Timing-accurate storage emulation fills an important gap in the set of common performance evaluation techniques for proposed storage designs: it allows a researcher to experiment with not-yet-existing storage components in the context of real systems executing real applications. As its name suggests, a timing-accurate storage emulator appears to the system to be a real storage component with se...

This paper presents a hybrid energy storage system based on Compressed Air Energy Storage (CAES), where the extraction of energy is done within maximum efficiency conditions. As the maximum efficiency conditions impose the level of converted power, an intermittent time-modulated operation mode is applied to the thermodynamic converter to obtain a variable converted power. A smoothly variable ou...

This paper investigates the transient use of free local storage for improving performance in VM-based mobile computing systems. Many such systems boot from a portable storage device to create a “zero-install” environment on a computer that is borrowed for temporary use. Unfortunately, consumergrade portable storage devices are optimized for capacity and cost rather than performance, which has b...

Protecting confidential information is a major concern for organizations and individuals alike, who stand to suffer huge losses if private data falls into the wrong hands. One of the primary threats to confidentiality is malicious software on personal computers, which is estimated to already reside on 100 to 150 million machines. Current security controls, such as firewalls, anti-virus software...

Introduction: All-optical storage and signal processing are of intense interest for numerous applications, ranging from true-time delay for antenna remoting to all-optical convolution functions, all-optical signal regeneration, all-optical wavelength conversion, and all-optical buffers. The ability to control the optical group velocity over a wide range with high resolution is critical to enabl...

Timing-accurate storage emulation fills an important gap in the set of common performance evaluation techniques for proposed storage designs: it allows a researcher to experiment with not-yet-existing storage components in the context of real systems executing real applications. As its name suggests, a timing-accurate storage emulator appears to the system to be a real storage component with se...

Reducing access times to secondary I/O devices has long been the focus of many systems researchers. With traditional disk drives, access time is the composition of transfer time, seek time and rotational latency, so many techniques as to minimize these factors, such as ordering I/O requests or intelligently placing data, have been developed. MEMS-based storage devices are seen by many as a repl...

My research project examined the effects on read performance from the addition of a long term read buffer to YAFFS2. YAFFS (Yet Another Flash Filing System) is a file system, the program that organizes data on a storage device (like a hard drive), that is specialized for flash memory. Flash memory is a type of storage device that is typically found in embedded devices, like cell phones or PDA's...

The fundamental limits of performance for a general model of information retrieval from databases are studied. In the scenarios considered a large quantity of information is to be stored on some physical storage device. Requests for information are modeled as a randomly generated sequence with a known distribution. The requests are assumed to be “context-dependent”, i.e., to vary according to t...

We present DevFS, a direct-access file system embedded completely within a storage device. DevFS provides direct, concurrent access without compromising file system integrity, crash consistency, and security. A novel reverse-caching mechanism enables the usage of host memory for inactive objects, thus reducing memory load upon the device. Evaluation of an emulated DevFS prototype shows more tha...