Influence of Surface Charges/Chemistry on the Catalysis of Perovskite Complexes

Park, Seungkyu,Nam, Gyutae,Lee, Jang-Soo,Cho, Jaephil,Jung, Jae-Il American Chemical Society 2018 ACS APPLIED MATERIALS & INTERFACES Vol.10 No.34

<P>The electrochemical performance of the perovskite complex was discovered to depend greatly on the different locations of the identical particle, which represent different surface charges accordingly. The surface charges were evaluated by Zeta potential (ζ) for the intrinsic BSCF5582 (Ba<SUB>0.5</SUB>Sr<SUB>0.5</SUB>Co<SUB>0.8</SUB>Fe<SUB>0.2</SUB>O<SUB>3<I>-δ</I></SUB>), ball-milled (BM-BSCF5582), and heat-treated in an oxygen atmosphere after ball-milling (48h-O<SUB>2</SUB>-BM-BSCF5582), the mean ζ of which represents −11.1, 21.2, and −6.1 mV, respectively, which reflects well on different surface chemistries. When the bonding structures at the different stratified layers and the overall crystalline morphologies were analyzed via X-ray photoelectron spectroscopy and high resolution transmission electron microscopy, respectively, the crystalline- and bonding-structure at the 50 nm depth of BSCF5582 is nearly identical to that of BM-BSCF5582 at the surface. As ball-milling proceeds, not only are particles comminuted but also the amorphous surface is broken open, leading to the revelation of inner and naïve cubic crystalline phase surfaces and affecting the catalytic activities of oxygen evolution reactions and oxygen reduction reactions positively and negatively, respectively, at significant scales.</P> [FIG OMISSION]</BR>

Robust T-S Fuzzy H<SUB>∞</SUB> Control of Interior Permanent Magnet Motor using Weighted Integral Action

Seungkyu Park,Hokyun Ahn 제어로봇시스템학회 2014 제어로봇시스템학회 국제학술대회 논문집 Vol.2014 No.10

This paper presents a robust T-S Fuzzy controller with a weighted integral action for Permanent Magnet Synchronous Motor which have nonlinear dynamics. The T-S Fuzzy controller is used for the robustness of nonlinear systems and the weighted integral action is used for the improvement of control performance. A T-S Fuzzy controller is designed by combining the local controllers with the overall stability, and LMI(Linear Matrix Inequality)is used to determine the gains of linear controllers. The control performance of PMSM is changed into regulator problem by introducing the integral action and the weighting factor gives flexibility to a T-S fuzzy controller.

A Backstepping Design with Sliding Mode Control for Uncertain Discrete Systems

Park Seungkyu,Kim Minchan,Ahn Hokyun 제어로봇시스템학회 2002 제어로봇시스템학회 국제학술대회 논문집 Vol.2002 No.10

T-S Fuzzy Control of IPMSM Using Backstepping Integral Sliding Mode

Seungkyu Park,Taesung Yoon,Gunpyung Kwak,Hokyun Ahn 제어로봇시스템학회 2015 제어로봇시스템학회 국제학술대회 논문집 Vol.2015 No.10

This paper aims to design a robust controller for the Interior Permanent Magnet Synchronous Motor (IPMSM) based on the Takagi-Sugeno (T-S) fuzzy modeling, the sliding mode control(SMC) and the back-stepping control. The introduction of T-S fuzzy model is for the clearer description of nonlinear uncertainties and reduces computational burden, and the back-stepping technique for the considering of the load disturbance under the inevitable matching condition in the SMC. The Integral SMC is used for the problem of reaching phase.

