A Simplified Carrier-Based Pulse-Width Modulation Strategy for Two-level Voltage Source Inverters in the Over-modulation Region

Feng Jing,Feng-You He 전력전자학회 2017 JOURNAL OF POWER ELECTRONICS Vol.17 No.6

In this study, a carrier-based pulse-width modulation (PWM) method for two-level voltage source inverters in the over-modulation region is proposed. Based on the superposition principle, the reference voltage vectors outside the linear modulation boundary are adjusted to relocate to the vector hexagon, while their fundamental magnitudes are retained. In accordance with the adjusted reference vector, the corresponding modulated waves are respectively deduced in over-modulation mode I and II to generate the gate signals of the power switches, guaranteeing the linearity of the fundamental output phase voltage in the over-modulation region. Moreover, due to the linear relationship between the voltage vector and the duty ratios, the complicated sector identification and holding angle calculation found in previous methods are avoided in the modulated wave synthesis, which provides great simplicity for the proposed carrier-based over-modulation strategy. Experimental results demonstrate the effectiveness and validity of the proposed method.

Trojan

Feng Jing 한국콘텐츠학회 2018 ICCC International Digital Design Invitation Exhib Vol.2018 No.5

The Molecular Signatures of Acute-immobilization-induced Antinociception and Chronic-immobilization-induced Antinociceptive Tolerance

Jing-Hui Feng,Hee-Jung Lee,서홍원 한국뇌신경과학회 2019 Experimental Neurobiology Vol.28 No.6

In the present study, the productions of antinociception induced by acute and chronic immobilization stress were compared in several animal pain models. In the acute immobilization stress model (up to 1 hr immobilization), the antinociception was produced in writhing, tail-flick, and formalin-induced pain models. In chronic immobilization stress experiment, the mouse was enforced into immobilization for 1 hr/day for 3, 7, or 14 days, then analgesic tests were performed. The antinociceptive effect was gradually reduced after 3, 7 and 14 days of immobilization stress. To delineate the molecular mechanism involved in the antinociceptive tolerance development in the chronic stress model, the expressions of some signal molecules in dorsal root ganglia (DRG), spinal cord, hippocampus, and the hypothalamus were observed in acute and chronic immobilization models. The COX-2 in DRG, p-JNK, p-AMPKα1, and p-mTOR in the spinal cord, p-P38 in the hippocampus, and p-AMPKα1 in the hypothalamus were elevated in acute immobilization stress, but were reduced gradually after 3, 7 and 14 days of immobilization stress. Our results suggest that the chronic immobilization stress causes development of tolerance to the antinociception induced by acute immobilization stress. In addition, the COX-2 in DRG, p-JNK, p-AMPKα1, and p-mTOR in the spinal cord, p-P38 in the hippocampus, and p-AMPKα1 in the hypothalamus may play important roles in the regulation of antinociception induced by acute immobilization stress and the tolerance development induced by chronic immobilization stress.

Total Delay for Treatment among Cancer Patients: a Theory-guided Survey in China

Feng, Rui,Wang, De-Bin,Chai, Jing,Cheng, Jing,Li, Hui-Ping Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.10

Purpose: This study aimed at exploring treatment delay (TD) among cancer patients in China with an attempt to develop a practical methodology facilitating frontline Chinese clinicians in promoting earlier cancer diagnosis and treatment. Materials and Methods: The study comprised framework development, qualitative interviews and paired factor rating. Framework development utilized systematic literature review, soft systems thinking and consensus groups. Qualitative interviews employed a checklist of open questions soliciting information about all the domains included the framework from cancer patients drawn via stratified randomized sampling of inpatients at 10 hospitals in Hefei, China. Paired factor rating used a self-developed computer aid and the interviewed patients as referring cases to weigh the relative importance of the factors listed in the framework in terms of their contributions to specific components of total delay (TD). Results: a) A conceptual framework was proposed consisting of a 6-step path to TD and 36 category determinants. b) A total of 227 patients were interviewed; their TD was 267.3 mean or 108 median days ranging from 0 to 2475 days; average appraisal, illness, behavioral, preparation and treatment delay accounted for 52.1%, 9.4%, 0.30%, 8.8% and 29.4% of the TD respectively. Individual side factors were rated substantially more important than environmental side factors (60% vs. 40%); most influential TD factors included cancer symptoms, overall health, family relations and knowledge about cancer and health. Conclusions: The framework proposed together with the interviewing and rating approaches used provide a potential new methodology for understanding cancer patients' TD and promoting earlier cancer treatment.

Love Never Fades Away

Feng Jing 한국콘텐츠학회 2019 한국콘텐츠학회 ICCC 논문집 Vol.2019 No.12

Isolation, Structural Characterization, and Lymphopoiesis Stimulant Activity of a Polysaccharide from the Abalone Gonad

Jing-Feng Yang,Yue-hui Li,Jun Zhao,Peng-fei Li,Ce Zhu,Ye-han Song,Lan-yi Zhang,Bei-Wei Zhu 한국식품과학회 2015 Food Science and Biotechnology Vol.24 No.1

A novel polysaccharide (AGP-32) from the gonad of Haliotis discus hannai Ino was isolated using a protease-assisted process and successive ion-exchange and gel-filtration chromatography. The backbone of AGP-32 was determined using hydrolysis with trifluoroacetic acid. FTIR, NMR, and methylation analysis, and periodate oxidation and Smith degradation analysis revealed that the AGP-32 backbone mainly consisted of (1→6)-linked mannose, (1→3)-linked galactose, and (1→3)-linked glucose in a proportion of 2:3:1. An in vitro cell assay indicated that AGP-32 promoted mice splenic lymphocyte proliferation by 26% at a concentration of 50 μg/mL. AGP-32 had an effect on immune protection and is a candidate for consideration as a functional food.

