Interactions among Measles Virus Hemagglutinin, Fusion Protein and Cell Receptor Signaling Lymphocyte Activation Molecule (SLAM) Indicating a New Fusion-trimer Model

Peng Zhang,Ling Yun Li,Chun Lin Hu,Qin Xu,Xin Liu,Yi Peng Qi 한국생활환경학회 2005 BMB Reports Vol.38 No.4

Sequence Pulse Modulation for Voltage Balance in a Cascaded H-Bridge Rectifier

Peng, Xu,He, Xiaoqiong,Han, Pengcheng,Lin, Xiaolan,Shu, Zeliang,Gao, Shibin The Korean Institute of Power Electronics 2017 JOURNAL OF POWER ELECTRONICS Vol.17 No.3

With the development of multilevel converters, cascaded single-phase H-bridge rectifiers (CHBRs) has become widely adopted in high-voltage high-power applications. In this study, sequence pulse modulation (SPM) is proposed for CHBRs. SPM is designed to balance the dc-link voltage and maintain the smooth changes of switch states. In contrast to phase disposition modulation, SPM balances the dc-link voltage even after removing the load of one submodule. The operation principle of SPM is deduced, and the unbalance degree of SPM is analyzed. All the proposed approaches are experimentally verified through a prototype of a four-module (nine-level) CHBR. Conclusions are drawn in accordance with the results of SPM and its imbalance degree analysis.

Research on Peak-detection Algorithm for High-precision Demodulation System of Fiber Bragg Grating

Peng Wang,Xu Han,Simin Guan,Hong Zhao,Minglei Shao 보안공학연구지원센터 2014 International Journal of Hybrid Information Techno Vol.7 No.6

In order to improve the detection accuracy of wavelength, the filtering and curve fitting technologies were applied in the FBG wavelength demodulation system based on tunable F-P filter. These methods could realize the accurate peak-location of output signals of the photo detector. According to the characteristics of noise, the FIR low-pass filter was designed to filter the obtained light power signals so as to provide the input signals with high SNR for the peak-detection algorithms. By analyzing and comparing several typical peak-searching algorithms, the algorithm of Gauss formula nonlinear curve fitting (L-M) was chosen to fit the digitized light power signals. The experimental results show that L-M fitting algorithm reduces the mean square error by 7.5% compared with the Gauss fitting algorithm. For the Gauss signal in the wavelength demodulation system designed in the paper, the L-M algorithm has lower mean square error than other peak-searching algorithms. This algorithm is suitable for FBG wavelength demodulation system based on tunable F-P filter. It can efficiently raise the accuracy of wavelength demodulation system.

중국 전통 역사거리의 변천 및 경관관리 - 복주시(福州市) 삼방칠항(三坊七巷)을 대상으로 -

( Peng Hong-xu ),( Kang Tai-ho ) 한국전통조경학회(구 한국정원학회) 2017 Journal of Korean Institute of Traditional Landsca Vol.15 No.-

