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Design of 1500V solar inverter stack beyond megawatt in NPC1 topology
Xin Hao,Kwok-Wai Ma,Jia Zhao,Xin-Yu Sun 전력전자학회 2017 전력전자학술대회 논문집 Vol.2017 No.7
This paper describes a design concept of NPC1 power stack for 1500VDC megawatt level solar inverter. This stack uses three latest half-bridge IGBT modules with highest power density and operation junction temperature, which enable realization of power level beyond 1MW without paralleling. Critical design concept on loop inductance is explained. Dynamic characteristics are verified by double-pulse test. Thermal characteristics and output power limits are verified by thermal test. Temperature-sensitive component on PCB as output power constraint is identified. Different PCB repositioning solutions are tested to give the overall output power thermal derating curves, which enable output power of 1.15MW at TA=55°C with 15°C thermal margin. The power stack characteristic and performance change under different thermal environment is further analyzed.
Xinhao Yan,이고은,노경탁,이현진,김학원,이규형,허남회,이병노,박영준 대한화학회 2017 Bulletin of the Korean Chemical Society Vol.38 No.7
2,5-Disubstituted-1,3,4-oxadiazoles are prepared in excellent yields (up to 97%) under totally solvent-free conditions by the quantitative formation of N-acylhydrazone from the reaction of a hydrazide with an aldehyde using a ball-mill for 10 min at room temperature followed by oxidation with BTI at 80°C for 1h.
Low-Affinity Zinc Sensor Showing Fluorescence Responses with Minimal Artifacts
Yan, Xinhao,Kim, Jin Ju,Jeong, Hye Sun,Moon, Yu Kyung,Cho, Yoon Kyung,Ahn, Soyeon,Jun, Sang Beom,Kim, Hakwon,You, Youngmin American Chemical Society 2017 Inorganic Chemistry Vol.56 No.8
<P>The study of the zinc biology requires molecular probes with proper zinc affinity. We developed a low-affinity zinc probe (HBO-ACR) based on an azacrown ether (ACR) and an 2-(2-hydroxyphenyl)benzoxazole (HBO) fluorophore. This probe design imposed positive charge in the vicinity of a zinc coordination center, which enabled fluorescence turn-on responses to high levels of zinc without being affected by the pH and the presence of other transition metal ions. Steady-state and transient photophysical investigations suggested that such a high tolerance benefits from orchestrated actions of proton-induced nonradiative and zinc-induced radiative control. The zinc bioimaging utility of HBO-ACR has been fully demonstrated with the use of human pancreas epidermoid carcinoma, PANC-1 cells, and rodent hippocampal neurons from cultures and acute brain slices. The results obtained through our studies established the validity of incorporating positively charged ionophores for the creation of low-affinity probes for the visualization of biometals.</P>
Computer Network Vulnerability Assessment and Safety Evaluation Application based on Bayesian Theory
Liang Huang,Xinhao Chen,Xinsheng Lai 보안공학연구지원센터 2016 International Journal of Security and Its Applicat Vol.10 No.12
Computer network vulnerability analysis is a method of analysis and evaluation of network security beforehand. The attacks method has occurred in the network, the previous network status change as input information, calculated by the model analysis. Forecasting network node may be network attacks given the current security level value network, network security reinforcement measures taken before the danger. Administrators can proactively identify network security issues, to take measures in advance to avoid information leakage, financial losses, ensure the safety of individuals and countries. Therefore, vulnerability analysis computer network is very important. Based on the properties of attack graph shows the method of attack graphs to Bayesian network transformation, using the new algorithm to eliminate loops attribute attack graph optimization, building the Bayesian attribute attack graph model used to evaluate the network itself security situation. In this model, based on Bayes formula for calculating the probability of a new node probability calculation formula and attack paths occur for calculating network vulnerability assessment of the quantitative indicators. The model not only can visually process description of cyber attacks, but also into the Bayesian network probabilistic thinking of possible network attack path prediction and assessment.
Breastfeeding Supports for Two-Child Professional Women
Zhuoyan Mao,Xinhao Lin,Xiujun Tai,Jun Wang 숙명여자대학교 아시아여성연구원 2018 Asian Women Vol.34 No.2
How to create a balance between family and career is always a serious decision for professional women. The implementation of China’s universal two-child policy has reheated this discussion. Breastfeeding, as one of the instincts of human reproduction, has become the first barrier for professional women to return to work. Using the Beijing two-child women’s maternity survey data, this paper analyzes how social supports influence the weaning time of two-child professional women, and tries to provide a practical and theoretical basis for the establishment of a family friendly social environment after the implementation of the universal two-child policy. Results show that most two-child mothers weaned much earlier than suggested, and this is even more acute among professional women. Setting up breastfeeding rooms at the workplace and popularizing scientific breastfeeding knowledge can reduce the risk of premature weaning among professional women. However, the emotional support of friends and relatives may be “meaningful but misguided,” leading to premature weaning.
Huang, Xi,Ouyang, Xinhao,Yang, Panyu,Lau, On Sun,Chen, Liangbi,Wei, Ning,Deng, Xing Wang National Academy of Sciences 2013 PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF Vol.110 No.41
<P>The evolutionarily conserved CONSTITUTIVE PHOTOMORPHOGENESIS 1 (COP1) is a RING and WD40 protein that functions as a substrate receptor of CULLIN4–DAMAGED DNA BINDING PROTEIN 1 (CUL4–DDB1)–based E3 ubiquitin ligases in both plants and animals. In <I>Arabidopsis</I>, COP1 is a central repressor of photomorphogenesis in the form of COP1–SUPPRESSOR OF PHYA (SPA) complex(es). CUL4–DDB1–COP1–SPA suppresses the photomorphogenic program by targeting the transcription factor ELONGATED HYPOCOTYL 5 for degradation. Intriguingly, under photomorphogenic UV-B light, COP1 reverses its repressive role and promotes photomorphogenesis. However, the mechanism by which COP1 is functionally switched is still obscure. Here, we demonstrate that UV-B triggers the physical and functional disassociation of the COP1–SPA core complex(es) from CUL4–DDB1 and the formation of a unique complex(es) containing the UV-B receptor UV RESISTANCE LOCUS 8 (UVR8). The establishment of this UV-B–dependent COP1 complex(es) is associated with its positive modulation of ELONGATED HYPOCOTYL 5 stability and activity, which sheds light on the mechanism of COP1’s promotive action in UV-B–induced photomorphogenesis.</P>