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  Access Rights: Public
 Department: Electrical Engineering
 Collection: UNT Scholarly Works
Electrical stimulation of nerve cell networks growing on microelectrode arrays: stimulation efficiency and entrainment

Electrical stimulation of nerve cell networks growing on microelectrode arrays: stimulation efficiency and entrainment

Date: March 31, 2005
Creator: Jain, Vivek & Gross, Guenter W.
Description: This presentation discusses research on electrical stimulation of nerve cell networks growing on microelectrode arrays. The objective of this study is to characterize stimulation efficiency/entrainment as a function of the following variables: frequency (pulses/trains), pulse durations, and number of pulses/trains. There has been no study done yet that pins down the most effective characteristics of a stimulation pulse train. This research may pave the way for improved communication with networks and studies of information storage.
Contributing Partner: UNT Honors College
Indoor Propagation Modeling at 2.4 GHZ for IEEE 802.11 Networks

Indoor Propagation Modeling at 2.4 GHZ for IEEE 802.11 Networks

Date: April 2006
Creator: Akl, Robert G.; Tummala, Dinesh & Li, Xinrong
Description: This paper discusses indoor propagation modeling. Abstract: The purpose of this study is to characterize the indoor channel for 802.11 wireless local area networks at 2.4 GHz frequency. This work presents a channel model based on measurements conducted in commonly found scenarios in buildings. These scenarios include closed corridor, open corridor, classroom, and computer lab. Path loss equations are determined using log-distance path loss model and log-normal shadowing. The Chi-square test statistic values for each access point are calculated to prove that the observed fading is a normal distribution at 5% significance level. A numerical analysis of measurements in each scenario was conducted and the study determined equations that describe path loss for each scenario.
Contributing Partner: UNT College of Engineering
Autonomous Robot Localization Using WiFi Fingerprinting

Autonomous Robot Localization Using WiFi Fingerprinting

Date: April 14, 2011
Creator: Bunkley, Terrence; Wright, Alex & Namuduri, Kamesh
Description: This paper discusses autonomous robot localization using WiFi fingerprinting. Abstract: We are using widely available 802.11 wireless networks to determine the location of autonomous robots. Before a robot can accomplish a simple task such as moving to a specific coordinate, it must accurately know its current location with-in a certain degree of accuracy. Humans often take their eye sight and spatial awareness for granted. For a robot, the computational difficulty of solving the same problem becomes apparent. Our implementation creates a database of wireless signal strengths of a given area and uses the current signal strength reading within the area to find a weighted signal space distance. The "closest" point in the database should also correlate with the current position of the robot. Given the robots correct location, the authors can successfully navigate around any area with sufficient Wi-Fi coverage.
Contributing Partner: UNT Honors College
Autonomous Robot Localization Using WiFi Fingerprinting

Autonomous Robot Localization Using WiFi Fingerprinting

Date: April 14, 2011
Creator: Wright, Alex; Bunkley, Terrence & Namaduri, Kamesh
Description: This presentation discusses research on using wireless networks to locate autonomous robots. The authors are using widely available 802.11 wireless networks to determine the location of autonomous robots.
Contributing Partner: UNT Honors College
Lunar Surface Navigation and Exploration

Lunar Surface Navigation and Exploration

Date: April 14, 2011
Creator: Mischo, Michael; Knott, Jeremy; Davis, LaTonya; Kendrick, Mario & Namuduri, Kamesh
Description: This paper discusses research on lunar surface navigation and exploration. Sending humans to other worlds is very costly and dangerous so first voyages are often made by machines. While machines are very cost effective they must be capable of performing many tasks in an environment where help may not be close or on the same planet at all. Our closest terrestrial body, the moon, is around 238,857 miles away and takes about eight seconds to send a message making remote control of these machines difficult and slow. The authors' approach is to have the system be completely autonomous and absent of human control. To accomplish complete automation, the first problem is to have the system navigate the terrain. This system is equipped with a stereoscopic camera and a visual frequency scanning laser to provide a robust sensor system for object detection and obstacle avoidance. In combination the stereoscopic cameras and the scanning laser can define the surrounding environment in very high detail, enabling the system to easily navigate through it. The implications of this technology could lead to less costly EVAs, lower risk to personnel, and ground level navigation and mapping of extra terrestrial terrain.
Contributing Partner: UNT Honors College
Applications of Logic Flowcharting With a Focus in Autonomous Robotic Operations

