Publications
[9] H. Lin, Y. Zhao, S. Lin, B. Wang, C. Yeung, X. Cheng, Z. Wang, T. Cai, W. Yu, K. King, J. Tan, K. Salahi, H. Hojaiji, S. Emaminejad, "A Rapid and Low-cost Fabrication and Integration Scheme to Render 3D Microfluidic Architectures for Wearable Biofluid Sampling, Manipulation, and Sensing", Lab on a Chip, DOI: 10.1039/C9LC00418A, 2019.
[8] B. Wang, Y. Zhao, H. Hojaiji, M. Kim, and S. Emaminejad, “Wearable Enzymatic Sensor", Presented at Miniaturized Systems for Chemistry and Life Sciences (MicroTAS 2019), Basel, Switzerland, October 2019.
[7] Y. Zhao, H. Hojaiji, and S. Emaminejad, “Electrochemically-Functionalized and Vertically Conductive Adhesive Tapes for Wearable Sweat Biomarker Monitoring”, Presented at Hilton Head 2018: A Solid State Sensors, Actuators & Microsystems Workshop, Hilton Head, SC, June 2018.
[6] S. Pilehvar, S. Lin, H. Hojaiji, Y. Zhao, and S. Emaminejad, “A Highly Sensitive Impedimetric Aptasensor for Wearable Detection of Hormones”, Presented at Hilton Head 2018: A Solid State Sensors, Actuators & Microsystems Workshop, Hilton Head, SC, June 2018.
[5] H. Lin, S. Lin, Y. Zhao, H. Hojaiji, S. Pilehvar, S. Thakur, M. Karapetian, K. King, R. Frias, and S. Emaminejad, “A Fully-Integrated Wearable Microfluidic Actuation and Sensing Platform for Biomarker Analysis”, Presented at Hilton Head 2018: A Solid State Sensors, Actuators & Microsystems Workshop, Hilton Head, SC, June 2018.
[10] H. Lin§, H. Hojaiji§, S. Lin§, C. Yeung, Y. Zhao, B. Wang, M. Malige, Y. Wang, K. King, W. Yu, J. Tan, Z. Wang, X. Cheng, S. Emaminejad, "A Wearable Electrofluidic Actuation System", Lab on a Chip, DOI: 10.1039/C9LC00454H, 2019. [§] These authors contributed equally.
[11] H. Lin§, H. Hojaiji§, S. Lin§, C. Yeung, Y. Zhao, B. Wang, M. Malige, Y. Wang, K. King, W. Yu, J. Tan, Z. Wang, X. Cheng, S. Emaminejad, "A Fully Integrated Wearable AC Electrothermal Actuation Platform for Biofluid Manipulation", Presented at Miniaturized Systems for Chemistry and Life Sciences (MicroTAS 2019), Basel, Switzerland, October 2019. [§] These authors contributed equally.
[12] S. Lin, B. Wang, Y. Zhao, R. Shih, X. Cheng, W. Yu, H. Hojaiji, H. Lin, C. Hoffman, D. Ly, J. Tan, Y. Chen, D. Di Carlo, C. Milla, and S. Emaminejad, "Natural Perspiration Sampling and In-Situ Electrochemical Analysis with Hydrogel Micropatches for User-Identifiable and Wireless Chemo/bio-sensing", ACS Sensors, DOI: 10.1021/acssensors.9b01727, 2019. (featured in "Most Read Articles", ACS Editors’ Choice)
[13] X. Cheng, B. Wang, Y. Zhao, H. Hojaiji, S. Lin, R. Shih, H. Lin, S. Tamayosa, B. Ham, P. Stout, K. Salahi, Z. Wang, C. Zhao, J. Tan, and S. Emaminejad, "A Mediator-free Electroenzymatic Sensing Methodology to Mitigate Ionic and Electroactive Interferents’ Effects for Reliable Wearable Metabolite and Nutrient Monitoring", Advanced Functional Materials, DOI: 10.1002/adfm.201908507, 2019.
[14] S. Lin, B. Wang, W. Yu, K. Castillo, C. Hoffman, X. Cheng, Y. Zhao, Y. Gao, Z. Wang, H. Lin, H. Hojaiji, J. Tan, and S. Emaminejad, "A Design Framework and Sensing System for Non-invasive Wearable Electroactive Drug Monitoring", ACS Sensors, DOI: 10.1021/acssensors.9b02233, 2019. (featured in "Most Read Articles")
[15] Y. Zhao§, B. Wang§, H. Hojaiji, Z. Wang, S. Lin, C. Yeung, H. Lin, P. Nguyen, K. Chiu, K. Salahi, X. Cheng, J. Tan, B. A. Cerrillos, S. Emaminejad, "A Wearable Freestanding Electrochemical Sensing System", Science Advances, 2019 (in press). [§] These authors contributed equally.
