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Electronic Band Structure and Photocatalytic Activity of M-Doped TiO2(M=Co and Fe)
M. G. Ha,H. G. Kim,B. H. Shon,E. D. Jeong,박혁규,J. H. Jung,이재성,M. S. Won,S. W. Bae 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.III
Cobalt- or iron-doped TiO2 nanocrystals were fabricated by the hydrothermal synthesis method. The electronic structure and optical properties of the materials were studied by using XRD, UVDRS, and the FP-LAPW (Full-Potential Linearized Augmented Plane Wave) method. The bandgap energy of Co- and Fe-doped TiO2 obtained by FP-LAPW and UV-DRS was ca. 2.6 and 2.5 eV, respectively. These doped materials absorbed visible light and exhibited photocatalytic activity for oxidative decomposition of CH3Cl to CO2 under visible light irradiation ( > 420 nm). However, only Fe-doped TiO2 showed the activity for CH3Cl degradation to CO2, probably due to its higher oxidation potential, as the FP-LAPW calculation indicated.
갑상선암의 내시경 갑상선 절제술에서 근전절제술 및 전절제술의 임상적 비교
유한모,김태원,배자성<SUP>1<,SUP>,조항주,김기환,안창혁,박우찬<SUP>2<,SUP>,이동호<SUP>3<,SUP>,김정수,Han Mo Yoo,M,D,Tae Won Kim,M,D,Ja Sung Bae,M,D,<SUP>1<,SUP>,Hang Joo Cho,M,D,Kee Hwan Kim,M,D,Chang Hyuk An,M,D,Woo Chan Park,M 대한갑상선-내분비외과학회 2009 The Koreran journal of Endocrine Surgery Vol.9 No.4
Purpose: The aim of this study was to evaluate and compare the surgical outcomes of endoscopic total and near-total thyroidectomies in patients with thyroid cancer. Methods: Between February 2000 and January 2009, among 387 patients who underwent endoscopic thyroidectomy in our hospital, we evaluated 50 patients who underwent endoscopic total or near-total thyroidectomy. Thirty- five and 15 patients underwent endoscopic total thyroidectomy and near-total thyroidectomy, respectively. We analyzed the patients' clinicopathologic characteristics and post-operative complications between the two groups. Results: The mean size of tumors was 1.08 cm (range, 0.1∼3.5 cm) and the mean operative time was 192 minutes. Forty-nine tumors were papillary cancers and 1 tumor was a follicular cancer. Two patients in the endoscopic total thyroidectomy group underwent re-operation because of bleeding. In the near-total thyroidectomy group, one patient had transient hypocalcemia and one patient had temporary recurrent laryngeal nerve palsy. In the total thyroidectomy group, nine patients had transient hypocalcemia and one patient had temporary recurrent laryngeal nerve palsy. There was no statistical difference in the post-operative complicationrates between the two groups (P=0.254 for hypocalcemia and P=0.470 for injury to the recurrent laryngeal nerve). Conclusion: Based on our experience, endoscopic total thyroidectomy is a safe and feasible alternative to endoscopic near-total thyroidectomy. (Korean J Endocrine Surg 2009; 9:201-205)
Bae, J.S.,Park, S.S.,Hong, T.E.,Kim, J.P.,Yoon, J.H.,Jeong, E.D.,Won, M.S.,Jeong, J.H. Elsevier 2009 Current Applied Physics Vol.9 No.3
GdVO<SUB>4</SUB>:Eu<SUP>3+</SUP> and Li-doped GdVO<SUB>4</SUB>:Eu<SUP>3+</SUP> phosphor powders have been studied as potential red phosphors for application to flat panel display application. GdVO<SUB>4</SUB>:Eu<SUP>3+</SUP> (the molar ratio of Eu<SUP>3+</SUP>=0.03) and corresponding Li-doped (nominal molar ratio of Li<SUP>+</SUP>=0.03) phosphors were synthesized by solid state reaction method. The influence of Li-doping on the crystallization, the surface morphology, chemical states, ion distribution and photoluminescent properties of GdVO<SUB>4</SUB>:Eu<SUP>3+</SUP> phosphor powders were investigated. This phosphor showed photoluminescent brightness and crystallization increased when Li ions were doped. The relationship between crystalline and photoluminescent properties were also studied, i.e., Li<SUP>+</SUP>-doping effectively enhanced not only the crystallization but also the photoluminescent brightness of GdVO<SUB>4</SUB>:Eu<SUP>3+</SUP> powders. Comparing to GdVO<SUB>4</SUB>:Eu<SUP>3+</SUP>, the photoluminescent brightness of Li-doped GdVO<SUB>4</SUB>:Eu<SUP>3+</SUP> powder was increased by a factor of 2.3 times.
