Mehmet Rasit Yuce's research while affiliated with Monash University (Australia) and other places

Publications (276)

Article
Since 2020, the coronavirus disease (COVID-19) pandemic has had a substantial impact on all community sectors worldwide, particularly the health care sector. Healthcare workers (HCWs) are at risk of COVID-19 infection due to occupational exposure to infectious patients, visitors, and staff. Contact tracing of close physical interaction is an essent...
Article
Confronted with the COVID-19 health crisis, the year 2020 represented a turning point for the entire world. It paved the way for health-care systems to reaffirm their foundations by using different technologies such as sensors, wearables, mobile applications, drones, robots, Artificial Intelligence (AI), Machine Learning (ML) and the Internet of Th...
Article
Non-contact vital sign monitoring has been an important research topic recently due to the ability to monitor patients for an extended period especially during sleep without requiring uncomfortable attachments. Radar is a popular sensor for vital sign monitoring research. Various algorithms have been proposed for estimating respiration rate and hea...
Article
The respiratory rate and waveform play an important role on reflecting health conditions. Some of the diseases, such as Biot’s Breathing, Chyne-Stokes respiration, require long-term continuous respiration monitoring which is normally conducted by hospitals or sleep centres. Portable sensor devices are required to help patients that are difficult to...
Conference Paper
Existing approaches that assess and monitor the severity of Parkinson's Disease (PD) focus on the integration of wearable devices based on inertial sensors (accelerometers, gyroscopes) and electromyographic (EMG) transducers. Nevertheless, some of these sensors are bulky and lack comfortability. This manuscript presents triboelectric nanogenerators...
Article
Wearable sensors have been implemented widely to provide comfortable and continuous long-term monitoring in many applications. Minimal requirements on maintenance is a main characteristic of wearable sensors, but unfortunately, many of them are still powered by battery with limited capacity which need to be charged or replaced regularly. Energy har...
Article
Objective: This paper aims to introduce a wearable solution and a low-complexity algorithm for real-time continuous ambulatory respiratory monitoring. Methods: A wearable chest-worn patch is designed using a bioimpedance (BioZ) sensor to measure the changes in chest impedance caused by breathing. Besides, a medical-grade infrared temperature sen...
Chapter
Wireless detection of respiration rate (RR) plays a significant role in many healthcare applications. Most of the solutions provide simple waveforms and display the number of estimated RR. In this paper, a visualiser’s approach for the wireless respiration tracking with commercial radar sensor, Walabot, is proposed. Walabot provides a real-time 2D...
Chapter
Batteries were the main power supply for implantable and sensor networks for years. However, new and emerging medical devices and treatments are demanding for more effective, flexible, and long-lasting powering solutions. In the quest to fulfil these new requirements, researchers have been investigating new solutions in making batteries as well as...
Chapter
Typical electrostatic harvesters that use an inductor in their investment and/or reimbursement circuitries are detailed in this chapter. These harvesters often require a large inductance value to operate optimally. The inductor is a bulky component and its presence is undesired in applications with small form-factors, e.g. medical applications. The...
Book
This book provides readers with an overview of kinetic energy harvesting systems, their applications, and a detailed discussion of circuit design of variable-capacitance electrostatic harvesters. The authors describe challenges that need to be overcome when designing miniaturized kinetic energy harvesting systems, along with practical design consid...
Chapter
During a full energy conversion cycle, the capacitance of a variable capacitor changes from maximal to minimal and returns back to maximal again. The operation of a switching electrostatic harvester consists of four phases, in this period. At the start of consecutive investment and harvesting phases, a switching event should occur to initiate these...
Chapter
This chapter focuses on sustainable switched-capacitor electrostatic harvesters. The variable capacitor in this type of electrostatic harvester connects to the storage component (a battery or a large capacitor) through the investment and reimbursement circuitries. These harvesters use only switches (and no inductor) in their investment and reimburs...
Chapter
COVID-19 pandemic has introduced social distance regulations which are crucial to be followed by. In order to maintain proper social distancing, it is critical to regulate the number of people in a closed space. In this paper, we propose a people counting system based on Impulse Radio Ultra-Wideband radars for counting people walking through a door...
Chapter
An electrostatic harvester operates with the frequency of an energy source. During each period of operation, a sequence of events (phases of operation) occur, so that an amount of energy is converted into electrical form. These phases of operation are explained in this chapter. Then, the electrostatic harvesters are categorized into sustainable and...
