Browsing by Author "Huang, Shih-Hsuan"

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A multinomial choice model approach for dynamic driver vision transitions
(2015-01-01)
Huang, Shih-Hsuan
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Wong, Jinn-Tsai
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運輸與物流管理系註：原交通所+運管所
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Department of Transportation and Logistics Management
Exploring the continual process of drivers allocating their attention under varying conditions could be vital for preventing motor vehicle crashes. This study aims to model visual behaviors and to estimate the effects of various contributing factors on driver\'s vision transitions. A visual attention allocation framework, based on certain contributing attributes related to driving tasks and environmental conditions, has been developed. The associated logit type models for determining driver choices for focal points were successfully formulated and estimated by using naturalistic glance data from the 100-car event database. The results offer insights into driver visual behavior and patterns of visual attention allocation. The three focal points that drivers most frequently rely on and glance at are the forward, left and rear view mirror. The sample drivers were less likely to demonstrate troublesome transition patterns, particularly in mentally demanding situations. Additionally, instead of shifting vision directly between two non-forward focal points, the sample drivers frequently had an intermediate forward glance. Thus, seemingly unrelated paths could be grouped into explanatory patterns of driver attention allocation. Finally, in addition to the vision-transition patterns, the potential pitfalls of such patterns and possible countermeasures to improving safety are illustrated, focusing on situations when drivers are distracted, traveling at high speeds and approaching intersections. (c) 2014 Elsevier Ltd. All rights reserved.
A New Cross-Flow Tube Bundle Heat Exchanger with Staggered Hot and Cold Tubes for Thermophoretic Deposition of Submicron Aerosol Particles
(2009)
Chien, Chih-Liang
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Huang, Shih-Hsuan
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Tsai, Chuen-Jinn
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環境工程研究所
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Institute of Environmental Engineering
A new tube cross-flow bundle heat exchanger has been designed and tested for thermophoretic deposition of submicron aerosol particles. The present design has five columns of hot and cold square tubes, respectively, arranged in a staggered manner to maintain a nearly constant temperature gradient in the direction of the aerosol flow. Each column has four tubes of 4 mm x 4 mm in cross section and the gap between the tube surfaces is 0.5 mm. The precipitator was tested experimentally using monodisperse NaCl test particles ranging from 38 to 397 nm in diameter at the aerosol flow rate of 0.6 and 1.2 L/min, respectively, at different temperature gradients. Results showed that the thermophoretic deposition efficiency increased with decreasing aerosol flow rate and increasing temperature gradient with the maximum thermophoretic deposition efficiency occurred at the aerosol flow rate of 0.6 L/min. The effect of inlet temperature of the aerosol flow on the efficiency was also tested and showed increasing inlet temperature increased the deposition efficiency. Numerical simulation was further conducted to validate the experimental data and good agreement was obtained. An empirical equation was also validated to facilitate the design and scale-up of the precipitator.
Attention allocation patterns in naturalistic driving
(2013-09-01)
Wong, Jinn-Tsai
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Huang, Shih-Hsuan
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運輸與物流管理系註：原交通所+運管所
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Department of Transportation and Logistics Management
The key to safe driving is the adequate distribution of the driver's attention to the forward area and to other non-forward focal points. However, thus far, current methods are not able to well quantify the entire process of a driver's attention allocation. Therefore, this study proposed a novel concept of renewal cycles for representing and analyzing driver attention allocation. Using the 100-car naturalistic glance data, this study found that 90.74% of drivers' attention allocations were 2-glance renewal cycles. The findings suggest that the sample drivers usually separated their lapses of attention from the forward direction into several sequences by directing their vision back to the forward direction after each visual shift away from it. In addition, although a markedly smaller number of cycles were more than 3-glances (2.09% renewal cycles), drivers were certainly less aware of the frontal area and at a higher risk of having an accident during such cycles. This finding might have striking implications for accident prevention. This area of study deserves further attention. Among the generated renewal cycles, lots of them repeated frequently, especially cycles related to invehicle distractions. To analyze the different characteristics among various attributes, distribution of the common renewal cycles under different conditions was examined. As expected, drivers displayed different renewal cycles under various road conditions and with various driver intentions. Although these sample drivers were not representative, the preliminary research results were promising and fruitful for potential applications, particularly educating novice drivers. (C) 2013 Elsevier Ltd. All rights reserved.
