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关键词： dual-resonant   separating sensor   strain detection   CMPA   chipless RFID tag  

摘要： In the field of structural health detection, since the sensor needs to be directly bonded to the measured object, it is difficult to stably transmit the RFID information and realize the passive wireless structure strain detection. To circumvent these difficulties, this paper innovatively proposes a dual-resonant circular microstrip patch antenna (CMPA) sensor with chipless RFID tag. The information of the RFID tag can be changed that allows the sensor to be deployed on a large scale. The separating sensor includes chipless RFID tag layer and dual-resonant CMPA layer, which can simultaneously reflect RFID tag information and strain *** design of separated layers can minimize the resonant frequency shift of ID tags when stress is implemented on CMPA strain part. Current distribution analysis and equivalent circuit are used to study the strain size and direction. Experiments show that the offset of the resonant frequency of the sensor antenna has linear relationship with the lateral and longitudinal strains. The correlation coefficients are 0.9284 and 0.9235 respectively, and the sensitivity coefficient of the lateral and longitudinal strain is 528 MHz epsilon(-1) and 384 MHz epsilon(-1). At the same time, the readability of the RFID tag information is maintained.

关键词： Gray marketing   Parallel importation   RFID technology   Competitive intensity   Game theory  

摘要： With the global development of the e-commerce economy, gray marketing has increased sharply and caused significant impacts on manufacturers. Radio frequency identification (RFID) technology provides a new approach for gray marketing management. In this paper, we introduce RFID to track the distribution of products within the gray marketing in a competitive environment. Using a game-theoretical model, we investigate the interplay between the manufacturers' RFID adoption decisions and the third-party's gray marketing decisions and examine the impacts of competitive intensity on firms' profits and decisions. We observe that RFID narrows the scope of the third-party's gray marketing and competitive intensity plays an important role in influencing the third-party's gray marketing decisions. The third-party's gray marketing decisions depend on the RFID double effects (cost effect and punishment effect), market disparity, and competitive intensity. Despite the benefits of RFID, the manufacturer does not always adopt it. When the market disparity is sufficiently small, the manufacturer will not adopt RFID. When the market disparity is sufficiently large, the manufacturer will only adopt RFID if the RFID punishment effect is strong. We also find that increased competitive intensity decreases the third-party's incentive to engage in gray marketing. Finally, although gray marketing decreases the branded manufacturer's profits, it may also increase the competitor manufacturer's profits. Therefore, public policymakers should take into account the positive impacts of gray marketing on competitor manufacturers when they formulate policies to inhibit gray marketing. Public policies should be developed to promote the entire social welfare.

ISBN: (纸本)9787560658599

关键词： Breast augmentation   Breast implants   Breast pocket irrigation   RFID   Subfascial   Surgical scaffold   Hot topics breast surgery   New innovations breast surgery  

摘要： Although the concept behind implant-based breast augmentation today remains unchanged from when the procedure was first performed approximately 70 years ago, advancements in implant technology and surgical technique have evolved breast augmentation into a procedure that today no longer resembles those early efforts. Despite the popularity of breast augmentation, however, the craft has not yet been perfected;searching for ways to improve outcomes and minimize risk for patients continues. There is no doubt that the techniques and technologies discussed in this article will play a role in breast augmentation in the years to come, but only time will tell whether these innovations become fundamental pillars of the procedure or are lost to the annals of history.

关键词： Harmonic analysis   Impedance   Backscatter   Tunneling   Resistance   Voltage measurement   Power system harmonics   Backscatter radio   harmonic reflection amplifier (HRA)   RFID   self-interference   tunnel diode  

摘要： The highly power-efficient backscattering communication scheme holds solid potentials to lead the Internet of Things technologies. However, the asymmetric radio frontend architectures that ensure cheap and pervasive communicating things and tags at one end of the link, overburden the other end of the link ("reader") with complicated and expensive hardware. This turns out to prevent the integration of the technology in the wide spectrum of consumer electronic devices (e.g. RF smartphone platforms). By separating TX and RX frequency bands, the harmonic backscattering scheme drastically loosens the technological constraints toward integration. We propose here the use of a single tunnel diode to build a harmonic reflection amplifier (HRA), using the nonlinear behavior of the negative differential resistance region to both generate harmonics and amplify the signals. The circuit also behaves like a common backscatter, with the same-frequency backscattering modulation for operation with legacy readers. Operating below 150 mV, the HRA drains 144-mu W dc power with a measured positive conversion gain of 18 dB.

