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Chet Yeng Loong 한국음악교육학회 2014 음악교육연구 Vol.43 No.4
이 글은 ADHD 학생에 대해 이해의 시작단계에 있는 교육·음악교육전공 대학생들을 위해 쓰여졌으며, 미국에서 사용된 전략들에 바탕을 두고 있다. 이 글의 논의가 ADHD에 제한되어 있기는 하지만, 장애아동들을 위해 널리 활용될 수 있으리라 생각한다. 본 연구자는 또한 초등학교, 중등학교, 대학교 수준, 특히 통합수업에서 사용될 수 있는 전략과 접근법들을 제공하였다. 교육·음악교육 전공자들은 미래의 수업에서 이러한 전략들을 적용할 수 있지만, 특수교육 관련 문헌과 제시한 웹사이트의 자료들을 통해 더 많은 자료들을 얻길 바란다.
Bandwidth Efficient Digital Communication with Wavelet Approximations
Lo, Chet,Moon, Todd K. The Korea Institute of Information and Commucation 2002 Journal of communications and networks Vol.4 No.2
Based on their shift and scale orthogonality properties, scaling and wavelet functions may be used as signaling functions having good frequency localization as determined by the fractional-out-of-band power (FOOBP). In this paper, application of Daubechies' wavelet and scaling functions as baseband signaling functions is described, with a focus on finding discretely realizable pulse-shaping transfer function circuits whose outputs approximate scaling and wavelet functions when driven by more conventional digital signaling waveforms. It is also shown that the inter-symbol interference (ISI) introduced by the approximation has negligible effect on the performance in terms of signal-to-noise ratio (SNR). Moreover, the approximations are often more bandwidth efficient than the original wavelet functions. These waveforms thus illustrate an example solution of a tradeoff between residual ISI and bandwidth efficiency as a signal design problem.
Bin Chet Toh,Jingli Chong,Baldwin PM Yeung,Chin Hong Lim,Eugene KW Lim,Weng Hoong Chan,Jeremy TH Tan 대한소화기내시경학회 2022 Clinical Endoscopy Vol.55 No.3
Background/Aims: Surgeons and endoscopists have started to use endoscopically inserted double pigtail stents (DPTs) in the managementof upper gastrointestinal (UGI) leaks, including UGI anastomotic leaks. We investigated our own experiences in this patient population. Methods: From March 2017 to June 2020, 12 patients had endoscopic internal drainage of a radiologically proven anastomotic leak afterUGI surgery in two tertiary UGI centers. The primary outcome measure was the time to removal of the DPTs after anastomotichealing. The secondary outcome measure was early oral feeding after DPT insertion. Results: Eight of the 12 patients (67%) required only one DPT, whereas four (33%) required two DPTs. The median duration of drainagewas 42 days. Two patients required surgery due to inadequate control of sepsis. Of the remaining 10 patients, nine did not require achange in DPT before anastomotic healing. Nine patients were allowed oral fluids within the 1st week and a soft diet in the 2nd week. One patient was allowed clear oral feeds on the 8th day after DPT insertion. Conclusions: Endoscopic internal drainage is becoming an established minimally invasive technique for controlling anastomotic leakafter UGI surgery. It allows for early oral nutritional feeding and minimizes discomfort from conventional external drainage.
A critical comparison of reflectometry methods for location of wiring faults
Furse, Cynthia,Chung, You Chung,Lo, Chet,Pendayala, Praveen Techno-Press 2006 Smart Structures and Systems, An International Jou Vol.2 No.1
Aging wiring in buildings, aircraft and transportation systems, consumer products, industrial machinery, etc. is among the most significant potential causes of catastrophic failure and maintenance cost in these structures. Smart wire health monitoring can therefore have a substantial impact on the overall health monitoring of the system. Reflectometry is commonly used for locating faults on wire and cables. This paper compares Time domain reflectometry (TDR), frequency domain reflectometry (FDR), mixed signal reflectometry (MSR), sequence time domain reflectometry (STDR), spread spectrum time domain reflectometry (SSTDR) and capacitance sensors in terms of their accuracy, convenience, cost, size, and ease of use. Advantages and limitations of each method are outlined and evaluated for several types of aircraft cables. The results in this paper can be extrapolated to other types of wire and cable systems.
