The rapid increase in the complexity and the extent of personalization of services in the Internet of Things (IoT) has led to a greater demand for frequent collaboration among heterogeneous devices. Moreover, with the inseparable relations between human and devices, the paradigm of Social IoT (SIoT) is gaining popularity in recent years. How to effectively facilitate the access to quality services and credible devices in largescale networks via defining, establishing, and managing social architectures among things has become a critical issue. In this paper, a scheme of access service recommendation for the SIoT is presented with the understanding of inherent constraints and factors that influence the security and stability of IoT networks. In which, timeliness properties are considered in each transaction for dynamic performance enhancements. With the benefits of promoting service discovery and composition, social relationships among things are introduced in the proposed scheme. An energy-aware mechanism is also utilized as a restrictive factor in trustworthiness evaluation. Finally, the recommendation is based not only on the past performance but also on the social relationship and the energy status of nodes. Simulation experiments demonstrate the effectiveness and benefits of our scheme from three aspects including rating accuracy, dynamic behavior, and network stability.where the weight parameter γ ∈[0, 1]. According to (9), the judgment of a given node u's energy status is based on its remaining energy RE(v,t) and the energy consumption rate, which is reflected by 699 A SCHEME OF ACCESS SERVICE RECOMMENDATION FOR THE SIOT

Featured by diverse formats, sources, platforms and mathematical bases, the land resources data belong to a typical heterogeneous data warehouse. It is very important to establish the organizational model for land and resources management and supervision of resources. After thoroughly analyzing the characteristics of land resources data, this paper puts forward the establishment of "One Map" organizational model for land resources data used in supervision and service in four principles, that is, "comprehensiveness, integrity, sharing, timeliness" to analyze the characteristics of update and sharing relationship between the "One Map" database with Business Database, Monitoring Database and Index Database. Taking Chengdu city as an example, the ETL and data update management technology are employed to construct the initial "One Map" database and realize its update management. In this way, "One Map" comprehensive database is constructed with the full coverage of space, business and sector, which have covered more than two kinds and 51 items of land and resources data. In addition, these have covered 160 key elements, more than 90 million records and up to 3TB data so as to provide the data support and information service for analysis of land and resources management and supervision of resources.

This paper presents a supply chain collaboration service (SCCS) in SaaS paradigm to support inter-organization interaction between business partners. SaaS is very attractive to enterprises because it offers low cost and flexible on-demand IT solution. The paper presents an extensible service oriented architecture that can integrate business application as a service into SCCS. In order to improve the supply chain performance, it provides flexible support for information sharing between business partners. The SCCS prototype has been developed.

Linear asymmetrical poly(propylene oxide) was synthesized through four-step reactions: selective benzylation, alcohol exchange reaction, propylene oxide anionic polymerization, debenzylation. One terminal of the asymmetrical polymer chains is alcohol hydroxyl and the other is phenol hydroxyl. It was characterized with infrared (IR) and 1 H Nuclear Magnetic Resonance ( 1 H-NMR). Peaks at 1.11, 3.38, and 3.53 ppm were attributed to side groups (AOCH 2 CH(CH 3 )A), backbone units (AOCH 2 CH (CH 3 )A) and (AOCH 2 CH(CH 3 )A) of poly(propylene oxide), respectively. Molecular weight and molecular weight distribution were measured with 1 H-NMR and laser light scattering (LLS), which showed that the linear asymmetrical poly(propylene oxide) was mono-disperse (PDI ¼ 1.02-1.07). Then, its carbamate reaction with phenyl isocyanate was studied; the reaction rate constants for phenol hydroxyl and alcohol hydroxyl of poly(propylene oxide) were k 1 ¼ 0.209 mol L À1 min À1 and k 2 ¼ 0.051 mol L À1 min À1 . There was a great reactivity difference for two types of hydroxyls in asymmetrical poly(propylene oxide), contrasting to the single carbamate reaction rate constant of symmetrical poly(propylene oxide) (k 3 ¼ 0.049 mol L À1 min À1 ).