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Isometries of certain reflexive operator Algebras
Biak, Hyoung Gu 울산과학대학 1996 연구논문집 Vol.23 No.1
φ가 AlgL_(2n(n))상에서 등장사상일 때 AlgL_(2n(n))의 임의의 A에 대하여 φ(A)=U^(*)AU를 만족하는 Unitary작용소 U가 존재하거나, 혹은 φ(A)=V^(t)AV^(*)를 만족하는 Unitary작용소 V가 존재함을 밝혔다. Letφ : AlgL_(2n(n)) → AlgL_(2n(n)) be a surjective isometry. Then there exists a unitary operator U such that φ(A)=U^(*)AU or there exists a unitary operator V such that φ(A)=V^(t)AV^(*) for all A in AlgL_(2n(n)).
임상연구 : Schnider 약동학모델을 이용한 Propofol의 목표효과처농도조절주입: 성별 및 연령별 비교
태자윤 ( Ja Yoon Tae ),백희정 ( Hee Jung Biak ),김윤진 ( Youn Jin Kim ),김종학 ( Jong Hak Kim ) 대한마취과학회 2007 Korean Journal of Anesthesiology Vol.53 No.1
Background: We investigated effect-site median effective concentration (EC50) of propofol for loss of consciousness and effect-site concentration at each anesthetic stage and awakening time to compare the differences by gender or age of patients using Schnider model. Methods: Total 91 patients were allocated into 4 groups: male patients aged 18-34 year (Group 1), male patients aged 35-55 years (Group 2), female patients aged 18-34 years (Group 3) and female patients aged 35-55 years (Group 4). The effect-site EC50 for loss of consciousness was calculated and the effect-site concentration of propofol at each anesthetic stage and the awakening time of each group were recorded. Results: The effect-site EC50 of propofol for loss of consciousness was 4.53 ± 0.30μg/ml, 4.60 ± 0.25μg/ml, 4.13 ± 0.39μg/ ml and 4.47 ± 0.65μg/ml in group 1, 2, 3, and 4, respectively. The effect-site concentrations in male patients aged 18-34 years were significantly higher than those in female patients. The awakening time of female patients aged 35-55 years was shorter than that of male patients. Conclusions: There were no significant differences of effect-site EC50 for the loss of consciousness of propofol with target effect-site controlled infusion by Schnider model among the groups. However the effect-site concentrations and the awakening time of propofol by Schnider model showed differences in patients` gender and age. (Korean J Anesthesiol 2007; 53: 27~34)
풍선 확장술과 보툴리눔 독소 주입의 복합 치료로 호전된 격렬형 아칼라시아
권혁춘 ( Hyeok Choon Kwon ),이광재 ( Kwang Jae Lee ),명보현 ( Bo Heon Meong ),정재연 ( Jae Yeon Jung ),함기백 ( Ki Biak Hahm ),김진홍 ( Jin Hong Kim ),조성원 ( Sung Won Cho ) 대한소화기기능성질환·운동학회 2005 Journal of Neurogastroenterology and Motility (JNM Vol.11 No.2
Achalasia is a relatively uncommon primary motility disorder of the esophagus that is characterized by aperistalsis of the esophageal body and incomplete relaxation of the LES upon swallowing Vigorous achalasia is a subset of achalasia that show a higher contraction amplitude, minimal esophageal dilatation, prominent tertiary contractions and a higher incidence of chest pain. There is some debates over vigorous achalasia`s the response to treatment. We report here on a patient with vigorous achalasia, and the patient showed high amplitude simultaneous contractions of the esophageal body with severe chest pain and dysphagia. This patient was successfully treated by combined treatments with pneumatic balloon dilatation and botulinum toxin injection on the esophageal body and the lower esophageal sphincter. (Kor J Neurogastroenterol Motil 2005;11:161-165)
Tey, Beng Ti,Chua, Mung Ing,Chua, Ghee Sung,Ng, Michelle Yeen Tan,Biak, Dayang Radiah Awang,Tan, Wen Siang,Ling, Tau Chuan The Korean Society for Biotechnology and Bioengine 2006 Biotechnology and Bioprocess Engineering Vol.11 No.2
The influence of temperature and agitation on the growth of Escherichia coli expressing hepatitis B core antigen (HBcAg) in stirred tank bioreactor were investigated. The highest specific growth rate for E. coli$(0.844 h^{-1})$ was achieved at a temperature of $37^{\circ}C$ and an agitation speed of 250 rpm. The activation energy for the growth of the E. coli strain W3110lQ in the stirred tank bioreactor was estimated to be 11 kcal/mol. The highest protein yield was achieved at a temperature of $44^{\circ}C$ and an agitation speed of 250 rpm. The relative protein concentration at $44^{\circ}C$ is 30 and 6% higher compared to that at 30 and $37^{\circ}C$, respectively.
