Engineering

Latest Innovations

Method for Growing a Polarization Free GaN-Based Laser Diode

Prof. Bayram from the University of IL has developed a method of depositing (growing) GaN on silicon substrates with complete surface coverage of cubic phase GaN. 
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Prof. Bayram from the University of IL has developed a method of depositing (growing) GaN on silicon substrates with complete surface coverage of cubic phase GaN. 

This technology provides a new method of integrating GaN photonics with silicon electronics. 

Applications are in light emitting diodes and transistors. 

Publication: Richard Liu and Can Bayram, "Aspect Ratio Optimization of cubic phase GaN on patterned silicon substrate using phase transition", Appl.Phys. Lett. To be submitted.

Method for Constructing Flow Constrictions Inside Microfluidic Channels (TF01064)

A necessary function for microfluidic devices used in biology is the ability to "hold" a cell or other object (e.g., embryo) in a known physical location while maintaining...

A necessary function for microfluidic devices used in biology is the ability to "hold" a cell or other object (e.g., embryo) in a known physical location while maintaining the flow around it. This is particularly useful in bioproduction and applications such as incubation/maturation, infection, fertilization, or chemical treatment of a biological object. Although lithographic etching can be used to construct the holding areas (i.e., constriction regions), this method is expensive and complex. This technology uses a simple and inexpensive method -- polymerization -- to construct flow constriction regions. A prepolymer mixture if flowed into the microfluidic channel and polymerized using an ultraviolet source. As it is polymerized, the polymer shrinks, creating a small gap at the top of the channel. This gap allows the fluid flow to continue while the cell/object is held in place. Thus, this technology enables microfluidic devices to be constructed more cost-efficiently.

MacEtch Method Using CMOS Compatible catalyst TiN

 

 

Dr. Xiuling Li from the University of IL has developed a new MacEtch method using TiN as the metal catalyst. Compared with conventional MacEtch catalysts,...

 

 

Dr. Xiuling Li from the University of IL has developed a new MacEtch method using TiN as the metal catalyst. Compared with conventional MacEtch catalysts, mostly noble metal such as Pt Au Ag, TiN has been used as insulator/adhesive layer in current CMOS production, thereby is a compatible catalyst. This method enables the combination of MacEtch with CMOS production to fabricate micro-nano structure with high-aspect ratios.

Photonic Resonator Outcoupler Microscopy (PROM)

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Dr. Brian Cunningham has identified a novel label-free microscopy modality that quantitatively measures the scatter-induced changes in reflected intensity from a photonic crystal biosensor surface to reveal the kinetic evolution and spatial features of focal adhesions that form at the cell-surface interface. Compared to a sensing approach in which image contrast is generated by the dielectric permittivity of attached cell components, PROM provides contrast in reflected resonant intensity that is induced by the refractive index contrast of localized protein clusters that occur at the cell-surface interface that comprise FA sites. We expect PROM to be a highly useful tool that can reveal the mechanisms of biological processes that occur near the cell membrane when it is attached to extracellular matrix materials during apoptosis, stem cell differentiation, migration, division, and metastasis.

Benefits
  • Non-photobleaching
  • Imaging live cells for extended periods of time
  • Creates realtime movies of Focal Adhesion development

Power Balanced Pipelines

 

 

Power balancing techniques are provided for improving power efficiency of pipelined processors. A design-level implementation can be incorporated during...

 

 

Power balancing techniques are provided for improving power efficiency of pipelined processors. A design-level implementation can be incorporated during synthesis of pipeline clocks in which a register transfer level (RTL) code, operating frequency, and available voltage domains are used to perform cycle time stealing with, and optimize for, power efficiency. A test-level implementation can be incorporated during testing of a chip in which delay and power measurements are used to perform calculations based on cycle time stealing and optimization of power efficiency. The calculations are then used to perform voltage scaling and/or adjust tunable delay buffers. Process variations may also be corrected during test time. A run-time approach can be incorporated for dynamic power balancing in which the operating system keeps track of one or more performance indicators such as a count of floating point instructions and uses a look-up table to provide the appropriate delays.

