No description available.

Thesis (Ph. D.)--University of Texas at Austin, 2008. / Vita. Includes bibliographical references.

The purpose of this work was to explore the error correction performance of the CDROM data storage medium in both a standard and hostile environment. A detailed simulation of the channel has been written in Pascal. Using this the performance of the CD-ROM correction strategies against errors may be analysed. Modulated data was corrupted with both burst and random errors. At each stage of the decoding process the remaining errors are both illustrated and discussed. Results are given for a number of varying burst lengths each at different points within the data structure. It is shown that the maximum correctable burst error is approximately 7000 modulated data bytes. The effect of both transient and permanent errors on the performance of a CD-ROM was also investigated. Here software was written which allows both block access times and retries to be obtained from a PC connected to a Hitachi drive unit via a SCSI bus. A number of sequential logical data blocks are read from test discs and access times and retry counts are recorded for each. Results are presented for two classes of disc, one which is clean and one with a surface blemish. Both are exposed to both standard and hostile vibration environments. Three classes of vibration are considered: isolated shock, fixed state sinusoidal and swept sinusoidal. The critical band of frequencies are demonstrated for each level of vibration. The effect of surface errors on the resistance to vibration is investigated.

This thesis is dedicated to developing three different types of ferrocene-containing polymers for organic lithium-ion battery and resistive memory applications. Chapter 1 gives an overview of organic cathode-active materials, polymeric resistive memories and ferrocene-containing polymers. Furthermore, the previously reported applications of ferrocene-containing polymeric systems in electrochemical energy storage and electronical memory devices were also comprehensively summarized. In chapter 2, conjugated ferrocene-containing side-chain metallopolymers PFcFE1, PFcFE2, PFcFE3 and PFcFE4 were designed and synthesized via Sonogashira cross-coupling polycondensation. The charging-discharging processes of triphenyamine-based PFcFE1 and thiophene-modified PFcFE4 have been successfully studied as cathode materials. PFcFE1 composite electrode showed a capacity of 90 mAh g-1 and the cathode composed of PFcFE4 retained over 90% of the initial capacity after 100 charging-discharging cycles at 10 C. These results demonstrate the great potentials of these ferrocene-containing side-chain polymers as active cathode materials for organic lithium-ion battery applicaitons. Besides, all prepared ferrocene-containing metallopolymers PFcFE1, PFcFE2, PFcFE3 and PFcFE4 also exhibited nonvolatile resistive switching behaviors with the flash memory effect of PFcFE1, PFcFE2 and PFcFE3 as well as the WORM memory feature of PFcFE4, indicating the easily tuned memory properties by changing the chemical structures of the active polymeric backbones. It is also worth noting that the ITO/PFcFE1/Al memory device showed a high ON/OFF current ratio of 103 to 104, a low switch-on voltage of -1.0 V, a long retention time of 1000 s and a large read cycle number up to 105, which is superior to other reported ferrocene-containing memory examples. Chapter 3 focuses on the development of non-conjugated ferrocene-containing copolymers PVFVM1, PVFVM1-1, PVFVM2, PVFVM3, PVFVM4, PVFVM5 and PVFVM6 based on different heteroaromatic moieties which were prepared by AIBN initiated chain addition polymerization. The as-prepared copolymers PVFVM1 and PVFVM1-1 exhibited electrochemical characteristics of both ferrocene and triphenylamine pendants with reversible multiple redox waves at the half potentials of E1/2 = --0.06, 0.30, and 0.42 V (vs. Fc/Fc+). Notably, the composite electrode based on PVFVM1 afforded a discharge capacity of 102 mAh g--1 at 10 C, corresponding to 98% of its theoretical capacity. The cycle endurances of the active polymer electrodes composed of PVFVM1 or PVFVM1-1 were both evaluated for over 50 numbers and no significant capacity reduction over cycles were observed. On the other hand, initial I-V results of memory devices based on PVFVM1, PVFVM1-1, PVFVM2, PVFVM3, PVFVM4 and PVFVM6 also revealed their huge potentials in electronic information storage. The stability and reproducibility of the corresponding memory devices based on these materials will be futher evaluated in the near future. We used 1,1'-ferrocenediboronic acid bis(pinacol) ester to develop conjugated ferrocene-containing main-chain metallopolymers in chapter 4. All these rational designed metallopolymers FcMMP1, FcMMP2, FcMMP3 and FcMMP4 with one or two ferrocene moieties were produced via Suzuki cross-coupling polycondensation. Their structural information, molecular masses, photophysical features and thermal properties have been well studied. Electrochemical performances of the formed polymers were also examined to clarify their potential as cathode-active materials. Other charge-storage characteristics and switching behaviors of these prepared ferrocene-containing main-chain metallopolymers for organic battery and memory applications are under further investigation.

Thesis. 1977. B.S.--Massachusetts Institute of Technology. Dept. of Interdisciplinary Science. / MICROFICHE COPY AVAILABLE IN ARCHIVES AND SCIENCE. / Includes bibliographical references. / by Mark P. Abbate. / B.S.

No description available.

No description available.

This thesis describes a design for a multi-computer communication system using a shared memory. The design is implemented using the Motorola EXORset 30/DS35 development systems. The primary use for the shared memory is to act as a message center similar to a mailbox, where each computer can leave messages for other computers and also pick up messages from other computers. Status word residing in shared memory, called semaphore, are used to indicate the condition of the mailbox. Each computer polls unique semaphores associated with unique message transfers when requesting to send a message or to receive a message.

Chen, Junyu. / Thesis M.Phil. Chinese University of Hong Kong 2014. / Includes bibliographical references (leaves 56-61). / Abstracts also in Chinese. / Title from PDF title page (viewed on 25, October, 2016).

Thesis (M.S.)--Rochester Institute of Technology, 2008. / Typescript. Includes bibliographical references (leaves 73-75).