Orientation map for planning and design methods

This paper constructs a contextual space for plotting the positions of P and D (Planning and design) methods, thus offering a framework for analysing, comparing and contrasting P and D approaches. Three dimensions make up this space: strategy, people involvement and attitude toward change. The strategy continuum varies between the extreme ends: pure inquiry and pure will. The people involvement dimension describes the passage of design control from designer to client. The scale for change attitude spans the distance between aversion to change and exploitation of change. Several well-known P and D methods and approaches are discussed and plotted, to test the validity of the suggested framework.     

Towards principled experimental study of autonomous mobile robots

We review the current state of research in autonomous mobile robots and conclude that there is an inadequate basis for predicting the reliability and behavior of robots operating in unengineered environments. We present a new approach to the study of autonomous mobile robot performance based on formal statistical analysis of independently reproducible experiments conducted on real robots. Simulators serve as models rather than experimental surrogates. We demonstrate three new results: 1) Two commonly used performance metrics (time and distance) are not as well correlated as is often tacitly assumed. 2) The probability distributions of these performance metrics are exponential rather than normal, and 3) a modular, object-oriented simulation accurately predicts the behavior of the real robot in a statistically significant manner.     

Knowledge-based programs

Summary.  Reasoning about activities in a distributed computer system at the level of the knowledge of individuals and groups allows us to abstract away from many concrete details of the system we are considering. In this paper, we make use of two notions introduced in our recent book to facilitate designing and reasoning about systems in terms of knowledge. The first notion is that of a knowledge-based program. A knowledge-based program is a syntactic object: a program with tests for knowledge. The second notion is that of a context, which captures the setting in which a program is to be executed. In a given context, a standard program (one without tests for knowledge) is represented by (i.e., corresponds in a precise sense to) a unique system. A knowledge-based program, on the other hand, may be represented by no system, one system, or many systems. In this paper, we provide a sufficient condition for a knowledge-based program to be represented in a unique way in a given context. This condition applies to many cases of interest, and covers many of the knowledge-based programs considered in the literature. We also completely characterize the complexity of determining whether a given knowledge-based program has a unique representation, or any representation at all, in a given finite-state context. Received: October 1995 / Accepted: February 1997     

A smart boring tool for process control

A mechatronic metal cutting tool has been developed to improve the accuracy and flexibility of line boring machining in the automotive industry. Laser position sensors and piezoelectric actuator were integrated into the rotating body of the boring tool. To compensate the boring bar droop and effects of cutting forces, a fast tool servo utilizing feedback control of the boring tool insert position was designed and embedded in the rotating tool assembly. In addition to position control, a self-monitoring algorithm that utilizes disturbance estimator has been put together in the controller. Experimental results demonstrated that the developed cutting process controller improves the accuracy of the boring tool as well as reliably detects the process failures, such as tool tip breakage, without additional monitoring equipment.     

A Mobile Platform for Nursing Robots

This paper describes a computer-controlled vehicle which is part of a nursing robot system currently under development at the Technion-Israel Institute for Technology. The platform of this vehicle can also be used for household robots. Design considerations, control algorithms, and the necessary sensory devices are discussed. The vehicle applies a motion control strategy which avoids slippage and minimizes position errors. Experimental results, performed on a prototype vehicle, are described as well.     

A data model for processes based on relative time

Advanced database applications such as automated manufacturing, scheduling, and computer-aided software engineering, demand an explicit representation of processes, including their decomposition into subprocesses, where subprocesses may be repeated or shared. Temporal information on these processes is inherently relative to particular temporal frames of reference, that may be different from that of a complex process containing them. We suggest the Rtime object-oriented data model in which processes are first-class citizens and complex processes are built, using standard type constructors, from their component processes. The relative timing of component processes is a key feature of the suggested model. It allows for a modular construction of complex process objects that may be repeated and shared. Standard object-oriented query languages can be used for temporal queries on processes, by providing an operator for translating timing information between different temporal frames of reference.     

