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Journal of Energy Chemistry 2023年第7期82卷 277-286,I0007页

作者： Ji Hoon Choi Hae-Jun Seok dongchul sung Dong Su Kim Hak Hyeon Lee Suklyun Hong Han-Ki Kim Hyung Koun Cho School of Advanced Materials Science and Engineering Sungkyunkwan University2066Seobu-roJangan-guSuwon-siGyeonggi-do 16419Republic of Korea Department of Physics Graphene Research Instituteand GRI-TPC International Research CenterSejong UniversitySeoul 05006Republic of Korea

The effectiveness of photoelectrochemical(PEC)water splitting is significantly restricted by insufficient light harvesting,rapid charge recombination,and slow water reduction *** the presence of amorphous phases in the interfaces hinders the overcome of these inherent limitations,a photoelectrode must be built ***,we artificially controlled the crystallographic orientation of indium tin oxide(ITO)to determine the orientation with the smallest lattice mismatch at the Cu_(2)O interface,thus significantly reducing the amorphous phase in the early stage of electrodeposition ***[222]/[400]mixed orientation ITO primarily exposed the{400}surface planes and accelerated charge transfer by forming an optimal interface with preferentially grown(111)oriented Cu_(2)O and minimized amorphous *** addition,the ITO surface energy was calculated using density functional theory to theoretically verify which plane is more active for growing the photoactivation *** rationally designed ITO/Cu_(2)O/Al-dope Zn O/TiO_(2)/Rh-P device,with each layer serving a specific purpose,achieved a photocurrent density of 8.23 mA cm^(-2)at 0 VRHEunder AM 1.5 G illumination,providing a standard method for effective solar-to-hydrogen conversion photocathodes.

关键词： Photoelectrochemical water splitting Cu_(2)O ITO Hydrogen Surface energy DFT

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Extending SSD Lifespan with Comprehensive Non-Volatile Memory-Based Write Buffers

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Journal of Computer Science & Technology 2019年第1期34卷 113-132页

作者： Ziqi Fan dongchul Park Department of Computer Science and Engineering University of Minnesota-Twin CitiesMinneapolisMN 55455U.S.A. Division of Computer and Electronic Systems Engineering Hankuk University of Foreign Studies Gyeonggi-do 17035South Korea

New non-volatile memory (NVM)technologies are expected to replace main memory DRAM (dynamic random access memory)in the near *** flash technological breakthroughs have enabled wide adoption of solid state drives (SSDs)in storage ***,flash-based SSDs,by nature,cannot avoid low endurance problems because each cell only allows a limited number of *** can give rise to critical SSD reliability *** many SSD write operations eventually cause many SSD erase operations,reducing SSD write traffic plays a crucial role in SSD reliability. This paper proposes two NVM-based buffer cache policies which can work together in different layers to maximally reduce SSD write traffic:a main memory buffer cache design named Hierarchical Adaptive Replacement Cache (H-ARC)and an internal SSD write buffer design named Write Traffic Reduction Buffer (WRB).H-ARC considers four factors (dirty,clean, recency,and frequency)to reduce write traffic and improve cache hit ratios in the *** reduces block erasures and write traffic further inside an SSD by effectively exploiting temporal and spatial *** two comprehensive schemes significantly reduce total SSD write traffic at each different layer (i.e.,host and SSD)by up to ***,they help extend SSD lifespan without system performance degradation.

关键词： buffer cache policy write buffer non-volatile memory solid state drive flash memory

Hot Data Identification with Multiple Bloom Filters： Block-Level Decision vs I/O Request-Level Decision

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Journal of Computer Science & Technology 2018年第1期33卷 79-97页

作者： dongchul Park Weiping He H. C. Du Division of Computer and Electronic Systems Engineering Hankuk University of Foreign Studies Gyeonggi-do 17035 Korea Intel Corporation Hillsboro OR 97124 U.S.A. Dell Storage Eden Prairie MN 55344 U.S.A. Department of Computer Science and Engineering University of Minnesota-Twin Cities Minneapolis MN 55455 U.S.A.

Hot data identification is crucial for many applications though few investigations have examined the subject. All existing studies focus almost exclusively on frequency. However, effectively identifying hot data requires equally considering recency and frequency. Moreover, previous studies make hot data decisions at the data block level. Such a fine-grained decision fits particularly well for flash-based storage because its random access achieves performance comparable with its sequential access. However, hard disk drives （HDDs） have a significant performance disparity between sequential and random access. Therefore, unlike flash-based storage, exploiting asymmetric HDD access performance requires making a coarse-grained decision. This paper proposes a novel hot data identification scheme adopting multiple bloom filters to efficiently characterize recency as well as frequency. Consequently, it not only consumes 50% less memory and up to 58% less computational overhead, but also lowers false identification rates up to 65% compared with a state-of-the-art scheme. Moreover, we apply the scheme to a next generation HDD technology, i.e., Shingled Magnetic Recording （SMR）, to verify its effectiveness. For this, we design a new hot data identification based SMR drive with a coarse-grained decision. The experiments demonstrate the importance and benefits of accurate hot data identification, thereby improving the proposed SMR drive performance by up to 42%.

