(PCM) and non-computing of model(NCM) in the MSB blockchain, Finally large amounts of simulations manifest the proposed master-slave blockchain scheme is feasible, extendible and suitable for pervasive computing especially in the 5 G generation environment, and can apply in the DRM-related applications.
基金supported by the Program for Changjiang Scholars and Innovative Research Team in University (IRT1078)the Key Program of NSFC-Guangdong Union Foundation (U1135002)+3 种基金the Major national S&T program(2012ZX03002003)the Fundamental Research Funds for the Central Universities(JY10000903001)the National Natural Sci ence Foundation of China (Grant No. 61363068, 61100233)the Natural Science Foundation of Shaanxi Province (Grant No. 2012JM8030, 2011JQ8003)
文摘In the harsh environment where n ode density is sparse, the slow-moving nodes cannot effectively utilize the encountering opportunities to realize the self-organized identity authentications, and do not have the chance to join the network routing. However, considering m ost of the communications in opportunistic networks are caused by forwarding operations, there is no need to establish the complete mutual authentications for each conversation. Accordingly, a novel trust management scheme is presented based on the information of behavior feedback, in order to complement the insufficiency of identity authentications. By utilizing the certificate chains based on social attributes, the mobile nodes build the local certificate graphs gradually to realize the web of "Identity Trust" relationship. Meanwhile, the successors generate Verified Feedback Packets for each positive behavior, and consequently the "Behavior Trust" relationship is formed for slow-moving nodes. Simulation result shows that, by implementing our trust scheme, the d elivery probability and trust reconstruction ratio can be effectively improved when there are large numbers of compromised nodes, and it means that our trust management scheme can efficiently explore and filter the trust nodes for secure forwarding in opportunistic networks.
文摘The theory of scientific management exerts a far-reaching influence in the history of management. This paper challenges some one-sided comments on Taylorism and emphasizes more on its cultural implication. By analyzing the key features and background of scientific management, we prove why it appeals to European avant-garde modernists. In the end I expose a forgotten cultural implication of this organizational theory by explaining scientific management' s "lost" aesthetic and make a conclusion.
文摘Since taking office, the Trump administration's anti-terrorism policy has become increasingly clear. Its anti-terrorism measures and its internal and external anti-terrorism policies have introduced new features that are distinct from those of the Obama administration. These include linking terrorism to Islam, violating traditional political correctness in order to enhance homeland security, sending large-scale troops to the Middle East, and delegating more authority to the US Defense Department and the Armed Forces. Trump's anti-terrorism policies have made obvious progress both at home and abroad. Along with the adjustment of its national security strategy, the status of the anti-terrorism policy in Trump's national security strategy and national defense strategy will decline.However, for the foreseeable future, anti-terrorism will remain an important issue for the Trump Administration, and in some circumstances,the investment for it may increase.
文摘Macbeth was wary when he heard the witches out. He deliberated. He dithered. And Lady Macbeth puckered his courage up to the hilt and egged him on to murder. Macbeth murdered. Then he balked. He hallucinated himself out of his wits. Then he went on a rampage to save his own skin. He destroyed in fear of being destroyed. Yet all he ended up doing is losing his peace, his composure, his wife, and finally, his life. The whole of Operation Kingship, if the author may so call the whole business of eliminating Duncan out of the way of the royal throne, failed miserably. Macbeth, on the lookout for power found himself terribly, fearfully beaten, crestfallen, devastated. The million-dollar question then is -what is it that went so very wrong in the whole process? Critics are often heard to cry his ambition--his "overvaulting ambition" down as his incorrigible hamartia. But living in the 21st century, one gets to hear that ambition is not bad after all--the higher the "ambi-horse" vaults, the higher the chances of success is. In this dissertation, the author proposes to analyze Macbeth's case from the perspective of management studies. This paper, more than setting forth a literary statement of Macbeth's predicament, aims at what management Gurus would love to call a candid SWOT (strength, weakness, opportunity, threat) and STEEPLED (social, technological, economic, educational, political, legal, environmental, and demographic factors) analysis of Macbeth's situation to find out where the shoe pinched, whether the whole project crashed because of inefficient leadership, or whether there was no leadership at all, whether organizational strategies were not properly formulated or whether the implementation capsized horribly, thereby making the whole business a rudderless wild goose chase. The discussion necessarily follows up with an insight into what Macbeth lacked as far as Maslow's Pyramid of Needs is concerned and what it could have been like, had it been rewritten with a corporate-friendly, management-savvy 21st century protagonist armed with well formulated action plans and stronger inter-personal skills, in the titular lead.