Article
Full-text available
Vital signs such as heart rate and respiration rate are among the most important physiological signals for health monitoring and medical applications. Impulse radio (IR) ultra-wideband (UWB) radar becomes one of the essential sensors in non-contact vital signs detection. The heart pulse wave is easily corrupted by noise and respiration activity sin...
Article
Full-text available
Background The hospital environment is characterised by a dense network of interactions between healthcare workers (HCWs) and patients. As highlighted by the coronavirus pandemic, this represents a risk for disease transmission and a challenge for contact tracing. We aimed to develop and pilot an automated system to address this challenge and descr...
Conference Paper
This paper presents a wearable sensor patch with real-time respiration monitoring by measuring the change in thoracic impedance resulting from breathing. A bioimpedance (BioZ) sensor with two sensing electrodes is employed to measure the chest impedance. In addition, a medical-grade infrared temperature sensor is utilized to detect body temperature...
Article
Continuous monitoring of human motion and its interaction with the surrounding environment is crucial for healthcare applications such as early diagnosis of neurological disorders, or rehabilitation of vulnerable patients with walking difficulties in hospital and age-care settings. Additionally, it is also necessary to provide assistive care to vis...
Article
Full-text available
Nowadays, location awareness becomes the key to numerous Internet of Things (IoT) applications. Among the various methods for indoor localisation, received signal strength indicator (RSSI)-based fingerprinting attracts massive attention. However, the RSSI fingerprinting method is susceptible to lower accuracies because of the disturbance triggered...
Article
Full-text available
Sensor technology and advanced sensing systems are today experiencing a radical transformation which is affecting the way to conceive daily life. Sensors and sensing systems may improve the quality of life by providing more and more efficient care, safety, and new services for better living.
Article
Dense iodinated reduced‐graphene oxide (rGO) with outstanding electrical and electrochemical properties is produced through a green method comprising liquid crystal‐mediated assembly of polyiodides and GO, and subsequent UV irradiation. The dense rGO electrode (1.46 g/cm 3 ) exhibited a very high volumetric capacitance of 226 F/cm 3 , a factor of t...
Article
There is a significant interest in exploring the human body internal activities and measuring important parameters to understand, treat and diagnose the digestive system environment and related diseases. Wireless capsule endoscopy (WCE) is widely used for the gastrointestinal (GI) tract exploration due to its effectiveness as it provides no pain an...
Article
The past decade has witnessed growing interest in developing soft wearable pressure sensors with the ultimate goal of transforming today's hospital-centered diagnosis to tomorrow's patient-centered bio-diagnosis. In this context, battery-free wireless antenna-based pressure sensors will be highly advantageous for ubiquitous real-time health monitor...
Article
Many variable-capacitance energy harvesters employ a large inductor to improve their power efficiency by reducing conduction losses, which is suboptimal in applications requiring a small form-factor, such as in implants. This article describes a variable-capacitance harvester that performs optimally using miniaturized inductors. The impact of scali...
Article
In many conventional Internet of Things (IoT) applications, data is transferred directly from the sensor network to the cloud via a gateway for further data processing. However, this typical usage of a gateway is not suitable for every application. For short-range IoT wireless protocols (e.g., Bluetooth Low Energy (BLE)), multiple gateways are requ...
Article
Full-text available
This paper presents a novel low EMI technique to regulate the output voltage of fully-integrated switched capacitor Dickson type step-up DC/DC converters for SPAD arrays implemented in the Silterra 0.13 μm HV-CMOS process. SPAD sensors are extremely sensitive to EMI and therefore require careful biasing. This design utilises current sources to limi...
Article
Full-text available
In the present era of the Internet of Things, wearable sensors have been receiving considerable attention owing to their great potential in a plethora of applications. Highly sensitive chemical type wearable sensors that can conformably adhere to the epidermis or textiles for monitoring personal microenvironment have gained incredible interest. Att...
Article
Full-text available
Parkinson's disease (PD) is a degenerative, neurological disease that causes motor dysfunctions on the patient. Currently, the symptoms and progression of the disease are assessed by physicians who diagnose through careful observation, according to the Movement Disorder Society (MDS)‐sponsored Revision of the Unified Parkinson's Disease Rating Scal...
Article
Hospital associated infection (HAI) can lead to serious medical issues in healthcare systems, which is a major concern in the recent era. Hand hygiene is considered as an effective measure to prevent cross infections in hospital environments. Research efforts in the field of Internet of Things (IoT) can provide reliable edge-based solutions in hosp...