중국의 많은 역사지구는 수천년에 걸쳐 형성되었다. 역사 가구(街區)의 보존과 개발 간의 관계를 처리하기 위해서는 역사적인 ‘진실성’과 변화 과정에 대해 충분하고 완전한 이해가 필요하며 이를 바탕으로 적절한 경관관리계획을 수립할 수 있다. 복주 ‘삼방칠항(三坊七巷)’지구의 공간패턴은 당나라 후기 도시계획에 방리제를 도입하면서 시작되었으며 송·명 왕조시대를 거치면서 청나라 중기에 전성기를 이루었다. 이때부터 중정 형식의 전통주택과 ‘시란조(柴欄?)’목조 주택과 같은 독특한 주택이 나타날 뿐만 아니라 위대한 문화적 영향과 교육 제도를 완비하여 인재를 많이 배출하고 상업도 활발하게 이루어졌다. 그러나 1955년에서 21세기 초반까지 ‘삼방칠항’은 더 이상 발전하지 않았고 빈민가로 퇴락되었다. 2005년부터는 ‘삼방칠항’의 관리 전략을 ‘문화관광거리’ 모델에서 포괄적인 ‘커뮤니티 박물관’ 모델로 변경하면서 획기적인 변화를 모색하였지만 일부 문제는 여전히 존재하여 개선 방안이 필요하다. The formation of many historic districts in China could be traced back to millennia ago. To deal with the relationship between conservation and development of historical blocks, it is necessary to gain a full understanding of the “authenticity” and the change process of historic districts. On this basis, making appropriate landscape management decisions could be possible. The spatial pattern of Fuzhou “Three Lanes and Seven Alleys” district was established in the late Tang Dynasty by introducing Li-Fang system in city planning; after the accumulation in Song, Yuan and Ming Dynasties, this district reached the peak of development in the middle of Qing Dynasty. It was not only manifested in the emergence of characteristic dwellings, such as courtyard-style folk houses and the “Chai-lan-cuo” wooden house; but also in the great cultural influence, the formation of perfect education system, the talent people coming forth in large numbers and the prosperous commercial atmosphere. From 1955 to early twenty-first Century, “three lanes and Seven Alleys” were no longer brilliant, even once reduced to “shanty towns”. Since 2005, the management strategy of “San-fang Qi-xiang” have changed from one-side “Tourism Culture Street” model to a more comprehensive “community museum” model, but some problems still exist and need revamp.

The Role of Monoxide Hemoglobin in Color Improvement of Chicken Sausage

Peng Xu,Xuefeng Zhu,Shengjiang Tan,Hao Qin,Cunliu Zhou 한국식품과학회 2016 Food Science and Biotechnology Vol.25 No.2

The role of monoxide hemoglobin (COHb) in improvement of chicken sausage color was investigated. COHb and NaNO2 synergistically increased a* values. Addition of 0.1% COHb decreased the residual nitrite content in the presence of 0.001% NaNO2. Compared with controls, the combined treatment resulted in significantly higher nitroso pigment contents while the single treatment resulted in slightly higher nitroso pigment contents. Visible spectrometry indicated that both nitrosohemochrome (NH) and hematin were the main ingredients of pigments extracted from chicken sausage treated with a combination of 0.006% NaNO2 and 0.6% COHb. Formation of NH and hematin caused an increase in a* values and a decrease in L* values, respectively. COHb showed potential for use in meat product formulations.

Optimization of preventive maintenance of nuclear safety-class DCS based on reliability modeling

Peng Hao,Wang Yuanbing,Zhang Xu,Hu Qingren,Xu Biao 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.10

Nuclear safety-class DCS is used for nuclear reactor protection function, which is one of the key facilities to ensure nuclear power plant safety, the maintenance for DCS to keep system in a high reliability is significant. In this paper, Nuclear safety-class DCS system developed by the Nuclear Power Institute of China is investigated, the model of reliability estimation considering nuclear power plant emergency trip control process is carried out using Markov transfer process. According to the System-Subgroup-Module hierarchical iteration calculation, the evolution curve of failure probability is established, and the preventive maintenance optimization strategy is constructed combining reliability numerical calculation and periodic overhaul interval of nuclear power plant, which could provide a quantitative basis for the maintenance decision of DCS system

Effects of gradient on stress distribution in rotating functionally graded solid disks

Xu-Long Peng,Xian-Fang Li 대한기계학회 2012 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.26 No.5

"This paper presents the elastic analysis of a rotating sandwich solid disk composed of three-layered perfectly-bonded composites. The center and outer regions of the solid disk are two homogeneous isotropic media, and the middle region is a transition zone made of functionally graded materials (FGM). Two cases are considered. One is on FGM with power-law gradient. For this case, explicit expressions for full elastic fields are derived. The other is on FGM with any radial nonhomogeneity, for which an analytic approach is proposed to reduce the problem into a Fredholm integral equation. The validity of the latter method is ensured by comparing numerical results of the elastic fields with the exact ones for the case of power-law gradient. For a general case, the current study presents the influences of the gradient, width variation of the FGM, and rotational velocity on the distribution of the radial and hoop stresses for a rotating composite disk made of aluminum and zirconia. The method presented in this paper may help engineering designers in choosing appropriate gradients and materials to acquire the optimal state of a rotating functionally graded disk."

