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Local Energy and Planned Ramping Product Joint Market Based on a Distributed Optimization Method

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CSEE Journal of Power and Energy Systems 2021年第6期7卷 1357-1368页

作者： Zhong Zhang Furong Li Sung-Won park Sung-yong Son Dalian University of Technology DalianChina Department of Electronic and Electrical Engineering University of BathBathU.K. the University of Bath BathU.K. the Department of Electrical and Electronic Engineering Youngsan UniversitySouth Korea Gachon University SeoulSouth Korea

High penetration of renewable energy generation(REG)in the distribution system increases both the power uncertainty at a given interval and the power variation between two *** markets addressing power uncertainty have been widely ***,there is a lack of market mechanisms regarding the power variation of the load and *** paper thus defines a planned ramping(PR)product to follow the net load variation and extends the local energy market to include the trading of PR *** are economically compensated for their PR *** models of dispatchable generators and flexible load aggregators in the joint market are *** solve the market problem in polynomial time,a distributed market clearing method is developed based on the ADMM *** joint market is tested on a modified IEEE 33-bus *** verifies that introducing the PR market can encourage flexible loads to provide more PR service to accommodate the net load *** such,the ramping cost of dispatchable generators is reduced by 29.09%in the test *** planned energy curtailment from REG is also *** computational efficiency of the proposed distributed clearing method is validated by comparing it with a centralized method.

关键词： Distributed market clearing flexible load aggregator local electricity market planned ramping product renewable energy generation

Removal characteristics of CO_2 using aqueous MEA/AMP solutions in the absorption and regeneration process

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Journal of Environmental Sciences 2009年第7期21卷 907-913页

作者： Won-Joon Choi Jong-Beom Seo Sang-yong Jang Jong-Hyeon Jung kwang-Joong Oh Greenhouse Gas Research Center Korea Institute of Energy Research Daejeon 305343 Korea Department of Environmental Engineering Pusan National University Busan 609735 Korea Department of Health Administration Sorabol College Gyeongju 780711 Korea

The carbon dioxide （CO2） removal efficiency, reaction rate, and CO2 loading into aqueous blended monoethanolamine （MEA）＋ 2-amino-2-methyl-l-propanol （AMP） solutions to enhance absorption characteristics of MEA and AMP were carried out by the absorption/regeneration process. As a result, compared to aqueous MEA and AMP solutions, aqueous blended MEA ＋ AMP solutions have a higher CO2 loading than MEA and a higher reaction rate than AMP. The CO2 loading of rich amine of aqueous 18 wt.% MEA ＋ 12 wt.% AMP solution was 0.62 mol CO2/mol amine, which is 51.2% more than 30 wt.% MEA （0.41 mol CO2/mol amine）. Consequently, blending MEA and AMP could be an effective way to design considering economical efficiency and used to operate absorber for a long time.

关键词： carbon dioxide monoethanolamine 2-amino-2-methyl-1-propanol absorption regeneration

Development of a valid and reliable seven emotions impairment questionnaire and assessment of its predictability for phlegm and blood stasis

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Journal of Traditional Chinese Medicine 2016年第4期36卷 547-554页

作者： Byoung-Hee Lee Min-yong Kim Young-Bae park Young-Jae park Department of Diagnosis and Biofunctional Medicine College of Korean MedicineKyung Hee University Seou102447 Korea Business School Kyung Hee UniversitySeou 102447 Korea Department of Diagnosis and Biofunctional Medicine College of Korean Medicine Kyung Hee University Seoul 02447 Korea Department of Diag-nosis and Biofunctional Medicine Kyung Hee UniversityHospital at Gangdong Seoul 05278 Korea.

OBJECTIVE:To develop and validate a Seven Emotions Impairment questionnaire(SEIQ),to define an optimum cut-off point for the SEIQ,and to examine whether SEI was predictive of Phlegm and Blood Stasis(BS).METHODS:Two hundred outpatients and 75 college students were asked to complete the SEIQ,the Profile of Mood States(POMS),Phlegm Pattern Questionnaire(PPQ),and BS Questionnaire(BSQ).Twelve clinicians determined whether the outpatients exhibited *** data were used to examine the internal consistency and determine validity for the ***,POMS,PPQ,and BSQ data were used to examine concurrent validity and predictability of SEI for Phlegm and BS in the college *** SEIQ scores and the clinicians' diagnoses of the outpatients were considered to define an optimum cut-off score for the ***:The 18-item SEIQ had satisfactory internal consistency(α = 0.905) and concurrent *** the construct validity test,four factors(chest-anxiety,fatigue-depression,working-family-troubles,and sleep-memory) were *** the receiver operator characteristic curve curve analysis,the sensitivity,specificity,and area under the curve of the SEIQ were 67.2%,72.1%,and 73%,*** optimum cut-off score was defined as nine *** scores were strongly predictive of Phlegm and BS(β = 0.862 and 0.673,respectively).CONCLUSION:Based on our results,we concluded that the SEIQ is a reliable and valid instrument for evaluating SEI,and is strongly predictive of Phlegm and BS.