Love Never Fades Away

Feng Jing 한국콘텐츠학회 2019 ICCC International Digital Design Invitation Exhib Vol.2019 No.12

Comparison of Anti-Inflammatory and Antinociceptive Effects of the Extracts from Mixed Agrimonia pilosa Ledeb and Salvia miltiorrhiza Bunge and of Perna canaliculus In Vivo and In Vitro

Jing Hui Feng,Seung Hwan Hwang,Youn Gil Kwak,Min-Jung Kim,Jeong Hun Jo,Soon Sung Lim,Hong Won Suh 한국식품영양과학회 2021 한국식품영양과학회 학술대회발표집 Vol.2021 No.10

Agrimonia pilosa Ledeb, as a traditional medicine, has been reported to be widely used on anti-inflammatory activity in many studies, as well as Salvia miltiorrhiza Bunge. Previously, we have reported that the mixture extract (ME) from Agrimonia pilosa Ledeb (AP) and Salvia miltiorrhiza Bunge (SM) could produce an antinociceptive effect in the gout arthritis model. Also, the Perna canaliculus extracts (PCE) has well-known anti-inflammatory and anti-arthritis effects. Then, in the present study, we aimed to investigate the potential anti-inflammatory and antinociceptive effects of the ME by using in vitro and in vivo models. At the same time, we project to compare with the PCE, which as a positive control. Results showed that both the once or continuously one-week treatment of the ME or the PCE reduced the pain threshold in a dose-dependent manner in the mono-iodoacetate (MIA)-induced arthritis model. However, we found that at the same dose of the ME and PCE, ME showed more and earlier effectiveness than the PCE. Both the ME and PCE also suppressed the plasma TNF-α, IL-6, and CRP expression in the MIA-induced arthritis model. Additionally, the release of nitric oxide (NO) and IL-6 were inhibited by the ME and the PCE in a dose-dependent manner in lipopolysaccharide (LPS)-stimulated RAW 264.7 cells. Moreover, TNF-α and MAPKs proteins expression were down-regulated by the ME and the PCE in LPS-stimulated RAW 264.7 cells. Furthermore, in the other in vivo assay, the change of ear weight in croton oil-induced ear edema model in mice was significantly reduced by treatment with the ME or the PCE at equally efficacy. Therefore, we suggest that the ME from AP and SM possesses anti-inflammatory and antinociceptive effects which indicate AP and SM could be a potential candidate for arthritis or ear edema treatment.

Influence of zircon on cristobalite crystallization of silicabased ceramic cores

Jing-jing Liang,Quan-hong Lin,Xuan Zhang,Tao Jin,Xiao-feng Sun,최백규,김인수,도정현,조창용 한양대학교 세라믹연구소 2016 Journal of Ceramic Processing Research Vol.17 No.8

Zircon is usually used as a main additive to silica-based ceramic core materials in precise investment casting in order toimprove their high temperature properties. But there is still a disagreement in its effect on crystallization behavior of fusedsilica. In this study, cristobalite crystallization of fused silica in three silica-based core materials containing 10, 30 and 50 wt%zircon respectively were investigated through X-ray diffraction (XRD) and scanning electron microscopy equipped with energydispersive spectrometer (SEM/EDS). Results showed that zircon addition had neglected effect on cristobalite crystallizationduring sintering at 1180 oC, 1200 oC, and 1220 oC, but could decrease crystallization during simulated casting process at1500 oC. It was suggested that diffusion of zirconium atoms played a crucial role in this suppressing behavior of zircon on thecristobalite crystallization. During cooling from 1500 oC, cristobalite transformation from β to α caused microcracks in thesesamples that containing 10% or 30% zircon. But when zircon content increased to 50%, crack was prevented. Less phasetransformation of fused silica → cristobalite and enhanced strength by zircon was supposed to be the reason that wasresponsible for prevented cracks.

Ferilnic Nirate Produces Delayed Preconditioning Against Myocardial Ischemia and Reperfusion Injury in Rats

Jing-feng Xu,Jin-ping Wang,Zhan-qing Wang 대한약학회 2010 Archives of Pharmacal Research Vol.33 No.6

To determine whether ferilnic nirate (FLNT) can precondition the rat heart against myocardial ischemia/reperfusion (I/R) damage and its mechanism, two groups of experiments were conducted. In the first group of experiments, rats were divided among four treatment groups: sham group; solvent with I/R (I/R control group); FLNT pretreatment with I/R (I/R FLNT group); and late ischemic preconditioning group (LPC group). In the second group of experiments without I/R, rats were divided into two treatment groups: control group and FLNT group. The results indicated that myocardial infarct size and the levels of creatine kinase and lactate dehydrogenase in the sera of the I/R FLNT group were significantly lower and the level of nitric oxide molecule and Mn-containing superoxide dismutase were significantly elevated in the heart tissue compared with I/R control group. The protein expression ratio of Bcl-2/Bax in heart tissue was significantly elevated in the I/R FLNT group. These results demonstrate FLNT is able to precondition rat hearts against myocardial ischemia/reperfusion damage to a similar level as that achieved via the late phase of ischemic preconditioning. The mechanism may involve the up-regulation of nitric oxide and the strengthening of anti-oxidant and anti-apoptosis cellular functions.