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Open accessProceedings ArticleDOI
11 Mar 2019
29 Citations
Our solution, WiWear, has two key innovations: 1) beamforming WiFi transmissions to significantly boost the energy that a receiver can harvest ~2-3 meters away, and 2) smart zero-energy, triggering of inertial sensing, that allows intelligent duty-cycled operation of devices whose transient power consumption far exceeds what can be instantaneously harvested.
To improve signal-to-noise-plus-interference-ratio, interference can be mitigated using advanced receivers like an interference rejection combining (IRC) receiver.
In this way, it is possible to increase the signal strength at the receiver.
For home and work environments, aggressive WiFi scans can significantly improve the speed at which mobile nodes join the WiFi network.
It is shown both by theory and computer simulations that the proposed scheme can effectively improve the signal-to-noise ratio at the receiver.
In the additive white Gaussian noise channel, our proposed receiver provides 3 dB signal-to-noise ratio gain over the conventional receiver, and the performance gain can be more than 3 dB in frequency selective channels.
Proceedings ArticleDOI
Sihui Han, Kang G. Shin 
01 May 2017
18 Citations
It enhances both WiFi signal and low-power IoT devices without changing their configurations or network protocols.
However, the multi-path fading of WiFi signals causes time-varying received signal strengths of WiFi signals, which leads to poor accuracy of WiFi localization.
Proceedings ArticleDOI
17 Aug 2015
418 Citations
Specifically, we show that it is possible to design devices and WiFi APs such that the WiFi AP in the process of transmitting data to normal WiFi clients can decode backscatter signals which the devices generate by modulating information on to the ambient WiFi transmission.

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What is the meaning of Article 1351 of the Civil Code of the Philippines?
3 answers
Article 1351 of the Civil Code of the Philippines refers to the principle of plural legal systems within the country, specifically recognizing the validity of the Muslim Personal Laws alongside the Family Code and Civil Code. This article acknowledges the distinct legal culture of the Muslim minority in the Philippines, which is based on Islamic principles. It was enacted in 1977 as a means to manage the situation of legal pluralism in the country. The complexities involved in the conceptualization and drafting of this Code include the use of ethnographic descriptions of Muslim customary law, the selection of rules from different schools of Islamic jurisprudence, and the harmonization of conflicts between laws applicable to Muslims and non-Muslims in the Philippines.
How does the flow cytometry method compare to conventional microscopy in terms of speed and accuracy?
5 answers
Flow cytometry offers advantages over conventional microscopy in terms of speed and accuracy. By incorporating high-resolution imaging capabilities, flow cytometry allows for complex morphological analysis of cellular and sub-cellular structures, which is not possible with standard microscopy. Additionally, flow cytometry can achieve high-throughput measurements of single-cell morphology and texture, providing information indicative of cell types, states, and functions. On the other hand, conventional microscopy is limited in accuracy when assessing cell sizes and total biomasses, especially for small-celled algae. While flow cytometry can accurately count and differentiate white blood cells (WBCs) and provide WBC differential counts, it may have difficulties in detecting eosinophils and non-blood cells in certain body fluids. Overall, flow cytometry offers faster and more accurate analysis of cellular structures and functions compared to conventional microscopy, but there are specific limitations and challenges for each method depending on the sample type and analysis requirements.
What are the healthcare-associated infections and nosocomial transmission of Candida auris infections?
5 answers
Healthcare-associated infections, also known as nosocomial infections, are a significant public health concern in hospital settings. Candida auris, a multidrug-resistant yeast pathogen, has emerged as a major threat due to its ability to cause outbreaks and its resistance to antifungal drugs. C. auris can easily contaminate the environment and is transmitted to new patients during close contact, leading to clonal outbreaks in healthcare facilities. The incidence of C. auris infections has increased among hospitalized patients with COVID-19, particularly the multi-drug resistant strains. The spread of C. auris in healthcare settings is a concern during the COVID-19 pandemic, and strict infection prevention and control measures, including isolation of affected patients and regular screening of non-affected patients, are recommended. Nosocomial transmission of C. auris has been reported during the worldwide spread of COVID-19, and antifungal drug resistance has been observed in many cases.
How have high throughput methods been used in drug screening with caenorhabditis elegans?
5 answers
High throughput methods have been used in drug screening with Caenorhabditis elegans. One study developed a modular pipeline for image processing and analysis for both parasitic and free-living worms, which can be adapted for use on similar imaging platforms. Another study established an efficient high-content screening technique using fluorescence imaging to discover bioactive natural products in C. elegans. They screened compounds on a transgenic worm strain and quantified the fluorescence of a specific protein to identify compounds that promoted its synthesis or secretion. A different study developed an automated and highly-integrated platform for high-throughput toxicity testing using C. elegans. This platform incorporated microfluidics, image acquisition/analysis, and automated food/drug delivery to evaluate general and neurotoxicology endpoints induced by environmental contaminants. Additionally, a study used a label-free survival assay to screen multiple microbial isolates for their effects on C. elegans susceptibility to severe heat and oxidative stresses, providing a pipeline for prescreening probiotics. Lastly, a practical and cost-effective high throughput screening assay was established to measure the motility of C. elegans and screen small molecules for potential anthelmintic candidates.
What are the symptoms of the latest predominant Covid strain?
