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Chemically-induced active micro-nano bubbles assisting chemical mechanical polishing:Modeling and experiments

Friction 2023年第9期11卷 1624-1640页

作者： Lei XU Kihong PARK Hong LEI Pengzhan LIU Eungchul kim Yeongkwang CHO taesung kim Chuandong CHEN School of Materials Science and Engineering Shanghai UniversityShanghai 200444China School of Mechanical Engineering Sungkyunkwan UniversityGyeonggi-do 16419Republic of Korea Research Center of Nano Science and Technology Shanghai UniversityShanghai 200444China SKKU Advanced Institute of Nanotechnology Sungkyunkwan UniversityGyeonggi-do 16419Republic of Korea Baotou Research Institute of Rare Earths Baotou 014030China

The material loss caused by bubble collapse during the micro-nano bubbles auxiliary chemical mechanical polishing(CMP)process cannot be *** this study,the material removal mechanism of cavitation in the polishing process was investigated in *** on the mixed lubrication or thin film lubrication,bubble-wafer plastic deformation,spherical indentation theory,Johnson-Cook(J-C)constitutive model,and the assumption of periodic distribution of pad asperities,a new model suitable for micro-nano bubble auxiliary material removal in CMP was *** model integrates many parameters,including the reactant concentration,wafer hardness,polishing pad roughness,strain hardening,strain rate,micro-jet radius,and bubble *** model reflects the influence of active bubbles on material removal.A new and simple chemical reaction method was used to form a controllable number of micro-nano bubbles during the polishing process to assist in polishing silicon oxide *** experimental results show that micro-nano bubbles can greatly increase the material removal rate(MRR)by about 400%and result in a lower surface roughness of 0.17 *** experimental results are consistent with the established *** the process of verifying the model,a better understanding of the material removal mechanism involved in micro-nano bubbles in CMP was obtained.

关键词： micro-nano bubbles mixed lubrication material removal mechanism chemical mechanical polishing(CMP) modeling

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A study of highly activated hydrogen evolution reaction performance in acidic media by 2D heterostructure of N and S doped graphene on MoO_(x)

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Carbon Energy 2023年第11期5卷 68-80页

作者： Kubra Aydin Seongwon Woo Vinit Kaluram Kanade Seulgi Choi Chisung Ahn Byungkwon Lim taesung kim SKKU Advanced Institute of Nanotechnology(SAINT) Department of Nano Science and TechnologySungkyunkwan UniversitySuwon‐siGyeonggi‐doRepublic of Korea School of Advanced Material Science and Engineering Department of Nano Science and TechnologySungkyunkwan UniversitySuwonGyeonggi‐doRepublic of Korea School of Mechanical Engineering Sungkyunkwan UniversitySuwon‐siGyeonggi‐doRepublic of Korea Heat&Surface Technology R&D Department Korea Institute of Industrial TechnologySiheung‐siGyeonggi‐doRepublic of Korea

Herein,a layer of molybdenum oxide(MoO_(x)),a transition metal oxide(TMO),which has outstanding catalytic properties in combination with a carbonbased thin film,is modified to improve the hydrogen production performance and protect the MoO_(x)in acidic media.A thin film of graphene is transferred onto the MoO_(x)layer,after which the graphene structure is doped with N and S atoms at room temperature using a plasma doping method to modify the electronic structure and intrinsic properties of the *** oxygen functional groups in graphene increase the interfacial interactions and electrical contacts between graphene and MoO_(x).The appearance of surface defects such as oxygen vacancies can result in vacancies in MoO_(x).This improves the electrical conductivity and electrochemically accessible surface *** the number of defects in graphene by adding dopants can significantly affect the chemical reaction at the interfaces and improve the electrochemical *** defects in graphene play a crucial role in the adsorption of H^(+)ions on the graphene surface and their transport to the MoO_(x)layer *** enables MoO_(x)to participate in the reaction with the doped graphene.N^(‐)and S^(‐)doped graphene(NSGr)on MoO_(x)is active in acidic media and performs well in terms of hydrogen *** initial overpotential value of 359 mV for the current density of−10 mA/cm^(2)is lowered to 228 mV after activation.

