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- 저자 : Hao-Chuan Tsai (검색결과 4 건)
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Shih-Hao Yu,Fu-Der Mai,Wei-Yu Kao,Hui-Yen Tsai,Yu-Chuan Liu 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.127 No.-
Water is the most common solvent in our daily lives. This solvent has advantages of green environmentalprotection and low cost. Water is conventionally considered to be an inert solvent, yet it is relatively polarand can form a large number of hydrogen bonds (HBs). But this property also inhibits the dissolution ofmany non-polar gases, causing many important electrocatalytic reactions performed in it to have lowefficiencies. In this work, we propose an innovative application of solar energy-generated active purewater (APW) with reduced HBs to enhance chemical reactions and physical procedures. Compared toconventional deionized water (DIW), the generated APW possessed a lower specific heat of ca. 0.96. The swelling degree of artificial skin in APW significantly increased by ca. 29%. Moreover, the densityof an ethanol/APW solution significantly increased by 0.21% due to more free water molecules beingavailable in APW to form stronger HBs with ethanol. Encouragingly, efficiencies of hydrogen evolutionreactions performed in an APW-based acidic solution and oxygen evolution reactions performed in anAPW-based basic solution significantly increased by 42% and 17%, respectively, compared to DIWbasedsolutions. The developed APW based on utilizing solar energy can create a more-effective greenprocess.
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An Enhanced Password Authentication Scheme Providing Password Updating without Smart Cards
Chin-Chen Chang,Hao-Chuan Tsai,Yi-Hui Chen 보안공학연구지원센터 2007 International Journal of Security and Its Applicat Vol.1 No.2
In 2003, Yang, Chang, and Hwang proposed an enhanced scheme of Peyravivan-Zunic’s password authentication scheme by using the Diffie-Hellman scheme. Later, Yoon, Ryu, and Yoo demonstrated that Yang-Chang-Hwang’s scheme is vulnerable to a stolen-verifier attack and a denial-of-service attack, and then proposed an improved scheme. In this paper, we show that Yoon-Ryu-Yoo’s scheme is still vulnerable to a stolen-verifier attack and a server spoofing attack under some reasonable assumption. In addition, we propose an improved scheme to eliminate such security flaws.
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Initial Factors Influencing Duration of Hospital Stay in Adult Patients With Peritonsillar Abscess
Yu-Hsi Liu,Hsing-Hao Su,Yi-Wen Tsai,Yu-Yi Hou,Kuo-Ping Chang,Chao-Chuan Chi,Ming-Yee Lin,Pi-Hsiung Wu 대한이비인후과학회 2017 Clinical and Experimental Otorhinolaryngology Vol.10 No.1
Objectives. To review cases of peritonsillar abscess and investigate the initial clinical factors that may influence the duration of hospitalization. To determine the predictive factors of prolonged hospital stay in adult patients with peritonsillar abscess. Methods. Subjects were adults hospitalized with peritonsillar abscess. We retrospectively reviewed 377 medical records from 1990 to 2013 in a tertiary medical center in southern Taiwan. The association between clinical characteristics and the length of hospital stay was analyzed with independent t-test, univariate linear regression and multiple linear regression analysis. Results. The mean duration of hospitalization was 6.2±6.0 days. With univariate linear regression, a prolonged hospital stay was associated with several variables, including female gender, older ages, nonsmoking status, diabetes mellitus, hypertension, band forms in white blood cell (WBC) counts, and lower hemoglobin levels. With multiple linear regression analysis, four independent predictors of hospital stay were noted: years of age (P<0.001), history of diabetes mellitus (P<0.001), ratio of band form WBC (P<0.001), and hemoglobin levels (P<0.001). Conclusion. In adult patients with peritonsillar abscess, older ages, history of diabetes mellitus, band forms in WBC counts and lower hemoglobin levels were independent predictors of longer hospitalization.
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Fu-Jen Wang,Kuei-I Tsai,Yao-Jun Wang,Hao-Chuan Lee 대한기계학회 2011 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.25 No.2
Precise-manufacturing facilities, which emphasize accurate and stable machining of the working components to be used in semiconductor industry, cannot function properly without appropriate and precise cooling. HCFC (hydro-chloro-floro-carbon) has been commonly used as the coolant for precise manufacturing facilities; but it is facing the pressing schedule to be phased out. Additionally, the dramatic variation of heat load during high-accuracy and high-speed applications need a critical control of coolant (brine or water) temperature. Use of eco-friendly HFC 404A to replace HFC has been suggested as an effective alternative to alleviate the problems. In this study, the performance of a process cooling system retrofitted with HFC-404A refrigerant was evaluated; the energy efficiency ratio and accuracy of temperature control specific to -15℃ precise manufacturing application were examined. Effects of using thermostatic expansion valve associated with hot-gas by-pass control scheme under different loading conditions have been investigated extensively. The energy efficiency ratio and accuracy of temperature control for the cooling system were measured and analyzed for comparing and evaluating HCFC-22 and HFC-404A using different throttling devices under specific coolant temperatures. The comprehensive studies on improving the accuracy of temperature control and energy-saving efficiencies through different temperature control strategies are presented in this paper.
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