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A large-scale flight multi-objective assignment approach based on multi-island parallel evolution algorithm with cooperative coevolutionary

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Science China(Information Sciences) 2016年第7期59卷 185-201页

作者： Renli L Xiangmin GUAN Xueyuan LI inseok HWANG Department of General Aviation Civil Aviation Management Institute of China School of Electronic and Information Engineering Beihang University School of Aeronautics and Astronautics Purdue University

Due to the rapid increase of air traffic demand, the large-scale flight assignment plays a crucial role in reducing airspace congestion and economic losses via reasonably regulating the air traffic flow of China. In this paper, the large-scale flight assignment problem is formulated as a multi-objective model with consideration of the reduction of airspace congestion and flight delay. However, it is a large-scale combinatorial optimization problem with complex constraints and tightly coupled decision variables, which is difficult to deal ***, an effective multi-objective optimization algorithm is proposed based on the multi-island parallel evolution framework(PEA) with a left-right probability migration topology. Multi-island PEA employs multiple evolution populations for solving the problem simultaneously, and the left-right probability migration topology for exchange individuals among populations to improve the efficiency of the cooperation of populations. Then the cooperative co-evolution(CC) algorithm is introduced for each population to further improve the searching capability. Simulation results using the real traffic data from the China air route network and daily flight plans demonstrate that the proposed approach can improve the solution quality effectively, showing superiority to the existing approaches such as the multi-objective genetic algorithm, the well-known multi-objective evolutionary algorithm based on decomposition, a CC-based multi-objective algorithm as well as other two parallel evolution algorithms with different migration topologies.

关键词： air traffic flow management flight assignment multi-island parallel evolution algorithm migration topology cooperative co-evolution

A hybrid distributed-centralized conflict resolution approach for multi-aircraft based on cooperative co-evolutionary

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Science China(Information Sciences) 2013年第12期56卷 281-296页

作者： ZHANG XueJun GUAN XiangMin HWANG inseok CAI KaiQuan School of Electronic and Information Engineering Beihang University

Conflict resolution(CR)plays a crucial role in safe air trafc management(ATM).In this paper,we propose a new hybrid distributed-centralized tactical CR approach based on cooperative co-evolutionary named the CCDG(cooperative co-evolutionary with dynamic grouping)strategy to overcome the drawbacks of the current two types of approaches,the totally centralized approach and distributed ***,aircraft are divided into several sub-groups based on their ***,a dynamic grouping strategy is proposed to group the aircraft to better deal with the tight coupling among *** sub-groups are adjusted dynamically as new conflicts appear after each ***,a fast genetic algorithm(GA)is used by each sub-group to optimize the paths of the aircraft ***,the aircraft’s optimal paths are obtained through cooperation among diferent sub-groups based on cooperative co-evolutionary(CC).An experimental study on two illustrative scenarios is conducted to compare the CCDG method with some other existing approaches and it is shown that CCDG which can get the optimal solution efectively and efciently in near real time,outperforms most of the existing approaches including Stratway,the fast GA,a general evolutionary path planner,as well as three well-known cooperative co-evolution algorithms.

关键词： multi-aircraft conflict resolution hybrid distributed-centralized dynamic grouping strategy cooperative co-evolutionary

Real-Time Prediction Algorithm for Intelligent Edge Networks with Federated Learning-Based Modeling

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Computers, Materials & Continua 2023年第11期77卷 1967-1983页

作者： Seungwoo Kang Seyha Ros inseok Song Prohim Tam Sa Math Seokhoon Kim Department of Software Convergence Soonchunhyang UniversityAsan31538Korea Department of Telecommunication and Electronic Engineering Royal University of Phnom PenhPhnom Penh12156Cambodia Department of Computer Software Engineering Soonchunhyang UniversityAsan31538Korea

Intelligent healthcare networks represent a significant component in digital applications,where the requirements hold within quality-of-service(QoS)reliability and safeguarding *** paper addresses these requirements through the integration of enabler paradigms,including federated learning(FL),cloud/edge computing,softwaredefined/virtualized networking infrastructure,and converged prediction *** study focuses on achieving reliability and efficiency in real-time prediction models,which depend on the interaction flows and network *** response to these challenges,we introduce a modified version of federated logistic regression(FLR)that takes into account convergence latencies and the accuracy of the final FL model within healthcare *** establish the FLR framework for mission-critical healthcare applications,we provide a comprehensive workflow in this paper,introducing framework setup,iterative round communications,and model evaluation/*** optimization process delves into the formulation of loss functions and gradients within the domain of federated optimization,which concludes with the generation of service experience batches for model *** assess the practicality of our approach,we conducted experiments using a hypertension prediction model with data sourced from the 2019 annual dataset(Version 2.0.1)of the Korea Medical Panel *** metrics,including end-to-end execution delays,model drop/delivery ratios,and final model accuracies,are captured and compared between the proposed FLR framework and other baseline *** study offers an FLR framework setup for the enhancement of real-time prediction modeling within intelligent healthcare networks,addressing the critical demands of QoS reliability and privacy preservation.

