Wenn das Potential der Flexibilität von SOA auf Basis der Änderbarkeit von Services erhalten und genutzt werden soll, ergeben sich besondere Herausforderungen beim Betrieb von SOA-basierten Lösungen. Dies wird am Beispiel des Service Level Management (SLM) und dem zur Überwachung und Auswertung erforderlichen Monitoring von Antwortzeiten demonstriert. Es wird gezeigt, dass dies eine Erweiterung...

The aberration introduced by the primary optical element of a lightweight large aperture telescope can be corrected with a diffractive optical element called the liquid crystal spatial light modulator. Such aberration is usually very large, which makes the design and modeling of such a system difficult. A method to analyze the system is introduced, and the performance limitation of the system i...

Multicarrier Code Division Multiple Access is the most promising technique for high speed data transmission. However, the MC-CDMA signals are characterized by large peak to average power ratios (PAPR), which can reduce the system efficiency. In this paper PAPR reduction of an MCCDMA system using SLM technique is investigated for different modulation schemes. The binary phase sequences considere...

The major drawback of orthogonal frequency-division multiplexing (OFDM) is its high peak-to-average power ratio (PAR), which gets even more substantial if a transmitter with multiple antennas is considered. To overcome this problem, in this paper, the partial transmit sequences (PTS) method—well known for PAR reduction in single antenna systems—is studied for multiantenna OFDM. A directed appro...

Measurements of partially spatially coherent infra-red laser beam intensity fluctuations propagating through a hot-air turbulence emulator are compared with visible laser beam intensity fluctuations in the maritime and IR laser beam intensity fluctuations in the terrestrial environment at the United States Naval Academy. The emulator used in the laboratory for the comparison is capable of gener...

The degree of similarity between L1 and L2 sounds is said to be crucial for L1/L2 sound distinction. Similar L1 and L2 sounds, according to the Speech Learning Model (SLM), tend to be undistinguished. Yet, much has been left undetermined of what counts as “similar”. In this study, the relation between phonetic similarity and L1/L2 sound distinction is explored by examining whether different aco...

In this work, we make a study on the effect of training set on statistical language modeling (SLM). A corpus selection system based on perplexity is presented. It is tested in two experiments: one is to select optimal training corpus for generating a domain-specific SLM; the other one is for generating an optimal SLM for a LVCSR system. The results show that the training corpus is important for...

In order to realize high-yield speckle modulation, we developed a novel spatial light modulator using zinc oxide single crystal doped with nitrogen ions. The distribution of dopants was optimized to induce characteristic optical functions by applying an annealing method developed by us. The device is driven by a current in the in-plane direction, which induces magnetic fields. These fields stro...

We present an implementation method for noiseless holographic projection of precalculated light fields with a spatial light modulator. In the reconstructed image, both the spatial amplitude and phase distributions can be programmed independently. This is achieved by diffracting the light from two successive phase holograms that are located in conjugate Fourier planes. The light path is folded s...