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Linda Samek,Younghee M. Kim,Jay Casbon,Micki M. Caskey,William L. Greene,P. Maureen Musser 한국교육개발원 2010 KEDI Journal of Educational Policy Vol.7 No.2
This qualitative study followed a survey study that investigated university faculty, classroom teachers, and principals’ perceptions of well-prepared middle school teachers in the state of Oregon in the United States. A qualitative approach allowed the researchers to explore and interpret the participants’ views (Denzin &Lincoln, 1998). In spite of many similarities, a number of differences in emphasis or priority were found among the groups, including views on assessment, curriculum development, and the importance of family and community connections for beginning classroom teachers. This study provides a foundation for deeper analysis and discussion among university faculty and practitioners concerning the "what" of middle school teacher preparation programs.
The reflective trio: A model for collaborative self-study in teacher education
William L. Greene,Younghee M. Kim,Joan L. Marioni 한국교육개발원 2007 KEDI Journal of Educational Policy Vol.4 No.1
This study examines how participation in a faculty reflection group over a two-year period affected members’ views of their teaching and the learning of their students. Three questions provide the basis for data collection and analysis: 1) How does collegial support and coaching promote open discussion of our own teaching and learning? 2) What particular cognitive and emotional needs do we have as teacher educators? 3) And are we modeling the constructivist philosophy of our program for our students? Through a series of scheduled and unscheduled meetings and teaching observations, data sources include audiotape recordings, field notes, and personal-journal reflections. In their findings, the authors share what they learned, discuss personal goals that surfaced through their collaboration, and identify strategies to help them meet these goals. Characteristics of the reflective-trio model are explicated for possible use and adaptation by others and may be of particular interest to new faculty or beginning teachers at any level.
Lee, Byoungchun,Ahn, Younghee,Kang, Sung-Myung,Park, Youngjin,Jeon, You-Jin,Rho, Jong M.,Kim, Sung-Woo The American Society for Cell Biology 2015 Molecular biology of the cell Vol.26 No.12
<P>Deregulation of mitochondrial heat-shock protein 40 (mtHsp40) and dysfunction of mtHsp70 are associated with mitochondrial fragmentation, suggesting that mtHsp40 and mtHsp70 may play roles in modulating mitochondrial morphology. However, the mechanism of mitochondrial fragmentation induced by mtHsp40 deregulation and mtHsp70 dysfunction remains unclear. In addition, the functional link between mitochondrial morphology change upon deregulated mtHsp40/mtHsp70 and mitochondrial function has been unexplored. Our coimmunoprecipitation and protein aggregation analysis showed that both overexpression and depletion of mtHsp40 accumulated aggregated proteins in fragmented mitochondria. Moreover, mtHsp70 loss and expression of a mtHsp70 mutant lacking the client-binding domain caused mitochondrial fragmentation. Together the data suggest that the molecular ratio of mtHsp40 to mtHsp70 is important for their chaperone function and mitochondrial morphology. Whereas mitochondrial translocation of Drp1 was not altered, optic atrophy 1 (Opa1) short isoform accumulated in fragmented mitochondria, suggesting that mitochondrial fragmentation in this study results from aberration of mitochondrial inner membrane fusion. Finally, we found that fragmented mitochondria were defective in cristae development, OXPHOS, and ATP production. Taken together, our data suggest that impaired stoichiometry between mtHsp40 and mtHsp70 promotes Opa1<SUB>L</SUB> cleavage, leading to cristae opening, decreased OXPHOS, and triggering of mitochondrial fragmentation after reduction in their chaperone function.</P>
Beltran, Arnel B.,Nisola, Grace M.,Choi, Shin Sik,Kim, Younghee,Chung, Wook‐,Jin John Wiley Sons, Ltd 2013 Journal of chemical technology and biotechnology Vol.88 No.12
