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Chang, Yung-Shan,Choi, Mingi,Baek, Minki,Hsieh, Ping-Yen,Yong, Kijung,Hsu, Yung-Jung Elsevier 2018 Applied Catalysis B Vol.225 No.-
<P><B>Abstract</B></P> <P>In this study, we have synthesized CdS/CdSe co-sensitized brookite TiO<SUB>2</SUB> nanostructures with hydrogen doping (H:TiO<SUB>2</SUB>/CdS/CdSe) in a facile solution reaction and studied their PEC performances. Compared to undoped brookite TiO<SUB>2</SUB>, the H:TiO<SUB>2</SUB>/CdS/CdSe composites exhibit much enhanced photocurrent generation, which originates from the improved charge transfer kinetics endowed by hydrogen doping and sensitization. Time-resolved photoluminescence (PL) and electrochemical impendence spectroscopy (EIS) are employed to explore the charge transfer dynamics between sensitizers and TiO<SUB>2</SUB> and charge carrier kinetics at the semiconductor/electrolyte interface. According to the analytical results, sensitizations of TiO<SUB>2</SUB> are found to enhance the charge separation efficiency. Besides, the hydrogen doping into TiO<SUB>2</SUB> generates oxygen vacancy states, providing additional charge transfer pathway and prohibiting charge recombination, beneficial for enhancing the PEC performances as well. Based on the charge dynamics data, we further develop charge transfer models for TiO<SUB>2</SUB>/CdS/CdSe and H:TiO<SUB>2</SUB>/CdS/CdSe. The findings from this work can help understanding the charge transfer dynamics in brookite TiO<SUB>2</SUB>-based composite systems as well as designing versatile photoelectrodes for solar energy conversion.</P> <P><B>Highlights</B></P> <P> <UL> <LI> CdS/CdSe co-sensitized brookite H:TiO<SUB>2</SUB> exhibit much enhanced photoactivity. </LI> <LI> Superiority of H:TiO<SUB>2</SUB>/CdS/CdSe results from the improved charge transfer. </LI> <LI> Practical use for photoelectrochemical hydrogen production was demonstrated. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Chuan-Yuan Hsu,Jongsun Kim,Ping Chang,Steven F. DiMarco 한국해양과학기술원 2022 Ocean science journal Vol.57 No.1
This study investigates the resonated diurnal impact of the surface wind forcing from several atmospheric wind products, including CCMP (Cross-Calibrated Multi-Platform), ERA Interim, NCEP-2 (NCEP-DOE AMIP-II Reanalysis), MERRA (Modern-Era Retrospective analysis for Research and Application), NARR (Northern American Regional Reanalysis) and NAM (North American Mesoscale Forecast System), on the wind-driven near-inertial ocean motions in the northern Gulf of Mexico by numerical simulation, and in comparison, with NDBC buoy surface observed winds. Our analyses show that the near-inertial wind power input, which can affect vertical mixing in the water column, is closely associated with the variability of land-sea breeze by various wind products. In comparison with buoy observations in the northern Gulf of Mexico, the MERRA has the worst land-sea breeze representation, while the NCEP2 and CCMP, which are chosen to represent the coarsest and medium–high horizontal resolution, have the best performance. We further show that by comparison of the buoy data, that the near-inertial wind power input derived from all the wind products is underestimated by 30–50% approximately.
Advanced Imaging of Nanometer-Scale Recorded Bits on Super-Resolution Near-Field Optical Disk
Pei Lin Yang,Din Ping Tsai,Cheng Wei Lin,Chih Ching Hsu,Pei Hsin Chang,Tsung Sheng Kao,Wei Chih Lin 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.47 No.1
An advanced imaging technique is demonstrated for fast, non-destructive and high resolution characterizations for nanometer-scale recorded bits on a super-resolution near-field optical disk (super-RENS). For the first time, an array of individual 100 nm recorded marks is imaged and studied by using the conductive-atomic force microscopy (C-AFM) method. Discussions also include comparisons of 300 nm, 200 nm and 100 nm recorded marks on both a super-RENS disk and a commercial DVD disk, and the image results are evidence of the high carrier-to-noise ratio (CNR) value on the super-RENS disk, even though the mark size has been shrunk to less than the diffraction limit.
