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J. Wannasin,D. Schwamb,J.F. Wallace 한국주조공학회 2023 한국주조공학회지 Vol.43 No.6
높은 주조 품질을 요구받고 있는 대부분의 다이캐스팅업체들은 양산공정을 통해 사용되고있는 용탕의 청정도를 평가하고 모니터링을 해야만 한다. 여러 가지 평가방법들을 사용할 수 있지만 현장에서는 일부 측정방법만이 다이캐스팅에 적용되고 있으며 목적에 맞게 적절하게 사용하여야 한다. 세 가지 가능한 평가 방법인 K-Mold, 기계적물성 평가 및 PoDFA(다공성 디스크 여과 장치) 를 대상으로 소개하고자 한다. 우선, 각 방법들은 서로 사용 목적 목적에 따라 선택될 수 있으며 K-Mold는 현장에서 빠르고 간단하게 적용할 수 있는 방법으로 일정한 규격화된 시편의 파면을 만들고 파단면 관찰을 통해 일정한 크기 이상의 산화물 갯수를 확인하여 용탕의 품질을 관리하는 편리한 평가방법 중 하나다. 기계적 물성 테스트는 용탕 청결도에 대한 정성적, 정량적 정보를 모두 확인할 수 있으며 샘플링 테스트에 적합한 시험법이라 할 수 있다. 또한, PoDFA는 용탕내에 개재물의 종류별 정밀분석과 양에 대한 상대적 비교 분석으로써 현장의 많은 경험을 통하여 데이터 축적하고 분석하는 방법으로 사용방법에 대한 전문교육이 필요하다.
D. Soundararajan,J. K. Yoon,J. S. Kwon,Y. I. Kim,김상헌,박정호,Y. J. Kim,D.-Y. Park,B. C. Kim,G. G. Wallace,고장면 대한화학회 2010 Bulletin of the Korean Chemical Society Vol.31 No.8
Closely arranged CdSe and Zn doped CdSe vertical nanorod bundles were grown directly on FTO coated glass by using electrodeposition method. Structural analysis by XRD showed the hexagonal phase without any precipitates related to Zn. FE-SEM image showed end capped vertically aligned nanorods arranged closely. From the UV-vis transmittance spectra, band gap energy was found to vary between 1.94 and 1.98 eV due to the incorporation of Zn. Solar cell parameters were obtained by assembling photoelectrochemical cells using CdSe and CdSe:Zn photoanodes, Pt cathode and polysulfide (1M Na2S + 1M S + 1M NaOH) electrolyte. The efficiency was found to increase from 0.16 to 0.22 upon Zn doping. Electrochemical impedance spectra (EIS) indicate that the charge-transfer resistance on the FTO/CdSe/polysulfide interface was greater than on FTO/CdSe:Zn/polysulfide. Cyclic voltammetry results also indicate that the FTO/CdSe:Zn/polysulfide showed higher activity towards polysulfide redox reaction than that of FTO/CdSe/polysulfide.
IN-CYLINDER FLOW ANALYSIS USING WAVELET ANALYSIS
D. PARK,P. E. SULLIVAN,J. S. WALLACE 한국자동차공학회 2006 International journal of automotive technology Vol.7 No.3
Better fundamental understanding of the interactions between the in-cylinder flows and combustion process is an important requirement for further improvement in the fuel economy and emissions of internal combustion (IC) engines. Flow near a spark plug at the time of ignition plays an important role for early flame kernel development (EFKD). Velocity data measurements in this study were made with a two-component laser Doppler velocimetry (LDV) near a spark plug in a single cylinder optical spark ignition (SI) engine with a heart-shaped combustion chamber. LDV velocity data were collected on an individual cycle basis under wide-open motored conditions with an engine speed of 1,000 rpm. This study examines and compares the flow fields as interpreted through ensemble, cyclic and discrete wavelet transformation(DWT) analysis. The energy distributions in the non-stationary engine flows are also investigated over crank angle phase and frequency through continuous wavelet transformation (CWT) for a position near a spark plug. Wavelet analysis is appropriate for analyzing the flow fields in engines because it gives information about the transient events in a time and frequency plane. The results of CWT analysis are provided and compared with the mean flows of DWT first decomposition level for all cycles at a position. Low frequency high energy found with CWT corresponds well with the peak locations of the mean velocity. The high frequency flows caused by the intake jet gradually decay as the piston approaches the bottom dead center (BDC).
Mark D. Gonzalez,Allison R. McMullen,Meghan A. Wallace,Matthew P. Crotty,David J. Ritchie,Carey-Ann D. Burnham 대한진단검사의학회 2017 Annals of Laboratory Medicine Vol.37 No.2
Dear Editor, Ceftolozane-tazobactam (C/T) and ceftazidime-avibactam (CZA) were recently approved for the treatment of complicated intra-abdominal infections and complicated urinary tract infections (http://www.fda.gov/NewsEvents/Newsroom/PressAnnouncements/ucm427534.htm, http://www.fda.gov/NewsEvents/Newsroom/PressAnnouncements/ucm435629.htm, both accessed February 24, 2016). To date, only one study has simultaneously evaluated the activities of C/T and CZA in vitro against Pseudomonas aeruginosa, and few studies have evaluated the effects of these antibiotics on multi-drug resistant (MDR) gram-negative bacteria [1-3]. This study aimed to examine the activities of C/T and CZA against β-lactam-resistant Enterobacteriaceae and P. aeruginosa clinical isolates.
