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Development status of high power fiber lasers and their coherent beam combination

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Science China(Information Sciences) 2019年第4期62卷 56-87页

作者： Zejin LIU Xiaoxi jin Rongtao su Pengfei MA Pu ZHOU College of Advanced Interdisciplinary Studies National University of Defense Technology

High-power fiber laser has been emerged great potential in a wide range of applications and becomes a robust candidate for high energy solid state laser system. To further increase the output brightness of single-channel fiber laser, high-brightness pump sources and high-power-handling passive components should be fabricated and utilized in the fiber laser systems, in addition to the advanced techniques for multiple nonlinear effects managements. The state-of-the-art high power fiber lasers are reviewed, in terms of narrow-linewidth fiber lasers, broadband fiber lasers and fiber lasers at 2 μm. Coherent beam combining is a promising technique to obtain higher output power while maintaining excellent beam quality simultaneously,which breaks through the bottlenecks of single-channel fiber laser. Based on a series of key techniques for coherent beam combining, high-power coherent beam combining of fiber lasers could be enabled with high combining efficiency. In this paper, we review the progress of high-power fiber lasers and their coherent beam combining in the recent decade, particularly the relevant work in our group. The future prospects of fiber lasers and coherent beam combining technique are also discussed.

关键词： fiber lasers and amplifiers nonlinear effects and mode instability coherent beam combining passive components 2 μm fiber lasers

Opportunistic spectrum sharing in software defined wireless network

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Journal of Systems Engineering and Electronics 2014年第6期25卷 934-941页

作者： Mao Yang Yong Li Depeng jin Li su Lieguang Zeng Department of Electronic Engineering Tsinghua University

Over the past few decades, the world has witnessed a rapid growth in mobile and wireless networks（MWNs） which significantly change human life. However, proliferating mobile demands lead to several intractable challenges that MWN has to face. Software-defined network is expected as a promising way for future network and has captured growing attention. Network virtualization is an essential feature in software-defined wireless network（SDWN）, and it brings two new entities, physical networks and virtual networks. Accordingly, efficiently assigning spectrum resource to virtual networks is one of the fundamental problems in SDWN. Directly orienting towards the spectrum resource allocation problem, firstly, the fluctuation features of virtual network requirements in SDWN are researched, and the opportunistic spectrum sharing method is introduced to SDWN. Then, the problem is proved as NP-hardness. After that, a dynamic programming and graph theory based spectrum sharing algorithm is *** demonstrate that the opportunistic spectrum sharing method conspicuously improves the system performance up to around 20%–30% in SDWN, and the proposed algorithm achieves more efficient performance.

关键词： software-defined network(SDN) wireless virtualiza-tion opportunistic spectrum sharing dynamic programming graph theory

pH-Dependent binding energy-induced inflection-point behaviors for pH-universal hydrogen oxidation reaction

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Science China Chemistry 2023年第11期66卷 3262-3268页

作者： Lixin su Yiming jin Xinran Fan Zeyu Liu Wei Luo Hubei Key Lab on Organic and Polymeric Opto-Electronic Materials College of Chemistry and Molecular SciencesWuhan UniversityWuhan 430072China

The kinetics of hydrogen oxidation reaction(HOR)declines with orders of magnitude when the electrolyte varies from acid to ***,unveiling the mechanism of pH-dependent HOR and narrowing the acid-base kinetic gap are indispensable and ***,the HOR behaviors of palladium phosphides and their counterpart(PdP_2/C,Pd_5P_2/C,Pd_3P/C,and Pd/C)in the whole pH region(from pH 1 to 13)are ***,there are non-monotonous relationships between their HOR kinetics and varied pHs,showing distinct inflection-point behaviors(inflection points and acid-base kinetic gaps).We find the inflection-point behaviors can be explained by the discrepant role of pH-dependent hydroxyl binding energy(OHBE)and hydrogen binding energy(HBE)induced HOR kinetics under the entire pH *** further reveal that the strengthened OHBE is responsible for the earlier appearance of the inflection point and much narrower acid-base kinetic *** findings are conducive to understanding the mechanism of the pH-targeted HOR process,and provide a new strategy for rational designing advanced HOR electrocatalysts under alkaline electrolyte.

