检索结果-南通市图书馆

Petroleum Science 2020年第1期17卷 182-195页

作者： Byeongcheol Kang Hyungsik Jung hoonyoung jeong Jonggeun Choe Department of Energy Systems Engineering Seoul National UniversitySeoul 08826South Korea

Ensemble-based analyses are useful to compare equiprobable scenarios of the reservoir ***,they require a large suite of reservoir models to cover high uncertainty in heterogeneous and complex reservoir *** stable convergence in ensemble Kalman filter(EnKF),increasing ensemble size can be one of the solutions,but it causes high computational cost in large-scale reservoir *** this paper,we propose a preprocessing of good initial model selection to reduce the ensemble size,and then,EnKF is utilized to predict production performances *** the model selection scheme,representative models are chosen by using principal component analysis(PCA)and clustering *** dimension of initial models is reduced using PCA,and the reduced models are grouped by ***,we choose and simulate representative models from the cluster groups to compare errors of production predictions with historical observation *** representative model with the minimum error is considered as the best model,and we use the ensemble members near the best model in the cluster plane for applying *** demonstrate the proposed scheme for two 3D models that EnKF provides reliable assimilation results with much reduced computation time.

关键词： Channel reservoir characterization Model selection scheme Egg model Principal component analysis(PCA) Ensemble Kalman filter(EnKF) History matching

A novel framework for predicting non-stationary production time series of shale gas based on BiLSTM-RF-MPA deep fusion model

在线全文

学校读者我要写书评

暂无评论

Petroleum Science 2024年第5期21卷 3326-3339页

作者： Bin Liang Jiang Liu Li-Xia Kang Ke Jiang Jun-Yu You hoonyoung jeong Zhan Meng State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu610500SichuanChina Xinjiang Oilfield Corporation PetroChinaKaramay 834000XinjiangChina Research Institute of Petroleum Exploration&Development Beijing100086China Chongqing University of Science and Technology Chongqing401331China Department of Energy Resources Engineering Seoul National University.1Gwanak-roGwanakguSeoul08826Republic of Korea Institute of Engineering Research Seoul National UniversitySeoul08826Rpublic of Korea

Shale gas, as an environmentally friendly fossil energy resource, has gained significant commercial development and shows immense potential. However, accurately predicting shale gas production faces substantial challenges due to the complex law of decline, nonlinear and non-stationary features in production data, which greatly repair the robustness of current models in predicting shale gas production time series. To address these challenges and improve accuracy in production forecasting, this paper introduces a novel and innovative approach: a hybrid proxy model that combines the bidirectional long short-term memory(BiLSTM) neural network and random forest(RF) through deep learning. The BiLSTM neural network is adept at capturing long-term dependencies, making it suitable for understanding the intricate relationships between input and output variables in shale gas *** the other hand, RF serves a dual purpose: reducing model variance and addressing the concept drift problem that arises in non-stationary time series predictions made by BiLSTM. By integrating these two models, the hybrid approach effectively captures the inherent dependencies present in long and nonstationary production time series, thereby reducing model uncertainty. Furthermore, the combination of BiLSTM and RF is optimized using the recently-proposed marine predators algorithm(MPA) to fine-tune hyperparameters and enhance the overall performance of the proxy model. The results demonstrate that the proposed BiLSTM-RF-MPA model achieves higher prediction accuracy and demonstrates stronger generalization capabilities by effectively handling the complex nonlinear and non-stationary characteristics of shale gas production time series. Compared to other models such as LSTM, BiLSTM, and RF, the proposed model exhibits superior fitting and prediction performance, with an average improvement in performance indicators exceeding 20%. This innovative framework provides valuable insights for forecastin

关键词： Production forecasting Shale gas BiLSTM-RF-MPA model Nonstationary production time series Deep learning

Single-cell and spatial omics:exploring hypothalamic heterogeneity

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第6期20卷 1525-1540页

作者： Muhammad Junaid Eun jeong Lee Su Bin Lim Department of Biochemistry&Molecular Biology Ajou University School of MedicineSuwonSouth Korea Department of Biomedical Sciences Graduate School of Ajou UniversitySuwonSouth Korea Department of Brain Science Ajou University School of MedicineSuwonSouth Korea

Elucidating the complex dynamic cellular organization in the hypothalamus is critical for understanding its role in coordinating fundamental body functions. Over the past decade, single-cell and spatial omics technologies have significantly evolved, overcoming initial technical challenges in capturing and analyzing individual cells. These high-throughput omics technologies now offer a remarkable opportunity to comprehend the complex spatiotemporal patterns of transcriptional diversity and cell-type characteristics across the entire hypothalamus. Current single-cell and single-nucleus RNA sequencing methods comprehensively quantify gene expression by exploring distinct phenotypes across various subregions of the hypothalamus. However, single-cell/single-nucleus RNA sequencing requires isolating the cell/nuclei from the tissue, potentially resulting in the loss of spatial information concerning neuronal networks. Spatial transcriptomics methods, by bypassing the cell dissociation, can elucidate the intricate spatial organization of neural networks through their imaging and sequencing technologies. In this review, we highlight the applicative value of single-cell and spatial transcriptomics in exploring the complex molecular-genetic diversity of hypothalamic cell types, driven by recent high-throughput achievements.

