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Empirical Research on Farmer's Breaching Behavior in Order Contract 被引量:1
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作者 Guifang CHAO Mojing CHEN Xinxin DING 《Asian Agricultural Research》 2016年第12期43-47,共5页
In " leading enterprise + farmer" cooperation model,farmer's behavior of breaching contract exists generally. In this paper,from the angle of incomplete contract,the influencial factors of farmer breakin... In " leading enterprise + farmer" cooperation model,farmer's behavior of breaching contract exists generally. In this paper,from the angle of incomplete contract,the influencial factors of farmer breaking contract are analyzed. It is found that farmer sex,age,culture degree and farming period have obvious effects on the behavior of breaching contract. Under regulating effect of relationship quality,farmer assest specificity,exogenous uncertainty and endogenous uncertainty affect farmer's breaking behavior. That is,the higher the farmer assest specificity,the lower the farmer breaching tendency; higher exogenous uncertainty causes that farmer is easy to generate breaching behavior; higher endogenous uncertainty causes that farmer is also easy to take breaching behavior. 展开更多
关键词 Farmer breaching Relationship quality Assest specificity UNCERTAINTY
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Modeling of breaching parameters for debris flow dams
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作者 RUAN He-chun CHEN Hua-yong +8 位作者 CHEN Xiao-qing ZHAO Wan-yu CHEN Jian-gang WANG Tao JIANG Yao Wang Xi-an Li Xiang-ning LI Xiao YU Yun-han 《Journal of Mountain Science》 SCIE CSCD 2023年第10期2835-2851,共17页
The debris flow dam is a common type of barrier dams,which shows significant differences from other types of barrier dam such as landslide dam,moraine dam in their formation processes,dam body shapes,and internal comp... The debris flow dam is a common type of barrier dams,which shows significant differences from other types of barrier dam such as landslide dam,moraine dam in their formation processes,dam body shapes,and internal compositions.The basic breaching parameters such as flood peak discharge are vital indicators of risk assessment.In this study,we elucidated the failure process of the debris flow dam through the flume experiment,and built the calculation equation of the breaching parameters by selecting critical factors.The result shows that the overtopping failure process of the debris flow dam is capable of forming significantly retrogressive scarps,and the failure process experiences three stages,the formation of the retrogressive scarp,the erosion of the retrogressive scarp,and the decline of the retrogressive scarp.Five factors used for establishing the calculation equations for peak discharge(Qp),final width(Wb)of the breach,and duration(T)of the debris flow dam failure are dam height(h),reservoir capacity(V),the fine grain content(P0.075)of the soil,the nonuniformity coefficient(Cu)of the soil,and the upper limit grain size(D90)of the soil,respectively.In the three equations,the correlation coefficients between Qp,Wb,T and the five factors were 0.86,0.70,0.63,respectively.The equations still need to be modified and verified in actual cases. 展开更多
关键词 Debris flow dams Overtopping failure breaching g parameters Peak discharge Flume experiment
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Influence of material characteristics on the failure mode and process of landslide dam
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作者 HU Liang ZHONG Qiming +3 位作者 CHEN Liang YANG Meng ZHANG Lucheng WU Hao 《Journal of Mountain Science》 2025年第1期89-109,共21页
