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Yao Alex Yao,Bao Ying 한국마케팅과학회 2024 Journal of Global Fashion Marketing Vol.15 No.2
Previously less notable behind the primary market, the pre-owned luxury market has grown rapidly during the past five years as luxury resale has become a new normal. This market presents some new challenges that do not apply to the traditional luxury market, yet limited research explores it. This paper fills this gap by investigating information disclosure and pricing effects in pre-owned luxury product promotion in the digital market. Analysis of a unique dataset from a leading luxury resale online platform suggests that providing more information through visual cues reduces information asymmetry and facilitates transactions, but the effect is moderated if pre-owned products are in newer conditions. High prices also have an overall negative effect on sales, but the effect is moderated among newer products because they provide higher price-prestige value. Managerial implications to sellers and the platform are discussed.
BtPDR: Bluetooth and PDR-Based Indoor Fusion Localization Using Smartphones
( Yingbiao Yao ),( Qiaojing Bao ),( Qi Han ),( Ruili Yao ),( Xiaorong Xu ),( Junrong Yan ) 한국인터넷정보학회 2018 KSII Transactions on Internet and Information Syst Vol.12 No.8
This paper presents a Bluetooth and pedestrian dead reckoning (PDR)-based indoor fusion localization approach (BtPDR) using smartphones. A Bluetooth and PDR-based indoor fusion localization approach can localize the initial position of a smartphone with the received signal strength (RSS) of Bluetooth. While a smartphone is moving, BtPDR can track its position by fusing the localization results of PDR and Bluetooth RSS. In addition, BtPDR can adaptively modify the parameters of PDR. The contributions of BtPDR include: a Bluetooth RSS-based Probabilistic Voting (BRPV) localization mechanism, a probabilistic voting-based Bluetooth RSS and PDR fusion method, and a heuristic search approach for reducing the complexity of BRPV. The experiment results in a real scene show that the average positioning error is < 2m, which is considered adequate for indoor location-based service applications. Moreover, compared to the traditional PDR method, BtPDR improves the location accuracy by 42.6%, on average. Compared to state-of-the-art Wireless Local Area Network (WLAN) fingerprint + PDR-based fusion indoor localization approaches, BtPDR has better positioning accuracy and does not need the same offline workload as a fingerprint algorithm.
Effects of Wind Generation Uncertainty and Volatility on Power System Small Signal Stability
Li-Bao Shi,Li Kang,Liang-Zhong Yao,Shi-Yao Qin,Rui-Ming Wang,Jin-Ping Zhang 대한전기학회 2014 Journal of Electrical Engineering & Technology Vol.9 No.1
This paper discusses the impacts of large scale grid-connected wind farm equipped with permanent magnet synchronous generator (PMSG) on power system small signal stability (SSS) incorporating wind generation uncertainty and volatility. Firstly, a practical simplified PMSG model with rotor-flux-oriented control strategy applied is derived. In modeling PMSG generator side converter, the generator-voltage-oriented control strategy is utilized to implement the decoupled control of active and reactive power output. In modeling PMSG grid side converter, the grid-voltageoriented control strategy is applied to realize the control of DC link voltage and the reactive power regulation. Based on the Weibull distribution of wind speed, the Monte Carlo simulation technique based is carried out on the IEEE 16-generator-68-bus test system as benchmark to study the impacts of wind generation uncertainty and volatility on small signal stability. Finally, some preliminary conclusions and comments are given.
