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Automated Service Search Model for the Social Internet of Things

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Computers, Materials & Continua 2022年第9期72卷 5871-5888页

作者： Farhan Amin seong Oun hwang Department of Computer Engineering Gachon UniversitySeongnam13120Korea

The social internet of things(SIoT)is one of the emerging paradigms that was proposed to solve the problems of network service discovery,navigability,and service *** SIoT aims to socialize the IoT devices and shape the interconnection between them into social interaction just like human *** IoT,an object can offer multiple services and different objects can offer the same services with different parameters and interest *** proliferation of offered services led to difficulties during service customization and service *** problem is known as service *** selection of suitable service that fits the requirements of applications and objects is a challenging *** address these issues,we propose an efficient automated query-based service search model based on the local network navigability concept for the *** the proposed model,objects can use information from their friends or friends of their friends while searching for the desired services,rather than exploring a global *** employ a centrality metric that computes the degree of importance for each object in the social IoT that helps in selecting neighboring objects with high centrality *** distributed nature of our navigation model results in high scalability and short navigation *** verified the efficacy of our model on a real-world SIoT-related *** experimental results confirm the validity of our model in terms of scalability,navigability,and the desired objects that provide services are determined quickly via the shortest path,which in return improves the service search process in the SIoT.

关键词： Social internet of things service discovery local navigability object discovery query generation model

A probabilistic model of quantum states for classical data security

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Frontiers of physics 2023年第5期18卷 281-292页

作者： Muhammad Waseem Hafiz seong Oun hwang Department of IT Convergence Engineering Gachon UniversitySeongnam 13120South Korea Department of Computer Engineering Gachon UniversitySeongnam 13120South Korea

The phenomenal progress of quantum information theory over the last decade has substantially broadened the potential to simulate the superposition of states for exponential speedup of quantum algorithms over their classical ***,the conventional and modern cryptographic standards(encryption and authentication)are susceptible to Shor’s and Grover’s algorithms on quantum *** significant improvement in technology permits consummate levels of data protection by encoding classical data into small quantum states that can only be utilized once by leveraging the capabilities of quantum-assisted classical *** the frequent data breaches and increasingly stringent privacy legislation,we introduce a hybrid quantum-classical model to transform classical data into unclonable states,and we experimentally demonstrate perfect state transfer to exemplify the classical *** alleviate implementation complexity,we propose an arbitrary quantum signature scheme that does not require the establishment of entangled states to authenticate users in order to transmit and receive arbitrated states to retrieve classical *** consequences of the probabilistic model indicate that the quantum-assisted classical framework substantially enhances the performance and security of digital data,and paves the way toward real-world applications.

关键词： information security quantum-classical cryptography quantum information processing quantum spin states spin-1/2 algebra user authentication

An Enhanced Privacy Preserving, Secure and Efficient Authentication Protocol for VANET

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Computers, Materials & Continua 2022年第5期71卷 3703-3719页

作者： Safiullah Khan Ali Raza seong Oun hwang Department of IT Convergence Engineering Gachon UniversitySeongnam13320Korea ENSAIT GEMTEX-Laboratoire de Genie et Materiaux TextilesUniversity of LilleLilleF59000France School of Computing&Institute of Cyber Security(ICSS) University of KentUnited Kingdom Department of Computer Engineering Gachon UniversitySeongnam13320Korea

Vehicular ad hoc networks (VANETs) have attracted growing interest in both academia and industry because they can provide a viable solutionthat improves road safety and comfort for travelers on roads. However, wireless communications over open-access environments face many security andprivacy issues that may affect deployment of large-scale VANETs. Researchershave proposed different protocols to address security and privacy issues in aVANET, and in this study we cryptanalyze some of the privacy preservingprotocols to show that all existing protocols are vulnerable to the Sybilattack. The Sybil attack can be used by malicious actors to create fakeidentities that impair existing protocols, which allows them to imitate trafficcongestion or at worse cause an accident that may result in the loss of humanlife. This vulnerability exists because those protocols store vehicle identitiesin an encrypted form, and it is not possible to search over the encryptedidentities to find fake vehicles. This attack is serious in nature and veryprevalent for privacy-preserving protocols. To cope with this kind of attack,we propose a novel and practical protocol that uses Public key encryptionwith an equality test (PKEET) to search over the encrypted identities withoutleaking any information, and eventually eliminate the Sybil attack. Theproposed approach improves security and at the same time maintains privacyin VANET. Our performance analysis indicates that the proposed protocoloutperforms state-of-the-art protocols: The proposed beacon generation timeis constant compared to a linear increase in existing protocols, with beaconverification shown to be faster by 7.908%. Our communicational analysisshows that the proposed protocol with a beacon size of 322 bytes has the leastcommunicational overhead compared to other state-of-the-art protocols.