Tie Strength Prediction and WeMeddle

 

 

A computer-implemented method of predicting tie strength between persons within a social media network includes: modeling tie strengths between a user of...

 

 

A computer-implemented method of predicting tie strength between persons within a social media network includes: modeling tie strengths between a user of the social media network and connected persons in the network as a combination of: a plurality of predictive variables, interactions between dimensions of the predictive variables, and network structure of the social media network; altering or filtering a stream of social media content from the connected persons using the tie strength as associated with the respective connected persons according to the modeling; and delivering the altered or filtered stream of social media content to a communications device of the user.

Live Computer Capture and Triage Tool (CCTT)

 

 

A system for executing a cyber investigation by a non-expert user, including a computer having a processor, a memory, and a display; a computer-readable...

 

 

A system for executing a cyber investigation by a non-expert user, including a computer having a processor, a memory, and a display; a computer-readable medium having stored thereon instructions for execution of a wizard application, the processor adapted to execute the instructions when the computer-readable medium is inserted into the computer, the processor programmed to: receive case information; receive a type of activity being investigated in response to user inputs to select the activity type from a list of possible activity types; guide the user through capturing data related to the selected activity type through steps presented to the user through one or more screens shown in the display, the steps presented such that a non-expert user can follow them; receive user inputs through a screens to obtain information needed to continue capturing the data related to the selected activity; and store the captured data in a removable data storage device or medium for analysis and use in the cyber investigation.

Method and System for Distributed, Localized Authentiaction in the Framework of 802.11i

 

 

A method for controlling Internet access of a mobile device by using a communication system having a number of access points includes the steps of...

 

 

A method for controlling Internet access of a mobile device by using a communication system having a number of access points includes the steps of performing a certificate-based authentication between an authentication access point and a mobile device seeking access to the Internet; transmitting a certificate from the mobile device to the authentication access point; verifying the certificate by the authentication access point; determining whether the authenticating mobile device's certificate has been revoked prior to the expiration of its lifetime; and granting the authenticating mobile device access to the Internet, if the certificate has been verified successfully and not revoked prior to the expiration of its lifetime.

Method for Exchanging Messages and Verifying the Authenticity of the Messages in an Ad Hoc Network

 

 

A method for exchanging messages containing reliable information between nodes in an ad hoc network, such as a vehicle ad hoc network. The method includes...

 

 

A method for exchanging messages containing reliable information between nodes in an ad hoc network, such as a vehicle ad hoc network. The method includes the steps of providing a public key for a PKI encrypted certificate authority signature to all nodes known to transmit reliable information. Each node transmits a signal containing node identification information and the PKI encrypted certificate authority signature associated with that node. Each node also receives like signals from other nodes and then decrypts the certificate authority signatures from the received signals by using the certificate authority public key to ascertain the authenticity of the received certificate authority signatures and the reliability of the received message. Thereafter, the nodes receive and accept messages with a TESLA encrypted signature only with nodes identified to have authentic certificate authority signatures until the occurrence of a subsequent predefined event, such as a new node in the network or the elapse of a predetermined time period.

A Method for Transaction Dependency Graph Construction Using Signal Injection

 

 

A method for measuring system response sensitivity, using live traffic and an analysis that converts randomly arriving stimuli and reactions to the stimuli...

 

 

A method for measuring system response sensitivity, using live traffic and an analysis that converts randomly arriving stimuli and reactions to the stimuli to mean measures over chosen intervals, thereby creating periodically occurring samples that are processed. The system is perturbed in a chosen location of the system in a manner that is periodic with frequency p, and the system's response to arriving stimuli is measured at frequency p. The perturbation, illustratively, is with a square wave pattern.

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