关键词： hot data bloom filter shingled magnetic recording (SMR)

A Lookahead Read Cache： Improving Read Performance for Deduplication Backup Storage

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Journal of Computer Science & Technology 2017年第1期32卷 26-40页

作者： dongchul Park Ziqi Fan Young Jin Nam David H. C. Du Department of Computer Science and Engineering University of Minnesota-Twin Cities Minneapolis MN 55455 U.S.A.

Data deduplication （dedupe for short） is a special data compression technique. It has been widely adopted to save backup time as well as storage space, particularly in backup storage systems. Therefore, most dedupe research has primarily focused on improving dedupe write performance. However, backup storage dedupe read performance is also a crucial problem for storage recovery. This paper designs a new dedupe storage read cache for backup applications that improves read performance by exploiting a special characteristic： the read sequence is the same as the write sequence. Consequently, for better cache utilization, by looking ahead for future references within a moving window, it evicts victims from the cache having the smallest future access. Moreover~ to further improve read cache performance. it maintains a small log buffer to judiciously cache future access data chunks. Extensive experiments with real-world backup workloads demonstrate that the proposed read cache scheme improves read performance by up to 64.3%

关键词： deduplication dedupe read cache backup

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弓术文化的人文价值探索

江苏建筑职业技术学院学报 2017年第4期17卷 54-57页

作者：池东哲龙仁大学

弓术是东方思想的集大成者,是蕴藏了丰富的身体与精神文化,并传承至今的人文精神宝库.通过弓术所传承的人文精神,是不仅有益于个人人格培养,也有助于构建良好的人际关系的一种"仪"与"礼"的承袭.弓术内在的人文精神至今提醒着人们需克制... 详细信息

弓术是东方思想的集大成者,是蕴藏了丰富的身体与精神文化,并传承至今的人文精神宝库.通过弓术所传承的人文精神,是不仅有益于个人人格培养,也有助于构建良好的人际关系的一种"仪"与"礼"的承袭.弓术内在的人文精神至今提醒着人们需克制欲望与修炼美德.分析了圣贤们所传承下来的弓术及其相关人文精神,并尝试探索弓术的人文价值.以古典文献中作为媒介传承弓术的数据为基础,将其人文精神概括为四大价值体系.

关键词：弓术教育修身传统文化人格完成自我实现价值

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格斗擂台上传统武者的文化映射及对武术教育的启示

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武术研究 2021年第3期6卷 27-30页

作者：郑志兵朴东哲韩国国立木浦大学体育学院全南木浦586132 .贵州大学体育学院贵州贵阳550025

以现代格斗擂台上的传统武者(事件)为主要研究对象,以武术育人为关注目标,运用多种研究方法,阐述现代格斗擂台上传统武者映射出的文化发展逻辑。在与“技击本质论”的比较中,进一步论述“技击中心观”的概念内涵,并探讨其存在原因。得出... 详细信息

以现代格斗擂台上的传统武者(事件)为主要研究对象,以武术育人为关注目标,运用多种研究方法,阐述现代格斗擂台上传统武者映射出的文化发展逻辑。在与“技击本质论”的比较中,进一步论述“技击中心观”的概念内涵,并探讨其存在原因。得出:武术教育要扬弃本体论,树立主体观;武术教育要注重以现代性视角挖掘发展传统文化;武术教育要体现思想力;武术教育要注重精神发展;武术教育要传导理性精神。

关键词：武术武术教育传统武者精神发展

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传统武术现代性危机审视

四川体育科学 2022年第6期41卷 25-28页

作者：郑志兵朴東哲贵州大学体育学院贵州贵阳550025 韩国国立木浦大学体育学院全南木浦58613

运用文献资料法、逻辑分析法,从现代性的视角对武林“约架”进行了定性研究。认为“约架”事件的多次发生是传统武术现代适应危机的表象,并从与武术相关的大众潜意识的价值判断——“武无第二”和现阶段整体国民心态——“虚骄”两个方... 详细信息

运用文献资料法、逻辑分析法,从现代性的视角对武林“约架”进行了定性研究。认为“约架”事件的多次发生是传统武术现代适应危机的表象,并从与武术相关的大众潜意识的价值判断——“武无第二”和现阶段整体国民心态——“虚骄”两个方面进行了反思。运用大历史观、大武术观,提出了:武术发展的基本历史脉络是“文化”不断将“技击”的外在张力关进“笼子”里的历史过程;武术“技击”和“文化”之间立统一的矛盾是武术发展的根本动力;多场域中武术“技击”和“文化”的动态博弈和平衡是武术发展的基本面貌;传统武术“技击”的最终呈现是“三因素矛盾综合体”等观点。并进一步提出了破除传统武术现代性危机,加快传统武术现代化转型的相关建议。

关键词：武术现代性武无第二大武术观危机审视

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