Article
Time-of-flight (ToF) sensors using light pulses or continuous waves allow accurate distance measurements. Three-dimensional imagers can be based on an array of timing or time-gated integration pixels. Single-photon avalanche diodes (SPADs) have been increasingly chosen as the pixel’s photodetector device to develop fast, long-range ToF sensors. Sol...
Article
This paper presents a 64 × 64 dual mode flash LIDAR sensor that utilizes a triple integration timing technique. The sensor, fabricated in 130nm HV CMOS, is capable of operating in both a direct time-of-flight (ToF) mode where the timestamp of the first arriving photon is recorded per-pixel, as well as a photon counting mode where the number of phot...
Article
Full-text available
The era of artificial intelligence and internet of things is rapidly developed by recent advances in wearable electronics. Gait reveals sensory information in daily life containing personal information, regarding identification and healthcare. Current wearable electronics of gait analysis are mainly limited by high fabrication cost, operation energ...
Article
A soft skin-like wearable device is an ideal next-generation human-machine interface (HMI) in that they can enable seamless information collection and relay anytime and anywhere. However, it is non-trivial to realize such soft HMI in the conventional way that electronics are designed and manufactured. Here, we report on an electronic tattoo-like, t...
Conference Paper
Pulse wave and respiration are two important vital signals in diagnosing and treating diseases. In this paper, we investigated a Bio-impedance (BImp) based respiration and pulse wave monitoring system. The BImp signal is successfully extracted from a wearable device placed on the shoulder. Using the rate calculation algorithm, heart rate (HR), and...
Conference Paper
People with body disabilities as a result of neurological diseases or physical accidents, face daily troubles in some situations that require arm or finger motions. Access to expensive assistive technologies can be difficult, and job opportunities can be low for patients with limited mobility. Triboelectric nanogenerators (TENGs) bring a new concep...
Article
Continuous monitoring of vital bio-signals is crucial to track the well-being of patients and to allow for timely medical intervention in cases of emergency. This paper presents a compact and wearable electrocardiogram (ECG) sensor using graphene-elastomer electrodes, which were characterised, first using an electronic patient simulator, then on a...
Article
This work presents a clinical study of a chest‐based blood pressure (BP) monitoring technique. This research was designed to examine pulse transit time (PTT) and to measure beat‐to‐beat and cuff‐based Systolic BP (SBP) and Diastolic BP (DBP). The PTT values were extracted as the time difference between the end of the pre‐ ejection period (PEP) meas...
Article
The rapid expansion of Internet of Things (IoT) in many living environments, such as smart home, has motivated the development of human-machine interfaces (HMIs) for the interactions between human and machine. In this paper, a sliding operation triboelectric nanogenerator (TENG) based control disk interface, generating 3-bit binary-reflected Gray-c...
Article
Continuous navigation information for medical insertion methods including wireless capsule endoscopy is an important feature to guide a medical instrument/object to the targeted location within a hollow organ or internal cavity of the patient in the best possible way. Also, an autonomous medical insertion or swallowable device with a self-contained...
Chapter
A wearable continuous beat-to-beat blood pressure (BP) monitoring system on the arm, based on a 4-channel photoplethysmography (PPG) array is presented in this paper. Three pulse transit time (PTT) values have been derived from the combinations of PPG signals from the sensors array. We evaluated the system on a group of 5 healthy male subjects. The...
Chapter
Cuffless blood pressure (BP) estimation using pulse arrival time (PAT) has become popular in recent years. There are several approaches to calculate PAT from various sensors placed on the body. In this chapter, the shoulder’s bio-impedance (BImp) signal is used as a surrogate together with ECG to estimate cuffless systolic BP (SBP) based on four di...
Chapter
The power supply plays an important role in wireless sensor nodes because they are mainly powered by rechargeable batteries and require regular charging. For uninterrupted and convenient system design, energy harvesting for wearable devices is of great importance. This paper presents an indoor energy harvesting module designed for safety applicatio...
Chapter
This study presents a method of calculating the pre-ejection period (PEP) from simultaneous records of the electrocardiogram (ECG) and continuous wave radar (CWR). The PEP is derived as the interval between R-wave peak of ECG and the foot of CWR signal measured at the sternum. Data collected from 40 subjects participating in different postural expe...
