A Stream Control Transmission Protocol Based OAM System of 3G Cellular Network

OAM （Operations, Administration and Maintenance） system is a very important component of 3G cellular network. In order to acquire overall management, fast response and steady operation, an SCTP （Stream Control Transmission Protocol） based OAM, i. e. , SOAM system was proposed. SOAM implements new characters of SCTP such as multi-stream, enforced SACK and heartbeat mechanism on its transport layer. These characters help SOAM decrease the message transmission delay and accelerate the link failure detection. Besides, a new component named SOAM agent was introduced to improve the operation efficiency of SOAM. The experimental results prove the proposed SOAM system achieves better performance on signaling transmission compared with conventional TCP based OAM system.     

Fuzzy C-Means Clustering Based Phonetic Tied-Mixture HMM in Speech Recognition

A fuzzy clustering analysis based phonetic tied-mixture HMM (FPTM) was presented to decrease parameter size and improve robustness of parameter training. FPTM was synthesized from state-tied HMMs by a modified fuzzy C-means clustering algorithm. Each Gaussian codebook of FPTM was built from Gaussian components within the same root node in phonetic decision tree. The experimental results on large vocabulary Mandarin speech recognition show that compared with conventional phonetic tied-mixture HMM and state-tied HMM with approximately the same number of Gaussian mixtures, FPTM achieves word error rate reductions by 4.84% and 13.02% respectively. Combining the two schemes of mixing weights pruning and Gaussian centers fuzzy merging, a significantly parameter size reduction was achieved with little impact on recognition accuracy.     

Improving Mobility Management for All-IP Radio Heterogeneous Network Using SCTP

IntroductionFuture mobile communication network willconsist of multiple traffics and access technologies.It is to certainty a radio heterogeneous network(RHN) because none of the current networks canprovide ubiquitous coverage and all-around ser-vices[1]. Future mobile terminal will be multi-modethat maintains connectivity to different radio accesspoints, so RHN should be scalable and support theevolution and upgrade of individual network ele-ments. All-IP architecture is an inevitable way…     

汽车钣金与涂装专业技能型课程教学模式在高技能人才培养中的实践与运用

制造业的高速发展对高技能人才提出了越来越大的需求，并对技能型人才培养模式提出更高要求。高技能人才培养中，必须积极创新教学模式，促进教学质量提升，同步重视理论知识传授与专业技能训练，以切实提升学生专业素养。据此，主要通过介绍技能型课程教学模式的概述，分析汽车钣金与涂装专业建立技能型课程教学模式的必要性，并提出具体的建设路径，为相关院校及专业强化高技能人才培养提供一定参考。