关键词： VANET authentication protocol cryptanalysis privacy preserving intelligent systems

Duplication of the common bile duct manifesting as recurrent pyogenic cholangitis:A case report

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World Journal of Gastroenterology 2021年第4期27卷 371-376页

作者： Jun seong hwang Sung Woo Ko Internal Medicine Inje University Haeundae Paik HospitalInje College of MedicineBusan 48108South Korea Internal Medicine Eunpyeong St.Mary's HospitalCatholic University of KoreaSeoul 03312South Korea

BACKGROUND Duplication of the extrahepatic bile duct(DCBD)is an extremely rare congenital anomaly of the biliary *** are five types of DCBD according to the latest *** them,Type V is characterized by single drainage of the extrahepatic bile *** on DCBD Type V are *** SUMMARY A 77-year-old woman presented with recurrent epigastric pain but without fever or *** tomography revealed a dilated common bile duct(CBD)that harboured multiple *** retrograde cholangiopancreatography(ERCP)was performed,and the stones were extracted using a Dormia *** was discharged without any complications;however,she visited the emergency department a day after she was discharged due to epigastric pain and *** findings were suggestive of *** urgent ERCP for stone removal,magnetic resonance cholangiopancreatography was performed to evaluate remnant *** resonance cholangiopancreatography revealed a DCBD Type Va and remnant choledocholithiasis in the right *** CBDs were accessed,and the stones were cleared successfully during a subsequent *** In this article,we report an extremely rare case of DCBD manifesting as recurrent pyogenic *** case highlights the importance of recognizing DCBD because stones in the unrecognized bile duct could make the patient’s prognosis critical.

关键词： Double common bile duct Common bile duct disease Choledocholithiasis Cholangitis Endoscopic retrograde cholangiopancreatography Case report

Quantum logic operations on two distant atoms trapped in two optical-fibre-connected cavities

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Chinese Physics B 2011年第12期20卷 88-94页

作者：张英俏张寿 Yeon Kyu-hwang Yu seong-Cho Department of Physics College of ScienceYanbian University BK21 Physics Program and Department of Physics College of Natural SciencesChungbuk National UniversityCheongjuChungbuk361-763Republic of Korea

Based on the coupling of two distant three-level atoms in two separate optical cavities connected with two optical fibres, schemes on the generation of several two-qubit logic gates are discussed under the conditions of △ = δ- 2v cos πk/2 〉〉 g/2 and v-g. Discussion and analysis of the fidelity, gate time and experimental setups show that our schemes are feasible with current optical cavity, atomic trap and optical fibre techniques. Moreover, the atom-cavityfibre coupling can be used to generate an N-qubit nonlocal entanglement and transfer quantum information among N distant atoms by arranging N atom cavity assemblages in a line and connecting each two adjacent cavities with two optical fibres.

关键词： quantum logic gate cavity QED optical fibre

Incorporation of Ionic Conductive Polymers into Sulfide Electrolyte-Based Solid-State Batteries to Enhance Electrochemical Stability and Cycle Life

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Energy & Environmental Materials 2024年第6期7卷 4-12页

作者： Juhyoung Kim Woonghee Choi seong-Ju hwang Dong Wook Kim Advanced Materials Division Korea Research Institute of Chemical Technology(KRICT)Daejeon 34114Korea Department of Material Science and Engineering Yonsei UniversitySeoul 03722Korea Department of Material Science and Engineering Seoul National UniversitySeoul 08826Korea Advanced Materials and Chemical Engineering University of Science and Technology(UST)Daejeon 34113Korea

Sulfide-based inorganic solid electrolytes are promising materials for high-performance safe solid-state *** high ion conductivity,mechanical characteristics,and good processability of sulfide-based inorganic solid electrolytes are desirable properties for realizing high-performance safe solid-state batteries by replacing conventional liquid ***,the low chemical and electrochemical stability of sulfide-based inorganic solid electrolytes hinder the commercialization of sulfide-based safe solid-state ***,the instability of sulfide-based inorganic solid electrolytes is intensified in the cathode,comprising various *** this study,carbonate-based ionic conductive polymers are introduced to the cathode to protect cathode materials and suppress the reactivity of sulfide *** instruments,including electrochemical spectroscopy,X-ray photoelectron spectroscopy,and scanning electron microscopy,confirm the chemical and electrochemical stability of the polymer electrolytes in contact with sulfide-based inorganic solid ***-based solid-state cells show stable electrochemical performance over 100 cycles when the ionic conductive polymers were applied to the cathode.

