High Fidelity Tape Transfer Printing Based On Chemically Induced Adhesive Strength Modulation

Transfer printing, a two-step process (i.e. picking up and printing) for heterogeneous integration, has been widely exploited for the fabrication of functional electronics system. To ensure a reliable process, strong adhesion for picking up and weak or no adhesion for printing are required. However, it is challenging to meet the requirements of switchable stamp adhesion. Here we introduce a simple, high fidelity process, namely tape transfer printing(TTP), enabled by chemically induced dramatic modulation in tape adhesive strength. We describe the working mechanism of the adhesion modulation that governs this process and demonstrate the method by high fidelity tape transfer printing several types of materials and devices, including Si pellets arrays, photodetector arrays, and electromyography (EMG) sensors, from their preparation substrates to various alien substrates. High fidelity tape transfer printing of components onto curvilinear surfaces is also illustrated

A novel interface for first person shooter games on personal digital assistant devices

Includes abstract.Includes bibliographical references (leaves 71-73).The main aim of this study is to enhance the playability of games on current standard PDA devices. The newly designed interface more effectively leverages current well-established devices, which solves the problem of rapidly and accurately executing a large number of gaming commands. The outcomes of this research are beneficial for interface design of mobile applications

Space station power semiconductor package

A package of high-power switching semiconductors for the space station have been designed and fabricated. The package includes a high-voltage (600 volts) high current (50 amps) NPN Fast Switching Power Transistor and a high-voltage (1200 volts), high-current (50 amps) Fast Recovery Diode. The package features an isolated collector for the transistors and an isolated anode for the diode. Beryllia is used as the isolation material resulting in a thermal resistance for both devices of .2 degrees per watt. Additional features include a hermetical seal for long life -- greater than 10 years in a space environment. Also, the package design resulted in a low electrical energy loss with the reduction of eddy currents, stray inductances, circuit inductance, and capacitance. The required package design and device parameters have been achieved. Test results for the transistor and diode utilizing the space station package is given

Development and Assessment of User Interface for Security-Critical Systems

In this master's thesis a user interface for a security application was investigated. The thesis work was done at a security company in Sweden. The goal was to find current problems with the user interface and to develop a new prototype with improvements. A user-centered design approach was employed to achieve this. Another goal was to look at how this method works for security-critical systems and how usability affects security. By conducting a usability test, usability errors were found that affected information security. There were also other problems that arose when having to deal with trying to use a user-centered design approach when working for a security company

Communicating beyond the word - designing a wearable computing device for Generation Z

Humans have always communicated with each other. When the smartphone technology was launched on the market, it revolutionized the way people communicate. This smartphone technology is constantly evolving and during 2014 wearable computing seems to be in the focal point at most smartphone technology conferences. This master thesis aims to discover how a wearable computing device can further develop the communication between people with focus on communication beyond using words. Generation Z was chosen as a focus group. Their communication patterns, behavior and needs were the central parts for this thesis. A concept with a Low-Fidelity prototype was developed to visualize how a wearable computing device can be designed to take the communication beyond using only words. This concept and its design were developed using features of participatory design with help from possible end-users. Additionally, a usability evaluation on the final prototype was carried out. Three essential characteristics of the concept have been identified during the work process; beyond using words, predetermined message and spontaneous and easy. All three characteristics together make the concept well suitable for a wearable computing device since it takes the user’s interaction and communication behavior to a new level

Behavioural morphisms in virtual environments

One of the largest application domains for Virtual Reality lies in simulating the Real World. Contemporary applications of virtual environments include training devices for surgery, component assembly and maintenance, all of which require a high fidelity reproduction of psychomotor skills. One extremely important research question in this field is: "How closely does our facsimile of a real task in a virtual environment reproduce that Task?" At present the field of Virtual Reality is answering this question in subjective terms by the concept of presence and in objective terms by measures of task performance or training effectiveness ratios. [Continues.

Simulator verification techniques study. Integrated simulator self test system concepts

Software and hardware requirements for implementing hardware self tests are presented in support of the development of training and procedures development simulators for the space shuttle program. Self test techniques for simulation hardware and the validation of simulation performance are stipulated. The requirements of an integrated simulator self system are analyzed. Readiness tests, fault isolation tests, and incipient fault detection tests are covered

Development and Evaluation of a Real-Time Framework for a Portable Assistive Hearing Device

Testing and verification of digital hearing aid devices, and the embedded software and algorithms can prove to be a challenging task especially taking into account time-to-market considerations. This thesis describes a PC based, real-time, highly configurable framework for the evaluation of audio algorithms. Implementation of audio processing algorithms on such a platform can provide hearing aid designers and manufacturers the ability to test new and existing processing techniques and collect data about their performance in real-life situations, and without the need to develop a prototype device. The platform is based on the Eurotech Catalyst development kit and the Fedora Linux OS, and it utilizes the JACK audio engine to facilitate reliable real-time performance Additionally, we demonstrate the capabilities of this platform by implementing an audio processing chain targeted at improving speech intelligibility for people suffering from auditory neuropathy. Evaluation is performed for both noisy and noise-free environments. Subjective evaluation of the results, using normal hearing listeners and an auditory neuropathy simulator, demonstrates improvement in some conditions