Hanly, J. G.,Urowitz, M. B.,Sanchez-Guerrero, J.,Bae, S. C.,Gordon, C.,Wallace, D. J.,Isenberg, D.,Alarcó,n, G. S.,Clarke, A.,Bernatsky, S.,Merrill, J. T.,Petri, M.,Dooley, M. A.,Gladman, D.,For Wiley Subscription Services, Inc., A Wiley Company 2007 Vol.56 No.1
<B>Objective</B><P>To describe the prevalence, characteristics, attribution, and clinical significance of neuropsychiatric (NP) events in an international inception cohort of systemic lupus erythematosus (SLE) patients.</P><B>Methods</B><P>The study was conducted by the Systemic Lupus International Collaborating Clinics (SLICC). Patients were enrolled within 15 months of fulfilling the American College of Rheumatology (ACR) SLE classification criteria. All NP events within a predefined enrollment window were identified using the ACR case definitions of 19 NP syndromes. Decision rules were derived to determine the proportion of NP disease attributable to SLE. Clinical significance was determined using the Short Form 36 (SF-36) Health Survey and the SLICC/ACR Damage Index (SDI).</P><B>Results</B><P>A total of 572 patients (88% female) were recruited, with a mean ± SD age of 35 ± 14 years. The mean ± SD disease duration was 5.2 ± 4.2 months. Within the enrollment window, 158 of 572 patients (28%) had at least 1 NP event. In total, there were 242 NP events that encompassed 15 of 19 NP syndromes. The proportion of NP events attributed to SLE varied from 19% to 38% using alternate attribution models and occurred in 6.1–11.7% of patients. Those with NP events, regardless of attribution, had lower scores on the SF-36 and higher SDI scores compared with patients with no NP events.</P><B>Conclusion</B><P>Twenty-eight percent of SLE patients experienced at least 1 NP event around the time of diagnosis of SLE, of which only a minority were attributed to SLE. Regardless of attribution, the occurrence of NP events was associated with reduced quality of life and increased organ damage.</P>
IN-CYLINDER FLOW ANALYSIS USING WAVELET ANALYSIS
Park, D.,Sullivan, P.E.,Wallace, J.S. The Korean Society of Automotive Engineers 2006 International journal of automotive technology Vol.7 No.3
Better fundamental understanding of the interactions between the in-cylinder flows and combustion process is an important requirement for further improvement in the fuel economy and emissions of internal combustion(IC) engines. Flow near a spark plug at the time of ignition plays an important role for early flame kernel development(EFKD). Velocity data measurements in this study were made with a two-component laser Doppler velocimetry(LDV) near a spark plug in a single cylinder optical spark ignition(SI) engine with a heart-shaped combustion chamber. LDV velocity data were collected on an individual cycle basis under wide-open motored conditions with an engine speed of 1,000rpm. This study examines and compares the flow fields as interpreted through ensemble, cyclic and discrete wavelet transformation(DWT) analysis. The energy distributions in the non-stationary engine flows are also investigated over crank angle phase and frequency through continuous wavelet transformation(CWT) for a position near a spark plug. Wavelet analysis is appropriate for analyzing the flow fields in engines because it gives information about the transient events in a time and frequency plane. The results of CWT analysis are provided and compared with the mean flows of DWT first decomposition level for all cycles at a position. Low frequency high energy found with CWT corresponds well with the peak locations of the mean velocity. The high frequency flows caused by the intake jet gradually decay as the piston approaches the bottom dead center(BDC).
Soundararajan, D.,Yoon, J.K.,Kwon, J.S.,Kim, Y.I.,Kim, S.H.,Park, J.H.,Kim, Y.J.,Park, D.Y.,Kim, B.C.,Wallac, G.G.,Ko, J.M. Korean Chemical Society 2010 Bulletin of the Korean Chemical Society Vol.31 No.8
Closely arranged CdSe and Zn doped CdSe vertical nanorod bundles were grown directly on FTO coated glass by using electrodeposition method. Structural analysis by XRD showed the hexagonal phase without any precipitates related to Zn. FE-SEM image showed end capped vertically aligned nanorods arranged closely. From the UV-vis transmittance spectra, band gap energy was found to vary between 1.94 and 1.98 eV due to the incorporation of Zn. Solar cell parameters were obtained by assembling photoelectrochemical cells using CdSe and CdSe:Zn photoanodes, Pt cathode and polysulfide (1M $Na_2S$ + 1M S + 1M NaOH) electrolyte. The efficiency was found to increase from 0.16 to 0.22 upon Zn doping. Electrochemical impedance spectra (EIS) indicate that the charge-transfer resistance on the FTO/CdSe/polysulfide interface was greater than on FTO/CdSe:Zn/polysulfide. Cyclic voltammetry results also indicate that the FTO/CdSe:Zn/polysulfide showed higher activity towards polysulfide redox reaction than that of FTO/CdSe/polysulfide.