Building the Infrastructure: The Effects of Role Identification Behaviors on Team Cognition Development and Performance

The primary purpose of this study was to extend theory and research regarding the emergence of mental models and transactive memory in teams. Utilizing Kozlowski et al.’s (1999) model of team compilation, we examine the effect of role identification behaviors and argue that such behaviors represent the initial building blocks of team cognition during the role compilation phase of team development. We then hypothesized that team mental models and transactive memory would convey the effects of these behaviors onto team performance in the team compilation phase of development. Results from 60 teams working on a command and control simulation supported our hypotheses

Waveguiding in planar photonic crystals

Photonic crystal planar circuits designed and fabricated in silicon on silicon dioxide are demonstrated. Our structures are based on two-dimensional confinement by photonic crystals in the plane of propagation, and total internal reflection to achieve confinement in the third dimension. These circuits are shown to guide light at 1550 nm around sharp corners where the radius of curvature is similar to the wavelength of light

Compositional modulation and ordering in semiconductors

Journal ArticleThe science of materials as a specific discipline is a relatively modern development. Within this rather modern field, the study of semiconductor materials is an even more recent development. Modern textbooks on materials science focus primarily on the properties of metals and second on the properties of ceramics, reflecting the commercial importance of these materials 50 years ago when the transistor was demonstrated using germanium

Planar photonic crystal

We present results of guiding light in a single-line-defect planar photonic crystal (PPC) waveguide with 90° and 60° bends. The wave guiding is obtained by total internal reflection perpendicular to the plane of propagation and by the photonic band gap for the 2D photonic crystal in the plane. The results for photonic waveguiding are shown and demonstrated at 1.5 µm wavelength

Experimental and theoretical confirmation of Bloch-mode light propagation in planar photonic crystal waveguides

The dispersion diagram of the leaky modes in the planar photonic crystal waveguide is experimentally obtained for the wavelengths from 1440 to 1590 nm. A small stop band, around wavelength 1500 nm, is detected. The experimentally obtained results are in very good agreement with our three-dimensional finite difference time domain calculations. Propagation losses of the leaky modes are estimated and we have found that they decrease as we approach the ministop band

Ultra narrow AuPd and Al wires

In this letter we discuss a novel and versatile template technique aimed to the fabrication of sub-10 nm wide wires. Using this technique, we have successfully measured AuPd wires, 12 nm wide and as long as 20 $\mu$m. Even materials that form a strong superficial oxide, and thus not suited to be used in combination with other techniques, can be successfully employed. In particular we have measured Al wires, with lateral width smaller or comparable to 10 nm, and length exceeding 10 $\mu$m.Comment: 4 pages, 4 figures. Pubblished in APL 86, 172501 (2005). Added erratum and revised Fig.

Cladding strategies for building-integrated photovoltaics

Photovoltaic cladding on the surfaces of commercial buildings has the potential for considerable reductions in carbon emissions due to embedded renewable power generation displacing conventional power utilization. In this paper, a model is described for the optimization of photovoltaic cladding densities on commercial building surfaces. The model uses a modified form of the ‘fill factor’ method for photovoltaic power supply coupled to new regression-based procedures for power demand estimation. An optimization is included based on a defined ‘mean index of satisfaction’ for matched power supply and demand (i.e., zero power exportation to the grid). The mean index of satisfaction directly translates to the reduction in carbon emission that might be expected over conventional power use. On clear days throughout the year, reductions of conventional power use of at least 60% can be achieved with an optimum cladding pattern targeted to lighting and small power load demands

Slippage in the System: The Effects of Errors in Transactive Memory Behavior on Team Performance

[Excerpt] Although researchers have consistently shown that the implicit coordination provided by transactive memory positively affects team performance, the benefits of transactive memory systems depend heavily on team members’ ability to accurately identify the expertise of their teammates and communicate expertise-specific information with one another. This introduces the opportunity for errors to enter the system, as the expertise of individual team members may be misunderstood or misrepresented, leading to the reliance on information from the wrong source or the loss of information through incorrect assignment. As Hollingshead notes, “information may be transferred or explicitly delegated to the ‘wrong’ individual in the system, e.g., one who does not have responsibility for that type of information or is unlikely to remember it due to a lack of expertise”. While researchers recognize the likelihood of such behavioral errors, little research has examined their potential impact in teams. The current study, therefore, focuses on the effects of errors in transactive memory behavior on the emergence of team cognitive structures and resultant performance in the initial stage of team interaction. To develop our hypotheses, we first discuss the types of behaviors involved in the development and operation of transactive memory systems, identify where errors may arise, and discuss their effects on team performance. Then, we attempt to uncover the cognitive processes underlying those effects. More specifically, we introduce mental model accuracy and transactive memory cognitions and suggest that each mediates the negative relationship between errors in transactive memory behavior and team performance. While the possible risks of faulty transactive memory system development have been acknowledged in prior research, it has also been suggested that transactive memory errors can be easily corrected and their effects on performance subsequently minimized. The current study challenges this assumption and in doing so advances our understanding of not only the relationship between errors in transactive memory behavior and team performance but also the mechanisms that might help explain this relationship

Waveguiding at 1550 nm using photonic crystal structures in silicon on insulator wafers

Design, fabrication and light guiding in planar photonic crystal structures including sharp corners with a bending radius less than 1 micron are demonstrated at 1550 nm wavelength in silicon waveguides on silicon dioxide substrates. Photon confinement in the sample plane was achieved by a photonic crystal structure while confinement in the vertical direction was achieved by index of refraction contrast