Cristi Rotariu

The paper describes the evolution in design and implementation of a new complex electro-informatics assistive medical system used for the communication with neuromotor disabled patients. These patients are severe handicapped persons who cannot interfere with real world by normal ways like speech, writing or language signs. Fortunately, these person...

In this paper, the development of an eye-tracking-based human–computer interface for real-time applications is presented. To identify the most appropriate pupil detection algorithm for the proposed interface, we analyzed the performance of eight algorithms, six of which we developed based on the most representative pupil center detection techniques...

In this paper, we present a new complex electronic system for facilitating communication with severely disabled patients and telemonitoring their physiological parameters. The proposed assistive system includes three subsystems (Patient, Server, and Caretaker) connected to each other via the Internet. The two-way communication function is based on...

In the last years the demographic changes and ageing of population increase health care demand. The growing number of chronic patients and elders requires close attention to their health conditions. In this paper we present the realization of a wireless remote monitoring system, based on body area network of medical sensors, capable to measure proc...

The monitoring and analysis of antepartum fetal and maternal recordings is a research area of notable interest due to the relatively high value of preterm birth. The interest stems from the improvement of devices used for monitoring. The current paper presents the spectral analysis of antepartum heart rate recordings conducted during a study in Rom...

Cardiovascular diseases are one of the major problems of humanity and therefore one of their component, arrhythmia detection and classification drawn an increased attention worldwide. The presence of randomness in discrete time series, like those arising in electrophysiology, is firmly connected with computational complexity measure. This connectio...

This paper presents a comparison of different threshold-based selection methods, implemented and adapted for eye image segmentation. We used three subclasses of segmentation methods: fixed threshold segmentation (fixed threshold, quantitative threshold and cumulative distribution function method), global threshold segmentation (minimum error Kittle...

The modern approaches in teaching and learning for basic engineering sciences include the usage of computer simulations, collaborative learning, problem-based learning and Internet access. The cognitive process is a complicated one, and the learning methodologies must be often focused on particular area of knowledge. Feedback messages can help in p...

Aim: Fetal acidosis is a consequence of anaerobic metabo-lism due to lack of or a limited amount of oxygen delivered through the umbilical cord to the fetus. Direct determination of fetal blood pH remains the current method used in practice and needs fetal blood extraction. This is an elaborate procedure and cannot be performed or re-peated anytime...

The implementation of a hand gesture detection using a stereo camera system is used to determine the hand position in a space described by two intersecting planes and the finger position by determining the finger tips, which leads to the classification of the hand image viewed from above into six different types. The hand movement is simulated usin...

Monitoring of the evolution of the pregnancy from early stages presents high interest due to the possibility of identifying high risk situations that can be further managed by health care professionals. One of the more recent and promising methods of monitoring fetal and maternal physiological wellbeing is the electrohysterogram (EHG) which is a no...

Traditional methods of fetal monitoring are used mainly during labor, leaving the only course of action  the caesarean intervention  in cases with high risk of fetal distress. We used another approach and set up a database that consists of cardiotocographic (CTG) recordings acquired ante partum during the 25th-28th week of pregnancy, by means of...

Eye-tracking devices are currently used for improving communication and psychosocial status among patients with neuro-motor disabilities. This paper presents the experimental implementation of a control system for a robotic platform using eye tracking technology. The main system is based on an eye tracking subsystem that uses the circular Hough tra...

Because sleep disorders are common in a significant part of the entire population with diseases of the central nervous system, continuous monitoring of respiration during sleep has an important role in early diagnosis and treatment. The paper describes the research for the design and realization of a flexible, scalable and cost-effective medical mo...

The paper presents the analysis of methods used to implement eye blinking selection in an eye tracking system used in assistive technology for patients with neuro-motor disabilities. The system uses for selection the key words technology or ideograms presented on the user's screen. The method used for blinking detection is based on image segmentati...

In this paper we propose to investigate the possibility to use the randomness from different types of arrhythmias for detection and classification of them from ECG signals. Randomness present in discrete time series is strongly connected with complexity of information present in substrings associated with time series and an appropriate coding of th...

