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A New Encryption Mechanism Supporting the Update of Encrypted Data for Secure and Efficient Collaboration in the Cloud Environment

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Computer Modeling in Engineering & Sciences 2025年第1期142卷 813-834页

作者： Chanhyeong Cho Byeori Kim Haehyun Cho taek-Young Youn Department of Cyber Security Dankook UniversityYongin16890Republic of Korea Department of Software Soongsil UniversitySeoul07027Republic of Korea

With the rise of remote collaboration,the demand for advanced storage and collaboration tools has rapidly ***,traditional collaboration tools primarily rely on access control,leaving data stored on cloud servers vulnerable due to insufficient *** paper introduces a novel mechanism that encrypts data in‘bundle’units,designed to meet the dual requirements of efficiency and security for frequently updated collaborative *** bundle includes updated information,allowing only the updated portions to be reencrypted when changes *** encryption method proposed in this paper addresses the inefficiencies of traditional encryption modes,such as Cipher Block Chaining(CBC)and Counter(CTR),which require decrypting and re-encrypting the entire dataset whenever updates *** proposed method leverages update-specific information embedded within data bundles and metadata that maps the relationship between these bundles and the plaintext *** utilizing this information,the method accurately identifies the modified portions and applies algorithms to selectively re-encrypt only those *** approach significantly enhances the efficiency of data updates while maintaining high performance,particularly in large-scale data *** validate this approach,we conducted experiments measuring execution time as both the size of the modified data and the total dataset size *** show that the proposed method significantly outperforms CBC and CTR modes in execution speed,with greater performance gains as data size ***,our security evaluation confirms that this method provides robust protection against both passive and active attacks.

关键词： Cloud collaboration mode of operation data update efficiency

Novel Perovskite Oxide Hybrid Nanofibers Embedded with Nanocatalysts for Highly Efficient and Durable Electrodes in Direct CO_(2) Electrolysis

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Nano-Micro Letters 2024年第5期16卷 214-230页

作者： Akromjon Akhmadjonov Kyung taek Bae Kang taek lee Department of Mechanical Engineering KAISTDaejeon 34141Republic of Korea KAIST Graduate School of Green Growth and Sustainability Daejeon 34141Republic of Korea

The unique characteristics of nanofibers in rational electrode design enable effec-tive utilization and maximizing material properties for achieving highly efficient and sustainable CO_(2) reduction reactions( CO_(2)RRs)in solid oxide elec-trolysis cells(SOECs).However,practical appli-cation of nanofiber-based electrodes faces chal-lenges in establishing sufficient interfacial contact and adhesion with the dense *** tackle this challenge,a novel hybrid nanofiber electrode,La_(0.6)Sr_(0.4)Co_(0.15)Fe_(0.8)Pd_(0.05)O_(3-δ)(H-LSCFP),is developed by strategically incorporating low aspect ratio crushed LSCFP nanofibers into the excess porous interspace of a high aspect ratio LSCFP nanofiber framework synthesized via electrospinning *** consecutive treatment in 100% H_(2) and CO_(2) at 700°C,LSCFP nanofibers form a perovskite phase with in situ exsolved Co metal nanocatalysts and a high concentration of oxygen species on the surface,enhancing CO_(2) *** SOEC with the H-LSCFP electrode yielded an outstanding current density of 2.2 A cm^(-2) in CO_(2) at 800°C and 1.5 V,setting a new benchmark among reported nanofiber-based *** twinning of the H-LSCFP reveals improved contact adhesion and increased reaction sites for CO_(2)*** present work demonstrates a highly catalytically active and robust nanofiber-based fuel electrode with a hybrid structure,paving the way for further advancements and nanofiber applications in CO_(2)-SOECs.

关键词： Nanofibers Fuel electrodes Digital twinning CO_(2)reduction reaction Solid oxide electrolysis cells

Topic Modeling Based Warning Prioritization from Change Sets of Software Repository

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Journal of Computer Science & Technology 2020年第6期35卷 1461-1479页

作者： Jung-Been lee taek lee Hoh Peter In College of Informatics Korea UniversitySeoul 02841Korea College of Knowledge-Based Services Engineering Sungshin UniversitySeoul 02844Korea

Many existing warning prioritization techniques seek to reorder the static analysis warnings such that true positives are provided first. However, excessive amount of time is required therein to investigate and fix prioritized warnings because some are not actually true positives or are irrelevant to the code context and topic. In this paper, we propose a warning prioritization technique that reflects various latent topics from bug-related code blocks. Our main aim is to build a prioritization model that comprises separate warning priorities depending on the topic of the change sets to identify the number of true positive warnings. For the performance evaluation of the proposed model, we employ a performance metric called warning detection rate, widely used in many warning prioritization studies, and compare the proposed model with other competitive techniques. Additionally, the effectiveness of our model is verified via the application of our technique to eight industrial projects of a real global company.