关键词： heteroatom‐doped graphene hydrogen evolution reactions metal‐free catalysts transition metal oxides van der Waals(vdWs)heterostructures

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Mechanical Ventilation Strategy for Subway Cabins Using Numerical Simulations

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Journal of Civil Engineering and Architecture 2012年第8期6卷 1070-1075页

作者： Soon-Bark Kwon Duck-Shin Park Youngmin Cho Jong Bum kim taesung kim Eco-system Research Department Korea Railroad Research Institute Uiwang 437- 757 Korea Department of MechanicaIEngineering Sungkyunkwan University Suwon 440-746 Korea

Seoul metropolitan subway network is known to be the one of the most heavily used transportation means in the world. The subway cabins are naturally ventilated when the cabin doors are opened and through the gaps caused by the incomplete air-tightening of cabin bodies. Although, subway trains are equipped with a mechanical exhaust fan, the apparatus is rarely operated due to the problem of heating/cooling efficiency especially in the summer and winter seasons. In this study, we analyzed the transient CO2 (carbon dioxide) concentration level during the journey of a subway cabin when a heavy load of passengers of up to 200% of designed capacity using a CFD (computational fluid dynamics) analysis. With an increased journey time, the CO2 concentration increased by up to 5,000 ppm depending on passenger load. Through the operation of a mechanical exhaust fan, the high concentration of CO2 decreased down to 1,500 ppm. The effect of the exhaust fan operating on the dilution of indoor air was estimated by comparison with a closed cabin. In addition, the energy consumption for cooling in summer time was assessed for exhaust fan operations.

关键词：地铁网络机械通气数值模拟 CO2浓度增加计算流体动力学冷却效率浓度水平二氧化碳

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无功率损耗的电缆压降补偿

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中国电子商情 2013年第8期 36-38页

作者： Gwanbon Koo taesung kim 飞兆半导体公司

由于常用控制器的内部不包括电缆压降补偿功能，如果未专门针对电池充电系统设计控制器，则必须用尽可能少的元件数从外部实施补偿。为实现良好的电缆压降补偿，应准确测量或估计负载电流。根据获取负载电流的方法，有两种现有解决方案。

关键词：电缆损耗功率补偿功能控制器电流负载充电

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导入电缆压降补偿功能使移动设备充电更快速

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中国电子商情 2013年第7期 47-49页

作者： Gwanbon Koo taesung kim 飞兆半导体

智能手机和平板设备充电时间可望大幅缩短。具备电缆压降补偿功能的充电器，由于可根据负载电流的压降比进行输出电压补偿，让电池终端的电压保持恒定，从而达到快速充电的目的，因而已日益受到移动设备开发人员青睐。

关键词：移动设备补偿功能充电器电缆导入输出电压智能手机设备开发

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Correlation assessment and monitoring of the potential pollutants in the surface sediments of Pyeongchang River,Korea

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International Journal of Sediment Research 2011年第2期26卷 152-162页

作者： Md.Imran KABIR Hosik LEE Geonha kim taesung JUN Environmental Water Quality Lab Department of Environmental EngineeringChungju National University Department of Environmental Engineering Chungju National University Department of Civil and Environmental Engineering Hannam University

The study provides a baseline for the assessment of the organic and inorganic pollution specially, heavy metal contamination in the surface sediments of Pyeongchang River,South *** assessment of the study areas was done with respect to metal pollution load,ecological risk and geoaccumulated *** upon the used indices,a priority index(P) was used to rank the utmost contaminated *** the concentrations of mercury in all sediments were below the guideline, the significant enriched contamination was observed by all applied *** expected,the values of pollution load index(PLI),ecological risk index(RI) and geoaccumulation risk index(I) demonstrated lower heavy metal contamination in upstream areas compared to the downstream. Admittedly,sediments were unpolluted to slightly-polluted according to PLI while high to extremely high ecological risks were observed in several sediment ***,all the samples were uncontaminated as per *** simplification of I,the P,showed the utmost contaminated sediments with a value of ***,protective measures should be taken to the highly contaminated areas which are prioritized by PAdmittedly,the maximum concentrations of total organic carbon,total nitrogen,inorganic nitrogen,total phosphorous,inorganic phosphorous,calcium, magnesium,sodium and potassium were significantly observed as 7.8×10~4,3,185,36,1,032,3.7, 1,5163,2,881,669 and 4,076mg/kg accordingly.