关键词： hydrogen oxidation reaction inflection-point behaviors pH-dependent binding energy palladium phosphides

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多路径传输技术研究综述

软件学报 2025年第1期36卷 289-320页

作者：苏金树宋丛溪计晓岚徐草韩彪国防科技大学计算机学院军事科学院

多路径传输技术是指通过设备上的多个网络接口,在通信双方建立多条传输路径,实现带宽聚合、负载均衡、路径冗余,增加传输的吞吐量,提高可靠性.多路径传输技术凭借其上述优势,已被广泛应用于服务器、终端和数据中心等场景,是网络体系结... 详细信息

多路径传输技术是指通过设备上的多个网络接口,在通信双方建立多条传输路径,实现带宽聚合、负载均衡、路径冗余,增加传输的吞吐量,提高可靠性.多路径传输技术凭借其上述优势,已被广泛应用于服务器、终端和数据中心等场景,是网络体系结构和传输技术研究的重要组成,具有重要研究价值和意义.为此,从概念、核心机制等方面,系统梳理了多路径传输技术.首先概述了多路径传输的基本概念、标准化进程以及应用价值.其次,阐述多路径传输技术的核心机制,包括拥塞控制、报文调度、路径管理、重传机制、安全机制,以及面向特定应用的机制设计.对每种机制的分类方法、主要研究成果给予了总结和评述,分析总结了不同机制的优缺点与发展方向.最后,探讨了多路径传输技术研究面临的挑战,展望了未来研究方向.

关键词：多路径传输 QUIC 拥塞控制报文调度智能网络

Projection-based Consistent Test for Linear Regression Model with Missing Response and Covariates

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Acta Mathematicae Applicatae Sinica 2020年第4期36卷 917-935页

作者： su-jin ZHENG Si-yu GAO Zhi-hua suN China Institute for Actuarial Science/School of Insurance Central University of Finance and EconomicsBeijing 100081China School of Mat hematic Sciences University of Chinese Academy of SciencesBeijing 100049China Key Laboratory of Big Data Mining and Knowledge Management of Chinese Academy of Sciences Beijing 100049China

In recent years,there has been a large amount of literature on missing *** of them focus on situations where there is only missingness in response or *** this paper,we consider the adequacy check for the linear regression model with the response and covariates missing *** apply model adjustment and inverse probability weighting methods to deal with the missingness of response and covariate,*** order to avoid the curse of dimension,we propose an empirical process test with the linear indicator weighting *** asymptotic properties of the proposed test under the null,local and global alternative hypothe tical models are rigorously investigated.A consisten t wild boot strap method is developed to approximate the critical ***,simulation studies and real data analysis are performed to show that the proposed method performed well.

关键词： consistency linear indicator weighting function empirical process missing response and covariates projection

Room-temperature synthesis of ZrSnO4 nanoparticles for electron transport layer in efficient planar hetrojunction perovskite solar cells

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Journal of Materials Science & Technology 2020年第7期42卷 38-45页

作者： Young Wook Noh In su jin Sang Hyun Park Jae Woong Jung Department of Advanced Materials Engineering for Information&Electronics Kyung Hee University1732 Deogyeong-daeroGiheung-guYongin-siGyeonggi-do 446-701Republic of Korea

The interface engineering plays a key role in controlled optoelectronic properties of perovskite photovoltaic devices,and thus the electron transport layer(ETL)material with tailored optoelectronic properties remains a challenge for achieving high photovoltaic performance of planar perovskite solar cells(PSCs).Here,the fine and crystalline zirconium stanate(ZrSnO4)nanoparticles(NPs)was synthesized at low temperature,and its optoelectronic properties are systematically *** from the favorable electronic structure of ZrSnO4 NPs for applications in ETL,efficient electron transport and extraction with suppre s sed charge recombination are achieved at the interface of perovskite *** a result,the optimized ZrSnO4 NPs synthesized at room-temperature deliver the optimized power conversion efficiency up to 16.76%with acceptable *** work opens up a new class of ternary metal oxide for the use in ETL of the planar PSCs and should pave the way toward designing new interfacial materials for practical optoelectronic devices.