Data Hiding for HTML Files Using Character Coding Table and Index Coding Table
( Yung-chen Chou ),( Ping-kun Hsu ),( Iuon-chang Lin ) 한국인터넷정보학회 2013 KSII Transactions on Internet and Information Syst Vol.7 No.11
A data hiding scheme in HTML files is presented in this paper. Web pages are a very popular medium for broadcasting information and knowledge nowadays, and web pages are a good way to achieve the goal of secret message delivery because the different HTML coding codes will render the same screen in any of the popular browsers. The proposed method utilizes the HTML special space codes and sentence segmentation to conceal secret messages into a HTML file. The experimental results show that the stego HTML file generated by the proposed method is imperceptible. Also, the proposed method can conceal one more secret bit in every between-word location.
TOSS: Telecom Operations Support Systems for Broadband Services
Chen, Yuan-Kai,Hsu, Chang-Ping,Hu, Chung-Hua,Lin, Rong-Syh,Lin, Yi-Bing,Lyu, Jian-Zhi,Wu, Wudy,Young, Hey-Chyi Korea Information Processing Society 2010 Journal of information processing systems Vol.6 No.1
Due to the convergence of voice, data, and video, today's telecom operators are facing the complexity of service and network management to offer differentiated value-added services that meet customer expectations. Without the operations support of well-developed Business Support System/Operations Support System (BSS/OSS), it is difficult to timely and effectively provide competitive services upon customer request. In this paper, a suite of NGOSS-based Telecom OSS (TOSS) is developed for the support of fulfillment and assurance operations of telecom services and IT services. Four OSS groups, TOSS-P (intelligent service provisioning), TOSS-N (integrated large-scale network management), TOSS-T (trouble handling and resolution), and TOSS-Q (end-to-end service quality management), are organized and integrated following the standard telecom operation processes (i.e., eTOM). We use IPTV and IP-VPN operation scenarios to show how these OSS groups co-work to support daily business operations with the benefits of cost reduction and revenue acceleration.
Tien, Chu-Yeh,Kuei, Ping-Yu,Chang, Liann-Be,Hsu, Chien-Pin The Korean Institute of Electrical Engineers 2015 Journal of Electrical Engineering & Technology Vol.10 No.4
The performance of the AlGaN/GaN MSM-2DEG varactor with different dielectric films deposited by the E-beam deposition is investigated in detail. The capacitance swing and the capacitance ratio of the varactor without dielectric film as well as with, SiO<sub>2</sub>, Gd<sub>2</sub>O<sub>3</sub>, and Si<sub>3</sub>N<sub>4</sub> films, respectively, are determined by electrodes of varying areas. The maximum capacitance, the minimum capacitance and the capacitance ratios are proportional to the increasing of the electrode areas. The capacitance ratio determined by the maximum and the minimum capacitance is found to be 18.35 (with Si<sub>3</sub>N<sub>4</sub> dielectric film) and 149.51 (without dielectric film), respectively. The transition voltages of the fabricated varactors are almost the same for a bias voltage of about ±5 V and leakage current can be lower three orders of magnitude while the varactors with dielectric films. The tunability of the capacitance ratio makes the AlGaN/GaN MSM-2DEG varactor with a dielectric film highly useful in multirange applications of a surge free preamplier.
Chu-Yeh Tien,Ping-Yu Kuei,Liann-Be Chang,Chien-Pin Hsu 대한전기학회 2015 Journal of Electrical Engineering & Technology Vol.10 No.4
The performance of the AlGaN/GaN MSM-2DEG varactor with different dielectric films deposited by the E-beam deposition is investigated in detail. The capacitance swing and the capacitance ratio of the varactor without dielectric film as well as with, SiO2, Gd2O3, and Si3N4 films, respectively, are determined by electrodes of varying areas. The maximum capacitance, the minimum capacitance and the capacitance ratios are proportional to the increasing of the electrode areas. The capacitance ratio determined by the maximum and the minimum capacitance is found to be 18.35 (with Si3N4 dielectric film) and 149.51 (without dielectric film), respectively. The transition voltages of the fabricated varactors are almost the same for a bias voltage of about ±5 V and leakage current can be lower three orders of magnitude while the varactors with dielectric films. The tunability of the capacitance ratio makes the AlGaN/GaN MSM-2DEG varactor with a dielectric film highly useful in multirange applications of a surge free preamplier.