关键词： Seven emotions Intermingled phlegm and blood-stasis Surveys and questionnaires Diagnosis Reference standards Mental health

Modeling and Design of H-Infinity Controller for Piezoelectric Actuator LIPCA

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Journal of Bionic Engineering 2010年第2期7卷 168-174页

作者： Gigun Lee Kwanwoo You Taesam Kang kwang Joon Yoon Jeong Oog Lee Jung Keun park Department of Aerospace Information Engineering Konkuk University

We proposed a dynamic model identification and design of an H-Infinity （i.e.H） controller using a LightweightPiezo-Composite Actuator （LIPCA）.A second-order dynamic model was obtained by using input and output data, and applyingan identification *** identified model coincides well with the real *** reduce the resonating mode that istypical of piezoelectric actuators, a notch filter was used.A feedback controller using the Hcontrol scheme was designed basedon the identified dynamic model; thus, the LIPCA can be easily used as an actuator for biomemetic applications such as artificialmuscles or macro/micro positioning in *** control algorithm was implemented using a microprocessor, analogfilters, and power amplifying *** simulation and experimental results demonstrate that the proposed control algorithmworks well in real environment, providing robust performance and stability with uncertain disturbances.

关键词： piezoelectric actuator model identification H-infinity controller biomimetic artificial muscle LIPCA

Mechanical and electrical properties of In-Bi solder at Bi_(2212) superconductor interface with annealed Ag spray layers and Ag precoating layers

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中国有色金属学会会刊：英文版 2009年第4期19卷 961-964页

作者： Seung-yong SHIN Ji-Hyun LEE Hai-Woong park Department of Materials Engineering Korea University of Technology and Education(KUT)

The electrical properties of solder contact layers between Cu-Ni shunt metal and tube type Bi2212 superconductor that is applied in superconducting fault current limiter were *** contact properties of the solders are improved not only by Ag precoating layers,but also by the pre-sprayed Ag layer and subsequent Ag precoating *** annealed Ag sprayed layers onto Bi2212 superconductor prior to Ag electroplating work as protecting layers for the superconductor from plating *** contact angle of the electroplated Ag layer is 42.91° and decreases to 15.25° and 5.88° with Ag sprayed layer and additional Ag electroplated *** Ag sprayed layer with suitable annealing prior to Ag electroplating improves contact strength of the Ag electroplated layer by about 12% due to denser microstructure of the Ag electroplated layers.

关键词：超导故障限流器 Bi2212 电镀银电气性能喷涂层预涂层退火焊料

Friction stir welding of 5052 aluminum alloy plates

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中国有色金属学会会刊：英文版 2009年第B09期19卷 23-27页

作者： yong-Jai KWON Seong-Beom SHIM Dong-Hwan park School of Materials Science and Engineering University of Ulsan Institute of E-Vehicle Technology University of Ulsan

Friction stir welding between 5052 aluminum alloy plates with a thickness of 2 mm was performed. The tool for welding was rotated at speeds ranging from 500 to 3000 r/min under a constant traverse speed of 100 mm/min. The results show that at all tool rotation speeds, defect-free welds are successfully obtained. Especially at 1000, 2000 and 3000 r/min, the welds exhibit very smooth surface morphologies. At 500, 1000, and 2000 r/min, onion ring structure is clearly observed in the friction-stir-welded zone (SZ). In addition, the onion ring structure region becomes wider as the tool rotation speed is increased. The gain size in the SZ is smaller than that in the base metal, and is decreased with a decrease of the tool rotation speed. In all tool rotation speeds, the SZ exhibits higher average hardness than the base metal. Especially at 500 r/min, the average hardness of the SZ reaches a level about 33% greater than that of the base metal. At 500, 1 000 and 2 000 r/min, the tensile strength of the friction stir welded (FSWed) plates is similar to that of the base metal (about 204 MPa). The elongation of the FSWed plates is lower than that of the base metal (about 22%). However, it is noticeable that the maximum elongation of about 21% is obtained at 1 000 r/min.

