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Observation of magnetoconductivity with terahertz probes for ferromagnetic Fe films
Huang Lin,Zhao Yunxiu,Le Thi Nguyen,Lee Sang-Hyuk,Peng Zhi,Kim Seongheun,Shin Hee Jun,Park Jaehun,Kim Hyun-Joong,Hong Jung-Il,Bang Junhyeok,Lee Hyun Seok,Kim Kyung Wan,Kim Dong-Hyun 한국물리학회 2022 Current Applied Physics Vol.41 No.-
Ultrafast characterization of spin-dependent transport behavior in ferromagnetic systems without contact probes has been of strong demand, recently. We have experimentally investigated spin-dependent complex conductivity for ferromagnetic Fe films of various thickness by means of terahertz time-domain transmission spectroscopy. Comparison of the transmitted terahertz wave amplitude and the spin-dependent conductivity reveals that the magnetization state of films effectively determines the complex conductivity. Non-invasive observation of spin-dependent conductivity by contact-free terahertz probe method is proven to be promising in further investigating spintronic materials, particularly on an ultrafast timescale.
On Antenna Orientation for Inter-Cell Interference Coordination in Cellular Network MIMO Systems
Jeng-Shin Sheu,Shin-Hong Lyu,Chuan-Yuan Huang 한국통신학회 2016 Journal of communications and networks Vol.18 No.4
Next-generation (4G) systems are designed to supportuniversal frequency reuse (UFR) to achieve best use of valuablespectra. However, it leads to undesirable interference level nearcell borders. To control this, 4G systems adopt techniques, suchas network multiple-input multiple-output (MIMO) and inter-cellinterference coordination (ICIC), to improve cell-edge throughput. Network MIMO aims at mitigating inter-cell interference towardscell-edge users (CEUs) through multi-cell cooperation, where eachcollaborative base station serves both cell-center users (CCUs) andCEUs, including other cells’ CEUs, under a power constraint. The present ICIC strategies cannot be directly applied to networkMIMO because they were designed in absence of multi-cell coordination. In the presence of network MIMO, this paper investigatesantenna orientations in ICIC and the method of power management. Results show that a proper antenna orientation can improvethe cell-edge capacity and meantime lower the interferenceto CCUs. Capacity inconsistency between CCUs and CEUs is detrimentaltomobile communications. Simulation results show that theproposed power management for ICIC in network MIMO systemscan achieve a uniform data rate regardless users’ position.
Tachi Takuji,Huang Yu-Zen,Komagata Shin,Araya Kunio,Dawood Mahadimenakbar Mohamed,Hong Pham Thai,Yang Ding,Zeegers Theo,Tschorsnig Hans-Peter,Shima Hiroshi 한국응용곤충학회 2021 Journal of Asia-Pacific Entomology Vol.24 No.1
Compsilura concinnata (Meigen) is one of the most famous, most polyphagous and most widely distributed tachinid flies (Diptera, Tachinidae) in the world. This species is well known as a biocontrol agent of some injurious pests of cultural and wild plants and has been introduced from Europe to the United States to control mainly the gypsy moth. Recently we found three new species very closely resembling C. concinnata from Southeast and East Asia: C. lobata sp. nov. (Japan and Thailand), C. malayana sp. nov. (Malaysia) and C. pauciseta sp. nov. (Japan and Taiwan). Additionally, C. samoaensis Malloch is treated as a junior synonym of C. concinnata based on the examination of the type specimen. The genetic differences in the mitochondrial COI gene data are examined to assess the accuracy of species delimitation of Compsilura. The male postabdominal characters of these species are illustrated. The piercing female postabdomen of C. concinnata is illustrated and compared to those of other members belonging to the Blondelia group including Blondelia Robineau-Desvoidy, Celatoria Coquillett, Eucelatoria Townsend and Vibrissina Rondani.
