Updated on 2026/03/16

写真a

 
LIU YI
 
Organization
Faculty of Information Engineering Department of Information and Communication Engineering Associate Professor
Graduate School of Engineering Master's program Communication and Information Networking Associate Professor
Title
Associate Professor
Contact information
メールアドレス

Degree

  • 博士 ( 福岡工業大学 )

Research Interests

  • P2Pシステム ファジィ理論 コンピュータネットワーク 故障予兆管理 無線通信

Research Areas

  • Informatics / Information networks

Education

  • Fukuoka Institute of Technology

Research History

  • Fukuoka Institute of Technology   Faculty of Information Engineering Department of Information and Communication Engineering

    2025.4

  • Fukuoka Institute of Technology   Associate Professor

    2025.4

  • Oita National College of Technology

    2020.4 - 2025.3

  • Oita National College of Technology   Assistant Professor

    2020.4 - 2025.3

  • Fukuoka Institute of Technology

    2019.4 - 2020.3

  • The University of Kitakyushu

    2018.4 - 2019.9

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Professional Memberships

  • IEEE

    2018.1

Papers

  • Design and performance comparison of two implemented trust evaluation models for fifth generation (5G) and beyond 5G (B5G) network slicing using an interval type-2 fuzzy logic system

    Higashi S., Kraikritayakul P., Liu Y., Ikeda M., Matsuo K., Barolli L.

    Journal of High Speed Networks   32 ( 1 )   37 - 59   2026.2

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    Publisher:Journal of High Speed Networks  

    Trust evaluation for fifth generation (5G) and beyond 5G (B5G) network slicing has become increasingly critical due to the complexity of multi-tenant orchestration, dynamic resource allocation, and strict quality of service (QoS) requirements. However, conventional trust evaluation methods cannot capture the uncertainty coming from measurement noise, linguistic ambiguity, and dynamic network conditions. In this paper, we propose a fuzzy-based system for slice trust evaluation (FSSTE) designed for 5G/B5G network slicing environments. We implement two models: FSSTEM1 and FSSTEM2. FSSTEM1 considers three input parameters: QoS, security posture (SP), and isolation integrity (II), while FSSTEM2 extends this framework by incorporating resource reliability (RR) as a fourth parameter. Both models use interval type-2 fuzzy logic system to decide the slice trust (ST) output value. We evaluated the implemented models by simulations and found that when QoS, SP, II, and RR values increase, the ST value increases consistently. For FSSTEM1, when all parameters reach 0.9, the ST value is 0.868, which is suitable for mission-critical applications. For FSSTEM2, the RR provides 21% trust improvement under poor QoS conditions, which is suitable for safety-critical deployments. Parameter sensitivity analysis for FSSTEM1 shows that QoS and II have the same impact on ST (0.251). While SP has a stronger impact (0.257) compared with QoS and II. For FSSTEM2, the higher maximum footprint uncertainty of FSSTEM2 (0.249 vs. 0.190) suggests that four-parameters assessment involves greater uncertainty. FSSTEM2 is more complex than FSSTEM1 but provides better trust evaluation, especially in dynamic multi-tenant environments where RR changes.

    DOI: 10.1177/09266801251408613

    Scopus

  • FDSDS: A Fuzzy-Based Driver Stress Detection System for VANETs Considering Interval Type-2 Fuzzy Logic and Its Performance Evaluation

    Higashi S., Kraikritayakul P., Liu Y., Ikeda M., Matsuo K., Barolli L.

    Information Switzerland   17 ( 1 )   2026.1

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    Publisher:Information Switzerland  