Landslide dams,as frequent natural hazards,pose significant risks to human lives,property,and ecological environments.The grading characteristics and density of dam materials play a crucial role in determining the sta... Landslide dams,as frequent natural hazards,pose significant risks to human lives,property,and ecological environments.The grading characteristics and density of dam materials play a crucial role in determining the stability of landslide dams and the potential for dam breaches.To explore the failure mechanisms and evolutionary processes of landslide dams with varying soil properties,this study conducted a series of flume experiments,considering different grain compositions and material densities.The results demonstrated that grading characteristics significantly influence landslide dam stability,affecting failure patterns,breach processes,and final breach morphologies.Fine-graded materials exhibited a sequence of surface erosion,head-cut erosion,and subsequent surface erosion during the breach process,while well-graded materials typically experienced head-cut erosion followed by surface erosion.In coarse-graded dams,the high permeability of coarse particles allowed the dam to remain stable,as inflows matched outflows.The dam breach model experiments also showed that increasing material density effectively delayed the breach and reduced peak breach flow discharge.Furthermore,higher fine particle content led to a reduction in the residual dam height and the base slope of the final breach profile,although the relationship between peak breach discharge and the content of fine and coarse particles was nonlinear.To better understand breach morphology evolution under different soil characteristics and hydraulic conditions,three key points were identified—erosion point,control point,and scouring point.This study,by examining the evolution of failure patterns,breach processes,and breach flow discharges under various grading and density conditions,offers valuable insights into the mechanisms behind landslide dam failures. 展开更多
关键词 Landslide dams OVERTOPPING Grain size distribution breaching process Outflow discharge
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Experimental investigation on breaching of embankments 被引量:18
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作者 ZHU YongHui VISSER P J +1 位作者 VRIJLING J K WANG GuangQian 《Science China(Technological Sciences)》 SCIE EI CAS 2011年第1期148-155,共8页
Breaching of embankments has recently drawn more and more attention due to its importance in the development of early warning systems for embankment failures,in the evacuation plans of people at risk,in the design met... Breaching of embankments has recently drawn more and more attention due to its importance in the development of early warning systems for embankment failures,in the evacuation plans of people at risk,in the design method of embankments based on a risk-approach,etc. The erosion process observed during embankment breaching tests in the laboratory and the analysis of the results are described in this paper. Five embankments,one constructed with pure sand,four with different sand-silt-clay mixtures were tested. The height of the embankments was 75 cm and the width at the crest was 60 cm. Examination of the data from these tests indicated that headcut erosion played an important role in the process of breach growth in the embankments made of cohesive soil mixtures. Flow shear erosion,fluidization of the headcut slope surface,undermining of the headcut due to impinging jet scour and discrete soil mechanical slope mass failure from the headcut were all observed during these tests. For the embankment constructed with pure sand,the breach erosion process was dominated by shear erosion,which led to a gradual and relatively uniform retreat of the downstream slope. The cohesive proportion in the sand-silt-clay mixtures strongly slowed down the erosion process. 展开更多
关键词 EMBANKMENTS breaching EXPERIMENTS headcut EROSION
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基于DL Breach模型的堰塞湖溃决洪水分析
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作者 周兴波 王双敬 +1 位作者 杨子儒 杨晟 《水利水电科技进展》 北大核心 2025年第1期68-72,78,共6页
为了高效精准地分析预测堰塞湖溃决洪水,回顾了DL Breach模型的基本原理,反演分析了唐家山堰塞湖溃决洪水流量过程,并与实测流量过程作对比。结果表明DL Breach模型具有可靠性和稳定性,利用该模型计算得出的唐家山堰塞湖溃口流量过程与... 为了高效精准地分析预测堰塞湖溃决洪水,回顾了DL Breach模型的基本原理,反演分析了唐家山堰塞湖溃决洪水流量过程,并与实测流量过程作对比。结果表明DL Breach模型具有可靠性和稳定性,利用该模型计算得出的唐家山堰塞湖溃口流量过程与实测流量过程较为接近,溃口峰值流量计算值为7 323 m^(3)/s,较实测值6 500 m^(3)/s误差约为11.2%,峰值出现时间计算值较实测值提前近1 h,主要是由于唐家山堰塞湖溃口的小石梁提升了堰塞体的抗冲刷能力。此外,坝体材料粒径增大会降低峰值流量;而黏聚力、上游坡比及初始溃口深度增大会降低溃口底高程,对峰值流量的影响较小。 展开更多
关键词 防洪工程 堰塞湖 溃决洪水 洪峰流量 DL Breach模型
