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Jason Lai,Benjamin Holden Schnapp,David Simon Tillman,Mary Westergaard,Jamie Hess,Aaron Kraut 한국보건의료인국가시험원 2020 보건의료교육평가 Vol.17 No.-
Purpose: The Accreditation Council for Graduate Medical Education (ACGME) requires all residency programs to provide increasing autonomy as residents progress through training, known as graded responsibility. However, there is little guidance on how to implement graded responsibility in practice and a paucity of literature on how it is currently implemented in emergency medicine (EM). Wesought to determine how EM residency programs apply graded responsibility across a variety of activities and to identify which considerations are important in affording additional responsibilities to trainees. Methods: We conducted a cross-sectional study of EM residency programs using a 23-question survey that was distributed by email to162 ACGME-accredited EM program directors. Seven different domains of practice were queried. Results: We received 91 responses (56.2% response rate) to the survey. Among all domains of practice except for managing critically illmedical patients, the use of graded responsibility exceeded 50% of surveyed programs. When graded responsibility was applied,post-graduate year (PGY) level was ranked an “extremely important” or “very important” consideration between 80.9% and 100.0% ofthe time. Conclusion: The majority of EM residency programs are implementing graded responsibility within most domains of practice. Whendecisions are made surrounding graded responsibility, programs still rely heavily on the time-based model of PGY level to determineadvancement.
Cascaded Dual-Buck Inverter With Reduced Number of Inductors
Institute of Electrical and Electronics Engineers 2018 IEEE transactions on power electronics Vol.33 No.4
<P>A dual-buck inverter (DBI) possesses no shoot-through worries and can boost efficiency by using power <SMALL>mosfet</SMALL> s. The main drawback of a DBI is the use of more inductors than in a traditional full-bridge inverter. This greater number of inductors decreases the power density and increases system cost. In this paper, a modified cascaded full-bridge DBI is proposed. It retains all the advantages of the conventional cascaded full-bridge DBI, possesses no shoot-through issues, and can be operated with no pulse-width-modulation dead-times. It can be implemented with power <SMALL>mosfet</SMALL> without reverse recovery issues of a body diode to boost efficiency. The cascaded modules in the proposed inverter share current limiting inductors. Therefore, the number of inductors and inductor footprints, the complexity of the circuit layout, required inductance, and magnetic volume can all be decreased. To show the advantages of the proposed inverter, detailed theoretical analysis and experimental results are provided.</P>
Enhancing Association Rule Mining with a Profit Based Approach
Ming-Lai Li,Heung-Num Kim,Jason J.Jung,Geun-Sik Jo 한국정보과학회 2005 한국정보과학회 학술발표논문집 Vol.32 No.2
With the continuous growth of e-commerce there is a huge amount of products information available online. Shop managers expect to apply information techniques to increase profit and perfect service. Hence many e-commerce systems use association rule mining to further refine their management. However previous association rule algorithms have two limitations. Firstly, they only use the number to weight item’s essentiality and ignore essentiality of item profit. Secondly, they did not consider the relationship between number and profit of item when they do mining. We address a novel algorithm, profit-based association rule algorithm that uses profit-based technique to generate 1-itemsets and the multiple minimum supports mining technique to generate N-items large itemsets.
A Transformer-Coupled, Series-Resonant Topology for the Induction Heating of Aluminum Cookware
Andrew Amrhein,Jih-Sheng (Jason) Lai 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
Induction heating of aluminum cookware is difficult due to its low resistivity and lack of ferromagnetic properties. Both of these factors result in an effective impedance reflected through the work coil that is too low for practical inverter design and makes efficient coil design difficult. This paper presents a transformer-coupled topology as a means of efficiently delivering the desired amount of power into such low-impedance induction heating loads while keeping the inverter design within practical constraints. This topology consists of a conventional series-load-resonant coil/capacitor circuit. A high-frequency transformer is then used to the couple the series-resonant load to a full-bridge inverter, removing the constraint between load impedance and inverter design. The proposed circuit is built and its operation is experimentally verified.