关键词： automated static analysis topic modeling warning prioritization

Programmable Logic Controller Block Monitoring System for Memory Attack Defense in Industrial Control Systems

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Computers, Materials & Continua 2023年第11期77卷 2427-2442页

作者： Mingyu lee Jiho Shin Jung taek Seo Department of Information Security Gachon UniversitySeongnam13120Korea Police Science Institute Korean National Police UniversityAsan31539Korea Department of Computer Engineering Gachon UniversitySeongnam13120Korea

Cyberattacks targeting industrial control systems(ICS)are becoming more sophisticated and advanced than in the past.A programmable logic controller(PLC),a core component of ICS,controls and monitors sensors and actuators in the ***,PLC has memory attack threats such as program injection and manipulation,which has long been a major target for attackers,and it is important to detect these attacks for ICS *** detect PLC memory attacks,a security system is required to acquire and monitor PLC memory *** addition,the performance impact of the security system on the PLC makes it difficult to apply to the *** address these challenges,this paper proposes a system to detect PLC memory attacks by continuously acquiring and monitoring PLC *** proposed system detects PLC memory attacks by acquiring the program blocks and block information directly from the same layer as the PLC and then comparing them in bytes with previous *** with Siemens S7-300 and S7-400 PLC were conducted to evaluate the PLC memory detection performance and performance impact on *** experimental results demonstrate that the proposed system detects all malicious organization block(OB)injection and data block(DB)manipulation,and the increment of PLC cycle time,the impact on PLC performance,was less than 1 *** proposed system detects PLC memory attacks with a simpler detection method than earlier ***,the proposed system can be applied to ICS with a small performance impact on PLC.

关键词： Programmable logic controller industrial control system attack detection

Development of vehicle-recognition method on water surfaces using LiDAR data:SPD^(2)(spherically stratified point projection with diameter and distance)

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Defence Technology（防务技术） 2024年第6期36卷 95-104页

作者： Eon-ho lee Hyeon Jun Jeon Jinwoo Choi Hyun-taek Choi Sejin lee The Department of Mechanical Engineering Kongju National University1223-24 Cheonan-daeroCheonan 31080Republic of Korea Ocean System Engineering Research Division Korea Research Institute of Ships and Ocean Engineering(KRISO)Daejeon 34103Republic of Korea The Division of Mechanical&Automotive Engineering Kongju National University1223-24 Cheonan-daeroCheonan 31080Republic of Korea

Swarm robot systems are an important application of autonomous unmanned surface vehicles on water *** monitoring natural environments and conducting security activities within a certain range using a surface vehicle,the swarm robot system is more efficient than the operation of a single object as the former can reduce cost and save *** is necessary to detect adjacent surface obstacles robustly to operate a cluster of unmanned surface *** this purpose,a LiDAR(light detection and ranging)sensor is used as it can simultaneously obtain 3D information for all directions,relatively robustly and accurately,irrespective of the surrounding environmental *** the GPS(global-positioning-system)error range exists,obtaining measurements of the surface-vessel position can still ensure stability during platoon *** this study,a three-layer convolutional neural network is applied to classify types of surface *** aim of this approach is to redefine the sparse 3D point cloud data as 2D image data with a connotative meaning and subsequently utilize this transformed data for object classification ***,we have proposed a descriptor that converts the 3D point cloud data into 2D image *** use this descriptor effectively,it is necessary to perform a clustering operation that separates the point clouds for each *** developed voxel-based clustering for the point cloud ***,using the descriptor,3D point cloud data can be converted into a 2D feature image,and the converted 2D image is provided as an input value to the *** intend to verify the validity of the proposed 3D point cloud feature descriptor by using experimental data in the ***,we explore the feasibility of real-time object classification within this framework.

关键词： Object classification Clustering 3D point cloud data LiDAR(light detection and ranging) Surface vehicle

Solar Power Plant Network Packet-Based Anomaly Detection System for Cybersecurity

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Computers, Materials & Continua 2023年第10期77卷 757-779页

作者： Ju Hyeon lee Jiho Shin Jung taek Seo Department of Information Security Gachon UniversitySeongnam13120Korea Police Science Institute Korean National Police UniversityAsan31539Korea Department of Computer Engineering Gachon UniversitySeongnam13120Korea

As energy-related problems continue to emerge,the need for stable energy supplies and issues regarding both environmental and safety require urgent *** energy is becoming increasingly important,with solar power accounting for the most significant proportion of *** the scale and importance of solar energy have increased,cyber threats against solar power plants have also ***,we need an anomaly detection system that effectively detects cyber threats to solar power ***,as mentioned earlier,the existing solar power plant anomaly detection system monitors only operating information such as power generation,making it difficult to detect *** address this issue,in this paper,we propose a network packet-based anomaly detection system for the Programmable Logic Controller(PLC)of the inverter,an essential system of photovoltaic plants,to detect cyber *** and vulnerabilities in solar power plants were analyzed to identify cyber threats in solar power *** analysis shows that Denial of Service(DoS)and Manin-the-Middle(MitM)attacks are primarily carried out on inverters,aiming to disrupt solar plant *** develop an anomaly detection system,we performed preprocessing,such as correlation analysis and normalization for PLC network packets data and trained various machine learning-based classification models on such *** Random Forest model showed the best performance with an accuracy of 97.36%.The proposed system can detect anomalies based on network packets,identify potential cyber threats that cannot be identified by the anomaly detection system currently in use in solar power plants,and enhance the security of solar plants.