Zhuang Bao-Jun,Xu Su-Yun,Dong Liang,Zhang Pei-Hai,Zhuang Bao-Lin,Huang Xiao-Peng,Li Guang-Sen,You Yao-Dong,Chen Di'Ang,Yu Xu-Jun,Chang De-Gui 대한남성과학회 2022 The World Journal of Men's Health Vol.40 No.4
The protein encoded by dynein axonemal heavy chain 1 (DNAH1) is a part of dynein, which regulates the function of cilia and sperm flagella. The mutant of DNAH1 causes the deletion of inner dynein arm 3 in the flagellum, leading to multiple morphological abnormalities of the sperm flagella (MMAF) and severe asthenozoospermia. However, instead of asthenozoospermia and MMAF, the result caused by the mutation of DNAH1 remains unknown. Here we report a male infertility patient with severe asthenozoospermia and teratozoospermia. We found two heterozygous mutations in DNAH1 (c.6912C>A and c.7076G>T) and which were reported to be associated with MMAF for the first time. We next collected and analyzed 65 cases of DNAH1 mutation and found that the proportion of short flagella is the largest, while the bent flagella account for the smallest, and the incidence of head deformity is not high in the sperm of these patients. Finally, we also analyzed 31 DNAH1 mutation patients who were treated with intracytoplasmic sperm injection (ICSI) and achieved beneficial outcomes. We hope our research will be helpful in the diagnosis and treatment of male infertility caused by DNAH1 mutation.
Effects of Wind Generation Uncertainty and Volatility on Power System Small Signal Stability
Shi, Li-Bao,Kang, Li,Yao, Liang-Zhong,Qin, Shi-Yao,Wang, Rui-Ming,Zhang, Jin-Ping The Korean Institute of Electrical Engineers 2014 Journal of Electrical Engineering & Technology Vol.9 No.1
This paper discusses the impacts of large scale grid-connected wind farm equipped with permanent magnet synchronous generator (PMSG) on power system small signal stability (SSS) incorporating wind generation uncertainty and volatility. Firstly, a practical simplified PMSG model with rotor-flux-oriented control strategy applied is derived. In modeling PMSG generator side converter, the generator-voltage-oriented control strategy is utilized to implement the decoupled control of active and reactive power output. In modeling PMSG grid side converter, the grid-voltage-oriented control strategy is applied to realize the control of DC link voltage and the reactive power regulation. Based on the Weibull distribution of wind speed, the Monte Carlo simulation technique based is carried out on the IEEE 16-generator-68-bus test system as benchmark to study the impacts of wind generation uncertainty and volatility on small signal stability. Finally, some preliminary conclusions and comments are given.
Synthesis and characterization of novel Ti-containing mesoporous silicas support
Peihong Yao,Weiwei Hu,Yan Bao,Cuiling Zhang,Bochao Zhu,Wenxia Liu,Yongxiao Bai 한양대학교 세라믹연구소 2011 Journal of Ceramic Processing Research Vol.12 No.3
Titanium-containing novel mesoporous silicas have been synthesized at ambient temperature by a sol-gel method using amines with alkyl chains of 10-16 carbon atoms as a templating surfactant. An identical synthesis procedure was followed together with the addition of different amounts of titanium (IV) source in the synthesis gels to obtain its titanium-containing silicate gels. Following this synthesis route, it was possible to prepare materials without forming extrawall TiO2. The transparent gel formed as a precursor resulted in a relatively high titanium incorporation in the silicate framework of up to 0.4% Ti. The characterization results show that most Ti4+ are isolated and tetrahedrally incorporated into the framework of the silicate gel. Raman spectra and UV-vis spectra indicated that most Ti atoms were incorporated as isolated Ti sites into the silicate framework, and materials with a higher wt% Ti using relatively more coordination agent to prevent TiO2 forming anatase.
