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Nahm, Choon-Woo,Park, Jong-Hyuk The Korean Institute of Electrical and Electronic 2011 Transactions on Electrical and Electronic Material Vol.12 No.5
The nonlinear electrical properties and degradation behavior against an impulse-current of 400 A in the ZnO-$Pr_6O_{11}$-CoO-$Cr_2O_3$-$Y_2O_3$-$Er_2O_3$ (ZPCCYE) varistors were investigated with different $Y_2O_3/Er_2O_3$ ratios. The $Y_2O_3/Er_2O_3$ mole ratio has a significant effect on nonlinear electrical properties and impulse degradation behavior of the ZPCCYE varistors. The varistors added with $Y_2O_3/Er_2O_3$ = 0.5/0.5 exhibited the best nonlinear properties with 39 in nonlinear coefficient (${\alpha}$) and the best clamp characteristics, in which the clamping voltage ratio (K) was in the range of K = 1.62-2.18 at an impulse-current of 1-50 A. The varistors added with $Y_2O_3/Er_2O_3$ = 0.25/0.5 exhibited the best electrical stability, with $%{\Delta}E_{1mA/cm^2}$=-5.6%, $%{\Delta}{\alpha}$ = 6.7%, and $%{\Delta}J_L$ = -14.6% against an impulse-current of 400 A. On the contrary, the varistors added with $Y_2O_3/Er_2O_3$ = 0.5/0.5 were destroyed applying an impulse-current of 400 A.
Nahm, Choon-Woo The Korean Ceramic Society 2014 한국세라믹학회지 Vol.51 No.6
The microstructure, nonlinear properties, and impulse clamping characteristics of Pr/Co/Cr/Al co-doped zinc oxide ceramics were investigated with various contents of $Er_2O_3$. Increasing $Er_2O_3$ content increased the density of the sintered pellets from 5.69 to $5.83g/cm^3$, and decreased the average grain size from 10.6 to $6.5{\mu}m$. With increased $Er_2O_3$ content, the breakdown field increased from 2318 to 4205 V/cm, and the nonlinear coefficient increased from 19.4 to 40.2. The clamp characteristics were improved with the increase of the content of $Er_2O_3$. The varistors doped with 2.0 mol% exhibited the best clamp characteristics, in which the clamp voltage ratio was 1.40-1.73 at 1-50 A in an impulse current.
Constructive Approximation by Gaussian neural networks
( Nahm Woo Hahm ),( Bum Il Hong ) 호남수학회 2012 호남수학학술지 Vol.34 No.3
In this paper, we discuss a constructive approximation by Gaussian neural networks. We show that it is possible to construct Gaussian neural networks with integer weights that approximate arbitrarily well for functions in Cc (Rs). We demonstrate numerical experiments to support our theoretical results.
A Theoretical Study on the Alkylation of the Ambident Enolate from a Methyl Glycinate Schiff Base
Nahm, Kee-Pyung,Lee, Seung-Min Korean Chemical Society 2012 Bulletin of the Korean Chemical Society Vol.33 No.8
The alkylation of the ambident enolates of a methyl glycinate Schiff base with ethyl chloride was studied at B3LYP and MP2 levels with $6-31+G^*$ basis set. The free (E)-enolates and (Z)-enolate are similar in energy and geometry. The transition states for the alkylation of the free (E)/(Z)-enolate with ethyl chloride have similar energy barriers of ~13 kcal/mol. However, with a lithium ion, the (E)-enolate behaves as an ambident enolate and makes a cyclic lithium-complex in bidentate pattern which is more stable by 11-23 kcal/mol than the (Z)-enolate-lithium complexes. And the TS for the alkylation of (E)-enolate-lithium complex coordinated with one methyl ether is lower in energy than those from (Z)-enolate-lithium complexes by 4.3-7.3 kcal/mol. Further solvation model (SCRF-CPCM) and reaction coordinate (IRC) were studied. This theoretical study suggests that the alkylation of ambident enolates proceeds with stable cyclic bidentate complexes in the presence of metal ion and solvent.