위상최적설계를 이용한 BLDC 모터의 자석 설계

박승규(Seungkyu Park),강제남(Jenam Kang),왕세명(Semyung Wang),노정채(Jungchae Noh) 대한전기학회 2003 대한전기학회 학술대회 논문집 Vol.2003 No.7

인구·경제·재정·사회환경 변화에 따른 기술교육의 지역경제 효과 비교

박승규(Park, Seungkyu) 한국지역개발학회 2020 韓國地域開發學會誌 Vol.32 No.2

In order to find the role of human capital accumulation of general and technical vocational education on regional economies from 1992 to 2017, this study used Ramsey-Cass-Koopmans model and panel system to empirically estimate the relationship of the school-age population, which affected to the human capital by technical vocational education, and total fertility rate. In the Seoul metropolitan area (SMA), the steady-state of regional economic factors increased due to the human capital accumulation through technical vocational education of general school. On the other hand, the steady-state of regional economic factors in non-capital area (ROW) also increased due to the human capital accumulation of general and technical vocational education. In addition, changes in human capital due to general vocational education have increased the steady-state of regional economic factors by population inflow, increase of the number of marriages, and gross domestic product per capita, but has been reduced by prices in both SMA and ROW. On the other hand, changes in human capital due to technical vocational education have led to an higher increase in the steady-state of regional economic factors due to an increase in population inflows, GRDP per capita, and marriages except price change in ROW.

삶의 질 결정요인 파악을 통한 문화 재정지원의 경제적 영향 분석

박승규(Seungkyu Park) 한국문화경제학회 2019 문화경제연구 Vol.22 No.1

삶의 질에 대한 관심은 지속적으로 증대하고 있으며, 최근 일과 삶의 균형으로 인해 문화 및 여가활동에 대한 중요도가 점차 증대되고 있다. 반면, 중앙 및 지방정부에서 공급하는 문화 및 여가 환경에 대한 주민들의 체감 정도는 파악하기가 쉽지 않다. 따 라서, 본 연구는 (현)대통령직속균형발전위원회의 229개 시군구 대상 6,920개의 지역 주민 행복도 조사를 활용하여 지역별 주민 삶의 질에 미치는 결정요인을 파악하며, 이 중 문화부문에 대한 추가적인 정부투자를 통한 문화부문 재정지원의 거시경제적인 영 향을 실증적으로 파악하는 것을 연구의 목적으로 한다. 분석결과 지역간 문화시설에 대한 객관적인 시설 총량 및 주관적인 만족도의 격차가 지역별로 여전히 존재하였다. 반면, 서비스의 특성에 따라 유사한 서비스의 경우 지자체 간 권역 설정을 통한 서비스의 공동 공급 및 사용으로 삶의 질은 향상되며 특히, 문화· 복지·의료 분야에서의 지역격차는 감소하는 결과가 나타났다. 더불어, 생활편의시설 공 급에 비해 상대적으로 중요도가 낮게 평가되었던 문화부문에 대한 재정지원을 정부투자 에 따른 소비세 감소, 지원금 증가, 자본확충 증가로 고려할 경우 문화부문에 대한 정부 투자는 문화부문 가격의 감소에 따른 소비 진작으로 가계의 효용이 증가되는 결과가 도 출되었다. 따라서, 본 연구는 주민 삶의 질에 영향을 미치는 문화부문에 대한 만족도는 문화부문에 대한 정부투자 증가로 인해 증가될 수 있는 실증적인 결과를 제공하였다. The interest in quality of life is steadily increasing and the importance of culture and leisure activities is increasing due to recent work-life balance. On the other hand, it is difficult to grasp the residents perceptions of cultural and leisure environment supplied by central and local governments. Therefore, the purpose of this study is to determine the determinants of local residents quality of life by using 6,920 local residents’ happiness survey of 229 cities and districts by Presidential Committee for Balanced Regional Development, and to empirically grasp the macroeconomic effects of financial support for culture sector. As a result, there is still regional disparity in objective facilities and subjective satisfaction for cultural facilities. However, in case of similar services according to characteristics of service, quality of life is improved by joint supply and use of services in regional level, and the regional disparities in culture, welfare, and medical care have decreased. In addition, government investment in the cultural sector, such as decrease in consumption tax, increase in financial support, and capital raising, was considered to reflect the increase of government investment through the financial support for the cultural sector have been relatively low importance rated compare to living facilities. As a result, the decrease in the price contrast to the increase of consumption led to increase of utility in the household. Therefore, this study showed that the resident’s satisfaction of the cultural sector was increased due to the increase of the government investment in the cultural sector.