    Vehicular Ad Hoc Networks (VANETs) enable Vehicle-to-Vehicle (V2V) and Vehicle-to-Infrastructure (V2I) communications for enhancing road safety. However, reliable driver stress assessment remains challenging due to noisy sensing, inter-driver variability, and context dynamics. This paper proposes a Fuzzy-based Driver Stress Detection System (FDSDS) that employs an Interval Type-2 Fuzzy Logic System (IT2FLS) to model uncertainty. The FDSDS considers four complementary inputs—Heart Rate Variability (HRV), Galvanic Skin Response (GSR), Steering Angle Variation (SAV), and Traffic Density (TD)—to estimate Driver Stress Level (DSL). Extensive simulations (14,641 test points) show monotonic associations between DSL and the inputs, which reveal that physiological indicators dominate average influence (finite-difference sensitivity: GSR 0.357, SAV 0.239, TD 0.239, HRV 0.235). Under severe physiological conditions (HRV = 0.1, GSR = 0.9), the system consistently outputs high stress (mean DSL = 0.813; range 0.622–0.958), while favorable physiological conditions (HRV = 0.9, GSR = 0.1) yield low stress even in challenging traffic (range 0.044–0.512). The IT2FLS uncertainty bands widen for intermediate conditions, aligning with the inherent ambiguity of moderate stress states. These results indicate that combining physiological, behavioral, and environmental factors with IT2FLS yields interpreted, uncertainty-aware stress estimates suitable for real-time VANET applications.

    DOI: 10.3390/info17010050

    Scopus

  • An Intelligent System for Determining Driver Anxiety Level: A Comparison Study of Two Fuzzy-Based Models Reviewed

    Liu Y., Barolli L.

    Future Internet   16 ( 10 )   2024.10

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    Authorship:Lead author   Publisher:Future Internet  

    While driving, stress and frustration can affect safe driving and pose the risk of causing traffic accidents. Therefore, it is important to control the driver’s anxiety level in order to improve the driving experience. In this paper, we propose and implement an intelligent system based on fuzzy logic (FL) for deciding the driver’s anxiety level (DAL). In order to investigate the effects of the considered parameters and compare the evaluation results, we implement two models: DAL Model 1 (DALM1) and DAL Model 2 (DALM2). The input parameters of DALM1 include driving experience (DE), in-car environment conditions (IECs), and driver age (DA), while for DALM2, we add a new parameter called the accident anxiety state (AAS). For both models, the output parameter is DAL. We carried out many simulations and compared the results of DALM1 and DALM2. The evaluation results show that the DAL is very good for drivers’ ages between 30 to 50 years old. However, when the driver’s age is below 30 or above 50, DAL tends to decline. With an increase in DE and IECs, the DAL value is decreased. But when the AAS is increased, the DAL is increased. DALM2 is more complex because the rule base is larger than DALM1, but it makes a better decision of DAL value.

    DOI: 10.3390/fi16100348

    Scopus

Books

  • Implementation of Cat Swarm Optimization Simulation System for Node Placement Problem in Wireless Mesh Networks

    Irie Y., Sakamoto S., Kraikritayakul P., Barolli A., Liu Y., Barolli L.

    Lecture Notes on Data Engineering and Communications Technologies  2026 

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    Wireless Mesh Networks (WMNs) are rapidly developing due to their usefulness and deployment capabilities, making them effective solutions for diverse networking applications. However, these networks face several challenges, including congestion, interference, diminished data transfer rates, packet loss, and increased latency. The strategic placement of mesh routers is crucial for mitigating these issues. However, finding the best placement of mesh routers in WMNs is a complex and challenging issue and is classified as an NP-hard problem. To solve this problem, we propose and implement a Cat Swarm Optimization (CSO) based intelligent simulation system, called WMN-CSO. We evaluate the performance of proposed system for Normal and Uniform distribution of mesh clients considering SGC and NCMC metrics. The simulation results indicate that the proposed system can achieve better connectivity and user coverage for Normal distribution of mesh clients.

    DOI: 10.1007/978-3-032-05892-8_2

    Scopus

  • Performance Evaluation and Analysis of Parallelotope-Shaped Blend Crossover for Membership Function Optimization in Fuzzy-Based Systems

    Higashi S., Kraikritayakul P., Liu Y., Ikeda M., Matsuo K., Barolli L.

