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Kenji Kikuchi,Soo-yeon Seo,Kang-su Kim,Kyeong-tae Kim,Masayuki Kuroki 한국산업정보학회 2014 한국산업정보학회 학술대회논문집 Vol.2014 No.1
Recently a hollowed precast concrete (HPC) column system has been developed for construction of building in order to improve constructability and economy during the construction. The HPC column supports beams during construction so that local compression acts on the column. At that time, the stress distribution from the beams to the column varies if hollow size varies. After the hollow is filled with grout concrete, the column has two layers, outer and inner elements with different compressive strength each other. Therefore, hollow size affects axial capacity of column after filling the hollow. Based on the above background, this paper performed a finite element (FE) analysis with parameter of hollow size to find the stress distribution of hollowed PC column during construction as well as after construction. As an analysis result, the wider the hollow size is, the less local compress strength is during construction. Also, the axial compressive resistance of column decreased when the hollow size is wider.
Quantum interference effect in few-layered transition metal dichalcogenide
Jinwan Park,Kenji Yoshida,Sung Jin An,Kazuhiko Hirakawa,Minkyung Jung,Jungpil Seo 한국물리학회 2020 Current Applied Physics Vol.20 No.3
Van der Waals layered transition metal dichalcogenides (TMDCs), as atomically flat two-dimensional materials, have been studied extensively in both fundamental science and application fields in recent years. The reduceddimensional properties of TMDCs not only provide a route for the fabricating of efficient field effect transistors and optoelectronic devices but also suggest the possibility of the devices that utilize quantum coherency. In this work, we characterize the electron transport properties of ReS2, one of the TMDCs, at both room temperature and low temperature. Of particular note, we measured strong quantum conductance oscillations as a function of the gate voltages and source-drain voltages at reduced temperature, which is evidence of quantum coherent transport. This work unambiguously establishes ReS2 as a promising candidate for future quantum materials.
Kim Ju-Sung,Seo Sang-Gyu,Kim Sun-Hyung,Usui Kenji,Shim Le-Sung The Korean Society of Plant Biotechnology 2005 Plant molecular biology and biotechnology research Vol.7 No.3
The effects of constituent amino acids of glutathione (GSH), glutamate (Glu), cysteine (Cys) and glycine (Gly), on GSH synthesis in lettuce seedlings were examined in this study. The GSH concentration of the seedlings was increased to 5.1-fold and 1.6-fold the concentration of the control in the first leaves and roots, respectively, by simultaneous application of these constituent amino acids (Glu+Cys+Gly) at 100 mg/l to the culture solution for two days. In the first leaves and roots of these seedlings, the concentration of GSH was 180.4 and 14.6 nmole/gFW, and non-essential amino acids including Glu, Cys and Gly occupied 93.2% and 84.0% of the total free amino acids, respectively. Application of Cys greatly increased the concentration of GSH in the roots, and application of 50 mg/l Cys increased it to 26.1-fold the concentration in the control. The activity of GSH synthetase was higher in the leaves than in the roots, whereas the activity of ${\gamma}$-glutamylcysteine synthetase was higher in the roots than in the leaves.
Jang, Jun-Hyouk,Kenji, Kawakita,Hahn, Seo-Kyung,Park, Hi-Joon,Lee, Seung-Deok,Kim, Yong-Suk,Norihito, Takahashi,Toshiyuki, Shichidou,Kazunori, Itoh,Eiji, Sumiya,Eiji, Furuya,Hitoshi, Yamashita,Hiroshi The Korean AcupunctureMoxibustion Medicine Society 2006 대한침구의학회지 Vol.23 No.6
The 3rd Japan-Korea Workshop on Acupuncture and EBM was held at Kanazawa on June $16^{th}$. From Korea team, 4 papers were presented. Dr. Hahn introduced a new approach of data analysis on series of n-of-1 trials using the Bayesian statistics. It offered important information for the future n-of-1 trials. Dr. Park clearly demonstrated the significance of various sham devices proposed and stressed the importance of research questions when we choose the control intervention in RCT. Dr. Lee reported the results of survey in Korean Medical Doctors (KMD) for their point selection and techniques to the distal and local points. Dr. Kim presented the results of face to face survey on the KMD with 28 items for acupuncture treatment on the knee OA. Finally, a draft of protocol was introduced by Dr. Kim. The title was "multi-center, a randomized, single blinded, two arms, parallel-group study to compare the effectiveness and safety of 'individualized acupuncture' and 'standardized minimal acupuncture' in Korean and Japanese patients with knee osteoarthritis (Phase IV)". From Japan team, 7 speakers presented their comments and proposals on the protocol. Dr. Takahashi introduced several issues regarding n-of-1 trials and pointed out the importance of obtaining generalizability from n-of-1 trials. Dr. Shichidou pointed the importance of research design, selection of outcome measures and reduction of biases. Dr. Itoh presented the results of point selection for the knee OA based on the literature survey. Dr. Sumiya introduced several differences between KMD and Japanese acupuncturists based on the questionnaire used in KMD survey. Dr. Furuya demonstrated a result of press tack needle and its sham device on shoulder stiffness. Dr. Yamashita introduced the results of literature survey regarding adverse events occurred by acupuncture on knee OA. Dr.Tsukayama stressed the importance of responsibility of Institutional Review Board (IRB) for the conduction of clinical trials. After several issues were discussed, the need of continued meeting for final protocol development was agreed, then the workshop was closed.
Quantum Dots Formed in Three-dimensional Dirac Semimetal Cd<sub>3</sub>As<sub>2</sub> Nanowires
Jung, Minkyung,Yoshida, Kenji,Park, Kidong,Zhang, Xiao-Xiao,Yesilyurt, Can,Siu, Zhuo Bin,Jalil, Mansoor B. A.,Park, Jinwan,Park, Jeunghee,Nagaosa, Naoto,Seo, Jungpil,Hirakawa, Kazuhiko American Chemical Society 2018 NANO LETTERS Vol.18 No.3
<P>We demonstrate quantum dot (QD) formation in three-dimensional Dirac semimetal Cd<SUB>3</SUB>As<SUB>2</SUB> nanowires using two electrostatically tuned p-n junctions with a gate and magnetic fields. The linear conductance measured as a function of gate voltage under high magnetic fields is strongly suppressed at the Dirac point close to zero conductance, showing strong conductance oscillations. Remarkably, in this regime, the Cd<SUB>3</SUB>As<SUB>2</SUB> nanowire device exhibits Coulomb diamond features, indicating that a clean single QD forms in the Dirac semimetal nanowire. Our results show that a p-type QD can be formed between two n-type leads underneath metal contacts in the nanowire by applying gate voltages under strong magnetic fields. Analysis of the quantum confinement in the gapless band structure confirms that p-n junctions formed between the p-type QD and two neighboring n-type leads under high magnetic fields behave as resistive tunnel barriers due to cyclotron motion, resulting in the suppression of Klein tunneling. The p-type QD with magnetic field-induced confinement shows a single hole filling. Our results will open up a route to quantum devices such as QDs or quantum point contacts based on Dirac and Weyl semimetals.</P> [FIG OMISSION]</BR>