3,398 research outputs found
A history-based framework of servitization and deservitization
Purpose: The purpose of this study is to develop a history-based framework of servitization and deservitization. Design/methodology/approach: The study draws on three history-based management theories, i.e. industry lifecycle, strategic pivoting and strategy restoration, to develop a conceptual framework of how servitization and deservitization pivots influence firm performance in different stages of the industry lifecycle. A series of examples involving configurations and reconfigurations in production illustrate the theoretical propositions. Findings: The proposed framework predicts that servitization pivots positively influence firm performance in the ferment phase, but this effect gradually diminishes as industries advance into transition and mature phases. In contrast, the framework predicts that deservitization pivots negatively influence firm performance in the ferment phase; this effect, too, becomes negligible in the transition phase but positive in the mature phase. Moreover, the proposed framework predicts that deservitization pivoting outperforms servitization pivoting in mature servitized industries to the extent that such pivots are restorative in nature, thereby suggesting that deservitization may represent a strategic opportunity for firms in mature industries. Originality/value: This study highlights the role of history-based management theories in enhancing our understanding of servitization and deservitization.authorsversionpublishe
Design of a thrust stand for high power electric propulsion devices
A thrust stand for use with high power electric propulsion devices was designed and tested. The thrust stand was specifically tailored to the needs of a 100 to 250 kW magnetoplasmadynamic (MPD) thruster program currently in progress at the NASA Lewis Research Center. The thrust stand structure was built as an inverted pendulum arrangement, supported at the base by water-cooled electrical power flexures. Thrust stand tares due to thruster discharge current were demonstrated to be negligible. Tares due to an applied field magnet current, after considerable effort, were reduced to less than 3.0 percent of measured thrust. These tares, however, could be determined independently and subtracted from the indicated thrust measurement. A detailed description is given for the thrust stand design and operation with a 100 kW class MPD device. Other thrust stand tares due to vibration and thermal effects are discussed, along with issues of accuracy and repeatability
Study of sample drilling techniques for Mars sample return missions
To demonstrate the feasibility of acquiring various surface samples for a Mars sample return mission the following tasks were performed: (1) design of a Mars rover-mounted drill system capable of acquiring crystalline rock cores; prediction of performance, mass, and power requirements for various size systems, and the generation of engineering drawings; (2) performance of simulated permafrost coring tests using a residual Apollo lunar surface drill, (3) design of a rock breaker system which can be used to produce small samples of rock chips from rocks which are too large to return to Earth, but too small to be cored with the Rover-mounted drill; (4)design of sample containers for the selected regolith cores, rock cores, and small particulate or rock samples; and (5) design of sample handling and transfer techniques which will be required through all phase of sample acquisition, processing, and stowage on-board the Earth return vehicle. A preliminary design of a light-weight Rover-mounted sampling scoop was also developed
A hierarchically blocked Jacobi SVD algorithm for single and multiple graphics processing units
We present a hierarchically blocked one-sided Jacobi algorithm for the
singular value decomposition (SVD), targeting both single and multiple graphics
processing units (GPUs). The blocking structure reflects the levels of GPU's
memory hierarchy. The algorithm may outperform MAGMA's dgesvd, while retaining
high relative accuracy. To this end, we developed a family of parallel pivot
strategies on GPU's shared address space, but applicable also to inter-GPU
communication. Unlike common hybrid approaches, our algorithm in a single GPU
setting needs a CPU for the controlling purposes only, while utilizing GPU's
resources to the fullest extent permitted by the hardware. When required by the
problem size, the algorithm, in principle, scales to an arbitrary number of GPU
nodes. The scalability is demonstrated by more than twofold speedup for
sufficiently large matrices on a Tesla S2050 system with four GPUs vs. a single
Fermi card.Comment: Accepted for publication in SIAM Journal on Scientific Computin
Applicability of the Remote Mobile Emplacement Package (RMEP) design as a mobility aid for proposed post-84 Mars missions, phase O
The results of study to determine the applicability of the Remote Mobile Emplacement Package (RMEP) design concept as a mobility aid for the proposed post-'84 Mars missions are presented. The RMEP wheel and mobility subsystem parameters: wheel tire size, weight, stowed volume, and environmental effects; obstacle negotiation; reliability and wear; motor and drive train; and electrical power demand were reviewed. Results indicated that: (1) the basic RMEP wheel design would be satisfactory, with additional attention to heating, side loading, tread wear and ultraviolet radiation protection; (2) motor and drive train power requirements on Mars would be less than on Earth; and (3) the mobility electrical power requirements would be small enough to offer the option of operating the Mars mini rover untethered. Payload power required for certain sampling functions would preclude the use of battery power for these missions. Hazard avoidance and reverse direction maneuvers are discussed. Limited examination of vehicle payload integration and thermal design was made, pending establishment of a baseline vehicle/payload design
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