<P><B>Abstract</B></P><P><B>BACKGROUND</B></P><P><B>Hybrid materials are being developed with improved separation properties as pervaporation (PV) membranes. Mixed matrix membranes (MMMs) containing surface‐functionalized fumed silica (SiO<SUB>2</SUB>) nanoparticles in polydimethylsiloxane (PDMS) were investigated for PV recovery of 1‐butanol. The MMMs were characterized through water contact angle, pure 1‐butanol sorption, degree of swelling and 1‐butanol partition coefficients</B>.</P><P><B>Results</B></P><P><B>Most MMMs outperformed pure PDMS for the PV of 1.5% (w/v) 1‐butanol at ≤40°C. Functionalized SiO<SUB>2</SUB> fillers enhanced the affinity of 1‐butanol to the MMMs (K<SUB>BuOH</SUB><SUP>G</SUP>) which consequently improved 1‐butanol permeability more than that of water. Thus the MMMs exhibited better separation efficiencies, but those with octyl‐functionalized (Si‐DMOS) and phenyl‐functionalized SiO<SUB>2</SUB> (Si‐DMPS) exhibited the best PV performance. Filler loading of 10 wt% Si‐DMOS and Si‐DMPS were found optimal for the PV performance of both MMMs. With temperature, component fluxes of both MMMs increased whereas permeability decreased. Based on PV separation index, both MMMs performed better than PDMS at ≤60°C, Si‐DMPS/PDMS MMM outperformed PDMS even at 70 °C</B>.</P><P><B>CONCLUSION</B></P><P><B>Improved performance of PV membranes was achieved when nonporous functionalized SiO<SUB>2</SUB> nanoparticles, especially when Si‐DMPS is used as the filler. The MMMs developed may also be useful for organic compounds recovery from dilute aqueous solutions. © 2013 Society of Chemical Industry</B></P>
Mitigating irreversible capacity losses from carbon agents via surface modification
Molina Piper, Daniela,Son, Seoung-Bum,Travis, Jonathan J.,Lee, Younghee,Han, Sang Sub,Kim, Seul Cham,Oh, Kyu Hwan,George, Steven M.,Lee, Se-Hee,Ban, Chunmei Elsevier 2015 Journal of Power Sources Vol.275 No.-
<P><B>Abstract</B></P> <P>Greatly improved cycling performance has been demonstrated with conformally coated lithium-ion electrodes by atomic layer deposition (ALD) and molecular layer deposition (MLD) techniques. This paper reports the impact of coating on the electrode additives towards mitigating undesired parasitic reactions during cycling. The ALD and MLD coatings with conformality and atomic scale thickness control effectively stabilize the surface of the electrode components, and the current collector, resulting in the increase of coulombic efficiency throughout cycling. The organic fragment integrated into the recently developed MLD process allows the coating to possess excellent mechanical properties and enhanced ionic conductivity, which significantly reduces cell polarizations throughout cycling. This work validates the importance of ALD and MLD as surface modifiers and further demonstrates their versatility and compatibility with lithium-ion battery technology.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Synthesis of ultrathin, conformal coating with atomic/molecular layer deposition. </LI> <LI> Mitigated parasitic reactions for the electrode additives via surface modification. </LI> <LI> Integrated organic fragments in coating chemistry for flexible, conductive coatings. </LI> <LI> Demonstrated the versatility and compatibility of atomic/molecular layer deposition with lithium-ion battery technology. </LI> </UL> </P>
커패시터 커플링 노이즈를 줄인 단일 전원 CMOS 베타선 센서 회로 설계
김홍주(HongZhou Jin),차진솔(JinSol Cha),황창윤(ChangYoon Hwang),이동현(DongHyeon Lee),라자 무하마드 살만(R. M. Salman),박경환(Kyunghwan Park),김종범(Jongbum Kim),하판봉(PanBong Ha),김영희(YoungHee Kim) 한국정보전자통신기술학회 2021 한국정보전자통신기술학회논문지 Vol.14 No.4
본 논문에서는 DB하이텍 0.18㎛ CMOS 공정을 이용하여 진성난수 생성기에 사용되는 베타선 센서 회로를 설계하였다. CSA 회로는 PMOS 피드백 저항과 NMOS 피드백 저항을 선택하는 기능, 50fF과 100fF의 피드백 커패시터를 선택하는 기능을 갖는 회로를 제안하였다. 그리고 펄스 셰이퍼(pulse shaper) 회로는 비반전 증폭기를 이용한 CR-RC2 펄스 셰이퍼 회로를 사용하였다. 본 논문에서 사용한 OPAMP 회로는 이중 전원(dual power) 대신 단일 전원(single power) 사용하고 있으므로 CR 회로의 저항과 RC 회로의 커패시터의 한쪽 노드는 GND 대신 VCOM에 연결한 회로를 제안하였다. 그리고 펄스 셰이퍼의 출력신호가 단조 증가가 아닌 경우 비교기 회로의 출력 신호가 다수의 연속된 펄스가 발생하더라도 단조 다중발진기(monostable multivibrator) 회로를 사용하여 신호 왜곡이 안되도록 하였다. 또한 CSA 입력단인 VIN과 베타선 센서 출력단을 실리콘 칩의 상단과 하단에 배치하므로 PCB trace 간의 커패시터 커플링 노이즈(capacitive coupling noise)를 줄이도록 하였다. In this paper, the beta-ray sensor circuit used in the true random number generator was designed using DB HiTek"s 0.18㎛ CMOS process. The CSA circuit proposed a circuit having a function of selecting a PMOS feedback resistor and an NMOS feedback resistor, and a function of selecting a feedback capacitor of 50fF and 100fF. And for the pulse shaper circuit, a CR-RC2 pulse shaper circuit using a non-inverting amplifier was used. Since the OPAMP circuit used in this paper uses single power instead of dual power, we proposed a circuit in which the resistor of the CR circuit and one node of the capacitor of the RC circuit are connected to VCOM instead of GND. And since the output signal of the pulse shaper does not increase monotonically, even if the output signal of the comparator circuit generates multiple consecutive pulses, the monostable multivibrator circuit is used to prevent signal distortion. In addition, the CSA input terminal, VIN, and the beta-ray sensor output terminal are placed on the top and bottom of the silicon chip to reduce capacitive coupling noise between PCB traces.