Applications of Logic Flowcharting With a Focus in Autonomous Robotic Operations

Date: 2012
Creator: Sink, Ashley Elizabeth; Gscheidle, Karl H.; Namuduri, Kamesh; Li, Li & Sterling, Phillip
Description: This poster discusses applications of logic flowcharting with a focus in autonomous robotic operations. The focus of this research project was to determine interactivity between flowcharting algorithms and programming of various robotic platforms.
Contributing Partner: UNT College of Engineering
Applications of Logic Flowcharting With a Focus in Autonomous Robotic Operations

Applications of Logic Flowcharting With a Focus in Autonomous Robotic Operations

Date: 2012
Creator: Sink, Ashley Elizabeth; Gscheidle, Karl H.; Namuduri, Kamesh; Li, Li & Sterling, Phillip
Description: This report discusses applications of logic flowcharting with a focus in autonomous robotic operations. Abstract: The focus of this research project was to determine interactivity between flowcharting algorithms and programming of various robotic platforms. We explored various flowcharting schemes and applications and implemented them on programming platforms for Acroname Garcia robots and LEGO Mindstorms NXT 2.0. The flowcharting and programming experiences have been used to develop a lesson plan on logic and the fundamentals of programming that will be used in high school Engineering Design and Problem Solving classes.
Contributing Partner: UNT College of Engineering
Applications of wireless sensors in monitoring Indoor Air Quality in the classroom environment

Applications of wireless sensors in monitoring Indoor Air Quality in the classroom environment

Date: 2012
Creator: Chamberlain, Blaine; Jordan, Georgette; Li, Xinrong; Thompson, Ruthanne; Borkar, Chirag & Mansour, Sahar
Description: This report discusses applications of wireless sensors in monitoring Indoor Air Quality in the classroom environment. Abstract: The focus of this research project was to investigate Indoor Air Quality monitoring technologies, government regulations and policies, and best practices to improve IAQ while minimizing the adverse effect of poor IAQ, specifically in the classroom environment. The investigation involved two parts: development of a cost effective indoor air quality prototype sensor unit and the deployment of the unit to monitor 5 different indoor locations. The data from the sample monitoring locations will then be compiled and analyzed. In addition, researching the literature was instrumental in establishing the parameters for testing the environment and conducting experiments. This provided valuable experiences which will be shared with both district teachers and students.
Contributing Partner: UNT College of Engineering
Applications of wireless sensors in monitoring Indoor Air Quality in the classroom environment

Applications of wireless sensors in monitoring Indoor Air Quality in the classroom environment

Date: 2012
Creator: Chamberlain, Blaine; Jordan, Georgette; Li, Xinrong; Thompson, Ruthanne; Borkar, Chirag & Mansour, Sahar
Description: This poster discusses applications of wireless sensors in monitoring indoor air quality in the classroom environment. The focus of this research project was to investigate Indoor Air Quality monitoring technologies, government regulations and policies, and best practices to improve IAQ.
Contributing Partner: UNT College of Engineering
Bringing real world applications for wireless sensor networks into the classroom: Telemetric monitoring of water quality in an artificial stream

Bringing real world applications for wireless sensor networks into the classroom: Telemetric monitoring of water quality in an artificial stream

Date: 2012
Creator: Bunn, Zac; Guerrero, Jose; Wolf, Lori; Fu, Shengli; Hoeinghaus, David; Driver, Luke et al
Description: This report discusses aquatic sensors and telemetric monitoring of water quality in an artificial stream. Abstract: This research report covers the use of a wireless sensor network (WSN) using the ZigBee protocol to remotely monitor an artificial aquatic ecosystem. Field tests were conducted at the University of North Texas Water Research Facility to compare the accuracy of a high-end standard YSI multi probe system to a cost efficient lab developed sensor cluster, which would be used in the classroom to bring more real-world experiences in engineering to students. Measurements were recorded every 10 seconds for pH, dissolved oxygen, and temperature for a period of 24 hours. Comparison results show a 10 percent degree of variability in dissolved oxygen possibly due to the sensitivity of the DO sensors themselves. On the other hand, temperature and pH measured less than a 5 percent error.
Contributing Partner: UNT College of Engineering
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