Article
Triboelectric nanogenerators show great potential as flexible motion transducers for wearable human-machine interfaces (HMI). The present research explores a new configuration named Non-Attached Electrode-Dielectric Triboelectric Sensor (NEDTS) and its application in specialized HMI to support people with disabilities in daily life. In this topolog...
Article
The Internet of Things (IoT) is a new communication paradigm that can connect elements from various fields through the Internet. One of the most attractive IoT applications is in the modern healthcare area, as the traditional healthcare system has an increasing demand for social resources, including doctors, nurses, hospital beds, and health monito...
Article
Full-text available
The pulse arrival time (PAT), pre-ejection period (PEP) and pulse transit time (PTT) are calculated using on-body continuous wave radar (CWR), Photoplethysmogram (PPG) and Electrocardiogram (ECG) sensors for wearable continuous systolic blood pressure (SBP) measurements. The CWR and PPG sensors are placed on the sternum and left earlobe respectivel...
Chapter
Fall is the leading cause of death among elderly people worldwide. In this work a low power portable continuous wave radar (CWR) system is proposed to detect elderly fall. This paper presents experimental evaluation of the system to detect human fall motion among various sitting, standing and walking activities. Signals from three subjects with dif...
Chapter
Measurement technologies of arterial parameters are mostly based on processing blood pulse wave which is an important representation of cardiac activity. The pulse wave is structured with forward and reflected waves which are affected by individual physiological parameters such as the blood intensity, the elasticity of the aorta, artery elasticity...
Article
Full-text available
This paper presents a flexible sliding sensor that is capable of generating signals for wireless controlling applications. The sensor is based on the coupling of triboelectrification and electrostatic induction effects. A signal processing circuit has been designed to process the alternating current (AC) signal generated by the sensor, which is exe...
Conference Paper
Navigation is an important feature needed for medical insertion procedures. It is required to guide the medical device in the right direction at the right time. Navigation techniques used in the Wireless Capsule Endoscopy and conventional endoscopy fields are based on image-guided systems that require a large amount of data to be transferred and pr...
Conference Paper
This paper proposes a wireless wearable sensor system for the continuous beat-to-beat blood pressure (BP) monitoring. The real-time BP can be estimated utilising a 2-parameter regression model based on the pulse arrival time (PAT) and heart rate (HR). The PAT is defined as the time interval between the electrocardiogram (ECG) R-peak and the corresp...
Article
Blood pressure (BP) is a critical vital sign in health, measured millions of times per day worldwide. Current BP measurement requires cumbersome tools, is painful and can be inconvenient. Non-invasive cuffless BP measurement based on pulse arrival time (PAT) techniques allow an alternative way of monitoring BP in healthcare settings with refined we...
Article
Surface plasmons propagating on conductive fabrics can be used to connect wearable sensors around the body, creating a secure and versatile body area network.
Article
Environmental pollution is a major issue for public health and safety. Measurement of fine-grain spatiotemporal distribution of pollution for a micro-environment is necessary to explore the correlations among environment, health and behavior. Continuous advancement of miniature environmental sensing devices, microelectronics and communication techn...
Article
Control interfaces are important devices for connecting human with machines to achieve various manipulations. Recently, the emerging triboelectric based control interfaces exhibit great advantages in flexible wearable and battery-less applications. To further reduce the device complexity and improve the device practicability, a minimalist control i...
Article
Present Human Machine Interfaces (HMIs) that vary in shapes, operation schemes, and functions can be frequently found in our daily life, and the giant market demand has been pushing the development of the HMIs since the last decades. To greatly extend the communication channels between humans and external devices in a natural way, here we report an...
Chapter
A wearable health monitoring system combined with Internet of Things (IoT) is going to be a promising alternative to the conventional healthcare systems. In this work, a small, flexible and wearable real-time electrocardiograph (ECG) monitoring system integrated on a T-shirt is proposed. It uses an off-the-shelf biopotential analog front end (AFE)...
Chapter
People spend more than 90% of their time indoor in Australia. Poor indoor air quality can cause severe health problems to individuals. It is necessary to develop a reliable and wearable systems for environmental monitoring. This chapter presents a low-power wearable sensor node for environmental Internet of Things (IoT) applications, forming wirele...
Article
Full-text available
This paper presents a hybrid wearable sensor network system towards the Internet of Things (IoT) connected safety and health monitoring applications. The system is aimed at improving safety in the outdoor workplace. The proposed system consists of a wearable body area network (WBAN) to collect user data and a low-power wide-area network (LPWAN) to...
