Intersubband Transitions in Nonpolar GaN-based Resonant Phonon Depopulation Multiple-Quantum Wells for Terahertz Emissions

Ya-Feng Song,Xiong-Xiong Kong,Wei-Bin Tang,Zhong-Qiang Suo,Huan Zhang,Chen-Yang Li,Qian Jia,Cai-Xia Xue,Yan-Wu Lu,Chao-Pu Yang 한국물리학회 2019 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.74 No.11

We investigate the polarization effect in intersubband transitions in polar and nonpolar GaN-based multiple-quantum well (MQW) structures for terahertz (THz) emissions by using systematic comparisons and design a nonpolar GaN/Al$_{0.2}$Ga$_{0.8}$N two-well-based MQW structure with an emitting photon of 7.27 THz (30.07 meV). Its lower energy separation (92.7 meV) matches the resonant phonon depopulation condition for better population inversion. It shows a lower threshold current density $J\rm_{th}$ at all temperatures (1.548 kA/cm$^2$ at 90 K) and a higher output power of up to 86.1 mW at 5.8 K and 33.6 mW at 100 K. Our results for the polar GaN MQW are very close to the experimental data in the literature. We find that the $J\rm_{th}$ of the nonpolar GaN MQW increases more slowly than that of the polar GaN MQW as temperature increases, indicating the nonpolar GaN MQW may be a worth-trying direction for improving the operation temperature. These results can provide meaningful references for the design and fabrication of nonpolar GaN-based THz MQW or quantum cascade structures.

Preparation and Characterization of Inclusion Complex between β-Cyclodextrin and Polylactic Acid

Song Ya Nan,Zhou Yu Fang,Zhen Wei Jun 한국고분자학회 2015 폴리머 Vol.39 No.2

The inclusion complexes (ICs) between polylactic acid (PLA) and β-cyclodextrin (CD) were prepared by coprecipitation method in this work. The orthogonal experiments were designed to investigate the influence of different factors on the formation of inclusion complexes. The results suggested that the optimum scheme of inclusion compounds could be obtained when the feeding ratio of CD to PLA (wt%) was 20:1, stirring speed was 6 kr/min and the stirring time was 30 min. The structures and properties of the inclusion complexes were characterized by <SUP>1</SUP>H NMR, FTIR, DSC, FT-Raman, XRD and TGA. The DSC results demonstrated that the crystallization behavior of the inclusion complexes nearly disappeared. It was found that β-CD-PLA inclusion complex had a better thermal stability compared with the neat PLA. The model of the inclusion complexes was proposed on the basis of XRD, <SUP>1</SUP>H NMR and DSC results.

Breeding of New Rose Cultivar "Global Pink" with Pink Color Flower Resistance to the Powderly Mildew and High Productivity

Gwang Yeon Gi,Taek Sang Na,Ya Song Lee,Mi Hyang Jang,Kyung Cheuol Cho,In Taek Hwang,Joung Keun Kim,Hyung Ki Lim,Hong Jae Kim,Tae Ho Han 한국육종학회 2007 한국육종학회지 Vol.39 No.4

A new dark pink colored standard rose (Rosa hybrida Hort.) cultivar, 'Global Pink' was developed by the cross between 'Nobless' and 'Belami' at the Jeollanamdo Agricultural Research and Extention Services (JARES) through seedling and line selection in 2003 and characteristic evaluations during 2004~2006. 'Global Pink' showed Red purple group color (RHS No. 65B), very weak fragrance, and standard flower with good harmony between ray florlet and flower center. Its yield was 134 stems/m2 averaged over three years (2004-2007). It showed 10 days vase life and was resistant to powdery mildew. This cultivar was registered as a commercial cultivar in 2007. It can be cultured in greenhouses in Korea and will be released to the farmers in 2009.