빅데이터를 활용한 고령자 1인가구 변화의 지방재정 복지 예산 및 시설 변화 실증분석

박승규(Park, Seungkyu) 한국지방정부학회 2021 지방정부연구 Vol.25 No.1

본 연구는 2015~2016년 제주도 읍면동 인구를 활용하여 2046년까지의 인구구조 및 고령자 1인가구를 추정하고 고령자 1인가구에 따라 변화되는 관련 복지예산과 복지시설과의 관계를 패널연립방정식을 활용하여 실증적으로 분석하는 것을 연구의 목적으로 한다. 이를 위해 고용, 의료, 복지, 안전관련 복지예산은 고령자 1인가구 증가에 의해 증가되었으며, 복지시설총수 역시 증가하였다. 특히, 관련 복지예산 변화에 의해 고령자 1인가구가 변화되는 순환구조를 파악하였다. 또한, 외생변수로 구분되는 주민등록인구, 1차 산업 종사자, 1인당 지역내총생산, 노인복지 및 의료복지시설 현원 변화를 고려하여 고령자 1인가구, 복지시설총수, 관련 복지예산 변화를 시뮬레이션으로 분석하였다. 시나리오 분석결과, 고용, 재정, 대체시설 여건이 개선될수록 고령자 1인가구는 감소하였으나, 관련 복지예산 및 복지시설총수는 증가하였다. 반면, 의료복지시설이 증가할 경우에는 고령자 1인가구는 증가하였지만 관련 복지예산 및 복지시설총수는 증가는 최소화되었다. 따라서, 증가 추세의 고령자 1인가구 증가에 대비하기 위해서는 의료복지시설에 대한 확충을 통한 대응이 보다 효율적인 것으로 분석되었다. The purpose of the study is to analyze empirically the relationship between the related welfare budget and welfare facilities according to the elderly single-person household by estimating population structure and elderly single-person households until 2046 with utilizing municipal regions of Jeju special self governing province from 2015 to 2016. As a result of panel system, the welfare budget related to employment, medical care, welfare, and safety increased due to an increase in the number of elderly single-person households, and also, the total number of welfare facilities increased. In particular, the circular structure in which single-person elderly households change due to changes in related welfare budgets was identified. In addition, changes in the number of elderly single-person households, total number of welfare facilities, and related welfare budgets were analyzed with considering changes in exogenous variables of the resident registration population, primary industry workers, gross regional product per capita, elderly welfare and medical welfare facilities. As a result of the scenario analysis, as the conditions of employment, finance, and alternative facilities improved, the number of single-person elderly persons decreased, but the number of related welfare budgets and welfare facilities increased. On the other hand, when the number of medical welfare facilities increased, while the number of elderly single-person households increased, the related welfare budget and the total number of welfare facilities was minimized. In other words, this study shows clue for more efficient response through expansion of medical welfare facilities in order to prepare for the increasing number of elderly single-person households.

Three-dimensional analysis of the anterior loop of the inferior alveolar nerve in relation to the growth pattern of the mandibular functional subunit

Yoon, Seungkyu,Kim, Jae-Young,Jeong, Cheol-Hee,Park, Jengbin,Huh, Jong-Ki,Park, Kwang-Ho Korean Association of Maxillofacial Plastic and Re 2018 Maxillofacial Plastic Reconstructive Surgery Vol.40 No.-

