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지르코니아 분말의 치밀화와 소결거동 : II. 소결거동
박홍채,김겸,김영우,이윤복,오기동,Park, H.C.,Kim, K.,Kim, Y.W.,Lee, Y.B.,Oh, K.D.,Riley, Frank L. 한국세라믹학회 1993 한국세라믹학회지 Vol.30 No.6
Sintering behaviour of zirconia powders prepared by different processing treatment was discussed. About >99% densities of theoretical were obtaiend on sintering at 140$0^{\circ}C$ for 2h in case of 300MPa uniaxially cold-pressed compact. But the lower densities were obtained on sintering above this temperature due to abnormal grain growth enabling the tetragonal to monoclinic phase transformation during cooling resulted in microcracks. All kinds of different dried powders exhibited nearly the same shrinkage behaviour with end-point shrinkage between 19 and 20%, and had maximum shrinkage rate (0.99~1.27%/min) around 120$0^{\circ}C$. During whole sintering process densification was mainly governed by grain growth and rearrangement of agglomerates. Heterogeneous abnormal grain growth and abrupt decrease in shrinkage were observed when continuous interagglomerate pore collapsed into isolated pores.
Extra-cranial Malignant Rhabdoid Tumor in Children: A Single Institute Experience
홍채리,강형진,주희영,이지원,김혜리,박성혜,김일한,박경덕,신희영 대한암학회 2015 Cancer Research and Treatment Vol.47 No.4
Purpose Malignant rhabdoid tumor (MRT) is a rare and highly aggressive tumor that affects youngchildren. Due to its extreme rarity, most of the available data are based on retrospectivecase series. To add to the current knowledge of this disease, we reviewed the patientstreated for extra-cranial MRT in our institute. Materials and MethodsA retrospective medical record review was conducted on children treated for pathologicallyconfirmed extra-cranial MRT at Seoul National University Children’s Hospital betweenJanuary 2003 and May 2013. ResultsEleven patients (7 boys, 4 girls) were diagnosed with extra-cranial MRT at a median age of9 months old. INI1 staining was important in the pathological confirmation. Six patients(55%) had renal MRT and five (45%) had soft tissue MRT. Five patients (45%) had metastasesat diagnosis. All patients underwent chemotherapy, eight patients (73%) underwentsurgery, six patients (55%) received therapeutic radiotherapy, and four patients (36%)underwent high dose chemotherapy with autologous stem cell rescue (HDCT/ASCR) withmelphalan, etoposide, and carboplatin. Five patients (45%) died of disease followingprogression (n=3) or relapse (n=2), however, there was no treatment related mortality. Theoverall survival of the cohort was 53.0% and the event-free survival was 54.5% with amedian follow-up duration of 17.8 months (range, 2.3 to 112.3 months). ConclusionExtra-cranial MRT is still a highly aggressive tumor in young children. However, the improvedsurvival of our cohort is promising and HDCT/ASCR with melphalan, etoposide, and carboplatinmay be a promising treatment option.
액상-환원법으로 합성된 Cu 분말의 특성에 미치는 분산제의 영향
김용이,김태완,박홍채,윤석영,Kim, Yong-Yee,Kim, Tea-Wan,Park, Hong-Chae,Yoon, Seog-Young 한국재료학회 2007 한국재료학회지 Vol.17 No.1
Ultra-fine Copper powder for a conductive paste in electric-electronic field have been synthesized by chemical reduction of aqueous $CuSO_4$ with hydrazine hydrate $(N_2H_4{\cdot}H_2O)$ as a reductor. The effect of reaction conditions such as dispersant and reaction temperature on the particle size and shape for the prepared Cu powders was investigated by means of XRD, SEM, TEM and TGA. Experiments showed that type of dispersant and reaction temperature were affected on the particle size and morphology of the copper powder. When the carboxymethyl cellulose (CMC) was added as a dispersant the relative mono-dispersed and spherical Cu powder was obtained. Cu powders with particle size of approximately 140nm and narrow particle size distribution were obtained from 0.3M $CuSO_4$ with adding of 0.03M CMC and 40ml $N_2H_4{\cdot}H_2O$ at a reaction temperature of $70^{\circ}C$.
최정윤,홍채리,홍경택,강형진,김성구,이재욱,장필상,정낙균,조빈,김혜리,고경남,임호준,서종진,한승민,한정우,류철주,양유진,임영탁,유건희,구홍회,국훈,전인상,조하나,신희영 대한암학회 2021 Cancer Research and Treatment Vol.53 No.4
Purpose Effectiveness and safety of clofarabine (one of the treatment mainstays in pediatric patients with relapsed/refractory acute lymphoblastic leukemia [ALL]) was assessed in Korean pediatric patients with ALL to facilitate conditional coverage with evidence development. Materials and Methods In this multicenter, prospective, observational study, patients receiving clofarabine as mono/combination therapy were followed up every 4-6 weeks for 6 months or until hematopoietic stem cell transplantation (HSCT). Response rates, survival outcomes, and adverse events were assessed. Results Sixty patients (2-26 years old; 65% B-cell ALL, received prior ≥ 2 regimen, 68.3% refractory to previous regimen) were enrolled and treated with at least one dose of clofarabine; of whom 26 (43.3%) completed 6 months of follow-up after the last dose of clofarabine. Fifty-eight patients (96.7%) received clofarabine combination therapy. Overall remission rate (complete remission [CR] or CR without platelet recovery [CRp]) was 45.0% (27/60; 95% confidence interval [CI], 32.4 to 57.6) and the overall response rate (CR, CRp, or partial remission [PR]) was 46.7% (28/60; 95% CI, 34.0 to 59.3), with 11 (18.3%), 16 (26.7%), and one (1.7%) patients achieving CR, CRp, and PR, respectively. The median time to remission was 5.1 weeks (95% CI, 4.7 to 6.1). Median duration of remission was 16.6 weeks (range, 2.0 to 167.6 weeks). Sixteen patients (26.7%) proceeded to HSCT. There were 24 deaths; 14 due to treatment-emergent adverse events. Conclusion Remission with clofarabine was observed in approximately half of the study patients who had overall expected safety profile; however, there was no favorable long-term survival outcome in this study.