Han, Bao-Lin,Xu, Xiang-Ying,Zhang, Chun-Zhi,Wu, Jian-Juan,Han, Chun-Feng,Wang, Hui,Wang, Xuan,Wang, Guang-Shun,Yang, Shu-Juan,Xie, Yao Asian Pacific Journal of Cancer Prevention 2012 Asian Pacific journal of cancer prevention Vol.13 No.6
Objective: To conduct a meta-analysis to investigate the value of EBV DNA in diagnosis of nasopharyngeal cancer (NPC) in Asian populations, and provide important evidence for screening. Methods: Prospective or respective case-control or cohort studies regarding the detection role of EBV DNA for NPC were included in our study. We conducted a comprehensive literature search in PubMed, EMBASE, and the Chinese Biomedical Database (CBM database between January 1980 and March 2012. Results: A total of 18 studies with 1492 NPC cases and 2641 health controls were included. Almost of the included studies were conducted in China, and only one other conducted in Thailand. The overall results demonstrated that the pooled sensitivity, specificity, positive likelihood (+LR) and negative likelihood (-LR) were 0.73 (0.71-0.75), 0.89 (0.88-0.90), 8.84 (5.65-13.84) and 0.19(0.11-0.32), respectively. The overall EBV DNA detection showed the largest area of 0.932 under the summary receiver operator curve (SROC). The accuracy of detection by plasma for NPC (0.86) was higher than in serum (0.81), with largest areas under the SROC of 0.97 and 0.91, respectively. Conclusion: Our results demonstrated the EBV DNA detection in plasma or serum has high sensitivity and specificity in diagnosis of NPC, especially in Chinese populations with a high risk of cancer.
High Expression of Forkhead Box Protein C2 is Related to Poor Prognosis in Human Gliomas
Wang, Yao-Wu,Yin, Chun-Li,Zhang, Hong-Yi,Hao, Jin-Min,Yang, Yue-Ye,Liao, Heng,Jiao, Bao-Hua Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.24
Background: Increasing evidence has indicated that high Forkhead box protein C2 (FOXC2) level is closely associated with the development, progression, and poor prognosis of a variety of tumors. However, the relationship between FOXC2 and the progression of human gliomas remains to be clarified. The aim of present study was to assess FOXC2 expression and to explore its contribution in human gliomas. Materials and Methods: Realtime quantitative PCR was performed to examine FOXC2 expression in 85 pairs of fresh frozen glioma tissues and corresponding non-neoplastic brain tissues. Associations of FOXC2 expression with clinicopathological factors and prognosis of glioma patients were statistically analyzed. Results: The relative mRNA expression of FOXC2 was significantly higher in glioma tissues than the corresponding non-neoplastic brain tissues (p<0.001). In addition, high FOXC2 expression was significantly associated with advanced pathological grade (P=0.005) and the low Karnofsky performance score (KPS) (p=0.003), correlating with poor survival (p<0.001). Furthermore, multivariate Cox regression analysis showed that high FOXC2 expression was an independent predictor of overall survival (p=0.006). Conclusions: FOXC2 may act as an oncogenic gene and represent a potential regulator of aggressive development and a candidate prognostic marker in human gliomas.
Effect of Temperature on Wear Behavior in a Ti-V-Cr Base Fireproof Titanium Alloy
Guang-Bao Mi,Kai Yao,Xiao-Hua Min 한국정밀공학회 2017 International Journal of Precision Engineering and Vol.18 No.11
Dry sliding wear tests on pin-on-disk samples were performed in a Ti-35V-15Cr-0.3Si-0.1C fireproof titanium alloy against itself at different temperatures from 298 K to 1173 K. The mean friction coefficient and volume wear rate gradually decreased with an increase of testing temperature, although the volume wear rate at 1173 K exhibited a reverse trend. The tribo-oxide layer did not exist on the worn surface at 298 K, while discontinuous thin tribo-oxide layer was observed at 823 K. The tribo-oxide layer became thick and continuous at 973 K and it contacted with the substrate compactly. When the temperature increased up to 1173 K, the tribo-oxide layer further became thick with formation of cracks inside the layer. The adhesive wear and abrasive wear were the predominant wear mechanism at 298 K. With increasing the testing temperature, the wear mechanism underwent a transition from the abrasive wear and oxidative wear at 823 K to the mild oxidative wear at 973 K, and further to the severe oxidative wear at 1173 K.