Chiachung Chen

National Chung Hsing University | NCHU · Department of Bio-industrial Mechatronics Engineering

Plant micropropagation has been commercialized for producing high-quality and virus-free plantlets. High cost and intense labors are the main problems with this technique. The concept of system engineering was adopted to describe the schedule of Phalaenopsis micropropagation and to formulate these related parameters. Factors affecting costs were th...

Measurement uncertainty is an important parameter to express measurement results including means and reliability. The uncertainty analysis of the biomedical measurement system needs to be established. A perspiration measurement system composed of several sensors was developed. We aim to estimate the measurement uncertainty of this system with sever...

Phalaenopsis, an important pot plants worldwide, are propagated with a tissue culture technique. The aim of the present study was to validate growth models for Phalaenopsis plantlets with measured data. Effect of temperature and light irradiance on the growth characteristics was investigated by total weight, total leaf area and weight ratio of shoo...

Plant temperature can provide important physiological information for crop management. Non-contact measurement with an infrared thermometer is useful for detecting leaf temperatures. In this study, a novel technique was developed to measure leaf emissivity using an infrared thermometer with an infrared sensor and a thermocouple wire. The measured v...

The sorption isotherm is important information for evaluating the ability of an adsorption system to treat the industrial waste water. In this study, eleven datasets from literatures were selected and three two-parameter and three-parameter equations were used to evaluate adsorption systems. Quantitative criteria included six error functions, and t...

Five species of beans were chosen to observe the effects of intermittent periods and doses of cell phone electromagnetic field radiation (EMR) on germination seeds. Beans were grown under the same environment and the EMR was different. The treatment included two intermittent periods (4 and 24 h) and three radiation intensities (high, low, and check...

The frequency domain reflectometry (FDR) meter is a convenient sensor used to measure the water content of soils and substrates. An adequate calibration equation evaluated by statistical techniques is important to ensure the performance of the FDR meter. In this study, the calibration equation was used to express the relationship between the volume...

This study aims to explore the effects of heat and cold stress on the radial pressure pulse (RPP) and heart rate variability (HRV). The subjects immersed their left hand into 45°C and 7°C water for 2 minutes. Sixty healthy subjects (age 25 ± 4 yr; 29 men and 31 women) were enrolled in this study. All subjects underwent the supine temperature measur...

Diagnosis by radial arterial pulse is very important in Traditional Chinese Medicine (TCM). The objective of this study is to evaluate the effects of detection time and position on the parameters of time- and frequency-domain of radial pulse wave and to differentiate between Dyspepsia and Rhinitis by the statistical analysis of two signal types. A...

The effect of adequateness of the calibration equations on measurement uncertainty was not mentioned by EURACHEM. In this work, we investigate the sources of uncertainty when measuring glucose concentration with a UV–Vis spectrophotometer. The effect of two calibration equations on the uncertainty was compared. The sources of the glucose concentrat...

The measurement of the leaf temperature of forests or agricultural plants is an important technique for the monitoring of the physiological state of crops. The infrared thermometer is a convenient device due to its fast response and nondestructive measurement technique. Nowadays, a novel infrared thermocouple, developed with the same measurement pr...

Infrared tympanic thermometers (ITTs) are easy to use and have a quick response time. They are widely used for temperature measurement of the human body. The accuracy and uncertainty of measurement is the importance performance indicator for these meters. The performance of two infrared tympanic thermometers, Braun THT-3020 and OMRON MC-510, were e...

The sorption isotherms of Oolong tea were determined at temperatures ranging from 5 to 50°C. Estimated parameters and fitting ability for nine equilibrium relative humidity (ERH) models were evaluated. The modified Oswin equations were found to be an adequate model of three parameters to describe the sorption data. The Andrieu model was the only ad...

The effect of light spectrum on the growth characteristics of in vitro cultures of Phalaenopsis was studied. The experiment design included three different light sources, namely white (control), blue and red light. The growth characteristics of the plantlets were selected as a dependent variable to establish a nonlinear growth model. The results sh...

Sweating measurement is a very useful tool for the physiological health state of the human body. A sweating measuring system developed in this study was composed of several sensors. All sensors were calibrated to ensure the accuracy. Three pretreatment physiological states for test subjects before sweating measurement included sit and rest for 5 mi...

The characteristics of thermistors for temperature measurement are the high sensitivity to yield a high resolution and the high accuracy in the narrow temperature range. This performance of this sensing element is affected by its calibration equation. Seven calibration equations were selected to evaluate the fitting agreement of the resistance–temp...

The effect of environment on plantlets grown under in vitro conditions has been observed by many researchers. However, a lack of concern for the basic assumptions of statistical methods used may produce incorrect conclusions. In this study, three light treatments were employed to observe the effect of light quality on the growth conditions of Phala...

Conductance moisture meters are generally easy to operate and respond rapidly. They are widely used for determining the moisture content of rough rice. In order to ensure the accuracy of moisture meters, the measurement uncertainty for two designs of meters, the farm-type sample-cell (CD-5) and inspection-type single-grain (CTR-E200) were evaluated...

