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손병성,함은일,조아라,안재현,성보미,김윤희,전봉현 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
Our group have fabricated novel metal-introduced and thiol-modified silica-coated magnetic beads (TM-bead) and report UV-Vis spectroscopy as one of their optical properties. A total of six different types of Ag or Ag with Au introduced TM-bead were prepared, that is, firstly, Ag was introduced onto TM-bead either by immobilizing pre-synthesized Ag nanoparticles onto TM-bead or by growing Ag onto TM-bead. Subsequently, Au ions were introduced onto TM-bead@Ag NPs and TM-bead@AgG by growing. Similarly, Au NPs were immobilized onto TM-bead@Ag NPs and TM-bead@AgG. The materials were analyzed by an UV-Vis spectroscopy, a scanning electron microscope and an energy-dispersive X-ray spectroscopy. Obtained under a unified frame, the results provide reliable and valid information against those types of novel metal-based materials. The novel metal-immobilized magnetic beads also can be useful as plasmonic tunable magnetic beads in biological, material, and chemical applications.
신휘범,손병성 慶尙大學校 工科大學 自動化및컴퓨터應用技術硏究所 1999 自動化 및 컴퓨터應用技術 Vol.6 No.1
The windup phenomenon appears and results in performance degradation such as large overshoot, slow settling time when the integral-proportional (IP) controller output is saturated. An anti-windup IP controller is proposed to improve the control performance for the motor drives. The proposed algorithm is applied to the current control of a vector-controlled induction motor driven by a pulse width modulated(PWM) voltage-source inverter. The integral state is separately controlled corresponding to whether the IP controller output is saturated of not. The experimental results show that the current response has much improved performance such is little overshoot and fast settling time.
노인의 사회적 배제 결정요인 분석: 다중적 배제의 잠재집단 유형화를 중심으로
최재성,김혜진 연세대학교 사회복지연구소 2019 한국사회복지조사연구 Vol.63 No.-
This study is based on the assumption that there are various types of social exclusion in older adults. The purpose of the study is to identify subgroups of social exclusion in older adults, and examine the characteristics of each group. We expect this study to provide suggestions to overcome social exclusion and achieve social inclusion. The data were gathered from the “2017 National Profile Survey of Older Adults,” which was conducted by the Korea Institute for Health and Social Affairs. Respondents were 65 years or older (N=10,070) and latent class analysis was applied to identify the optimal subgroups by using Social Exclusion Indicators that comprised six domains (income, consumption, social activities, social relationship, health, and housing status). We also performed multinomial logistic regression analysis and the result identified five different subgroups of social exclusion: non-exclusion (46%); consumption exclusion (16.3%); health exclusion (17.0%); health, social activities, and social relationship exclusion (7.5%); and high-risk multiple exclusion (13.2%). Of all the respondents, 20.7% appeared to belong to multiple social exclusion groups under two or more domains. Findings also showed that the social demographic factors, health factors, socio-economic factors, and community factors affect the subgroups differently. Meanwhile, education and logged annual household income level were significant predicting factors associated with each subgroup. This provided us with new implications in terms of practice and policy. 본 연구는 노인의 사회적 배제 상태가 다양한 모습을 가질 수 있다는 전제에서 출발한다. 연구목적은 노인의 사회적 배제 하위 집단의 유형분류 및 각 집단 유형의 특성을 파악하고 나아가 영향요인을 규명함으로써 ‘사회적 배제’(social exclusion)를 극복하고 ‘사회적 포용’(social inclusion)으로 연결하기 위한 정책함의를 도출하는 것이다. 분석방법으로는 잠재계층 분석(Latent Class Analysis)을 사용하였다. 분석자료는 한국보건사회연구원에서 조사한 ‘2017년 노인실태조사’이며, 만 65세 이상 노인 10,070명의 자료가 최종분석에 사용되었다. 사회적 배제 지표는 다차원성을 고려하여 소득, 소비, 사회적 활동, 사회적 관계, 건강, 주거 등 6차원으로 구성되어 측정되었다. 각 사회적 배제 유형별 특성과 사회적 배제 유형에 미치는 영향요인을 규명하기 위해 다항 로지스틱 회귀분석을 사용하였다. 분석결과, 노인의 사회적 배제는 비배제형(46.0%), 소비배제형(16.3%), 건강배제형(17.0%), 건강⋅교류제한형(7.5%), 고위험다중배제형(13.2%)의 5개 유형으로 나타났고, 응답노인 중 20.7%의 노인은 동시에 두 개 이상의 차원에서 중복적으로 사회적 배제 상태를 보이는 다중배제형에 속하는 것으로 나타났다. 인구사회학적 특성, 사회경제적 특성, 건강 특성, 사회적 관계특성, 지역사회 특성 등에 따라 유형간 차이를 보였으며, 교육수준, 로그연가구소득이 사회적 배제 유형에 대한 공통된 주요 예측 요인으로 확인되었고, 성별, 연령, 건강변인, 사회적 관계 만족도 변인, 거주지는 특정 사회적 배제 유형에서만 유의한 예측요인으로 확인되었다. 연구 결과를 토대로 노인의 사회적 배제 문제를 해결하기 위한 실천적⋅정책적 개입 방안에 대해 논의하였다.
Ag and Ag─Au Introduced Silica-coated Magnetic Beads
김태한,Xuan-Hung Pham,노원엽,김현모,함은일,하유나,손병성,이상훈,전봉현 대한화학회 2018 Bulletin of the Korean Chemical Society Vol.39 No.2
We have developed novel metal-introduced and thiol-modified silica-coated magnetic beads (TM-bead) and report their optical property. A total of six different types of Ag or Ag with Au introduced TM-bead were prepared as follows: Ag was introduced onto TM-bead either by immobilizing pre-synthesized Ag nanoparticles (NPs) onto TM-bead (TM-bead@Ag NPs) or by growing Ag onto TM-bead (TM-bead@AgG). Subsequently, Au ions were introduced onto TM-bead@Ag NPs (TM-bead@Ag NPs@AuG) and TM-bead@AgG (TM-bead@AgG@AuG). Similarly, Au NPs were immobilized onto TM-bead@Ag NPs (TM-bead@Ag NPs&Au NPs) and TM-bead@AgG (TM-bead@AgG&Au NPs). The materials were analyzed by an UV–Vis spectroscopy, a scanning electron microscope and an energy-dispersive X-ray spectroscopy. Obtained under a unified frame, the results provide reliable and valid information against those types of metal based materials. The novel metal-immobilized magnetic beads can also function as plasmonic tunable magnetic beads in biological, material, and chemical applications.