A mutual information-based non-rigid medical image registration algorithm is presented. An approximate function of Hanning windowed sinc is used as kernel function of partial volume (PV) interpolation to estimate the ...A mutual information-based non-rigid medical image registration algorithm is presented. An approximate function of Hanning windowed sinc is used as kernel function of partial volume (PV) interpolation to estimate the joint histogram, which is the key to calculating the mutual information. And a new method is proposed to compute the gradient of mutual information with respect to the model parameters. The transformation of object is modeled by a free-form deformation (FFD) based on B-splines. The experiments on 3D synthetic and real image data show that the algorithm can converge at the global optimum and restrain the emergency of local extreme.展开更多
This paper proposed a two-tier location management mechanism （TTLM） by improving the current registration mechanism （CR） in IP Multimedia Subsystem （IMS）. The TTLM includes the visited network registration and t...This paper proposed a two-tier location management mechanism （TTLM） by improving the current registration mechanism （CR） in IP Multimedia Subsystem （IMS）. The TTLM includes the visited network registration and the home network registration, in which the visited network registration is responsible for re-registration in IMS. When subscriber roams, the location information of home network will be updated by the visited network based on the change of user equipment （UE）＇ s IP address. Thereibre the TTLM can reduce the times of IMS registration signaling. Using the proposed analytical model, the performance of the CR and the proposed TTLM were investigated. After the performance analysis of CR and TTLM by using proposed analytical model, the cost of CR in IMS could significantly be reduced theoretically and also was proven by simulation experiments.展开更多
Ownership structure is one of the most important and basic corporate governance characteristics. Thus, does the ownership structure of a firm have an effect on the type of audit opinion it receives from CPA？ This pap...Ownership structure is one of the most important and basic corporate governance characteristics. Thus, does the ownership structure of a firm have an effect on the type of audit opinion it receives from CPA？ This paper uses a sample including 1246 non-financial listed companies from China A-share market in 2003. Empirical results show： for listed firms, external auditor＇s propensity to qualify is lower with lower proportion of public shares, or with higher concentration of shares at a marginal significant level. However, the proportions of state-owned shares and institutional shares have no significant effects on audit opinions. A possible explanation is that the ownership structure influences risk awareness and negotiation power of audit firms, influences negotiation power of clients, and then ultimately influences auditors＇ reporting decision and audit opinions. The potential policy implication is： a more dispersed ownership structure and/or a higher proportion of public shares are preferable for higher audit reporting conservatism and audit quality in China.展开更多
＂Independent Audit basic norms＂ pointed out independent audit is the CPA entrusted by law, to be conduct an independent review of the accounting statements and related information and issue the audit opinion.＂ In t...＂Independent Audit basic norms＂ pointed out independent audit is the CPA entrusted by law, to be conduct an independent review of the accounting statements and related information and issue the audit opinion.＂ In the stock market, an independent audit is an important means to achieve fair presentation of financial statements by SFC-authorized accounting firm to conduct an independent audit of listed companies. In the open accounting services market, the independent audit is the most occupied audit resources, the most important business, and therefore the business is also subject to severe supervision of the SFC. Its value lies in perform forensic of the financial statements information of listed companies, and the higher the quality, the more it can reduce the risk of material misstatement of the financial statements, which is the need to strengthen and improve audit quality. Our independent audit market originated in the 1980s, along with the reform and opening up, China＇s economy is experiencing rapid growth, the demand for high quality audit increasingly enhanced. Audit activities have the nature of external and information asymmetry. External audit refers to it have an impact to investors, government departments and the other public stakeholders. Information asymmetry refers to the information asymmetry between the auditor and the audited entity, but due to the presence of asymmetric information and other reasons, the interests of stakeholders will be hurt by false information Government regulation as a model audit industry control, either in foreign or domestic, have played an irreplaceable role, especially in the socialism of China, plays a leading role. For example, when Enron bankruptcy United States speedly issue SOX in 2002 to strengthen the role of government regulation, effectively preventing the conspiracy of the CPA and the audited entity and improve audit quality. Visiblely, the role of government regulation in the audit market is very important.展开更多
