Journal of the Korean Physical Society最新文献_第10页

Common origin of dark matter, baryon asymmetry and neutrino masses in the standard model with extended scalars 具有扩展标量的标准模型中暗物质、重子不对称和中微子质量的共同起源

IF 0.6 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2024-05-15 DOI: 10.1007/s40042-024-01080-0

Sin Kyu Kang, Raymundo Ramos

引用次数: 0

Characterizing lateral frictional properties on nanostructured periodic surface of Ni fabricated using femtosecond laser pulses 利用飞秒激光脉冲表征镍的纳米结构周期表面的横向摩擦特性

IF 0.6 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2024-05-15 DOI: 10.1007/s40042-024-01067-x

Hyejee Choi, Shinhui Kim, T. Park, T. Hwang, Jongweon Cho

引用次数: 0

Effect of proton-beam irradiation on cell survival of MCF-7 and its chemo-resistant subgroups 质子束辐照对 MCF-7 及其耐化疗亚群细胞存活率的影响

IF 0.6 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2024-05-15 DOI: 10.1007/s40042-024-01089-5

Sushma Maharjan, Min-Gu Lee, Kyung-Soo Nam, Kyu-Shik Lee

引用次数: 0

Performance test of half-wave resonator (HWR) superconducting cavities 半波谐振器（HWR）超导腔性能测试

IF 0.6 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2024-05-15 DOI: 10.1007/s40042-024-01084-w

Heetae Kim, Sungmin Jeon, Juwan Kim, Yoochul Jung

引用次数: 0

Analytic validation of convolutional neural network-based classification of pigmented skin lesions (PSLs) using unseen PSL hyperspectral data for clinical applications 基于卷积神经网络的色素性皮肤病变（PSL）分类的分析验证（利用未见过的 PSL 高光谱数据进行临床应用

IF 0.6 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2024-05-10 DOI: 10.1007/s40042-024-01069-9

Eun Jeong Heo, Chun Gun Park, Kyung Hwan Chang, Jang Bo Shim, Soo Hong Seo, Dai Hyun Kim, Song Heui Cho, Chul Yong Kim, Nam Kwon Lee, Suk Lee

{"title":"Analytic validation of convolutional neural network-based classification of pigmented skin lesions (PSLs) using unseen PSL hyperspectral data for clinical applications","authors":"Eun Jeong Heo, Chun Gun Park, Kyung Hwan Chang, Jang Bo Shim, Soo Hong Seo, Dai Hyun Kim, Song Heui Cho, Chul Yong Kim, Nam Kwon Lee, Suk Lee","doi":"10.1007/s40042-024-01069-9","DOIUrl":"https://doi.org/10.1007/s40042-024-01069-9","url":null,"abstract":"In this study, we aimed not only to analyze model performance of the convolutional neural network (CNN)-based pigmented skin lesion (PSL) classification, but also analyze the analytic validation of the CNN-based PSL classification using unseen PSL hyperspectral dataset with an FNR. To this end, 38 hyperspectral imaging (HSI) data samples were obtained from 19 patients diagnosed with PSLs based on biopsy results. The analytic validation dataset comprised both seen and unseen PSL datasets. The seen PSL dataset included 272,677 pixels from 32 HSI data samples, and the unseen PSL dataset included 370,820 pixels from 38 HSI data samples. A snapshot-based hyperspectral camera captured the spectral (2048 × 2048 pixels) and spatial (150 spectral bands, 470–900 nm) data. A dermatologist labeled the acquired HSI data as pigmented basal cell carcinoma (BCC), melanoma, and squamous cell carcinoma (SCC) to obtain hyperspectral data for each PSL class in software. A confusion matrix and specific performance metrics were used to evaluate CNN-based PSL classification performance. The false negative ratio (FNR) for melanoma were 0.0284 ± 0.0051 and 0.4317 ± 0.0269 for seen and unseen PSL dataset, respectively. Furthermore, 49.14% of the unseen SCC hyperspectral data was predicted as BCC. We confirmed unseen SCC hyperspectral data was most commonly confused for BCC. Therefore, we confirmed the feasibility of analytic validation of the CNN-based PSL classification using unseen PSL hyperspectral dataset for clinical applications.","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140930383","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

Measurement of environmental radioactivity for RAON using HPGe detector and LSC 使用 HPGe 探测器和 LSC 测量 RAON 的环境放射性

IF 0.6 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2024-05-10 DOI: 10.1007/s40042-024-01090-y