关键词： Heavy metals Sediments Pollution load index Ecological risk index Simplified geoaccumulation risk index Priority index

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Carbon Nanotube Coating on Titanium Substrate Modified with TiO_2 Nanotubes

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Journal of Wuhan University of Technology(Materials Science) 2011年第5期26卷 867-871页

作者：白玉 PARK Ilsong BAE taesung kim Kyounga WATARI Fumio UO Motohiro LEE Minho Department of Dental Biomaterials School of Dentistry and Institute of Oral BioscienceBrain Korea 21 ProjectChonbuk National University School of Materials Science and Engineering Inner Mongolia University of Technology Department of Conservative Dentistry Institute of Oral Bioscience and BK 21 ProjectSchool of DentistryChonbuk National University Biomedical Dental Materials and EngineeringDepartment of Oral Health ScienceGraduate School of Dental MedicineHokkaido University Advanced Biomaterials Section Graduate School of Medical and Dental SciencesTokyo Medical and Dental University

A combination of carbon nanotubes （CNTs） and titanium （Ti） modified with TiO2 nanotubes （TiO2 NTs） was fulfilled with the aim of improving bioactivity of Ti ***,well-ordered TiO2 NTs were prepared by the electrochemical anodization of Ti in an ethylene glycol electrolyte containing 1 wt% NH4F and 10 wt% H2O at 20 V for 50 min,followed by ***,the carboxylated CNTs were coated onto the TiO2 NTs using electrophoretic deposition （EPD） *** growth of hydroxyapatite （HA） on the samples was investigated by soaking them in simulated body fluid （SBF）.The result showed the CNTs-coated Ti with the modification of TiO2 NTs （CNTs-TiO2 NTs） was more efficient to induce HA formation than the CNTs-coated smooth Ti （CNTs-Ti）.The vitro cell response was evaluated using osteoblast cells （MC3T3-E1）.The good cell proliferation and strong cell adhesion could be obtained on the CNTs-TiO2 *** results indicated that CNT coating on the Ti modified with TiO2 NTs could be potentially useful for the periodontal ligament combination on dental implants.

关键词： carbon nanotubes TiO2 nanotubes apatite-forming ability cell adhesion

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Spatio-temporal change in forest cover and carbon storage considering actual and potential forest cover in South Korea

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Science China(Life Sciences) 2015年第7期58卷 713-723页

作者： NAM Kijun LEE Woo-Kyun kim Moonil KWAK Doo-Ahn BYUN Woo-Hyuk YU Hangnan KWAK Hanbin KWON taesung SUNG Joohan CHUNG Dong-Jun LEE Seung-Ho Division of Environmental Science and Ecological Engineering Korea University GIS/RS Center for Environmental Resources Korea University Division of Forest Ecology Korea Forest Research Institute National Forestry Cooperative Federation Division of Forest Economics & Management Korea Forest Research Institute

This study analyzes change in carbon storage by applying forest growth models and final cutting age to actual and potential forest cover for six major tree species in South Korea. Using National Forest Inventory data, the growth models were developed to estimate mean diameter at breast height, tree height, and number of trees for Pinus densiflora, Pinus koraiensis, Pinus rigida, Larix kaempferi, Castanea crenata and Quercus spp. stands. We assumed that actual forest cover in a forest type map will change into potential forest covers according to the Hydrological and Thermal Analogy Groups model. When actual forest cover reaches the final cutting age, forest volume and carbon storage are estimated by changed forest cover and its growth model. Forest volume between 2010 and 2110 would increase from 126.73 to 157.33 m3 hm-2. Our results also show that forest cover, volume, and carbon storage could abruptly change by 2060. This is attributed to the fact that most forests are presumed to reach final cutting age. To avoid such dramatic change, a regeneration and yield control scheme should be prepared and implemented in a way that ensures balance in forest practice and yield.

