Ya Guo

Ya Guo
University of Missouri | Mizzou · Department of Biological Engineering

About

93
Publications
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1,214
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Publications

Publications (93)
Preprint
Full-text available
Wind effects on vegetation growth have not been examined at the global scale. In this work, the spatial and temporal effects of wind speed on global Solar-induced Chlorophyll Fluorescence (SIF) and Gross Primary Production (GPP) were analyzed. The results show: (1) Spatially, wind has almost the same area percentage (about 12%) of positive influenc...
Article
Full-text available
While modern agriculture brings more food to people, it causes environmental pollution as well. Agricultural pollution has attracted extensive public attention. A lot of reviews on agricultural research were conducted from different research aspects, but there is a lack of work on analyzing the research trend from large volumes of publications in t...
Article
Introduction of antibiotics into agricultural fields poses serious health risks to humans. This study investigated the uptake of antibiotics, their effects on metabolic pathways, and chloroplast structure changes of Allium tuberosum exposed to norfloxacin (NFL), oxytetracycline (OTC), and tetracycline (TC). Among all the antibiotic treatments, the...
Article
Spatial temperature distribution of a greenhouse is critical to precision agriculture management, especially for the vertical cultivation mode. Crop transpiration and optical effects influence spatial temperature distribution of a greenhouse, which, however, were often omitted in literature. In this work, a Computational Fluid Dynamics model on stu...
Article
Frogs play an important role in ecological systems, while frog species across the globe are threatened and declining. Therefore, it is valuable to estimate the frog population based on an intelligent computer system. Due to the success of deep learning (DL) in various pattern recognition tasks, previous studies have used DL-based methods for frog c...
Article
The effectiveness of satellite solar-induced chlorophyll fluorescence (SIF) for drought evaluation was measured in this study. Here we compare the association of SIF with soil moisture (SM), precipitation (PPT), standardized precipitation evapotranspiration index (SPEI), and ratio of evapotranspiration (ET) to monitor the drought stress on crop gro...
Article
Amylase (E.C.3.2.1.1) is one of the most important enzymes, of great significance for biotechnology. With the increasing number of studies of amylases, it is urgent to comprehensively gasp the future research trend of amylase, which promotes research and applications of amylase. Besides, the understand the past, present and future of amylase resear...
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Drought is the primary and dominant natural cause of stress on vegetation, and thus, it needs our full attention. Current understanding of drought across extensive spatial measures, around the world, is considerably limited. As case studies to evaluate the feasibility of utilizing space-based solar-induced chlorophyll fluorescence (SIF) across exte...
Article
Driving behavior classification has received increasing attention in recent years, where driving maneuver classification plays an important role. The first step of building a driving maneuver classification system is to segment maneuvers, which is often realized by using a single sliding window in previous work. However, different types of driving...
Article
Frog population has been experiencing rapid decreases worldwide, which is regarded as one of the most critical threats to global biodiversity. Therefore, large volumes of frog recordings have been collected for assessing this decline. Most previous studies focused on the syllable segmentation based frog call classification, which is sensitive to th...
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Full-text available
Traditional co-word networks do not discriminate keywords of researcher interest from general keywords. Co-word networks are therefore often too general to provide knowledge if interest to domain experts. Inspired by the recent work that uses an automatic method to identify the questions of interest to researchers like “problems” and “solutions”, w...
Article
Antibiotics frequently contaminate agricultural fields and through plant uptake enter into the food chain. This study aimed to explore the effects of antibiotics; tetracycline (TC), oxytetracycline (OTC) and norfloxacin (NF) on the growth, cell ultrastructure, and metabolite pattern of Brassica rapa ssp.chinensis. Oxytetracycline accumulated more t...
Article
In aquaculture, dissolved oxygen (DO) is vital to crab growth. Different from DO in flowing water area, the dynamics of DO in a crab pond is deeply affected by complex interactions between organism communities and meteorological factors. Significant fluctuations of DO content occurs within 24 h. It is thus important to explore DO dynamics related t...
Article
Prediction of dissolved oxygen (DO) concentration pattern is important for aquatic system management and environmental monitoring. The large amounts of experimental data needed often limit the ability to develop a reliable DO prediction model for a given aquatic system. In this research, deep learning and transfer learning techniques were applied t...
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Full-text available
In this work, the main activities of the plant photosynthesis process are discussed to yield a minimized mathematical model structure with photosystem II (PSII) chlorophyll a fluorescence (ChlF) as a measurable output. After experimental validation of the model structure, we demonstrate that the states of the photosynthetic process may be observed...
