http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
초발 정신분열병 환자의 정신병 비치료기간과 관련된 정신사회적 요인
박선철,김대호,남정현,이해원 大韓神經精神醫學會 2005 신경정신의학 Vol.44 No.4
Objectives : This study investigated the psychosocial factors and clinical symptoms related to the duration of untreated Psychosis (DUP) in 35 consecutive first-episode inpatients with schizophrenia. Mcthods : Data from 35 schizophrenic patients were obtained from two general psychiatric inpatient units at a university medical center. These data included scores from Index of Social Position (ISP), Positive and Negative Syndrome Scale (PANSS) and Symptom Checklist-90-Revised (SCL-90-R) as well as socio-demographic informations. Rcsults : Among socio-demographic variables, lower social position (r=.610, P<.001), male sex (r=.407, P=.015), and grew up in rural area (r=.335, p=.045) were significantly correlated with DUP. The interpersonal sensitivity of SCL-90-R was the only symptomatic variable significantly correlated with DUP (r=.379, P=.027). However, after controlling interactive effects of the variables, only lower social position and interpersonal sensitivity remained significant. Lower social position was more influential on DUP than interpersonal sensitivity in the multiple regression model. Conclusion : Both social and symptomatic factors independently influenced DUP in schizophrenic patients. Lower social position defined by education and occupation of patients or caretakers may reflect barriers to psychiatric services or poor identification of mental illness. This together with patients' subjective distress in interpersonal interactions may delay the intervention of psychiatric services.
Jung Haewon,Han Joo-Hwan,Jung In-Chul 한국세라믹학회 2024 한국세라믹학회지 Vol.61 No.4
With the recent increase in demand for electric vehicles, high-performance battery systems have also come under scrutiny. As the internal temperature of batteries rises, it can lead to product degradation, fire, and explosion issues. Therefore, to effectively dissipate internal heat, there is a demand for Thermal Interface Materials (TIMs) in the form of composite mate- rials, consisting of high-polymer materials and highly thermally conductive ceramic fillers. In this study, a silicone-based TIM containing high thermal conductivity fillers was prepared and investigated for various properties including thermal conductivity, density, and hardness. We prepared a TIM with a thermal conductivity of 7.4 W/m–K and a theoretical density of 3.27 g/cm 3 by filling 83 vol% of MgO fillers, surface-treated with a silane coupling agent, and Al 2O3 filler. As the content of ceramic fillers within the resin increased, the TIM's density also increased, forming internal thermal paths and enhancing thermal conductivity characteristics. Besides, as the hardness of TIM increased, reducing adhesion and resulting in increased thermal contact resistance, ultimately leading to a decrease in thermal conductivity. Using a Gap Filler-type TIM facilitates efficient heat transfer by minimizing thermal contact resistance. Based on these results, a low-density lightweight silicone-based TIM (gap filler) for electric vehicles is manufactured using hollow glass bubbles with a density of 0.38 g/cm 3 , achieving a thermal conductivity of 2.3 W/m–K and a density of 2.17 g/cm 3.
Jung, Haewon,Pham, Thanh-Truc,Shin, Eun Woo Elsevier 2018 APPLIED SURFACE SCIENCE - Vol.458 No.-
<P><B>Abstract</B></P> <P>In this study, C<SUB>3</SUB>N<SUB>4</SUB>/ZnO composite materials were prepared at various annealing temperatures and systematically characterized to investigate the role of ZnO in the thermal formation of graphitic C<SUB>3</SUB>N<SUB>4</SUB> (g-C<SUB>3</SUB>N<SUB>4</SUB>), and to understand effect of annealing temperatures on the interaction between g-C<SUB>3</SUB>N<SUB>4</SUB> and ZnO in the composite materials. ZnO nanoparticles in the composite materials facilitated the thermal formation of the g-C<SUB>3</SUB>N<SUB>4</SUB> structure due to the strong interaction between g-C<SUB>3</SUB>N<SUB>4</SUB> and ZnO nanoparticles, resulting in a decrease in thermal polymeric condensation temperatures. Moreover, the morphological structure of g-C<SUB>3</SUB>N<SUB>4</SUB> was significantly influenced by the presence of ZnO nanoparticles with an amorphous g-C<SUB>3</SUB>N<SUB>4</SUB> nanosheet structure in the composite materials and a crystalline interlayered g-C<SUB>3</SUB>N<SUB>4</SUB> structure in g-C<SUB>3</SUB>N<SUB>4</SUB> only. The higher annealing temperatures