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지역정보화 지수에 의한 지역개발연계효과 분석에 관한 연구
박재홍(JaeHong Park),박철수(Chul Soo Park),박완수(Wan Soo Park) 한국지역학회 1998 지역연구 Vol.14 No.1
The purpose of this paper is to present an informatization stratagem for a balanced development around the whole country by employing Regional Information Index. In order to demonstrate the region information level by applying the factor analysis in the study, it has been divided into three catagories, such as the generation of information, the distribution of information, and the consumption of information. According to the empirical analysis between 1985 and 1995, the regional differences of the levels of the consumption and the distribution of information have been reduced gradually. On the other hand, the generation of information is significantly concentrated around Seoul Metropolitan Area. Therefore, strategic efforts providing information infrastructures as well as introducing information industries associated with informatization will guarantee a balanced development around the country.
Park, Bo-Eun,Park, Jaehong,Lee, Sangyoon,Lee, Sanghun,Kim, Woo-Hee,Kim, Hyungjun Elsevier 2019 APPLIED SURFACE SCIENCE - Vol.480 No.-
<P><B>Abstract</B></P> <P>Tin oxide (SnO<SUB>x</SUB>) is a promising oxide semiconductor due to the distinct properties of n-type SnO<SUB>2</SUB> and p-type SnO based on its stoichiometry. However, the stoichiometry control of SnO<SUB>x</SUB> remains challenging due to the thermodynamic instability of SnO. In the study, we focus on establishing the controllable stoichiometry of SnO<SUB>x</SUB> via atomic layer deposition (ALD) and subsequent treatment. The controllable synthesis of SnO<SUB>2</SUB> and SnO is investigated by multiple analyses involving the chemical composition, crystal structure, and band structure. The ALD SnO<SUB>x</SUB> is composed mostly of Sn<SUP>4+</SUP> O bonds with intrinsic oxygen vacancies and is transformed into crystalline SnO<SUB>2</SUB> phase via post-annealing. The refractive index (~1.8) and optical bandgap energy (~3.6 eV) of ALD SnO<SUB>x</SUB> correspond to those of SnO<SUB>2</SUB>. Post-deposition treatment with H<SUB>2</SUB> plasma enables the effective transformation of SnO<SUB>2</SUB> into SnO due to the easy penetration of H<SUP>+</SUP> ion into the film and de-bonding of SnO via ion bombardment. The transformed SnO exhibits a significant amount of Sn<SUP>2+</SUP> O bonds with a refractive index of 2.8 and optical bandgap energy of ~2.9 eV. Specifically, the transformed SnO exhibits promise as an oxide semiconductor because it exhibits excellent stability with respect to re-oxidation into SnO<SUB>2</SUB> or further reduction into Sn metal. The present study advances practical applications that require a stable p-n junction through n-type SnO<SUB>2</SUB> and p-type SnO in various forms of device architectures.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Formation of SnO<SUB>2</SUB> and SnO was controlled by atomic layer deposition and post-process. </LI> <LI> Chemical composition, crystal structure, and band structure of SnO<SUB>x</SUB> were analyzed. </LI> <LI> As-deposited SnO<SUB>x</SUB> exhibits typical characteristics of SnO<SUB>2</SUB>. </LI> <LI> Post-deposition treatment with H<SUB>2</SUB> plasma effectively transforms SnO<SUB>2</SUB> into SnO. </LI> <LI> Transformed SnO is stable against re-oxidation or reduction during post-process. </LI> </UL> </P>
Low-energy spin dynamics of orthoferrites AFeO<sub>3</sub> (A = Y, La, Bi)
Park, Kisoo,Sim, Hasung,Leiner, Jonathan C,Yoshida, Yoshiyuki,Jeong, Jaehong,Yano, Shin-ichiro,Gardner, Jason,Bourges, Philippe,Klicpera, Milan,Sechovský,, Vladimí,r,Boehm, Martin,Park, Je IOP 2018 Journal of physics, an Institute of Physics journa Vol.30 No.23