Danhye Gil, Beomyeol Baek, Jongwook Kim, Kyungha Jo, Keunsoo Yang, Inseok Hong

{"title":"Measurement of environmental radioactivity for RAON using HPGe detector and LSC","authors":"Danhye Gil, Beomyeol Baek, Jongwook Kim, Kyungha Jo, Keunsoo Yang, Inseok Hong","doi":"10.1007/s40042-024-01090-y","DOIUrl":"https://doi.org/10.1007/s40042-024-01090-y","url":null,"abstract":"The Rare isotope Accelerator complex for On-line experiments (RAON) has been built for providing the beam of exotic rare isotope of various energies at the Institute for Basic Science (IBS). The activation was evaluated by the MCNP simulation in the shielding design process, which guarantees the radiation safety on this facility. To ensure the additional radiation safety, the radiation is monitored inside and outside of the facility during operation of the RAON. The inside of the facility is monitored in real-time using the Radiation Monitoring System (RMS) composed of the various types of the detectors. In case of monitoring outside the facility, we measure the radioactivity of soil and groundwater around the facility. The soil is sampled in the five designated locations around the facility and the groundwater sample is taken from the seven collecting wells in the facility. We measure the radioactivities of 7Be, 22Na, 54Mn from the soil sample and those of 7Be, 22Na, 3H from the groundwater sample. These radionuclides were chosen based on the MCNP simulation, which was compared with our measurement result.","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140930094","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

Phonon-assisted hot carrier re-population in 2D Te thin films 二维 Te 薄膜中的声子辅助热载流子再填充

IF 0.6 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2024-05-09 DOI: 10.1007/s40042-024-01076-w

Dong-Yub Yee, Ji-Hee Kim

{"title":"Phonon-assisted hot carrier re-population in 2D Te thin films","authors":"Dong-Yub Yee, Ji-Hee Kim","doi":"10.1007/s40042-024-01076-w","DOIUrl":"https://doi.org/10.1007/s40042-024-01076-w","url":null,"abstract":"Two-dimensional (2D) Tellurium (Te) films, emerging as a new member of a single elemental material, have gained significant attention for its potential in advanced optoelectronic devices. Here, we examined the hot carrier dynamics of Te via ultrafast transient reflection spectroscopy. The hot carrier population and relaxation processes in the second excited state are studied under resonant (1.55 eV) and nonresonant (3.1 eV) excitation conditions. A notably prolonged carrier relaxation time of 219 ps was observed under resonant excitation conditions. In contrast, hot carrier relaxation under nonresonant excitation showed an abnormal trend of rapid decrease followed by an abrupt increase around a time delay of 20 ps. This anomaly is attributed to the re-population of hot carriers, driven by decreased thermalization rates coupled with a retardation of carrier intervalley scattering within Te. We also found that the strong electron–phonon coupling in Te films promoted intervalley scattering. These results provide fundamental insights into the excited-state relaxation processes in Te, offering potential opportunities for the advancement of high-efficiency Te-based thermoelectric and electric devices.","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140930104","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

Optoelectronic and structural properties of multilayer oxide/silver/oxide transparent conducting electrodes using green laser annealing 利用绿色激光退火技术实现多层氧化物/银/氧化物透明导电电极的光电和结构特性

IF 0.6 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2024-05-06 DOI: 10.1007/s40042-024-01074-y

Manikandan Rajendran, Keh-Moh Lin

{"title":"Optoelectronic and structural properties of multilayer oxide/silver/oxide transparent conducting electrodes using green laser annealing","authors":"Manikandan Rajendran, Keh-Moh Lin","doi":"10.1007/s40042-024-01074-y","DOIUrl":"https://doi.org/10.1007/s40042-024-01074-y","url":null,"abstract":"Transparent conducting ITO/Ag/ITO (IAI) and AZO/Ag/AZO (ZAZ) multilayer electrodes were fabricated using radio frequency magnetron sputtering at room temperature. Subsequently, a green laser was employed for annealing these multilayer films to improve their optical, electrical, and structural properties. Their optical and electrical properties were characterized using a UV–Vis spectrophotometer, and a four-point probe station, respectively, while structural properties were characterized using X-ray diffraction (XRD) and transmission electron microscopy (TEM). After laser annealing, XRD analysis indicated an increase in Ag intensity peak, correlating with larger crystallite size post-annealing. TEM analysis confirmed the formation of a continuous structure as weakly connected Ag crystallites bonded during the annealing process. The IAI electrodes showed significant improvement, reducing sheet resistance from 8.2 Ω/sq to 6.9 Ω/sq, and the Haacke index improved from ϕVis ≈ 17 × 10−3 Ω−1 to ϕVis ≈ 21 × 10−3 Ω−1. In contrast, the physical properties of the ZAZ electrodes could not be further improved by the laser annealing process, as their Ag layers already exhibited high crystallinity. Our results indicate that optimizing the conductivity of the Ag layer is crucial for the optoelectronic performance of multilayer electrodes. This optimization can be achieved through laser annealing with suitable energy densities and using oxide layers promoting dense Ag growth.","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140887068","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

