S-C3N4 Quantum Dot Decorated ZnO Nanorods to Improve Their Photoelectrochemical Performance

Haizhou He,Jie Li,Yang Liu,Qiong Liu,Faqi Zhan,Yaomin Li,Wenzhang Li,Jin Wen 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2017 NANO Vol.12 No.5

"S-doped C3N4 quantum dots (SCNQDs) were synthesized successfully by a low-temperature solid-phase method. The as-synthesised SCNQDs were decorated on ZnO nanorods by a dipping method. The ZnO nanorod films were prepared through a two-stage method, including pulse electrodeposition for depositing ZnO seed layer on fluorine doping SnO2 glass (FTO) and chemical bath for growing ZnO nanorods on the ZnO seed layer. The prepared samples were characterized via scanning electron microscope (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), UV-vis absorption spectroscopy, X-ray photoelectron spectroscopy (XPS). The photoelectrochemical performances of the prepared samples were estimated using linear sweep voltammograms, electrochemical impedance spectra (EIS), Mott–Schottky, transient photocurrent and incident photon-to-current conversion efficiency (IPCE). The results show that the light absorption edge of the prepared SCNQDs increases from 326 nm (CNQDs) to 349 nm after S doping. The CNQD decorated ZnO photoanode film exhibits 1.34 times as high photocurrent as bare ZnO photoanode film. Importantly, the photocurrent increased to 1.79 times than bare ZnO photoanode film by S doping at 1.0 V (versus Ag/AgCl), which is attributed to a wider light absorption of SCNQDs and a better efficiency of electron transfer in the interface between SCNQDs and ZnO."

Chinese Word Segmentation

( Haizhou Li ),( Baosheng Yuan ) 한국언어정보학회 1998 국제 워크샵 Vol.1998 No.-

Chinese word segmentation has been a very important research topic not only because it is usually the veryfirst step for Chinese text processing, but also because its high accuracy is a prerequisite for a high performance Chinese text processing such as Chinese input, speech recognition, machine translation and language understanding, etc. This paper gives a review on the development of Chinese word segmentation techniques that have been applied to various applications on Chinese text processing. As the methodology varies in a very wide range according to its applications, in this paper it is viewed in terms of the knowledge resources on which segmentation methods based. We summarize the methods into two categories, that is, lexical knowledge based and linguistic knowledge based methods.

Perspectives on China’s Economy and Economic Reform

Huang Haizhou 세계경제연구원 2015 세계경제연구원 간행물 Vol.16 No.6

중국의 경제개혁과 향후 전망

황 하이조우(Huang Haizhou) 세계경제연구원 2015 세계경제연구원 간행물 Vol.16 No.6

Influence of Partial Replacement of NaCl with KCl on Formation of Volatile Compounds in Jinhua Ham during Processing

Yingyang Zhang,Haizhou Wu,Jing Tang,Mingming Huang,Jianying Zhao,Jianhao Zhang 한국식품과학회 2016 Food Science and Biotechnology Vol.25 No.2

The influence of partial replacement of NaCl with KCl on formation of volatile compounds during Jinhua ham processing was evaluated using GC/MS system. Jinhua ham was treated with either 100% NaCl (I) or 60% NaCl and 40% KCl (II). Formation of volatile compounds increased in Jinhua hams during processing for both salt formulations, particularly at the end of the salting period. There were differences in volatile compound formation between formulations I and II after 45 days of processing. Contents of lipid-derived volatiles (hexanal) and Strecker aldehydes (2-methylbutanal and 3- methylbutanal) were higher in Jinhua hams treated with formulation II after 45 days of processing. Partial salt replacement of NaCl with KCl changed formation of volatile compounds in Jinhua hams and may have affected the flavor of finished products.

