Che-Cheng Chang

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In quantum mechanics, a wavefunction contains two factors: the amplitude and the phase. Only when the probing beam is fully phase coherent, can complete information be retrieved from a particle beam based experiment. Here we use the electron beam field emitted from a noble-metal covered W(111) single-atom tip to image single-walled carbon nanotubes (SWNTs)(More)
A new, simple, and easily reproducible method of preparing single-atom tips by electroplating Pd or Pt on single-crystal W(111) tips followed by thermal annealing in a vacuum is reported. These tips are both thermally and chemically stable and can also be regenerated when accidentally damaged. The atomic structures of the tips are identical to those(More)
The agreement problem is usually exploited to improve the fault-tolerant capability of software systems. For self-organized networks like cloud computing architectures that possess highly decentralized and self-organized natures, consensus, which is essential to solving the agreement problem, in such networks cannot be achieved in the ways for traditional(More)
Cuttlebone is a natural marine cellular material possessing the exceptional mechanical properties of high compressive strength, high porosity and high permeability. This combination of properties is exceedingly desirable in biomedical applications, such as bone tissue scaffolds. In light of recent studies, which converted raw cuttlebone into hydroxyapatite(More)
Placing replicas in a P2P network can reduced the number of hops required by a node to search an object. One existing replica placement strategy for structured P2P networks allocates replicas at nodes that are continuously close to the destination. In this paper, we investigate the effectiveness of such an approach. We propose an optimal algorithm to place(More)
For self-organized networks that possess highly decentralized and self-organized natures, neither the identity nor the number of processes is known to all participants at the beginning of the computation because no central authority exists to initialize each participant with some context information. Hence, consensus, which is essential to solving the(More)
The Distributed Trigger Counting (DTC) problem is o raise an alert while the number of riggers received by the whole system reaches a pre-defined amount. There have been several algorithms proposed to solve such a problem in the literature. However, these existing algorithms are all under the assumption that here is no even regarding process moving, leaving(More)