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Enhancing Quality Teaching in Operations Management: An Action Learning Approach
YAM Richard C.M.,PUN Kit Fai The Korean Society for Quality Management 2005 The Asian Journal on Quality Vol.6 No.1
Action learning motivates students to solve open-ended problems by 'developing skills through doing'. This paper reviews the concept of action learning and discusses the adoption of action learning approach to teach operations management at universities. It presents the design and delivery of an action-learning course at City University of Hong Kong. The course incorporates classroom lectures, tutorials and an action-learning workshop. The experience gained proves that action learning facilitates student participation and teamwork and provides a venue of accelerating learning where enables students to handle dynamic problem situations more effectively. The paper concludes that adopting action-learning approach can help lecturers to enhance quality teaching in operations management courses, and provide an alternate means of effective paradigm other than traditional classroom teaching and/or computer-based training at universities.
Ultrasound-guided percutaneous nephrolithotomy: Advantages and limitations
Foo Cheong Ng,Wai Loon Yam,Tze Ying Benjamin Lim,Jin Kiat Teo,Kok Kit Ng,Sey Kiat Lim 대한비뇨의학회 2017 Investigative and Clinical Urology Vol.58 No.5
Purpose: The use of ultrasound in percutaneous nephrolithotomy (PCNL) has not been shown to translate to better clinical and stone outcomes. To compare the operative outcomes, postoperative outcomes and complication rates of ultrasound-guided access PCNL (USGA-PCNL) versus fluoroscopy-guided access PCNL (FGA-PCNL). Materials and Methods: A total of 184 consecutive patients who underwent PCNL from July 2008 to September 2014 were identified from our PCNL database. Seventy-two patients underwent USGA-PCNL and 112 FGA-PCNL. Results: The patients were similar in age, sex, race, American Society of Anesthesiologists physical status classification, mean largest stone diameters, side of PCNL, number of stones and the degree of hydronephrosis between both groups. There were higher rates of upper pole (5.6% vs. 3.6%), mid pole (8.3% vs. 2.7%) and multiple pole punctures (4.2% vs. 0%) in USGA-PCNL compared to FGA-PCNL (p=0.027). There was no difference in the stone free rates of both groups in univariate analysis. Those who had FGA-PCNL were 2.26 (95% confidence interval, 1.09–4.75; p=0.029) times more likely to require a second-look procedure compared to USGA-PCNL on univariate analysis but not on multivariate analysis. There were no differences in Clavien-Dindo complications. No patient in the USGA-PCNL group experienced organ injuries during puncture compared to 1 patient in the FGA-PCNL group who had pneumothorax requiring urgent chest tube insertion. Conclusions: The use of ultrasonography to guide access puncture during PCNL eliminates the risk of inadvertent organ injuries. Similar operative and stone outcomes show that the learning curve for USGA is minimal compared to conventional FGA.
Chen, Xi,Lee, Dong Sun,Zhu, Xuntao,Yam, Kit L. American Chemical Society 2012 Journal of agricultural and food chemistry Vol.60 No.13
<P>This paper investigated the feasibility of manipulatingpackagingpolymers with various degrees of hydrophobicity to release two antioxidants,tocopherol and quercetin, at rates suitable for long-term inhibitionof lipid oxidation in food. For example, one antioxidant can be releasedat a fast rate to provide short-term/intermediate protection, whereasthe other antioxidant can be released at a slower rate to provideintermediate/long-term protection of lipid oxidation. Controlled-releasepackaging films containing tocopherol and quercetin were producedusing ethylene vinyl alcohol (EVOH), ethylene vinyl acetate (EVA),low-density polyethylene (LDPE), and polypropylene (PP) polymers;the release of these antioxidants to 95% ethanol (a fatty food simulant)was measured using UV–vis spectrophotometry, and Fickian diffusionmodels with appropriate initial and boundary conditions were usedto fit the data. For films containing only quercetin, the resultsshow that the release of quercetin was much faster but lasted fora much shorter time for hydrophilic polymers (EVOH and EVA) than forhydrophobic polymers (LDPE and PP). For binary antioxidant films containingtocopherol and quercetin, the results show that tocopherol releasedmore rapidly but for a shorter period of time than quercetin in LDPEand EVOH films, and the difference is more pronounced for LDPE filmsthan EVOH films. The results also show the presence of tocopherolcan accelerate the release of quercetin. Although none of the filmsproduced is acceptable for long-term lipid oxidation inhibition, thestudy provides encouraging results suggesting that acceptable filmsmay be produced in the future using polymer blend films.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jafcau/2012/jafcau.2012.60.issue-13/jf2045813/production/images/medium/jf-2011-045813_0006.gif'></P>
Lee, Dong-Sun,Kim, Hwan-Ki,An, Duck-Soon,Yam, Kit L. The Korean Society of Food Science and Nutrition 2011 Preventive Nutrition and Food Science Vol.16 No.4
Levels of carbon dioxide gas, a metabolite of microbial growth, have been reported to parallel the onset of microbial spoilage and may be used as a convenient index for a packaged food's shelf life. This study aimed to establish a kinetic model of $CO_2$ production from perishable food for the potential use for shelf life control in the food supply chain. Aerobic bacterial count and package $CO_2$ concentration were measured during the storage of seasoned pork meat at four temperatures (0, 5, 10 and $15^{\circ}C$), and their interrelationship was investigated to establish a mathematical model. The microbial growth at constant temperature was described by using model of Baranyi and Roberts. $CO_2$ production from the stored food could be explained by taking care of its yield and maintenance factors linked to the microbial growth. By establishing the temperature dependence of the microbial growth and $CO_2$ yield factor, $CO_2$ partial pressure or concentration in package headspace could be estimated to a limited extent, which is helpful for controlling the shelf life under constant and dynamic temperature conditions. Application and efficacy of the model needs to be improved with further refinement in the model.