文摘Public economics is a science of studying government economic behaviors, and an interdiscipline of politics and economics. As China is at the primary stage of socialism and the development of various domestic causes is still in a period of exploration, it is very important for the reform of the socialist modernization to strengthen domestic administrative management. Society is the subject of national reform and development in the long run, and thus maintaining the stability of domestic social order is not only the prerequisite for the long-term survival and development of China, but also the key requirement of ensuring people to live and work in peace and contentment. This thesis, first of all, introduces the management concept of public economy and the necessity of government's involvement in supervising economy. And on the basis of these, the thesis put forward the direction of transforming government economic functions and several precautions that should be noticed in government economic behaviors.
文摘In this paper, we research on the higher education management mode of China and America based on the perspective of operation mechanism, separation of school and the government. As the thought of higher education management theory or a form, we jump out of the labyrinth of modernism manages view and the introduction of totally different from the modernist paradigm, from the angle of the theory research of postmodernism manages view. The paper is organized as the follows. In the first section, we generally introduce the basic concepts of higher education management and the relationship of the schools and government. Then, by comparing the pattern of the Chinese and the American, we analyze the difference in detail. Finally, we set up the prospect and the conclusion. In conclusion, our method combines the advantages of the American higher education management model which will be meaningful.
文摘The rise of the anirne subculture assembles the huge youth groups in the construction of the socialist core value system, and provides a new carrier and injected into the innovative dynamic. At the same time, their perverse behavior and exaggerated style of dress and the strange language constitute the alienation and challenges of a core value system. It should strengthen the ideological review and classification management, with the criticism of the mainstream media to enhance the vigilance of the community, as well as through commercial activities to digest rebel style, which is the effective way to promote the core value system.
文摘This article is about the methods and techniques used in the building "retrofit" in modernist style designed by the architect Affonso Eduardo Reidy in the fifties, and also about the project of the new Rio de Janeiro MIS (Museum of Image and Sound), under construction, by The North-American office Diller Scofidio + Renfro, both located in the city of Rio de Janeiro. These constructions present a wide view of the concept of sustainability, not commonly used in public buildings in Brazil. In the building designed by Reidy, which belongs to the State of Rio de Janeiro, the regeneration to host the new headquarters of the State Department of Taxation and Finance respected its original characteristics and used smart and sustainable design techniques, as well as recyclable materials. On the other hand, the project of the new museum at Copacabana Beach was entirely planned on sustainable bases and it includes the application of building techniques concerning that purpose. This article presents a study of these two cases and evaluates the techniques and materials used in one another. Observing the principles of sustainability in construction is a pioneering initiative of the State Government. This article aims at making the scientific community aware of the needs of immediate adoption of sustainability techniques in Civil Engineering, not only in the construction of new buildings, but also in the regeneration of the existing ones, as well as the need of imperious adoption of sustainable techniques when it comes to maintainability.