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Monopolar Transurethral Resection of the Prostate: Evaluation of the Results in the Urology Department of the Sino-Guinean Friendship Hospital in Conakry (Guinea)
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作者 Thierno Amadou Oury Sow Mohamed Habiboullah Ova +5 位作者 Lahoumbo Ricardo Gnammi Mamadou Diawo Bah Thierno Mamadou Oury Diallo Ibrahima Bah Abdoulaye Bobo Diallo Oumar Raphiou Bah 《Open Journal of Urology》 2025年第2期27-33,共7页
Introduction: The therapeutic approach to benign prostatic hyperplasia (BPH) has evolved profoundly. Surgical treatment is reserved for complicated cases and the reference surgical technique is transurethral resection... Introduction: The therapeutic approach to benign prostatic hyperplasia (BPH) has evolved profoundly. Surgical treatment is reserved for complicated cases and the reference surgical technique is transurethral resection of the prostate (TURP). This work aims to study the epidemiological, clinical and therapeutic aspects of monopolar transurethral resection of the prostate in our department. Materials and Methods: We conducted a descriptive study with retrospective data collection over a 12-month period from November 1, 2023 to December 31, 2024. The urology unit, an integral part of the surgery department, of the Sino-Guinean Friendship Hospital in Conakry served as the setting for this study. It included 27 patients with benign prostatic hypertrophy treated surgically by monopolar transurethral resection and having a usable medical record. The parameters studied were epidemiological, clinics and therapeutic. Results: The mean age of the patients was 68.57 ± 5.7 years with extremes from 50 to 79 years. The peak frequency was observed between 70 and 79 years (48.15%). All our patients had lower urinary tract disorders, i.e. 100% of cases. On digital rectal examination, an increase in the volume of the prostate of benign appearance was observed in all cases. The mean prostate volume was 43.7 cc on ultrasound with extremes from 34 cc to 58 cc. The total PSA level was less than 4 ng/ml in the majority of cases. The postoperative course was generally uncomplicated (n = 26) with removal of the urinary catheter on the second postoperative day (D2). However, one peroperative complication was observed in one patient;it was a bladder breach, leading to the passage of glycine into the peritoneum. Conclusion: Transurethral resection of the prostate has reduced the length of hospital stay of our patients, as well as the comorbidities associated with the treatment. The complications associated with it are rare but potentially serious. Its performance requires in-depth mastery of the endoscopic anatomy of the lower urinary tract as well as technical operative expertise. 展开更多
关键词 RTUP MONOPOLAR BPH Bladder Breach Conakry
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Influence of breach parameter models on hazard classification of off-stream reservoirs
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作者 Nathalia Silva-Cancino Fernando Salazar +1 位作者 Ernest Bladé Marcos Sanz-Ramos 《Water Science and Engineering》 2025年第1期102-114,共13页
The classification of dams or off-stream reservoirs concerning potential hazards in the event of failure often involves the use of two-dimensional hydraulic models for computing floodwave effects.These models necessit... The classification of dams or off-stream reservoirs concerning potential hazards in the event of failure often involves the use of two-dimensional hydraulic models for computing floodwave effects.These models necessitate defining breach geometry and formation time,for which various parametric models have been proposed.These models yield different values for average breach width,time of failure,and consequently,peak flows,as demonstrated by several researchers.This study analyzed the effect of selecting a breach parametric model on the hydraulic variables,potential damages,and hazard classification of structures.Three common parametric models were compared using a set of synthetic cases and a real off-stream reservoir.Results indicated significant effects of model choice.Material erodibility exerted a significant impact,surpassing that of failure mode.Other factors,such as the Manning coefficient,significantly affected the results.Utilizing an inadequate model or lacking information on dike material can lead to overly conservative or underestimated outcomes,thereby affecting hazard classification. 展开更多