Conference Paper
Asynchronous electrostatic generators have the advantage of omitting the control circuit used for synchronizing mechanical movements with electrical switching events, which results in simplified implementation. In this paper, an improved optimization procedure is proposed for this type of electrostatic generator and its performance in responding to...
Article
Linear-feedback shift register (LFSR) counters have been shown to be well suited to applications requiring large arrays of counters and can improve the area and performance compared with conventional binary counters. However, significant logic is required to decode the count order into binary, causing system-on-chip designs to be unfeasible. This p...
Article
Full-text available
Poor environmental conditions can lead to severe health problems. It is essential to develop effective, reliable, and fast response systems for people working in hazardous environments. This paper presents a wearable Internet of Things (IoT) sensor network aimed at monitoring harmful environmental conditions for safety applications via a Lora wirel...
Article
In this paper, a wireless implantable sensor prototype with subcutaneous solar energy harvesting is proposed. To evaluate the performance of a flexible solar panel under skin, ex-vivo experiments are conducted under natural sunlight and artificial light sources. The results show that the solar panel covered by a 3 mm thick porcine flap can output t...
Conference Paper
This paper presents the study of subcutaneous solar energy harvesting for implantable sensor systems. The characteristics of a flexible solar panel under a 3 mm thick porcine skin are measured under different ambient light conditions. The output power of the solar panel when covered by the skin varies from tens of micro Watts to a few milli Watts d...
Article
Conventional radiological and endoscopic techniques utilizing long tubes were ineffective in visualizing the small bowel mucosa until the development of Wireless Capsule Endoscopy (WCE). WCE is a revolutionary endoscopic technology that can diagnose the complete gastrointestinal (GI) tract. However, the existing capsule technologies are passive, an...
Article
Integrated devices acquiring environmental, industrial or biomedical signals are ubiquitous and require sensor systems to be situated in electromagnetically hostile environments and continue to operate reliably. The susceptibility to injected electromagnetic interference by an 8-bit flash Analog to Digital Converter (ADC) was measured using the dir...
Conference Paper
This paper presents a wearable Internet of Things (IoT) sensor node aimed at monitoring harmful environmental conditions for safety applications via LoRa wireless technology. The proposed sensor node is low-power and supports multiple environmental sensors. A LoRa based gateway is used to connect sensors to the Internet. We mainly focus on monitori...
Conference Paper
An autonomous Internet of Things (IoT) wireless sensor network (WSN) powered by a solar energy harvester with low power electronics is presented in this paper. The power supply is a critical challenge for IoT sensors as many of them normally have limited lifetime due to the battery with limited capacity used. The WSN system, sensor node electronics...
Article
This correspondence discusses the implementation of clock slope control to reduce emissions from fully-integrated step-up dc/dc converters. The addition of clock slope control is a common technique used to reduce electromagnetic emissions normally associated with charge pumps. The clock slope control is coupled with frequency and current control vo...
Article
Motivation: In the state of the art, typically bioimpedance, heart sounds and / or ultrasound is used to measure STIs. All three methods suffer from insufficient accuracy of STI estimation due to various reasons. CW radar is investigated for its ability to overcome the deficiencies in the state of the art. Methods: Ten healthy male subjects aged...
Conference Paper
This paper describes a continuous wave (CW) radar system with body-contact antennas and basic signal processing. The goal is to assess the signals' reproducibility across different subjects as well as a respiration cycle. Radar signals using body-contact antennas with a carrier frequency of 868 MHz are used to acquire the cardiac activity at the st...
Conference Paper
We present an ultra low power analogue adaptive sampler for extraction of features from an arterial blood pressure signal, prior to ADC operation or conversion. The architecture is implemented and simulated in UMC 180 nm technology. A worst case power consumption across process variation of 124.6 nW was achieved, with a process invariant key-point...
Conference Paper
Wearable sensor nodes have gained a lot of attention during the past few years as they can monitor and record people's physical parameters in real time. Wearable sensor nodes can promote healthy lifestyles and prevent the occurrence of potential illness or injuries. This paper presents a flexible wearable sensor system powered by an efficient solar...
Conference Paper
The pressure field that exists between the foot and the supporting surface is identified as the foot plantar pressure. The information obtained from foot plantar pressure measurements has useful applications that include diagnosis of gait disturbances, optimization of footwear design, sport biomechanics and prevention of injury. Using wearable tech...