Augmenting Car Surrounding Information by Inter-Vehicle Data Fusion
(2019-01-01)
Lee, Tzu-Kuang
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Kuo, Yu-Chiao
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Huang, Shih-Hsuan
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Wang, Guan-Sheng
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Lin, Chih-Yu
Collecting vehicle surrounding information is a key issue for accident prevention and autonomous driving applications. Although GPS and 4G/LTE are widely accepted. it is still a challenge for a vehicle to get complete information of its surrounding vehicles. In this work, we consider the integration of multi-sensory data through V2V communications to help a vehicle to understand its complex surroundings. We propose a fusion algorithm that can integrate four types of sensory inputs: V2V communications, GPS, camera, and inertial data. We show that through such fusion, it is possible for a vehicle to visually see the driving states of its surrounding vehicles.
Determinants behind young motorcyclists' risky riding behavior
(2010-01-01)
Wong, Jinn-Tsai
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Chung, Yi-Shih
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Huang, Shih-Hsuan
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運輸與物流管理系註：原交通所+運管所
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Department of Transportation and Logistics Management
Young motorcyclists have traditionally been considered a high-risk population. Given the critical influence of riders' behaviors on traffic safety, identifying what riders think can help clarify the nature of accidents. Although psychological studies have explored the relationships among personality traits, attitudes and risky driving behavior, the primary difference this study makes from past studies is incorporating both positive and negative effects in a refined causal framework. This study adopts structural equation modeling to analyze data collected from 683 young motorcyclists aged between 18 and 28. The results conclude three primary personality traits of young motorcyclists, namely sensation seeking, amiability and impatience. While amiable riders represent a group of relatively mature and safe riders, the sensation-seeking riders are extremely self-confident, comfortable with unsafe riding and interested in the utility gained from it. Meanwhile, the sensation-seeking ones also are highly aware of traffic conditions, which may lower the chances of getting into an accident, but the accident could be extremely severe if it ever occurs. Impatient riders, having low riding confidence and traffic awareness deficiency, also seek utility from certain risky riding behaviors. However, their fear of an accident leads them to fail to observe surrounding traffic conditions. The result indicates various mental compromise mechanisms for young motorcyclists in conducting riding behaviors. Thus, corresponding countermeasures, including licensure system and ITS roadway development, should consider the heterogeneous characteristics of young riders. (C) 2009 Elsevier Ltd. All rights reserved.
Negative threshold voltage shift for LTPS TFTs under x-ray irradiation and gate bias
(2019-09-01)
Tai, Ya-Hsiang
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Yeh, Shan
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Chan, Po-Chun
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Li, Yi-Shen
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Huang, Shih-Hsuan
In this paper, the behavior of the low-temperature polycrystalline-silicon (LTPS) thin film transistors (TFTs) during x-ray irradiation and gate bias voltage (V-G) simultaneously is analyzed. Both n-type and p-type LTPS TFTs show negative shifts of threshold voltage under same dose of x-ray irradiation, regardless of the V-G polarity, while the field effect mobility of n-type LTPS TFT keeps fairly well. The degradation of subthreshold swing is attributed to the interface states, which can be repaired by 300 degrees C annealing. A model is proposed to explain the results for different V-G, and verified by changing the thickness of the gate oxide. More irradiation-induced holes are trapped by the far defects owing to the electric field. This study can be helpful to develop more stable devices or circuits for the application of x-ray image sensors.
Simulation and testing of pollutant dispersion during preventive maintenance in a cleanroom
(2009-12-01)
Shih, Hui-Ya
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Huang, Shih-Hsuan
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Li, Shou-Nan
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Chen, Sheng-Chieh
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Tsai, Chuen-Jinn
Sulfur hexafluoride (SF(6)) of >99.9% purity was artificially released to simulate the emission sources in the etching-thin film area of a working cleanroom in a semiconductor fab at the rate of 492 g/h. Three mobile Fourier transform infrared spectrometers (FTIRs, detection limit: 10 ppb) were used simultaneously to measure the real time SF6 concentrations at different locations of the cleanroom. A three-dimensional numerical model was also used to predict the unsteady gas concentration distribution and the results were compared with the experimental data. Due to high dilution of the pollutant in the cleanroom, it is found that the current gas sensors may not be sensitive enough and a better monitoring system and strategy is needed to protect workers from injury and to ensure good product yield. After comparison with the validated numerical results. the well-mixed model is found to predict the peak pollutant concentrations within a reasonable range which is 0.34-1.33 times the experimental values except when the monitored distance is very close to the release point. The well-mixed model is shown to be capable of predicting a reasonable attainable maximum concentration once a pollutant leaks in the cleanroom. (C) 2009 Elsevier Ltd. All rights reserved.
