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Han, Sangsuk,Choi, Junsok,Seo, Youngwook P.,Park, In Jun,Choi, Hyoung Jin,Seo, Yongsok American Chemical Society 2018 Langmuir Vol.34 No.8
<P>The magnetorheological (MR) performance of suspensions based on core–shell-structured foamed polystyrene (PSF)/Fe<SUB>3</SUB>O<SUB>4</SUB> particles was investigated by using a vibrating sample magnetometer and a rotational rheometer. Core–shell-structured polystyrene (PS)/Fe<SUB>3</SUB>O<SUB>4</SUB> was synthesized by using the Pickering-emulsion polymerization method in which Fe<SUB>3</SUB>O<SUB>4</SUB> nanoparticles were added as a solid surfactant. Foaming the PS core in PS/Fe<SUB>3</SUB>O<SUB>4</SUB> particles was carried out by using a supercritical carbon dioxide (scCO<SUB>2</SUB>) fluid. The density was measured by a pycnometer. The densities of PS/Fe<SUB>3</SUB>O<SUB>4</SUB> and PSF/Fe<SUB>3</SUB>O<SUB>4</SUB> particles were significantly lowered from that of the pure Fe<SUB>3</SUB>O<SUB>4</SUB> particle after Pickering-emulsion polymerization and foaming treatment. All tested suspensions displayed similar MR behaviors but different yield strengths. The important parameter that determined the MR performance was not the particle density but rather the surface density of Fe<SUB>3</SUB>O<SUB>4</SUB> on the PS core surface. The morphology was observed by scanning electron microscopy and transmission electron microscopy. Most Fe<SUB>3</SUB>O<SUB>4</SUB> particles stayed on the surface of PS/Fe<SUB>3</SUB>O<SUB>4</SUB> particles, making the surface topology bumpy and rough, which decreased the particle sedimentation velocity. Finally, Turbiscan apparatus was used to examine the sedimentation properties of different particle suspensions. The suspensions of PS/Fe<SUB>3</SUB>O<SUB>4</SUB> and PSF/Fe<SUB>3</SUB>O<SUB>4</SUB> showed remarkably improved stability against sedimentation, much better than the bare Fe<SUB>3</SUB>O<SUB>4</SUB> particle suspension because of the reduced density mismatch between the nanoparticles and the carrier medium as well as the surface topology change.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/langd5/2018/langd5.2018.34.issue-8/acs.langmuir.7b04043/production/images/medium/la-2017-040436_0010.gif'></P>
최종석(JongSuk Choi),이병기(Byoung-gi Lee),윤상석(SangSuk Yoon),최문택(Mun-Taek Choi),김문상(Munsang Kim),김대진(Daijin Kim) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
Service robot is equipped with various sensors such as vision camera, sonar sensor, laser scanner, microphones, and the like. Although these sensors have their own functions, some of them can work together to perform more complicated functions. Audio-vision fusion is a typical and powerful combination of two sensors because audio is complementary to vision and vice versa. Human-beings also mainly depend on visual and auditory information in their daily life. In this paper, we provide two studies using audio-vision fusion. One is about enhancing performance of sound localization. The other is about robot attention with sound localization and face detection.
중소 규모의 치과의원에 균형성과표를 적용하기 위한 핵심성과지표 개발
김상석 ( Sangsuk Kim ),김명기 ( Myeng Ki Kim ),최형길 ( Hyungkil Choi ) 한국병원경영학회 2017 병원경영학회지 Vol.22 No.1
The purpose of this study is to develop the KPIs(Key Performance Indices) needed to improve management and strategy in the dental clinic based on the four perspectives of BSC(Balanced Scorecard). The questionnaire was conducted on 52 dentists approved by Dental Managment Research Committee in Seoul National University as a panel. Using the Delphi technique, the top five KPIs for each point of perspective in BSC were extracted from KPI pools. In the third survey, the top five KPIs of all points were compared with each other through AHP(Analytic Hierarchy Process) method, and priority and overall importance rankings were calculated. The biggest difference in the three level AHP results was the customer perspective took priority to others. In the second survey, the financial perspective, which was number one, was pushed back. The overall significance of KPIs was in the order of customer, internal process, finance, learning and growth perspective, with the exception of medical profits (5th of 20) and new patient growth (10th of 20). We were able to overcome the limitations of the Delphi Technique with the AHP method. In general, the financial perspective in BSC is known to be the most important, but we conclude that the customer perspective is more important through the pairwise comparison survey. In the current dental service market, which is a long-term recession, excessive competition, customer satisfaction and customer relationship management seem to be the first goal to pursue in dental clinic.
