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Weiyan Liu,Huiming Ji,Jian Wang,Xuerong Zheng,Junyun Lai,Junna Ji,Tongfei Li,Yuanliang Ma,Haiqin Li,Suqin Zhao,Zhengguo Jin 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2015 NANO Vol.10 No.3
"Uniform hexagonal covellite CuS thin films were deposited at room temperature by an in situ solution chemical reaction using copper precursor solid films as cationic source and ammonium sulfide ethanol solution as anionic reaction medium. We investigated the influence of both ethanolamine and butanol contents used in copper nitrate/ethylene glycol monomethylether (EGME) cationic solution for the preparation of copper precursor solid films, deposition cycle numbers and annealing treatment of the as-grown thin films by X-ray diffraction (XRD), FESEM, energy dispersive X-ray fluorescence EDX, transmission electron microscopy–Selected area electronic diffraction (TEM–SAED), atomic force microscopy (AFM) and ultraviolet-visible-near-infrared (UV-Vis–NIR) measurements. Photo-response of the CuS thin films was characterized by linear sweep voltammetry. The deposited CuS thin films were used to sensitize TiO2 anodes for solar cell application. The results showed that the CuS films had two-dimension oriented, half-sheet shaped growing morphology standing disorderly but vertically to substrates, and the calculated texture coefficient TC(102) verified that the half-sheet shaped crystallites had (102) plane orientation. This in situ multi-deposition process had an average deposited rate of 9 nm per cycle, and a selfperfect function to grow smooth, uniform and 2D oriented morphology with increase in the dip-cycle numbers. The photocurrent density was 14.5 Ma/cm2 at 1 V versus Ag/AgCl electrode for the annealed CuS thin films. CuS-sensitized TiO2 solar cells had a maximum conversion efficiency of 0.224%."
쌓기 활동에서 유아들의 친 사회적 행동 출현에 대한 맥락적 이해
박화윤,마지순,최재숙 한국영유아보육학회 2002 한국영유아보육학 Vol.0 No.31
The purpose of this ethnographic study is to explore the emergent context of prosocial behavior and to find the children's character promoting of prosocial that within the area of block. The result are as follows: 1) It appeared that emergent context of prosocial; behavior is completion of structures, participation of symbolic play using them and clean-up. 2) It appeared that children's character promoting prosocial behavior that appearence of altruism by children's perspective-taking, exchage of idea and problem-solving.
LED 면광원의 균일한 조도 분포를 갖는 Pattern 설계
김지혜(KIM Ji-hye),허지민(HEO Ji-min),이지훈(LEE Ji-hoon),유한제(YU Han-jae),마성민(MA Seong-min),지현수(JI Hyun-su),정미숙(JEONG Mee-suk) 한국생산제조학회 2011 한국생산제조시스템학회 학술발표대회 논문집 Vol.2011 No.4
This study is about a pattern design on LGP(Light Guide Panel). Using an LED, there is 2 kinds of system to make FFL. One of the systems is direct type which arranges an LED in a PCB substrate. Direct type has higher Light efficiency and more uniformity of illumination distribution then other system, but direct type has dazzling and a problem in a hot spot. To reduce such problems, This paper studied method to put pattern in a LGP upper part.
Ma, Ji-Yong,Yan, Hai-Jun,Yang, Zhen-Hua,Gu, Wei Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.5
MicroRNA-27a (miR-27a) is deemed to be an oncogene that plays an important role in development of various cancers, and single nucleotide polymorphism (SNP) of miR-27a can influence the maturation or aberrant expression of hsa-miR27a, resulting in increased risk of cancer and poor prognosis for non-small cell lung cancer (NSCLC). This study aimed to assess the effects of rs895819 within miR-27a on susceptibility and prognosis of NSCLC patients in 560 clinical confirmed cases and 568 healthy check-up individuals. Adjusted odds/hazard ratios (ORs/HRs) and 95% confidential intervals (CIs) were calculated to evaluate the association between rs895819 and the risk and prognosis of NSCLC. The results showed that allele A and genotype GG of rs895819 were significantly associated with an increased risk of NSCLC (38.9% vs 30.8%, adjusted OR=1.26, 95%CI=1.23-1.29 for allele G vs A; 18.1% vs 11.7%, adjusted OR=1.67, 95%CI=1.59-1.75 for genotype GG vs AA). Moreover, positive associations were also observed in dominant and recessive models (53.7% vs 49.9%, adjusted OR=1.17, 95%CI=1.13-1.20 for GG/AG vs AA; 18.1% vs 11.7%, adjusted=1.65, 95%CI=1.58-1.73). However, no significant association was found between rs895819 and the prognosis of NSCLC in genotype, dominant and recessive models. These results suggested that miR-27a might be involved in NSCLC carcinogenesis, but not in progression of NSCLC. The allele G, genotype GG and allele G carrier (GG/AG vs AA) of rs895819 might be genetic susceptible factors for NSCLC. Further multi-central, large sample size and well-designed prospective studies as well as functional studies are warranted to verify our findings.