关键词：森林覆盖率时空变化韩国碳结合森林蓄积量存储采伐年龄森林资源清查

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Clinical validation of scoring systems of postoperative pancreatic fistula after pancreatoduodenectomy: applicability to Eastern cohorts?

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Hepatobiliary Surgery and Nutrition 2019年第3期8卷 211-218页

作者： Jae Seung Kang taesung Park Youngmin Han Seungyeon Lee Jae Ri kim Hongbeom kim Wooil Kwon Sun-Whe kim Jin Seok Heo Seong Ho Choi Dong Wook Choi Song Cheol kim Tae Ho Hong Dong Sup Yoon Joon Seong Park Sang Jae Park Sung-Sik Han Sae-Byeol Choi Joo Seop kim Chang-Sup Lim Jin-Young Jang Department of Surgery and Cancer Research Institute Seoul National University College of MedicineSeoulRepublic of Korea Department of Statistics and Interdisciplinary Program in Biostatistics Seoul National UniversitySeoulRepublic of Korea Department of Mathematics and Statistics Sejung UniversitySeoulRepublic of Korea Department of Surgery Samsung Medical CenterSungkyunkwan University School of MedicineSeoulRepublic of Korea Division of Hepatobiliary and Pancreatic Surgery Department of SurgeryUlsan University College of Medicine and Asan Medical CenterSeoulRepublic of Korea Department of Surgery Seoul St.Mary’s HospitalThe Catholic University of KoreaCollege of MedicineSeoulRepublic of Korea Pancreatobiliary Cancer Clinic Department of SurgeryGangnam Severance HospitalYonsei University College of MedicineSeoulRepublic of Korea Center for Liver Cancer National Cancer CenterGyeonggidoRepublic of Korea Department of Surgery Korea University Guro HospitalKorea University College of MedicineSeoulRepublic of Korea Department of Surgery Kangdong Sacred Heart HospitalHallym University College of MedicineSeoulRepublic of Korea Department of Surgery Seoul Metropolitan Government-Seoul National University Boramae Medical CenterSeoul National University College of MedicineSeoulRepublic of Korea

Background:Although several prediction models for the occurrence of postoperative pancreatic fistula(POPF)after pancreatoduodenectomy(PD)exist,all were established using Western ***-scale external validation studies in Eastern cohorts that consider demographic variables including lower body mass index(BMI)are *** purpose of this study was to externally validate POPF prediction models using nationwide large-scale Korean ***:Nine tertiary university hospitals in the Republic of Korea ***'preoperative characteristics,intraoperative factors,and pathologic findings were *** grades were determined according to the 2016 International Study Group on Pancreatic Surgery *** POPF risk models(Callery,Roberts,and Mungroop)were selected for external ***:A total of 1,898 PD patients were enrolled.A non-pancreatic disease diagnosis[hazard ratio(HR),1.856;95%confidence interval(CI),1.223–2.817;P=0.004),higher preoperative BMI(HR,1.069;95%CI,1.019–1.121;P=0.006),and soft pancreatic texture(HR,1.859;95%CI,1.264–2.735;P=0.002)were independent risk factors for clinically relevant POPF(CR-POPF).The area under the receiver operating characteristic curve(AUC)values were 0.61,0.64,and 0.63 on the Callery,Roberts,and Mungroop models,respectively;all were lower than those published in each external validation ***:Western POPF prediction models performed less well when applied to Korean ***,a large-scale Eastern-specific and externally validated POPF prediction model is needed.

关键词： Pancreatic fistula pancreatoduodenectomy(PD) predictive score

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