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Relationship between Self-Esteem and Self-Consciousness in Adolescents: An Eye-Tracking Study
Kim, Eun Seong,Hong, Yeon-Ju,Kim, Minwoo,Kim, Eun Joo,Kim, Jae-Jin Korean Neuropsychiatric Association 2019 PSYCHIATRY INVESTIGATION Vol.16 No.4
<P><B>Objective</B></P><P>Self-esteem and self-consciousness are important determinants of behaviors. This study aimed to explore the relationship between self-esteem and self-consciousness in adolescents using the eye-tracking measurement. </P><P><B>Methods</B></P><P>Fifty-five adolescents with high self-esteem and 58 adolescents with low self-esteem participated in self-consciousness-related eye-tracking experiments of selecting happy, disgusted, and angry facial emotions while recognizing one’s own usual expressions and the others’ usual expressions toward oneself. </P><P><B>Results</B></P><P>When recognizing one’s own, adolescents with high self-esteem showed significantly more selection counts and longer fixation time for ‘happy’ than adolescents with low self-esteem. When recognizing the others’, adolescents with low self-esteem showed significantly more selection counts and longer fixation time for ‘disgusted’ and ‘angry’ than adolescents with high self-esteem. </P><P><B>Conclusion</B></P><P>These suggest higher self-esteem is connected to more positive identification of one’s usual expressions and others’ usual expressions toward oneself. There is a close relationship among low self-esteem, suppressing positive emotions, decreased psychological adjustment, and increased negative emotions.</P>
Catalytically-etched hexagonal boron nitride flakes and their surface activity
Kim, Do-Hyun,Lee, Minwoo,Ye, Bora,Jang, Ho-Kyun,Kim, Gyu Tae,Lee, Dong-Jin,Kim, Eok-Soo,Kim, Hong Dae Elsevier 2017 APPLIED SURFACE SCIENCE - Vol.402 No.-
<P><B>Abstract</B></P> <P>Hexagonal boron nitride (h-BN) is a ceramic compound which is thermally stable up to 1000°C in air. Due to this, it is a very challenging task to etch h-BN under air atmosphere at low temperature. In this study, we report that h-BN flakes can be easily etched by oxidation at 350°C under air atmosphere in the presence of transition metal (TM) oxide. After selecting Co, Cu, and Zn elements as TM precursors, we simply oxidized h-BN sheets impregnated with the TM precursors at 350°C in air. As a result, microscopic analysis revealed that an etched structure was created on the surface of h-BN flakes regardless of catalyst type. And, X-ray diffraction patterns indicated that the air oxidation led to the formation of Co<SUB>3</SUB>O<SUB>4</SUB>, CuO, and ZnO from each precursor. Thermogravimetric analysis showed a gradual weight loss in the temperature range where the weight of h-BN flakes increased by air oxidation. As a result of etching, pore volume and pore area of h-BN flakes were increased after catalytic oxidation in all cases. In addition, the surface of h-BN flakes became highly active when the h-BN samples were etched by Co<SUB>3</SUB>O<SUB>4</SUB> and CuO catalysts. Based on these results, we report that h-BN flakes can be easily oxidized in the presence of a catalyst, resulting in an etched structure in the layered structure.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Hexagonal boron nitride flakes are etched at low temperature in air by catalysts. </LI> <LI> The presence of transition metal oxides produces an etched structure in the flakes. </LI> <LI> Etched surfaces become highly active due to vacancy defects formed in the flakes. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Exploiting Thread-Level Parallelism on HEVC by Employing a Reference Dependency Graph
Minwoo Kim,Deokho Kim,Kyungah Kim,Won Woo Ro Institute of Electrical and Electronics Engineers 2016 IEEE transactions on circuits and systems for vide Vol.26 No.4
<P>This paper presents an optimized parallel algorithm for the next-generation video codec High Efficiency Video Coding (HEVC). The proposed method provides maximized parallel scalability by exploiting two levels of parallelism: 1) frame level and 2) task level. Frame-level parallelism is exploited using a graph that efficiently provides a parallel coding order of the frames with complex reference dependencies. The proposed reference dependency graph is generated at runtime by a novel construction algorithm that dynamically analyzes the configuration of the HEVC codec. Task-level parallelism is exploited to provide further scalability to frame-level parallelization. A pipelined execution is allowed for independent tasks, which are defined by dividing and categorizing a single coding process into multiple types of tasks. The proposed parallel encoder and decoder do not suffer from loss in coding efficiency because neither constraints nor modification in coding options are required. The proposed parallel methods result in an average encoding speedup of 1.75 and the aggressive method that exploits additional frame-level parallelism achieved 6.52 speedup using eight physical cores.</P>
Kim Minwoo,Kim Jae Hyun,Park Wonhyoung,Park Jung Cheol,Ahn Jae Sung,Kwun Byung Duk,Lee Sung-Gyu,Hwang Shin,Kim Moinay,Lee Seungjoo 대한의학회 2024 Journal of Korean medical science Vol.39 No.9
Background: Liver transplantation (LT) patients appear to be more prone to neurological events compared to individuals undergoing other types of solid-organ transplantation. The aims of the present study were to analyze the prevalence of unruptured intracranial aneurysms (UIAs) in patients undergoing liver transplantation (LT) and to examine the perioperative occurrence of subarachnoid hemorrhage (SAH). Also, it intended to systematically identify the risk factors of SAH and hemorrhagic stroke (HS) within a year after LT and to develop a scoring system which involves distinct clinical features of LT patients. Methods: Patients who underwent LT from January 2012 to March 2022 were analyzed. All included patients underwent neurovascular imaging within 6 months before LT. We conducted an analysis of prevalence and radiological features of UIA and SAH. The clinical factors that may have an impact on HS within one year of LT were also reviewed. Results: Total of 3,487 patients were enrolled in our study after applying inclusion and exclusion criteria. The prevalence of UIA was 5.4%. The incidence of SAH and HS within one year following LT was 0.5% and 1.6%, respectively. We developed a scoring system based on multivariable analysis to predict the HS within 1-year after LT. The variables were a poor admission mental status, the diagnosis of UIA, serum ammonia levels, and Model for End-stage Liver Disease (MELD) scores. Our model showed good discrimination among the development (C index, 0.727; 95% confidence interval [CI], 0.635–0.820) and validation (C index, 0.719; 95% CI, 0.598–0.801) cohorts. Conclusion: The incidence of UIA and SAH was very low in LT patients. A poor admission mental status, diagnosis of UIA, serum ammonia levels, and MELD scores were significantly associated with the risk of HS within one year after LT. Our scoring system showed a good discrimination to predict the HS in LT patients.