Michael Gouzman | SUNY: Stony Brook University (original) (raw)

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Papers by Michael Gouzman

With the aging of the baby boomers, it is predicted that the US population over age 65 will grow ... more With the aging of the baby boomers, it is predicted that the US population over age 65 will grow from its 1999 level of 34.6 million persons to approximately 82 million in 2050, a 137% increase. The most rapid surge in our senior population will take place between 2011 and 2030. During this 19-year interval, seniors will expand from 13% of our population to 22% of our population. In this project, our goal is to design a wireless sensor system, the Health Tracker 2000, that can monitors users' vital signs and notifies relatives and medical personnel of their location during life threatening situations. The Health Tracker 2000 combines wireless sensor networks, existing RFID (Radio Frequency Identification) and Vital Sign Monitoring technology to simultaneously monitor vital signs while keeping track of the users' location. The use of wireless technology makes it possible to install the system in all types of homes and facilities. Radio frequency waves can travel through walls and fabric, sending the vital sign and location information to a central monitoring computer via a miniature transmitter network. Such information can easily be accessed from any location over the Internet.

Hydrogen is considered a promising candidate for energy storage. We investigated the cleanest way... more Hydrogen is considered a promising candidate for energy storage. We investigated the cleanest way for hydrogen production by direct photo electrolysis of water with GaN/AlGaN based p-n structures used as working electrodes. Besides the H 2 production rate, an important consideration is the material etching (corrosion) that accompanies the photo-electrochemical process. The GaN-based structures were grown on sapphire substrates by the chloride hydride vapor phase epitaxy and used as a photo anode immersed into an aqueous electrolyte. For a p-n GaN/AlGaN structure we observed a H 2 production rate of 0.6 mL/cm 2 ×h. Corrosion of the electrode proceeds in two steps. First, there is a near vertical etching process, which is associated with defects in the material and penetrates deep into the structure. Subsequently, the process involves etching of n-type layers in lateral direction resulting in the formation of voids and cavities. The lateral etching is due to net positive charges arising from the spontaneous and piezoelectric polarization in the structure and positively charged ionized donors in the space charge region of the p-n junction.

Solid-State Electronics, 2019

Power grids are distributed over vast geographical areas and have sophisticated multilayered arch... more Power grids are distributed over vast geographical areas and have sophisticated multilayered architecture. The structure of the grid distribution layer is often poorly documented and sometimes unknown, presenting additional challenges to the development of systems for automated monitoring of power delivery to consumers. The proposed system performs the simultaneous functions of estimating the power grid topology (map) and monitoring of the grid operation. The core of the system is the distributed network of sensors installed at the branching points of electrical conductors. The sensors periodically measure the RMS current in the conductor, and the phase shift between current and voltage. Localization and time synchronization of sensors are performed using GPS modules. The sensors communicate over the powerline conductor. Transformers block communication signals, separating the network into clusters. The maps of the grid segments are reconstructed for each network cluster and then combined into the full grid map. The map is used for real-time monitoring of inconsistencies in the grid behavior to detect conductor breakage, powerline overload and possibly electricity theft. The autonomous sensors are inductively powered; auxiliary solar cells are installed as backup power source.

International Journal of High Speed Electronics and Systems, 2016

Hydrogen is considered a promising candidate for energy storage. We investigated the cleanest way... more Hydrogen is considered a promising candidate for energy storage. We investigated the cleanest way for hydrogen production by direct photo electrolysis of water with GaN/AlGaN based p-n structures used as working electrodes. Besides the H2 production rate, an important consideration is the material etching (corrosion) that accompanies the photo-electrochemical process. The GaN-based structures were grown on sapphire substrates by the chloride hydride vapor phase epitaxy and used as a photo anode immersed into an aqueous electrolyte. For a p-n GaN/AlGaN structure we observed a H2 production rate of 0.6 mL/cm2×h. Corrosion of the electrode proceeds in two steps. First, there is a near vertical etching process, which is associated with defects in the material and penetrates deep into the structure. Subsequently, the process involves etching of n-type layers in lateral direction resulting in the formation of voids and cavities. The lateral etching is due to net positive charges arising f...

