Journal of the Korean Physical Society最新文献_第6页

Analysis of the correlation network in the US stock market during January 2020 2020年1月美国股市相关网络分析

IF 0.8 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2024-10-17 DOI: 10.1007/s40042-024-01196-3

Doobae Jun, Seoyoung Oh, Gwangil Kim

{"title":"Analysis of the correlation network in the US stock market during January 2020","authors":"Doobae Jun, Seoyoung Oh, Gwangil Kim","doi":"10.1007/s40042-024-01196-3","DOIUrl":"10.1007/s40042-024-01196-3","url":null,"abstract":"<div>In January 2020, our study delved into the US stock market’s dynamics as COVID-19 began to affect the global economy. We scrutinized the Dow Jones Industrial Average (DJI) stocks, focusing on the correlations of their returns. We discerned patterns and anomalies through a structural and dynamic analysis of the correlation network facilitated by a distance function applied to the correlation coefficients. The study emphasized the significance of the minimum spanning tree (MST) in shaping the network’s structure and influencing the expansion of subnetworks. Central nodes with high connectivity in the MST emerged as crucial, particularly when the market exhibited abnormal behavior. These nodes’ daily variations and correlation structures provided insights into the market’s evolving nature. We observed that the MST’s radius was particularly reactive to market abnormalities, serving as a potential crisis indicator. Our analysis connected the alterations in the MST’s central nodes and the overall network structure with shifts in the four fundamental statistical moments of the correlation coefficients and distance weights. These elements proved to be instrumental in detecting and analyzing market irregularities.</div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"85 11","pages":"942 - 953"},"PeriodicalIF":0.8,"publicationDate":"2024-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142761771","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

Understanding the dynamics of feeding as a random walk on the feeding-rate axis 理解喂入动力学是在喂入速率轴上的随机游走

IF 0.8 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2024-10-11 DOI: 10.1007/s40042-024-01193-6

Kyung Suk Lee

{"title":"Understanding the dynamics of feeding as a random walk on the feeding-rate axis","authors":"Kyung Suk Lee","doi":"10.1007/s40042-024-01193-6","DOIUrl":"10.1007/s40042-024-01193-6","url":null,"abstract":"<div>In animals, the presence of food stimulates appetite and induces feeding behaviors. This is an important mechanism, instrumental for animals’ competitiveness in fluctuating environment. To learn fundamental principles of feeding regulation, it is useful to study simple model organisms, whose feeding dynamics can be quantitatively measured. Recently, we measured the feeding dynamics of the nematode C. elegans, whose feeding consists of pumping bacteria from the environment into the gut, and demonstrated that it matches its feeding activity with the availability of food by modulating the frequency and duration of persistent fast pumping periods. Here, we develop an effective model that described these dynamics as a random walk on the pumping-rate axis, experiencing food-dependent transition probabilities. This model suggests the existence of two classes of fast pumping: the first is characterized by persistent fast-rate pumping, while the other exhibits only transient fast pumping. We show, however, that it is the dynamics of transient fast pumping that is governed by the presence of food. Furthermore, we use the model to show that serotonin is used by worms both in a food-independent mechanism that promotes acceleration of pumping and address the different roles of two pairs of serotonergic neurons.</div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"85 11","pages":"954 - 959"},"PeriodicalIF":0.8,"publicationDate":"2024-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142762035","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

A customized template matching classification system 定制模板匹配分类系统

IF 0.8 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2024-10-08 DOI: 10.1007/s40042-024-01182-9

Jie Xu, Changmao Yang, Jianping Chen

{"title":"A customized template matching classification system","authors":"Jie Xu, Changmao Yang, Jianping Chen","doi":"10.1007/s40042-024-01182-9","DOIUrl":"10.1007/s40042-024-01182-9","url":null,"abstract":"<div>This paper presents two novel classification techniques, the customized template matching classifier (CTMC) and the dynamic template matching classifier (DTMC), which aim to significantly enhance the performance of the minimum distance classifier (MDC). CTMC tailors a feature subspace specifically for MDC, leveraging a set of effective templates that capture the distinguishing characteristics of each class. This customized feature space ensures accurate representation and enhanced distinguishability between classes, thereby improving MDC’s classification accuracy. DTMC, on the other hand, builds upon the CTMC approach by introducing a dynamic template optimization process. Inspired by semi-supervised learning techniques, DTMC utilizes unlabeled data to enrich class information and iteratively update the templates in the feature space. This dynamic optimization process allows DTMC to adapt to variations in the data, further enhancing the classification performance of MDC. Our key contributions include: (1) introducing the concept of a customized feature space tailored for MDC, demonstrating its effectiveness in improving classifier performance; (2) presenting CTMC and DTMC as comprehensive classification systems that seamlessly integrate feature extraction and classification, outperforming traditional loosely coupled approaches; and (3) incorporating a reliability mechanism to assess the classification of test samples, enabling the selection of high-reliability samples to update class templates, effectively addressing the issue of limited labeled data and further boosting the overall performance of the classification system.</div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"85 10","pages":"867 - 882"},"PeriodicalIF":0.8,"publicationDate":"2024-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142672355","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

Limiting factor for electron mobility in sputtered Ga-doped ZnO thin films 溅射ga掺杂ZnO薄膜中电子迁移率的限制因素

IF 0.8 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2024-10-08 DOI: 10.1007/s40042-024-01194-5

Deok Kyu Kim

引用次数: 0

Characterization of SERS–fluorescence bimodal nanocomposites from Au-decorated CaTiO3:Eu3+ 金装饰 CaTiO3:Eu3+ SERS 荧光双模纳米复合材料的表征