    Lecture Notes on Data Engineering and Communications Technologies  2026 

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    The optimization of membership function parameters in Fuzzy-based systems is difficult because of complex interdependencies and geometric constraints. Traditional crossover operators like Blend Crossover (BLX-α) and Simulated Binary Crossover (SBX) were designed for unconstrained optimization and they cannot use effectively the parameter correlation in Fuzzy systems. In this paper, we consider parallelotope-shaped Blend Crossover (psBLX) for membership function parameter optimization. We conducted 30 independent runs on a Mamdani fuzzy inference system with 2,700 samples and show that psBLX with β=1.1 gives statistically significant performance improvements of up to 22.69% in mean absolute error compared to SBX. Friedman tests and Nemenyi post-hoc analysis confirm the practical significance of these improvements (p<0.001). The results show that β>1.0 provides optimal exploration characteristics for membership function optimization, improving both theoretical understanding of geometric crossover mechanisms and practical Fuzzy system design methods.

    DOI: 10.1007/978-3-032-06161-4_18

    Scopus

  • GA-RL: A Handover Decision-Making System for VANETs Considering Genetic Algorithm and Reinforcement Learning

    Ampririt P., Kraikritayakul P., Liu Y., Ikeda M., Matsuo K., Barolli L.

    Lecture Notes on Data Engineering and Communications Technologies  2026 

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    In highly dynamic Vehicular Ad Hoc Networks (VANETs), maintaining reliable and efficient handover decisions is critical for ensuring stable connectivity between vehicles and Roadside Units (RSUs). In this paper, we propose and implement a handover decision-making system for VANETs considering Genetic Algorithm (GA) and Reinforcement Learning (RL) called GA-RL handover decision system. In the first phase, the GA is employed to globally optimize the weighting parameters used in handover decision-making, considering key metrics such as signal strength, RSU load, time-to-stay, and penalty cost. These GA-optimized weights are then integrated into RL using a Deep Q-Network (DQN) framework, where the agent learns a dynamic handover policy by interacting with the vehicular environment. The training process utilizes a replay buffer and target network to improve convergence stability and performance. From the simulation results, the GA-RL handover decision system consistently performs better than the traditional A3-RSRP method across multiple key performance indicators. Also, it achieves higher handover success rates, lower failure rates, reduced handover frequency volatility, fewer packet drops, and significantly better throughput retention during handover. These improvements indicate that GA-RL system provides more stable, adaptive, and efficient handover decisions, making it a good approach for maintaining better communication performance and seamless mobility in VANET environments.

    DOI: 10.1007/978-3-032-05772-3_13

    Scopus

  • FSASP: A Fuzzy-Based System for Assessment of Security Posture in 5G/B5G Network Slicing

    Higashi S., Kraikritayakul P., Liu Y., Ikeda M., Matsuo K., Barolli L.

    Lecture Notes on Data Engineering and Communications Technologies  2026 

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    In Fifth-Generation (5G) and Beyond 5G (B5G) networks, Network Slicing (NS) enables diverse services to coexist on shared infrastructure, but assessing Security Posture (SP) presents significant challenges due to complex, multi-dimensional security attributes and inherent uncertainty in evaluation processes. Traditional security assessment methods rely on binary approaches that fail to capture complex relationships between security dimensions. To address these limitations, this paper proposes a Fuzzy-based System for Assessment of Security Posture (FSASP) in 5G/B5G NS environment. The FSASP integrates three parameters: Identity and Access Management Strength (IAMS), Vulnerability Exposure (VE), and Monitoring and Response Maturity (MRM) and utilize Fuzzy Logic (FL) to provide comprehensive SP assessment. Simulation results demonstrate that VE has the most negative impact on SP, while achieving good security requires optimization across all dimensions. Single-dimension strengths cannot compensate the weaknesses of other parameters, emphasizing the importance of balanced security investments. The proposed FSASP offers an interpretable and uncertainty-aware framework that provides valuable guidance for security administrators in prioritizing investments and making risk mitigation decisions in dynamic 5G/B5G NS environments.

    DOI: 10.1007/978-3-032-10347-5_14

    Scopus

  • Edge-IDS: A Fuzzy-Based Simulation System and Design of a Testbed for Detecting Cyber Attacks

    Ampririt P., Kraikritayakul P., Liu Y., Ikeda M., Matsuo K., Barolli L.