제품다각화와 국제다각화가 기업성과에 미치는 영향 - 중국 상장기업을 중심으로-

송아남 ( Ya Nan Song ),오미단 ( Mei Dan Wu ),이재호 ( Jae Ho Lee ) 국제지역학회 2017 국제지역연구 Vol.21 No.1

지속적인 경쟁우위를 확보하기 위해 기업은 다각화 전략을 선택한다. 그러나 다각화 전략은 언제나 성공하는 것이 아니며, 다각화 전략의 종류, 수준에 따라 상이하다. 본 연구는 다각화 전략을 제품다각화 수준과 국제다각화 수준으로 구분하고 각각 기업경영성과에 미치는 영향을 분석하였다. 이를 위하여 중국 88개 상장기업을 대상으로 2008년부터 2013년까지의 재무데이터를 활용하였으며, 고정효과모형으로 실증분석을 하였다. 실증분석결과에 따르면 제품다각화 전략수준과 국제다각화 전략수준이 높으면 높을수록 다각화 당시의 기업 가치는 높아지지만, 수익성에는 영향을 미치지 않는 것으로 나타났다. 또한 다각화 전략이 이윤을 창출하기까지 시간이 필요한 것을 감안하여 다각화 전략이 1년 뒤의 수익성에 영향을 미치는 지를 살펴보았다. 그 결과, 제품다각화 수준은 여전히 기업 수익성에 영향을 주지 않는 것으로 나타났고, 국제다각화 수준은 기업의 수익성에 부의 영향을 미치는 것으로 나타났다. Diversification strategy is important for the enterprise which intends to expand its competitive advantage. However, it is not always a success because of its different form and level which brings us totally different results also. This study analysis the effect from diversification strategy on firm performance and we divided the diversification strategy into two different level: products diversification level and international diversification level. We select financial data from 88 China listed enterprises during the year from 2008-2013 and use fixed effect model to do the analysis. According to the result, there is a positive effect between diversification strategy and firm value. A company which has the higher products diversification level and international diversification level will more possibly achieve success in diversification strategy. However, there is no significant effect on firm`s profit. Considering the time effect of profit, we used after 1 year profit data and find that the enterprise which has a higher level of international diversification will have less profit, but there is also no significant effect between product diversification and firm`s profit.

Interaction of Heliothis armigera Nuclear Polyhedrosis Viral Capsid Protein with its Host Actin

Lu, Song-Ya,Qi, Yi-Peng,Ge, Guo-Qiong 생화학분자생물학회 2002 Journal of biochemistry and molecular biology Vol.35 No.6

In order to find the cellular interaction factors of the Heliothis armigera nuclear polyhedrosis virus capsid protein VP39, a Heliothis armigera cell cDNA library was constructed. Then VP39 was used as bait. The host actin gene was isolated from the cDNA library with the yeast two-hybrid system. This demonstrated that VP39 could interact with its host actin in yeast. In order to corroborate this interaction in vivo, the vp39 gene was fused with the green fluorescent protein gene in plasmid pEGFP39. The fusion protein was expressed in the Hz-AM1 cells under the control of the Autographa californica multiple nucleopolyhedrovirus immediate early gene promoter. The host actin was labeled specifically by the red fluorescence substance, tetramethy rhodamine isothicyanete-phalloidin. Observation under a fluorescence microscopy showed that VP39, which was indicated by green fluorescence, began to appear in the cells 6 h after being transfected with pEGFP39. Red actin cables were also formed in the cytoplasm at the same time. Actin was aggregated in the nucleus 9 h after the transfection. The green and red fluorescence always appeared in the same location of the cells, which demonstrated that VP39 could combine with the host actin. Such a combination would result in the actin skeleton rearrangement.