关键词： ZrSnO4 Electron transport layer Nanoparticles Perovskite solar cells

What is the best strategy for successful bowel preparation under special conditions?

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World Journal of Gastroenterology 2014年第11期20卷 2741-2745页

作者： Yun Jeong Lim su jin Hong Department of Internal Medicine College of MedicineDongguk UniversityGyeonggi-Do 410-773South Korea Digestive Disease Center and Research Institute Department of Internal MedicineSoonchunhyang University College of MedicineBucheonGyeonggi-Do 420-767South Korea

Adequate bowel preparation is important for successful colonoscopic examination. Several effective colonic cleansing agents are available and routinely prescribed, but each carries its own limitations and benefits from particular dosing regimens. The most frequently prescribed colonic cleansing agent, the polyethylene glycol (PEG) cathartic solution, suffers from low patient compliance in general, due to its unpalatable taste and smell coupled with the large ingested volumes required. However, PEG is preferred over other cathartics for use in individuals of advanced age, sufferers of chronic kidney disease, heart failure and inflammatory bowel disease, and women who are pregnant or lactating. The laxative agents sodium phosphate (NaP) and sodium picosulfate plus magnesium citrate have been applied and have improved patient compliance and tolerance. NaP, however, should be avoided in individuals with impaired renal function or plasma clearance, such as those with chronic kidney disease, who are taking drugs that affect renal function, or who suffer from heart failure. Other special conditions that may affect an individual’s tolerance of the cathartic agent or ability to complete the administration routine include stroke, severe constipation, hematochezia, suspicious lower gastrointestinal bleeding, and mental disorders such as dementia. All ingestible bowel preparation solutions can be instilled into the stomach and duodenum through nasogastric tube or esophagogastroduodenoscope with the aid of a water irrigation pump for patients with difficulties swallowing or ingesting the large volumes of fluid required. In addition, dietary regimens based on clear liquids and low-residue foods for 1-4 d prior to the colonoscopy may be supplemental bowel preparation strategies. Achieving an effective and safe cleansing of the bowel is important for successful colonoscopy in all patients, so full knowledge of the individual’s condition and capabilities is necessary

关键词： Colonoscopy Preparation Polyethylene glycols Special conditions Cathartic agent

Drain-site hernia after laparoscopic rectal resection:A case report and review of literature

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World Journal of Clinical Cases 2022年第8期10卷 2637-2643页

作者： jin su Cheng Deng Hui-Ming Yin Department of General surgery Zhuzhou Central HospitalThe Affiliated Zhuzhou Hospital of Xiangya Medical College of Central South UniversityZhuzhou 412000Hunan ProvinceChina Division of Science and Education Zhuzhou Central HospitalThe Affiliated Zhuzhou Hospital of Xiangya Medical College of Central South UniversityZhuzhou 412000Hunan ProvinceChina Department of General surgery the Second Affiliated Hospital of Hunan University of Traditional Chinese MedicineChangsha 410000Hunan ProvinceChina