    Lecture Notes on Data Engineering and Communications Technologies  2026 

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    The growing proliferation of Internet of Things (IoT) and edge devices has increased the demand for lightweight and adaptive intrusion detection systems capable of operating in resource-constrained environments. In this paper, we present a testbed called Edge-IDS, which is built on five Raspberry Pi devices interconnected via a central switch. Two Raspberry Pis are configured as attackers (scanner and flooder), two generate benign client–server traffic, and one device functions as the central orchestrator and IDS. A Fuzzy-based Intrusion Detection System (FIDS) is implemented on the orchestrator, using three traffic-derived parameters: Packet Rate (PR), Failed-Connection Ratio (FCR), and Destination-Port Entropy (DPE) to compute an Attack Possibility Level (APL). Before deployment on the testbed, the system was evaluated through simulations, and the results demonstrate that the fuzzy approach can effectively differentiate between benign and malicious traffic patterns. For example, when the packet rate is overloaded (PR = 0.9), with unstable connections (FCR = 0.9) and higher entropy or DPE is more than 0.5, the system outputs an APL value that is more than 0.7, showing that the system identifies high-rate, unstable, and widely distributed traffic as malicious.

    DOI: 10.1007/978-3-032-10347-5_18

    Scopus

  • A Fuzzy-Based System for Assessing Driver Condition Considering Different Driver Body Parameters

    Liu Y., Barolli L.

    Lecture Notes on Data Engineering and Communications Technologies  2026 

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    Driver mental status plays a crucial role in ensuring road safety and factors such as fatigue, stress, and lack of attention significantly increase the risk of accidents. Conventional monitoring systems often rely on single indicators, which may not provide a comprehensive evaluation of driver condition. In this study, we propose a Fuzzy Logic (FL) based system for assessing driver condition by integrating multiple parameters, including physical parameters for deciding Driver Body Condition (DBC). We call this system FL-based DBC (FLDBC) system. As input parameters for FLDBC system we consider Pupil Dilation (PD), Driver Facial Expression Changes (DFEC), Handle Reaction Time (HRT) and Driver Heart Rate Status (DHRS). The output parameter is DCB. We evaluated the implemented system by computer simulations. The simulation results show that DCB is good when the pupil dilation is normal. With increasing HRT, the DCB value increased. Also, when DFEC and HRT changed, the DCB value increased.

    DOI: 10.1007/978-3-032-10347-5_20

    Scopus

  • A Cuckoo Search Based Simulation System for WMNs and Its Performance Considering Load Balancing and Exponential Distribution of Mesh Clients

    Sakamoto S., Liu Y., Matsuo K., Barolli L.

    Lecture Notes on Data Engineering and Communications Technologies  2026 

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    Wireless Mesh Networks (WMNs) are well-known for their exceptional resilience and rapid deployment capabilities, making them well-suited for a diverse range of networking applications. However, these networks face several challenges, including congestion, interference, diminished data transfer rates, packet loss, and increased latency. The strategic placement of mesh routers is critical for mitigating these issues. Nevertheless, determining the optimal locations for mesh routers within WMNs is a complex problem that is classified as NP-hard. To solve this problem, we propose and implement an intelligent simulation system based on Cuckoo Search (CS) algorithm, called WMN-CS. This study evaluates the performance of WMNs utilizing the WMN-CS system considering load balancing among mesh routers and Exponential distribution of mesh clients. The simulation results demonstrate that the system effectively facilitates load balancing while improving connectivity and user coverage.

    DOI: 10.1007/978-3-032-05772-3_9

    Scopus

  • Performance Evaluation of an Intelligent System Based on a Cuckoo Search Algorithm for Mesh Router Optimization Considering Load Difference Metric and a Middle-Scale WMN

    Sakamoto S., Barolli A., Liu Y., Matsuo K., Barolli L.

    Lecture Notes on Data Engineering and Communications Technologies  2026 

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    Wireless Mesh Networks (WMNs) are recognized as good and diverse networking applications due to their robustness and rapid deployment potential. Nevertheless, these networks have challenges such as congestion, interference, reduced throughput, packet loss, and increased latency. The optimal placement of mesh routers plays a pivotal role in mitigating these issues. However, identifying the optimal router locations is computationally intractable and is considered an NP-hard problem. To solve this problem, we propose and implement an intelligent simulation framework based on Cuckoo Search (CS) algorithm named WMN-CS. This study evaluates the performance of WMNs using the WMN-CS system considering load balancing among mesh routers measured by Load Difference (LD) metric and a middle scale WMN. Simulation results demonstrate that the proposed system minimize the LD while maintaining good network connectivity and client coverage.