Kim, S.S.,Cho, H.J.,Won, J.H.,Bae, J.I.,Kang, D.R.,Lee, J.D.,Shin, S.J.,Lee, K.M.,Yoo, B.M.,Kim, J.K.,Lee, J.H.,Ahn, S.J.,Park, J.H.,Cho, S.W.,Cheong, J.Y. Saunders Scientific Publications, W.B. Saunders ; 2015 Cytokine Vol.76 No.2
We investigated the association between serum interleukin (IL)-8 levels and post-transarterial chemoembolization (TACE) outcomes in patients with hepatitis B virus (HBV)-associated HCC. We enrolled 119 TACE-treated patients with HBV-associated HCC; TACE refractoriness and liver transplantation (LT)-free survival were evaluated during follow-up. Pre-TACE serum levels of various cytokines (epidermal growth factor [EGF], fibroblast growth factor 2, granulocyte-colony stimulating factor [G-CSF], interferon-γ, IL-8, IL-12, IL-17A, interferon-γ-inducible protein-10, monocyte chemotactic protein-1, tumor necrosis factor-α and vascular endothelial growth factor) were analyzed. During a mean follow-up of 24.3 (1-79) months, 91 patients (76.5%) exhibited TACE refractoriness. In multivariate analyses, multiple tumors (hazard ratio [HR], 2.37; 95% confidence interval [CI], 1.28-4.39; P=0.006), large tumor size (HR, 2.36; 95% CI, 1.38-4.03; P=0.002), and combination of alpha-fetoprotein and IL-8 levels (AFP>400ng/mL or IL-8>32pg/mL; HR, 1.72; 95% CI, 1.03-2.85; P=0.037) independently predicted overall TACE refractoriness. Higher EGF (>35pg/mL) and lower G-CSF levels (≤12.5pg/mL) were associated with early TACE refractoriness (<1year; HR, 3.47; 95% CI, 1.01-11.96; P=0.049 and HR, 6.25; 95% CI, 1.62-23.81; P=0.008, respectively). Furthermore, high IL-8 level (>32pg/mL; HR, 1.68; 95% CI, 1.09-2.59; P=0.020) was associated with poor LT-free survival. In conclusion, pretreatment serum IL-8 is a useful prognostic marker for TACE refractoriness and LT-free survival in TACE-treated patients with HBV-associated HCC.
서민성(M.S.Seo),류동균(D.K.Ryu),김이훈(L.H.Kim),김준호(J.H.Kim),원충연(C.Y.Won),배기훈(K.H.Bae) 전력전자학회 2002 전력전자학술대회 논문집 Vol.- No.-
In this paper digitally based excitation systems for the synchronous brushless generators are presented. System configuration, control functions with their structure functions are also shown<br/> The control system has two feedback loops main one based on a generator's voltage with digital controller and inner one based on excitation voltage of the exciter with analog controller<br/> Usually the generator regulation of voltage is made with transducers for the voltage measurement. This paper shows technique of measuring the voltage without harmonics affect, using Park's equation transformation.
