http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Xiaoqin Wang,Guizhen Li,노경호 대한화학회 2017 Bulletin of the Korean Chemical Society Vol.38 No.2
A novel deep eutectic solvent (DES) and ionic liquid (IL)-modified graphene (G) and graphene oxide (GO) were synthesized and used as effective adsorbents for the preconcentration of three chlorophenols (CPs), 4-chlorophenol (4-CP), 2,4-dichlorophenol (2,4-DCP), and 2,4,6-trichlorophenol (2,4,6-TCP), in environmental water samples prior to high-performance liquid chromatography (HPLC). The new materials were characterized by scanning electron microscopy (S-4200) and Fourier-transform infrared spectrometry. The prepared functionalized GO@silica shows remarkable adsorption capacity toward CPs. When used as solid-phase extraction (SPE) sorbents, a superior recovery (88.49–89.70%) could be obtained compared to commercial sorbents, such as silica and aminosilica. Based on this, a method for the analysis of CPs in water samples was established by coupling SPE with HPLC. These results highlight the potential new role of DES and IL-modified GO in the preparation of analytical samples.
Xiaoqin Ha,Junhua Peng,Hongbin Zhao,Zhiyun Deng,Juzi Dong,Hongyan Fan,Yong Zhao,Bing Li,Qiangsheng Feng,Zhihua Yang 대한의학회 2017 Journal of Korean medical science Vol.32 No.2
The present study developed an oral hepatocyte growth factor (HGF) gene therapy strategy for gastric ulcers treatment. An attenuated Salmonella typhimurium that stably expressed high HGF (named as TPH) was constructed, and the antiulcerogenic effect of TPH was evaluated in a rat model of gastric ulcers that created by acetic acid subserosal injection. From day 5 after injection, TPH (1 × 109 cfu), vehicle (TP, 1 × 109 cfu), or sodium bicarbonate (model control) was administered orally every alternate day for three times. Then ulcer size was measured at day 21 after ulcer induction. The ulcer area in TPH-treated group was 10.56 ± 3.30 mm2, which was smaller when compared with those in the TP-treated and model control groups (43.47 ± 4.18 and 56.25 ± 6.38 mm2, respectively). A higher level of reepithelialization was found in TPH-treated group and the crawling length of gastric epithelial cells was significantly longer than in the other two groups (P < 0.05). The microvessel density in the ulcer granulation tissues of the TPH-treated rats was 39.9 vessels/mm2, which was greater than in the TP-treated and model control rats, with a significant statistical difference. These results suggest that TPH treatment significantly accelerates the healing of gastric ulcers via stimulating proliferation of gastric epithelial cells and enhancing
IFree Filter-Based User Positioning for Satellite-Based Augmentation System
Kun Li,Xuanwen Wang,Shuaiyong Zheng,Shuailong Chen,Mengzhi Gao,Peng Yang,Xiaoqin Jin,Jianlei Yang 한국항공우주학회 2024 International Journal of Aeronautical and Space Sc Vol.25 No.2
Ionospheric storms and scintillation cause great impact on the service performance of single-frequency Satellite-Based Augmentation System (SBAS). On the one hand, conservative estimation method of the ionospheric integrity information can lead to the problem of over-wrapping in the pseudorange domain and cannot make it optimal to the service performance of SBAS. On the other hand, the performance of the ionospheric Kriging method is unstable in some regions with active ionospheric. Meanwhile, there will be a growing number of dual-frequency users with the development of GNSS. This paper proposes IFree Filter-based user positioning algorithm for SBAS and analyzes the positioning performance of 36 Monitor stations in North America. First, high-order differential method is used to detect cycle slip of dual-frequency carrier-phase observation, and chi-square test is used to detect and eliminate outliers. Then, the dual-frequency pseudorange is smoothed with the dual-frequency carrier phase after cycle slip repair, and the ionospheric delay is treated with IFree filter. Compared with the Wide Area Augmentation System (WAAS) algorithm, the signal-in-space correction accuracy by the proposed algorithm is significantly improved, which can provide LPV200 services for most regions in North America and even CAT-I services for some regions, and can be applied as key technologies to monitor stations and information processing center of the civil services platform for BeiDou Satellite-Based Augmentation System (BDSBAS).
Extraction of Quercetin from Ginkgo biloba by DESs-based Monolithic Cartridge with RP-HPLC
( Wang Xiaoqin ),( Li Guizhen ),노경호 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1
Deep eutectic solvents (DES) were synthesized with choline chloride (ChCl), template molecular monolithic (TMM) and non-DES monolithic (N-DES-M) without template, were prepared in an identical procedure. Fourier transform infrared spectrometer (FT-IR) and field emission scanning electron microscopy (FE-SEM) were used to characterize the obtained polymers. Rebinding experiment and solid-phase extraction (SPE) were used to prove the high selectivity adsorption properties of the polymers. The optimum extraction condition was found to be: ultrasonic time optimized (30 min), the volume fraction of ethanol and ratio of liquid to material (20 mL g-1). Under these conditions, the extraction yield of quercetin was 290.8 mg g-1. Purification of Ginkgo biloba extract was achieved by SPE process. The results showed DES-sbased monolithic cartridge had potential for promising functional adsorption material for the purification of bioactive compounds.