关键词 Dam breach Off-stream reservoir Hazard classification FLOODING Potential damages
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Overtopping breaching of cohesive homogeneous earth dam with different cohesive strength 被引量:36
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作者 ZHANG JianYun LI Yun +2 位作者 XUAN GuoXiang WANG XiaoGang LI Jun 《Science China(Technological Sciences)》 SCIE EI CAS 2009年第10期3024-3029,共6页
In consideration of the range of clay content of Chinese earth dams, the world's highest prototype tests have been made to research on the effects of cohesive strength of filling of cohesive homogeneous earth dam ... In consideration of the range of clay content of Chinese earth dams, the world's highest prototype tests have been made to research on the effects of cohesive strength of filling of cohesive homogeneous earth dam on breach formation. Three breach mechanisms were presented, they were the source-tracing erosion of dam body with the form of "multilevel headcut", "two-helix flow" erosion of dam crest and collapse of breach sidewalls due to instability. It can be concluded that the cohesive strength of filling of earth dam has great effect on breach formation. When the cohesive strength is bigger, the breach process becomes slower, and the peak outflow and the final width and depth of breach become smaller. The main character of the breach formation is head cutting and dumping collapse. When the cohesive strength is smaller, the breach process becomes faster, and the peak outflow, the final width and depth of breach become bigger. The main character of the breach formation is single level head cutting and shearing collapse. 展开更多
关键词 EARTH DAM breach mechanism headcut two-helix FLOW
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Numerical three-dimensional modeling of earthen dam piping failure
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作者 Zhengang Wang 《Water Science and Engineering》 EI CAS CSCD 2024年第1期72-82,共11页
A physically-based numerical three-dimensional earthen dam piping failure model is developed for homogeneous and zoned soil dams.This model is an erosion model,coupled with force/moment equilibrium analyses.Orifice fl... A physically-based numerical three-dimensional earthen dam piping failure model is developed for homogeneous and zoned soil dams.This model is an erosion model,coupled with force/moment equilibrium analyses.Orifice flow and two-dimensional(2D)shallow water equations(SWE)are solved to simulate dam break flows at different breaching stages.Erosion rates of different soils with different construction compaction efforts are calculated using corresponding erosion formulae.The dam's real shape,soil properties,and surrounding area are programmed.Large outer 2D-SWE grids are used to control upstream and downstream hydraulic conditions and control the boundary conditions of orifice flow,and inner 2D-SWE flow is used to scour soil and perform force/moment equilibrium analyses.This model is validated using the European Commission IMPACT(Investigation of Extreme Flood Processes and Uncertainty)Test#5 in Norway,Teton Dam failure in Idaho,USA,and Quail Creek Dike failure in Utah,USA.All calculated peak outflows are within 10%errors of observed values.Simulation results show that,for a V-shaped dam like Teton Dam,a piping breach location at the abutment tends to result in a smaller peak breach outflow than the piping breach location at the dam's center;and if Teton Dam had broken from its center for internal erosion,a peak outflow of 117851 m'/s,which is 81%larger than the peak outflow of 65120 m3/s released from its right abutment,would have been released from Teton Dam.A lower piping inlet elevation tends to cause a faster/earlier piping breach than a higher piping inlet elevation. 展开更多
