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200 GeV/핵자 유황이온과 핵건판핵의 충돌에 의해 생성된 헬륨 파쇄핵의 극한파쇄 연구
김동철,송진섭,윤천실,정성헌,박인곤,김종오,김철수,김태연,이승희,조재희,천병구,김재률,김준원,김태익,박명렬,장한일,임인택 慶尙大學校 기초과학연구소 1992 基礎科學硏究所報 Vol.8 No.-
고에너지 중이온 원자핵과 핵건판의 충돌에서, 200GeV/핵자 유황이온에 의해 생성된 파쇄 헬륨핵(Z=2)의 실험실계의 방출각 분포는 표적핵에 무관한 회귀공식. dN=exp[a+k exp(η-y_b)]d[exp(η-y_b)]로 잘 표현된다. 여기에서 의사신속도 η=-ln[tan(θ/2)]이고, y_b는 실험실계의 입사입자(^32S)의 신속도이다. 이 공식에 의한 적합에서 k=-0.057±0.008로 얻어진다. 즉, 핵건판과 고에너지 중이온의 충돌에서 파쇄 헬륨핵의 exp(η-y_b)의 분포는 "극한파쇄" 현상을 잘 설명하고 있다. The angular distribution of emission angle θ of helium (Z=2) produced in the collisions of incident particles of 200 GeV/nucleon ^32S in nuclear emulsion is well expressed by dN=exp[a+k exp(η-y_b)]d[exp(η-y_b)] where the pseudorapidity is η=-ln[tan(θ/2)], the laboratory system primary rapidity is y_b, and k=-0.057+0.008. The shape of this frequency of occurrence distributions in terms of exp(η-y_b) attests to the validity of the concept of "limiting fragmentation" for helium projectile fragments produced in the projectile fragmentation regions of heavy ion collisions in nuclear emulsion.
Park, S R,Kong, S-Y,Nam, B-H,Choi, I J,Kim, C G,Lee, J Y,Cho, S J,Kim, Y W,Ryu, K W,Lee, J H,Rhee, J,Park, Y-I,Kim, N K Nature Publishing Group 2011 The British journal of cancer Vol.104 No.7
<P><B>Background:</B></P><P>We evaluated the association between polymorphisms of cytochrome P450 2A6 (<I>CYP2A6</I>)/excision repair cross-complementation group 1 (<I>ERCC1</I>)/X-ray repair cross-complementing group 1(<I>XRCC1</I>) and treatment outcomes of metastatic gastric cancer (MGC) patients treated with S-1/cisplatin.</P><P><B>Methods:</B></P><P>Among MGC patients (<I>n</I>=108), who received S-1 (40 mg m<SUP>−2</SUP> b.i.d., days 1–14) and cisplatin (60 mg m<SUP>−2</SUP>, day 1) every 3 weeks, we analysed the wild-type allele (<I>W</I>) and variants (<I>V</I>) of <I>CYP2A6</I> (<I>*4</I>, <I>*7, *9, *10</I>), and the polymorphisms of <I>ERCC1</I> (rs11615, rs3212986) and <I>XRCC1</I> (rs25487).</P><P><B>Results:</B></P><P>Patients having fewer <I>CYP2A6</I> variants had better response rates (<I>W</I>/<I>W vs W</I>/<I>V</I> other than <I>*1/*4 vs V</I>/<I>V</I> or <I>*1/*4</I>=66.7 <I>vs</I> 58.3 <I>vs</I> 32.3% <I>P</I>=0.008), time to progression (TTP) (7.2 <I>vs</I> 6.1 <I>vs</I> 3.5 months, <I>P</I>=0.021), and overall survival (23.2 <I>vs</I> 15.4 <I>vs</I> 12.0 months, <I>P</I>=0.004). <I>ERCC1 19442C</I>><I>A</I> (rs3212986) was also associated with response rate (<I>C/C</I>, 46.7% <I>vs C/A</I>, 55.3% <I>vs A/A</I>, 87.5%) (<I>P</I>=0.048) and TTP (4.4 <I>vs</I> 7.6 <I>vs</I> 7.9 months) (<I>P</I>=0.012). Patients carrying both risk genotypes of <I>CYP2A6</I> (<I>V</I>/<I>V</I> or <I>1/*4</I>) and <I>ERCC1 19442C</I>><I>A</I> (<I>C/C</I>) <I>vs</I> those carrying none showed an adjusted odds ratio of 0.113 (<I>P</I>=0.004) for response, and adjusted hazard ratios of 3.748 (<I>P</I>=0.0001) for TTP and 2.961 (<I>P</I>=0.006) for death.</P><P><B>Conclusion:</B></P><P>Polymorphisms of <I>CYP2A6</I> and <I>ERCC1 19442C</I>><I>A</I> correlated with the efficacy of S-1/cisplatin.</P>
Y.S. Cho,Y.B. Kim,W.S. Park,C.S. Kim,T.K. Kim 한국자기학회 1995 韓國磁氣學會誌 Vol.5 No.5
The influence of Nd and B contents on the magnetic properties and structures of α-Fe based Nd-(Fe, Co)B-Mo-Cu alloys was investigated. Nd₄(Fe_(0.9)Co_(0.1))_(92-x)BxMo₃Cu₁ and Nd_x(Fe_(0.9)Co_(0.1))_(86-x)B_(10)Mo₃Cu₁ amorphous alloys prepared by rapid solidification process were crystallized to form nanocrystalline structure. The increase of B content in Nd₄(Fe_(0.9)Co_(0.1))_(92-x)BxMo₃Cu₁ nanocrystalline resulted in the change of structure of soft phase in the sequence of α-Fe → α-Fe+Fe₃B → Fe₃B. The coercivitis of the alloys were increased with increasing B content and was 263 kA/m at x=18. On the contrary, the remanence has shown an opposite trends. The increase of Nd content in Nd_x(Fe_(0.9)Co_(0.1))_(86-x)B_(10)Mo₃Cu₁ nanocrystalline containing α-Fe as main phase had no effect on the structure and improved coercivity up to 256 kA/m. However, the remanence was decreased from 1.4 T to 1.15 T according to the increase of Nd content.
