Blood Pressure Continuous Measurement through a Wearable Device: Development and Validation of a Cuffless Method

The present study aims to develop and validate a cuffless method for blood pressure continuous measurement through a wearable device. The goal is achieved according to the time-delay method, with the guiding principle of the time relation it takes for a blood volume to travel from the heart to a peripheral site. Inversely proportional to the blood pressure, this time relation is obtained as the time occurring between the R peak of the electrocardiographic signal and a marker point on the photoplethysmographic wave. Such physiological signals are recorded by using L.I.F.E. Italia’s wearable device, made of a sensorized shirt and wristband. A linear regression model is implemented to estimate the corresponding blood pressure variations from the obtained time-delay and other features of the photoplethysmographic wave. Then, according to the international standards, the model performance is assessed, comparing the estimates with the measurements provided by a certified digital sphygmomanometer. According to the standards, the results obtained during this study are notable, with 85% of the errors lower than 10 mmHg and a mean absolute error lower than 7 mmHg. In conclusion, this study suggests a time-delay method for continuous blood pressure estimates with good performance, compared with a reference device based on the oscillometric technique.

List Point Marker Path Finding for Artificial Intelligence Movement in 3D Games

In making a path finding algorithm in a 3D game to determine the direction of the NPC agent towards the destination, the Djiksra algorithm, Depth First Search, Breadth First Search and so on, usually the shortest distance is directly proportional to the travel duration to the target point. In this study, a test will be made using a list marker point such as the Djiksra algorithm to get the shortest distance and fastest time to reach the destination, in making this algorithm the C# language is used and the Unity software is used. After experimenting with various list points in different places in two directions, it was found that the distance traveled is always directly proportional to duration. So the selection of the fastest or shortest path can be done with this list point marker algorithm.

The Human walking kinematic model combined with upper and lower limb movement

The purpose of this study is to build a relatively complete human walking kinematic model. This model is combined with the rolling-foot model (lower limb) and multi-rod swinging model (upper limb) connected by COM. We calculated the velocity of COM and other critical joints of the upper limb by marker point capture experiment using the high-speed camera. This research shows that the hand joint velocity measured through the experiment can achieve high coincidence with that calculated by the theoretical model given specific inputs. Moreover, the common pattern of upper limb angles is also studied for an accurate description. The proposed kinematic model is expected to forecast desired motion intention for better compliance by the rehabilitation and assistive robots.

Point markers in replacement of odometer driven positioning: effects and possible problems

<p>It is widely known that, in GPR prospecting [1-2], sometime it is not possible to make use of the customary odometer for the recording of the position of the measurement points along the observation line. Consequently, in these cases the human operator is compelled to make use of point markers placed at known positions (measured with a tape) along the observation line. In particular, this can happen on the sand of a desert and on the polar ice [3], but it might happen also just due to some ill-functioning of the odometer. Notwithstanding, quite rarely the effects of the use of the point markers have been examined on the basis of some experimental test. At the conference, we will show an experiment where the same observation line has been gone through several times, first making use of the odometer included in the exploited GPR system and then making use of marker points. A third time, the same path was still travelled without odometers and taking the marker points without making use of any laptop command. These were replaced just by stopping for some seconds the GPR in any marker point (but keeping it switched on). This option can be useful in cases where e.g. the command has to be given through a touchscreen. The observation line was 15 m long, and was placed on a flat smooth and tough floor. This means that the line offered favourable conditions for the use of the odometer, and so the positions of the anomalies identified making use of the odometer are considered as the correct positions of the buried targets. This has allowed a quantification of the displacements from the correct position of the buried anomalies when making use of marker points taken with a step of one meter from each other. A  larger and deeper dealing is available in [4].</p><p><strong>References</strong></p><p>[1] R. Pierri, G. Leone, F. Soldovieri, R. Persico, "Electromagnetic inversion for subsurface applications under the distorted Born approximation" Nuovo Cimento, vol. 24C, N. 2, pp 245-261, March-April 2001.</p><p>[2] R. Persico, M. Ciminale, L. Matera, A new reconfigurable stepped frequency GPR system, possibilities and issues; applications to two different Cultural Heritage Resources, Near Surface Geophysics, vol. 12, n. 6, pp. 793-801 (doi: 10.3997/1873-0604.2014035), December 2014.</p><p>[3] H. Jol, Ground Penetrating Radar: Theory and applications, Elsevier, 2009.</p><p>[4] R. Persico, <strong>Ground Penetrating Radar: Physics and Practical Aspects, </strong>Springer Handbook of Cultural Heritage Analysis, edited by Sebastiano D’Amico and Valentina Venuti, Springer, 2020.</p>

PENGEMBANGAN MEDIA INFORMASI RUANG KULIAH PADA FAKULTAS TEKNIK UNIVERSITAS PALANGKA RAYA BERBASIS ANDROID DAN LOCATION BASED SERVICE