关键词： Renewable energy solar power plant cyber threat cybersecurity anomaly detection machine learning network packet

Agmatine reduces nitric oxide synthase expression and peroxynitrite formation in the cerebral cortex in a rat model of transient global cerebral ischemia

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Neural Regeneration Research 2010年第23期5卷 1773-1781页

作者： Chin Hee Mun Won taek lee Kyung Ah Park Jong Eun lee Department of Anatomy Yonsei University College of Medicine Brain Korea 21 Project for Medical Science Yonsei University College of Medicine

Agmatine, an analog of L-arginine, is an endogenous substance synthesized by arginine decarboxylase, which has been shown to possess neuroprotective effects following brain ischemia. Nitric oxide is generated by sequential oxidation of the guanidinium group in L-arginine, and agmatine might protect the brain from ischemic injury by interfering with nitric oxide signaling. This study investigated the effects of agmatine on cerebral cortex neuronal injury following transient global cerebral ischemia and also detected nitric oxide synthase expression and peroxynitrite formation. Results demonstrated that intraperitoneal injection of agmatine in global cerebral ischemia/reperfusion alleviated ischemia/reperfusion-induced cerebral cortical cortex neuronal injury and cellular apoptosis, decreased neuronal and inducible nitric oxide synthase expression at 24, 48, and 72 hours following global cerebral ischemia and reperfusion, and greatly inhibited nitrotyrosine levels, which reflect the amount of peroxynitrite formed. These findings indicated that agmatine alleviates cerebral cortex neuronal injury following global cerebral ischemia and decreases nitric oxide synthase expression and peroxynitrite formation following ischemia/repeffusion.

关键词： agmatine global cerebral ischemia cerebral cortex nitric oxide nitric oxide synthase neuroprotection

Transanal minimally invasive surgery using laparoscopic instruments of the rectum:A review

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World Journal of Gastrointestinal Surgery 2021年第10期13卷 1149-1165页

作者： Myung Jo Kim taek-Gu lee Department of Surgery Chungbuk National University HospitalChungbuk National University College of MedicineCheongju 28644South Korea

Transanal minimally invasive surgery(TAMIS)was first described in 2010 as an alternative to transanal endoscopic microsurgery(TEM).The TAMIS technique can be access to the proximal and mid-rectum for resection of benign and earlystage malignant rectal lesions and also used for noncurative intent surgery of more advanced lesions in patients who are not candidates for radical *** has a shorter learning curve,reduced device setup time,flexibility in instrument use,and versatility in application than ***,TAMIS shows similar results in a view of the operation time,conversion rate,reoperation rate,and complication to *** these reasons,TAMIS is an easily accessible,technically feasible,and cost-effective alternative to ***,TAMIS has enabled the performance of high-quality local excision of rectal lesions by many colorectal *** TAMIS becomes more broadly utilized such as pelvic abscess drainage,rectal stenosis,and treatment of anastomotic dehiscence,the acquisition of appropriate training must be ensured,and the continued assessment and assurance of outcome must be maintained.

关键词： Transanal minimally invasive Rectal cancer Laparoscopic transanal excision Endoscopic resection Minimally invasive surgery Transanal endoscopic microsurgery

Preface: Nano/Micro Structures in Application of Computational Mechanics

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Computer Modeling in Engineering & Sciences 2019年第8期120卷 235-237页

作者： Chang-Chun lee Nien-Ti Tsou taek-Soo Kim Department of Power Mechanical Engineering National Tsing Hua UniversityHsinchu 30013Taiwan Department of Material Science and Engineering National Chiao Tung UniversityHsinchu 30013Taiwan Department of Mechanical Engineering KAISTDaejeon 34141Korea

Many important issues of structures,such as lattice mismatch,compatibility,orientation,evolution,phase transition,surfaces,interfaces,defects,and domain engineering,have attracted considerable *** corresponding mechanisms of these issues have not been fully *** mechanics has been widely used to investigate such complexities in nano/microstructures in recent *** this special issue,leading experts in their respective fields are invited to present their new insight into the theoretical calculation and modeling of nano/*** articles are collected.A brief introduction on each article is provided below.

关键词： compatibility insight mechanisms