Design Optimization of the ZVT Soft-Switching Inverter for High Power AC Motor Drives
Soon-Kurl Kwon,Byeong-Mun Song,Jason Lai 한국정보과학회 1999 Journal of Electrical Engineering and Information Vol.4 No.4
A soft-switching inverter reduces switching stresses and switching losses, achieving high efficiency and reliability of the drive system. This paper presents design optimization of a zero-voltage-transition inverter for high power ac drives, compared with the conventional hard switching scheme. Also presented is detailed comparison of the switching characteristics of these schemes, including dv/dt, di/dt and switching losses. Designing of the soft-switching inverter for motor drive applications, it is very important to find suitable resonant circuit components for ZVT operation during turn-on and turn-off. To verify the proposed design optimization, detailed analyses with theoretical and experimental approaches have been conducted on a prototype to any extent possible.
Pyo, Jung Yoon,Kim, Dae Sik,Jung, Seung Min,Song, Jason Jungsik,Park, Yong-Beom,Lee, Sang-Won,Lai., Jenn-Haung Williams & Wilkins Co 2017 Medicine Vol.96 No.30
<▼1><P>Supplemental Digital Content is available in the text</P></▼1><▼2><P><B>Abstract</B></P><P>The most important differential diagnoses of acute monoarticular arthritis are septic arthritis and acute gout attack. Identifying infection is crucial in preventing the devastating outcome of septic arthritis. The delta neutrophil index (DNI) is a value that corresponds to the fraction of circulating immature granulocytes. As DNI reflects the burden of infection, we evaluated this index as a differentiating marker between septic arthritis and acute gout attack.</P><P>The medical records of 149 patients with septic arthritis and 194 patients with acute gout attack were reviewed. A specific cell analyzer, ADVIA 2120, was used to measure DNI. Clinical and laboratory markers associated with predicting septic arthritis were assessed by using logistic regression.</P><P>Patients with septic arthritis showed higher levels of DNI than those with acute gout attack (3.3 vs 0.6%, <I>P</I> < .001). Similar results were observed in patients without monosodium urate (MSU) crystal confirmation or those with normouricemia (3.3 vs 0.5 and 3.1 vs 0.7%, respectively; <I>P</I> < .001 for both). A DNI level of 1.9% was determined as the cutoff value for predicting septic arthritis. In the multivariate analysis, DNI was the most powerful independent value for predicting septic arthritis (odds ratio 14.003).</P><P>This study showed the possibility of using DNI as a differentiating marker between septic arthritis and acute gout attack at the crucial early phase. DNI showed its relevance regardless of confirmation of MSU crystal deposition or serum level of uric acid.</P></▼2>
Design and Efficiency Analysis 48V-12V Converter using Gate Driver Integrated GaN Module
김종완,최중묵,유세프알라브,제이슨라이,Kim, Jongwan,Choe, Jung-Muk,Alabdrabalnabi, Yousef,Lai, Jih-Sheng Jason The Korean Institute of Power Electronics 2019 전력전자학회 논문지 Vol.24 No.3
This study presents the design and experimental result of a GaN-based DC-DC converter with an integrated gate driver. The GaN device is attractive to power electronic applications due to its superior device performance. However, the switching loss of a GaN-based power converter is susceptible to the common source inductance, and converter efficiency is severely degraded with a large loop inductance. The objective of this study is to achieve high-efficiency power conversion and the highest power density using a multiphase integrated half-bridge GaN solution with minimized loop inductance. Before designing the converter, several GaN and Si devices were compared and loss analysis was conducted. Moreover, the impact of common source inductance from layout parasitic inductance was carefully investigated. Experimental test was conducted in buck mode operation at 48 -12 V, and results showed a peak efficiency of 97.8%.