Aims: The aim of our study was to analyze the variation of acoustic output, as expressed by the thermal (TI) and mechanical index (MI), during the learning curve for a fetal heart scan at 11-13 gestational weeks, with the introduction of a new ultrasound system. Material and methods: This was a prospective, observational study on 303 normal fetu...

The experiment proposes to identify the minimum required time of exposure to generate decoding and meaning at visual lexical items and identify the relation between type of stimulus, reaction times and stimulus exhibition duration. A group of 50 persons was tested at a lexical decision task using lists of intermixed word, pseudoword, non-words and...

The paper describes a software application running on Android mobile devices, used to help the neuromotor disabled patients to communicate with the clinicians or caretakers. The proposed application also include a telemonitoring (remote monitoring) component used to collect and process few physiological parameters of the patient. The application is...

Today, health information technology is the area of IT involving the design and development of telemedicine solutions, providing to patients medical services that enhance their quality of life. Technological advances in integrated circuits and wireless communications have led to the design and fabrication of low-cost, low-power, miniature, and inte...

This paper presents the implementation of an eye-tracking device based on the circular Hough transform algorithm. The proposed device is a part of a complex integrated system for assistance in communicating with and telemonitoring severe neuromotor disabled patients, which consists of an infrared video camera and a PC used to process the captured s...

The paper presents a software application which implements a dialog between neuromotor disabled patients and clinicians. The patient can't speak normally, but he can manifest his intention by moving a finger or other body part which can be translated into a mouse click. The software application reads the mouse click and builds a message for the nur...

In this paper we present a novel method to develop an atrial fibrillation (AF) based on statistical descriptors and hybrid neuro-fuzzy and crisp system. The inference of system produce rules of type if-then-else that care extracted to construct a binary decision system: normal of atrial fibrillation. We use TPR (Turning Point Ratio), SE (Shannon En...

Given the fact that this start of the millennium is clearly dominated by biotechnology, a great deal of attention is focused on the educational environment. The scope of this paper is to emphasize an innovative approach in biotechnology education: robotics technology. There are presented robotics-based activities which use data-collection technolog...

Fetal acidosis is reflected by the values of umbilical cord pH and base deficit (BDecf): normal recordings (pH over 7.2 and BDecf under 8 mmol/l) and abnormal recordings (pH under 7.2 and BDecf over 8 mmol/l). The purpose of this paper is to present the implementation of an automated system for detecting fetal acidosis in cardiotocographic recordin...

The purpose of this study is to highlight the dynamic relationship between the cardiotocographic signals: intrapartum fetal heart rate and uterine pressure, for normal and hypoxic fetuses. The database used in our study contains 531 normal or abnormal recordings (abnormal recordings are considered those with pH value under 7.15). We have used the p...

The purpose of this paper was to design and develop a reliable remote monitoring system that allows health care professionals to monitor the daily calories expenditure of obese subjects. The system was implemented by using the Z430-Chronos wireless development kit and BM-CS5 wireless chest strap. These devices were used to acquire and wirelessly tr...

This paper describes the research for the design and realization of a flexible, scalable and cost-effective medical wireless measurement system for remote monitoring of changes in patient's electrical bioimedance, based on wireless sensor networks. The bioimpedance is continuously measured using a custom developed wireless sensor node and then is w...

This paper presents a robust technique for pupil center coordinates detection that uses the circular Hough transform technique. The algorithm of the proposed application is based on detecting the circle which represents the pupil edge from a set of eye images captured using an infrared camera which employs the dark-pupil technique. The accuracy of...

This paper presents a software application which helps the neuromotor disabled patients to communicate with the clinicians. The proposed system also includes a telemonitoring component which collects the signals corresponding to various patients' physiologic parameters. Due to their affections, the patients can't speak or write but they can manifes...

A new predictor that takes into accounts the randomness of RR interval before PAFib is proposed. Using data mining techniques, temporal patterns are identified based their presence in ECG that precedes paroxysmal atrial fibrillation (PAF) and not present in patients with normal ECG. The algorithm used the supposition that the premature atrial compl...