This paper introduces an efficient holistic approach to the design optimization of lightweight structures of braided fiber-reinforced plastic material. The approach aims to mitigate the paradox of making design decisi...This paper introduces an efficient holistic approach to the design optimization of lightweight structures of braided fiber-reinforced plastic material. The approach aims to mitigate the paradox of making design decisions at early development phases, when necessary information is incomplete or lacking detail so as to properly make these decisions. However, expert knowledge is available and though it is imprecise in nature, it can compensate to create useful models. Manufacturing effort for the braiding process has been described by information accumulated via interviews with braiding experts. This information is then modelled using the soft-computing approach by fuzzy-rule-based systems. The resulting models can further be efficiently integrated into the structural design optimization process. A multidisciplinary design optimization is facilitated considering several aspects including manufacturing effort and structural mechanics, which can be used in early design phases leading to more holistic designing and, thereby, unlocking lightweight and cost-reducing potentials. Benefits of this method, including viability and ease of implementation, are proven by investigations on two academic test problems before advancing to the challenging automotive engineering design problem of the roadster A-pillar.展开更多
This paper provides an overview of the degradation in CANDU^a （Canadian Deuterium Uranium） feeders in operating plants observed from the mid 1990s onward. The degradation has been dominated by feeder wall thinning, ...This paper provides an overview of the degradation in CANDU^a （Canadian Deuterium Uranium） feeders in operating plants observed from the mid 1990s onward. The degradation has been dominated by feeder wall thinning, caused by FAC （flow accelerated corrosion） and feeder cracking. This paper summarizes the industry＇s response to the discovery of these two degradation mechanisms and the methodologies, tools and technologies developed to monitor the degradation and assess the continued fitness for service to manage the plant life. This paper identifies some of the lessons gained from more than a decade of industry effort, and discusses how these lessons are being implemented in the refurbished and new CANDU plants. CANDU^a is a registered trademark of Atomic Energy of Canada Limited.展开更多
If B is a p-block of a finite group G with a minimal nonabelian defect group D (p is an odd prime number) and (D, b D ) is a Sylow B-subpair of G, then N G (D, b D ) controls B-fusion of G in most cases. This result i...If B is a p-block of a finite group G with a minimal nonabelian defect group D (p is an odd prime number) and (D, b D ) is a Sylow B-subpair of G, then N G (D, b D ) controls B-fusion of G in most cases. This result is of great importance, because we can use it to obtain a complete set of representatives of G-conjugate classes of B-subsections and to calculate the number of ordinary irreducible characters in B. This result is key to the calculation of the structure invariants of the block with a minimal nonablian defect group. On the other hand, we improve Brauer's famous formula k(B) =Σ (ω,b ω ) l(b ω ),where (ω, b ω ) ∈ [(G : sp(B))]. Let p be any prime number, B be a p-block of a finite group G and (D, b D ) be a Sylow B-subpair of G. H is a subgroup of N G (D, b D ) satisfying N G (R, b R ) = N H (R, b R )C G (R), (R, b R ) ∈ A 0 (D, b D ), N G ( w , b w' ) = N H ( w , b w' )C G (w' ), (w' , b w' ) ∈ (D, b D ). If w 1 , . . . , w l is a complete set of representatives of H-conjugate classes of D, then (w 1 , b w 1 ), . . . , (w l , b w l ) is a complete set of representatives of G-conjugate classes of B-subsections in G. In particular, we have k(B) =Σ l j=1 l(b w j ).展开更多
基金Supported bythe National Basic Research Programof China ("973"Program) (No2003CB716103)Key Project of Shanghai Scienceand Technology Committee(No05DZ19509)
文摘A mutual information-based non-rigid medical image registration algorithm is presented. An approximate function of Hanning windowed sinc is used as kernel function of partial volume (PV) interpolation to estimate the joint histogram, which is the key to calculating the mutual information. And a new method is proposed to compute the gradient of mutual information with respect to the model parameters. The transformation of object is modeled by a free-form deformation (FFD) based on B-splines. The experiments on 3D synthetic and real image data show that the algorithm can converge at the global optimum and restrain the emergency of local extreme.
基金Supported by National Science Fund for Distinguished Young Scholars (No. 60525110 )National Basic Research Program of China (No.2007CB307100, 2007CB307103)+1 种基金Program for New Century Excellent Talents in University (No. NCET-04-0111 )Development Fund Project for Electronic and Information Industry (Mobile Service and Application System Based on 3G)
文摘This paper proposed a two-tier location management mechanism （TTLM） by improving the current registration mechanism （CR） in IP Multimedia Subsystem （IMS）. The TTLM includes the visited network registration and the home network registration, in which the visited network registration is responsible for re-registration in IMS. When subscriber roams, the location information of home network will be updated by the visited network based on the change of user equipment （UE）＇ s IP address. Thereibre the TTLM can reduce the times of IMS registration signaling. Using the proposed analytical model, the performance of the CR and the proposed TTLM were investigated. After the performance analysis of CR and TTLM by using proposed analytical model, the cost of CR in IMS could significantly be reduced theoretically and also was proven by simulation experiments.
