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This paper aims to present a low-cost, edge-fed, windmill-shaped, notch-band eliminator, circular monopole antenna which is practically loaded with a complementary split ring resonator (CSRR) in the middle of the radiating conductor and also uses a partial ground to obtain wide-band performance.

To compensate for the reduced value of gain and reflection coefficient because of the full (complete) ground plane at the bottom of the substrate, the antenna is further loaded with a partial ground and a CSRR. The reduction in the length of ground near the feed line improves the impedance bandwidth, and introduced CSRR results in improved gain with an additional resonance spike. This results in a peak gain 3.895dBi at the designed frequency 2.45 GHz. The extending of three arms in the circular patch not only led to an increase of peak gain by 4.044dBi but also eliminated the notch band and improved the fractional bandwidth 1.65–2.92 GHz.

The work reports a –10dB bandwidth from 1.63 GHz to 2.91 GHz, which covers traditional coverage applications and new specific uses applications such as narrow LTE bands for future internet of things (NB-IoT) machine-to-machine communications 1.8/1.9/2.1/2.3/2.5/2.6 GHz, industry, automation and business-critical cases (2.1/2.3/2.6 GHz), industrial, society and medical applications such as Wi-MAX (3.5 GHz), Wi-Fi3 (2.45 GHz), GSM (1.9 GHz), public safety band, Bluetooth (2.40–2.485 GHz), Zigbee (2.40–2.48Ghz), industrial scientific medical (ISM) band (2.4–2.5 GHz), WCDMA (1.9, 2.1 GHz), 3 G (2.1 GHz), 4 G LTE (2.1–2.5 GHz) and other personal communication services applications. The estimated RLC electrical equivalent circuit is also presented at the end.

Because of full coverage of Bluetooth, Zigbee, WiFi3 and ISM band, the proposed fabricated antenna is suitable for low power, low data rate and wireless/wired short-range IoT-enabled medical applications.

The antenna is fabricated on a piece (66.4 mm × 66.4 mm × 1.6 mm) of low-cost low profile FR-4 epoxy substrate (0.54 λ_g × 0.54 λ_g) with a dielectric constant of 4.4, a loss tangent of 0.02 and a thickness of 1.6 mm. The antenna reflection coefficient, impedance and VSWR are tested on the Keysight technology (N9917A) vector network analyzer, and the radiation pattern is measured in an anechoic chamber.

The purpose of this paper is to present one type of the architecture for wireless sensor network and to discuss in detail the hardware design of the sink node which can be responsible for transmission data or instructions between sensor nodes and data. Finally, an experiment based on wireless sensor network has proved that the design of sink node is applicable and reliable in monitoring environmental elements such as temperature, humidity, etc.

A design for the sink node is presented which constants three parts: the power module, the storage/display module and the communication module. Zigbee, GPRS and Ethernet techniques are used on ARM7 microcontroller. The sink node is capable of bridging the user's terminal with sensor nodes for information transmission.

In this paper, a new method of the power management based on wireless sensor network is proposed to conserve energy. The antenna height is proven to be an important factor to the communicating among nodes. Finally, the paper proposes regular patterns of the deployment for sensor nodes based on the communication range and the sampling range.

The experiment for providing real‐time data on environment monitoring parameters indicates that the system is efficient. The authors believe that the idea and the design presented in the paper may help the research and application of wireless sensor network.

Monitoring the real-time temperature, humidity, and physical position status of goods is vital in the cold chain. Diverse logistics technologies and systems have been adopted in the cold chain for monitoring perishable goods. However, these technologies and systems are independent from each other. Data and information in them are not integrated so that information control is not effective. The paper aims to discuss these issues.

By integrating Internet of Things and tracking technologies, this paper proposes an intelligent tracking system, which is designed to achieve effective and fast live monitoring of goods in the cold chain at the lowest cost and with the largest network capacity and simplest protocols.

Structure and information platform design mechanism are introduced. The key part of this system is a wireless sensor network built on Zigbee. Wireless sensors located in cold storages or refrigerated trucks are able to collect and transmit live data quickly and efficiently.

Users of the proposed system can easily monitor goods transported in cold chains. In addition, the system assigns specific servers to save historical data for inquiries.

The authors seek to propose the notion of ubiquitous proximity e‐service for exploring collective wisdom in the ubiquitous environment. Ubiquitous proximity e‐service highlights the collective effort focused on collecting the user group's power as the reference for ubiquitous trust decisions.

This paper provides some theoretical utility support for ubiquitous proximity e‐service. The “homophily” describes the tendency of individuals to associate and bond with similar others. By highlighting the “homophily” of e‐service participants, these isolated individuals can be treated as a group with proximity. The main value of ubiquitous proximity e‐service utilizes the network effect from the collective effort of interpersonal social network.

In order to leap the trust barrier for users to embrace these ubiquitous e‐services, ubiquitous proximity e‐service makes it possible for users to collaborate with their nearby user groups to establish a reliable and trustworthy interaction environment. The simulation outcomes for trust decision quality enhancement show a significant improvement in a variety of environment settings.

