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Entanglement Changes under Various Spin-Environment Models
최태승,이혁재 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.4
We have studied the effects of various environments on the degree of entanglement of a two- qubit system with no direct interaction. The interaction between the system and the environment is considered as a two-spin interaction. We have focused on the case in which each system qubit interacts with different environment qubits so that indirect interactions are not involved. The results show that the two-qubit system with no initial entanglement that has no direct interaction can be entangled only under interactions with entangled elements in a common bath. This implies that an entanglement of the environment can be transferred to an entanglement of a two-qubit system that has no direct and indirect interactions.
최태승 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.66 No.6
A relativistic spin operator is the difference between the total and the orbital angular momentum. As the unique position operator for a localized state, the remarkable Newton-Wigner positionoperator, which has all the desirable commutation relations of a position operator, can give a properspin operator. Historically, the three important spin operators proposed by Bogolubov et al., Pryce,and Foldy-Woutheysen, respectively were investigated to manifest a spin operator corresponding tothe Newton-Wigner position operator. We clarify a unique spin operator in relativistic quantummechanics, which can be described by using the Dirac Hamiltonian.
Relativistic Spin Operator and Lorentz Transformation of the Spin State of a Massive Dirac Particle
최태승,Hoppe Jens Reimar 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.8
We have shown that the covariant relativistic spin operator is equivalent to the spin operator commuting with the free Dirac Hamiltonian. This implies that the covariant relativistic spin operator is a good quantum observable. The covariant relativistic spin operator has a pure quantum contribution that does not exist in the classical covariant spin operator. Based on this equivalence, reduced spin states can be clearly defined. We have shown that depending on the relative motion of an observer, the change in the entropy of a reduced spin density matrix sweeps through the whole range.
지속적 외래 복막 투석이 당뇨성 신부전 환자의 β2-Microglobulin 에 미치는 영향
최태승(Tae Seung Choe),김선숙(Sun Sook Kim),권영주(Young Joo Kwon),조원용(Won Yong Cho),김형규(Hyoung Kyu Kim),원동준(Dong Joon Woo) 대한내과학회 1991 대한내과학회지 Vol.41 No.3
N/A To evaluate the effect of CAPD on the removal of beta-2-microglobulin (B2MG) in the patients with diabetic renal failure, serum levels and clearances of creatinine, urea, and B2MG, ultrafiltration rates, mass transfer raters of B2MG, and equilibration curves were determined in 5 diabetics and 5 nondiabetics with chronic renal failure undergoing CAPD. The study was carried out using peritoneal dialysis solutions with 1.5% dextrose for 240minutes of dwell time. The valuse of plasma were the means of 2samples taken at the start and after 240minutes. The values of peritoneal dialysis solution were determined on 3mlsamples taken at the 30minutes, 60minutes, 120minutes, and 240minutes after dialysate infusion. The authors results are as follows; 1) The serum R2MG levels were 39.4mg/1 in nondiabetic and 18.2mg/1 in diabetic renal failure groups which were significantly higher values than normal values and significantly lower values than that of hemodialyzed patients. 2) The peritoneal clearances of B2MG were 0.64 ml/ min in nondiabetic and 0.90ml/min in diabetic renal failure groups which represented 7.7% and 11.0% of dialysate flow rate in each groups. In diabetic renal failure group, patient 'age and mass transfer rate of B2MG were positively correlated with the peritoneal clearance of BRMG (r=0.25 and 0.76). 3) The equilibration curves of creatinine and urea were well fitted to their standard equilibration curves in both groups. In diabetic renal failure group, the dialysate to plasma ratios of creatinine and urea showed the linear correlation with the in-dwelling time during the 240minutes of dwell time (r=0.9964 and 0.9742) 4) The equilibration curves of B2MG showed that the D/P ratios of the diabetic group were constantly higher than those of nondiabetic group. The equilibration slopes between 120minutes and 240minutes after indwelling were significantly lower than those between the start and 120minutes after dwelling in each nondiabetic and diabetic groups. In conclusin, the standard CAPD may allow a constant B2MG removal diabetic renal failure patients by the means of diffusion and increased peritoneal vascular permeability of B2MG.
