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Lei Gao,Feng Li,Ye Wang,Xing Mao Xiao,Peng Da Huo 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.8
Solid-state bonding of heterogeneous materials is one of the effective ways to achieve light weight. An extrusion formingprocess for Mg/Al thickness-oriented bonding sheet was carried out. Due to triaxial compressive stress in the extrusion container,the AZ31 and AA6061 billets were deformed and the bonding and forming of Mg/Al thickness-oriented sheet can berealized by this method. The observation results of the bonding position by using XRD, SEM and EDS showed that: at theforming temperature with 360–420 °C, it had a good bonding interface, and the width of the transition layer increased withthe increase of the forming temperature. The presence of brittle intermetallic compounds in the transition layer indicated thatmetallurgical bonding had occurred at the interface. Considering all factors comprehensively, when the forming temperaturewas 390 °C, the bonding quality was appropriate. Its tensile-shear strength was 42 MPa, the width of the interface transitionlayer was about 10 μm, and the microhardness was about 164.3 HV. This method provided scientific guidance and technicalreserves for green forming of Mg/Al sheets.
( Lei Zhang ),( Ji T Gong ),( Hu Q Zhang ),( Quan H Song ),( Guang H Xu ),( Lei Cai ),( Xiao D Tang ),( Hai F Zhang ),( Fang E Liu ),( Zhan S Jia ),( Hong W Zhang ) 대한소화기기능성질환·운동학회 2015 Journal of Neurogastroenterology and Motility (JNM Vol.21 No.2
Background/Aims There are increasing evidences for gastrointestinal motility disorder (GIMD) and gastric stress ulcer induced by noise stress. The present study was to investigate the reversed effect of melatonin on GIMD and gastric stress ulcer induced by noise stress and potential mechanism. Methods Noise stress was induced on rats, and melatonin (15 mg/kg) was administered to rats by intraperitoneal injection. Differences were assessed in gastric residual rate (GRR), small intestine propulsion rate (SPR), Guth injury score, cortisol, gastrointestinal hormones (calcitonin-gene-related peptide and motilin) and oxidative stress markers (superoxide dismutase and malondialde hyde) in blood plasma as well as gastric mucosa homogenate with or without melatonin. The pathological examination of gastric mucosa was also performed. Results The GRR and SPR were improved by noise stress compared with control (P < 0.05). The pathological examination and Guth injury score revealed gastric stress ulcer. Moreover, the levels of cortisol, motilin and malondialdehyde in blood plasma and malondialdehyde in gastric mucosa homogenate were increased by noise stress (P < 0.05). CGRP and superoxide dismutase activity in both of blood plasma and gastric mucosa homogenate were significantly decreased (P< 0.05). Furthermore, melatonin reversed changes in GRR, SPR, pathological examination, Guth injury score, cortisol, motilin, CGRP, superoxide dismutase activity and malondialdehyde (P < 0.05). Conclusions Melatonin is effective in reversing the GIMD and gastric stress ulcer induced by noise stress. The underlying mechanism may be involved in oxidative stress and gastrointestinal hormones. (J Neurogastroenterol Motil 2015;21:189-199)
Xiao Lei Yin,Ning Wang,Xiao Dan Yu,Yu Hao Li,Bo Zhang,Dai Lin Li 한국광학회 2021 Current Optics and Photonics Vol.5 No.6
The theoretical analysis and optimization of extrinsic Fabry-Perot interferometer (EFPI) opticalfiber humidity sensors are deeply investigated. For a typical dual-cavity structure composed of an optical fiber and a humidity-sensitive membrane (HSM), the changes in refractive index (RI) and initial length are discussed for polymer materials and porous oxide materials when relative humidity (RH) increases. The typical interference spectrum is simulated at different RH using MATLAB. The spectral change caused by changing HSM RI and initial length are simulated simutineously, showing different influences on humidity response. To deeply investigate the influence on RH sensitivity, the typical response sensitivity curves for different HSM lengths and air-cavity lengths are simulated. The results show that the HSM is the vital factor. Short HSM length can improve the sensitivity, but for HSM RI and length the influences on sensitivity are opposite, because of the opposite spectral-shift trend. Deep discussion and an optimization method are provided to solve this problem. According to analysis, an opaque HSM is helpful to improve sensitivity. Furthermore, if using an opaque HSM, a short air cavity and long HSM length can improve the sensor’s sensitivity These results provide deep understanding and some ideas for designing and optimizing highly sensitive EFPI fiber humidity sensors.
Maximum Likelihood Receivers for DAPSK Signaling
Xiao Lei,Dong Xiaodai,Tjhung Tjeng T. The Korea Institute of Information and Commucation 2006 Journal of communications and networks Vol.8 No.2
This paper considers the maximum likelihood (ML) detection of 16-ary differential amplitude and phase shift keying (DAPSK) in Rayleigh fading channels. Based on the conditional likelihood function, two new receiver structures, namely ML symbol-by-symbol receiver and ML sequence receiver, are proposed. For the symbol-by-symbol detection, the conventional DAPSK detector is shown to be sub-optimum due to the complete separation in the phase and amplitude detection, but it results in very close performance to the ML detector provided that its circular amplitude decision thresholds are optimized. For the sequence detection, a simple Viterbi algorithm with only two states are adopted to provide an SNR gain around 1 dB on the amplitude bit detection compared with the conventional detector.