Zhang, Wei,Shin, Eun‐,Joo,Wang, Tongguang,Lee, Phil Ho,Pang, Hao,Wie, Myung‐,Bok,Kim, Won‐,Ki,Kim, Seong‐,Jin,Huang, Wen‐,Hsin,Wang, Yongjun,Zhang, Wanqin,Hong, Jauȁ Federation of American Society for Experimental Bi 2006 The FASEB Journal Vol.20 No.14
<P>We investigated the neuroprotective property of analogs of dextromethorphan (DM) in lipopolysaccharide (LPS) and 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP) models to identify neuroprotective drugs for Parkinson's disease (PD). In vivo studies showed that daily injections with DM analogs protected dopamine (DA) neurons in substantia nigra pars compacta and restored DA levels in striatum using two different models for PD. Of the five analogs studied, 3-hydroxymorphinan (3-HM), a metabolite of DM, was the most potent, and restored DA neuronal loss and DA depletion up to 90% of the controls. Behavioral studies showed an excellent correlation between potency for preventing toxin-induced decrease in motor activities and neuroprotective effects among the DM analogs studied, of which 3-HM was the most potent in attenuating behavioral damage. In vitro studies revealed two glia-dependent mechanisms for the neuroprotection by 3-HM. First, astroglia mediated the 3-HM-induced neurotrophic effect by increasing the gene expression of neurotrophic factors, which was associated with the increased acetylation of histone H3. Second, microglia participated in 3-HM-mediated neuroprotection by reducing MPTP-elicited reactive microgliosis as evidenced by the decreased production of reactive oxygen species. In summary, we show the potent neuroprotection by 3-HM in LPS and MPTP PD models investigated. With its high efficacy and low toxicity, 3-HM may be a novel therapy for PD.</P>
On Antenna Orientation for Inter-Cell Interference Coordination in Cellular Network MIMO Systems
Sheu, Jeng-Shin,Lyu, Shin-Hong,Huang, Chuan-Yuan The Korea Institute of Information and Commucation 2016 Journal of communications and networks Vol.18 No.4
Next-generation (4G) systems are designed to support universal frequency reuse (UFR) to achieve best use of valuable spectra. However, it leads to undesirable interference level near cell borders. To control this, 4G systems adopt techniques, such as network multiple-input multiple-output (MIMO) and inter-cell interference coordination (ICIC), to improve cell-edge throughput. Network MIMO aims at mitigating inter-cell interference towards cell-edge users (CEUs) through multi-cell cooperation, where each collaborative base station serves both cell-center users (CCUs) and CEUs, including other cells' CEUs, under a power constraint. The present ICIC strategies cannot be directly applied to network MIMO because they were designed in absence of multi-cell coordination. In the presence of network MIMO, this paper investigates antenna orientations in ICIC and the method of power management. Results show that a proper antenna orientation can improve the cell-edge capacity and meantime lower the interference to CCUs. Capacity inconsistency between CCUs and CEUs is detrimental to mobile communications. Simulation results show that the proposed power management for ICIC in network MIMO systems can achieve a uniform data rate regardless users' position.
Wen Yan Huang,Jeong Hoon Pan,Inhye Jeong,Seong Ju Oh,Yong Geon Hyun,Moon Seong Kim,Bok Kyung Han,Jiyoun Hong,Yong Tae Koo,Ki Won Lee,Bora Jin,Dongjin Noh,Sangho Kim,김재겸,Eui-Cheol Shin,Young Jun Kim 한국식품영양과학회 2022 Journal of medicinal food Vol.25 No.12
Fatigue is a common complaint among people under stress, causing an array of negative effects on physical function. In this study, we investigated the antifatigue and anti-inflammatory effects of Cervus elaphus L., Angelica gigas Nakai, and Astragalus membranaceus Bunge complex extracts (CAA) using a treadmill stress test in animal models. The mice were administered various doses of CAA (50–200 mg/kg bw per day) once daily for 21 days. After exhaustive treadmill exercise, the running time of CAA-treated mice increased 1.5 times; fatigue-related biochemical parameters, including lactate dehydrogenase (∼30%), creatine kinase (∼20%), and proinflammatory cytokines interleukin (IL)-1β (∼10%), and IL-6 (∼10%) in the serum and muscle tissue were downregulated compared with those in exercised control mice. This study provides strong evidence for the prevention of CAA-induced inflammatory incidences mediated by the blockade of nuclear factor-κB activation. Collectively, our results indicate that CAA can alleviate symptoms of fatigue in mice as an effective anti-inflammatory agent.
Regulatory Role of cAMP Receptor Protein over Escherichia coli Fumarase Genes
Yu-Pei Chen,Hsiao-Hsien Lin,Chi-Dung Yang,Shin-Hong Huang,Ching-Ping Tseng 한국미생물학회 2012 The journal of microbiology Vol.50 No.3
Escherichia coli expresses three fumarase genes, namely, fumA, fumB, and fumC. In the present study, catabolite repression was observed in the fumA-lacZ and fumC-lacZ fusion strains, but not in the fumB-lacZ fusion strain. The Crp-binding sites in fumA and fumC were identified using an electrophoretic mobility shift assay and footprint analysis. However, the electrophoretic mobility shift assay did not detect band shifts in fumB. Fnr and ArcA serve as transcription regulators of fumarase gene expression. In relation to this, different mutants, including Δcya, Δcrp, Δfnr, and ΔarcA, were used to explore the regulatory role of Crp over fumA and fumC. The results show that Crp is an activator of fumA and fumC gene expression under various oxygen conditions and growth rates. ArcA was identified as the dominant repressor, with the major repression occurring at 0–4% oxygen. In addition, Fnr was confirmed as a repressor of fumC for the first time. This study elucidates the effects of Crp on fumarase gene expression.
Ni Germanide Utilizing Ytterbium Interlayer for High-Performance Ge MOSFETs
Zhang, Ying-Ying,Oh, Jungwoo,Li, Shi-Guang,Jung, Soon-Yen,Park, Kee-Young,Shin, Hong-Sik,Lee, Ga-Won,Wang, Jin-Suk,Majhi, Prashant,Tseng, Hsing-Huang,Jammy, Raj,Bae, Tae-Sung,Lee, Hi-Deok The Electrochemical Society 2009 Electrochemical and solid-state letters Vol.12 No.1