Ash loss and the “seeded-tracer” technique for the determination of mass balance in rapid heating coal pyrolysis experiments

Pulverized-coal pyrolysis experiments have been conducted in an inert gas, Ar, under conditions of high heating rate (10⁵–10⁶ K/s), and high temperature (2000–2800 K). The dry-ash-free (daf) mass loss was calculated on the basis of a seeded-tracer, tungsten carbide powder, and on the basis of a natural tracer, titanium. The former method gave consistently higher daf mass loss. The data indicate that under these test conditions mineral elements in the coal, including some major and minor species, leave the parent coal and therefore cannot serve as a tracer for the determination of mass loss as is often done conventionally. The loss of some mineral elements is correlated with the daf mass loss. Criteria for the selection of a seeded tracer are discussed.     

Effect of self-differentiation and anonymity in group on deindividuation.

Investigated the effects of deindividuating conditions (i.e., anonymity) on the behaviors and feelings of self-differentiated and less self-differentiated individuals. 40 male 17–18 yr olds were divided on the basis of their scores on the portable rod-and-frame test into self-differentiated and undifferentiated groups. Each S was exposed to transgressive and prosocial behavior of 2 group members who were confederates. Exposure to the models' behavior occurred under conditions of anonymity or identifiability. Additionally, measures of Ss' feelings were taken. Data indicate that relative to identifiability conditions, the transgressions and prosocial actions of the models had stronger effects on the behaviors of undifferentiated Ss under anonymity conditions. Also, undifferentiated Ss felt less self-conscious and less inhibited under anonymity than identifiability conditions. The behaviors and feelings of self-differentiated Ss were relatively unaffected by the anonymity–identifiability manipulation. A conceptual link between self-differentiation, self-awareness, and deindividuation is proposed. (22 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Disulfide stabilization of antibody Fv: computer predictions and experimental evaluation

Using molecular modeling technology we have recently identifiedpositions in conserved framework regions of Fvs which can beused to stabilize antibody Fvs by an interchain disulfide bondengineered in between the structurally conserved framework positionsof the variable domains of heavy (V_H) and light (V_L) immunoglobulinchains (disulfide-stabilized Fv; dsFv). The computer model indicatedthe existence of other potential sites in the framework regionsthat might be suitable for disulfide bond formation betweenV_H and V_L. The possibility of obtaining dsFvs using these positionsis evaluated here experimentally by constructing dsFv immunotoxinsin which the Fv moiety is fused to a truncated form of Pseudomonasexotoxin. We analyzed the extent of dsFv formation and the activityof the resulting dsFv immunotoxins, and compared various dsFvmolecules with the scFv immunotoxin. Our results demonstratethat position H44-L105 is the only one which gives high productionyields of active dsFv. All other positions gave either low yieldsand activity or completely failed to produce active dsFv. Withone exception, the formation and activities of the dsFvs correspondedto the C-C distance between the VH and VL positions, with anoptimal distance of 5.7 Å producing the best dsFv. Distancesof 6.0–6.9 Å resulted in a' low yield of proteinthat was still capable of binding antigen, whereas distances>7.0 Å resulted in molecules in which dsFv formationwas not obtained.     

Online chronemics convey social information

Chronemic research explores the involvement of time-related messages in communication, and has shown that time is an important component of the message in both traditional and online communication. Social information processing (SIP) theory posits that online communicators exchange social information through chronemic cues. This study points to a gap in SIP theory research, and proceeds to close the gap by demonstrating that changes in socially important attributes are reflected in measurable chronemic changes. A two-person social dilemma online game is used to demonstrate that changes in a simple chronemic variable, interpost pause, reflect differences in the players’ personality (level of extraversion), as well as differences in trust within the dyad. These findings support SIP theory by showing how online chronemics provide cues to important personal and situational information.