Xiao-lei Zhu,Hongwei Zhang,Jun Nie,Guiping Ma 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.45 No.-
pH-sensitive drug loaded core shellfibers were fabricated by a combination of electrospinning and UVphoto-polymerization. Combretastatin A4 (CA4) was selected as the model drug loaded in PLA to test thepH-sensitivity property of the core shellfibers. The morphology of thefibers was studied by scanningelectron microscopy (SEM), and the core shell structure of thefibers was confirmed by transmissionelectron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). The drug release assay wastested via the UV–vis spectrophotometer, and the pH-sensitivity of core shellfibers was tested by drugrelease assay under pH 5.0 and 7.4.
Corporate Social Responsibility(CSR) Corporate / Consumer-CSR Activities and Brand Attitude
Xiao-Lei Yu(유효뢰),Ju-Hua Li(이국화),Ju-Hyoung Lee(이주형) 동아인문학회 2014 동아인문학 Vol.28 No.-
본 연구는 삼성, 현대자동차, LG전자 등 중국 시장에서 기업 환경변화를 주도하고 있는 한국기업에 대한 연구와 고찰을 통해 CSR 활동과 적합성, 기업의 평판, 기업의 신뢰도, 소비자들의 태도 간의 상관관계를 분석하고 있다. 최근 기업의 사회적 책임을 중요시하는 움직임이 갈수록 활발해지고 있으며, 특히 해외에서의 CRS 활동은 더욱 강조되고 있는 추세다. 하지만 여전히 이에 대한 깊이 있는 연구 성과는 아직 미흡한 것이 현실이다. 본 연구는 필드 샘플링, 네트워크 샘플링, 단계별 샘플링 추출, 설문지조사 등 다양한 방법들을 결합시켜 연구를 진행하였다. 필드 샘플링은 주로 한국의 경상도 지역과 중국의 창사(長沙), 선양(沈陽) 등의 지역에서 이루어졌으며, 네트워크를 통한 설문지 샘플링 조사는 베이징(北京), 홍콩, 다렌(大連), 창춘(長春), 창사(長沙), 우한(武漢)에서 진행하였으며, 현지조사는 주로 원 투 원 방식을 취했는데 주요 내용은 CSR 활동 사례, CSR에 대한 전반적 질문, 규모측정, 인구통계학적 문제로 구성되었다. 본 논문은 다음과 같은 6가지의 가설을 설정하고 연구를 진행하였는데 설문조사와 통계분석을 통해 다음과 같은 결론과 시사점을 도출하였다. 첫째, CSR 활동 중 사회 경제적 책임감과 환경보호 요소 변수는 기업의 CSR 적합성에 대해 긍정적인 영향을 미친다. 둘째, 적합성 변수 중 기업과 CSR 활동 간 적합성 변수는 기업의 신뢰도에 긍정적인 영향을 미친다. 셋째, 기업 신뢰도 변수는 소비자의 모든 태도 변수 즉 인지적 태도, 감정적 태도, 행위적 태도를 포함한 태도 변수에 긍정적인 영향을 미칠 뿐만 아니라 기업 평판에도 긍정적 효과로 작용한다. 넷째, 삼성과 기타 중국 진출 대기업들은 CSR 활동과 기업의 CSR 적합성, 기업 신뢰도, 기업 평판, 브랜드 태도 간의 상호관계 면에서 차이점을 보이고 있다는 결론을 도출해 내었다.
Semi-deterministic Sparse Matrix for Low Complexity Compressive Sampling
( Lei Quan ),( Song Xiao ),( Xiao Xue ),( Cunbo Lu ) 한국인터넷정보학회 2017 KSII Transactions on Internet and Information Syst Vol.11 No.5
The construction of completely random sensing matrices of Compressive Sensing requires a large number of random numbers while that of deterministic sensing operators often needs complex mathematical operations. Thus both of them have difficulty in acquiring large signals efficiently. This paper focuses on the enhancement of the practicability of the structurally random matrices and proposes a semi-deterministic sensing matrix called Partial Kronecker product of Identity and Hadamard (PKIH) matrix. The proposed matrix can be viewed as a sub matrix of a well-structured, sparse, and orthogonal matrix. Only the row index is selected at random and the positions of the entries of each row are determined by a deterministic sequence. Therefore, the PKIH significantly decreases the requirement of random numbers, which has a complex generating algorithm, in matrix construction and further reduces the complexity of sampling. Besides, in order to process large signals, the corresponding fast sampling algorithm is developed, which can be easily parallelized and realized in hardware. Simulation results illustrate that the proposed sensing matrix maintains almost the same performance but with at least 50% less random numbers comparing with the popular sampling matrices. Meanwhile, it saved roughly 15%-35% processing time in comparison to that of the SRM matrices.
( Xiao Lin Ji ),( Qi Wang ),( Yu Long Gao ),( Yong Qiang Wang ),( Li Ting Qin ),( Xiao Le Qi ),( Hong Lei Gao ),( Xiao Mei Wang ) 한국미생물 · 생명공학회 2013 Journal of microbiology and biotechnology Vol.23 No.5
Recently, there has been a growing body of evidence showing that cellular microRNAs (miRNAs) are involved in virus-host interactions. Numerous studies have focused on analyses of the expression profiles of cellular miRNAs, but the expression patterns of Dicer, which is responsible for the generation of miRNAs, have only rarely been explored in Gallus gallus. We developed a duplex realtime reverse transcriptase polymerase chain reaction (RTPCR) assay for the relative quantification of the mRNAs of Dicer and β-actin in G. gallus. To apply this method, the expression of Dicer in avian cells after infection with avian leukosis virus subgroup J (ALV-J) was detected using our established duplex real-time RT-PCR. The duplex realtime RT-PCR assay is sufficiently sensitive, specific, accurate, reproducible, and cost-effective for the detection of Dicer in G. gallus. Furthermore, this study, for the first time, demonstrated that ALV-J can induce differential expression of Dicer mRNA in the ALV-J-infected cells.