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Observation of the Nernst effect in a GeTe/NiFe structure
Ahn Jeong Ung,Jeon Jeehoon,Cho Seong Won,Lee OukJae,Lee Suyoun,Koo Hyun Cheol 한국물리학회 2023 Current Applied Physics Vol.49 No.-
On the basis of second-harmonic measurements, we separated the thermal effect from the spin–orbit torque in GeTe/NiFe bilayers. The damping-like torque and thermal effect terms are phenomenologically inseparable in the second-harmonic resistance. Several thermomagnetic effects, such as the Nernst effect and spin Seebeck effect, are also mixed in the second-harmonic signals. By exploiting the different external magnetic field dependence of these terms, we extracted the noticeable thermal-related terms. In particular, the ordinary Nernst effect is dominant over other thermal effects such as the anomalous Nernst effect and the spin Seebeck effect in a GeTe/NiFe structure. Furthermore, we have investigated the dependence of the ordinary Nernst effect on the temperature and the electric field applied to GeTe channel. These findings reveal that, in a bulk Rashba device, the thermal effect must be considered when attempting to control the spin–orbit-torque-induced switching.
현웅조(Ung-Jo Hyun),원용재(Yong-Jae Won),정응기(Eung-Gi Jeong),안억근(Eok-Keun Ahn),이정희(Jeong-Heui Lee),정국현(Kuk-Hyun Jung),박향미(Hyang-Mi Park),전용희(Yong-Hee Jeon),곽지은(Jieun Kwak),성낙식(Nak-Sig Sung),김정천(Jeong-Cheon K 한국육종학회 2021 한국육종학회지 Vol.53 No.2
Alchanmi’, a japonica rice variety, was developed from a cross between ‘Junam’ and ‘Chilbo’ by a rice breeding team at the NationalInstitute of Crop Science and Icheon, Agricultural Technology Center in 2018. The heading date of ‘Alchanmi’ was August 10 in the middleplain area-two days later than that of ‘Hwaseong’. ‘Alchanmi’ had a culm length of 69 cm, 16 cm shorter than that of ‘Hwaseong’, and 103spikelets per panicle. The viviparous germination rate of ‘Alchanmi’ was 24.4%. It showed resistance to blast, bacterial blight (K1, K2, K3race), and stripe virus, but was susceptible to the K3a race of bacterial blight, dwarf and black streak dwarf viruses, and plant hoppers. Themilled rice of this variety exhibited a translucent and medium short grain shape. The cooked rice grains of ‘Alchanmi’ had an excellent palatabilityindex (0.7) and showed lower amylose content (18.6%) than that of ‘Hwaseong’. The grain milling characteristics of ‘Alchanmi’ were betterthan those of ‘Hwaseong’, especially the head rice milling recovery ratio and head rice ratio (96.2%). ‘Alchanmi’ showed 5.83 MT/ha of milledrice productivity at 6 sites under ordinary cultivation (Registration No. 8132).
Ahn, Kye Taek,Seong, Seok-Woo,Choi, Ung Lim,Jin, Seon-Ah,Kim, Jun Hyung,Lee, Jae-Hwan,Choi, Si Wan,Jeong, Myung Ho,Chae, Shung Chull,Kim, Young Jo,Kim, Chong Jin,Kim, Hyo-Soo,Cho, Myeong-Chan,Gwon, Hy Williams & Wilkins Co 2019 Medicine Vol.98 No.11
<▼1><P>Supplemental Digital Content is available in the text</P></▼1><▼2><P><B>Abstract</B></P><P>Although the new oral P2Y<SUB>12</SUB> inhibitors, prasugrel/ticagrelor have shown greater efficacy than clopidogrel in patients with the acute coronary syndrome, but they have not shown better efficacy in Korean patients. So we evaluated the efficacy of the prasugrel/ticagrelor in patients with myocardial infarction (MI) and diabetes, a more high-risk patients group.</P><P>From the Korea Acute Myocardial Infarction Registry-National Institute of Health, 3985 patients with MI and diabetes who underwent PCI were enrolled between November 2011 and December 2015. The patients were divided into 2 groups: clopidogrel (n = 2985) and prasugrel/ticagrelor (n = 1000).</P><P>After propensity score matching, prasugrel/ticagrelor group showed a no significant difference in risk of the composite of cardiac death (CD), recurrent MI or stroke (hazard ratio [HR], 0.705; 95% confidence interval [CI], 0.474–1.048; <I>P</I> = .084). However, the risk of major bleeding was significantly higher in the prasugrel/ticagrelor group. (HR; 2.114, 95% CI; [1.027–4.353], <I>P</I> = .042). In subgroup analysis, major bleeding was significantly increased in the subgroup of creatinine clearance <60 ml/min/1.73 m<SUP>2</SUP>, hypertension, underwent a trans-femoral approach and diagnosed as NSTEMI among the prasugrel/ticagrelor group.</P><P>The use of prasugrel/ticagrelor did not improve the composite of CD, recurrent MI or stroke, however, significantly increased major bleeding events in Korean patients with MI and diabetes undergoing PCI.</P></▼2>
Brachial-ankle PWV for predicting clinical outcomes in patients with acute stroke
Ahn, Kye Taek,Jeong, Jin-Ok,Jin, Seon-Ah,Kim, Mijoo,Oh, Jin Kyung,Choi, Ung-lim,Seong, Seok-Woo,Kim, Jun Hyung,Choi, Si Wan,Jeong, Hye Seon,Song, Hee-Jung,Kim, Jei,Seong, In-Whan Informa UK (Taylor Francis) 2017 Blood pressure Vol.26 No.4
Optimization of Temperature Regime to Screen Cold Tolerant Rice Seedlings
( Ung Jo Hyun ),( Sang Min Yeo ),( Sang Bok Lee ),( Jeong Heui Lee ),( Jong Min Jeong ),( Yeaul Kyu Seong ),( Dae Ha Seo ),( Yong Jae Won ),( Eok Keun Ahn ),( Jeom Ho Lee ),( Jun Cheol Mun ),( Cheol S 한국육종학회 2016 Plant Breeding and Biotechnology Vol.4 No.2
Low temperature stress at the seedling stage of rice is an important factor causing the leaf discoloration, wilting and consequently leads to non-uniform crop maturation. In order to screen the cold tolerance elite lines efficiently, the five cold treatment conditions with different water and air temperature were designed and treated at seedling stage. For the evaluation of seedling tolerance, the injury was scored by visual rate and measured by Soil and Plant Analyzer Development (SPAD) meter. In the reactions of varieties for each treatment, the treatment ``B`` condition, 12℃ mean water with 24℃ mean air, shows clear discoloration, so it`s correlation coefficient was highest (r=-0.9, P<0.0001) among the treatments. In the treatment condition for screening the cold-tolerance elite line, the cultivar, treatment and their interaction significantly affect the SPAD value. The ``A`` treatment, 12℃ mean water with 34℃ mean air, was the best way to observe the variation between the elite lines. On the basis of the Duncan`s test for SPAD value of cultivars, Keumo (moderate tolerant), Saetbyeol (sensitive) and Seolak (tolerant) were selected as check varieties. To study its impacts at the paddy field, the changes of crop characteristics such as height, panicle length, number of tiller and heading were investigated. In later growth period, the seedling treatment impact at the paddy field leads to heading delay. Due to the low temperature stress at the seedling stage induced by 12℃ mean cold water, Japonica and Tongil group shows the heading delay 4 to 7 and 8 to 11 days respectively.