Cause analysis, prevention, and treatment of postoperative restlessness after general anesthesia in children with cleft palate

Xu, Hao,Mei, Xiao-Peng,Xu, Li-Xian The Korean Dental Society of Anesthsiology 2017 Journal of Dental Anesthesia and Pain Medicine Vol.17 No.1

Cleft palate is one of the most common congenital malformations of the oral and maxillofacial region, with an incidence rate of around 0.1%. Early surgical repair is the only method for treatment of a cleft lip and palate. However, because of the use of inhalation anesthesia in children and the physiological characteristics of the cleft palate itself combined with the particularities of cleft palate surgery, the incidence rate of postoperative emergence agitation (EA) in cleft palate surgery is significantly higher than in other types of interventions. The exact mechanism of EA is still unclear. Although restlessness after general anesthesia in children with cleft palate is self-limiting, its effects should be considered by clinicians. In this paper, the related literature on restlessness after surgery involving general anesthesia in recent years is summarized. This paper focuses on induction factors as well as prevention and treatment of postoperative restlessness in children with cleft palate after general anesthesia. The corresponding countermeasures to guide clinical practice are also presented in this paper.

Voltage balance evaluation strategy for DC-port faults in centralized aircraft ground power unit based on three-level neutral point clamped cascaded converter

Peng, Xu,Yu, Le,Gong, Kaiyue,Liu, Xiaohan,Yang, Guolong,Xu, Jiangjun,Zhou, Chao,Gao, Lixia,Zhu, Xinyu The Korean Institute of Power Electronics 2021 JOURNAL OF POWER ELECTRONICS Vol.21 No.8

An aircraft ground power unit (GPU) can replace the auxiliary power unit (APU) in an aircraft while the aircraft is parked at an airport. Therefore, the problems associated with the oil consumption and air pollution of the APU are solved. However, the GPU is faced with challenges in terms of utilization, power quality, and fault tolerance. Thus, a novel centralized aircraft GPU based on a three-level neutral point clamped cascaded converter (3LNPC-CC) is introduced in this paper to improve utilization and power quality. Furthermore, an evaluation voltage balance strategy is proposed for the DC-port fault tolerance of the 3LNPC-CC. In addition, both the modulation of the phase shift pulse width modulation (PSPWM) and the control of the double closed loop are used in the 3LNPC-CC. A simulation platform including the control, modulation, and fault tolerance of the system is established to verify the feasibility and performance of the proposed GPU. In particular, it is used to evaluate the voltage balance strategy for DC-port faults. Moreover, a prototype of the GPU and relevant experiments are completed to verify the correctness and feasibility of the system and the strategy.

Changes and Landscape Management of Chinese Historic Districts - A Case Study of “San-fang Qi-xiang”(Three Lanes and Seven Alleys), Fuzhou -

Peng Hong-xu,강태호 한국전통조경학회 2017 한국전통조경학회지 Vol.15 No.-

The formation of many historic districts in China could be traced back to millennia ago. To deal with the relationship between conservation and development of historical blocks, it is necessary to gain a full understanding of the “authenticity” and the change process of historic districts. On this basis, making appropriate landscape management decisions could be possible. The spatial pattern of Fuzhou “Three Lanes and Seven Alleys” district was established in the late Tang Dynasty by introducing Li-Fang system in city planning; after the accumulation in Song, Yuan and Ming Dynasties, this district reached the peak of development in the middle of Qing Dynasty. It was not only manifested in the emergence of characteristic dwellings, such as courtyard-style folk houses and the “Chai-lan-cuo” wooden house; but also in the great cultural influence, the formation of perfect education system, the talent people coming forth in large numbers and the prosperous commercial atmosphere. From 1955 to early twenty-first Century, “three lanes and Seven Alleys” were no longer brilliant, even once reduced to “shanty towns”. Since 2005, the management strategy of “San-fang Qi-xiang” have changed from one-side “Tourism Culture Street” model to a more comprehensive “community museum” model, but some problems still exist and need revamp.