文摘Ownership structure is one of the most important and basic corporate governance characteristics. Thus, does the ownership structure of a firm have an effect on the type of audit opinion it receives from CPA？ This paper uses a sample including 1246 non-financial listed companies from China A-share market in 2003. Empirical results show： for listed firms, external auditor＇s propensity to qualify is lower with lower proportion of public shares, or with higher concentration of shares at a marginal significant level. However, the proportions of state-owned shares and institutional shares have no significant effects on audit opinions. A possible explanation is that the ownership structure influences risk awareness and negotiation power of audit firms, influences negotiation power of clients, and then ultimately influences auditors＇ reporting decision and audit opinions. The potential policy implication is： a more dispersed ownership structure and/or a higher proportion of public shares are preferable for higher audit reporting conservatism and audit quality in China.
文摘＂Independent Audit basic norms＂ pointed out independent audit is the CPA entrusted by law, to be conduct an independent review of the accounting statements and related information and issue the audit opinion.＂ In the stock market, an independent audit is an important means to achieve fair presentation of financial statements by SFC-authorized accounting firm to conduct an independent audit of listed companies. In the open accounting services market, the independent audit is the most occupied audit resources, the most important business, and therefore the business is also subject to severe supervision of the SFC. Its value lies in perform forensic of the financial statements information of listed companies, and the higher the quality, the more it can reduce the risk of material misstatement of the financial statements, which is the need to strengthen and improve audit quality. Our independent audit market originated in the 1980s, along with the reform and opening up, China＇s economy is experiencing rapid growth, the demand for high quality audit increasingly enhanced. Audit activities have the nature of external and information asymmetry. External audit refers to it have an impact to investors, government departments and the other public stakeholders. Information asymmetry refers to the information asymmetry between the auditor and the audited entity, but due to the presence of asymmetric information and other reasons, the interests of stakeholders will be hurt by false information Government regulation as a model audit industry control, either in foreign or domestic, have played an irreplaceable role, especially in the socialism of China, plays a leading role. For example, when Enron bankruptcy United States speedly issue SOX in 2002 to strengthen the role of government regulation, effectively preventing the conspiracy of the CPA and the audited entity and improve audit quality. Visiblely, the role of government regulation in the audit market is very important.
文摘This paper introduces an efficient holistic approach to the design optimization of lightweight structures of braided fiber-reinforced plastic material. The approach aims to mitigate the paradox of making design decisions at early development phases, when necessary information is incomplete or lacking detail so as to properly make these decisions. However, expert knowledge is available and though it is imprecise in nature, it can compensate to create useful models. Manufacturing effort for the braiding process has been described by information accumulated via interviews with braiding experts. This information is then modelled using the soft-computing approach by fuzzy-rule-based systems. The resulting models can further be efficiently integrated into the structural design optimization process. A multidisciplinary design optimization is facilitated considering several aspects including manufacturing effort and structural mechanics, which can be used in early design phases leading to more holistic designing and, thereby, unlocking lightweight and cost-reducing potentials. Benefits of this method, including viability and ease of implementation, are proven by investigations on two academic test problems before advancing to the challenging automotive engineering design problem of the roadster A-pillar.
文摘This paper provides an overview of the degradation in CANDU^a （Canadian Deuterium Uranium） feeders in operating plants observed from the mid 1990s onward. The degradation has been dominated by feeder wall thinning, caused by FAC （flow accelerated corrosion） and feeder cracking. This paper summarizes the industry＇s response to the discovery of these two degradation mechanisms and the methodologies, tools and technologies developed to monitor the degradation and assess the continued fitness for service to manage the plant life. This paper identifies some of the lessons gained from more than a decade of industry effort, and discusses how these lessons are being implemented in the refurbished and new CANDU plants. CANDU^a is a registered trademark of Atomic Energy of Canada Limited.
文摘If B is a p-block of a finite group G with a minimal nonabelian defect group D (p is an odd prime number) and (D, b D ) is a Sylow B-subpair of G, then N G (D, b D ) controls B-fusion of G in most cases. This result is of great importance, because we can use it to obtain a complete set of representatives of G-conjugate classes of B-subsections and to calculate the number of ordinary irreducible characters in B. This result is key to the calculation of the structure invariants of the block with a minimal nonablian defect group. On the other hand, we improve Brauer's famous formula k(B) =Σ (ω,b ω ) l(b ω ),where (ω, b ω ) ∈ [(G : sp(B))]. Let p be any prime number, B be a p-block of a finite group G and (D, b D ) be a Sylow B-subpair of G. H is a subgroup of N G (D, b D ) satisfying N G (R, b R ) = N H (R, b R )C G (R), (R, b R ) ∈ A 0 (D, b D ), N G ( w , b w' ) = N H ( w , b w' )C G (w' ), (w' , b w' ) ∈ (D, b D ). If w 1 , . . . , w l is a complete set of representatives of H-conjugate classes of D, then (w 1 , b w 1 ), . . . , (w l , b w l ) is a complete set of representatives of G-conjugate classes of B-subsections in G. In particular, we have k(B) =Σ l j=1 l(b w j ).