关键词： BCI   Brain-computer interface   Cybersecurity   Reader   RFID   Secure  

摘要： Brain Computer Interface BCI is a real-time communication system that connects the brain and external devices. The BCI system can directly convert the information sent by the brain into commands that can drive external devices and replace human limbs or language organs to achieve hu-man communication with the outside world and the external environment Control. In other words, the BCI system can replace the normal peripheral nerve and muscle tissue to achieve communication between the human and the computer or between the human and the external environment. The objective of this paper is to assist the network security for the BCI applications to identify brain activities in a secure real-time mode. To achieve this, we proposed the design of a Radio Frequency Identification RFID-based system having semi− active RFID tags placed outside the brain on the scalp transmit the collected brain activities wirelessly to a devise SC (Scanner Controller) consist of mini-reader and timer integrated together for every patient. Additionally, the paper implemented a novel system prototype interface called BCI Identification System (BCIIS) to assist the patient in the identification process. Given the benefits of RFID, we believed that if the idea is adopted and implemented by industry, it could enhance and provide secure BCI applications. © 2020

关键词： Anti-collision   Monte Carlo tree search   RFID   Tag identification   Query tree  

摘要： Tag collision is a pressing issue in radio frequency identification systems which significantly lowers the system performance if not mitigated carefully. This paper presents the Monte-Carlo Query Tree Search (MCQTS) method as a novel and fast anti-collision algorithm. This method combines the capabilities of the conventional Monte-Carlo Tree Search and Query Tree by applying a few heuristics on the tree traversal to raise the chance of facing the most promising states. The collision mitigation based on the MCQTS is presented and its performance in terms of time, and space (memory) complexity is analytically verified. Simulations are performed, and the effects of tree size, number of tags, and tag ID length on the performance of the proposed method are investigated. The results are compared to the previously presented tree-based algorithms, and it is shown that for typical tag lengths, the MCQTS method performs between 3.89% and 62.06% (in average) faster than the conventional methods for multi-tag identification.

关键词： RFID   IoT   synchronization   preamble   SFD  

摘要： Start of frame delimiter (SFD) is of critical importance for frame synchronization of packet communication systems. IEEE 802.15.4f defines the SFD as a 16-bit binary sequence and defines the preamble as a 16-bit alternating {+1,-1,..., +1,-1} sequence. In addition, direct current (DC) balance is important and always preferred in circuit design. With respect to the preamble and the DC balance constraints, in this letter, we study the performance bound of frame synchronization via SFD. We provide a mathematical modeling of SFD and show that for any SFD, the strongest side lobe yielded can never be less than 2, regardless of the lengths of the SFD and the preamble. As a special case of the more general case considered in this letter, the SFDs in 802.15.4f, achieves the performance bound for synchronization accuracy.

关键词： Radiofrequency identification (RFID)   Tumor localization   Gastric cancer   Colorectal cancer   Laparoscopic surgery  

摘要： Background We aimed to improve the tumor localization system using radiofrequency identification (RFID) technology used during laparoscopic surgery for gastric and colorectal cancer. To this end, we developed a detection algorithm and designed improvement for the RFID clip. Methods To evaluate the proposed system, a swine-based animal study was conducted, followed by experiments on porcine stomachs and colons using the EASIE-R simulator. The success rates of endoscopic clipping, detection time, and detection accuracy, which is the distance between the detection point and RFID tag, were measured. Results Results of the in vivo swine animal study showed success in all three clippings and detections of the RFID clips. Results of the 60 RFID endoclip attempts using the EASIE-R simulator showed a total clipping success rate of 85.0% (n = 51/60;stomach, 83.3%, n = 25/30;colon, 86.7%, n = 26/30). The median detection times were 29.2 s for the stomach and 25.5 s for the colon. The median detection accuracy was 4.0 mm for the stomach and 4.5 mm for the colon. Conclusions We confirmed that the proposed RFID-based system showed improvements over the system of a previous study. This RFID-based system is effective at localizing gastric and colorectal tumors.

关键词： Task-technology fit   Network externalities   RFID   Healthcare   Technology adoption  

摘要： Purpose - Despite the extensive adoption of radio-frequency identification (RFID) technology across many industry supply chains, the extent of adoption in healthcare is far behind the earlier expectation. The purpose of this study is to better understand the current RFID adoption in healthcare by looking beyond the existing body of work using both the task-technology fit (TTF) framework and network externalities theories. Design/methodology/approach - A survey is employed in this study, and the structural equation modeling (SEM) technique is used to test the hypotheses of the proposed model. Findings - The findings are twofold. First, both TTF and network externalities exert a positive impact on the RFID adoption in the healthcare sector;and second, no synergistic effect can be found between these two for further increasing the adoption. This is different from what the extant research found on other technology adoptions across various supply chains. Originality/value - This paper provides contributions to both researchers and practitioners. For researchers, this study enriches the body of knowledge of RFID adoption by being the first to apply the network externalities and TTF theories to predict the adoption of RFID in healthcare. For healthcare practitioners, to make the RFID adoption easier and more effective, any initial applications of RFID tools should be centered on those for which there is a more natural application. Further, for those who propose an RFID adoption should start with a product that has a sizable adoption community;this may help persuade senior management to make the adoption decision.