<P>YFeO<SUB>3</SUB> and LaFeO<SUB>3</SUB> are members of the rare-earth orthoferrites family with <I>Pbnm</I> space group. Using inelastic neutron scattering, the low-energy spin excitations have been measured around the magnetic Brillouin zone center. Splitting of magnon branches and finite magnon gaps (∼2 meV) are observed for both compounds, where the Dzyaloshinsky–Moriya interactions account for most of this gap with some additional contribution from single-ion anisotropy. We also make comparisons with multiferroic BiFeO<SUB>3</SUB> (<I>R3c</I> space group), in which similar behavior was observed. By taking into account all relevant local Dzyaloshinsky–Moriya interactions, our analysis allows for the precise determination of all experimentally observed parameters in the spin-Hamiltonian. We find that different properties of the <I>Pbnm</I> and <I>R3c</I> space group lead to the stabilization of a spin cycloid structure in the latter case but not in the former, which explains the difference in the levels of complexity of magnon band structures for the respective compounds.</P>
JaeHong Park,YoungRong Bang,ChulKwon Kim 대한신경정신의학회 2014 PSYCHIATRY INVESTIGATION Vol.11 No.3
Objective-The aims of the present study are to investigate the rate of the psychiatric disorders in psychiatrically high-risk children and adolescents and to examine sex and age differences in the diagnosis of psychiatric disorders. Methods-The participants included students aged 6–16 from the 27 elementary and the 45 middle schools in Busan, Korea. We screened psychopathology using the Korean version of Child Behavior Checklist (K-CBCL) or the Youth Self Report (K-YSR). A total of 2,912 students were selected as high-risk students on the basis of cut-off scores (T-score ≥60) for a total behavior problem score of KCBCL/ K-YSR. Of these high-risk students, 1,985 students participated in and completed individual diagnostic interviews. Psychiatric diagnosis was assessed using a Korean version of the Kiddie-Schedule for Affective Disorders and Schizophrenia. Multivariate logistic regression analysis was conducted to examine sex and age differences of psychiatric diagnosis. Results-Based on sex, boys were more likely to have ADHD and girls were more likely to have depression. Based on age, children were more likely to have ADHD and adolescents were more likely to have affective disorder, conduct disorder, psychotic disorder, and anxiety disorders except separation anxiety disorder. Conclusion-This is the largest study to conduct face-to-face interviews with subjects and parent(s) among Korean studies in this field. The present study revealed significant differences across sex and age among specific psychiatric disorders in children and adolescents. Future population-based studies will be required to ascertain the sex- and age-related differences of psychiatric prevalence.
Synthesis of aerosol nanoparticles by spark discharge and applications
Jaehong Park,Jeong Hoon Byeon,Ki Young Yoon,Jae Hong Park,Jungho Hwang 한국입자에어로졸학회 2009 Particle and Aerosol Research Vol.5 No.3
activation with Pd and Pt aerosol nanoparticles produced by spark discharge was introduced. After annealing, the catalytically activated substrate placed into a solution for electroless silver deposition. The silver was then formed only on the activated regions of the substrate. Silver line patterns having a width of 18 μm and a height of 1 μm were created with the ability to be effectively reproduced. Antimicrobial nanoparticles such as silver were used for removal of bioaerosols. Silver nanoparticles deposited air filters such as ACF filters were evaluated by antimicrobial test.
Synthesis of aerosol nanoparticles by spark discharge and applications
Park, Jaehong,Byeon, Jeong Hoon,Yoon, Ki Young,Park, Jae Hong,Hwang, Jungho 한국입자에어로졸학회 2009 Particle and Aerosol Research Vol.5 No.3
This paper reviews about synthesis of nanoparticles by spark discharge and applications. A method of catalytic activation with Pd and Pt aerosol nanoparticles produced by spark discharge was introduced. After annealing, the catalytically activated substrate placed into a solution for electroless silver deposition. The silver was then formed only on the activated regions of the substrate. Silver line patterns having a width of $18{\mu}m$ and a height of $1{\mu}m$ were created with the ability to be effectively reproduced. Antimicrobial nanoparticles such as silver were used for removal of bioaerosols. Silver nanoparticles deposited air filters such as ACF filters were evaluated by antimicrobial test.