Kang, B.Y.,Lee, S.S.,Song, M.S.,Cho, K.K.,Han, S.H.,Cho, B.K. Elsevier 2016 Current Applied Physics Vol.16 No.9
<P>Emergence of anomalous weak ferromagnetism in geometrically frustrated magnetic system of R1-xYxB4 (R = Tb and Dy) is quite interesting [Phys. Rev. B 91, 024414 (2015)]. In order to study the weak ferromagnetism in other compounds, the magnetic properties of R1-xYxB4 (R = Sm, Gd, and Er) were investigated. The anomalous weak ferromagnetism was also found to occur in all compounds, R1-xYxB4 (R = Sm, Gd, and Er). The weak ferromagnetism is revealed in the magnetic easy plane, (001), for R1-xYxB4 (R = Sm and Gd) and along the magnetic easy axis, [001], for R1-xYxB4 (R = Er). The magnitude of saturated magnetic moment at T = 2 K shows a strong dependence on Y-concentration, i.e., the maximum magnitude occurs at x approximate to 0.3 for all compounds. The general magnetic properties of weak ferromagnetism is quite similar to the weak ferromagnetism in R1-xYxB4 (R = Tb, Dy). Therefore, it is experimentally demonstrated that the emergence of weak ferromagnetism, induced by non-magnetic substitution in a magnetically frustrated system, is the universal feature in RB4 compounds. (C) 2016 Elsevier B.V. All rights reserved.</P>
고잔류자화 α-Fe기 Nd-Fe-B 초미세결정립 합금의 자기특성
조용수(Y. S. Cho),김윤배(Y. B. Kim),박우식(W. S. Park),김창석(C. S. Kim),김택기(T. K. Kim) 한국자기학회 1995 韓國磁氣學會誌 Vol.5 No.1
The effects of Nb and Cu additives as will as substitutional Co into Nd₄Fe_(85.5)B_(10.5) melt-spun alloy were studied aiming for finding a α-Fe based Nd-Fe-B composite alloys with high energy product. The addition of Nb and Cu to Nd₄Fe_(85.5)B_(10.5) decreased the average grain size and increased the coercivity up to 207㎄/m(2.6kOe). Furthermore, the substitution of Co for Fe in Nd₄Fe_(82)B_(10)Nd₃Cu₁ alloy resulted in the decrease of the average grain size (< 2O㎚) and improved the hard magnetic properties. The remanence, coercivity and energy product of optimally annealed Nd₄Fe_(74)Co_8B_(10)Nb₃Cu₁ alloy were 1.345, 219㎄/m(2.75kOe) and 95.5kJ/㎥ (12MGOe), respectively.
