scholarly journals The Comparisons of Real-time Ammonia Adsorption Measurement in Varying Inlet Tubes and the Different Ammonia Measurement Methods in the Atmosphere

2021 ◽  
Vol 15 (4) ◽  
pp. 93-102
Author(s):  
Kyunghoon Kim ◽  
Gyutae Park ◽  
Seokwon Kang ◽  
Rahul Singh ◽  
Jeongin Song ◽  
...  
Keyword(s):  
Real Time ◽  
Measurement Methods ◽  
Ammonia Adsorption ◽  
Adsorption Measurement

scholarly journals A study on the development of a light scattering particulate matter sensor and monitoring system

2020 ◽  
Vol 17 (3) ◽  
pp. 867-890
Author(s):  
Jun-Hee Choi ◽  
Hyun-Sug Cho
Keyword(s):  
Big Data ◽  
Particulate Matter ◽  
Light Scattering ◽  
Real Time ◽  
Monitoring System ◽  
Low Cost ◽  
Gravimetric Method ◽  
Correction Method ◽  
Measurement Methods ◽  
Linear Correction

The gravimetric method, which is mainly used among particulate matter (PM) measurement methods, includes the disadvantages that it cannot measure PM in real time and it requires expensive equipment. To overcome these disadvantages, we have developed a light scattering type PM sensor that can be manufactured at low cost and can measure PM in real time. We have built a big data system that can systematically store and analyze the data collected through the developed sensor, as well as an environment where PM states can be monitored mobile in real time using such data. In addition, additional studies were conducted to analyze and correct the collected big data to overcome the problem of low accuracy, which is a disadvantage of the light scattering type PM sensor. We used a linear correction method and proceeded to adopt the most suitable value based on error and accuracy.

A Laboratory Intercomparison of Real-Time Gaseous Ammonia Measurement Methods

2007 ◽  
Vol 41 (24) ◽  
pp. 8412-8419 ◽  
Author(s):  
James J. Schwab ◽  
Yongquan Li ◽  
Min-Suk Bae ◽  
Kenneth L. Demerjian ◽  
Jian Hou ◽  
...  
Keyword(s):  
Real Time ◽  
Measurement Methods ◽  
Gaseous Ammonia ◽  
Laboratory Intercomparison

The Research and Realization of Capacitive Current on Line Measurement Based on DSP

2012 ◽  
Vol 195-196 ◽  
pp. 195-199
Author(s):  
Jian Wen Wang ◽  
Zheng Feng Wang ◽  
Peng Li
Keyword(s):  
Measurement Error ◽  
Real Time ◽  
Measurement Methods ◽  
Current Measurement ◽  
Capacitive Current ◽  
Line Measurement ◽  
On Line ◽  
Capacitance Current ◽  
Signal Method

In the paper, it proceeds in-depth research and analysis to the existing capacitance current measurement methods, and the infuse signal method is chosen to achieve capacitance current accurate measurement on this basis. The method has the advantage of measurement error small, real-time good and safe reliable.

scholarly journals Haze Image Recognition Based on Brightness Optimization Feedback and Color Correction

Information ◽  
2019 ◽  
Vol 10 (2) ◽  
pp. 81 ◽  
Author(s):  
Shengyu Hao ◽  
Peiyi Wang ◽  
Yanzhu Hu
Keyword(s):  
Real Time ◽  
Image Recognition ◽  
Feature Matching ◽  
Color Correction ◽  
Measurement Methods ◽  
High Quality ◽  
Butterworth Filter ◽  
Time Operation ◽  
Real Time Operation ◽  
Images Processing

At present, the identification of haze levels mostly relies on traditional measurement methods, the real-time operation and convenience of these methods are poor. This paper aims to realize the identification of haze levels based on the method of haze images processing. Therefore, this paper divides the haze images into five levels, and obtains the high-quality haze images in each level by the brightness correction of the optimization solution and the color correction of the feature matching. At the same time, in order to reduce the noise of the haze images, this article improved the Butterworth filter. Finally, based on the processed haze images, this paper uses the Faster R-CNN network to identify the haze levels. The results of multiple sets of comparison experiments demonstrate the accuracy of the study.

scholarly journals Time Sequential Motion-to-Photon Latency Measurement System for Virtual Reality Head-Mounted Displays

Electronics ◽  
2018 ◽  
Vol 7 (9) ◽  
pp. 171 ◽  
Author(s):  
Song-Woo Choi ◽  
Siyeong Lee ◽  
Min-Woo Seo ◽  
Suk-Ju Kang
Keyword(s):  
Virtual Reality ◽  
Real Time ◽  
Measurement Methods ◽  
The Other ◽  
Time Points ◽  
Physical Motion ◽  
Head Mounted Displays ◽  
Input Time ◽  
Measurement Area ◽  
Motion Generator

Because the interest in virtual reality (VR) has increased recently, studies on head-mounted displays (HMDs) have been actively conducted. However, HMD causes motion sickness and dizziness to the user, who is most affected by motion-to-photon latency. Therefore, equipment for measuring and quantifying this occurrence is very necessary. This paper proposes a novel system to measure and visualize the time sequential motion-to-photon latency in real time for HMDs. Conventional motion-to-photon latency measurement methods can measure the latency only at the beginning of the physical motion. On the other hand, the proposed method can measure the latency in real time at every input time. Specifically, it generates the rotation data with intensity levels of pixels on the measurement area, and it can obtain the motion-to-photon latency data in all temporal ranges. Concurrently, encoders measure the actual motion from a motion generator designed to control the actual posture of the HMD device. The proposed system conducts a comparison between two motions from encoders and the output image on a display. Finally, it calculates the motion-to-photon latency for all time points. The experiment shows that the latency increases from a minimum of 46.55 ms to a maximum of 154.63 ms according to the workload levels.

scholarly journals Method of Calculating Short-Wavelength-Ratio-Based Color Temperature Supporting the Measurement of Real-Time Natural Light Characteristics through RGB Sensor

Sensors ◽  
2020 ◽  
Vol 20 (22) ◽  
pp. 6603
Author(s):  
Seung-Taek Oh ◽  
Geon-Woo Jeon ◽  
Jae-Hyun Lim
Keyword(s):  
Real Time ◽  
Short Wavelength ◽  
Measuring Equipment ◽  
Measurement Methods ◽  
Color Temperature ◽  
Average Error ◽  
Natural Light ◽  
Average Error Rate ◽  
Chromaticity Coordinates ◽  
Specialized Measuring

The characteristics of natural light are mostly collected through specialized measuring equipment, such as a spectroradiometer, and some suggested measurement methods through a small RGB sensor. However, specialized measuring equipment presents difficulty in its high cost, and the RGB-sensor-based method has the limitation of being unable to measure the wavelength characteristics of natural light that are needed to implement lighting that supports circadian rhythms. This paper presents a method for calculating the short-wavelength-ratio-based color temperature of natural light in real time. First, an analysis of the correlation between the characteristics of natural light collected through a spectroradiometer was performed to determine the factors that were needed to accurately measure the color temperature of natural light. Then, the short-wavelength ratio of natural light was calculated through chromaticity coordinates (x and y), which are output values of the RGB sensor, and an equation for calculating the color temperature of natural light was derived through the short-wavelength ratio. Furthermore, after producing an RGB-sensor-based device, the derived equation was applied to calculate the color temperature of real-time natural light that reflects the wavelength characteristics. Then, as a result of the performance evaluation of the proposed method, the color temperature of natural light was accurately calculated within 1% of the average error rate.

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