关键词 3D dam breach model 2D shallow water equations 3D slope stability analysis Piping failure Teton Dam Quail Creek Dike
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A Literature Review: Potential Effects That Health Apps on Mobile Devices May Have on Patient Privacy and Confidentiality
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作者 Anna Sheri George Jomin George Judy Jenkins 《E-Health Telecommunication Systems and Networks》 2024年第3期23-44,共22页
Purpose: This research aims to evaluate the potential threats to patient privacy and confidentiality posed by mHealth applications on mobile devices. Methodology: A comprehensive literature review was conducted, selec... Purpose: This research aims to evaluate the potential threats to patient privacy and confidentiality posed by mHealth applications on mobile devices. Methodology: A comprehensive literature review was conducted, selecting eighty-eight articles published over the past fifteen years. The study assessed data gathering and storage practices, regulatory adherence, legal structures, consent procedures, user education, and strategies to mitigate risks. Results: The findings reveal significant advancements in technologies designed to safeguard privacy and facilitate the widespread use of mHealth apps. However, persistent ethical issues related to privacy remain largely unchanged despite these technological strides. 展开更多
关键词 Mobile Devices Patient Privacy Confidentiality Breaches Data Security Data Protection Regulatory Compliance User Consent Data Encryption Third-Party Integration User Awareness
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Information Security in the Cloud: Emerging Trends and Challenges
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作者 Keerthana Chitreddy Andrew Mikhl Anthony +1 位作者 Chinna Manikanta Bandaru Olatunde Abiona 《International Journal of Communications, Network and System Sciences》 2024年第5期69-80,共12页
This article explores the evolution of cloud computing, its advantages over traditional on-premises infrastructure, and its impact on information security. The study presents a comprehensive literature review covering... This article explores the evolution of cloud computing, its advantages over traditional on-premises infrastructure, and its impact on information security. The study presents a comprehensive literature review covering various cloud infrastructure offerings and security models. Additionally, it deeply analyzes real-life case studies illustrating successful cloud migrations and highlights common information security threats in current cloud computing. The article concludes by offering recommendations to businesses to protect themselves from cloud data breaches and providing insights into selecting a suitable cloud services provider from an information security perspective. 展开更多
关键词 Cloud Computing Information Security Cloud Infrastructure Offerings Cloud Migration Security Measures Data Breaches Cloud Service Providers CYBERSECURITY Cloud Security Case Studies Cloud Threat Landscape Data Encryption COMPLIANCE Cloud Security Tools
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A Review of Cybersecurity Challenges in Small Business: The Imperative for a Future Governance Framework
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作者 Binita Saha Zahid Anwar 《Journal of Information Security》 2024年第1期24-39,共16页
Technological shifts—coupled with infrastructure, techniques, and applications for big data—have created many new opportunities, business models, and industry expansion that benefit entrepreneurs. At the same time, ... Technological shifts—coupled with infrastructure, techniques, and applications for big data—have created many new opportunities, business models, and industry expansion that benefit entrepreneurs. At the same time, however, entrepreneurs are often unprepared for cybersecurity needs—and the policymakers, industry, and nonprofit groups that support them also face technological and knowledge constraints in keeping up with their needs. To improve the ability of entrepreneurship research to understand, identify, and ultimately help address cybersecurity challenges, we conduct a literature review on the state of cybersecurity. The research highlights the necessity for additional investigation to aid small businesses in securing their confidential data and client information from cyber threats, thereby preventing the potential shutdown of the business. 展开更多