Effect of Monascus as a Nitrite Substitute on Color, Lipid Oxidation, and Proteolysis of Fermented Meat Mince

Xiang Yu,Haizhou Wu,Jianhao Zhang 한국식품과학회 2015 Food Science and Biotechnology Vol.24 No.2

Monascus spp. are fungi, traditionally eaten in Asian countries, that have the the potential to be used as a nitrite substitute in meat-product processing. Effects of using Monascus ruber MJ-1 as a nitrite substitute on color, lipid oxidation and proteolysis of fermented meat mince were investigated in this study. After 4 days of fermentation, a* and L* values for the samples were significantly higher and lower than the values for the control, respectively; however, b* values were significantly lower than that of the control throughout the fermentation process (p<0.05). Furthermore, Monascus ruber MJ-1 fermentation decreased the thiobarbituric acid reactive substances (TBARs) value and increased the myofibril fragmentation index (MFI) value of meat mince significantly (p<0.05). SDS-PAGE results further indicated that myofibrillar proteins were degraded during fermentation, while sarcoplasmic proteins were not. These results suggest prospects for the broad application of Monascus as a nitrite substitute in meat processing.

Long non-coding RNA H19X promotes tumorigenesis and metastasis of colorectal cancer through regulating the miR-503-5p/KANK1 axis

Yuan Zihan,Zhao Haizhou,Zhi Qiaoming,Wang Sentai,Liu Chao,Han Ye,Xu Zhihua,Liu Fei,Liu Xingyi,Zan Xinquan,Wang Qiang,Wan Daiwei 한국유전학회 2022 Genes & Genomics Vol.44 No.12

Background: It has been well established that the long non-coding RNAs (lncRNAs) plays a critical role in tumor progression. However, the function of these transcripts and mechanisms responsible for their deregulation in colorectal cancer (CRC) remain to be investigated. Objective: To explore the potential effect and regulation mechanism of lncRNA H19X in colorectal cancer. Methods: We predicted and validated long non-coding RNA H19X from microarray data of colorectal cancer tissues. In addition, the biological behaviors of H19X and miR-503-5p on CRC were examined in vitro and in vivo, including MTT, colony formation assay, Hoechst33342 and transwell assay. The mRNA and protein levels of KN Motif and Ankyrin Repeat Domains 1 (KANK1) were analyzed by Quantitative real-time PCR (qRT-PCR), western blotting (WB) assay. Moreover, bioinformatics tools and dual-luciferase reporter assay were applied to demonstrate the relationship between KANK1 and miR-503-5p. Results: H19X was remarkably up-regulated in CRC tissues. Its expression related to tumor size (p = 0.041), lymph node metastasis (p = 0.037), distal metastasis (p = 0.028), advanced TNM stage (p = 0.034) and poor survival in CRC. H19X acted as an oncogenic lncRNA that induced CRC cell proliferation, invasion and metastasis. Through a number of functional studies, we found that H19X silencing inhibited the malignance phenotype of cancer cells through loss of miR-503-5p. Further studies demonstrated that miR-503-5p was involved in the progression of CRC by directly regulating the downstream target KANK1. Conclusion: Collectively, the findings of the present study indicate H19X/miR-503-5p/KANK1 axis has critical role in the progression of colorectal cancer, providing an effective prognostic indicator and promising target in treatment of colorectal cancer.

The structural, electronic, elastic and optical properties of AlCu(Se1−xTex)2 compounds from first-principle calculations

Yongzhong Zhan,Mingjun Pang,Haizhou Wang,Yong Du 한국물리학회 2012 Current Applied Physics Vol.12 No.2