Koo, B. K.,Cho, Y. M.,Park, B. L.,Cheong, H. S.,Shin, H. D.,Jang, H. C.,Kim, S. Y.,Lee, H. K.,Park, K. S. Blackwell Publishing Ltd 2007 Diabetic medicine Vol.24 No.2
<P>Abstract</P><P>Aims </P><P>Kir6.2 is found in the pancreatic B-cell, cardiac and skeletal muscle and non-vascular smooth muscle. <I>KCNJ11</I>, encoding Kir6.2, has been shown to be associated with both Type 2 diabetes mellitus and cardiovascular disease in several populations. In this study, we investigated whether polymorphisms in <I>KCNJ11</I> are associated with Type 2 diabetes and other metabolic phenotypes in the Korean population.</P><P><B>Methods </B></P><P>We sequenced <I>KCNJ11</I> to identify common polymorphisms using 24 Korean DNA samples. Of the 14 polymorphisms found in <I>KCNJ11</I>, six common ones [genomic sequence (g.)−1709A>T, g.−1525T>C, g.67G>A (E23K), g.570C>T (A190A), g.1009A>G (I337V), and g.1388C>T] were genotyped in 761 Type 2 diabetic patients and in 630 non-diabetic subjects.</P><P><B>Results</B> </P><P>All the polymorphic loci in <I>KCNJ11</I> are in strong linkage disequilibrium in the Korean population and act as one haplotype block. g.67G>A and g.1009A>G were associated with an increased risk of Type 2 diabetes [age, sex, and body mass index (BMI)-adjusted odds ratios (OR) = 1.376 (1.085–1.745), <I>P</I> = 0.008 and 1.411 (1.111–1.791), <I>P</I> = 0.005, respectively], as was one haplotype (A-T-A-C-G-C in the order of polymorphisms as shown above) containing g.67A and g.1009G [OR = 1.359 (1.080–1.709), <I>P</I> = 0.009]. The haplotype (A-T-A-C-G-C) was also strongly associated with hypertension [OR = 1.655 (1.288–2.126), <I>P</I> < 0.001].</P><P><B>Conclusions </B></P><P>Polymorphisms in <I>KCNJ11</I> are associated with Type 2 diabetes and also with hypertension in the Korean population.</P>
Ndx(Fe0.9Co0.1)90-xB6Nb₃Cu₁(x=3, 4, 5) 초미세결정립합금의 자기특성
조용수(Y. S. Cho),김만중(M. J. Kim),천정남(Z. N. Qian),김택기(T. K. Kim),박우식(W. S. Park),김윤배(Y. B. Kim) 한국자기학회 1995 韓國磁氣學會誌 Vol.5 No.5
Magnetic properties of Nd_x(Fe_(0.9)Co_(0.1))_(90-x)B_6Nb₃Cu₁(X = 3, 4, 5) melt-spun alloys with 6 at% B content were studied aiming for finding out a new α-Fe based Nd-Fe-B nanocrystalline alloy with good hard magnetic properties. Nd_x(Fe_(0.9)Co_(0.1))_(90-x)B_6Nb₃Cu₁ melt-spun alloys prepared by RSP crystallized to nanocrystalline phase. An optimally annealed Nd₃(Fe_(0.9)Co_(0.1))_(87)B_6Nb₃Cu₁ melt-spun alloys had larger volume ratio of α-Fe (Co) than that of higher Nd content alloy and showed high remanence of about 1.6 T. On the contrary, the increase of Nd content in Nd_x(Fe_(0.9)Co_(0.1))_(90-x)B_6Nb₃Cu₁ alloys gave rise to gradual increase of an amount of Nd₂(Fe, Co)₁₄B phase and improved coercivity. An optimally annealed Nd_5(Fe_(0.9)Co_(0.1))_(85)B_6Nb₃Cu₁ alloy showed the most improved hard magnetic properties. The remanence, coercivity and energy product of the alloy were 1.35 T, 219 ㎄/m (2.75 kOe), and 129 kJ/㎥ (16.2 MGOe), respectively.
α-(Fe, Co)기 Nd - (Fe, Co) - B - Nb - Cu 초미세결정립합금의 자기특성에 미치는 Nd의 영향
조덕호(Duck-Ho Cho),조용수(Y. S. Cho),김택기(T. K. Kim),송민석(M. S. Song),김윤배(Y. B. Kim) 한국자기학회 1999 韓國磁氣學會誌 Vol.9 No.3
Magnetic properties and microstructure of nanocrystalline α-(Fe, Co)-based Nd-(Fe, Co)-B-Nb-Cu alloys have been investigated. Ndx(Fe_(0.9)Co_(0.1))_(90-x)B_6Nb₃Cu₁(x = 2, 3, 4, 5, 6) alloys prepared by rapid solidification process show amorphous phase except the one with x = 2. By a proper annealing, the amorphous phase in the alloy is changed to a nanocrystalline phase. It is confirmed that the nanocrystalline alloys are composed of α-(Fe, Co) and Nd₂(Fe, Co)₁₄B₁ phase. The optimally annealed Nd₃(Fe_(0.9)Co_(0.1))_(87)B_6Nb₃Cu₁ alloy shows the highest remanence of 1.55 T. The coercivity increases with the increase of Nd content. The maximum coercivity of 4.6 kOe is obtained from an optimally annealed Nd_6(Fe_(0.9)Co_(0.1))_(84)B_6Nb₃Cu₁ alloy, resulting in the maximum energy product of 10.6 MGOe.