关键词： composite cathode electrochemical stability ionic conductive polymer solid-state battery sulfide solid electrolyte

Lightweight design of 45000r/min spindle using full factorial design and extreme vertices design methods

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Journal of Central South University 2011年第1期18卷 153-158页

作者： PARK seong-jin LEE Choon-man hwang Young-kug Department of Mechanical Design and Manufacturing Engineering Changwon National University

Factors for determining the spindle size are the shaft diameter, positions of bearing and motor, and entire length of the spindle. Then, it is important to find the assembling of the optimal design variables, which satisfy the stiffimss and rotational speed required to the spindle. A general full factorial design method was used to verify some factors that affect the natural frequency of a spindle. It is verified that the shorter shaft length and bearing span length represent the higher natural frequency, and there are some effects according to the change in the levels of factors. The detailed spindle dimension is determined by applying an EVD method, which can define the optimal bearing position through considering the limiting condition. Based on the estimated regression model, the optimal spindle size and bearing distance that can improve the primary natural frequency are obtained, and the influence of design factors on the natural frequency is also analyzed.

关键词： high-speed spindle extreme vertices design natural frequency lightweight design full factorial design

Amine functionalization on thermal and mechanical behaviors of graphite nanofibers-loaded epoxy composites

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Journal of Materials Science & Technology 2023年第20期151卷 80-88页

作者： seong-hwang Kim Sang-Jin Park Seul-Yi Lee Soo-Jin Park Department of Chemistry Inha University100 InharoIncheon 22212the Republic of Korea

With the growing demand for faster and more powerful computing,effective heat dissipation is essential to ensure the longevity,reliability,and high performance of electronic *** the field of modern electronic packaging materials,there is a great need for graphitic material-loaded polymeric composites(GPCs)with excellent thermal ***,the enhancement efficiency of GPCs is hindered by the agglomeration of fillers and the interfacial thermal resistance caused by the lack of continuous thermally conductive pathways between the filler and *** the interfaces between filler and matrix is of great importance in optimizing the performances of ***,we fabricated graphite nanofibers(GNF)-loaded nanocomposites using acid-functionalized GNF(AGNF)and acidtetraethylenepentamine-functionalized(TGNF)as a filler and epoxy resin as a matrix with different GNF loading contents to explore the interfacial properties of the *** optimal GNF loading for AGNF was 0.5 wt.%,while the TGNF showed 0.75 wt.%.The highest thermal conductivity(0.51 W m^(−1) K^(−1))and fracture toughness(25.8 MPa m^(1/2))values were found in the TGNF-loaded nanocomposites with a fraction of 0.75 wt.%,representing enhancements of∼145%and∼400%,respectively,compared to those of neat *** experimental data presented herein demonstrate that the interfacial properties play a significant role in enhancing the thermal and mechanical performances of the *** present approach is expected to serve as a valuable tool in the design of conductive polymeric nanocomposites for further practical applications,such as thermal interface materials and packaging of high-power electric devices.

关键词： Graphite nanofiber Nanocomposites Interfacial interaction Thermal conductivity Fracture resistance

Visual outcomes after three different surgical procedures for correction of refractive error in patients with thin corneas

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International Journal of Ophthalmology(English edition) 2020年第6期13卷 970-977页

作者： Hye seong hwang Hyun Jeong Lee seong Jun Lee Jae-Hyung Kim Department of Ophthalmology Chungbuk National UniversityCheongjuChunbguk 28644Republic of Korea Korean Minjok Leadership Academy HoengseongGangwon 25268Republic of Korea Nuri Eye Clinic Daejeon 35234Republic of Korea Seoul Daabom Eye Center CheoungjuChungbuk 28644Republic of Korea

AIM:To investigate and compare the visual and refractive outcomes of small incision lenticule extraction(SMILE),laser assisted sub-epithelial keratomileusis(LASEK),and LASEK combined with corneal collagen cross-linking(LASEKCXL)surgery in patients with less than 500μm of central corneal thickness(CCT).METHODS:The retrospective medical records review was conducted on the patients with CCT less than 500μm treated with SMILE,LASEK,and *** was a total of 172 eyes,76 eyes were in the SMILE group,53 eyes in the LASEK group,and 43 eyes in the LASEK-CXL *** distance visual acuity(UDVA),spherical equivalent refraction(SE),and corneal haze were followed up in the three groups for 12 ***:At 12 mo postoperatively,there were no statistically significant differences in UDVA and in the absolute value of SE between the three *** predictability within±0.50 D in the SMILE group(85.5%)was significantly higher than in both the LASEK group(64.2%,P<0.01)and the LASEK-CXL group(69.8%,P=0.04).The efficacy index and safety index were not significantly different among the three *** haze at 12 mo postoperatively was higher in the LASEK-CXL group(27.9%)than in the SMILE group(2.6%,P<0.01)and in the LASEK group(7.5%,P<0.01).CONCLUSION:In patients with CCT less than 500μm,SMILE,LASEK,and LASEK-CXL appear to be effective for myopic *** them,SMILE surgery shows the highest predictability.

关键词： small incision lenticule extraction thin cornea laser assisted sub-epithelial keratomileusis collagen-cross linking visual acuity myopia