关键词 ENTREPRENEURSHIP CYBERSECURITY Small and Medium Businesses Data Breach HACKING Security
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Exploring the Characteristics of Data Breaches: A Descriptive Analytic Study
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作者 Dominik Molitor Aditya Saharia +1 位作者 Viju Raghupathi Wullianallur Raghupathi 《Journal of Information Security》 2024年第2期168-195,共28页
Data breaches have massive consequences for companies, affecting them financially and undermining their reputation, which poses significant challenges to online security and the long-term viability of businesses. This... Data breaches have massive consequences for companies, affecting them financially and undermining their reputation, which poses significant challenges to online security and the long-term viability of businesses. This study analyzes trends in data breaches in the United States, examining the frequency, causes, and magnitude of breaches across various industries. We document that data breaches are increasing, with hacking emerging as the leading cause. Our descriptive analyses explore factors influencing breaches, including security vulnerabilities, human error, and malicious attacks. The findings provide policymakers and businesses with actionable insights to bolster data security through proactive audits, patching, encryption, and response planning. By better understanding breach patterns and risk factors, organizations can take targeted steps to enhance protections and mitigate the potential damage of future incidents. 展开更多
关键词 Cyber Security Information Security Data Breaches Descriptive Analytics PRIVACY Visualization Visual Analytics
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MIKE软件技术在水库溃坝洪水数值模拟中的应用研究
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作者 管静 《水利科技与经济》 2024年第2期109-114,共6页
当前,水库大坝受到超频率的洪水以及强震破坏,而容易导致溃决风险。针对水库大坝溃决相关问题,融合BREACH和MIKE21构建耦合模型,并用于溃坝洪水数值模拟试验。结果表明,7种方案最大下泄流量为方案1的18.39×10^(4) m^(3)/s;方案1洪... 当前,水库大坝受到超频率的洪水以及强震破坏,而容易导致溃决风险。针对水库大坝溃决相关问题,融合BREACH和MIKE21构建耦合模型,并用于溃坝洪水数值模拟试验。结果表明,7种方案最大下泄流量为方案1的18.39×10^(4) m^(3)/s;方案1洪峰向地点C汇入点的洪水最大流量比邢台坝址下降约44%。方案1的溃坝洪水水位始终最高,A地最高为306m。综合来看,耦合模型在水库溃坝洪水数值模拟中具备有效性,在实际的水库防洪避险中具备实用性。 展开更多
关键词 MIKE21 溃坝洪水 BREACH模型 溃口流量
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基于一维、二维耦合水动力模型的水库溃坝洪水演进分析
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作者 邵广哲 李云瑶 +1 位作者 宋利祥 张雪 《大坝与安全》 2024年第6期61-67,共7页
溃坝是一种低概率、高致灾风险的突发性事件,溃坝洪水风险图是减轻下游洪水淹没损失的重要非工程措施。以广东省南水水库为例,利用HydroMPM软件建立一维、二维耦合洪水演进模型,并结合BREACH模型计算土石坝溃口流量过程,模拟非汛期管涌... 溃坝是一种低概率、高致灾风险的突发性事件,溃坝洪水风险图是减轻下游洪水淹没损失的重要非工程措施。以广东省南水水库为例,利用HydroMPM软件建立一维、二维耦合洪水演进模型,并结合BREACH模型计算土石坝溃口流量过程,模拟非汛期管涌溃决、汛期管涌溃决和漫坝溃决三种工况下溃坝洪水的传播过程。结果表明,水库一旦失事,溃坝洪水急剧下泄、峰高量大、冲击力强,将使下游承受严重的洪水淹没损失。溃坝洪水淹没范围等成果可为下游群众转移、洪水预警提供技术依据。 展开更多
关键词 溃坝洪水 HydroMPM软件 BREACH模型 洪水演进模拟 淹没范围
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Cyberattack Ramifications, The Hidden Cost of a Security Breach
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作者 Meysam Tahmasebi 《Journal of Information Security》 2024年第2期87-105,共19页
In this in-depth exploration, I delve into the complex implications and costs of cybersecurity breaches. Venturing beyond just the immediate repercussions, the research unearths both the overt and concealed long-term ... In this in-depth exploration, I delve into the complex implications and costs of cybersecurity breaches. Venturing beyond just the immediate repercussions, the research unearths both the overt and concealed long-term consequences that businesses encounter. This study integrates findings from various research, including quantitative reports, drawing upon real-world incidents faced by both small and large enterprises. This investigation emphasizes the profound intangible costs, such as trade name devaluation and potential damage to brand reputation, which can persist long after the breach. By collating insights from industry experts and a myriad of research, the study provides a comprehensive perspective on the profound, multi-dimensional impacts of cybersecurity incidents. The overarching aim is to underscore the often-underestimated scope and depth of these breaches, emphasizing the entire timeline post-incident and the urgent need for fortified preventative and reactive measures in the digital domain. 展开更多
