Journal of the Korean Physical Society最新文献_第4页

Exploring the effect of Ba2+ ions doping on the dielectric properties of SrSnO3 ceramics 探讨Ba2+离子掺杂对SrSnO3陶瓷介电性能的影响

IF 0.8 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2024-11-21 DOI: 10.1007/s40042-024-01223-3

Depeng Wang, Ziheng Huang, Wei Li, Xiaoyu Wu, Weitian Wang

引用次数: 0

Correlation between the gain factor of a reflective polarizer and the optical structure of quantum dot-based backlights for LCD applications 液晶显示用量子点背光的光学结构与反射偏振器增益因子的关系

IF 0.8 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2024-11-20 DOI: 10.1007/s40042-024-01164-x

Sang-min Lee, Hyeon-Ho Choo, Jun-Hyeok Jang, Min-Jun Kwak, Eunki Baek, Sohee Kim, Jae-Hyeon Ko

{"title":"Correlation between the gain factor of a reflective polarizer and the optical structure of quantum dot-based backlights for LCD applications","authors":"Sang-min Lee, Hyeon-Ho Choo, Jun-Hyeok Jang, Min-Jun Kwak, Eunki Baek, Sohee Kim, Jae-Hyeon Ko","doi":"10.1007/s40042-024-01164-x","DOIUrl":"10.1007/s40042-024-01164-x","url":null,"abstract":"<div>The optical gain factor of a reflective polarizer in a quantum dot (QD)-based edge-lit backlight was investigated for the first time with various optical film combinations. The QD film, containing red and green quantum dots, was excited by 20 blue LEDs arranged near the light guide plate (LGP). The multilayer-type reflective polarizer significantly altered the color properties of the QD backlight by enhancing QD film excitation through its reflective properties. The gain factor was nearly two when only a single QD film was placed over the LGP without additional optical films, indicating minimal optical loss. However, the gain factor decreased significantly with the addition of prism sheets, likely due to the formation of a strong optical cavity between the bottom reflector and the prism grooves. This suggests that the optical configuration of QD-based backlights should be carefully optimized to account for color changes due to the reflective polarizer and to avoid strong optical cavity effects caused by prism sheets.</div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"85 11","pages":"915 - 922"},"PeriodicalIF":0.8,"publicationDate":"2024-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142761865","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Systematic investigation of nanofluids: impact of nanoparticle charge and temperature on thermophysical properties 纳米流体的系统研究：纳米粒子电荷和温度对热物理性质的影响

IF 0.8 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2024-11-12 DOI: 10.1007/s40042-024-01225-1

Taeil Yi

{"title":"Systematic investigation of nanofluids: impact of nanoparticle charge and temperature on thermophysical properties","authors":"Taeil Yi","doi":"10.1007/s40042-024-01225-1","DOIUrl":"10.1007/s40042-024-01225-1","url":null,"abstract":"<div>This study systematically investigates the effects of nanoparticle (NP) charge and temperature on the thermophysical properties of nanofluids using molecular dynamics simulations. The interaction between charged nanoparticles and solvent particles significantly influences both viscosity and thermal conductivity. The nanoparticles are modeled with varying charges, and their impact on fluid behavior is analyzed in terms of radial distribution functions, viscosity, and thermal conductivity, computed using the Green-Kubo formalism. The findings reveal that increased NP charge leads to reduced aggregation, enhancing dispersion and lowering viscosity, while thermal conductivity exhibits complex behavior, decreasing with NP charge at moderate temperatures but increasing in the supercritical region. Temperature also plays a critical role, with nanofluids demonstrating typical shear-thinning behavior and a distinct phase-dependent response in thermal conductivity. These results provide valuable insights into optimizing nanofluid properties for applications such as coolant systems and lubricants, where both efficient heat transfer and low energy dissipation are crucial. The systematic analysis of charge and temperature effects contributes to a better understanding of the underlying mechanisms governing nanofluid behavior.</div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"85 12","pages":"1041 - 1049"},"PeriodicalIF":0.8,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142826237","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Ensemble-based community detection for dynamic networks 基于集成的动态网络团体检测

IF 0.8 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2024-11-12 DOI: 10.1007/s40042-024-01224-2

