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Yahng, S-A,Jeon, Y-W,Yoon, J-H,Shin, S-H,Lee, S-E,Choi, Y-S,Kim, D-Y,Lee, J-H,Cho, B-S,Eom, K-S,Lee, S,Min, C-K,Kim, H-J,Lee, J-W,Lee, K-H,Min, W-S,Lee, J-H,Kim, Y-J MACMILLAN PRESS LTD 2017 BONE MARROW TRANSPLANTATION -BASINGSTOKE- Vol.52 No.4
<P>This study aimed to analyze the use of the revised International Prognostic Scoring System (IPSS-R) assessed after hypomethylating treatment (HMT) for patients with myelodysplastic syndrome (MDS) undergoing an allogeneic stem cell transplantation (SCT). Among 115 patients who received pre-SCT HMT, comparison analysis of the prognostic values between the IPSS-R at the time of HMT (IPSS-R@HMT) and at the time of SCT after HMT (IPSS-R@SCT) showed a significantly higher predictive power for overall survival (OS) of the latter. Alteration in IPSS-R risk occurred in 60%, while the patients with 'down-staged' IPSS-R@ SCT showed better OS compared with those with 'unchanged' or 'up-staged' risk. On multivariate analysis in all 201 patients, IPSS-R@ SCT, monosomal karyotype, treatment failure to pre-SCT treatment, and high hematopoietic cell transplantation-comorbidity index were independently associated with OS. Constructed using these factors, the MDS Transplantation Prognostic Scoring System (MTPSS) identified four risk groups with 4-year OS of 76.4% in low, 61.4% in intermediate-1 and 21.9% in intermediate-2 risk groups, whereas all in the high risk group died within 2 years after SCT (P<0.001). Our study emphasizes the need for further studies aiming to evaluate a transplantation prognostic model such as the MTPSS to make appropriate decisions for transplantation in MDS.</P>
Femtosecond degenerate and nondegenerate pump-probe experiments in bulk GaAs below the band gap
Yahng, J. S.,Kim, D. S.,Fatti, N.Del,Vallee, F. Optical Society of Korea 1997 Current Optics and Photonics Vol.1 No.2
We perform degenerate and nondegenerate pump-probe experiments on bulk GaAs at 100 K below the band gap. We mostly observe a negative differential transmission signal both in the degenerate and nondegenerate experiments. We interpret our signal as due to two-photon absorption. This negative signal has a different origin from the normally considered band gap renormalization for resonant excitations.
Yahng, Seung-Ah,Jang, Eun-Jung,Choi, Soo-Young,Lee, Sung-Eun,Kim, Soo-Hyun,Kim, Dong-Wook Elsevier Science Publishers 2014 INTERNATIONAL JOURNAL OF HEMATOLOGY Vol.100 No.2
<P>Beyond the conventional Sokal and Euro scores, a new prognostic risk classification, based on the European Treatment Outcome Study (EUTOS), has been developed to predict the outcome of treatment with tyrosine kinase inhibitors (TKI) in chronic myeloid leukemia (CML). In the present study, each risk score was validated by various endpoints in 206 Korean patients with early chronic-phase CML treated with up-front standard dose imatinib. In our analysis, all three scores were found to be valid. The 5-year event-free survival (EFS) was significantly discriminated using Sokal (P = 0.002), Euro (P = 0.003), and EUTOS (P = 0.029), with the worst probability by Euro high-risk (62 vs. 49 vs. 67 %) and better EFS in Sokal low-risk (89 vs. 86 vs. 82 %). Combining all scores identified 6 % of all patients having homogeneous high-risk with distinctively worse outcomes (5-year EFS of 41 %, cumulative complete cytogenetic response rate of 56 %, and cumulative major molecular response rate of 27 %), whereas the group of discordance in risk scores (60 %) had similar results to those of intermediate-risk groups of Sokal and Euro scores. Combining all risk scores for baseline risk assessment may be useful in clinical practice for identifying groups of patients who may benefit from treatment initiation with a more potent TKI among the currently available first-line TKIs.</P>
J. S. Yahng,S. C. Jeoung,D Cho,D. S. Choi,H. M. Choi,J. H. Kim,J. S. Paik 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.47 No.6
Microfluidic devices with trapezoidal and triangular cross sections and with multiple channels are fabricated with commercially available sodalime glasses by using both femtosecond laser micromachining and glass direct thermal bonding methods. The fluid dynamics of the devices are investigated as a function of the flow rate, the channel depth, and the channel’s geometry by using micro-particle image velocimetry measurements. All the observations are in good agreement with numerical calculations. The introduction of a smaller micro-channel array into the middle of a rather larger fluidic channel caused the fluid to mix, even when the fluids had very low Reynold’s number of 2 3. The numerical calculations for multi-channel devices show that the efficient mixing of the fluids in the micro channel is due to complex phenomena, such as mutual interference of fluids with different momenta and the viscosity effect of a material adjacent to the surface.
리카아도에서 마르크스까지의 價値 및 分配理論에 있어서의 문제점
梁熺錫 慶尙大學校 1982 論文集 Vol.21 No.3
In the Cambridge System of economic analysis, the distributive variables are treated as equilibrating variables. Such an analytical system originates from David Ricardo in his 'Essay on Profits.' This paper attempts at a close inquiry into the problems in the transition of Ricardo's theories of value and distribution, and into the problems in the so-called 'Transformation' Process. Ricardo, with all his literatures, published or not, tried to prove the proposition that 'it is the profits of the farmer that regulate the profits of all other trades.' To prove this proposition he made three alternative methodogical hypotheses; namely; (1) Corn Model or 'corn rate of profits'. in which the distributive variables are logically prior to the price variables, (2) Pure Labour Theory of Value, the result of an abortive attempt to construct a value system in which the antagonistic relations of dirtributive variables are directly realised without causing any compounding effects of changes in the distributive variables upon relative prices of commodities, and (3) an Invariable Measure of Value, with which the influence of changes in the relative prices of commodities(caused by changes in the distributive variables) upon the appregative relations of distribution can wholly be removed. Marx, as a post-Ricardian political economist, also attempted to construct an analytical system, in which the distributive variables are determined within value-relations only; independently of the relative prices or the prices of production which are defined up to the changes in a dirtributive variable (i.e., the rate of profits) given by value-relations. Marx however, did not fully recognised the 'Ricardian Problem' of finding an Invariable Measure of Value, in terms of which aggregative values as aggregated income and aggregate profits are invariant to the distribution of income. Then, Marx, as Ricardo did, left one of the distributive variables, i.e., the rate of profits, to be determined simultaneously with, not prior to, the price variables.