Analysis of Social Media Utilization based on Big Data-Focusing on the Chinese Government Weibo
Xiang Li,Xiaoqin Guo,Soo Kyun Kim,Hyukku Lee 한국인터넷정보학회 2022 KSII Transactions on Internet and Information Syst Vol.16 No.8
The rapid popularity of government social media has generated huge amounts of text data, and the analysis of these data has gradually become the focus of digital government research. This study uses Python language to analyze the big data of the Chinese provincial government Weibo. First, this study uses a web crawler approach to collect and statistically describe over 360,000 data from 31 provincial government microblogs in China, covering the period from January 2018 to April 2022. Second, a word separation engine is constructed and these text data are analyzed using word cloud word frequencies as well as semantic relationships. Finally, the text data were analyzed for sentiment using natural language processing methods, and the text topics were studied using LDA algorithm. The results of this study show that, first, the number and scale of posts on the Chinese government Weibo have grown rapidly. Second, government Weibo has certain social attributes, and the epidemics, people's livelihood, and services have become the focus of government Weibo. Third, the contents of government Weibo account for more than 30% of negative sentiments. The classified topics show that the epidemics and epidemic prevention and control overshadowed the other topics, which inhibits the diversification of government Weibo.
林晓勤(Xiaoqin Lin),杨茹斐(Rufei Yang),杨洁(Jie Yang),李言栩(Yanxu Li),付媛姝(Yuanshu Fu) YIXIN 출판사 2024 教育教学研究论丛 Vol.2 No.4
为探讨大学生手机成瘾、自我控制与学习倦怠的关系及作用机制,本文采用大学生手机成瘾倾向量表、大学生学习倦怠量表、自我控制量表,对1077 名在校大学生进行实测并使用潜变量结构方程模型进行数据分析,结果发现:(1)手机成瘾与学习倦怠及其分维度均显著正相关,二者与自我控制及其分维度均显著负相关(P <0.001);(2)自我控制在手机成瘾与学习倦怠之间起到的调节作用显著(β =0.11,P <0.001);(3)在自我控制较高时,手机成瘾对学习倦怠的影响不显著(β =0.06,P >0.05);在自我控制较低时,手机成瘾对学习倦怠的影响显著(β =-0.16,P <0.001),随着手机成瘾程度的增强,学习倦怠在一定程度上有所降低,但自我控制较低的情况下始终具有较强的学习倦怠。大学生手机成瘾对学习倦怠具有正向影响,自我控制能调节手机成瘾与学习倦怠的关系。 To explore the relationship and mechanism of mobile phone addiction, self-control and learning burnout among college students, 1077 college students were measured by College Students’ Mobile Phone Addiction Tendency Scale, College Students’ Learning Burnout Scale and Self-Control Scale, and the data were analyzed by latent variable structural equation model in this paper. It finds that (1) Mobile phone addiction was positively correlated with learning burnout and its sub-dimensions, and negatively correlated with self-control and its sub-dimensions (P < 0.001). (2) Self-control played a significant moderating role between mobile phone addiction and learning burnout (β = 0.11, P < 0.001); (3) When self-control was high, mobile phone addiction had no significant effect on learning burnout (β = 0.06, P > 0.05). When self-control was low, mobile phone addiction had a significant effect on learning burnout (β = -0.16, P < 0.001). With the increase of mobile phone addiction, learning burnout decreased to a certain extent, but there was always strong learning burnout in the case of low self-control. College students’ mobile phone addiction has a positive impact on learning burnout, and self-control can regulate the relationship between mobile phone addiction and learning burnout.
Chun Li,Zhi-Jun Wuxiao,Xiaoqin Chen,Guanjun Chen,Yue Lu,Zhongjun Xia,Yang Liang,Hua Wang 대한암학회 2020 Cancer Research and Treatment Vol.52 No.2
Purpose Lymphoblastic lymphoma (LBL) is an invasive neoplasm of precursor T-cell or B-cell lineage. A broadly accepted standard treatment for adult LBL has not yet been defined. Materials and Methods To address this issue, we compared two chemotherapy regimens: a modified non-Hodgkin lymphoma Berlin–Frankfurt–Mu!nster-95 (NHL-BFM-95) regimen and HyperCVAD/MA. This retrospective study consecutively enrolled 207 adult LBL patients at two hospitals from 2000 to 2018. Univariate and multivariate analysis were used to assess prognostic factors. Results In the present study, most clinical characteristics were similar between the two treatment groups except for age and lactate dehydrogenase (LDH) level. Patients treated with modified NHL-BFM-95 regimen tended to be younger and with elevated LDH level. The modified NHLBFM- 95 regimen produced better treatment outcomes than those with HyperCVAD/MA in patients with T-LBL or patients < 40 years. Treatment with HyperCVAD/MA, high Eastern Cooperative Oncology Group scores, and bone marrow involvement were independent risk factors in T-LBL. No patients interrupted treatment for severe adverse events. Conclusion The results suggested that the modified regimen is well-tolerated and can produce the promising outcomes in patients with T-LBL or patients < 40 years.