Evidence for the Presence of Long-Lived Plasma Cells in Nasal Polyps

Ya-Na Zhang,Jia Song,Guan-Ting Zhai,Hai Wang,Ren-Zhong Luo,Jing-Xian Li,Bo Liao,Jin Ma,Heng Wang,Xiang Lu,Da-Bo Liu,Zheng Liu 대한천식알레르기학회 2020 Allergy, Asthma & Immunology Research Vol.12 No.2

Purpose: Plasma cells and immunoglobulins (Igs) play a pivotal role in the induction and maintenance of chronic inflammation in nasal polyps. During secondary immune responses, plasma cell survival and Ig production are regulated by the local environment. The purpose of the present study was to investigate the presence of long-lived plasma cells (LLPCs) and specific survival niches for LLPCs in human nasal polyps. Methods: Nasal mucosal samples were cultured with an air-liquid interface system and the Ig levels in culture supernatants were analyzed by enzyme-linked immunosorbent assay. The characteristics of LLPCs in nasal polyps were determined by immunohistochemistry and immunofluorescence. The expression of neurotrophins as well as their receptors was detected by quantitative real-time polymerase chain reaction, immunohistochemistry, immunofluorescence, and Western blotting. Results: The numbers of CD138+ total plasma cells and BCL2+ plasma cells were increased in both eosinophilic and non-eosinophilic nasal polyps compared with those in normal tissues. The production of IgG, IgA, and IgE was detected in culture supernatants even after a 32-day culture of nasal polyps. Although the total numbers of plasma cells were decreased in nasal polyps after culture, the numbers of BCL2+ plasma cells remained stable. The expression of nerve growth factor (NGF) as well as tropomyosin receptor kinase (Trk) A, a high-affinity receptor for NGF, was upregulated in both eosinophilic and non-eosinophilic nasal polyps. In addition, BCL2+ plasma cell numbers were positively correlated with NGF and TrkA mRNA expression in nasal mucosal tissues. Polyp plasma cells had the expression of TrkA. Conclusions: Human nasal polyps harbor a population of LLPCs and NGF may be involved in their prolonged survival. LLPCs may be a novel therapeutic target for suppressing the local Ig production in nasal polyps.

Disaster Nursing Knowledge, Disaster Preparedness Attitudes, and Disaster Nursing Competency of Nursing Students

Song, Eun Ju,Yang, Ya Ki 한국간호과학회 2019 한국간호과학회 학술대회 Vol.2019 No.10

filtering for stochastic systems driven by Poisson processes

Song, Bo,Wu, Zheng-Guang,Park, Ju H.,Shi, Guodong,Zhang, Ya Taylor and Francis 2015 International Journal of Control Vol. No.

Quantum secure direct communication via tripartite entanglement and local operation

Ya Hong Wang,He San Song,Hong Wei Liaong 한국멀티미디어학회 2006 한국멀티미디어학회 국제학술대회 Vol.2006 No.-

A protocol is proposed to fulfill quantum secure direct communication via swapping entanglement and local operation. Based on the scheme, we discuss something about the utilization of resource and the security of communication. We find that it is absolutely secure to transmit classical information using the scheme proposed. But the average amount of information loaded by each qubit is invariable, although the qubits' amount belonged to a maximally entanglement state is different. By using this scheme can we also improve the communicating efficiency.

An Investigation Into the Relationship Between Metabolic Responses and Energy Regulation in Antibody-Producing Cell

Ya Ting Sun,Liang Zhao,Zhao Yang Ye,Li Fan,Xu Ping Liu,Wen Song Tan 한국미생물생명공학회(구 한국산업미생물학회) 2013 Journal of microbiology and biotechnology Vol.23 No.11

Energy-efficient metabolic responses were often noted in high-productive cultures. To better understand these metabolic responses, an investigation into the relationship between metabolic responses and energy regulation was conducted via a comparative analysis among cultures with different energy source supplies. Both glycolysis and glutaminolysis were studied through the kinetic analyses of major extracellular metabolites concerning the fast and slow cell growth stages, respectively, as well as the time-course profiles of intracellular metabolites. In three cultures showing distinct antibody productivities, the amino acid metabolism and energy state were further examined. Both the transition of lactate from production to consumption and steady intracellular pools of pyruvate and lactate were observed to be correlated with efficient energy regulation. In addition, an efficient utilization of amino acids as the replenishment for the TCA cycle was also found in the cultures with upregulated energy metabolism. It was further revealed that the inefficient energy regulation would cause low cell productivity based on the comparative analysis of cell growth and productivity in cultures having distinct energy regulation.