for composite materials induced the stronger interaction between ZnO nanoparticles and g-C<SUB>3</SUB>N<SUB>4</SUB> nanosheets. The strong interaction in a core-shell g-C<SUB>3</SUB>N<SUB>4</SUB>/ZnO structure not only gradually decreased the electronic density of ZnO nanoparticles but also proportionally inhibited the recombination of photo-generated electron-hole pairs in the composite materials, with increasing the annealing temperature. The g-C<SUB>3</SUB>N<SUB>4</SUB>/ZnO composite material prepared at 500 °C exhibited the highest photocatalytic reaction rate constant for photocatalytic degradation of methylene blue, which might be caused by the slowest recombination rate.</P> <P><B>Highlights</B></P> <P> <UL> <LI> g-C<SUB>3</SUB>N<SUB>4</SUB>/ZnO composite materials were prepared at various annealing temperatures. </LI> <LI> Non-crystalline g-C<SUB>3</SUB>N<SUB>4</SUB> nanosheets were formed from DCDA over ZnO nanoparticles. </LI> <LI> The strong interaction between ZnO and g-C<SUB>3</SUB>N<SUB>4</SUB> decreased the electron density of ZnO. </LI> <LI> The g-C<SUB>3</SUB>N<SUB>4</SUB>/ZnO composite prepared at 500 °C showed the slowest recombination rate. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Jung, Haewon,Pham, Thanh-Truc,Shin, Eun Woo Elsevier 2019 JOURNAL OF ALLOYS AND COMPOUNDS Vol.788 No.-
<P><B>Abstract</B></P> <P>In this study, g-C<SUB>3</SUB>N<SUB>4</SUB>/ZnO (CNZ) composite materials were synthesized through a one-step facile method with diverse precursors to investigate the interaction between g-C<SUB>3</SUB>N<SUB>4</SUB> precursors and ZnO and the resultant morphological structures. Thiourea (Thio), urea, and dicyandiamide (DCDA) were used as g-C<SUB>3</SUB>N<SUB>4</SUB> precursors. Several characterization methods were employed to understand the structural and optical properties affected by the interaction variation between g-C<SUB>3</SUB>N<SUB>4</SUB> and ZnO nanoparticles during the thermal polycondensation process to the g-C<SUB>3</SUB>N<SUB>4</SUB> structure. Consequently, each composite material resulted in different morphological composite structures. DCDA-CNZ formed a core–shell structure covered with thin g-C<SUB>3</SUB>N<SUB>4</SUB> layers due to an efficient interaction between DCDA and ZnO nanoparticles. Meanwhile, Thio and Urea-CNZ showed a segregated morphology of porous g-C<SUB>3</SUB>N<SUB>4</SUB> and ZnO nanoparticles in the composites, which was ascribed to a weak interaction between them and gas generation from thiourea and urea during the thermal polymerization. The core–shell morphology of DCDA–CNZ led to a unique behavior, such as the deficient electron density of Zn and g-C<SUB>3</SUB>N<SUB>4</SUB>-responded photoluminescence emission. Furthermore, DCDA–CNZ exhibited the highest efficiency for the photocatalytic degradation of methylene blue under visible-light irradiation, implying the strong influence of the morphological structure on the photocatalytic performance.</P> <P><B>Highlights</B></P> <P> <UL> <LI> g-C<SUB>3</SUB>N<SUB>4</SUB>/ZnO composites (CNZ) are prepared by a facile method with diverse precursors. </LI> <LI> Urea, thiourea (Thio) and dicyandiamide (DCDA) are utilized as a g-C<SUB>3</SUB>N<SUB>4</SUB> precursor. </LI> <LI> Segregated morphology in Urea and Thio-CNZ is caused by weak interaction with ZnO. </LI> <LI> DCDA-CNZ forms the core-shell structure by efficient interaction of g-C<SUB>3</SUB>N<SUB>4</SUB> with ZnO. </LI> <LI> The different morphologies in the CNZ composites influence photocatalytic activity. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Autofocusing Technique Based on Generalized Multilayer Stolt Migration
Jung, Haewon,Kim, Kangwook IEEE 2018 IEEE transactions on geoscience and remote sensing Vol.56 No.3
<P>A method is proposed for estimation of geometric information (GI) for obliquely layered geometry. The GI is estimated in the process of autofocusing (AF) of a ground-penetrating radar image. A novel AF technique is proposed based on the generalized multilayer Stolt migration algorithm. In the algorithm, the position and angle of the layer boundaries are determined using a Hough transform. At each layer, the AF metric is iteratively evaluated to estimate the relative permittivity (RP) of the layer. The performances of four AF metrics are compared, and an RP determination algorithm is suggested to reduce the number of AF metric evaluations. The proposed algorithm is validated with numerical and experimental data.</P>