Fan Yu

China Institute of Water Resources and Hydropower Research

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Zhiming Li

University of Electronic Science and Technology of China

Mao Wei

China University of Mining and Technology

Chengming Zhang

China Tobacco

Yongnan Zhu

Capital Medical University

Hu Xiaochun

Yunnan Observatories

Mingming Yang

Northwest A&F University

Wenwen Gong

Beijing Academy of Agricultural and Forestry Sciences

Qianjin Xiong

China Geological Survey

Peng Qinyu

Yunnan Observatories

Deyuan Chang

Huawei Technologies (Canada)

Cooperative Institutions

Chinese Academy of Sciences

Tsinghua University

Huawei Technologies (China)

China Institute of Water Resources and Hydropower Research

Yunnan Observatories

University of Chinese Academy of Sciences

Chinese Academy of Surveying and Mapping

Zhejiang University

Southeast University

Harbin Medical University

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The Impact of Institutional Investors on the Structure of CEO's Equity-Based Compensation

SSRN Electronic Journal (2012)

Fan Yu

This paper investigates the impact of variation in firms’ monitoring environment on the equity-based compensation structures. Starting in 2005, firms were required to expense employee option grants, eliminating the possibility of potential inflated accounting earnings by the different accounting treatment for expensing restricted stock and options. The variation in the equity pay structures after regulation change allows us to investigate other determinants of the equity pay structure than the perceived constraint by the accounting treatment. I find that the variation in the equity pay structure is at least partly due to the variation in the monitoring environment. Consistent with standard contract theory, a better monitored firm has more information on managers and can rely less on aggressive incentive pay. I use long-term independent institutional investors with concentrated equity holdings (LT Top5) to capture a firm’s monitoring environment. I find that firms with larger LT Top5 ownership tend to replace options with restricted stock in CEO compensation package. Such replacement decreases the general ex-ante dollar-to-dollar wealth-for-performance sensitivity and the total pay level. After controlling for the equity pay structure, I do not find any direct impact of LT Top5 on the general sensitivity. It suggests that the impact of LT Top5 on the wealth-for-performance sensitivity is via the design of CEOs’ compensation package. The findings provide an explanation for the variation in equity pay structures and its impact on the CEO pay level and wealth-for-performance sensitivity. The paper provides additional evidence on the monitoring role of concentrated independent institutional investors.

Equity

Executive compensation

10.2139/ssrn.2022955

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An interpolation method for soil moisture considering the spatio-temporal characteristic

Hao Xia Fan Yu Chengming Zhang Chao Zhang Wenwen Gong

Soil moisture is a kind of important surface environmental variable, it's important for Scientific research and production practice to obtain high quality regional soil moisture data. The paper established a new interpolation method used the time series observation data which obtained by ground sensor network as as data source, based on the theory of signal superposition, and combined spatial analysis and optimal interpolation theory. Firstly, the observed value is divided into the trend part and the residual value by the way of wavelet decomposition. Then interpolate the two part Separately through High accuracy surface modeling(HASM) and improved residual function modeling. Finally, get the final result by adding the two parts according to the signal superposition principle. The experiment used the soil moisture observation data set obtained by ground sensor network at Heihe area for the month of 2012 5–9. We compared the final data with the result which use ordinary Kriging or HASM alone. The method in this paper has no smoothing effect compared with Kriging, and it has higher accuracy when compared with HASM. The new method showed the advantage of soil moisture interpolation.

Interpolation

Smoothing

10.1109/agro-geoinformatics.2016.7577695

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Books in transit

The Bodleian Library Record (1934)

Fan Yu

10.3828/blr.1934.7.83.472a

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FEC for High Speed Optical Transmission

Changsong Xie Yu Zhao Zhiyu Xiao Deyuan Chang Fan Yu

This paper will at first explain the requirement of high speed optical transport network on forward error correction (FEC) codes in terms of code length, code rate, coding gain, burst error correction capability, error floor, latency, coding/decoding complexity. Then, a few code schemes used in current optical transport systems such as Reed-Solomon codes recommended by ITU-T G.709 and enhanced FECs listed in ITU-T, G.975.1 are introduced. Advanced codes recently developed by vendors used for 100Gbps systems and their performances are summarized. Features and special requirements on soft decoding FEC (SDFEC) especially inter-working between SDFEC and equalizer, with and without deferential coding etc. are analyzed. Some perspectives of future FEC for optical transport are also given.