뇌졸중 환자의 예비심박수를 이용한 유산소 운동의 강도 선택
김은주,김완호,송원우,양호철,김종훈,이숙희,이용석,김홍채 대한재활의학회 2009 Annals of Rehabilitation Medicine Vol.33 No.3
Objective: To determine the intensity of aerobic exercise in stroke patients using heart rate reserve (HRR) by comparing maximal oxygen consumption (VO2max) and VO2 at % HRR in maximal exercise test of treadmill, arm ergometer and bicycle ergometer. Method: Twenty nine stroke patients who could walk independently were included. Maximal exercise test using treadmill, arm ergometer and bicycle ergometer was performed. Heart rate, rating of perceived exertion, minute ventilation, oxygen consumption and respiratory exchange ratio were measured through respiratory gas analysis. When the standard criteria for maximal oxygen consumption (VO2max) was achieved, each test was terminated. We compared the measured VO2max with the VO2 at % heart rate reserve (HRR) and figured out the statistically significant % HRR point. Results: Twenty-four (82.7%), twenty-four (82.7%) and twenty-five (86.2%) patients completed maximal exercise test using treadmill, arm ergometer and bicycle ergometer. Most patients who completed maximal exercise test satisfied the VO2max criteria with VO2 plateau at the end of the exercise test (41.3∼48.2%) or RER>1.0 (79.3∼82.7%) or peak HR>age-predicted maximal heart rate (APMHR)-10 or peak HR>70% {208−(0.7×age)} when they took β- blockers (6.8∼13.7%). The differences between measured VO2max and VO2 above 60% HRR at treadmill test, 65% HRR at arm ergometer test, 65% HRR at bicycle ergometer test were not statistically significant (p>0.05). Conclusion: Exercise above 60% HRR at treadmill test, 65% HRR at arm and bicycle ergometer test can be useful as aerobic exercise intensity in stroke patients. Objective: To determine the intensity of aerobic exercise in stroke patients using heart rate reserve (HRR) by comparing maximal oxygen consumption (VO2max) and VO2 at % HRR in maximal exercise test of treadmill, arm ergometer and bicycle ergometer. Method: Twenty nine stroke patients who could walk independently were included. Maximal exercise test using treadmill, arm ergometer and bicycle ergometer was performed. Heart rate, rating of perceived exertion, minute ventilation, oxygen consumption and respiratory exchange ratio were measured through respiratory gas analysis. When the standard criteria for maximal oxygen consumption (VO2max) was achieved, each test was terminated. We compared the measured VO2max with the VO2 at % heart rate reserve (HRR) and figured out the statistically significant % HRR point. Results: Twenty-four (82.7%), twenty-four (82.7%) and twenty-five (86.2%) patients completed maximal exercise test using treadmill, arm ergometer and bicycle ergometer. Most patients who completed maximal exercise test satisfied the VO2max criteria with VO2 plateau at the end of the exercise test (41.3∼48.2%) or RER>1.0 (79.3∼82.7%) or peak HR>age-predicted maximal heart rate (APMHR)-10 or peak HR>70% {208−(0.7×age)} when they took β- blockers (6.8∼13.7%). The differences between measured VO2max and VO2 above 60% HRR at treadmill test, 65% HRR at arm ergometer test, 65% HRR at bicycle ergometer test were not statistically significant (p>0.05). Conclusion: Exercise above 60% HRR at treadmill test, 65% HRR at arm and bicycle ergometer test can be useful as aerobic exercise intensity in stroke patients.
냉 음극 형광 램프용 Y<sub>2</sub>O<sub>3</sub>:Eu<sup>3+</sup> 적색 형광체에 대한 이종 Flux 혼합첨가의 영향
구자인,김상문,신학기,박홍채,윤석영,Goo, Ja-In,Kim, Sang-Moon,Shin, Hag-Ki,Hong, Hong-Chae,Yoon, Seog-Young 한국재료학회 2009 한국재료학회지 Vol.19 No.3
$Eu^{3+}$-doped $Y_2O_3$ red phosphor was synthesized in a flux method using the chemicals $Y_2O_3,\;Eu_2O_3,\;H_3BO_3$ and $BaCl_2{\cdot}2H_2O$. The effect of a flux addition on the preparation of $Y_2O_3:Eu_{3+}$ red phosphor used as a cold cathode fluorescence lamp was investigated. $H_3BO_3$ and $BaCl_2{\cdot}2H_2O$ fluxes were used due to their different melting points. The crystallinity, thermal properties, morphology, and emission characteristics were measured using XRD, TG-DTA, SEM, and a photo-excited spectrometer. Under UV excitation of 254 nm, $Eu_2O_3$ 3.7 mol% doped $Y_2O_3$ exhibited a strong narrow-band red emission, peaking at 612 nm. From this result, the phosphor synthesized by firing $Y_2O_3$ with 3.7 mol% of $Eu_2O_3$, 0.25 mol% of $H_3BO_3$ and 0.5 mol% of $BaCl_2{\cdot}2H_2O$ fluxes at $1400^{\circ}C$ for 2 hours had a larger particle size of $4{\mu}m$ on average compared to the phosphor of the $H_3BO_3$ flux alone. In addition, a phosphor synthesized by the two fluxes together had a rounder corner shape, which led to the maximum emission intensity.