The aim of this study is the identification of the dynamic relationship between intrapartum fetal heart rate (FHR) variability and uterine pressure (UP) for normal and hypoxic fetuses. A new method for automatic analysis and identification of uterine contractions is developed and tested on 552 recordings. Using contractions, the fetal heart rate va...

Sleep represents a dynamic physiological process having an important role in the restoration of the central nervous system. Nowadays, because a significant part of the population suffers of sleep disorders, the dynamic long time continuous monitoring of human respiration has an important role in diagnosis and treatment. This paper proposes a flexib...

The physiological response during fetal distress caused by labor varies from case to case and it is reflected both in the umbilical cord pH value and the fetal cord arterial base deficit (BDecf). The purpose of this study is to reveals the changes in fetal heart rate variability in abnormal cases (pH < 7.2 and BDecf > 8 mmol/L). Fetal heart rate va...

The experiment purposes to assess which type of mental strategy in training lexical abilities has the best reaction time improvement. Three groups of 16 persons each (equal men-women), equalized distributed as lexical performance after a pre-evaluated test were trained three days each using one of three type of methods - icon-nonlexical, graphemic-...

Nowadays a significant part of the population suffers of sleep disorders, so the dynamic long term monitoring of skin temperature during sleep is very useful for analysis and understanding the circadian rhythm. In this paper we describe the realization of a patient skin temperature monitoring system, based on wireless devices, capable to measure an...

A complex goal in biomedical information technology today is the design and implementation of telemedicine and e-health solutions, which provide (chronic) patients and elderly people services that can enhance their quality of life. We used wireless sensor network technology, low-power integrated embedded systems and wireless communications, which h...

The main reason of this study is the long-term effects of atrial fibrillation of the human heart, which lead to increased risk of cardiac mortality. This paper presents the use of two different methods for the prediction of the onset of paroxysmal atrial fibrillation (PAF) by means of surface electrocardiographic (ECG) signal automatic analysis. Th...

Learning disabilities affect the brain's ability to receive, process, analyze, or store information. Dyslexia is one of the most common learning disabilities. Also called specific reading disability, dyslexia is a common reading and language disorder. It is not linked to any kind of deficit in intelligence overall, educational opportunity, or motiv...

It is already demonstrated that mental or psychological stress can affect human health, since it is a major risk factors for numerous current diseases such as: high blood pressure, congestive heart failure, coronary diseases, stroke, causing often sudden death. These diseases are particularly dangerous in the case of car drivers, since they have to...

This paper describes an integrated system of wireless temporary pacemakers for remote monitoring of patients suffering from cardiac arrhythmias, especially atrial fibrillation. The system is built around a low power cardiac pacemaker with wireless data transmission capability, used for patient monitoring into a limited area. The proposed system is...

This study presents the use of two different methods for the automatic prediction of the onset of paroxysmal atrial fibrillation (PAF) by means of surface electrocardiographic (ECG) signal. The first method is commonly used and consists in the analysis of the heart rate variability (HRV) of the ECG signal. Two significant parameters are taken into...

This paper describes the research carried out for designing and producing an integrated system for monitoring patients suffering from cardiac arrhythmias. Our system is based on a wireless sensors network (WSN) and can be used in hospital or at home. It is able to measure and transmit the patient's heart rate (HR) by radio to a central telemonitori...

Sleep is a dynamic physiological process, its primary function being the restoration of the central nervous system. Because sleep disorders affect a significant part of the population the dynamic long term monitoring of human respiration plays a very important role in diagnosis and treatment. We describe a remote monitoring system designed for in-h...

This paper describes the design and implementation of a wireless remote monitoring system for patients with temporary cardiac pacemakers. The system is built around a low power cardiac pacemaker with wireless data transmission capability, used for patient monitoring in to a limited area. The proposed system is designed to be used in emergency situa...