    DOI: 10.1007/978-3-032-10344-4_5

    Scopus

  • Performance Evaluation of a Cat Swarm Optimization Based Simulation System Considering Different Mixture Ratios and Uniform Distribution of Mesh Clients

    Irie Y., Sakamoto S., Kraikritayakul P., Barolli A., Liu Y., Barolli L.

    Lecture Notes on Data Engineering and Communications Technologies  2026 

     More details

    Wireless Mesh Networks (WMNs) are rapidly developing due to their usefulness and deployment capabilities, making them effective solutions for diverse networking applications. However, these networks face several challenges, including congestion, interference, diminished data transfer rates, packet loss, and increased latency. The strategic placement of mesh routers is crucial for mitigating these issues. However, finding the best placement of mesh routers in WMNs is a complex and challenging issue and is classified as an NP-hard problem. To solve this problem, we propose and implement a Cat Swarm Optimization (CSO) based intelligent simulation system, called WMN-CSO. We evaluate the performance of proposed system for Uniform distribution of mesh clients considering different Mixture Ratios (MRs). The simulation results indicate that the system performs better for smaller MR values.

    DOI: 10.1007/978-3-032-10347-5_21

    Scopus

  • WMN-CS: A Cuckoo Search Based Simulation System for Node Placement in WMNs and Its Performance Evaluation Considering Replacement Parameter

    Sakamoto S., Liu Y., Matsuo K., Barolli L.

    Lecture Notes on Data Engineering and Communications Technologies  2025 

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    Wireless Mesh Networks (WMNs) are knowing for their significant robustness and rapid deployment capabilities, rendering them effective solutions for wireless networking. However, these networks face several challenges, including congestion, interference, diminished data transfer rates, packet loss, and increased latency. The strategic placement of mesh routers is crucial in mitigating these issues. Nevertheless, determining the optimal locations for mesh routers in WMNs is a challenge and is classified as an NP-hard problem. To solve this issue, we propose and implement an intelligent simulation system that employs Cuckoo Search (CS) algorithm, called WMN-CS system. In this study, we evaluate the performance of a WMN utilizing WMN-CS system considering the replacement parameter. We conducted computer simulations to evaluate the proposed system considering Size of Giant Component (SGC) and Number of Covered Mesh Clients (NCMC) metrics. The evaluation results indicate that WMN-CS can achieve the maximum value of SGC across all tested replacement parameters. On the other hand, the performance of WMN-CS for NCMC varies depending on the specific replacement parameter utilized. The findings suggest that a smaller replacement parameter performs better in the considered scenarios.

    DOI: 10.1007/978-3-031-96099-4_19

    Scopus

  • A Fuzzy-Based System for Decision of Driver Mental Status Considering Driver Anxiety Level, Traffic Situation and Driving Operating Time

    Liu Y., Barolli L.

    Lecture Notes on Data Engineering and Communications Technologies  2025 

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    For safe driving and decrasing the risk of traffic accidents, it is important to control the driver mental status. In this paper, we implement an intelligent system based on Fuzzy Logic (FL) for deciding Driver Mental Status (DMS). We call this system FL-based DMS System (FLDMSS). The input parameters for FLDMSS are Driver Anxiety Level (DAL), Traffic Situation (TS) and Driving Operating Time (DOT). The output parameter is DMS. We evaluated the implemented system by computer simulations. The simulation results show that DMS is very good when the driving operating time is short. With increasing of DAL and DOT values, the DMS value is decreased. But when TS is good, the DMS value is increased.

    DOI: 10.1007/978-3-031-76452-3_34

    Scopus

  • Performance Evaluation of a Small-Scale WMN by WMN-CS Simulation System Considering Load Balancing Among Mesh Routers

    Sakamoto S., Liu Y., Matsuo K., Barolli L.