The Prediction of Minimum Miscible Pressure for CO2 EOR using a Process Simulator
( Felicia Salim ),( Seojin Kim ),( Dadan D. S. M. Saputra ),( Wisup Bae ),( Jaihyo Lee ),( In Won Kim ) 한국화학공학회 2016 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.54 No.5
Carbon dioxide injection is a widely known method of enhanced oil recovery (EOR). It is critical for the CO2 EOR that the injected CO2 to reach a condition fully miscible with oil. To reach the miscible point, a certain level of pressure is required, which is known as minimum miscibility pressure (MMP). In this study, a MMP prediction method using a process simulator is proposed. To validate the results of the simulation, those are compared to a slim tube experiment and several empirical correlations of previous literatures. Aspen HYSYS is utilized as the process simulator to create a model of CO2/crude oil encounter. The results of the study show that the process simulator model is capable of predicting MMP and comparable to other published methods.
만성신부전증환자에서 부갑상선 절제술 시 수술 중 급속 부갑상선 호르몬 측정의 의의
김우영,손길수,배정원,구범환,이재복,Woo Young Kim,M,D,Gil Soo Son,M,D,Jeoung Won Bae,M,D,Bum Hwan Koo,M,D,and Jae Bok Lee,M,D 대한갑상선-내분비외과학회 2005 The Koreran journal of Endocrine Surgery Vol.5 No.2
Purpose: Intraoperative quick parathyroid hormone assay (PTH) was introduced in the parathyroid surgery since 1988 and the value in patients with primary hyperparathyroidism was well recognized in the literature. The purpose of this study was to evaluate the usefulness of intraoperative rapid PTH assay in patients with renal hyperparathyroidism by comparing intraoperative PTH results and the biochemical results at postoperative 6<SUP>th</SUP> month, including PTH values. Methods: Fifteen consecutive patients of renal hyperpara</SUP>thyroidism underwent total parathyroidectomy and immediate autotransplantation from November 2003 to February 2005. PTH levels were measured by PTH assay at the induction of anesthesia (baseline level) and in 20-minute intervals after excision of the last parathyroid gland. More than 50% drop of initial PTH level was considered as completeness of parathyroidectomy. Results: Twenty minutes after resection, PTH levels decreased by 83.7% in 14 patients and by 50.2% in one patient. Ten patients (67%) were cured but 5 patients (34%) showed high PTH levels after 6 months. The drop rate of intraoperative quick PTH level in cured patients was 92% at 26 minutes after parathyroidectomy and was significantly different from 73.3% of persistent or recurrent five patients (P=0.047). Preoperative PTH level, calcium level, alkaline phosphatase level and preoperative localization were not different in the cured and recurrent or persistent patients of renal hyperparathyroidism. Conclusion: The value of intraoperative quick PTH assayin patients of renal hyperparathyroidism was questionable. More than 92% drop of intraoperative PTH level at 26 minutes after parathyroidectomy could predict success in our study. (Korean J Endocrine Surg 2005;5:93-99)
부신갈색종에 의한 Ectopic ACTH Syndrome 증례 보고
홍석준,김원배<SUP>1<.SUP>,Suck Joon Hong,M.D. and Won Bae Kim,M.D.<SUP>1<.SUP> 대한갑상선-내분비외과학회 2002 The Koreran journal of Endocrine Surgery Vol.2 No.2
A 28-year old female was diagnosed preoperatively to have a pheochromocytoma producing ACTH at other hospital. However the operation was delayed due to poor general condition and abnormal liver function. She revealed severe hypercortisolism, hypokalemic metabolic alkalosis, glucose intolerance and showed rapid downhill course. She was transferred to our hospital for operation but septic complications were strarted already. She was not recovered in spite of desperate operation and died just after moribund discharge. ACTH producing pheochromocytoma is uncommon and literature review indicated high mortality rates due to improper preoperative diagnosis. Proper preoperative recognition and early surgical management is mandatory for better results. (Korean J Endocrine Surg 2002;2:116-119)