Applications: Activity Sensing. Spencer Kaiser, Laurel Khaleel, and Jake Drew Ubiquitous Computing Southern Methodist University
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1 Applications: Activity Sensing Spencer Kaiser, Laurel Khaleel, and Jake Drew Ubiquitous Computing Southern Methodist University
2 Want To Play A Game???
3 Researcher or Criminal?
4 Researcher or Criminal? Criminal Researcher Ted Bundy Boštjan Kaluža
5 Researcher or Criminal?
6 Researcher or Criminal? Criminal Researcher Frank Abagnale Radoje Milic
7 Researcher or Criminal?
8 Researcher or Criminal? Researcher Criminal Matjaž Gams Sydney Biddle Barrows
9 Ensembles of Multiple Sensors for Human Energy Expenditure Estimation Authors: Hristijan Gjoreski Boštjan Kaluža Matjaž Gams Radoje Milic Mitja Luštrek Sports faculty interested in measuring expenditure for athletes
10 Research Overview Human Energy Expenditure (EE) directly reflects the level of physical activity. Actual EE is unpractical to measure outside of the laboratory. Find better ways to estimate EE measuring physical activity with various accelerometers and sensors. Previous regression models were created by activity. This research uses an ensemble of regression models for EE estimation which are trained using the output of multiple sensors.
11 Question How might sports faculty affordances for wearable sensor types and the number of sensors worn be different from other individuals researching energy expenditure or activity sensing?
12 Energy Expenditure Calorimetry derives the heat transfer associated with changes of its state due for example to chemical reactions, physical changes, or phase transitions under specified constraints. Calorimetry is typically performed with a calorimeter. Direct Calorimetry measures the total heat output of a person. (Not practical outside of the laboratory) Indirect Calorimetry analyzes respiratory gasses which requires a breathing mask. Another approach uses doubly labeled water with marked isotopes which are used to trace the water s movement throughout the body. (less accurate, but more convenient)
13 Cardiopulmonary and Metabolic Testing Metabolic systems measure breath by breath or mixing chamber oxygen consumption, carbon dioxide production, minute ventilation, anaerobic threshold detection, flow volume loops, lung subdivisions, and maximal voluntary ventilation.
14 Maximal Oxygen Uptake (VO2Max) Measures the maximum rate of oxygen consumption. It is used to measure the functional capacity of the heart, which is a strong indicator of cardiorespiratory fitness. Determined by measuring oxygen and carbon dioxide content in inhaled/exhaled air while continually increasing the intensity of an exercise. Occurs at the point at which oxygen consumption no longer increases despite additional increases to intensity.
15 Resting Energy Expenditure (REE) Resting Energy Expenditure (REE) is the number of calories burned at rest per day. REE provides the total caloric expenditure in 24 hours and is calculated from the gas exchange data collected by the VIAYSIS VMAX metabolic system.
16 Pulmonary Function Tests (PFT) Spirometric pulmonary function tests include tests such as forced vital capacity (FVC), forced expiratory volume in one second (FEV1), flow volume loops, and maximal voluntary ventilation (MVV).
17 Six Minute Walk Test (6MWT) VO2max can be estimated from 6MWT results using multivariate equations. This test can be performed by elderly and patients who can not be tested with standard treadmill exercise equipment.
18 Quark CPET State-of-the-art breath by breath gas exchange data analysis (VO2, VCO2) Fast response paramagnetic O2 sensor Optional 7-liter mixing chamber (either for low or high ventilation ranges) Fully integrated 12-lead ECG for Stress Testing (option) Nutritional assessment with face mask or optional canopy hood Full spirometry and optional exercise SpO2 monitoring
19 Actigraphy Actigraphy is a non-invasive method of monitoring human rest/activity cycles. A small actigraph unit, also called an actimetry sensor,[1] is worn by a patient to measure gross motor activity. The data can be later read to a computer and analyzed offline. In some applications, such as the Fitbit, the data is transmitted and analyzed in real time Moderately accurate and cost is an issue. FitBit $99.00
20 Experiment Sensors Shimmer three-axis accelerometer Zephyr BioHarness sensor Cosmed indirect calorimeter BodyMedia SenseWear sensor Baseline EE Benchmark (METs) Current State of the Art
21 Question Why do these sensors limit the application of their results only to athletes and people highly into the quantified self movement? How they could have made the experiments generalizable to a wider audience?