关键词： Edge computing federated logistic regression intelligent healthcare networks prediction modeling privacy-aware and real-time learning

Three-dimensionalization via control of laser-structuring parameters for high energy and high power lithium-ion battery under various operating con ditions

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Journal of Energy Chemistry 2022年第1期31卷 93-102,I0004页

作者： Junsu Park Hyeongi Song inseok Jang Jaepil Lee Jeongwook Um Seong-guk Bae Jihun Kim Sungho Jeong Hyeong-Jin Kim Ground Technology Research Insutitute Agency for Defense Development.P.O.Box 35Yuseong-guDaejeon 34186Republic of Korea Graduate School of Energy Convergence Gwangju Institute of Science and Technology123 Cheomdangwagi-ro.Buk-guGwangju 61005Republic of Korea School of Mechanical Engineering Gwangju Institute of Science and Technology123 Cheomdangwagi-ro.Buk-gu.Gwangju 61005Republic of Korea

Laser-structuring is an effective method to promote ion diffusion and improve the performance of lithium-ion battery(LIB)*** this work,the effects of laser structuring parameters(groove pitch and depth)on the fundamental characteristics of LIB electrode,such as interfacial area,internal resistances,material loss and electrochemical performance,are investigated,LiNi_(0.5)Co_(0.2)Mn_(0.3)O_(2) cathodes were structured by a femtosecond laser by varying groove depth and pitch,which resulted in a material loss of 5%-14%and an increase of 140%-260%in the in terfacial area between electrode surface and *** is shown that the importance of groove depth and pitch on the electrochemical performance(specific capacity and areal discharge capacity)of laser-structured electrode varies with current *** pitch is more im porta nt at low current rate but groove depth is at high curre nt *** the mapping of lithium concentration within the electrodes of varying groove depth and pitch by laser-induced breakdown spectroscopy,it is verified that the groove functions as a diffusion path for lithium *** ionic,electronic,and charge transfer resistances measured with symmetric and half cells showed that these internal resistances are differently affected by laser structuring parameters and the changes in porosity,ionic diffusion and electronic *** is demonstrated that the laser structuring parameters for maximum electrode performance and minimum capacity loss should be determined in consideration of the main operating conditions of LIBs.

关键词： Lithium-ion battery Laser structuring Energy density Power density Laser induced breakdown spectroscopy Lithium-ion diffusion

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Current diagnosis and treatment of benign biliary stricturesafter living donor liver transplantation

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World Journal of Gastroenterology 2016年第4期22卷 1593-1606页

作者： Jae Hyuck Chang inseok Lee Myung-Gyu Choi Sok Won Han Division of Gastroenterology Department of Internal MedicineCollege of MedicineThe Catholic University of KoreaSeoul 137-701South Korea

Despite advances in surgical techniques, benign biliary strictures after living donor liver transplantation(LDLT) remain a significant biliary complication and play an important role in graft and patient survival. Benign biliary strictures after transplantation are classified into anastomotic or non-anastomotic strictures. These two types differ in presentation, outcome, and response to therapy. The leading causes of biliary strictures include impaired blood supply, technical errors during surgery, and biliary anomalies. Because patients usually have non-specific symptoms, a high index of suspicion should be maintained. Magnetic resonance cholangiography has gained widespread acceptance as a reliable noninvasive tool for detecting biliary complications. Endoscopy has played an increasingly prominent role in the diagnosis and treatment of biliary strictures after LDLT. Endoscopic management in LDLT recipients may be more challenging than in deceased donor liver transplantation patients because of the complex nature of the duct-to-duct reconstruction. Repeated aggressive endoscopic treatment with dilation and the placement of multiple plastic stents is considered the first-line treatment for biliary strictures. Percutaneous and surgical treatments are now reserved for patients for whom endoscopic management fails and for those with multiple, inaccessible intrahepatic strictures or Roux-en-Y anastomoses. Recent advances in enteroscopy enable treatment, even in these latter cases. Direct cholangioscopy, another advanced form of endoscopy, allows direct visualization of the inner wall of the biliary tree and is expected to facilitate stenting or stone extraction. Rendezvous techniques can be a good option when the endoscopic approach to the biliary stricture is unfeasible. These developments have resulted in almost all patients being managed by the endoscopic approach.

关键词： Biliary strictures Living donor liver transplantation Endoscopic retrograde cholangiography Percutaneous transhepatic cholangiography Biliarycomplication