Flood has become a major hazard globally, and Bhutan with its steep terrain erratic rainfall caused significant economic damages in recent years. Given these challenges, there is lack of accurate flood prediction management strategies. This study, there-fore, evaluates three hydrological models—Integrate Analysis System (IFAS), Hy-drologic Engineering Centre Hydrologic Modeling (HEC-HMS), Group on Earth Observation Global Water Sustainability version 1 (GEOGloWS)—and identifies the most...

Flood has become a major hazard globally, and in Bhutan, with its steep terrain erratic rainfall, it caused significant economic damage recent years. Given these challenges, there is lack of accurate flood prediction management strategies. In this study, therefore, we evaluated three hydrological models—Integrated Analysis System (IFAS), Hydrologic Engineering Centre Modeling (HEC-HMS), Group on Earth Observation Global Water Sustainability (GEOGloWS)—and identified the most suitable model...

A single-mode output of 221 and 16 mW for the fundamental second-harmonic light was obtained with combination a Nd:YVO(4) microchip laser an intracavity KTP crystal. It found that beam size power in plano-plano cavity were dependent on absorption coefficient medium material had higher produced smaller cavity. This means is suitable not only oscillation but also efficient generation.

We have demonstrated high-power and high efficiency performance of a continuous-wave (CW) Nd:YAG laser with simple scalable side-pumping configuration. The maximum output power 147 W was obtained in low brightness operation M/sup 2/=45. corresponding electric is 14.8%. To our knowledge, this the highest value reported for diode side-pumped lasers. By using rate photon transport calculation, we estimated pumping 72%. High also carried out by applying bifocusing compensation rod. 272 MW/cm/sup...

This paper proposes fusion analysis of high-resolution multispectral and panchromatic satellite imageries for forest type classification. We have shown the performance classification using QuickBird separately. With texture features obtained from a imagery, was classified into two types, such as coniferous broad-leaved forests. On other hand, with spectral six three coniferous, one mixed These results showed that both are effective types. In this paper, we apply object-based common segments...

We have analyzed the stability of a high-power diode-side-pumped intracavity-frequency-doubled CW Nd:YAG laser. It is found that large green power fluctuations observed experimentally are suppressed by compensating thermal lensing nonlinear crystal KTP and rods with an advanced resonator design. Stable powers 27 W beam quality M/sup 2/=8 16 2/=1.2 (TEM/sub 00/-mode) were generated.

One of the most important problems in helicopter satellite communications is periodic blockage received signal caused by rotor blades. Code division multiplexing (CDM) has an implicit time diversity effect overcoming blockage. Performance CDM employing Walsh-Hadamard code (WHCDM) under environment investigated this paper. First, we show that a simple WHCDM scheme computer simulation. Next, combined with explicit proposed. The proposed improves bit error rate performance conventional high...

This letter reports the generation of 6.1 W red laser radiation by frequency-doubling a Nd:YAG operating at wavelength 1.319 /spl mu/m with KTP crystal. The conversion efficiency and stability output power were both improved through suppression means thin etalon two-wavelength operation in 1.3-/spl region.

In helicopter satellite communications, the periodic blockage of received signal and carrier frequency fluctuation are most important problems. this paper, we propose a novel pre-detection time diversity combining scheme with accurate automatic controller (AFC) for communications. proposed scheme, AFC tracks removes due to Doppler shift exactly, in-phase is performed before coherent detection. Results computer simulation show that improves BER performance previous post-detection scheme.

One of the most important problems in helicopter satellite communications is periodic blockage received signal due to rotor blades. Walsh-Hadamard (WH) code division multiplexing (WHCDM) promising order overcome because it has an implicit time diversity effect. However, inter-code interference (ICI) caused by loss orthogonality WH codes reduces Although combination WHCDM with explicit can mitigate ICI, its configuration rather complex and spectral efficiency degraded. In this paper, we...

