Analysis and improvement of authenticatable ring signcryption scheme

We show that the Zhang-Yang-Zhu-Zhang identity-based authenticatable ring signcryption scheme is not secure against chosen plaintext attacks.Furthermore, we propose an improved scheme that remedies the weakness of the Zhang-Yang-Zhu-Zhang scheme.The improved scheme has shorter ciphertext size than the Zhang-Yang-Zhu-Zhang scheme.We then prove that the improved scheme satisfies confidentiality, unforgeability, anonymity and authenticatability.     

Dynamic process model of mass effects on travel demand

Whereas transportation planners commonly predict the negative impacts of mass transportation, there is increasing empirical evidence of the existence of positive mass effects, whereby increased use of a mode by the ‘mass’ will generally increase its attractiveness for future travellers. In this paper we consider the dynamic impact of such an effect on the problem of travel demand forecasting, with particular regards to social network effects. Our proposed modelling approach is inspired by literature from social physics, evolutionary game theory and marketing. For simplicity of exposition, our model is specified for a scenario in which (a) there is a binary choice between two mobility lifestyles, referred to as car-oriented and transit-oriented, and (b) there are two population groups, where one is the “leading” or “innovative” population group and the other the “following” or “imitating” population group. This latter distinction follows the rather well-known Bass model from the marketing literature (1969). We develop the transition probabilities and transition dynamics. We illustrate with a numerical case study that despite lower intrinsic utility for the transit lifestyle, significant changes towards this lifestyle can be achieved by considering congestion, service improvements and mass effects. We further illustrate that mass effects can be positive or negative. In all cases we explore the sensitivity of our conclusions to the assumed parameter values.     

IDENTIFICATION OF HUMAN MURR1, THE HOMOLOGUE OF MOUSE IMPRINTED Murr1 GENE

Different fromthe biallelic expression mannerof most common autosomal genes,i mprinting is aspecial genomic expression phenomenon,of whichthe i mprinted genes show parental-specific expres-sion only according to their parental origin[1].Cor-rect i mprintingis i mportant inthe nor mal embryon-ic development,postnatal growth,as well as behav-ior of ani mals.Dysregulation of i mprinting hasbeen i mplicated in the pathogenesis of congenitaldiseases and cancer[2-3].To date,78kinds of mousei mprinte…     

用于铝合金车体外壳焊缝的疲劳设计图

为了开发疲劳强度设计图,作者对铝合金车体外壳焊缝进行疲劳试验。选用组成双层外壳的中空挤压型材焊缝和2种单层外壳补强焊缝作为车体外壳焊缝,通过对小尺寸和全尺寸试样的疲劳试验获得S-N曲线,采用统计处理方式,得出用于中空挤压型材焊缝的疲劳设计图。同样,用全尺寸试样开发了2种单层外壳补强焊缝通用的疲劳设计图。该图适用于评估焊缝附近材料应力范围内的疲劳强度。     

妇科肿瘤组织中端粒酶活性的检测

为明确妇科肿瘤中端粒酶的活性，探索端粒酶活化在妇科肿瘤形成中的作用，应用以ＰＣＲ为基础的端粒酶测定方法（ＴＲＡＰ）对７８例妇科肿瘤和对照组织标本进行端粒酶活性测定。结果表明，端粒酶活性在子宫颈癌、卵巢癌和子宫内膜癌标本中阳性率为９１％（３０／３３）；子宫肌瘤、卵巢良性肿瘤和宫颈湿疣等良性增生病变中阳性率为１５％（３／２０）；正常对照组全部阴性。恶性肿瘤组阳性率明显高于后两组（Ｐ＜０．００５）。提示端粒酶活化是妇科恶性肿瘤中的普遍现象，在妇科肿瘤形成中有重要作用。     

Energy Flow Method for the Study of Motorcycle Wobble Mode

A concept of the energy flow is introduced in order to study the motorcycle wobble mode. The activation mechanism of the wobble oscillation is made clear in the framework of the energy flow concept It is found that the wobble mode is activated mainly by the yaw rate and roll rate motion and is suppressed by the lateral acceleration and the force of the front time. A designing guide to stabilize the wobble mode is mentioned.