关键词 Artificial Intelligence (AI) Business Continuity Case Studies Copyright Cost-Benefit Analysis Credit Rating Cyberwarfare Cybersecurity Breaches Data Breaches Denial Of Service (DOS) Devaluation Of Trade Name Disaster Recovery Distributed Denial of Service (DDOS) Identity Theft Increased Cost to Raise Debt Insurance Premium Intellectual Property Operational Disruption Patent Post-Breach Customer Protection Recovery Point Objective (RPO) Recovery Time Objective (RTO) Regulatory Compliance Risk Assessment Service Level Agreement Stuxnet Trade Secret
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United States Healthcare Data Breaches: Insights for NIST SP 800-66 Revision 2 from a Review of the NIST SP 800-66 Revision 1
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作者 Mohammed Mohammed Raoof 《Journal of Information Security》 2024年第2期232-244,共13页
Healthcare security and privacy breaches are occurring in the United States (US), and increased substantially during the pandemic. This paper reviews the National Institute of Standards and Technology (NIST) publicati... Healthcare security and privacy breaches are occurring in the United States (US), and increased substantially during the pandemic. This paper reviews the National Institute of Standards and Technology (NIST) publication base as an effective solution. The NIST Special Publication 800-66 Revision 1 was an essential standard in US healthcare, which was withdrawn in February 2024 and superseded by SP 800-66 Revision 2. This review investigates the academic papers concerning the application of the NIST SP 800-66 Revision 1 standard in the US healthcare literature. A systematic review method was used in this study to determine current knowledge gaps of the SP 800-66 Revision 1. Some limitations were employed in the search to enforce validity. A total of eleven articles were found eligible for the study. Consequently, this study suggests the necessity for additional academic papers pertaining to SP 800-66 Revision 2 in the US healthcare literature. In turn, it will enhance awareness of safeguarding electronic protected health information (ePHI), help to mitigate potential future risks, and eventually reduce breaches. 展开更多
关键词 SP 800-66 Revision 1 SP 800-66 Revision 2 HIPAA Compliance Security Breaches Risk Management Framework (RMF) Internet of Things (IoT) Artificial Intelligence (AI)
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两种溃坝模型在唐家山堰塞湖溃决模拟中的对比 被引量:22
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作者 李相南 陈祖煜 《水利水电科技进展》 CSCD 北大核心 2017年第2期20-26,共7页
基于唐家山堰塞坝溃决的实测数据,使用BREACH模型及中国水科院DB-IWHR模型,对唐家山堰塞坝溃决过程进行了反演分析,并对两种模型进行参数敏感性分析。研究结果表明:使用针对唐家山的参数,两种模型均可较好地反演唐家山溃决洪水的过程,BR... 基于唐家山堰塞坝溃决的实测数据,使用BREACH模型及中国水科院DB-IWHR模型,对唐家山堰塞坝溃决过程进行了反演分析,并对两种模型进行参数敏感性分析。研究结果表明:使用针对唐家山的参数,两种模型均可较好地反演唐家山溃决洪水的过程,BREACH模型的下游坡比和孔隙率是对结果影响比较敏感的输入参数;DB-IWHR模型在冲刷参数和下游水深计算两方面做了改善,较好地解决了这一问题;DB-IWHR提供了一个Excel格式的计算软件,数值分析稳定性好,使用简洁客观,可供类似堰塞湖应急处置时参考。 展开更多
关键词 堰塞湖 BREACH模型 DB-IWHR模型 溃坝洪水分析 唐家山
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基于NWS BREACH的唐家山堰塞坝泄流过程模拟 被引量:1
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作者 刘若星 钟启明 霍家平 《人民长江》 北大核心 2016年第3期88-92,共5页
NWS BREACH模型是目前国内外模拟土石坝或堰塞坝漫顶及管涌破坏最常用的数学模型。基于唐家山堰塞坝的实测资料,建立了唐家山堰塞坝漫顶泄流过程数学模型,并通过现场监测得到的流量过程和库水位变化资料验证了所建立模型的合理性。对模... NWS BREACH模型是目前国内外模拟土石坝或堰塞坝漫顶及管涌破坏最常用的数学模型。基于唐家山堰塞坝的实测资料,建立了唐家山堰塞坝漫顶泄流过程数学模型,并通过现场监测得到的流量过程和库水位变化资料验证了所建立模型的合理性。对模型中的重要参数进行了敏感性分析,研究了坝料平均粒径、冲蚀率、下游坝坡坡比3个参数对模型计算结果的影响,表明坝料冲蚀率和下游坝坡坡比对泄流过程影响显著。研究成果对堰塞坝除险和洪水风险评估具有指导意义。 展开更多
关键词 NWS BREACH模型 唐家山堰塞坝 泄流模拟 敏感性分析
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改良Breach法治疗腋臭8例 被引量:7
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作者 韩承新 《武警医学》 CAS 2000年第1期22-22,共1页
关键词 腋臭 改良Breach法 外科手术 治疗
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