위경소,최태승,이석준,조원용,김형규,최원충 대한내과학회 1990 대한내과학회지 Vol.38 No.1
Nowadays, the incidence of heavy metal posisoning is increasing, especially in developing countries. The authours experienced and managed 6 patients highly suspected of chronic mercury poisoing. These patients were workers in a small electric lamp company, ballooning the lamps by mouth. They inhaled mercury vapor during their work. The authours evaluated these patients by EMG, MMPI, kidney and liver needle biopsy and measured the blood and urine mercury concentration by atomic absorption spectrophotometry. The results are as follows: 1) The mean duration of exposure to mercury was 40. 8±35.0 months and the mean duration of symptom and signs was 13.0±4.2 months. 2) The main symptoms of these patients were headache(5/6), generalized weakness(4/6) and tremor(2/6). 3) On routine laboratory evaluatioin including MMPI and EMG, we couldn't find any specific abnormal finding. 4) In liver biopsy, diffuse hepatocyte swelling and sinusoidal dilatations was found in 5 patients. In the EM finding of kidney biopsy, dark-black-round pigments of the lysosomes of the proximal tubular epithelial cells are found in 2 patients. 5) After chelation therapy, the blood mercury decreased and urinary excretion of mercury increased, esplcially in 2 patients who excrete little amounts of mercury before chelation therapy.
한국형 출혈열 환자에서 혈장 Catecholamine의 변화
정동국,최태승,김용섭,류승관,조원용,김형규,원동준 대한내과학회 1990 대한내과학회지 Vol.38 No.1
To evaluate the relationship between plasma catecholamines and the pathogenesis of acute renal failure(AFR), the plasma NE, E, Dopamine, DOPA and DOPAC were measured in 13 cases of Korean hemorrhagic fever(KHF) with renal failure and 12 normal persons as a control group by HPLC with ECD. To correlate these values with other renal functions, the blood pressure(systolic and diastolic), pulse rate, serum creatinine and creatinine clearance were measured. The results were failure as follows: 1) In 13 cases of KHF with renal failure, the plasma NE was increased in the oliguric and diuretic phases compared with the control group(p<0.05). The plasma E was also increased in the diuretic phase(p<0.05). 2) In the follow-up 7 cases, plasma E and NE were decreased in the diuretic phase(p<0.05). 3) The plasma E had a positive correlation with plasma Cr in the oliguric phase and a negative correlation with plasma Cr in the diuretic phase. The plasma NE had a positive correlation with plasma Cr in the diuretic phase. From these results, the increased synthesis of catecholamines is considered to be one of the pathogenic factors in KHF with acute renal failure. And the renal response to changes of catecholamines may be different with each phase in Korean hemorrhagic fever.
고재언,이정문,최태승,심왕근 한국환경기술학회 2022 한국환경기술학회지 Vol.23 No.2
In this study, we evaluate the separation performance of nitrate from water in a recycling batch type electrodialysis (ED) process. In particular, the influences of several operating parameters including the applied current densities and the concentrate concentrations on the ED process performance such as concentrate and dilute concentration profiles, % separation, and energy consumption, were experimentally and theoretically investigated. The two dimensional (2D) batch type ED model based on the extended Nernst-Planck transport theory was used to systematically understand the mass transfer in the ion exchange membrane and the influence of operating conditions on the separation performance. Our results show that the 2D model including the water transport across the membrane is useful to validate the separation of nitrate in different experimental conditions and the concentration behaviors in the concentrate and dilute channels. In addition, the separation performance of nitrate is substantially dependent on the applied current compared to concentrated inlet concentrations.