Jiangxi University of Finance and Economics

About: Jiangxi University of Finance and Economics is a education organization based out in Nanchang, China. It is known for research contribution in the topics: Fuzzy logic & China. The organization has 2865 authors who have published 3556 publications receiving 41567 citations.

Security evaluation of bilateral-diffusion based image encryption algorithm

Abstract: Recently, a novel bilateral-diffusion image encryption algorithm based on dynamical compound chaos function and LFSR was proposed. The core idea of the algorithm is to introduce the bilateral-diffusion approach. The present paper focuses mainly on security evaluation of this approach. As it is well known, the security of a cryptosystem must depend only on the secrecy of the key rather than the secrecy of the algorithm according to Kerckoff’s principle. The security of the original algorithm is determined by two initial keys. Since the keys are fixed, the chaotic keystream keeps unchanged for different images. Thus, our purpose is to reveal the keystream. The cryptanalytic results show that the whole keystream can be broken by using two images including a chosen image and a known image, with a combination of chosen-plaintext attack and known-plaintext attack.

Lean Precast Production System based on the CONWIP Method

Abstract: To enhance the level of precast production management, and to reduce the costs of precast production, a lean precast production system is developed based on the constant work-in-process (CONWIP) method. Then the performance of this system is verified using the Discrete Event Simulation (DES). A quantitative performance evaluation between the lean precast production system and the current precast production process is provided using the JaamSim simulation platform. Cases and site visits to precast concrete plant in China are combined to collect the production procedures and initial parameters involved in precast production. Through simulations, Non-value Adding (NVA) activities, as well as bottleneck workstations, are identified in precast production. The optimal number of cards to be used in the lean precast production system is also presented. Our simulation experiments show that the lean precast production system provides an effective way to control queue length and shorten the WIP and cycle time, while also maintaining throughput and saving 25.4% of labour cost.

SaaS business model for software enterprise

Abstract: Revenue of traditional software enterprises are from software copyright licensing and software upgrades, maintenance and other services fees. As a rapidly growing operation model of software contrast to traditional perpetual-use license, SaaS (Software as a Service) softwares are subscripted by users from vendors. From views of business and technique, software product/service selection, software service classification, service pattern and charges, advantages and disadvantages of SaaS business model were analyzed in the paper. A conclusion is that SaaS business model could not only provide vendors more development opportunities but also contribute to SME's informationization.

Political uncertainty and allocation of decision rights among business groups: evidence from the replacement of municipal officials

Abstract: A firm trades off information transfer costs and agency costs to determine the distribution of decision rights to lower-level management Using the replacement of municipal officials as an exogenous shock of political uncertainty, we find a business group is more likely to delegate decision rights of cash resources to subsidiaries when political uncertainty is high The association is only evident among non-state-owned-enterprises (non-SOEs) and not SOEs Additional tests show that the delegation of decision rights is more pronounced among firms with weak internal control and those located in cities where local governments have replaced their party secretary We also find that firm decentralization can enhance investment efficiency and the marginal value of cash in the presence of high political uncertainty Overall, our findings support the decentralization theory, and provide causal evidence on how political uncertainty influences allocation of decision rights among listed firms in an emerging economy with large state ownership