5 answers
The symptoms of the latest predominant strain of COVID-19 include fever, dry cough, fatigue, dizziness, anorexia, headache, expectoration, dyspnea, chest tightness, abdominal pain, diarrhea, nausea, persistent breathlessness, cough, chest pain, palpitations, neurological and cognitive deficits, rashes, and gastrointestinal dysfunction. In addition, other less common symptoms reported include muscle aches, conjunctivitis, skin manifestations such as morbiliform rash, urticaria, COVID fingers, vesicular eruptions, and livedo reticularis. These symptoms can persist for a minimum of 4 weeks after the onset of the infection, leading to a condition known as 'long COVID'. It is important to recognize the gastrointestinal symptoms of COVID-19, such as decreased appetite, diarrhea, nausea, vomiting, and abdominal pain, as they may be present in a substantial number of confirmed patients.
How can the damping coefficient of a synchronous machine be calculated?
5 answers
The damping coefficient of a synchronous machine can be calculated using various methods. One approach involves acquiring the voltages and currents of the machine before and after a frequency change, and then using a pre-established expression to calculate the damping coefficient. Another method involves analyzing the damping torque and the dynamics of the transient/subtransient reactances to understand the damping mechanism of synchronous generators. Based on this analysis, a dynamical virtual impedance can be used to emulate the damping mechanism and eliminate the need for a large damping coefficient in virtual synchronous machines. Additionally, a damping configuration method involves building a model of the virtual synchronous machine and calculating a response function of output active power variation to load-side frequency variation. The extreme values of this response function can then be solved to obtain a maximum value expression of the output active power, which can be used to configure the damping of the virtual synchronous machine.
How can electronic communication platforms be used to improve communication?
5 answers
Electronic communication platforms can be used to improve communication in several ways. One way is by providing audio or video conferencing capabilities, where streams are transmitted from client stations to a central media server, which then re-transmits the streams to all other stations. Another way is by controlling notifications and automatic acceptance of calendar event invitations based on user-assigned priority scores. These platforms can also award credits for completion of work tasks and deduct credits for sending messages or subscribing to feeds, incentivizing productivity. Additionally, communication systems can be enhanced by allowing users to program information into a central processing center, which can then be transmitted to their communication devices without the need for separate input. Overall, electronic communication platforms offer various features and functionalities that facilitate efficient and convenient communication.
What is waste, plastic?
3 answers
Waste plastic refers to the discarded materials made of synthetic or natural polymers that have lost their customer properties due to being used and are no longer wanted. Plastic waste is a major component of municipal solid waste and poses a significant threat to the environment and human health. Plastics have several advantages, such as durability, lightweight, and good barrier properties, which make them a sustainable alternative to other materials. However, the difficulty in decomposing plastic and the improper management of plastic waste lead to its accumulation in landfills and the environment. To address this issue, there is a need for effective waste management strategies, including recycling and reuse of plastic materials. The concept of a circular economy, which aims to promote resource efficiency and minimize waste, is crucial in managing plastic waste. Additionally, the development of bioplastics and the adoption of the 3R approach (Reduce, Reuse, Recycle) can contribute to mitigating the plastic waste problem.
What are circular connectors ?
4 answers
Circular connectors are a type of electrical connectors that have a cylindrical shape and are used to connect and disconnect electrical circuits. They are designed to accommodate plugs of varying diameters and can include multiple electrical terminals arranged in a cylindrical configuration. These connectors can have signal contact members and power contact members placed in an array, with the signal contact members offset from the power contact members. Circular connectors can also have a mounting region for a clamping nut and a cup-shaped holding section for the cable. They can be designed with a radial quarter-round shape, allowing for easier trace length maintenance and layout flexibility while maintaining signal integrity. Additionally, circular connectors can have pins machined from a single piece of metal, with a constant cross-section and a slot that gradually closes when inserted into a socket of circular section.
How many institutes used the SEIR model to calculate covid mortality in India?
5 answers
The SEIR model was used by multiple institutes to calculate COVID-19 mortality in India. Yin et al. proposed a modified SEIR model to study the transmission dynamics during the first wave and estimate undetected cases. Selvamuthu et al. employed a SEIRD model to estimate the mortality rate and predict the severity of the situation during the second wave. Sampath and Bose modified the SEIR model equations to account for factors like lockdowns and fit the model to daily infection data in India. Kishore et al. used a generalized SEIR model to predict the spread patterns of COVID-19 in India, including the number of active, recovered, death, and total cases. Therefore, at least four institutes used the SEIR model for calculating COVID-19 mortality in India.
Islanding using wavelet transform
5 answers
Islanding detection using wavelet transform is a commonly used method in distributed generation (DG) systems. Several papers propose different approaches to detect islanding using wavelet transform combined with machine learning techniques. Spötl and Yilmaz & Bayrak present methods that use wavelet transform and artificial neural networks (ANN) for islanding detection. Another paper by Ajith & Shereef proposes a method that uses wavelet transform decomposition and K-Nearest Neighbor (KNN) classification for islanding detection. These methods aim to reduce the non-detection zone (NDZ) and improve the detection time for islanding events. The use of wavelet transform allows for the extraction of detailed coefficients that can capture transient variations during islanding. By combining wavelet transform with machine learning techniques, these methods provide effective islanding detection in DG systems.