IF 0.8 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2024-10-03 DOI: 10.1007/s40042-024-01181-w

Da Young Kim, Gyeong Bok Jung

{"title":"Characterization of SERS–fluorescence bimodal nanocomposites from Au-decorated CaTiO3:Eu3+","authors":"Da Young Kim, Gyeong Bok Jung","doi":"10.1007/s40042-024-01181-w","DOIUrl":"10.1007/s40042-024-01181-w","url":null,"abstract":"<div>Surface-enhanced Raman scattering (SERS)–fluorescence bimodal composites have attracted great interest for biomedical applications. Herein, we report the characterization of Au-decorated CaTiO3:Eu3+ nanocomposites (CaTiO3:Eu3+@Au NCs) using SERS and fluorescence properties. X-ray diffraction (XRD) of the CaTiO3:Eu3+@Au NCs shows orthorhombic phases, which are in good agreement with the standard CaTiO3 XRD peaks. The photoluminescence (PL) spectra show a strong visible red emission at 614 nm (5D0 → 7F2) with an excitation wavelength of 380 nm. The PL-emission intensity of the CaTiO3:Eu3+@Au NCs increased more than that of the CaTiO3:Eu3+ powder. The maximum PL-emission intensity of the CaTiO3:Eu3+@Au NCs was obtained at an Au doping concentration of 0.8 mol/L; however, the intensity at higher Au doping concentrations (> 0.8 mol/L) was lower. This behavior is consistent with the SERS results. These results suggest that varying the Au nanoparticle concentration can control the PL-emission intensity and SERS of the CaTiO3:Eu3+@Au NCs. Therefore, CaTiO3:Eu3+@Au NCs may be useful for multiplex detection and bioimaging.</div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"85 10","pages":"838 - 844"},"PeriodicalIF":0.8,"publicationDate":"2024-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142672572","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

Resistivity characteristics near the metal–insulator transition in the half-filled Anderson–Hubbard model 半填充安德森-哈伯德模型中金属-绝缘体转变附近的电阻特性

IF 0.8 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2024-10-03 DOI: 10.1007/s40042-024-01186-5

Thi-Hai-Yen Nguyen, Anh-Tuan Hoang, Duc-Anh Le

引用次数: 0

Erratum: Comparative analysis of single and triple material 10 nm Tri-gate FinFET 勘误：单材料和三材料 10 纳米三栅极 FinFET 的比较分析

IF 0.8 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2024-10-03 DOI: 10.1007/s40042-024-01191-8

Shankhamitra Sunani, Satya Sopan Mahato, Kanjalochan Jena, Raghunandan Swain

引用次数: 0

Revisit to the fluid Love numbers and the permanent tide of the Earth 重温流动的爱的数字和地球永久的潮汐

IF 0.8 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2024-10-03 DOI: 10.1007/s40042-024-01174-9

Sung-Ho Na, Yu Yi, Young-Hong Shin

{"title":"Revisit to the fluid Love numbers and the permanent tide of the Earth","authors":"Sung-Ho Na, Yu Yi, Young-Hong Shin","doi":"10.1007/s40042-024-01174-9","DOIUrl":"10.1007/s40042-024-01174-9","url":null,"abstract":"<div>Love numbers h, k, and l are convenient parameters to assess the deformation of the Earth or other planet due to external perturbing forces. While the elastic Love numbers are used for tidal deformation, the correct amount of permanent tidal deformation can be assessed using the fluid Love numbers. Accurate values of the elastic Love numbers of Earth have been repeatedly attained for several Earth models, and also the fluid Love numbers hf and kf of the Earth were recently reported. In this short note, new evaluation of the Earth’s fluid Love number as well as secular Love number, both originally defined by Munk and MacDonald, is presented using updated values of the Earth’s physical property model and with minute enhancement in the formulation; ({(h}_{s}, {k}_{s}) =(1.9437, 0.9437)) by their 1st approach and ({(h}_{f}, {k}_{f}) =(1.9337, 0.9337)) by their 2nd approach. Through numerical calculations with gradual stepwise reduction in rigidity, the three fluid Love numbers of the Earth were determined as: (hf, kf, lf) = (1.935, 0.935, 1.07) for PREM and (hf, kf, lf) = (1.937, 0.937, 1.07) for ak135-F Earth models. In addition, the fluid Love numbers of other spherical harmonic degrees 0, 3, 4, and 5 were estimated. The permanent tide of the Earth ellipsoid due to the Moon and the Sun has been re-calculated: the vertical displacement of the permanent tide is 0.1924 m at the equator and (- 0.3801) m at the pole, while the horizontal displacement of the permanent tide is found to be 0.317 m at mid-latitude.</div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"85 9","pages":"783 - 790"},"PeriodicalIF":0.8,"publicationDate":"2024-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142540563","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

Localized surface plasmon resonance of a Cu nanodot array covered with a native oxidation layer 覆盖天然氧化层的Cu纳米点阵列的局部表面等离子体共振

IF 0.8 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2024-09-25 DOI: 10.1007/s40042-024-01185-6

Mi Jung

引用次数: 0

Radiation enhancement of a terahertz backward wave oscillator with a two-stage rectangular waveguide grating 两级矩形波导光栅太赫兹后向波振荡器的辐射增强

IF 0.8 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2024-09-25 DOI: 10.1007/s40042-024-01183-8

Kwang-Ho Jang, Geun-Ju Kim, Sanghoon Kim, Tae Heon Kim, Jeong-Hun Lee, Insoo S. Kim, Jung-Il Kim

引用次数: 0