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Abstract-This work presents a wireless system that operates in the 2.4 GHz ISM band for concurrently sensing the vital signs and positions of multiple individuals. Characterized by low complexity and high accuracy, the proposed system consists of two main parts. One is a self-injection-locked (SIL) tag carried by a subject, which emits a sinusoidal frequency-modulated (SFM) signal with vital sign information. The other is a group of injection-locked (IL) I/Q receivers, which performs arctangent demodulation of the SFM signal to obtain the position information without using RF reference signals, and simultaneously extracts the vital sign information of the subject. In the experiment, the system is capable of sensing multiple individuals based on frequency division multiple access (FDMA) technique. Moreover, fidgeting effect on the detection of vital signs has been greatly reduced by a spectral product approach. Accordingly, it is demonstrated that the experimental prototype provides accurate information about the vital signs and positions of different individuals in an indoor environment.Index Terms-Arctangent demodulation, injection-locked (IL) I/Q receiver, self-injection-locked (SIL) tag, vital sign detection, wireless indoor positioning.

The purpose of this work was to add n‐3 polyunsaturated fatty acids (PUFA) into the acylglycerols of borage oil. The acidolysis reaction between borage oil and n‐3 PUFA was carried out with lipase (Lipozyme IM‐60) in organic solvent. The effects of temperature, solvent, and water content on the reaction product were investigated. For the acidolysis reaction between acylglycerols (product of the selective hydrolysis of borage oil, catalyzed by immobilized Candida rugosa lipase) and n‐3 PUFA, the total content of n‐3 and n‐6 PUFA in acylglycerols was 72.8% after a reaction time of 18 h. The contents of γ‐linolenic acid, eicosapentaenoic acid, and docosahexaenoic acid were 26.5, 19.8, and 18.1%, respectively. By properly controlling the reaction time, acylglycerols with ca. 70–72% PUFA and a ratio of n‐3 PUFA to n‐6 PUFA from 0–1.09 can be obtained.

In recent years, zinc oxide (ZnO) has become one of the most popular research materials due to its unique properties and various applications. ZnO is an intrinsic semiconductor, with a wide bandgap (3.37 eV) and large exciton binding energy (60 meV) making it suitable for many optical applications. In this experiment, the simple hydrothermal method is used to grow indium-doped ZnO nanostructures on a silicon wafer, which are then annealed at different temperatures (400°C to 1,000°C) in an abundant oxygen atmosphere. This study discusses the surface structure and optical characteristic of ZnO nanomaterials. The structure of the ZnO nanostructures is analyzed by X-ray diffraction, the superficial state by scanning electron microscopy, and the optical measurements which are carried out using the temperature-dependent photoluminescence (PL) spectra. In this study, we discuss the broad peak energy of the yellow-orange emission which shows tendency towards a blueshift with the temperature increase in the PL spectra. This differs from other common semiconductors which have an increase in their peak energy of deep-level emission along with measurement temperature.

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