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A Single-phase Buck-boost AC-AC Converter with Three Legs
Min Zhou,Yao Sun,Mei Su,Xing Li,Fulin Liu,Yonglu Liu 대한전기학회 2018 Journal of Electrical Engineering & Technology Vol.13 No.2
This paper proposes a single-phase buck-boost AC-AC converter. It consists of three legs with six switching units (each unit is composed of an active switch and a diode) and its input and output ports share a common ground. It can provide buck-boost voltage operation and immune from shoot-through problem. Since only two switching units are involved in the current paths, the conduction losses are low, which improves the system efficiency. The operation principle of the proposed circuit is firstly presented, and then, various operation conditions are introduced to achieve different output voltages with step-changed frequencies. Additionally, the parameters design and comparative analysis of the power losses are also given. Finally, experimental results verify the correctness of the proposed converter.
A Single-phase Buck-boost AC-AC Converter with Three Legs
Zhou, Min,Sun, Yao,Su, Mei,Li, Xing,Liu, Fulin,Liu, Yonglu The Korean Institute of Electrical Engineers 2018 Journal of Electrical Engineering & Technology Vol.13 No.2
This paper proposes a single-phase buck-boost AC-AC converter. It consists of three legs with six switching units (each unit is composed of an active switch and a diode) and its input and output ports share a common ground. It can provide buck-boost voltage operation and immune from shoot-through problem. Since only two switching units are involved in the current paths, the conduction losses are low, which improves the system efficiency. The operation principle of the proposed circuit is firstly presented, and then, various operation conditions are introduced to achieve different output voltages with step-changed frequencies. Additionally, the parameters design and comparative analysis of the power losses are also given. Finally, experimental results verify the correctness of the proposed converter.
Wu, Min-Qing,Hu, Pan,Gao, Jie,Wei, Wei-Dong,Xiao, Xiang-Sheng,Tang, Hai-Lin,Li, Xing,Ge, Qi-Dong,Jia, Wei-Hua,Liu, Ren-Bin,Xie, Xiao-Ming Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.1
Background: Low tyrosine-protein phosphatase nonreceptor type 12 (PTPN12) expression may be associated with breast cancer growth, proliferation, and metastasis. However, the prognostic value of PTPN12 in breast cancer has not been clearly identified. Patients and Methods: 51 triple-negative breast cancer (TNBC) patients and 83 non-TNBC patients with a histopathology diagnosis from October 2001 to September 2006 were included in this study. Immunohistochemical staining for PTPN12 on tissue microarrays was conducted. Results: High PTPN12 expression was seen in 39.2% of TNBC and 60.2 % of non-TNBC cases. Low PTPN12 expression was associated with lymph node status (p = 0.002) and distant metastatic relapse (p = 0.002) in TNBC patients. Similarly, low PTPN12 expression in non-TNBC patients was significantly correlated with lymph node status (p = 0.002), stage (p = 0.002) and distant metastatic relapse (p = 0.039). The high PTPN12 expression group was associated with longer DFS and OS compared with low PTPN12 expression group only in TNBC cases (p = 0.005, p = 0.015), according to univariate Cox regression analysis. Conclusion: These findings provide evidence that low expression of PTPN12 is associated with worse prognosis and may be used as a potential prognostic biomarker in TNBC patients.
Su Liu,Ye Cao,Yu-Xing Zhang,Yue-Min Pan,Shi-Guang Li 한국응용곤충학회 2017 Journal of Asia-Pacific Entomology Vol.20 No.4
In insects, glutathione S-transferases (GSTs) play essential roles in the detoxification of xenobiotic toxins and elimination of oxidative stress induced by toxic compounds. In the present study, a delta class GST gene (AiGSTd) was identified and characterized in the black cutworm, Agrotis ipsilon (Lepidoptera: Noctuidae). The deduced protein sequence of AiGSTd contained highly conserved features of GST enzymes and shared high identities with its orthologs from other lepidopteran species. Recombinant AiGSTD protein was expressed in Escherichia coli and purified. The protein displayed the GSH-dependent conjugating activity toward the substrate 1-chloro-2,4-dinitrobenzene (CDNB). Moreover, AiGSTD had the ability to protect DNA from oxidative damage, and the E. coli cells overexpressing AiGSTD showed long-term resistance to oxidative stress. The AiGSTd transcripts were most abundant in the larval midgut. Exposure to chlorpyrifos and lambda-cyhalothrin increased lipid peroxidation in larvae and significantly upregulated AiGSTd expression levels. This study is the first report of molecular characterization of a GST in A. ipsilon, and the present study suggest that AiGSTD might be involved in protecting against the oxidative stress induced by insecticides.