Background: The purpose of the present study was to investigate the differences in the position and shape of the anterior loop of the inferior alveolar nerve (ALIAN) in relation to the growth pattern of the mandibular functional subunit. Methods: The study was conducted on 56 patients among those who had undergone orthognathic surgery at the Gangnam Severance Hospital between January 2010 and December 2015. Preoperative computerized tomography (CT) images were analyzed using the Simplant OMS software (ver.14.0 Materialise Medical, Leuven, Belgium). The anterior and inferior lengths of ALIAN (dAnt and dInf) and each length of the mandibular functional subunits were measured. The relationship between dAnt, dInf, and the growth pattern of the mandibular subunits was analyzed. Results: The length of the anterior portion of ALIAN (dAnt) reached 3.34 ± 1.59 mm in prognathism and 1.00 ± 0.97 mm in retrognathism. The length of the inferior portion of ALIAN (dInf) reached 6.81 ± 1.33 mm in prognathism and 5.56 ± 1.34 mm in retrognathism. The analysis of Pearson's correlation coefficiency on all samples showed that the lengths of functional subunits were positively correlated with the loop depth. The length of the symphysis area in prognathic patients was positively correlated with the anterior loop depth (p = 0.005). Conclusions: Both the anterior and inferior length of ALIAN are longer in prognathic patients. Especially, it seems to be associated with the growth of the symphysis area.

인구･경제･재정･사회환경 변화에 따른 기술교육의 지역경제 효과 비교

박승규(Park, Seungkyu) 한국지역개발학회 2020 韓國地域開發學會誌 Vol.32 No.2

본 연구는 인문계 및 실업계 기술교육에 의한 인적자본 축적의 변화를 도출하기 위하여 기술교육 인적자본에 영향을 미치는 학령인구와 합계출산율에 의한 패널연립방정식으로 인과관계를 추정하였다. 수도권은 주로 인문계 기술교육에 의한 인적자본 축적에 의해서 생산, 소비, 임금, 투자, 효용의 균제상태가 증가하는 것으로 나타난 반면, 비수도권은 인문계 외 실업계 기술교육으로 인한 인적자본 축적에 의해서도 균제상태가 증가하였다. 또한, 인문계 기술교육으로 인한 인적자본 변화는 해당 지역으로의 인구유입, 혼인건수 증가, 1인당 지역내총생산에 의해서 생산, 소비, 임금, 투자, 효용의 균제상태가 증가하였으며, 물가 및 지방세에 의해서 균제상태가 감소하였다. 반면, 실업계 기술교육으로 인한 인적자본 변화는 인구유입, 혼인건수, 재정자립도의 증가에 의해서 생산, 소비, 임금, 투자, 효용의 균제상태가 증가하였으며, 수도권은 물가에 의해서 균제상태가 감소하고 비수도권은 지방세에 의해서 감소되는 차이가 발생하였다. 더불어, 수도권은 1인당 지역내총생산에 의한 지역 부가가치 증가에 의해서 생산, 소비, 임금, 투자, 효용의 균제상태가 증가한 반면, 비수도권은 재정자립도 증가에 의해서 생산, 소비, 임금, 투자, 효용의 균제상태가 증가하는 차별적인 결과가 도출되었다. In order to find the role of human capital accumulation of general andtechnical vocational education on regional economies from 1992 to 2017, this study usedRamsey-Cass-Koopmans model and panel system to empirically estimate the relationshipof the school-age population, which affected to the human capital by technicalvocational education, and total fertility rate. In the Seoul metropolitan area (SMA), thesteady-state of regional economic factors increased due to the human capitalaccumulation through technical vocational education of general school. On the otherhand, the steady-state of regional economic factors in non-capital area (ROW) alsoincreased due to the human capital accumulation of general and technical vocationaleducation. In addition, changes in human capital due to general vocational educationhave increased the steady-state of regional economic factors by population inflow,increase of the number of marriages, and gross domestic product per capita, but hasbeen reduced by prices in both SMA and ROW. On the other hand, changes in humancapital due to technical vocational education have led to an higher increase in thesteady-state of regional economic factors due to an increase in population inflows,GRDP per capita, and marriages except price change in ROW.