Android is a widely used of technology. Location Based Service (LBS) is an android feature to find the location of user’s device by utilizing satellite facilities. Problems faced by the students in Informatics of Faculty of Engineering are the limited number of lecturing rooms and the lack information of the use of those rooms. LBS feature on android will answer those existing problems. The methodology for development is Prototype by Pressman which has saveral stages namely (1) communication and initial data collection, (2) quick design, (3) formation of prototype, (4) evaluation of prototype, (5) improvement of prototype and (6) final production. Flowchart is made at analysis stage as well as Unified Modeling Language (UML) at the design stage. The language programs are Java, JSON, SQLite. Map plans are designed through Google Earth Pro and Edraw Max 7 placed on the Google Map API where data storage is made in the Firebase and SQLite online databases as local databases with application development created by Android Studio. Application of Location Based Service (LBS) in Faculty of Engineering of University of Palangka Raya is applied the Google Map API by each marker point being made which generates various radius. When the application user enters into each radius, it will produce a notification of room information that contains lectures taking place in the rooms. Therefore, the rooms associated with lectures is identified

Product Blind Area Assembly Method Based on Augmented Reality and Machine Vision

In the manual assembly of the blind area, the worker's line of sight is blocked, and the real-time state of the parts to be assembled cannot be seen, which has a great impact on the efficiency and accuracy of the assembly. Aiming at this problem, a blind zone assembly method based on machine vision and augmented reality(AR) is proposed. Firstly, the ellipse is used as the marker point. The object to be assembled in the blind area is indirectly tracked by the detection and positioning of the ellipse, and the AR visualization guide assembly is then performed by projection and the assembly is precisely guided using the principle of local error amplification. Finally, the blind zone assembly experiment based on machine vision and augmented reality is designed to verify the effectiveness of the method. The experimental results show that this method can significantly improve the efficiency of assembly work in blind areas and can effectively reduce the assembly error rate.

An Examination of Changes in Bat Flight Kinematics During Take Off

The powered flight of bats is unique in nature because of the agility that it allows them to achieve in comparison to other flying animals of equivalent size. One example of this is a bat’s ability to take off with no initial freestream velocity and transition to cruising flight over the duration of relatively few wing beat cycles. Bat’s wings are highly complex and have 20+ degrees of freedom (DOFS) per wing. Adjustments to several of these DOFS occur to allow for quick transition to cruising flight. In order to capture this transition in wing motion, video of Great Himalayan Leaf-Nosed Bats (Hipposideros Armiger) was captured over a period that included both take off and cruising flight. Images captured using a multi-camera setup, containing three rings of 10 RGB cameras each, were used in conjunction with triangulation techniques to capture the 3D coordinates of marker points on the wing. This setup eliminated the point dropout that can occur due to occlusion in traditional 2 camera systems due to its 360 degree coverage. Furthermore, the redundancy caused by collecting 3 or more 2D marker point projections from some of the 10 cameras per ring improved accuracy of the 3D coordinates. In order to capture the transition in wing kinematics, changes in flap amplitude, velocity, and frequency, were recorded. The data suggests that this species of bat utilize a change in flap amplitude as the primary means to transition from takeoff to cruising flight while keeping other parameters such as angle of attack and flap frequency constant.

Cardiac marker point-of-care testing in the Emergency Department and Cardiac Care Unit

There has been much interest in improving the accuracy and speed with which chest pain patients presenting to the emergency department are diagnosed and treated. Recently, attention has been directed toward alternative site or point-of-care testing for biochemical markers of myocardial cell necrosis in addition to traditional diagnostic methodologies. The various point-of-care cardiac marker devices available and their potential applications are discussed. Regulatory and quality management issues related of point-of-care testing are reviewed.

Image Corrected Cephalometric Analysis (ICCA): Design and Evaluation

Image corrected cephalometric analysis (ICCA) Is a method for eliminating serial image parallax error. In a radiographic survey, image parallax is an inherent and random property of the two-dimensional Image of the subject. Radiographs of the same subject taken at different times will be different in image parallax. This difference, parallax error, is routinely displayed between serial radiographic studies. Parallax error discourages the use of conventional serial cephalometric surveys for tracking and studying changes in discrete craniofacial structures lying outside the midsagittal plane, unilaterally disposed, or changing without bilateral symmetry. Anatomic outlines or discrete points of such structures would routinely display measurement perturbations caused by image parallax differences between surveys. The ICCA method eliminates this problem. Therefore, accurate serial measurements of bone marker point displacements are made possible with two-dimensional reconstructions of points lying in three-dimensional space. The method of ICCA was tested for accuracy by using zero time serial cephalometric surveys of five subjects. Mean implant error of 0.12 mm (SD = 0.1) was found between predicted (ICCA) and actual measured Implant movement caused by the image parallax error. After applying this method, bone marker movements are unlikely to be caused by parallax error between conventional serial cephalometric studies. Furthermore, displacement growth can be related to the relocation of composite growth outlines and midline anatomic landmarks. One plagiocephaly case and one hemifacial microsomia case were used to demonstrate ICCA for growth and treatment effect documentation.