Periodic blockage of the received signal due to rotor blades is one most important problems in helicopter satellite communications. Time diversity a promising method order overcome periodic blockage. In this paper, novel time combining scheme proposed. It performs maximal ratio on basis channel information estimated with pseudo bit error rate. The performance proposed evaluated by computer simulation. results show that remarkably improves rate conventional employing equal gain combining.

Selected mapping (SLM) is a well-known technique to reduce the peak-to-average power ratio (PAPR) in orthogonal frequency division multiplexing (OFDM). SLM generally requires side information for each OFDM symbol, which leads decrease transmitting efficiency. In addition, false detection degrades bit error rate (BER) performance significantly. this paper, we propose novel scheme without any by devising phase rotation and simple scrambler receiver. Computer simulation results show that...

Missing observational data pose an unavoidable problem in the hydrological field. Deep learning technology has recently been developing rapidly, and started to be applied Being one of network architectures used deep learning, Long Short-Term Memory (LSTM) largely related research, such as flood forecasting discharge prediction, performance LSTM model compared with other models. Although tuning hyperparameters, which influences model, is necessary, no sufficient knowledge obtained. In this...

In helicopter satellite communications, removal of time-varying Doppler shift due to maneuver is one the most important issues. The conventional automatic frequency control (AFC) scheme for communications removes exactly. However, its acquisition time extremely long. This caused by a delay element in feed-back loop. this paper, we propose novel AFC reduce time. proposed consists loop and feed-forward configuration excludes from Results computer simulation show that significantly reduces

A Q-switched diode-pumped Nd:YAG master oscillator and power amplifier system is developed in this study as a light source of frequency conversion. 300 W TEM <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">00</sub> mode linearly polarized 1064 nm beam generated at high repetition rate 10-30 kHz. The 266 average 27.9 the 213 10.2 obtained with quality CsLiB xmlns:xlink="http://www.w3.org/1999/xlink">6</sub> O...

In helicopter satellite communications, the periodic blockage of received signal and carrier frequency fluctuation are most important problems. this paper, we propose a novel automatic controller (AFC) scheme with time diversity combining. The proposed AFC generates error based on combined signal. signal-to-noise power ratio (SNR) is therefore prevented from falling to zero even in condition blockage. thus tracks removes due Doppler shift more exactly than conventional one. Results computer...

Selected mapping (SLM) is a well-known technique to reduce the peak-to-average power ratio (PAPR) in orthogonal frequency division multiplexing (OFDM). SLM generally requires side information for each OFDM symbol, which leads decrease transmitting efficiency. In addition, false detection degrades bit error rate performance significantly. this paper, we propose novel scheme without any by devising phase rotation and simple scrambler receiver. Computer simulation results show that proposed...

Abstract Poly‐Si TFTs were fabricated by both a YAG2ω laser and an excimer annealing system using same TFT manufacturing process, the electrical characteristics of compared. As result, it is found that wider process window can be obtained with system. The possibility overlapped irradiation also shown.

In this paper, we propose a novel automatic frequency control (AFC) scheme for code division multiplexing (CDM) system employing Walsh code. The proposed AFC discriminates the shift of received signal by detecting energy after Walsh-Hadamard transform (WHT). configuration is analogous with that delay locked loop (DLL) direct-sequence spread-spectrum (DS-SS) communications. initial acquisition performance evaluated computer simulation. It confirmed achieves fast when factor less than WHT order.

Lattice-reduction is an effective technique to improve the performance of MIMO data detection. This paper presents a quantization error reduction scheme for detection based on orthogonal lattices. The motivation proposed solve problem degrading due rounding in signal estimate stage. simulation results exhibit that can achieve near-ML with little additional complexity high Eb/N0 region. In addition, this efficient even modulation order.

This paper shows the object-based forest type classification using texture features from a panchro matic(PAN)image and spectral multispectral(MS)image obtained by QuickBird satellite.To investigate performance of each feature,first,only feature is applied to image analysis,then feature,and lastly combination features.In this analysis,we use common segments pansharpen in order compare difference only between features.Distance supervised classes used find well distinguishing combinations for...