Beng Ti Tey,Mung Ing Chua,Ghee Sung Chua,Michelle Yeen Tan Ng,Dayang Radiah Awang Biak,Wen Siang Tan,Tau Chuan Ling 한국생물공학회 2006 Biotechnology and Bioprocess Engineering Vol.11 No.2
The influence of temperature and agitation on the growth of Escherichia coli expressing hepatitis B core antigen (HBcAg) in stirred tank bioreactor were investigated. The highest specific growth rate for E. coli (0.844 h-1) was achieved at a temperature of 37°C and an agitation speed of 250 rpm. The activation energy for the growth of the E. coli strain W3110IQ in the stirred tank bioreactor was estimated to be 11 kcal/mol. The highest protein yield was achieved at a temperature of 44°C and an agitation speed of 250 rpm. The relative protein concentration at 44°C is 30 and 6% higher compared to that at 30 and 37°C, respectively.
Saiful Hafiz Habib,Dina Kania,Robiah Yunus,Badrul Hisham Mohamad Jan,Dayang Radiah Awang Biak,Rabitah Zakaria 한국화학공학회 2021 Korean Journal of Chemical Engineering Vol.38 No.11
The interaction between methyl ester sulfonate (MES) surfactant and polyacrylamide (PAM) polymer in alkaline-surfactant-polymer (ASP) flooding due to electrostatic charges and hydrophobicity of both elements at the interface was investigated. In the ASP flooding, sodium hydroxide (NaOH) and sodium carbonate (Na2CO3) were used as alkali. At high PAM concentrations, the strong hydrophobic interaction between the PAM backbone and the carbon chain of MES destabilizes surfactant packing at the interface, increasing interfacial tension (IFT). The higher conductivity value of the ASP slug (15mS/cm) compared to the alkali-surfactant (AS) slug (7 mS/cm) indicates a strong electrostatic interaction caused by the rapid mobilization of free surfactant molecules across the PAM backbone at the water– oil interface. The lowest IFT value for ASP flooding was 0.28 mN/m. Sand pack flooding tests showed that the optimum PAM concentration in ASP flooding was 1,000 ppm, resulting in a 20-35% oil recovery. A negative effect of PAM on the oil recovery was observed at a higher PAM concentration of 9,000 ppm. IFT and mobility ratios were irregularly related to the oil recovery. At 1,000 ppm PAM, the oil recovery for ASP slug with MES and commercial surfactant sodium dodecyl sulfate (SDS) was 25% and 20%, respectively, indicating that MES is superior to SDS.
Chong, Fui Chin,Tey, Beng Ti,Dom, Zanariah Mohd,Cheong, Kok Hing,Satiawihardja, Budiatman,Ibrahim, Mohd Nordin,Rahman, Russly Abdul,Biak, Dayang Radiah Awang,Ling, Tau Chuan Korean Society for Biotechnology and Bioengineerin 2007 Biotechnology and Bioprocess Engineering Vol.12 No.3
Rice bran lipase (RBL) was delipidated to enhance its stability in organic solvent and its esterification activity at elevated temperature. The esterification activity of delipidated RBL increased as temperature was increased from 45 to $65^{\circ}C$. The esterification activity of delipidated RBL at $65^{\circ}C$ was about 14 times greater than that of the non-delipidated RBL. As temperature was further increased to $75^{\circ}C$, the non-delipidated RBL lost all esterification activity, whereas the delipidated RBL retained approximately 48% of its esterification activity. The delipidated RBL maintained a relative esterification activity greater than 80% after 16 h of incubation in hexane, whereas the non-delipidated RBL maintained a relative esterification activity of only 50%. A method for production of acylglycerol using delipidated RBL to esterify palm oil fatty acid distillate (PFAD) with glycerol in hexane was successfully developed. The effects of reaction temperatures and type of water removal agents (silica gel and molecular sieve) on the degree of esterification were also examined. A 4 h reaction at $65^{\circ}C$, catalyzed by delipidated RBL and using silica gel as the water removal agent resulted in 53.8% esterification. Thin layer chromatography analysis suggested that the esterified product was primarily comprised of mono- and di-acylglycerols.