Jiyoung Kang

{"title":"Ensemble-based community detection for dynamic networks","authors":"Jiyoung Kang","doi":"10.1007/s40042-024-01224-2","DOIUrl":"10.1007/s40042-024-01224-2","url":null,"abstract":"<div>Community detection is crucial for understanding complex systems in network science. However, traditional methods often face practical issues due to the variability of the results influenced by resolution parameters. Ensemble-based community detection techniques have been proposed to address this problem by aggregating results from multiple analyses to enhance reliability, and suggested global and local metrics for robust community detection. In this study, we explore the applicability of these ensemble-based techniques to dynamic networks by applying them to simulated networks with evolving community structures. Using the partition inconsistency measure, a global metric assessing overall structural stability, we identified time points where stable community configurations changed. Furthermore, by analyzing the trajectories of membership inconsistency, a local metric quantifying node-level assignment community consistency, we detected nodes that were initially affected by dynamic changes in community structure. These findings demonstrate that ensemble-based community detection methods are effective tools for analyzing dynamic networks. This method has the potential to enhance our understanding of temporal dynamics in complex networks and aid in predicting future states across various domains.</div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"86 1","pages":"14 - 22"},"PeriodicalIF":0.8,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142939316","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Nanoscale recessed T-gated ScAlN/GaN-HEMT on SiC wafer with graded back-barrier and Fe-doped buffer for future RF power amplifiers: a simulation study 基于梯度后势垒和掺铁缓冲的纳米t -门控ScAlN/GaN-HEMT用于未来射频功率放大器的仿真研究

IF 0.8 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2024-11-12 DOI: 10.1007/s40042-024-01222-4

B. Mounika, J. Ajayan, Asisa Kumar Panigrahy, Raghunandan Swain, S. Sreejith

{"title":"Nanoscale recessed T-gated ScAlN/GaN-HEMT on SiC wafer with graded back-barrier and Fe-doped buffer for future RF power amplifiers: a simulation study","authors":"B. Mounika, J. Ajayan, Asisa Kumar Panigrahy, Raghunandan Swain, S. Sreejith","doi":"10.1007/s40042-024-01222-4","DOIUrl":"10.1007/s40042-024-01222-4","url":null,"abstract":"<div>ScAlN, with its ultra-wide band gap and ferroelectric properties, offers promising enhancements for GaN-HEMTs expanding the device-application space. In this work, we report the DC/RF characteristics of lattice-matched Sc0.18Al0.82N/GaN-HEMT (SG-HEMT) built on SiC wafer. The SG-HEMT features a graded AlGaN back-barrier (g-AlGaN BB) that enhances the conduction-band (CB) disruption at the AlGaN/GaN interface, improving charge confinement. We examine the impact of Sc0.18Al0.82N barrier thickness (TB) and gate-recess height (TR) on device performance. As the gate-to-channel distance decreases, transconductance (GM) increases due to enhanced gate control, and the threshold voltage (VTH) shifts positively, exhibiting immunity to short-channel effects (SCEs) while preserving a better aspect ratio. Then the scaling behavior of SG-HEMT is explored with different gate lengths (LG). Besides, the impact of LSD scaling was studied through comprehensive simulations, and the device-performance metrics were thoroughly analyzed. The findings reveal that a 40 nm LG device achieves the highest GM of 423.8 mS/mm, an ID_peak of 2.58 A/mm, and a peak fT of 239.2 GHz, attributable to the higher polarization of ScAlN and impeded parasitic channel development as an outcome of the g-AlgaN BB, suggesting that lateral scaling is a viable method for enhancing device performance. This work manifests that high current densities can be achieved owing to a high sheet charge density at Sc0.18Al0.82N/GaN interface, highlighting the significant potential of SG-HEMTs for enhancing output power at the device level in millimeter-wave (mmw) frequencies and propelling HEMT functionalities.</div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"86 1","pages":"31 - 41"},"PeriodicalIF":0.8,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142939309","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Insights and guidelines on the Cauchy horizon theorems 柯西视界定理的洞见与指导

IF 0.8 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2024-11-08 DOI: 10.1007/s40042-024-01210-8

