The initial design of Apache Hadoop  was tightly focused on running massive, MapReduce jobs to process a web crawl. For increasingly diverse companies, Hadoop has become the <i>data and computational agorá</i>---the de facto place where data and computational resources are shared and accessed. This broad adoption and ubiquitous usage has stretched… (More)
We consider repeated games with side-payments: players have an endowment of wealth in each period in which transfers can be made. We show that if endowments are large enough and the common discount factor high enough, then a strongly renegotiation–proof equilibrium (SRP) in the sense of Farrell and Maskin exists. As the discount factor goes to 1, the set of… (More)
A radial core from a Norway spruce (Picea abies (L.) Karst.) estimated to be about 107 years old was cut from a board and was analyzed for density and microfibril angle (MFA). Furthermore, cell geometry, wall thickness and lignin distribution were analyzed on three selected growth rings in detail. Intra-ring differences in the density profiles are also true… (More)
This paper discusses the controller design of a PZT-actuated suspension dual-stage servo system in hard disk drives. The proposed control structure includes an active vibration damping control loop and a track-following control loop. The vibration damping control loop, which runs at a faster rate than the track-following control loop, utilizes a PZT element… (More)
—Structural resonance modes of the head stack and suspension assembly are one of the major limiting factors for achieving higher head-positioning servo performance in hard disk drives. This paper discusses the vibration suppression control of a PZT actuated suspension dual-stage servo system. A PZT strip on a PZT actuated suspension is utilized as a… (More)
In this paper we describe a new approach to the problem of path planning with moving obstacles. Our approach is based on the maneuvering board method commonly used for nautical navigation. We have extended this method to handle cases where obstacles may maneuver at any time and where knowledge of the position and velocity of the obstacles may be uncertain.
Natural human interfaces are a key to realizing the dream of ubiquitous computing. This implies that embedded systems must be capable of sophisticated perception tasks. This paper analyzes the nature of a visual feature recognition workload. Visual feature recognition is a key component of a number of important applications, e.g. gesture based interfaces,… (More)
This paper examines the role of veteran status as a screen during the Vietnam era. While overall earnings differentials between Vietnam-era veterans and nonveter-ans are small, they vary systematically with schooling, age, and race. Little evidence is found supporting the hypothesis that veteran status is generally a positive screen. During the Vietnam era,… (More)