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YBO<sub>3</sub>: Tb 형광체의 광특성에 대한 La<sup>3+</sup> 및 Ce<sup>3+</sup> 이온의 영향
온지원,이정백,김유혁,On, Ji-Won,Lee, Jeong-Baek,Kim, You-hyuk 한국재료학회 2003 한국재료학회지 Vol.13 No.8
In the present investigation, $La^{3+}$ and $Ce^{V}$ ions were substituted for $Y^{3+}$ in the $YBO_3$: Tb in various concentrations. It has been found that these phosphors form solid solutions within limited concentration ranges Excitation and emission spectra under 254 nm and 147 nm were investigated for these phosphors to evaluate influences of $La^{3+}$ and $Ce^{3+}$ ions on brightness and CIE color coordinates. It has been observed that brightness of $(Y, La)BO_3$: Tb under 254 nm and 147 nm when $La^{3+}$ ions are added show an increase of 2.7 times and 1.25 times, respectively. On the other hand, emission intensities of peaks in $Y_{0.8-x}$ $BO_3$: $Tb_{0.2}$ , $Ce_{x}$ show continuos decrease as $Ce^{3+}$ / content is increased from 0 to 0.4. CIE color coordinates of prepared phosphors show yellowish green which is needed to be improved to be used for display applications.
[ $LaNbO_4$ ] : X (X = Bi, Eu)형광체의 발광 및 저 전압 음극선 발광 특성
온지원,김유혁,On Ji-Won,Kim Youhyuk 한국결정성장학회 2006 한국결정성장학회지 Vol.16 No.1
희토류계 niobates인 $LaNbO_4$(Ln : Y, La, Gd)는 자체 발광형으로 $NbO^{3-}_4$ 이온의 전하 이동에 의한 넓은 띠의 청색 발광 스펙트럼을 410nm에서 나타낸다. 본 연구에서는 새로운 FED용 청색 및 적색 형광체를 개발하기 위하여 $LaNbO_4$ :X (X = Bi, Eu) 형광체를 합성하였으며, $1250^{\circ}C$에서 2시간 소성한 후 $1400^{\circ}C$에서 1시간 소성하였을 때 최대 발광피크를 얻을 수 있었다. 254nm의 여기하에서 $LaNbO_4$ : Bi는 $420\~450nm$ 영역에서 강한 청색 발광 스펙트럼을 나타내며 첨가된 $Bi^{3+}$ 이온 농도가 $1mol\%$일 때 최대 발광세기를 얻었다 $LaNbO_4$ : Eu의 경우는 첨가된 $Eu^{3+}$ 이온 농도가 $10mol\%$일 때 약 610nm에서 최대 적색 발광 스펙트럼을 나타내고 있다. $Eu^{3+}$ 이온 농도가 $10mol\%$ 이하에서는 $415\~460nm$, $530\~560nm$ 및 $570\~620nm$ 영역에서 피크가 관측되고 있다. 이들 형광체의 음극선 발광특성은 빛 발광 특성과 유사한 경향을 보였다. Rare-earth niobates, ag (Ln = Y, La, Gd) are well-known self-activated phosphors due to charge transfer in $NbO^{3-}_4$ showing a broad and strong emission band in the spectral region around 410 nm. In order to find new blue and red phosphors for FED, $LaNbO_4$ : X (X = Bi, Eu) phosphors are prepared through solid-state reactions at high temperature. The optimum reaction condition for these phosphors to give maximum emission intensity is obtained when it is first fired at $1250^{\circ}C$ for 2 h followed by second firing at $1400^{\circ}C$ for 1 h. Under irradiation at 254 nm, $1mol\%\;Bi^{3+}$ doped $LaNbO_4$ phosphor shows strong blue emission band with a range of $420\~450nm$. Also $10mol\%\;Eu^{3+}$ doped $LaNbO_4$ phosphor shows the maximum emission intensity at about 610 nm. Emission peaks at $415\~460nm$, $530\~560nm$and $570\~620nm$are observed in phosphors below $10mol\%\;Eu^{3+}$ doped $LaNbO_4$. Similar results are obtained in cathodoluminescent property of these phosphors.
Effect of aging on urodynamic parameters in women with stress urinary incontinence
신유섭,온지원,김명기 대한비뇨의학회 2015 Investigative and Clinical Urology Vol.56 No.5
Purpose: Stress urinary incontinence (SUI) is one of the most common lower urinary tract symptoms in women. We analyzed age-associated changes in urodynamic parameters in women with SUI. Materials and Methods: We analyzed the urodynamic study (UDS) results of patients with urodynamically proven SUI between March 2008 and July 2014. In uroflowmetry, maximal flow rate (Qmax), time to Qmax, voided volume, and postvoid residual urine volume (PVR) and filling cystometry data including first, strong desire to void and Valsalva leak point pressure (VLPP) were measured. Also, Qmax and detrusor pressure at Qmax (Pdet@Qmax) of voiding cystometry data were analyzed. Results: The subjects included 776 patients. Among the patients, 151 were withdrawn because of incomplete UDS data or because they met the exclusion criteria. A total of 625 patients enrolled in our study. The mean age of the population was 57.3 years. The mean Qmax, voided volume, voiding time, and PVR were 26.2 mL/s, 292.1 mL, 25.7 s, and 31.7 mL, respectively. Qmax (p=0.001) in uroflowmetry, PVR (p=0.042), first desire to void (p=0.042), Pdet@Qmax (p=0.016), and the bladder contractility index (p=0.046) were significantly different between the age groups. Qmax and Pdet@Qmax were decreased and PVR was increased significantly with age after 60 years. Conclusions: Older women with SUI also have worsened voiding function with age as the results of urodynamic parameters. Specifically, detrusor contractility decreased with age after 60 years.