文摘The aim of this study is to examine the effects of family involvement and altruism on agency costs of equity and debt, as well on the performance of small family businesses. To achieve this objective, the authors reviewed the literature on family business. Drawing from agency theory and stewardship theory, the authors also proposed a research model that highlights the links among the variables. In so doing, this paper makes some contributions to the literature in three ways. Firstly, it takes an integrative framework that may help to explain behaviors oriented towards maximizing potential performance within a context in which pro-organizational attitudes co-exist with self-serving motivations. Secondly, it advances the understanding of corporate governance mechanisms in small family businesses, and finally, it deepens the discussion of prior research by advancing a set of propositions based on two theoretical approaches. Thus, the authors believe that a systematic comparison of different contexts provides new insights into small family business governance. The implications and directions for future research are in the last section.
文摘With the current development and progress of the socialist marketing economy, the number of the private enterprises in our country increases constantly, and the development scale has been expanded constantly, which has become an important component for China's national economy, and making a huge contribution to promote the increase of China's national economy. In order to occupy a development location among the fierce market competition and expand the market share, the private enterprises in our country make many efforts constantly, such as strengthening and promotion of the internal management concept and the management mode, etc., which really obtains an obvious achievement and progress, however, due to the restriction of the various reasons, there are still many realistic problems existing in the financial cost management for the private enterprises, which restricts the sustainable, modern and scientific development step greatly, for the method on improving the financial cost management level in China's private enterprises and the guarantee of the pertinence and the efficiency for the financial cost management measures to be implemented in the private enterprises, it becomes the key problems which needs to be solved by the private enterprises currently.
文摘After the creation of the Law 9.394/96, which established the bases of Brazilian education, it is noted that government policies initiated at Fernando Henrique Cardoso (FHC) government reinforced the education decentralization process, combining higher education reform with state reform ruled by neoliberal policies. The literature about Higher Education contemporary problems points to three central themes: access to higher education, academic organization, and public universities privatization. Therefore, it is important to analyze the public space of relationship between state and civil society constituted for making decisions in this area because its deliberations directly affect public policy development. This paper aims to examine the capacity of Higher Education Chamber (CES) of the National Education Council (CNE) to consolidate civil society participation in decision-making issues concerning Higher Education in the period that includes 1997-2002, The CNE was selected because it is the highest forum for participation: it discusses the problems involved in national education, especially in higher education, whose decisions are taken by CES. The period 1997-2002 was defined because it is the period of President FHC government, after the creation of Law 9.394/96. The official documents and Council documents analysis showed that this public space consolidates the participation because there is an educational process of recognition of civil society issues, although there are restrictions imposed by the government.
文摘Social forestry has emerged as a popular approach to achieving landscape justice by empowering local communities.However,the development and implementation of such programs often face challenges.This paper explores the concept of landscape justice within the context of Indonesian social forestry in two ways.First,it juxtaposes the social forestry program with palm oil plantations to highlight the relationship between environmental initiatives and capital expansion,and the formation of green capitalism.By examining the historical development of social forestry,the paper argues that current political and legal frameworks have facilitated the depoliticization of previously radical,anti-capitalist,and anti-palm oil civil movements,despite notionally“empowering”local communities.Second,the paper interrogates the inclusivity of the social forestry program within local communities,noting that NGOs sometimes label local people as“cooperative”or“stubborn,”thus overlooking the pre-existing social tensions.The paper posits that more attention should be given to the social foundations underlying environmental projects and the new eco-social structure arising from environmental governance.
基金the National High Technology Research and Development Program(863)of China(No.2006AA01Z422)the National Natural Science Foundation of China(Nos.60573030,90704004)
文摘Authentication is the basis of the security of IEEE 802.11i standard. The authentication process in 802.11i involves two important protocols: a 4-way handshake and a group key handshake. A formal analysis of authentication in 802.11i is given via a belief multisets formalism. The analysis shows that the 4-way handshake and the group key handshake may provide satisfactory mutual authentication, key management, and issue of a new group temporal key from an access point to a user device, under the guarantee of mutual possession of a confidential palrwise master key. The analysis also shows that there exists a denial of service attack in the 4-way handshake and some seeming redundancies are useful in the protocol implementation.