Xiao Yan Chew, Dong-han Yeom

{"title":"Insights and guidelines on the Cauchy horizon theorems","authors":"Xiao Yan Chew, Dong-han Yeom","doi":"10.1007/s40042-024-01210-8","DOIUrl":"10.1007/s40042-024-01210-8","url":null,"abstract":"<div>Recently, there has been progress to resolve the issue regarding the non-existence of the Cauchy horizon inside the static, charged, and spherically symmetric black holes. However, when we generically extend the black holes’ spacetime, they are not just static but can be dynamical, thus the interior of black holes does not remain the same as the static case when we take into account the dynamical evolution of black holes. Hence, the properties of the Cauchy horizon could behave differently in the dynamical case. Then, our aim in this paper is to provide a few constructive insights and guidelines regarding this issue by revisiting a few examples of the gravitational collapse of spherically symmetric charged black holes using the double-null formalism. Our numerical results demonstrate that the inside of the outer horizon is no longer static even in late time, and the inner apparent horizon exists but is not regular. The inner apparent horizon can be distinguished clearly from the Cauchy horizon. The spherical symmetric property of black holes allows the inner horizon to be defined in two directions, i.e., the differentiation of the areal radius vanishes along either the out-going or the in-going null direction. Moreover, the Cauchy horizon can be generated from a singularity. Still, the notion of the singularity can be subtle where it can have a vanishing or non-vanishing areal radius; the corresponding curvature quantities could be finite or diverge, although the curvatures can be greater than the Planck scale. Finally, we show some examples that the “hair” which is associated with the matter field on the inner horizon is not important to determine the existence of the Cauchy horizon; rather, the hair on the outer horizon might play an important role on the Cauchy horizon. Therefore, the dynamic properties of the interior of charged black holes could shed light for us to understand deeply about the Cauchy horizon for the extensions of no-Cauchy-horizon theorems.</div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"85 12","pages":"1050 - 1061"},"PeriodicalIF":0.8,"publicationDate":"2024-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142826404","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Simultaneous analysis of rotational and vibrational spectra in even–even deformed nuclei: a study on (^{168})Er 均匀变形核的旋转和振动谱的同时分析：(^{168}) Er的研究

IF 0.8 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2024-11-08 DOI: 10.1007/s40042-024-01219-z

Su Youn Lee

引用次数: 0

Transferred single-layer graphene on pre-patterned metal electrode: comparison of thermoelectric and electric properties 在预图案化金属电极上转移单层石墨烯：热电特性和电特性的比较

IF 0.8 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2024-11-08 DOI: 10.1007/s40042-024-01218-0

Hye-Mi So, Hyun-June Jung, Sanghee Cho

引用次数: 0

Making public reputation out of private assessments 用私人评估打造公众声誉

IF 0.8 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2024-11-08 DOI: 10.1007/s40042-024-01192-7

Youngsuk Mun, Quang Anh Le, Seung Ki Baek

{"title":"Making public reputation out of private assessments","authors":"Youngsuk Mun, Quang Anh Le, Seung Ki Baek","doi":"10.1007/s40042-024-01192-7","DOIUrl":"10.1007/s40042-024-01192-7","url":null,"abstract":"<div>Reputation is not just a simple opinion that an individual has about another, but a social construct that emerges through communication. Despite the huge importance in coordinating human behavior, such a communicative aspect has remained relatively unexplored in the field of indirect reciprocity. In this work, we bridge the gap between private assessment and public reputation. We begin by clarifying what we mean by reputation and argue that the formation of reputation can be modeled by a bi-stochastic matrix, provided that both assessment and behavior are regarded as continuous variables. By choosing bi-stochastic matrices that represent averaging processes, we show that only four norms among the leading eight, which judge a good person’s cooperation toward a bad one as good, will keep cooperation asymptotically or neutrally stable against assessment error in a homogeneous society where every member has adopted the same norm. However, when one of those four norms is used by the resident population, the opinion averaging process allows neutral invasion of mutant norms with small differences in the assessment rule. Our approach provides a theoretical framework for describing the formation of reputation in mathematical terms.</div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"85 12","pages":"969 - 976"},"PeriodicalIF":0.8,"publicationDate":"2024-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142826403","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Self-powered visible-blind ultraviolet photodetectors based on SnO2 nanowire cotton synthesized using thermal chemical vapor deposition 基于热化学气相沉积法合成的 SnO2 纳米线棉的自供电可见光盲紫外线光电探测器

IF 0.8 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2024-11-07 DOI: 10.1007/s40042-024-01214-4

Mijin Park, Hyon Chol Kang

引用次数: 0