    Lecture Notes on Data Engineering and Communications Technologies  2025 

     More details

    Wireless Mesh Networks (WMNs) are known for their significant resilience and rapid deployment capabilities, rendering them effective solutions for various networking applications. However, these networks face several challenges, including congestion, interference, diminished data transfer rates, packet loss, and increased latency. The strategic placement of mesh routers is crucial for mitigating these issues. However, to find the best locations for mesh routers in WMNs is a complex challenge because it is classified as an NP-hard problem. To tackle this challenge, we propose and implement a Cuckoo Search (CS) algorithm based intelligent simulation system, called WMN-CS. In this study, we evaluate the performance of WMN using WMN-CS system considering the load balancing among mesh routers. The simulation results demonstrate that the system effectively manages load balancing while maximizing connectivity and user coverage.

    DOI: 10.1007/978-3-031-96093-2_19

    Scopus

  • Performance Evaluation of a Fuzzy Trust System for Network Slicing in 5G/B5G Wireless Networks

    Higashi S., Ampririt P., Liu Y., Ikeda M., Matsuo K., Barolli L.

    Lecture Notes on Data Engineering and Communications Technologies  2025 

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    Network slicing is a key enabling technology for 5G/B5G networks, allowing diverse services with distinct requirements to coexist on shared infrastructure. However, ensuring the trustworthiness of slices and improving performance, reliability, and security remains a significant challenge. This paper proposes a Hierarchical Fuzzy Trust System (H-FTS) to evaluate the trustworthiness of network slices. The system integrates Quality of Service (QoS) metrics (Latency, PLR, Throughput), Slice Failure Rate (SFR), Security Posture (SP), and Isolation Integrity (II). A lower-level Type-1 Fuzzy Logic System (T1 FLS) assesses the QoS score. This score, along with SFR, SP and II, is fed into an upper-level Interval Type-2 FLS (IT2 FLS) to compute Slice Trust (ST) score. Simulation results demonstrate the effectiveness of H-FTS, indicating that improvements in QoS, SP, and II have a positive impact on ST, while SFR shows a negative influence. The proposed H-FTS offers an interpretable and structured approach to trust assessment, essential for managing complex network slicing ecosystems.

    DOI: 10.1007/978-3-031-96099-4_22

    Scopus

  • A Fuzzy-Based System for Selection of Slice Service Type in 5G/B5G Wireless Networks: Effects of Slice Ability for Mobility Management Parameter

    Ampririt P., Higashi S., Liu Y., Ikeda M., Matsuo K., Barolli L.

    Lecture Notes on Data Engineering and Communications Technologies  2025 

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    The rapid advancement of wireless communication technology has had a significant impact on modern society, bringing about revolutionary changes in our daily lives and means of communication. In particular, introducing 5G and Beyond 5G (5G/B5G) networks is expected to expand communication coverage, including in the sky, at sea, and in outer space, while enabling ultra-low power consumption and low-cost communication. In order to adapt to such developments, Network Slicing (NS) is a technology that virtually divides the communication infrastructure to optimally allocate resources tailored to the requirements of individual services. Also, it is important to select slices that match the characteristics of each service. In B5G networks, individually optimized slices are required to support a wider variety of services and applications. To ensure that resources are distributed effectively without compromising the performance of any slice, in this paper, we propose a Fuzzy-based System for Selection of Slice Service Type (F3ST), which considers four parameters: Bandwidth (Bt), Latency (La), Connection Density (CD) and Slice Ability for Mobility Management (SAMM), which is a new parameter. From simulation results, we found that when Bt and SAMN are increased, the Slice Service Type Decision (SSTD) value is increased, but when La and CD are increased, the SSTD is decreased.

    DOI: 10.1007/978-3-031-96093-2_17

    Scopus

  • Selection of Reliable Best Peer in a Group of Peers by Using Correlation Coefficients and ns-3 Simulator

    Liu Y., Sakamoto S., Barolli L.

    Lecture Notes on Data Engineering and Communications Technologies  2024 

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    In P2P systems, especially in mobile P2P, it is necessary to consider the mobility tolerance of nodes and the instability of the network. The goal of this research is to develop a system for selecting reliable and best peers in a P2P communication environment. Previous research has focused on improving the reliability of peers and evaluating the reliability of the network as a whole. In this study, we focused on the reliability evaluation of each peer by using correlation coefficients and ns-3 simulator. Foe evaluation, we consider three parameters: delay time, packet loss and throughput. The simulation results show that the proposed systems can choose the best reliable peers.