关键词： cellular diversity hypothalamus multi-omics single-cell transcriptomics spatial transcriptomics

Ru/NiMnB spherical cluster pillar for highly proficient green hydrogen electrocatalyst at high current density

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2025年第1期100卷 397-408页

作者： Md Ahasan Habib Shusen Lin Mehedi Hasan Joni Sumiya Akter Dristy Rutuja Mandavkar Jae-Hun jeong Jihoon Lee Department of Electronic Engineering College of Electronics and Information Kwangwoon University

Advanced OER/HER electrocatalytic alternatives are crucial for the wide adaptation of green hydrogen ***,Ru/NiMnB spherical cluster pillar （SCP）,denoted as Ru/NiMnB,is synthesized using a combination of electro-deposition and hydrothermal *** investigation of Ru doping in the NiMnB matrix revealed significant improvements in electrocatalytic *** Ru/NiMnB SCPs demonstrate superior OER/HER activity with low overpotentials of 150 and 103 mV at 50mA/cm2in 1 M KOH,making them highly competitive with state-of-the-art ***,the Ru/NiMnB SCPs exhibit a low 2-E cell voltage of 2.80 V at ultra-high current density of 2,000 m A/cm2in 1 M KOH,outperforming the standard benchmark electrodes of RuO2||Pt/C,thereby positioning Ru/NiMnB as one of the best bifunctional *** SCPs exhibit exceptional high-current characteristics,stability and corrosion resistance,as evidenced by continuous operation at 1,000 mA/cm2high-current density for over 150 h in 6 M KOH at elevated temperatures under harsh industrial *** a small amount of Ru incorporation significantly enhances the electrocatalytic performances of NiMnB,attributed to increased active sites and improved intrinsic properties such as conductivity,adsorption/desorption capability and reaction ***,Ru/NiMnB SCPs present a promising bi-functional electrode concept for efficient green H2production.

关键词： Advanced electrocatalyst High current Corrosion resistance Industrial requirement

Saccharomyces boulardii as a single trigger of food protein-induced enterocolitis syndrome: Seven case reports

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2025年第6期13卷 35-40页

作者： Jin-Bok Hwang Hyo-jeong Jang Department of Pediatrics Keimyung University School of MedicineDongsan Medical CenterDaegu 42601South Korea

BACKGROUND Food protein-induced enterocolitis syndrome(FPIES)is the most serious type of non-immunoglobulin E(IgE)-mediated food allergic reaction manifesting as sepsis-like symptom,which can lead to *** boulardii(***),a probiotic prescribed frequently in clinical settings,has been reported to trigger FPIES in an infant with soy-triggered *** this report,we describe a new clinical FPIES in which *** was the sole triggering factor of acute FPIES adverse reaction in seven healthy *** SUMMARY Seven FPIES cases triggered by only *** were gathered from 2011 to the *** of the patients had previously experienced any allergic reaction to cow’s milk,soy,or complementary *** age of the patients was 4-10-months old,and the symptoms of FPIES developed after ingestion of ***,which is mostly prescribed for the treatment of gastroenteritis or antibiotic-associated *** patients experienced severe repetitive vomiting 1-3 hours after *** *** lethargy,marked pallor,and cyanosis were also *** IgE-mediated hypersensitivity developed in any *** was followed by initial intense vomiting in approximately 5-10 hours after *** ingestion,and only one case showed bloody,purulent,and foul-smelling *** patients stabilized quickly,mostly within 6 *** got all improved within 24 hours after discontinuation of *** *** can be the sole trigger of acute FPIES and be prescribed cautiously even in healthy children without FPIES.

关键词： Food protein-induced enterocolitis syndrome Food hypersensitivity Saccharomyces boulardii Probiotics Child Case report

Current Fluctuations in a Semiconductor Quantum Dot with Large Energy Spacing

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics Letters 2014年第12期31卷 107-110页

作者： jeong Heejun Department of Applied Physics Hanyang University Ansan 426-791 Korea

Current fluctuation in electronic systems has been extensively studied due to the fact that they can pro- vide further information of charge transport compared to the conventional conductance measurements. Shot noise is the non-equilibrium electrical fluctuation due to the discrete nature of carriers flowing through a device, reflecting correlation effects. A well-known shot noise power density as uncorrelated charge trans- mission is S - 2el, with I the average current. This Poissonian shot noise can be observed in sys- tems with a single tunnel barrier. Positive or neg- ative correlations between charged particles, induced by the Coulomb interaction and the Pauli exclusion principle, can enhance or suppress shot noise from the Poissonian value. Numerous experimental and the- oretical studies of the shot noise in mesoseopie sys- tems have been carried out on various devices such as self-assembled quantum dots, resonant tunnel- ing diodes,molecular junction devices, quan- tum point contacts,semiconductor quantum dots, and metal atomic chains. Externally driven exci- tations which affect shot noise properties were also investigated.