Article
Background With limited agricultural land and increasing human population, it is essential to enhance overall photosynthesis and thus productivity. Oxygenic photosynthesis begins with light absorption, followed by exci-tation energy transfer to the reaction centres, primary photochemistry, electron and proton transport, NADPH and ATP synthesis, and...
Article
Cadmium (Cd) is an inauspicious abiotic traction that not only influences crop productivity and its growth parameters, but also has adverse effects on human health if these crops are consumed. Among crops, leafy vegetables which are the good source of mineral and vitamins accumulate more Cd than other vegetables. It is thus important to study photo...
Article
BackgroundESRD (End-stage renal disease) treatment is a comprehensive medical process and requires numerous serological biochemical tests (SBTs) in diagnosis. To reduce these invasive, expensive, cumbersome, and time-consuming SBTs, there is a need to develop an alternative serological biochemical composition evaluation method. Bioelectrical impeda...
Article
Fruit image segmentation is an essential step to distinguish fruits from the background. In order to improve the fruits recognition accuracy for harvesting robots in three-dimensional (3D) space, a method with the fusion of color and 3D geometry features for fruit point cloud segmentation was proposed in this study. The local descriptor was applied...
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Full-text available
Cloud computing has been employed for supporting storage and handling of Internet of Things (IoT) data. There is an increasing demand for IoT framework to provide services with fast processing time and less delay to offer latency sensitivity real-time applications like disaster management in smart homes. IoT process is mostly comprised of schedulin...
Article
A two-dimensional symmetric heat transfer model and a fluid rotation model were established to study beer pasteurization process through the COMSOL Multiphysics software. Two heating modes, including closed-loop heating (CLH) and open-loop heating (OLH), were considered. There was a significant natural convection phenomenon in both heating systems....
Article
The process optimization and biological characterization of marshmallow root polysaccharides (MRPs) obtained from the microwave-assisted extraction (MAE) were studied. The highest MAE-yield (14.47%) was optimized at 457.32 W and 75 °C for 26 min. The extracted crude polysaccharides were purified using ion-exchange and gel-filtration chromatographie...
Article
This paper investigated a usage of multispectral imaging system based on single shot method for detecting the foreign matter (FM) in the pickled and dried mustard (PDM) on a moving conveyor belt. Multispectral images of PDM and FM in a quiescent state and the PDM mixed with FM in a moving state were respectively obtained using the multispectral ima...
Article
Frog population has been experiencing rapid decreases worldwide, which is regarded as one of the most critical threats to the global biodiversity. Therefore, large volumes of frog recordings have been collected for assessing this decline. Building an automatic frog species classification system is becoming ever more important. The traditional syste...
Article
Full-text available
Optical absorption and scattering properties are often estimated from the diffusive reflection light intensity at only one distance from the material surface, which often encounters accuracy and convergence issues. In this work, a method was proposed to determine optical properties by using diffusive reflection light intensity profiles at multiple...
Article
Full-text available
Dissolved oxygen (DO), an important water quality indicator in aquaculture, affects the survival rate of aquatic creatures and the yield of aquatic production. Therefore, it is important to predict DO in fishery ponds for applying artificial aeration with low energy and cost. Recently, deep learning models, such as recurrent neural network (RNN), l...
Article
Full-text available
Over the past two decades, bioacoustics and ecoacoustics have attracted a great deal of scholarly attention for their importance in investigating biology and ecology. Consequently, large volumes of academic articles have been published, which make it difficult to clearly understand current research trends. However, global research trends are import...
Article
Full-text available
Chlorophyll a fluorescence has been extensively used in studying photosynthesis and overall physiology of plants, algae, and cyanobacteria. As a research hotspot, a large number of papers have been published. This creates a challenge for beginning researchers to gain a holistic view of co-author and co-cited reference network by reading individual...
Article
Automatic identification and detection of fruit on trees by machine vision is the basis of developing automatic harvesting robots in agriculture. The occlusion of branches, leaves and other fruits in canopy images will affect the accuracy of fruit detection. To provide a scientific and reliable technical guidance for fruit harvesting robots, a meth...
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Full-text available
The emission of chlorophyll fluorescence (ChlF) from photosystem II (PSII) of plant leaves the couple with photoelectron transduction cascades in photosynthetic reactions and can be used to probe photosynthetic efficiency and plant physiology. Because of population increase, food shortages, and global warming, it is becoming more and more urgent to...