Prevention of DDoS Attacks for Enterprise Network Based on Traceback and Network Traffic Analysis
Ma, Yun-Ji,Baek, Hyun-Chul,Kim, Chang-Geun,Kim, Sang-Bok The Korea Institute of Information and Commucation 2009 Journal of information and communication convergen Vol.7 No.2
With the wide usage of internet in many fields, networks are being exposed to many security threats, such as DDoS attack and worm/virus. For enterprise network, prevention failure of network security causes the revealing of commercial information or interruption of network services. In this paper, we propose a method of prevention of DDoS attacks for enterprise network based on traceback and network traffic analysis. The model of traceback implements the detection of IP spoofing attacks by the cooperation of trusted adjacent host, and the method of network traffic analysis implements the detection of DDoS attacks by analyzing the traffic characteristic. Moreover, we present the result of the experiments, and compare the method with other methods. The result demonstrates that the method can effectively detect and block DDoS attacks and IP spoofing attacks.
CTCF is required for maintenance of auditory hair cells and hearing function in the mouse cochlea
Ma, Ji-Hyun,Kim, Hyoung-Pyo,Bok, Jinwoong,Shin, Jeong-Oh Elsevier 2018 Biochemical and biophysical research communication Vol.503 No.4
<P><B>Abstract</B></P> <P>Auditory hair cells play an essential role in hearing. These cells convert sound waves, mechanical stimuli, into electrical signals that are conveyed to the brain via spiral ganglion neurons. The hair cells are located in the organ of Corti within the cochlea. They assemble in a special arrangement with three rows of outer hair cells and one row of inner hair cells. The proper differentiation and preservation of auditory hair cells are essential for acquiring and maintaining hearing function, respectively. Many genetic regulatory mechanisms underlying hair-cell differentiation and maintenance have been elucidated to date. However, the role of epigenetic regulation in hair-cell differentiation and maintenance has not been definitively demonstrated. CTCF is an essential epigenetic component that plays a primary role in the organization of global chromatin architecture. To determine the role of CTCF in mammalian hair cells, we specifically deleted <I>Ctcf</I> in developing hair cells by crossing <I>Ctcf</I> <SUP> <I>fl/fl</I> </SUP> mice with <I>Gfi1</I> <SUP> <I>Cre/+</I> </SUP> mice. <I>Gfi1</I> <SUP> <I>Cre</I> </SUP> <I>; Ctcf</I> <SUP> <I>fl/fl</I> </SUP> mice did not exhibit obvious developmental defects in hair cells until postnatal day 8. However, at 3 weeks, the <I>Ctcf</I> deficiency caused intermittent degeneration of the stereociliary bundles of outer hair cells, resulting in profound hearing impairment. At 5 weeks, most hair cells were degenerated in <I>Gfi1</I> <SUP> <I>Cre</I> </SUP> <I>; Ctcf</I> <SUP> <I>fl/fl</I> </SUP> mice, and defects in other structures of the organ of Corti, such as the tunnel of Corti and Nuel's space, became apparent. These results suggest that CTCF plays an essential role in maintaining hair cells and hearing function in mammalian cochlea.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Construction of hyper baculovirus expression vector by the optimization of enhancer factors
Ji Hoon Lee,Won Seok Gwak,Ji In Ma,Hwi Geon Yun,Dong Jun Kim,Soo Dong Woo 한국응용곤충학회 2017 한국응용곤충학회 학술대회논문집 Vol.2017 No.10
The baculovirus expression vector system (BEVS) is an effective and widely used system for the production of recombinantproteins in insect cells or larvae. However, the expression efficiency of recombinant proteins using the polyhedrin promotercould not acquire the protein yields observed for native polyhedrin. In this study, we tried to develop hyper expressionvector by the optimal combination of previously reported various enhancer factors. The selected enhancer factors for optimalexpression consists homologous region5 (hr5), VP39 promoter and burst sequences. Seven recombinant viruses were madeto compare EGFP expression level. Each recombinant viruses showed different expression levels respectively, and themost of expression level was observed with higher than those of the previous vectors. This study suggests a new optionfor hyper expression of useful recombinant protein using the BEVS.