关键词： Current Fluctuations Semiconductor Quantum Large Energy Spacing

The Effect of Plasma Surface Treatment on a Porous Green Ceramic Film with Polymeric Binder Materials

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Plasma Science and Technology 2013年第6期15卷 521-527页

作者： jeong Woo YUN School of Applied Chemical Engineering Chonnam National University

To reduce time and energy during thermal binder removal in the ceramic process, plasma surface treatment was applied before the lamination *** adhesion strength in the lamination films was enhanced by oxidative plasma treatment of the porous green ceramic film with polymeric binding *** oxygen plasma characteristics were investigated through experimental parameters and weight loss *** experimental results revealed the need for parameter analysis,including gas material,process time,flow rate,and discharge power,and supported a mechanism consisting of competing ablation and deposition *** weight loss analysis was conducted for cyclic plasma treatment rather than continuous plasma treatment for the purpose of improving the film’s permeability by suppressing deposition of the ablated *** cyclic plasma treatment improved the permeability compared to the continuous plasma treatment.

关键词： plasma surface treatment oxidative plasma green ceramic film ablation deposition

Rice tissue-specific promoters and conditiondependent promoters for effective translational application

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Plant Biology 2015年第11期57卷 913-924页

作者： Hee-jeong jeong Ki-Hong Jung Department of Plant Molecular Systems Biotechnology and Crop Biotech Institute Kyung Hee University Graduate School of Biotechnology Kyung Hee University

Rice （Oryza sativa） is one of the most important staple food crops for more than half of the world＇s population. The demand is increasing for food security because of population growth and environmental challenges triggered by climate changes. This scenario has led to more interest in developing crops with greater productivity and sustainability. The process of genetic transformation, a major tool for crop improvement, utilizes promoters as one of its key elements. Those promoters are generally divided into three types： constitutive, spatiotemporal, and condition-dependent. Tran- scriptional control of a constitutive promoter often leads to reduced plant growth, due to a negative effect of accumu- lated molecules during cellular functions or energy consump- tion. To maximize the effect of a transgene on transgenic plants, it is better to use condition-dependent or tissue- specific promoters. However, until now, those types have not been as widely applied in crop biotechnology. In this review, we introduce and discuss four groups of tissue-specific promoters （5o promoters in total） and six groups of condition-dependent promoters （27 promoters）. These pro- moters can be utilized to fine-tune desirable agronomic traits and develop crops with tolerance to various stresses, enhanced nutritional value, and advanced productivity.

关键词： Condition-dependent promoters crop biotechnologyapplication genetic transformation rice tissue-specific promoters

Invariant operator theory for the single-photon energy in time-varying media

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2010年第1期19卷 56-60页

作者： Choi jeong-Ryeol School of Electrical Engineering and Computer Science Kyungpook National University

After the birth of quantum mechanics, the notion in physics that the frequency of light is the only factor that determines the energy of a single photon has played a fundamental role. However, under the assumption that the theory of Lewis-Riesenfeld invariants is applicable in quantum optics, it is shown in the present work that this widely accepted notion is valid only for light described by a time-independent Hamiltonian, i.e., for light in media satisfying the conditions, ε（t） = ε（0）, u（t） = u（0）, and σ（t） = 0 simultaneously. The use of the Lewis Riesenfeld invariant operator method in quantum optics leads to a marvelous result： the energy of a single photon propagating through time-varying linear media exhibits nontrivial time dependence without a change of frequency.

关键词： single-photon energy invariant operator theory time-varying media

Surface functionalization of single-walled carbon nanotubes using metal nanoparticles

在线全文

学校读者我要写书评

暂无评论

中国有色金属学会会刊：英文版 2009年第4期19卷 1009-1012页

作者： Goo-Hwan jeong Department of Advanced Materials Science and Engineering Kangwon National University

Surface functionalization of suspended single-walled carbon nanotubes(SWNTs) using metal(Au) nanoparticles(NPs) is *** are grown on three-dimensionally patterned substrates by thermal chemical vapor deposition and successfully functionalized with Au *** is mainly used to functionalize SWNTs surface with amino groups before introducing Au *** Raman scattering spectroscopy of the Au-functionalized suspended SWNTs,enhanced Raman scattering properties are *** results suggest that the attached Au NPs may contribute to the enhancement of resonant *** measuring the electric properties after each functionalization process,it is found that Au NPs act as electron acceptor to the amine functionalized SWNTs.

关键词：金属纳米粒子单壁碳纳米管功能化表面拉曼散射光谱 SWNTs 沉积基底化学气相