Ultrafast reversible phase engineering in MoTe2 thin film via polaron formation 通过极子形成实现 MoTe2 薄膜中的超快可逆相工程

IF 0.6 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2024-05-06 DOI: 10.1007/s40042-024-01077-9

Ji-Hee Kim, Gunnar Schönhoff, Michael Lorke, Tim O. Wehling, Ki-Ju Yee

{"title":"Ultrafast reversible phase engineering in MoTe2 thin film via polaron formation","authors":"Ji-Hee Kim, Gunnar Schönhoff, Michael Lorke, Tim O. Wehling, Ki-Ju Yee","doi":"10.1007/s40042-024-01077-9","DOIUrl":"https://doi.org/10.1007/s40042-024-01077-9","url":null,"abstract":"The emergence of various polymorphs in two-dimensional transition metal dichalcogenides provides an opportunity for robust phase engineering by temperature, strain, laser irradiation, and external charge doping (Keum in Nat. Phys. 11:482, 2015; Song in Nano Lett. 16:188, 2016; Cho in Science 349:625, 2015; Kim in Nano Lett. 17:3363, 2017). This provides means to develop homojunction of metal–semiconductor, enhance mobility, reduce contact resistance, and observe novel quantum critical phenomena in mesoscopic systems. The rich physics paves the way for ultrafast light-induced switching/memory devices and optical data processing in optoelectronics. However, the fundamental temporal evolution of the laser-driven phase transformation, in particular regarding heat and charge carriers, remains elusive. We report an ultrafast reversible structural transformation in MoTe2 by coherent phonon dynamics through polaron formation at room temperature. At a high photon density, the generated coherent phonons are coupled with excitons to form polarons. The strong exciton–phonon coupling disturbs and dephases the coherent phonons of the semiconducting 2H phase in MoTe2, and generates lattice distortions to further stabilize new coherent phonons of the metallic 1T’-phase, manifested by the emergence of the corresponding phonons in each phase. This structural transformation is fully reversible within a few picoseconds by switching on/off the laser. The nonlinear response of the phonon intensity to the excited carrier density in the intermediate region indicates a gradual structural transformation through coexisting 2H and 1T’ phases.","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140887148","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

Emission characteristics of the slowest target protons produced in the interaction of $$^{84}Kr$$ nuclei with emulsion nuclei at 1 A GeV $$^{84}Kr$$ 核与乳状核在 1 A GeV 的相互作用中产生的最慢靶质子的发射特性

IF 0.6 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2024-05-06 DOI: 10.1007/s40042-024-01071-1

Babita Kumari, Manoj Kumar Singh, Rashmi Singh

{"title":"Emission characteristics of the slowest target protons produced in the interaction of $$^{84}Kr$$ nuclei with emulsion nuclei at 1 A GeV","authors":"Babita Kumari, Manoj Kumar Singh, Rashmi Singh","doi":"10.1007/s40042-024-01071-1","DOIUrl":"https://doi.org/10.1007/s40042-024-01071-1","url":null,"abstract":"Nuclear fragmentation and its possible connection to a critical phenomenon or phase transition have been the subject of intense theoretical and experimental research on the interactivity of relativistic heavy nuclei. Relativistic heavy-ion collisions enable studies of the extended state of matter at density and temperature extremes only achieved in the hot early Universe. A significant barrier to knowing the mechanism of nucleus–nucleus interactions is the study of the processes that take place in the spectator and participant regions of interacting nuclei, and in particular, the interplay between these processes. In the present work, we have studied the multiplicity distribution of the slowest target fragments (black particles), and their dependence on the interaction of different target nuclei of emulsion. We have also study the correlation of the multiplicity distribution as a function of the collision geometry. The results are compared with other experimental data as per availability. This study reveals a striking relationship between the target fragmentation processes and collision geometry with multiplicity distributions.","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140887146","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