Staged Improvement in Awareness of Disease for Elderly Cancer Patients in Southern China
Li, Xing,Dong, Min,Wen, Jing-Yun,Wei, Li,Ma, Xiao-Kun,Xing, Yan-Fang,Deng, Yun,Chen, Zhan-Hong,Chen, Jie,Ruan, Dan-Yun,Lin, Ze-Xiao,Wang, Tian-Tian,Wu, Dong-Hao,Liu, Xu,Hu, Hai-Tao,Lin, Jia-Yu,Li, Zhu Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.15
Background: In mainland China, awareness of disease of elderly cancer patients largely relies on the patients' families. We developed a staged procedure to improve their awareness of disease. Materials and Methods: Participants were 224 elderly cancer patients from 9 leading hospitals across Southern China. A questionnaire was given to the oncologists in charge of each patient to evaluate the interaction between family and patients, patient awareness of their disease and participation in medical decision-making. After first cycles of treatment, increased information of disease was given to patients with cooperation of the family. Then patient awareness of their disease and participation in medical decision-making was documented. Results: Among the 224 cancer elderly patients, 26 (11.6%) made decisions by themselves and 125 (55.8%) delegated their rights of decision-making to their family. Subordinate family members tended to play a passive role in decision-making significantly. Patients participating more in medical decision-making tended to know more about their disease. However, in contrast to the awareness of disease, patient awareness of violation of medical recommendations was reversely associated with their participation in medical decision-making. Improvement in awareness of diagnosis, stages and prognosis was achieved in about 20% elderly cancer patients. About 5% participated more actively in medical decision-making. Conclusions: Chinese elderly cancer patient awareness of disease and participation in medical decision-making is limited and relies on their family status. The staged procedure we developed to improve patient awareness of disease proved effective.
Zhong-fu Liu,Jun-xing Zhang,Shao-min Li 보안공학연구지원센터 2016 International Journal of Smart Home Vol.10 No.8
Intelligent greenhouse monitoring technique is an efficient agricultural control technique emerging recently. The threshold value control of the switching value is the most-adopted greenhouse control method. Due to unique characteristics of greenhouse, the existing monitoring style cannot meet the great demand of greenhouse for intensive monitoring. Concerning the monitoring demands of the greenhouse and based on the technique of Internet of Things, this paper introduces the multisensory fusion technique to the intelligent greenhouse monitoring system. The greenhouse environmental monitoring system based on ZigBee is built, and a two-layer fusion method of “sensor+aggregation node” is put forward. The Kalman filtering method and the weighted average method are employed to conduct sensor node fusion and aggregation node fusion, respectively. An experiment is carried out to verify the built model with the experimental results suggesting that the two-layer fusion method can improve the measurement accuracy and stability of the greenhouse environmental monitoring system.
The Visible Human Projects in Korea and China with improved images and diverse applications.
Dai, Jing-Xing,Chung, Min Suk,Qu, Rong-Mei,Yuan, Lin,Liu, Shu-Wei,Shin, Dong Sun Springer International 2012 Surgical and radiologic anatomy Vol.34 No.6
<P>The Visible Human Projects, which were launched in the United States, have also been developed in Korea and China during the past decade. This article includes the new trials to promote a variety of their applications.</P>
( Luo Ming Fang ),( Xing Jian Min ),( Gou Zhong Xuan ),( Liu Hui Zhou ),( Chen Jia Yong ) 한국화학공학회 2003 Korean Journal of Chemical Engineering Vol.20 No.4
The desulfurization of dibenzothiophene (DBT), 4,6-dimethyldibenzothiophene (4,6-DMDBT) and their mixture by lyophilized cells of Pseudomonas delafieldii R-8 was studied in the presence of dodecane. The desulfurization rate for 4,6-DMDBT was found to be about 40% in comparison with that for DBT. The desulfurization process for DBT and 4,6-DMDBT proceeded simultaneously without preference for either one. The desulfurization rate for each compound was decreased when they were mixed together. The extent of desulfurization of 4,6-DMDBT was increased with the increase of cell concentration and the decrease of the volume ratio of oil-to-water used. The specific desulfurization rate for 4,6-DMDBT could be reached to 10.4 mmol sulfur kg^(-1) (cell) h^(-1) [approximately 0.33 mg sulfur g^(-1) (cell) h^(-1)]. Pseudomonas delafieldii R-8 showed high desulfurization capability for straight-run diesel oil (containing 1,807 mg/L of sulfur). About 1,000 mg/L of sulfur in diesel oil was removed by resting cells of this strai in 24 h of reaction. The specific desulfurization rate was 8.75 mmol sulfur kg^(-1) (cell) h^(-1).