Article
Full-text available
Detection and classification of potato defects are of great significance to ensure food safety and improve product quality. This study investigated the potential of a novel multispectral imaging system based on single shot method for detection and classification of potato defects. A total of 417 potato samples were used in the experiment. The 25 sp...
Article
In recent years, fruit harvesting robots have become a research hotspot for agricultural machinery. To be effective, robots should quickly and accurately detect fruits on trees in the complex environments. In this study, a method using an RGB-D (Red, green, blue, and depth space) camera combining colour data and 3D contour features for the detectio...
Article
In vitro oral bioaccessibility of Cadmium (Cd) in two low (XGSJ), (SHQI) and two high (CGBC), (SIYM) Cd-accumulating affinity cultivars of Brassica rapa ssp. chinensis L. (pak choi) grown on Cd-contaminated Alfisol soil was assessed. In this study, physiologically based extraction test (PBET) and in vitro gastrointestinal (IVG) were chosen to asses...
Article
Background: With limited agricultural land and increasing human population, it is essential to enhance overall photosynthesis, and thus, productivity. Oxygenic photosynthesis begins with light absorption, followed by excitation energy transfer to the reaction centers, primary photochemistry, electron and proton transport, ATP synthesis, and then C...
Article
Full-text available
Global interests in organic foods are of importance to researchers and the food industry. Traditional questionnaire-based methods do not provide a broad picture. To meet this need, worldwide interests in organic foods were studied by integrating query data from the Google search engine and deep learning methods. The results show that organic oil, o...
Article
Seed purity is an important parameter for evaluating seed quality and can be effectively studied by seed classification. Hyperspectral images between 400 and 1000 nm were acquired for 1632 maize seeds (17 varieties) for classifying seed varieties. Fourteen features including a spectral feature and 13 imaging features (i.e., 5 first-order and 8 s-or...
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Full-text available
Maximal and partial quantum yields of photosystem II (Fv/Fm and Fv–/Fp) in Phaseolus vulgaris leaves were determined in response to the turning on saturating and low (undersaturating) actinic light, accordingly. Measuring lights (ML) of blue, green, and red colors were applied simultaneously using a novel method of the polychromatic fast Fourier tr...
Article
Four extraction methods of hot-water (HWE), ultrasound-assisted (UAE), microwave-assisted (MAE), and ultrasound-microwave assisted (UMAE) were utilized to determine the best technique to extract pectin from the common fig (Ficus carica L.) skin. UMAE (11.71%) significantly showed a more extraction yield than MAE (9.26%), UAE (8.74%), and HWE (6.05%...
Article
Objectives: This study aims to test the mediating effect of attitude toward aging and the moderating effect of social support in the association between perceived health status and depression in older adults. Methods: The study hypotheses were tested by using quantitative data collected from 6485 Chinese older adults. SPSS macro PROCESS was employ...
Article
Following a step excitation, chlorophyll fluorescence (ChlF) from photosystem II (PSII) of a dark‐adapted photosynthetic organism exhibits the well‐known OJIP pattern. The OJIP induction has been widely used in plant science and agriculture engineering. While the J and I phases are related to transitions of photochemical reaction redox states, char...
Article
Full-text available
CO2 concentration ([CO2]) in a greenhouse may be a limiting factor for plant growth. Current greenhouse CO2 control strategy usually depends on expert experience, which may control [CO2] in a moderate range but cannot make it optimal due to lack of considering plant photochemistry reactions. A state-space kinetic model structure covering major phot...
Article
Four operating parameters in ultrasound-microwave assisted extraction (UMAE) process including sonication time (ST, 10-30 min), microwave power (MP, 300-600 W), irradiation time (IT, 5-15 min), and the liquid to solid ratio (LSR, 10-30 mL/g) on the extraction yield of pectin from fig skin were optimized. The yield (13.97%) of pectin with an average...
Article
Full-text available
Food safety (FS), as a topic important to human health and wellbeing, has attracted a great deal of attention. With the large volume of publications in the area, it is hard to gain a comprehensive picture of the research trends. A scientometric data-driven analysis of the field can help reveal the diverse facets of FS. Food safety is critical in tw...
Article
Full-text available
Background The activation of phototransduction cascade in rod photoreceptors has been well studied in literature, but there is a lack of a mature kinetic model structure covering both the activation and inactivation processes. Methods In this work, a kinetic model structure is developed to describe the major activation and inactivation processes i...
