The Mac OS X kernel (xnu) is a hybrid BSD and Mach kernel. While Unix-oriented rootkit techniques are pretty well known, Mach-based rootkit techniques have not been as thoroughly publicly explored. This paper covers a variety of rootkit techniques for both user-space and kernel-space rootkits using unique and poorly understood or documented Mac OS X and Mach features.

Experimental studies of the formation and structure of Mach cones in a plasma crystal are presented. Plasma crystals are ordered structures of charged microspheres trapped in the sheath of an rf discharge plasma. Using a monolayer crystal with a hexagonal lattice, Mach cones were excited by the radiation pressure of a focused laser beam. The beam was swept at a supersonic speed through the crys...

In the Present paper effect of angle of incidence on pitching derivatives of a delta wing with Straight leading edges for attached shock case in Supersonic Flow has been studied. A Strip theory is used in which strips at different span wise location are independent. This combines with similitude to give a piston theory. From the results it is seen that with the increase in the Mach number, ther...

We present recent progress of high-speed Mach-Zehnder modulator technologies for advanced modulation formats. Multi-level quadrature amplitude modulation signal can be synthesized by using parallel Mach-Zehnder modulators. We can generate complicated multi-level optical signals from binary data streams, where binary modulated signals are vectorially summed in optical circuits. Frequency respons...

The Mach 3 operating system makes extensive use of remote procedure calls (RPCs) to provide services to client applications. Although the existing Mach 3 RPC facility is highly optimized, the incorporation of a Lightweight Remote Procedure Call (LRPC) facility further reduces this critical cost. This paper describes the implementation of LRPC in the Mach 3 operating system, reviewing the origin...

The Lattice Boltzmann Method (LBM) has numerous computational advantages, such as the simplicity of programming, the ability to incorporate microscopic interactions, and the easy parallelization of algorithms. The traditional lattice Boltzmann model has a constraint of small mach number(the velocity of fluid must be less than 0.3 mach). This paper presents a novel lattice Boltzmann method to si...

Although Ernst Mach is widely recognized in psychology for his discovery of the effects of lateral inhibition in the retina ("Mach Bands"), his contributions to the theory of depth perception are not as well known. Mach proposed that steady luminance gradients triggered sensations of depth. He also expanded on Ewald Hering's hypothesis of "monocular depth sensations," arguing that they were sub...

Patterns of optic nerve activity were computed for stationary step patterns of illumination from theoretical models of lateral inhibiton based on revised Hartlin-Ratliff equations. The computed response patterns contain well-defined Mach bands which match closely in amplitude and shape those recorded from single optic nerve fibers of the Limulus lateral eye. Theory and experiment show that the ...

1. Abstract We have implemented a default memory manager for the Mach 3.0 kernel that resides entirely in user space. The default memory manager uses a small set of kernel privileges to lock itself into memory, preventing deadlocks against other Mach system services. An extension to the Mach boot sequence loads both the kernel and user program images at system startup time. The resulting system...

A modification of the Roe scheme aimed at low Mach number flows is discussed. It improves the dissipation of kinetic energy at the highest resolved wave numbers in a low Mach number test case of decaying isotropic turbulence. This is done by scaling the jumps in all discrete velocity components within the numerical flux function. An asymptotic analysis is used to show the correct pressure scali...