    DOI: 10.1007/978-3-031-46970-1_22

    Scopus

  • Performance Evaluation of WMN-CS Intelligent Simulation System Considering Normal, Stadium, Subway and Uniform Distributions of Mesh Clients

    Sakamoto S., Barolli A., Liu Y., Nakamura S., Barolli L., Takizawa M.

    Lecture Notes on Data Engineering and Communications Technologies  2024 

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    Wireless Mesh Networks (WMNs) are effective networks because they have high-robustness and rapid deployment capabilities. However, they have have some issues such as congestion, interference, diminished data transfer speeds, packet losses, and increased latency. The location of mesh routers is one of the most critical decisions to deal with these problems. However, determining the optimal location of mesh routers in WMNs is difficult task and it is known to be an NP-hard problem. In order to solve this problem, we propose and implement an intelligent simulation system based on Cuckoo Search (CS) algorithm, which is a meta-heuristic approach. In this work, we evaluate the performance of WMN-CS system considering Normal, Stadium, Subway and Uniform distributions of mesh clients. The simulation results show that the distribution of mesh clients affects the performance of WMN-CS. The Normal distribution achieves a faster convergence compared to the other distributions. Comparing Stadium and Subway distributions, the Stadium distribution converges faster than the Subway distribution. The Uniform distribution shows the slowest convergence speed and has the lowest NCMC values.

    DOI: 10.1007/978-3-031-72322-3_3

    Scopus

  • Peer Selection for Reliability Improvement in P2P Networks by Fuzzy-Based and Ns-3 Simulation Systems.

    Yi Liu 0011, Shinji Sakamoto, Leonard Barolli

    2024 

  • Assessment of WMN-CS Intelligent Simulation System for Uniform, Weibull and Chi-Square Distribution of Mesh Clients

    Sakamoto S., Barolli L., Liu Y., Takizawa M.

    Lecture Notes on Data Engineering and Communications Technologies  2024 

     More details

    Wireless Mesh Networks (WMNs) are effective networks because they have high-robustness and rapid deployment capabilities. However, they have some issues such as congestion, interference, diminished data transfer speeds, packet losses, and increased latency. The location of mesh routers is one of the most critical decisions to deal with these problems. However, determining the optimal location of mesh routers in WMNs is difficult task and it is known to be an NP-hard problem. In order to solve this problem, we propose and implement an intelligent simulation system based on Cuckoo Search (CS) algorithm, which is a meta-heuristic approach. In this work, we assess the performance of WMN-CS considering Uniform, Weibull and Chi-square distributions of mesh clients. For evaluation, we carried out computer simulations. The simulation results show that the distribution of mesh clients affects the performance of WMN-CS. In case of Uniform distribution of mesh clients, the convergence speed is faster than the Weibull and Chi-square distributions, but the converged value of NCMC is the lowest among these three distributions. In the case of Weibull distribution, the convergence speed is slower than the Uniform and Chi-square distributions, but the converged value of NCMC is the highest among three of them. The performance of WMN-CS for Chi-square distribution is between Uniform and Weibull distributions.

    DOI: 10.1007/978-3-031-70011-8_12

    Scopus

  • A Cuckoo Search Based Simulation System for Node Placement Problem in WMNs: Performance Evaluation for Normal, Exponential and Weibull Distributions of Mesh Clients.

    Shinji Sakamoto, Leonard Barolli, Yi Liu 0011, Makoto Takizawa 0001

    2024 

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Teaching Experience

  • プログラミング応用

    Institution:大分工業高等専門学校

  • コンピュータネットワーク

    Institution:大分工業高等専門学校

  • インタフェースデザイン

    Institution:大分工業高等専門学校

  • プログラミング演習Ⅰ、Ⅱ

    Institution:大分工業高等専門学校

  • 通信工学Ⅰ、Ⅱ

    Institution:大分工業高等専門学校

  • 情報ネットワーク

    Institution:大分工業高等専門学校

  • 工学実験

    Institution:大分工業高等専門学校

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