Frontiers in Electronics - Proceedings of the WOFE-04, 2006

2008 51st Midwest Symposium on Circuits and Systems, 2008

A design of front-end preamplifier for measurement of optical response of photo-detector register... more A design of front-end preamplifier for measurement of optical response of photo-detector registering light produced by semiconductor scintillator is presented. The designed preamplifier is based on a current mode, regulated cascode (RGC) structure. A comparison with a previously reported common gate (CG) structure is provided. The experimental prototype was designed in 0.5µm CMOS process. With a 5 V power supply, total power consumption of a chip is 7.5mW. With 50 pF input capacitance and 100 nA leakage current of interfaced photodetector, the equivalent noise charge (ENC) is 8000.

ELECTROPHORESIS, 2003

Recently, we developed a family of high‐performance automated capillary DNA sequencing instrument... more Recently, we developed a family of high‐performance automated capillary DNA sequencing instruments based on a single‐photon detection of fluorescently labeled DNA fragments. Our machines employ digital and broadband techniques, essential for achieving superior instrument sensitivity and dynamic range. In the present paper, we discuss limitations of the instrument's performance caused by the nonlinearity of single‐photon detectors as well as methods for nonlinearity compensation which increase the detection dynamic range and base‐calling accuracy.

An automated ultra-sensitive single-lane DNA sequencer based on single photon counting fluorescen... more An automated ultra-sensitive single-lane DNA sequencer based on single photon counting fluorescent detection technique has been developed and tested. The instrument is intended for individual researchers who carry out a limited number of sequencing experiments (about 10 6 bp/year, the size typical for small-scale research projects). Due to the use of single photon detection, sensitivity of the instrument is about 100 fold higher than in commercial ABI instruments. The sequencer has a flexible modular fiber-optic design and can be easily configured to operate with different laser sources, as well as various fiberized photodetectors. A novel automation concept providing the ability of the remote (Internet) access and control of the system has been implemented and tested for DNA sequencing and fragment analysis applications. Optimization of sample running protocol enabled up to 12 hours of continuous operation without polymer replacement for standard ABI sequencing chemistry and reagents.

2010 IEEE Long Island Systems, Applications and Technology Conference, 2010

A shortcoming of the contemporary power grid monitoring is that the system does not know its own ... more A shortcoming of the contemporary power grid monitoring is that the system does not know its own state. Instead of taking automatic note of energy-flow disruptions, one deals with haphazard telephone reports of "no light in our house". We propose a novel monitoring system that requires no restructuring of the power distribution network and can be applied both to the existing grids and the future "smart grids". The proposed system is based on a network of inexpensive sensors, installed on every connecting line and communicating measured data to a central processing unit. Our approach is topological in nature, based on the connectivity aspects of the power grid embodied in Kirchhoff's current law that must be valid at every node of the network. We argue that the state of the network can be adequately characterized by specifying the RMS currents and the direction of energy flow in all connecting lines. It is essential that in this description one does not have ...

Solid-State Electronics, 2019

International Journal of High Speed Electronics and Systems, 2016

Hydrogen is considered a promising candidate for energy storage. We investigated the cleanest way... more Hydrogen is considered a promising candidate for energy storage. We investigated the cleanest way for hydrogen production by direct photo electrolysis of water with GaN/AlGaN based p-n structures used as working electrodes. Besides the H2 production rate, an important consideration is the material etching (corrosion) that accompanies the photo-electrochemical process. The GaN-based structures were grown on sapphire substrates by the chloride hydride vapor phase epitaxy and used as a photo anode immersed into an aqueous electrolyte. For a p-n GaN/AlGaN structure we observed a H2 production rate of 0.6 mL/cm2×h. Corrosion of the electrode proceeds in two steps. First, there is a near vertical etching process, which is associated with defects in the material and penetrates deep into the structure. Subsequently, the process involves etching of n-type layers in lateral direction resulting in the formation of voids and cavities. The lateral etching is due to net positive charges arising f...

Frontiers in Electronics - Proceedings of the WOFE-04, 2006

2008 51st Midwest Symposium on Circuits and Systems, 2008

ELECTROPHORESIS, 2003

2010 IEEE Long Island Systems, Applications and Technology Conference, 2010