Nahm, J. H.,Kim, H.,Lee, H.,Cho, J. Y.,Choi, Y. R.,Yoon, Y. S.,Han, H. S.,Park, Y. N. Spring 2016 TUMOR BIOLOGY Vol.37 No.1
<P>There is accumulating evidence that hepatocellular carcinomas (HCCs) expressing 'stemness'-related markers, e.g., keratin 19 (K19) and epithelial cell adhesion molecule (EpCAM), are associated with aggressive biological behavior. In order to further investigate the molecular characteristics of this subgroup of HCCs, we examined copy number alterations of K19-positive and K19-negative HCCs and found frequent amplifications of the 4p16.3 locus containing the TACC3 gene, which has previously not been described in HCCs. We performed an immunohistochemical analysis of transforming acidic coiled-coil-containing protein 3 (TACC3) expression in HCCs in whole tissue sections and tissue microarrays and examined the clinicopathological characteristics of TACC3-overexpressing HCCs in relation to stemness-related marker (K19, EpCAM) expression, epithelial-mesenchymal transition (EMT)-related proteins, and survival. Cytoplasmic TACC3 protein expression was seen in 7/7 whole tissue sections of K19-positive HCCs, while TACC3 expression was negative or patchy in K19-negative cases. In the tissue microarray cohort, TACC3 was overexpressed in 105/188 (55.9 %) HCCs and was associated with poor differentiation (p = 0.028), major vascular invasion (p = 0.039), higher tumor stages (p = 0.015), younger age (p = 0.003), higher proliferative activity (p < 0.001), and more frequent multipolar mitoses (p < 0.001). TACC3 expression was significantly correlated with K19 (p = 0.010) and EpCAM (p < 0.001) positivity. In addition, TACC3 overexpression was associated with frequent expression of S100A4, uPAR, and ezrin (p < 0.001, all) and loss of E-cadherin expression (p = 0.014), and overall survival was significantly decreased in patients with TACC3-positive HCCs (p = 0.014). In conclusion, TACC3 overexpression was associated with clinicopathological features of aggressiveness, increased EMT-related protein expression, and poor survival, suggesting a potential role for TACC3 as a prognostic biomarker and therapeutic target in HCC.</P>
Nahm, Francis Sahn-Gun,Lee, Pyung-Bok,Kim, Tae-Hun,Kim, Yong-Chul,Lee, Chul-Joong The Korean Pain Society 2010 The Korean Journal of Pain Vol.23 No.1
Background: An independent medical examination (IME) is a critical process for awarding reparation for injury. However, conducting an IME in pain medicine is very difficult, not only because pain is a subjective symptom, but also because there are no proper objective methods to demonstrate it. This study was conducted to compare IME reports and the court decisions on the disability status of the patients. Methods: We analyzed 79 IME reports and 25 corresponding court decisions on the disability status of patients. The diagnoses, causal relationships between the patients' status and the trauma, McBride's degree of disability, the American Medical Association's impairment ratings, the estimated annual cost for future treatment, and the necessity of care-giving were compared and analyzed. Results: The diagnoses in the 79 cases were complex regional pain syndrome (CRPS) type I (58 cases), CRPS type II (7 cases), peripheral neuropathy (5 cases), myofascial pain syndrome (4 cases), herniated intervertebral disc (2 cases), and fibromyalgia (1 case). The types of accidents were road traffic accidents (50 cases), military injuries (14 cases), industrial accidents (11 cases), and others (4 cases). The IME reports and the court decisions stated considerably different McBride's degrees of disability (P = 0.014). However, there was no significant difference in the estimated cost for future treatment between the IME reports and the court decisions (P = 0.912). Conclusions: IME reports should be accurate, fair, and based on objective findings. Feedback on IMEs from the court decisions is helpful for reference use.
A HISTOLOGIC STUDY ON THE RESPONSES OF PULP IN EXPERIMENTAL TOOTH MOVEMENT OF WHITE RATS
Nahm,Dong Seok 대한치과교정학회 1970 대한치과교정학회지 Vol.1 No.1
著者는 흰쥐 27首 下顎第一大臼齒를 矯正用 고무線으로 移動시킨후, 移動의 初期에 나타나는 齒髓의 反應을 組織學的 方法으로 觀찰하는 것을 硏究目的으로 하였다. 30Gm부터 120Gm까지의 힘을, 12首는 3日間, 15首는 7日間, 各 實驗齒牙에 賦與하였다. 觀察結果는 다음과 같았다. 1. 齒髓組織의 主變化는 齒髓血管의 循環障碍와 造象牙細胞의 空胞形式으로 나타났다. 2. 適用시킨 힘의 增加에 따라서 上記 組織變化의 範圍가 擴大되었다. 3. 其外에 齒根의 象牙質과 白堊質의 部分的 吸收도 볼 수 있었다.