최민경 ( Mingyeong Choi ),윤상석 ( Sangsuk Yoon ),오지향 ( Ji-hyang Oh ) 대한의료커뮤니케이션학회 2016 의료커뮤니케이션 Vol.11 No.2
Purpose: This study aims to develop and validate a Korean version of Illness Perception Questionnaire that measures patients` cognitive and emotional representations about their symptoms and diseases. The scale is expected to help patients and clinical staffs to have better communication by enhancing understandings of the patients` cognitive representations to their illnesses. Methods: The authors translated the Illness Perception Questionnaire-Revised (IPQ-R) into Korean and investigated the validity and reliability of the Korean Illness Perception Questionnaire (K-IPQ) on patients with three different illness types: stroke, heart disease, and hypertension. The participants completed the K-IPQ, Fatigue Severity Scale, RAND SF-36, and several demographics-related questions. Results: A Confirmatory factor analysis revealed that the K-IPQ had the same factor structure with the IPQ-R except for five items. Considering cultural and linguistic characteristics in Korean, the authors suggested the final version of the K-IPQ that consists of a total of 12 sub-constructs with33 questions. Discriminant validity tests showed that the cognitive representation subscale of the K-IPQ was distinctive from the scales for patients`emotional status (e.g., PANAS). A predictive validity test revealed that six sub-constructs of the K-IPQ (identity, personal control, treatment control, consequences, timeline-acute/chronic, timeline-cyclical, and illness coherence)significantly predicted health adaptation (general health, fatigue, and emotional distress). Conclusions: The findings indicate that the K-IPQ is avalid and reliable scale for measuring Korean patients` illness perception. Future research is required to investigate the underlying psychological processes in the relationships between the sub-constructs of the K-IPQ and illness perception in different illness groups.ove nurse`s job engagement.
개별적 저 나트륨 투석 액 적용이 말기 신부전증 환자의 혈압, 투석 간 체중 증가, 갈증 및 투석 중 불편감에 미치는 영향
김상숙(Kim Sangsuk),최영실(Choi Youngsil) 한국기초간호학회 2019 Journal of korean biological nursing science Vol.21 No.3
Purpose: The purpose of this paper was to identify blood pressure, interdialytic weight gain, thirst and intradialytic discomfort in subjects after applying individual low-sodium dialysis fluid (1,2,3 mEq/L) to hemodialysis patients for 12 weeks. Methods: This study was a non-equivalent pre-post design. For 12 weeks, dialysate concentration was maintained at 1 mEq/L or 2 mEq/L or 3 mEq/L based on average sodium concentration of each individual, and the difference was compared after applying individually. Results: Change in blood pressure significantly decreased in the group where in pre-hemodialysis systolic pressure decreased the gradient of sodium concentration in serum sodium and dialysis solution by 2mEq/L. Interdialytic weight gain, and thirst showed significant decrease in all three groups. But in all three groups, intradialytic discomfort among dialysis showed no significant changes. Conclusion: Although application of low sodium dialysis fluid showed no change in intradialytic discomfort, lowered blood pressure, thirst, and interdialytic weight gain, which could be used for individual showing increased interdialytic weight gain and increased blood pressure. There is need for continued study on this.
맞춤형 식이교육이 자가 간호이행, 자기효능감 및 생리적 지표에 미치는 효과: 역할불이행 혈액투석 환자를 중심으로
김상숙(Kim, Sangsuk),최영실(Choi, Youngsil) 한국재활간호학회 2021 재활간호학회지 Vol.24 No.1
Purpose: The purpose of this study to identify the effects of tailored dietary education on self-care compliance, self-efficacy and physiologic indicators in noncompliant hemodialysis patients. Methods: This study utilized one-group repeated pretest-posttest design. Forty-four hemodialysis patients were recruited from C hospital, Gyeonggi-Do. Data were collected at four and twelve weeks after education from February to August, 2019. Data were analyzed using the SPSS version 20.0 program with descriptive statistics, repeated measure-ANOVA and Bonferroni’s method. Results: There were significant increases in diet knowledge (F=7.37, p=.003), diet self-care compliance (F=12.53, p=.001) and self-efficacy (F=14.00, p=.001) even 12 weeks after tailored dietary education. The serum phosphate levels were significantly lowered at four weeks after education (F=7.30, p=.003). Conclusion: The findings in this study suggest that tailored dietary education was effective to improve self-care compliance, self-efficacy and physiologic parameters in noncompliant hemodialysis patients. Prior to education, information including cognitive function, dietary habits, and examples of dietary life is essential in noncompliant hemodialysis patients. Tailored interventions in various ways should be sought to provide effective education.