[4] A. Hosseini, C.M. Buonocore, S. Hashemzadeh, H. Hojaiji, H. Kalantarian, C. Sideris, A.A.T. Bui, C.E. King, M. Sarrafzadeh, “HIPAA compliant wireless sensing smartwatch application for the self-management of pediatric asthma”, In Proc. IEEE Body Sensor Networks Conference, Jun 2016, p. 49-54. (Best Poster Award)
[3] H. Hojaiji, H. Kalantarian, A.A.T. Bui, C.E. King, M. Sarrafzadeh, "Temperature and humidity calibration of a low-cost wireless dust sensor for real-time monitoring", Proc. of 2017 IEEE Sensors Applications Symposium, pp. 1-6, 2017. (Paper presented at IEEE SAS (NJ, USA), and won Student Grant Award)
[1] A. Hosseini, C.M. Buonocore, S. Hashemzadeh, H. Hojaiji, H. Kalantraian, C. Sideris, A.A.T. Bui, C.E. King, M. Sarrafzadeh, "Feasibility of a Secure Wireless Sensing Smartwatch Application for the Self-Management of Pediatric Asthma", Sensors, 2017, 17, 1780. (Selected Front Cover)
[2] H. Hojaiji, O. Goldstein, C.E. King, M. Sarrafzadeh, M. Jerrett, “Design and Calibration of a Wearable and Wireless Research Grade Air Quality Monitoring System for Real-Time Data Collection”, IEEE Global Humanitarian Technology Conference, July 2017.
Awards & Certificates
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Selected for the HRL Fellowship
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Northrop Grumman Fellowship
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The Best Poster Award in the UCLA ECE Annual Research Review 2019
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Special recognition and Honorable Mention of the National Science Foundation (NSF)
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Honorable Mention Recognition from the National Academies of Sciences (NAS), Engineering, and Medicine
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Christina Huang Memorial Prize in Recognition of Excellent Academic and Research Achievements and Outstanding Service to the UCLA Community
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Engineering Achievement Award for Student Welfare
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ECR Four-Year Fellowship for Electrical and Computer Engineering (Circuits and Embedded Systems)
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Best Poster Award, ECE Annual Research Review at UCLA, 2018
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Asad and Gowhartaj Madni Scholarship in Engineering
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Certified, Obligation of an Engineer, UCLA Ring Ceremony
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Bob & Judy Green Scholarship in Electrical Engineering
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Certificate in Global Entrepreneurship from UCLA Anderson
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Presented at IEEE Sensors Applications Symposium 2017 (First Author-Won Student Grant Award)
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Officer and Member of Eta Kappa Nu-IEEE Honor Society
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Best Supplemental Instructor Santa Monica College
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Dean’s Honors List, SMC and UCLA (Fall 2012-Spring 2017)
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Member of Phi Theta Kappa Honor Society
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Certified for Human Subjects Research, FDA Regulated Research, and UCLA HIPAA Compliant Research
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Best Piano Player Award under the supervision of Tehran and Moscow Conservatories
Overview of Highlighted Research Projects
I’m thrilled to invite you to review my past work, design skills, and professional experience to learn more about me.
It’s my firm belief that a good challenge offers an opportunity to develop and improve, that is why I am continuously seeking out new challenges in the professional realm as well as in my personal life. Please take a moment and look around, and contact me directly to learn more about the projects.
 Wearable Sensor Designed vs Dylos Sensor Controlled Testing and Calibration |
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 Wearable Sensor Designed vs Dylos Sensor Real-Time Indoor Testing |
 Wearable Sensor vs Dylos Sensor Real-Time Outdoor Testing |
 Graph Obtained from Android Application Designed (on the right) vs Professional Sensor's Software ( |
 Wearable Sensor Designed |
Design and calibration of a wearable and wireless research grade air quality monitoring system for real-time data collection
In this paper, I introduce the design, calibration, and validation of a wearable, wireless, and secure air quality monitoring sensor system that is integrated with a smartphone application and back-end server for real-time data collection. To this end, an Alphasense OPC-N2 optical air quality monitoring sensor was integrated with a wireless hardware platform and real-time smartphone application, which sent particulate matter data securely to a back-end server in real time for researchers to be able to monitor and perform in depth analyses.
 Custom-developed smartwatch for single on-body sensing application |
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 Wearable electrofluidic actuation system for advanced bioanalytical operations |
Biomarker Monitoring Platforms
Currently working on designing wearable biomarker monitoring platforms leveraging analog and digital circuits for personalized and precision medicine.
Here is a wearable electrofluidic actuation system, which exploits the alternating current electrothermal (ACET) effects to engineer biofluid flow profiles on the body. The demonstrated capabilities rendered by the presented system create new degrees of freedom for implementing advanced bioanalytical operations for future lab-on-the-body platforms.
 Calibrated Sensor Matching Professional Sensor |
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 Calibrated Sensor vs Professional Sensor Under Changing Temperature and Humidity |
 Sensor vs Professional Sensor Controlled Testing Before Calibration |
 Testing Sensor Before Calibration |
 Dust Sensor Designed |
Temperature and Humidity Calibration of a Low-Cost Wireless Dust Sensor for Real-Time Monitoring
This paper introduces the design, calibration, and validation of a low-cost portable sensor for the real-time measurement of dust particles within the environment. The proposed design consists of low hardware cost and calibration based on temperature and humidity sensing to achieve accurate processing of airborne dust density. Using commercial particulate matter sensors, a highly accurate air quality monitoring sensor was designed and calibrated using real-world variations in humidity and temperature for indoor and outdoor applications.