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Event-aware Hierarchical Routing with Differential Compression to Extend WSN Lifetime
You-Chiun Wang,Bo-Chun Pan 한국통신학회 2020 한국통신학회 APNOMS Vol.2020 No.09
Wireless sensor networks are popularly used in IoT applications. It is essential to save energy of sensors on reporting data. Though many routing methods have been developed, how to well integrate packet routing with data compression is not much discussed. Hence, we propose an event-aware hierarchical routing with differential compression (EHR-DC) scheme. It groups sensors and selects a cluster head (CH) in each group to manage routing and compression. In normal times, sensors transmit data to their CHs, which are condensed by exploiting spatial correlation. When events appear, sensors adaptively forward data to nearby CHs to raise the efficiency of compression. Through simulations, we show that EHR-DC outperforms other methods in terms of network lifetime and the amount of sensing data retrieved by the sink.
An Introduction to China High-Tech Research Project on Beyond 3G Mobile Communications FuTURE
You, Xiao-Hu,Pan, Zhi-Wen,Jameel, Ahmed J. The Korean Institute of Communications and Informa 2002 정보와 통신 Vol.19 No.7
This paper introduces the Future Technologies for Universal Radio Environment (FUTURE), which is China's wireless communications research project oriented to beyond 3G systems. The features and basic requirements of the FUTURE project are described, and the system structure, which is based on IPv6 core network, is proposed. The key techniques for FUTURE project are also addressed.
Daily Variation of Phytoplankton and Water Quality in the Lower Nakdong River
Lee, You-Jung,Jung, Jong-Mun,Shin, Pan-Se,Joo, Gea-Jae The Korean Society of Phycology 2005 ALGAE Vol.20 No.2
Daily variation of phytoplankton community and environmental parameters were investigated at the lower Nakdong River (Mulgum) from January 2002 to December 2003 to investigate the dynamics of a phytoplankton community in detail. The daily results of water quality in this investigation showed pH (8.1 $\pm$ 0.7), DO (10.3 $\pm$ 2.7 $mg{\cdot}l^{-1}$), water temp. (18.8 $\pm$ 7.4°C), BOD (2.4 $\pm$ 1.0 $mg{\cdot}l^{-1}$), COD (5.3 $\pm$ 1.2 $mg{\cdot}l^{-1}$) and chl. a (43.5 $\pm$ 35.1 mg ${\cdot}m^{-3}$). The results of nutrient factors were the following: TN (3.1 $\pm$ 0.8 $mg{\cdot}l^{-1}$), NO3-N (2.5 $\pm$ 0.5 $mg{\cdot}l^{-1}$), TP (90 $\pm$ 48 ${\mu}g\;{\cdot}\;l^{-1}$), PO4-P (43 $\pm$ 30 ${\mu}g\;{\cdot}\;l^{-1}$). Dominant phytoplankton species during the study period were diatom (Stephanodiscus hantzschii, Aulacoseira granulata var. angustissima and A. italica) and cyanobacteria (Microcystis aeruginosa, Aphanizomenon flos-aquae). The small centric diatom, Stephanodiscus hantzschii, was repeatedly dominant from late fall to the following spring (mean and maximum cell density, 2.3 × 103 $\pm$ 3.8 × 103, 4.5 × 105 cells $ml^{-1}$, respectively). Pinnate diatom, Aulacoseira granulata var. angustissima and A. italica, were frequently observed all season except January to March. Cyanobacteria, Microcystis aeruginosa and Aphanizomenon flos-aquae, proliferated in summer of 2002 except in 2003 due to heavy precipitation. The dominant zooplankton species (March-early May) was rotifer (Brachionus, Keratella, Polyarthra) and cladocerans (Diaphanosoma). The daily observed dynamics of the phytoplankton community in the lower Nakdong River in this study may play an important role in increasing the detailed resolution of limnological information and serving as ecological data for future studies.
Visual deprivation modifies oscillatory activity in visual and auditory centers
Ping Pan,You Zhou,Fanghao Fang,Guannan Zhang,Yonghua Ji 한국통합생물학회 2018 Animal cells and systems Vol.22 No.3
Loss of vision may enhance the capabilities of auditory perception, but the mechanisms mediating these changes remain elusive. Here, visual deprivation in rats resulted in altered oscillatory activities, which appeared to be the result of a common mechanism underlying neuronal assembly formation in visual and auditory centers. The power of high-frequency β and γ oscillations in V1 (the primary visual cortex) and β oscillations in the LGN (lateral geniculate nucleus) was increased after one week of visual deprivation. Meanwhile, the power of β oscillations in A1 (the primary auditory cortex) and the power of β and γ oscillations in the MGB (medial geniculate body) were also enhanced in the absence of visual input. Furthermore, nerve tracing revealed a bidirectional nerve fiber connection between V1 and A1 cortices, which might be involved in transmitting auditory information to the visual cortex, contributing to enhanced auditory perception after visual deprivation. These results may facilitate the better understanding of multisensory cross-modal plasticity.
Image Captioning with Synergy-Gated Attention and Recurrent Fusion LSTM
Yang, You,Chen, Lizhi,Pan, Longyue,Hu, Juntao Korean Society for Internet Information 2022 KSII Transactions on Internet and Information Syst Vol.16 No.10
Long Short-Term Memory (LSTM) combined with attention mechanism is extensively used to generate semantic sentences of images in image captioning models. However, features of salient regions and spatial information are not utilized sufficiently in most related works. Meanwhile, the LSTM also suffers from the problem of underutilized information in a single time step. In the paper, two innovative approaches are proposed to solve these problems. First, the Synergy-Gated Attention (SGA) method is proposed, which can process the spatial features and the salient region features of given images simultaneously. SGA establishes a gated mechanism through the global features to guide the interaction of information between these two features. Then, the Recurrent Fusion LSTM (RF-LSTM) mechanism is proposed, which can predict the next hidden vectors in one time step and improve linguistic coherence by fusing future information. Experimental results on the benchmark dataset of MSCOCO show that compared with the state-of-the-art methods, the proposed method can improve the performance of image captioning model, and achieve competitive performance on multiple evaluation indicators.