The structural, electronic structure, elastic and optical properties of the AlCu(Se1-xTex)2 compounds have been investigated by using a first-principles method based on density functional theory. The lattice constants of the quaternary compounds AlCu(Se1-xTex)2 increase with the increasing of Te composition. The calculated lattice constants for the ternary compounds i.e. AlCuSe2 and AlCuTe2 are in good agreement with the experimental data. The band structures show that the compounds have direct band gap and the band gaps are found to vary nonlinearly with composition. The total and part density of states of the quaternary AlCu(Se1-xTex)2 compounds are discussed. The calculated elastic constants indicate that all of the AlCu(Se1-xTex)2 compounds are mechanically stable. The bulk modulus B, shear modulus G,Young’s modulus E and Poisson’s ratio n can be obtained by using the VoigteReusseHill averaging scheme. The B/G ratios of the AlCu(Se1-xTex)2 compounds indicate that AlCu(Se0.8Te0.2)2 is ductile and the others are brittle. The Debye temperature of the AlCu(Se1-xTex)2 compounds decreases a little with increasing Te content except the compound with x¼ 0.4. The dielectric functions, refractive index,extinction coefficient, absorption spectrums and energy-loss function of the AlCuSe2 and AlCuTe2 are also calculated and discussed in this work. The structural, electronic structure, elastic and optical properties of the AlCu(Se1-xTex)2 compounds have been investigated by using a first-principles method based on density functional theory. The lattice constants of the quaternary compounds AlCu(Se1-xTex)2 increase with the increasing of Te composition. The calculated lattice constants for the ternary compounds i.e. AlCuSe2 and AlCuTe2 are in good agreement with the experimental data. The band structures show that the compounds have direct band gap and the band gaps are found to vary nonlinearly with composition. The total and part density of states of the quaternary AlCu(Se1-xTex)2 compounds are discussed. The calculated elastic constants indicate that all of the AlCu(Se1-xTex)2 compounds are mechanically stable. The bulk modulus B, shear modulus G,Young’s modulus E and Poisson’s ratio n can be obtained by using the VoigteReusseHill averaging scheme. The B/G ratios of the AlCu(Se1-xTex)2 compounds indicate that AlCu(Se0.8Te0.2)2 is ductile and the others are brittle. The Debye temperature of the AlCu(Se1-xTex)2 compounds decreases a little with increasing Te content except the compound with x¼ 0.4. The dielectric functions, refractive index,extinction coefficient, absorption spectrums and energy-loss function of the AlCuSe2 and AlCuTe2 are also calculated and discussed in this work.

Ab initio investigation into the structural, electronic and elastic properties of AlCu2TM (TM = Ti, Zr and Hf) ternary compounds

Mingjun Pang,Yongzhong Zhan,Haizhou Wang 한국물리학회 2012 Current Applied Physics Vol.12 No.3

The AleCueTM (TM = transition metal) alloy system has attracted great attention for both excellent glass-forming ability and its interesting physical properties. In this work, an investigation into the crystal,electrical and elastic properties of the AlCu2TM (TM = Ti, Zr, and Hf) compounds has been conducted by first-principles calculations based on density-functional theory. The fully relaxed structure parameters of the AlCu2TM compounds are in good agreement with previous experimental and other theoretical results. Besides, the cohesive energies of all the AlCu2TM compounds have been evaluated. The energy band and densities of state of these compounds are also obtained. According to the calculated single crystal elastic constants, all the compounds are mechanically stable. The polycrystalline bulk moduli,shear moduli, Young’s moduli and Poisson’s ratio have been deduced by using VoigteReusseHill (VRH)approximations. The calculated negative Cauchy pressure and ratio of bulk modulus to shear modulus indicated that the AlCu2TM compounds are ductile materials. The Debye temperatures of the AlCu2TM compounds decrease with increasing the TM (Ti, Zr, and Hf) atomic number.

Cross-Technology Localization: Leveraging Commodity WiFi to Localize Non-WiFi Device

( Dian Zhang ),( Rujun Zhang ),( Haizhou Guo ),( Peng Xiang ),( Xiaonan Guo ) 한국인터넷정보학회 2021 KSII Transactions on Internet and Information Syst Vol.15 No.11

Radio Frequency (RF)-based indoor localization technologies play significant roles in various Internet of Things (IoT) services (e.g., location-based service). Most such technologies require that all the devices comply with a specified technology (e.g., WiFi, ZigBee, and Bluetooth). However, this requirement limits its application scenarios in today's IoT context where multiple devices complied with different standards coexist in a shared environment. To bridge the gap, in this paper, we propose a cross-technology localization approach, which is able to localize target nodes using a different type of devices. Specifically, the proposed framework reuses the existing WiFi infrastructure without introducing additional cost to localize Non-WiFi device (i.e., ZigBee). The key idea is to leverage the interference between devices that share the same operating frequency (e.g., 2.4GHz). Such interference exhibits unique patterns that depend on the target device's location, thus it can be leveraged for cross-technology localization. The proposed framework uses Principal Components Analysis (PCA) to extract salient features of the received WiFi signals, and leverages Dynamic Time Warping (DTW), Gradient Boosting Regression Tree (GBRT) to improve the robustness of our system. We conduct experiments in real scenario and investigate the impact of different factors. Experimental results show that the average localization accuracy of our prototype can reach 1.54m, which demonstrates a promising direction of building cross-technology technologies to fulfill the needs of modern IoT context.