A critical comparison of reflectometry methods for location of wiring faults
Cynthia Furse,You Chung Chung,Chet Lo,Praveen Pendayala 국제구조공학회 2006 Smart Structures and Systems, An International Jou Vol.2 No.1
Aging wiring in buildings, aircraft and transportation systems, consumer products, industrial machinery, etc. is among the most significant potential causes of catastrophic failure and maintenance cost in these structures. Smart wire health monitoring can therefore have a substantial impact on the overall health monitoring of the system. Reflectometry is commonly used for locating faults on wire and cables. This paper compares Time domain reflectometry (TDR), frequency domain reflectometry (FDR), mixed signal reflectometry (MSR), sequence time domain reflectometry (STDR), spread spectrum time domain reflectometry (SSTDR) and capacitance sensors in terms of their accuracy, convenience, cost, size, and ease of use. Advantages and limitations of each method are outlined and evaluated for several types of aircraft cables. The results in this paper can be extrapolated to other types of wire and cable systems.
Charles Huggins,Richard D. Robinson,Heidi Knowles,Heidi Knowles,Rosalia Mbugua,Jessica Laureano-Phillips,Chet D. Schrader,Nestor R. Zenarosa,Hao Wang 대한응급의학회 2019 Clinical and Experimental Emergency Medicine Vol.6 No.2
Objective A common emergency department (ED) patient care outcome metric is 72-hour ED return visits (EDRVs). Risks predictive of EDRV vary in different studies. However, risk differences associated with related versus unrelated EDRV and subsequent EDRV disposition deviations (EDRVDD) are rarely addressed. We aim to compare the potential risk patterns predictive of related and unrelated EDRV and further determine those potential risks predictive of EDRVDD.Methods We conducted a large retrospective observational study from September 1, 2015 through June 30, 2016. ED Patient demographic characteristics and clinical metrics were compared among patients of 1) related; 2) unrelated; and 3) no EDRVs. EDRVDD was defined as obvious disposition differences between initial ED visit and return visits. A multivariate multinomial logistic regression was performed to determine the independent risks predictive of EDRV and EDRVDD after adjusting for all confounders. Results A total of 63,990 patients were enrolled; 4.65% were considered related EDRV, and 1.80% were unrelated. The top risks predictive of EDRV were homeless, patient left without being seen, eloped, or left against medical advice. The top risks predictive of EDRVDD were geriatric and whether patients had primary care physicians regardless as to whether patient returns were related or unrelated to their initial ED visits. Conclusion Over 6% of patients experienced ED return visits within 72 hours. Though risks predicting such revisits were multifactorial, similar risks were identified not only for ED return visits, but also for return ED visit disposition deviations.
Kim, HyeongJun,Han, A-Reum,Cho, Chul-Hee,Kang, Hyunbum,Cho, Han-Hee,Lee, Moo Yeol,Fré,chet, Jean M. J.,Oh, Joon Hak,Kim, Bumjoon J. American ChemicalSociety 2012 Chemistry of materials Vol.24 No.1
<P>Conjugated polymers, in general, are unstable when exposedto air,solvent, or thermal treatment, and these challenges limit their practicalapplications. Therefore, it is of great importance to develop newmaterials or methodologies that can enable organic electronics withair stability, solvent resistance, and thermal stability. Herein,we have developed a simple but powerful approach to achieve solvent-resistantand thermally stable organic electronic devices with a remarkablyimproved air stability, by introducing an azide cross-linkable groupinto a conjugated polymer. To demonstrate this concept, we have synthesizedpolythiophene with azide groups attached to end of the alkyl chain(P3HT-azide). Photo-cross-linking of P3HT-azide copolymers dramaticallyimproves the solvent resistance of the active layer without disruptingthe molecular ordering and charge transport. This is the first demonstrationof solvent-resistant organic transistors. Furthermore, the bulk-heterojunctionorganic photovoltaics (BHJ OPVs) containing P3HT-azide copolymersshow an average efficiency higher than 3.3% after 40 h annealing atan elevated temperature of 150 °C, which represents one of themost thermally stable OPV devices reported to date. This enhancedstability is due to an in situ compatibilizer that forms at the P3HT/PCBMinterface and suppresses macrophase separation. Our approach pavesa way toward organic electronics with robust and stable operations.</P><P>We have demonstrated a simple and powerful approach to introducean azide cross-linkable group into conjugated polymers (P3HT-azide)for solvent-resistant and thermally stable organic electronics withremarkably improved air stability. This on-demand cross-linking mechanismenables production of a solvent-resistant hole-transporting materialfor OTFTs, as well as an in-situ compatibilizer for thermally stableOPVs.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/cmatex/2012/cmatex.2012.24.issue-1/cm203058p/production/images/medium/cm-2011-03058p_0003.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/cm203058p'>ACS Electronic Supporting Info</A></P>