Article
Dissolved oxygen (DO) plays a vital role in fish production, but DO sensors are expensive and often malfunction as a result of corrosion and deposition of debris. In this work, polynomial regression, back-propagation neural network (BPNN), and long short-term memory (LSTM) were applied to develop models for estimation of DO from non-DO measurements...
Article
Full-text available
The space pose of fruits is necessary for accurate detachment in automatic harvesting. This study presents a novel pose estimation method for sweet pepper detachment. In this method, the normal to the local plane at each point in the sweet-pepper point cloud was first calculated. The point cloud was separated by a number of candidate planes, and th...
Article
Full-text available
Emission of chlorophyll fluorescence (ChlF) from photosystem II (PSII) is affected by both plant status and environmental conditions. In this work, a state space model structure for ChlF from PSII with temperature as a variable model parameter was developed to provide insights into the temperature effects on photosynthesis and greenhouse temperatur...
Preprint
Following a step excitation, chlorophyll fluorescence (ChlF) from photosystem II of a dark-adapted plant leaf exhibits the well-known OJIP pattern. The OJIP induction has been widely applied in plant science, agriculture engineering, and environmental engineering. While the J and I phases are related to transitions of photochemical reaction redox s...
Article
Full-text available
Increased knowledge about the online search behavior of restaurant consumers is valuable to restaurant management and marketing professionals. However, people in different countries may demonstrate distinctive online search behaviors. There has been a lack of cross-cultural research on the online search behavior of restaurant consumers. In this wor...
Article
Full-text available
Green houses play a vital role in modern agriculture. Artificial light illumination is very important in a green house. While light is necessary for plant growth, excessive light in a green house may not bring more profit and even damages plants. Developing a plant-physiology-based light control strategy in a green house is important, which implies...
Article
The accurate identification of tea varieties is of great significance to ensure the interests of tea producers and consumers. As a non-destructive or micro damage detection method, laser-induced breakdown spectroscopy (LIBS) has been widely used in the quality detection or classification of agricultural products and food. The objective of this rese...
Article
In recent years, Deep Learning (DL), such as the algorithms of Convolutional Neural Networks (CNN), Recurrent Neural Networks (RNN) and Generative Adversarial Networks (GAN), has been widely studied and applied in various fields including agriculture. Researchers in the fields of agriculture often use software frameworks without sufficiently examin...
Article
Laser-induced breakdown spectroscopy (LIBS) is an analytical technique that has gained increasing attention because of many applications. The production of continuous background in LIBS is inevitable because of factors associated with laser energy, gate width, time delay, and experimental environment. The continuous background significantly influen...
Article
The use of hyperspectral imaging technology combined with chemometrics is an effective nondestructive method for sorting seed varieties. However, the performance of the method is susceptible to the influence of time and depends on the training set used in the modeling process. The accuracy of classification models maybe deteriorate when they are us...
Article
An automated method for maize and weed detection is very important to efficiently remove weeds and precisely calculate the quantity of maize. Color features were used in this study to investigate a simple maize-detection method using a color machine-vision system. Conventional image segmentation methods based on RGB values cannot separate maize fro...
Article
The laser induced breakdown spectroscopy (LIBS) technique is an effective method to detect material composition by obtaining the plasma emission spectrum. The overlapping peaks in the spectrum are a fundamental problem in the qualitative and quantitative analysis of LIBS. Based on a curve fitting method, this paper studies an error compensation met...
Article
Total volatile basic nitrogen (TVB-N) content is an important index used to evaluate the freshness of pork. In this paper, a strategy for measurement of TVB-N content in pork through hyperspectral imaging (HSI) (400-1000 nm) was developed. Firstly, image textural features based on Gabor filter and spectral features were obtained from the hyperspect...
Article
Full-text available
Vegetable freshness is very important for both restaurant and home consumers. In market, sellers frequently apply water to leafy vegetables to make them not lose weight and look fresh; however, these vegetables may not be stored for a long time as they appear. After a time limit, they may be quickly rotten. It is thus meaningful to investigate earl...
Article
Full-text available
Purpose This paper aims to analyze and model consumer behavior on hotel online search interest in the USA. Design/methodology/approach Discrete Fourier transform was used to analyze the periodicity of hotel search behavior in the USA by using Google Trends data. Based on the obtained frequency components, a model structure was proposed to describe...