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Search Publications

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Displaying 1 - 25 of 128

Wireless Channel Characterization for UWB Communication in Capsule Endoscopy

August 30, 2023
Author(s)
Katjana Ladic, Kamran Sayrafian, Dina Simunic, Kamya Yazdandoost
Since its invention in the early 1990s the technology behind capsule endoscopy has been making rapid progress. The emergence of high-resolution miniature video cameras along with other microsensor technology have increased the data rate and power

Scalable Modeling of Human Blockage at Millimeter-Wave: A Comprehensive Analysis of Knife-Edge Diffraction, the Uniform Theory of Diffraction, and Physical Optics Against 60 GHz Channel Measurements

December 22, 2022
Author(s)
Anmol Bhardwaj, Camillo Gentile, Jelena Senic
Human blockage at millimeter-wave frequencies is most commonly modeled through Knife-Edge Diffraction (KED) from the edges of a vertical strip. Although extensively validated through controlled laboratory experiments, the method does not scale to realistic

Impact of Using Soft Exposure Thresholds in Automatic Contact Tracing

December 21, 2022
Author(s)
Kamran Sayrafian, Brian D. Cloteaux, Vladimir Marbukh
Current automatic exposure notification apps primarily operate based on hard distance/time threshold guidelines (e.g., 2 m/15 min in the United States) to determine exposures due to close contacts. However, the possibility of virus transmission through

Maximizing Harvested Energy in Coulomb Force Parametric Generators

September 5, 2022
Author(s)
Masoud Roudneshin, Kamran Sayrafian, Amir Aghdam
Miniaturized wearable or implantable medical sensors are becoming an important application area for kinetic-based micro energy-harvesters. These harvesters can generate power through the natural human body motion. The architecture based on the Coulomb

A Preliminary Study of RF Propagation for High Data Rate Brain Telemetry

February 11, 2022
Author(s)
Mariella Sarestoniemi, Carlos Pomalaza-Raez, Kamran Sayrafian, Teemu Myllyla, Jari Iinatti
This paper presents the preliminary results of a study on the radio frequency (RF) propagation inside the human skull at several Industrial, Scientific and Medical (ISM) and ultrawideband UWB frequencies. These frequency bands are considered as possible

A Wearable Wireless Monitoring System for the Detection of Pulmonary Edema

February 2, 2022
Author(s)
Kamran Sayrafian, Katjana Krhac, Uzay Bengi, Sema Dumanli Oktar
In this paper we investigate the feasibility of a simple wearable system that can be used at home to detect or monitor excess fluid buildup in the lungs. This is a medical condition referred to as pulmonary edema. A methodology has been developed to

NVLAP Health Information Technology Testing

November 30, 2021
Author(s)
Bradley Moore, Asara Clark
NIST Handbook 150-31 presents the technical requirements and guidance for the accreditation of laboratories under the National Voluntary Laboratory Accreditation Program (NVLAP) Healthcare Information Technology program. It is intended for information and

A Functional BCI Model by the P2731 Working Group: Transducer

September 8, 2021
Author(s)
Kamran Sayrafian, Guillermo Sahonero-Alvarez, Avinash Singh, Luigi Bianchi, Avid Roman-Gonzalez
A Brain-Computer Interface (BCI) can be considered as a technology that allows for alternative means of communication between humans and their environment using thoughts and intentions. The structure of this interface is composed of various stages

On the Quality of the TREC_COVID IR Test Collections

July 11, 2021
Author(s)
Ellen M. Voorhees, Kirk Roberts
Shared text collections continue to be vital infrastructure for IR research. The COVID-19 pandemic offered an opportunity to create a test collection that captured the rapidly changing information space during a pandemic, and the TREC-COVID effort was

In-Body Propagation at ISM and UWB Frequencies for Abdominal Monitoring Applications

July 9, 2021
Author(s)
Mariella Sarestoniemi, Carlos Pomalaza Raez, Kamran Sayrafian, Jari Iinatti
This paper presents the results of an in-body propagation study for abdominal implant communication using a bio-matched mini-horn antenna. The wireless signal coverage in the abdomen area at various ISM and UWB frequency bands are measured using

Workshop Report: Challenges for Digital Proximity Detection in Pandemics: Privacy, Accuracy, and Impact

May 24, 2021
Author(s)
Michelle Stephens, Gregory (Greg) C. Cala, Kristen K. Greene, Katy Keenan, Angela Robinson, Donald Ufford, Zachary Valdez, Lu Shi
NIST held a three-day workshop, "Challenges for Digital Proximity Detection in Pandemics: Privacy, Accuracy, and Impact" Jan. 26th – 28th, 2021. Members of industry, academia, non-profits, state, and federal government were brought together to discuss

Securing Picture Archiving and Communication System (PACS) Cybersecurity for the Healthcare Sector

December 21, 2020
Author(s)
Jennifer L. Cawthra, Sue S. Wang, Bronwyn J. Hodges, Kangmin Zheng, Ryan T. Williams, Jason J. Kuruvilla, Christopher L. Peloquin, Kevin Littlefield, Bob Neimeyer
Medical imaging plays an important role in diagnosing and treating patients. The system that manages medical images is known as the picture archiving communication system (PACS) and is nearly ubiquitous in healthcare environments. PACS is defined by the

Adaptive Estimation of Near-Optimal Electrostatic Force in Micro Energy-Harvesters

September 28, 2020
Author(s)
Kamran Sayrafian, Masoud Roudneshin, Amir G. Aghdam
Recent advancements in micro-electronics have led to the development of miniature-sized wearable sensors that can be used for a variety of health monitoring applications. These sensors are typically powered by small batteries which could require frequent

TREC-COVID: Rationale and Structure of an Information Retrieval Shared Task for COVID-19

July 8, 2020
Author(s)
Ellen M. Voorhees, Ian Soboroff, Tasmeer Alam, Kirk Roberts, William Hersh, Dina Demner-Fushman, Steven Bedrick, Kyle Lo, Lucy L. Wang
TREC-COVID is an information retrieval (IR) shared task initiated to support clinicians and clinical research during the COVID-19 pandemic. IR for pandemics breaks many normal assumptions, which can be seen by examining nine important basic IR research

Output Power Maximization of a Microgenerator Using Machine Learning Approach

December 5, 2019
Author(s)
Kamran Sayrafian, Masoud Roudneshin, Amir G. Aghdam
Wearable medical sensors are one of the key components of remote health monitoring systems which allow patients to stay under continuous medical supervision away from the hospital environment. These sensors are typically powered by small batteries which

A Simulation Platform to Study the Human Body Communication Channel

October 7, 2019
Author(s)
Kamran Sayrafian, Katjana Krhac, Gregory Noetscher, Dina Simunic
Human Body Communication (HBC) is an attractive low complexity technology with promising applications in wearable biomedical sensors. In this paper, a simple parametric model based on the finite-element method (FEM) using a full human body model is
Displaying 1 - 25 of 128