The time-domain reflectometry (TDR) technology was applied in this study to measure sugar concentrations below 10%. The influences of temperature and species of sugars were evaluated. The results indicated that the TDR methods could be used for measuring sugar concentrations. The slope of TDR waveforms at a specific range was found to be a function...

Due to high solar intensity, the internal temperature of greenhouses in subtropical regions is so high that it is difficult for crops to survive. There are two types of shading nets that are applied to reduce the solar intensity entering the greenhouse. The purpose of this research is to develop a simple greenhouse model to describe the effect of t...

This study evaluates the sources of uncertainty for two types of humidity sensors. The standard humidity environment was made by several saturated salt solutions. These uncertainty sources include predicted values of calibration equation, reference humidity source, temperature variation effect, nonlinear and repeatability, and resolution source. Th...

Plant tissue culture is a very important technique for the development of the orchids industry. In order to enhance the quality of the plantlets, the microclimate in the culture vessel needs to be detected. An in situ, real time and continuous measurement system of in vitro plant tissue culture is very useful to study the physiological functions an...

The latent heat of vaporization of water in foodstuffs is an important factor for the design of drying equipments. The thermal properties can be calculated by equations that are derived directly from isotherm equations by the Clausius–Clapeyron thermodynamic theory. The sorption isosteric heat equation can be expressed as a function of temperature...

The method recommended by Eurachem did not mention the effect of adequateness of calibration equations on the measurement uncertainty. In this work, the sources of measurement uncertainty for two types of thermometer were evaluated. Three calibration equations were adopted to compare its predictive performance. These sources of combined uncertainty...

The cloning of plants can be produced in culture vessels by a micropropagation technique. It is popular to produce genetically uniform plantlets for the plant production industry to enhance profitability. Many culture vessels were placed on the shelves and many sets of successive horizontal shelves were arranged in the culture room. The fluorescent...

A nondestructive dry-weight estimation for growth models of Phalaenopsis was developed which allowed the area and dry weight of Phalaenopsis leaves to be estimated without removing leaves from the plants of four cultivars. Four dimensions of physical properties of Phalaenopsis leaves were measured in this study. These dimensions were length, maximu...

The relative humidity within the culture vessels is usually very high, resulting in poorly developed epicuticular wax layer and malfunctioning stomata of the plantlets. In this study, the humidity profile in the plant culture vessel was measured by the high polymer humidity sensor. The accuracy of these sensors was improved by calibration equations...

Sorption isotherms of pea seeds with three different treatments were measured by equilibrium relative humidity (ERH) determination technique at five temperatures. Four ERH models with a temperature term and the GAB model were adopted to evaluate the goodness-of-fit of sorption isotherms. Sorption data from literature were also selected to compare t...

Air temperature within culture vessels is a dominant factor influencing the growth of plantlets. A heat transfer model for tissue culture vessels was developed in this study. The heat source for vessels was irradiance from fluorescent tubes. The energy transfer included convective and radiative heat exchanges. In order to validate the model, two ty...

Evaporative cooling is an effective method to relieve the heat accumulation in a greenhouse in the summer, and to reduce the temperature of the greenhouse to a level lower than that of the outside air. A mathematical model was presented to describe the gradient of air temperature and relative humidity as a function of distance along an evaporative...

Thin-layer drying tests were conducted for rough rice in the temperature range of 35–60°C with five relative humidities (10–50% relative humidity (r.h.)). A modified precision humidity generator was used as an experimental device for this study. The temperatures and relative humidities of the drying air were controlled by the mixing of two air stre...

To measure the moisture content of grain, the equilibrium relative humidity (ERH) and temperature of the air environment in equilibrium with the grain were measured with temperature and humidity sensors. The humidity sensor readings were transformed by a previously established calibration equation. The moisture content was calculated by the known E...

The purpose of this research was to study the optimum strategy of the interrupted drying technique for rough rice. The effects of interrupted drying on drying rates, cracking enhancement ratios, and the performance of a commercial circulating rice dryer were evaluated. The results indicated that the required interrupted period of grains with moistu...

The equilibrium relative humidity (ERH) of rough rice, brown rice, corn kernels, corn cobs, soybeans, and red beans was measured at temperatures ranging from 5 to 50 °C. Four ERH models and their estimated parameters were evaluated for goodness-of-fit. Hysteresis effect was found for the ERH properties of rough rice, corn kernels, and corn cobs. Dr...

A rapid method has been developed to determine the sorption isotherms of peanuts. The equilibrium relative humidities ranging from 10 to 95% for peanut pods, kernels and hulls were measured at temperatures ranging from 5 to 45°C. No significant differences were found between the experimental results of the equilibrium moisture content and equilibri...

The three-parameter GAB equation was evaluated for its ability to describe the sorption data for several agricultural products. The GAB equation describes the relationship between equilibrium moisture content and equilibrium relative humidity (ERH) or water activity (Aw) at a fixed temperature. With Aw as the dependent variable, the equation become...

For analysis of thin-layer drying data, equilibrium moisture content (EMC) of grains is needed. Two methods to assess equilibrium moisture content values, one based on sorption data (static EMC, Mes) and the other based on non-linear regression of thin-layer drying data (dynamic EMC, Med), were investigated for application to the drying of corn and...