Spatial and Temporal Distributions of a Gaseous Pollutant During Simulated Preventive Maintenance and Pipe Leaking Events in a Working Cleanroom
(2009-08-01)
Huang, Shih-Hsuan
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Shih, Hui-Ya
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Li, Shou-Nan
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Chen, Sheng-Chieh
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Tsai, Chuen-Jinn
Sulfur hexafluoride (SF(6)) of > 99.9% in purity was artificially released to simulate the emission sources in the etching/thin-film area of a working cleanroom in a semiconductor fab at the rate of 492 g/h. The temporal and spatial dispersion patterns of the gas pollutant were studied during the simulated preventive maintenance ( PM) and pipe leaking exhaust events experimentally and numerically. Three mobile Fourier transform infrared spectrometers (FTIRs, detection limit: 10 ppb) were used simultaneously to measure the real time SF(6) concentrations in different locations of the etching/thin-film area of the cleanroom. An additional open-path FTIR with very low detection limit of 0.4 ppb was installed before the recirculation duct in the lithography area to monitor if the pollutant drifted from the etching/thin-film area to the lithography area. The results show that the 3-D numerical model predicts the unsteady gas concentration accurately in both the peak concentration and the time required to reach the peak concentration. Due to high dilution of the pollutant in the cleanroom, the current gas sensors may not be sensitive enough and a better monitoring system and strategy is needed to protectworkers from injury and ensure good product yield. The well-mixed model predicts the peak pollutant concentrations within a reasonable range which is 0.34-1.33 times the experimental values except when the monitored distance is very close to the release point. Although it is not able to predict the time required to reach the peak concentration and the time for the concentration to drop below a small level, the simple well-mixed model can be used to obtain an estimation of the peak concentration quickly when the emission rate and the ventilation condition of the cleanroom are different than the current study.
Total-Dose Effect of X-ray Irradiation on Low-Temperature Polycrystalline Silicon Thin-Film Transistors
(2020-06-01)
Tai, Ya-Hsiang
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Yeh, Shan
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Huang, Shih-Hsuan
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Chang, Ting-Chang
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電機學院
In this paper, the total-dose effect of X-ray irradiation on low-temperature polycrystalline-silicon (LTPS) thin film transistors (TFTs) is studied. Experiments under different conditions, including fixed intensity, fixed time, fixed total dose, short shot with different frequencies and high/low intensity for short/long time were performed and analyzed. With an increase of the irradiation dose, the threshold voltage (Vth) shifts negatively, the subthreshold swing (S.S.) degrades and the field effect mobility decreases owing to positive trapped charges and interface traps. All magnitude of negative shifts of (Vth), (S. S.) and field effect mobility for LTPS TFTs are well correlated to the total accumulated dose. The results are consistent with (Vth) shift due to trapped holes and the interface traps for mobility.
Total-Dose Effect of X-ray Irradiation on Low-TemperaturePolycrystalline Silicon Thin-Film Transistors (vol 41, pg 864, 2020)
(2020-09-01)
Tai, Ya-Hsiang
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Yeh, Shan
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Huang, Shih-Hsuan
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Chang, Ting-Chang
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電機學院
In The above article [1], the Acknowledgment was deleted in error. Therefore, the Acknowledgment is added below. This change had no influence on the discussion and conclusions in the article.
TUBE BUNDLE HEAT EXCHANGER OF CONSTANT TEMPERATURE GRADIENT FOR THERMOPHORETIC DEPOSITION OF AEROSOL PARTICLES
(2010-05-13)
TSAI, Chuen-Jinn
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Huang, Shih-Hsuan
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Chien, Chih-Liang
This invention is a tube bundle heat exchanger for thermophoretic deposition of aerosol particles. It has a housing with an internal chamber, and several cold and hot tubes. The cold and hot tubes are arranged in a staggered manner in the internal chamber of the housing. Low and high temperature fluids flow inside the cold and hot tubes, respectively. When the exhaust gas passes through the chamber, temperature gradient between the cold and hot tubes causes aerosol particles suspended in the exhaust gas to deposit on the surface of cold tubes to achieve the treatment of exhaust gas. Staggered arrangement of cold and hot tubes can maintain nearly constant temperature gradient in the direction of the gas flow thereby enhances the overall removal efficiency of particles.