Mental stress is one of the major risk factors for many diseases such as hypertension, coronary artery disease, heart attack, stroke, even sudden death. Conventionally, interviews, questionnaires or behavior observation are used to detect mental stress in an individual. In our study, we have investigated objective characteristics, like various shor...

This paper describes the design and implementation of a wireless remote monitoring system for patients with temporary cardiac pacemakers. The system is built around a low power cardiac pacemaker with wireless data transmission capability, used for patient monitoring in to a limited area. The proposed system is designed to be used in emergency situa...

In this paper is described the design and implementation of a wireless atrial fibrillation monitoring system, for realtime remote patient monitoring in a limited area, using wireless sensor networks (WSN). The proposed system consists of a lightweight and low power wireless ECG acquisition and processing device, connected to a central monitoring st...

Virtual instrumentation is one of the major development resulted from the extensive use of computers, which offers the benefits of customizable software development of user-defined tools for control, process, and visualization of data, creating versatile systems, using modular programming, intuitive and easy to use. In this paper we present the dev...

This paper describes the realization of a wireless oxygen saturation and heart rate system for patient monitoring in a limited area. The proposed system will allow the automatic remote monitoring in hospitals, at home, at work, in real time, of persons with chronic illness, of elderly people, and of those having high medical risk. The system can be...

More and more, daily stress is making place in our life. Lack of physical activity, lack of psychical and mental relaxation is lowering our resistance to the stimuli, perturbing our internal harmony and can be a cause for serious diseases. As response, our body reflects the stress as different physiological changes, which can be measured and monito...

Medical images are increasingly being used within healthcare for diagnosis, planning treatment, guiding treatment and monitoring disease progression. Technically, medical imaging mainly processes uncertain, missing, ambiguous, complementary, inconsistent, redundant contradictory, distorted data and information has a strong structural character. As...

The current common goal in medical services and medical information technology is finding solutions for reducing response time of medical treatment, earlier diagnosis, increasing the accuracy of long-time monitoring for people with medical disorders or during recovery from an acute event or surgical procedure, providing an enhancement of their qual...

Telemedicine and e-health solutions provide (chronic) patients and elderly people services that enhance their quality of life. Advances in wireless sensor network technology and the overall miniaturization of their associated hardware low-power integrated circuits have enabled the design of low-cost, miniature and precise physiological sensor modul...

In this paper we present the realization of a wireless low power pulse oximetry telemonitoring system capable to measure and transmit patient's arterial blood-oxygen saturation (SpO2) level and heart rate (HR). The use of the proposed system is suitable for continuous long-time patient monitoring, as a part of a diagnostic procedure. The patient ca...

In the last years the demographic changes and ageing of population increase health care demand. Increasing number of chronic patients and elders requires close attention to their health conditions. In this paper we present the realization of a wireless monitoring system capable to measure process and transmit patient's physiologic signals (electroc...

In this paper we present the realization of a remote blood pressure and heart rate monitoring system, based on wireless devices, capable to measure and transmit patient's arterial blood pressure and heart rate. The use of the proposed system is suitable for continuous long-time patient monitoring, as a part of a diagnostic procedure. The patient ca...

This paper presents the conceptualization and implementation of an e-learning platform for medical telesurveillance and rehabilitating patients with neurological and speech dysfunctions, such as learning disorders, dyslexia, dyspraxia, and dyscalculia.

The study aims at assessing the differences between motor reaction times (RTs) recorded in young as a function of gender and three types of visual lexical tasks, using a patented psycho-verbal stimulation interface. The experiment was conducted in two groups of 25 men and 25 women, between 19–23 year old, students and employees with secondary educa...

The current common goal in medical information technology to-day is the design and implementation of telemedicine solutions, which provide to patients services that enhance their quality of life. Advances in wireless sensor network technology, the overall miniaturization of their associated hard-ware low-power integrated circuits and wireless commu...

This paper presents a Romanian telemedical project that has as goals researches, design and implementation of an electronic-informatics-telecom and scalable system, that allows the automatic and complex telemonitoring, everywhere and every time (at home, in hospitals, at work, of mobile subject, etc), in (almost) real time, of the vital signs of pe...