A significant value of ubiquitous proximity e‐service lies in the increased possibility of establishing innovative social network relationships. From the interpersonal perspective, unfamiliar strangers can make connections with individuals who are proximal and homoplastic to them. The strength of proximity gives people better chances to make interpersonal connections, including both weak ties and strong ties. By combining those interpersonal tie relationships, ubiquitous proximity e‐service can easily cause information diffusion and effectively encourage collective wisdom.

The paper advocates the utility of ubiquitous proximity e‐service that can be realized in the e‐commerce environment and which enables information diffusion effectively.

This paper aims to critically review the progression of wireless technologies in tourism and hospitality since 2000. Wireless technologies are a set of information and communications technologies (ICTs) involving radio transmission (such as mobile or satellite technologies) that are extensively used in tourism and hospitality, but which have not yet been studied comprehensively.

This study is a mixed methods review combining a quantitative and qualitative approach and including a systematic review of the academic literature since 2000.

Contrary to the prevailing focus of study on mobile technologies, the authors open the field to other technologies (such as Zigbee or Bluetooth), and in a particular highlight, the large role played by satellite technology in tourism and how this is reflected in the literature. In literature reviews linking tourism and ICTs, the authors find that excluding some journals may leave out notable aspects for any systematic analysis. Moreover, the study highlights the importance of wireless technologies in a sensor-based convergence between the physical and digital worlds.

The contribution is mainly twofold: first, the authors develop the literature on tourism with a better understanding of the role played by these technologies in supporting tourism and hospitality, by updating sources and research work; second, the authors take a holistic, all-encompassing approach, providing a truly comprehensive view of the literature on tourism and ICTs, in which wireless technologies have always been approached with fragmented or limited scope, lacking a view in the round.

论无线科技在酒店和旅游业中的发展进程

摘要

本论文批判性评论了自2000年起无线科技在酒店和旅游业中的发展过程。无线科技是一组有关无线电传输的信息通信技术（ICTs）（如移动技术或者卫星技术)，这种技术在酒店旅游业中使用频繁，但是却没有得到全面的研究。

本论文采用混合方法，评论了自2000年来发表的定量和定性研究的文章。

比起大部分移动技术研究的文章，本论文延展了研究领域到其他技术（如Zigbee或蓝牙), 特别强调了卫星技术在旅游业的重大作用，以及文献中所研究的重点。在连接旅游业和ICTs的文献中, 我们发现一些期刊漏掉了很多系统分析的重要方面。此外，我们的研究还强调了无线科技在感应器为基础的物联网世界的重要性。

研究结果的贡献大致有两点：首先，我们更新了数据库和研究作品，展示了旅游相关文献，深入理解了这些科技是如何支撑旅游和酒店业的发展。第二，我们采用了整体全面的研究方法，提供旅游和ICTs有关的文献体系，而之前的文献往往对无线科技的研究是片面的或者不成体系。

关键词：无线科技、旅游业、酒店业、IoT、移动、卫星

Intelligent lighting control system can control lights to go off when people leave, which has been widely concerned by researchers.

In this study, an intelligent lighting control system based on wireless sensor network was designed. First, the hardware and software designs of the system were described briefly. Then, the lighting control algorithm was analyzed emphatically. Considering the illumination and uniformity of light, an intelligent lighting control algorithm based on gradient descent was designed.

In the system test, it was found that the system had a good through-wall communication function, and the communication distance could fully meet the system requirements and run normally. In the test of the lighting control algorithm, it was found that the user’s satisfaction on uniformity in different scenarios was close to 1, and the satisfaction on illumination could also meet the user’s needs, which verified the reliability of the lighting control algorithm.

This study provides some theoretical supports for the better application of wireless sensor network in intelligent light control system, which is conducive to the further development of light control system.

With the emerging technologies, collecting and processing data about the behaviors of customers or employees in a specific location has become possible. The purpose of this paper is to evaluate existing data collection technologies.

Technology evaluation problem is handled as a multi-criteria decision-making (MCDM) problem. In this manner, a decision model containing four criteria and eight sub-criteria and four alternatives are formed. The problem is solved using hesitant analytic hierarchy process (AHP) and trapezoidal fuzzy numbers (TrFN).

The results show that the most important sub-criteria are: accuracy, quantity, ıntrospective and cost. Decision makers’ evaluate for alternatives, namely wireless fidelity (WiFi), camera, radio-frequency identification and Bluetooth. The best alternative is found as Bluetooth which is followed by WiFi and Camera.

Technology evaluation problem, just like many other MCDM problems are solved using expert evaluations. Thus, the generalizability of the findings is low.

In this paper, technology selection problem has been handled using hesitant AHP for the first time. In addition, the original methodology is extended by using TrFN to represent the expert evaluations in a better way.

This paper considers where telecare services may be in 15 years time. It considers the role of various drivers including demographic demands and economic realities along with the emergence of new technologies such as Zigbee. The conclusion is that the influences are not entirely predictable because of the possibility of political interventions, and the changes in culture and values of the population in the future. It might therefore be necessary to create a model to interpret the impact of various factors including the environment.