BACKGROUND Drain-site hernia(DSH)has an extremely low morbidity and has rarely been *** bowel obstruction is a frequent concurrent condition in most cases of DSH,which commonly occurs at the≥10 mm *** we report a rare case of DSH at the lateral 5 mm port site one month postoperatively without visceral ***,a brief review of the literature was conducted focusing on the risk factors,diagnosis,and prevention strategies for *** suMMARY A 76-year-old male patient was admitted to our institution with intermittent abdominal pain and a local abdominal mass which occurred one month after laparoscopic radical resection of rectal cancer one year ago.A computed tomography scan showed an abdominal wall hernia at the 5 mm former drain-site in the left lower quadrant,and that the content consisted of the large *** elective herniorrhaphy was performed by closing the fascial defect and reinforcing the abdominal wall with a synthetic mesh *** postoperative period was *** patient was discharged seven days after the operation without surgery-related complications at the 1-mo follow-up *** Emphasis should be placed on DSH despite the decreased use of intra-abdominal *** is recommended that placement of a surgical drainage tube at the≥10 mm trocar site should be ***,it is advisable to have a comprehensive understanding of the risk factors for DSH and complete closure of the fascial defect at the drainage site for high-risk patients.

关键词： Drain-site hernia Abdominal hernia Laparoscopic surgery surgical drainage Risk factor Case report

Three-dimensional kagome structures in a PCL/HA-based hydrogel scaffold to lead slow BMP-2 release for effective bone regeneration

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Bio-Design and Manufacturing 2023年第1期6卷 12-25页

作者： Se-Hwan Lee kang-Gon Lee Jaeyeon Lee Yong Sang Cho Min-Soo Ghim Soojin Kim su-jin Heo Yongdoo Park Young-Sam Cho Bu-Kyu Lee McKay Orthopaedic Research Laboratory Department of Orthopaedic SurgeryPerelman School of MedicineUniversity of Pennsylvania36th Street and Hamilton WalkPhiladelphiaPA 19104USA Department of Biomedical Sciences College of MedicineKorea University73Goryeodae-roSeongbuk-guSeoul 02841Republic of Korea Medical Device Development Center Daegu-Gyeongbuk Medical Innovation Foundation(K-MEDI hub)80Cheombok-roDong-guDaegu 41061Republic of Korea Department of Mechanical Engineering College of EngineeringWonkwang University460Iksan-daeroIksan 54538Republic of Korea Biomedical Engineering Research Center Asan Institute for Life SciencesAsan Medical Center88Olympic-roSongpa-guSeoul 05505Republic of Korea Department of Mechanical Design Engineering College of EngineeringWonkwang University460Iksan-daeroIksan 54538Republic of Korea MECHABIO Group Wonkwang University460Iksan-daeroIksan 54538Republic of Korea Department of Oral and Maxillofacial surgery Asan Institute for Life SciencesAsan Medical Center88Olympic-roSongpa-guSeoul 05505Republic of Korea

Osteoconductive function is remarkably low in bone disease in the absence of bone tissue surrounding the grafting site,or if the bone tissue is in poor ***,an effective bone graft in terms of both osteoconductivity and osteoinductivity is required for clinical ***,the three-dimensional(3D)kagome structure has been shown to be advantageous for bone tissue regeneration due to its mechanical *** this study,a polycaprolactone(PCL)kagome-structure scaffold containing a hyaluronic acid(HA)-based hydrogel was fabricated using a 3D printing *** retention capacity of the hydrogel in the scaffold was assessed in vivo with a rat calvaria subcutaneous model for 3 weeks,and the results were compared with those obtained with conventional 3D-printed PCL grid-structure scaffolds containing HA-based hydrogel and bulk-type HA-based *** retained hydrogel in the kagome-structure scaffold was further evaluated by in vivo imaging system *** further reinforce the osteoinductivity of the kagome-structure scaffold,a PCL kagome-structure scaffold with bone morphogenetic protein-2(BMP-2)containing HA hydrogel was fabricated and implanted in a calvarial defect model of rabbits for 16 *** bone regeneration characteristics were evaluated with hematoxylin and eosin(H&E),Masson’s trichrome staining,and micro-CT image analysis.

关键词： Kagome-structure scaffold Retention capacity Biomimetic hydrogel Bone morphogenetic protein-2(BMP-2)