Forward error correction

Coding gain

Reed–Solomon error correction

10.1364/acp.2011.83091r

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Research on Inter-Symbol Interference Suppression Technology and Fusion Algorithm of Optical Communication System

2022 3rd International Conference on Smart Electronics and Communication (ICOSEC) (2022)

Fan Yu

This article mainly studies the use of fusion algorithms to solve the problem of inter-symbol interference suppression technology in optical communication systems. First, this article introduces the application background and research trends of visible light communication. A new type of two-dimensional optical address code is proposed. Since the two parameters of the number of wavelengths and the code length of the new two-dimensional optical address code are independent of each other, the code set can be increased without changing the number of wavelengths independently, thereby increasing the optical code division multiple access. The system accommodates the number of concurrent users. The simulation results show that when the number of PDs of the hemispherical angle diversity receiving antenna is 4, the optimal spacing and tilt angle between adjacent PDs are 0.1m and 50, respectively. Compared with the plane receiving structure of four PDs based on traditional technology, the average signal-to-noise ratio of the proposed scheme has increased by 15.2%.

Code (set theory)

10.1109/icosec54921.2022.9952079

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Analysis of OSNR Margin Improvement in Beyond 100Gb/s PDM-DQPSK Systems Due to FEC

Asia Communications and Photonics Conference and Exhibition (2009)

Deyuan Chang Fan Yu Yuanda Huang Bangning Mao Yuanyuan Fang

The OSNR margin improvements due to FEC limit elevation in 112Gb/s PDM-DQPSK systems under two different receiver schemes, direct detection and coherent detection with digital signal processing (DSP), are analyzed. FEC limit elevation provides more benefit to the direct detection scheme than to the coherent detection scheme in 112Gb/s PDM-RZ-DQPSK system.

Margin (machine learning)

Forward error correction

10.1364/acp.2009.wl61

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Design of the highway visibility examination system based on GSM

Manufacturing Automation (2012)

Fan Yu

Visibility

GSM

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100Gb/s超PDM-DQPSKシステムにおけるFECによるOSNRマージン改善の解析

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (2009)

Chang Deyuan Fan Yu Huang Yuanda Mao Bang-Ning Fang Yuanyuan

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RESEARCH ON ESTIMATION CROP PLANTING AREA BY INTEGRATING THE OPTICAL AND MICROWAVE REMOTE SENSING DATA

The international archives of the photogrammetry, remote sensing and spatial information sciences/International archives of the photogrammetry, remote sensing and spatial information sciences (2013)

Yuanyuan Jia Fan Yu

Abstract. Considering the problem in monitoring agricultural condition in the semi-arid areas of Northwest of China, we propose a new method for estimation of crop planting area, using the single phase optical and microwave remote sensing data collaboratively, which have demonstrated their respective advantages in the extraction of surface features. In the model, the ASAR backscatter coefficient is normalized by the incident angle at first, then the classifier based on Bayesian network is developed, and the VV, VH polarization of ASAR and all the 7 TM bands are taken as the input of the classifier to get the class labels of each pixel of the images. Moreover the crop planting areas can be extracted by the classification results. At last, the model is validated for the necessities of normalization by the incident angle and integration of TM and ASAR respectively. It results that the estimation accuracy of crop planting area of corn and other crops garden are 98.47% and 78.25% respectively using the proposed method, with an improvement of estimation accuracy of about 3.28% and 4.18% relative to single TM classification. These illustrate that synthesis of optical and microwave remote sensing data is efficient and potential in estimation crop planting area.

Normalization

10.5194/isprsarchives-xl-7-w1-55-2013

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Comparison of Various Models for Optimal Water Distribution in Canal Systems

Applied Sciences (2025)

Xufeng Zhang Fan Yu Zhanyi Gao Mingming Yang Yifan Wang

Optimized water distribution models for canals are used to ensure that crop water demands are met through the efficient allocation of flow rates and times. A well-designed water distribution model can shorten irrigation durations, reduce canal water delivery losses, and improve irrigation water utilization efficiency. In this study, five optimal water distribution models were selected for comparison: Irrigation Model 1 (upstream-to-downstream irrigation), Irrigation Model 2 (downstream-to-upstream irrigation), Irrigation Model 3 (continuous irrigation between groups, with rotational irrigation within groups), Irrigation Model 4 (rotational irrigation between groups, with continuous irrigation within groups), and Irrigation Model 5 (rotational irrigation-based optimal distribution). These models were applied to the Fengqigou branch canal in the Bojili Irrigation District. The advantages and disadvantages of each model were analyzed from five perspectives: total water distribution duration; utilization of canal infrastructure; leakage losses in canal delivery; volume of abandoned water; and operability for irrigation managers. The results indicated that Irrigation Models 1 and 2 are easy to manage, and result in minimal leakage losses for upper-level canals. Irrigation Models 3 and 4 exhibit shorter total irrigation durations and lower water abandonment rates. However, Irrigation Model 5 requires optimization of idle times to enhance its applicability.

10.3390/app15042233

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