임예지,온정훈,정주,류지원,김선욱,조재호,박희선,김혜원,이종찬,김은선,김낙현,조유환,장학철 대한내분비학회 2022 Endocrinology and metabolism Vol.37 No.3
Background: No consensus exists regarding the early use of subcutaneous (SC) basal insulin facilitating the transition from continuous intravenous insulin infusion (CIII) to multiple SC insulin injections in patients with severe hyperglycemia other than diabetic ketoacidosis. This study evaluated the effect of early co-administration of SC basal insulin with CIII on glucose control in patients withsevere hyperglycemia. Methods: Patients who received CIII for the management of severe hyperglycemia were divided into two groups: the early basal insulin group (n=86) if they received the first SC basal insulin 0.25 U/kg body weight within 24 hours of CIII initiation and ≥4 hoursbefore discontinuation, and the delayed basal insulin group (n=79) if they were not classified as the early basal insulin group. Rebound hyperglycemia was defined as blood glucose level of >250 mg/dL in 24 hours following CIII discontinuation. Propensityscore matching (PSM) methods were additionally employed for adjusting the confounding factors (n=108). Results: The rebound hyperglycemia incidence was significantly lower in the early basal insulin group than in the delayed basal insulin group (54.7% vs. 86.1%), despite using PSM methods (51.9%, 85.2%). The length of hospital stay was shorter in the early basal insulin group than in the delayed basal insulin group (8.5 days vs. 9.6 days, P=0.027). The hypoglycemia incidence did not differbetween the groups. Conclusion: Early co-administration of basal insulin with CIII prevents rebound hyperglycemia and shorten hospital stay withoutincreasing the hypoglycemic events in patients with severe hyperglycemia.
김낙현,김은선,온정훈,임예지,이종찬,김혜원,김선욱,류지원,박희선,조재호,오종진,변석수,장학철 연세대학교의과대학 2023 Yonsei medical journal Vol.64 No.9
Purpose: This study aimed to evaluate the use of active surgical co-management (SCM) by medical hospitalists for urology inpa tient care. Materials and Methods: Since March 2019, a hospitalist-SCM program was implemented at a tertiary-care medical center, and a retrospective cohort study was conducted among co-managed urology inpatients. We assessed the clinical outcomes of urology inpatients who received SCM and compared passive SCM (co-management of patients by hospitalists only on request; March 2019 to June 2020) with active SCM (co-management of patients based on active screening by hospitalists; July 2020 to October 2021). We also evaluated the perceptions of patients who received SCM toward inpatient care quality, safety, and subjective satis faction with inpatient care at discharge or when transferred to other wards. Results: We assessed 525 patients. Compared with the passive SCM group (n=205), patients in the active SCM group (n=320) re quired co-management for a significantly shorter duration (p=0.012) and tended to have a shorter length of stay at the urology ward (p=0.062) and less frequent unplanned readmissions within 30 days of discharge (p=0.095) while triggering significantly fewer events of rapid response team activation (p=0.002). No differences were found in the proportion of patients transferred to the intensive care unit, in-hospital mortality rates, or inpatient care questionnaire scores. Conclusion: Active surveillance and co-management of urology inpatients by medical hospitalists can improve the quality and efficacy of inpatient care without compromising subjective inpatient satisfaction.
세 가지 구강간호방법에 따른 수술 후 환자의 갈증정도 및 구강상태 비교
김미영(Mi Young Kim),두미정(Mee Jung Doo),강수경(Su Kyeong Kang),임연호(Yean Ho Lim),김현미(Hyun Mi Kim),김미경(Mi Kyoung Kim),온지원(Ji Won On),설혜선(Hye Seon Seol),강정희(Jeong Hee Kang) 한국간호교육학회 2012 한국간호교육학회지 Vol.18 No.3
Purpose: This study compared the effects of three oral care methods on thirst and oral status in patients after general anesthesia surgery. Methods: Sixty five surgical patients were prospectively randomized into three groups. Each group received one of three oral care methods: wet water gauze, frozen water gauze, or frozen normal saline gauze. The outcomes of thirst and oral status were assessed three times by trained investigators blinded to the oral care methods. Assessment times were right after a participant’s arrival to his/her room, and at 30 and 60 minutes after the pre-test. Results: The levels of thirst and oral status were significantly improved as time passed in all three oral care methods. While the level of thirst was not significantly different between the three groups, the level of oral status was significantly better with wet water gauze than frozen gauze groups, soaked in either water or normal saline. Conclusion: We recommend nurses choose one of three oral care methods based on patients’ preferences since all three oral care methods showed similar effects in improving postoperative patients’ levels of thirst and oral status.