关键词：搅拌摩擦焊接铝合金板旋转速度焊接工具表面形貌环形结构抗拉强度伸长率

An updated narrative review of treatment for limbal epithelial stem cell deficiency

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Annals of Eye Science 2023年第3期8卷 1-10页

作者： Choul yong park Department of Ophthalmology Dongguk UniversityIlsan HospitalGoyangSouth Korea

Background and Objective:Nearly 30 years have passed since limbal stem cell deficiency(LSCD)was first identified by pioneers and given clinical *** remains a difficult disease to *** can potentially lead to *** present,understanding of limbal stem cells(LSCs)has deepened and various treatment options for LSCD have been *** objective of this review is to summarize basic knowledge of LSCD and current treatment ***:PubMed search was performed to find studies published in English on LSCs and LSCD including original reports and *** published from 1989 to 2022 were *** Content and Findings:LSCs are enigmatic stem cells for which no specific marker has been discovered *** LSCD is not difficult to diagnose,it is still challenging to *** important advancement in the treatment of LSCD is the provision of guidelines for selecting systematic surgical treatment according to the patient’s *** is also encouraging that stem cell technologies are being actively investigated for their potential usefulness in the treatment of ***:Although various treatment options for LSCD have been developed,it should be kept in mind that the best chance of treatment for LSCD is in the early stage of the *** effort should be made to preserve as many LSCs as possible in the early treatment of LSCD.

关键词： Limbus stem cell cornea deficiency transplantation

Influence of haze pollution on water-soluble chemical species in PM2.5 and size-resolved particles at an urban site during fall

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Journal of Environmental Sciences 2017年第7期29卷 370-382页

作者： Geun-Hye Yu Yan Zhang Sung-yong Cho Seungshik park Department of Environment and Energy Engineering Chonnam National UniversityGwangju 61186Republic of Korea

To investigate the influence of haze on the chemical composition and formation processes of ambient aerosol particles,PM_（2.5） and size-segregated aerosol particles were collected daily during fall at an urban site of Gwangju,*** the study period,the total concentration of secondary ionic species（SIS） contributed an average of 43.9% to the PM_（2.5） ,whereas the contribution of SIS to the PM_（2.5） during the haze period was 62.3%.The NO_3 and SO^（2-）_4 concentrations in PM_（2.5） during the haze period were highly elevated,being 13.4 and 5.0 times higher than those during non-haze period,*** PM,NO^-_3,SO^（2-）_4,oxalate,water-soluble organic carbon（WSOC）,and humic-like substances（HULIS） had tri-modal size distributions peaks at 0.32,1.0,and 5.2 μm during the non-haze and haze ***,during the non-haze period they exhibited dominant size distributions at the condensation mode peaking at 0.32 μm,while on October 21 when the heaviest haze event occurred,they had predominant droplet mode size distributions peaking at 1.00 μ***,strong correlations of WSOC and HULIS with SO^（2-）_4,oxalate,and K＋at particle sizes of 〈 1.8 μm indicate that secondary processes and emissions from biomass burning could be responsible for WSOC and HULIS *** was found that the factors affecting haze formation could be the local stable synoptic conditions,including the weak surface winds and high surface pressures,the long-range transportation of haze from eastern China and upwind regions of the Korean peninsula,as well as the locally emitted and produced aerosol particles.

关键词： Haze pollution Size distribution Secondary ionic species Humic-like substances Stable synoptic conditions

Progress of Materials and Devices for Neuromorphic Vision Sensors

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Nano-Micro Letters 2022年第12期14卷 239-271页

作者： Sung Woon Cho Chanho Jo yong-Hoon Kim Sung Kyu park Department of Electrical and Electronics Engineering Chung-Ang UniversitySeoul 06974Republic of Korea Department of Advanced Components and Materials Engineering Sunchon National UniversitySunchŏnJeonnam 57922Republic of Korea School of Advanced Materials Science and Engineering Sungkyunkwan UniversitySuwon 16419Republic of Korea SKKU Advanced Institute of Nanotechnology(SAINT) Sungkyunkwan UniversitySuwon 16419Republic of Korea

The latest developments in bio-inspired neuromorphic vision sensors can be summarized in 3 keywords:smaller,faster,and smarter.(1)Smaller:Devices are becoming more compact by integrating previously separated components such as sensors,memory,and processing *** a prime example,the transition from traditional sensory vision computing to in-sensor vision computing has shown clear benefits,such as simpler circuitry,lower power consumption,and less data redundancy.(2)Swifter:Owing to the nature of physics,smaller and more integrated devices can detect,process,and react to input more *** addition,the methods for sensing and processing optical information using various materials(such as oxide semiconductors)are evolving.(3)Smarter:Owing to these two main research directions,we can expect advanced applications such as adaptive vision sensors,collision sensors,and nociceptive *** review mainly focuses on the recent progress,working mechanisms,image pre-processing techniques,and advanced features of two types of neuromorphic vision sensors based on near-sensor and in-sensor vision computing methodologies.

关键词： In-sensor computing Near-sensor computing Neuromorphic vision sensor Optoelectronic synaptic circuit Optoelectronic synapse