22 Sensor Features
23 Activities Measured By Cosmed Indirect Calorimeter
24 Features for Training Ensemble Models Activity (A) Class label that was being predicted, including a MET value for training. Acceleration Peaks (AP) Count of changes in the direction of acceleration numbers Heart Rate (HR) Discretized raw sensor data Breath Rate (BR) - Discretized raw sensor data Chest Skin Temperature (CST) - Discretized raw sensor data Galvanic Skin Response (GSR) - Discretized raw sensor data Arm Skin Temperature (AST) - Discretized raw sensor data Ambient Temperature (AT) - Discretized raw sensor data Called Context Components Values are divided into similar sized bins.
25 Creating Model Ensembles 1,000,000 Raw Data Samples Per Volunteer Four Machine learning methods were tested: linear regression, Gaussian processes, multilayer perceptron (artificial neural network) and SMOReg (support vector regression) Four models were created for each of the seven Context Components or Features which were divided into discretized bins each. 4 Methods * 4 Discretized Bins * 7 Context Components = 112 Total Models! Each time a prediction was made, 7 models were selected for the prediction based upon the same discretized bins created during training. Each of the 7 model s MET predictions were combined (using average, median, or other) to estimate the final EE.
26 Model Validation A leave-one-person-out cross-validation technique was used Models were trained on the data of nine people and tested on the remaining person Procedure was repeated ten times, for each person Mean Absolute Percentage Error (MAPE) - The mean absolute error divided by the true value was used for evaluation. MAPE is the most common metric in the EE estimation domain
27 Results To evaluate results, they compared against four standard regression methods: Linear Regression Gaussian Processes SMOReg (support vector regression) Multilayer Perceptron (artificial neural network) The Ensemble significantly outperformed the baseline and the SenseWear across all four regression methods
28 Results The authors also chose to demonstrate results on a context basis Overall, the MAPE of the Ensemble across all contexts greatly out-performed the MAPE of individual contexts The whole is greater than the sum of its parts. - Aristotle
29 Results Lastly, the authors compared estimated MET values against true MET values for a variety of activities and placed the values on a scatterplot The results indicate that the Ensemble s estimations better match the actual Cosmed MET values than those of the other two approaches The SenseWear is intended to be used for dynamic activities which is likely why it performed better for those activities and worse for day-to-day activities
30 Discussion Questions The results in this paper seem pretty straight-forward to me. More sensors and better algorithms mean that the estimation will be better. Is that conclusion common sense? Is writing a paper to prove that valuable to ubicomp research?
31 Discussion Questions Is it practical to include this many sensors to measure EE?
32 Dog s Life: Wearable Activity Recognition for Dogs Thomas Ploetz Cassim Ladha Emma Hughs Patrick Oliver Nils Hammerla
33 Brief Overview communicative behaviors specific moods, desires, or intentions of the animals Comprised of movements that demonstrate the body language of the dog response behaviors last for a short period of time and are usually a response to stimuli Certain behaviors have been shown to be indicative of disease and pain A dog s head plays a key role in most of its normal activities
34 Activity Sensing Platform Using a wearable accelerometry sensing platform Platform: AX3 accelerometer Axtivity 3 axis accelerometer Contains an accelerometer and microcontroller Sensor attached to a dog collar Records a continuous stream of data
35 Experiment 18 dogs 6 female/12 male 2 small/5 med/9 large 13 breeds 17 activities (70% classification accuracy) and 16 behavior traits Participants (dog owners) put the collar with the sensor on their dog to record daily activities Owners also given a video camera to help validate the results of the collar Dogs mostly left alone except where stimulation was needed Experiment in compliance with the UK s ASPA regulations
36 Behaviors and Triggers
37 Results Overview Overall recognition activity of 68.6% Much of the inaccuracy is for walking Stationary activities easier to detect Results generally more accurate for smaller dogs
38 Confusion Matrices
39 Voyce Basically a fitbit for dogs Measures steps, rest, heart, and respiratory rates Can help to show if a dog is sick Comes in a collar $300 plus subscription fee video
40 Interpretation All the dogs in the study were healthy ; how would results differ from unhealthy dogs? Is ~70% accuracy high enough to detect a noticeable difference in abnormal activity? Why did they choose these activities? Did gender affect results in any way? Did the ages of the dogs vary significantly? (ie. puppy vs. old dog)
41 Weaknesses Well being not detected, only activities Results not very clearly explained Experiments were short term Activities collected could have been presented in a tabular format Study heavily dependent on owners could potentially bias the data
42 Discussion Questions Is 70% a high enough reliability for an emerging device? Does the reliability threshold change when the user is a dog and not a human?
43 Discussion Questions What would a system like this cost? Would most people be willing to pay for a system like this for their dog?
44 Thank You!
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