Rheological Characterization of the Gelation Behavior of PVA Solutions in DMSO Containing BA

이은정,김동준,채동욱,김병철,Lee, Eun Jeoung,Kim, Dong Jun,Chae, Dong Wook,Kim, Byoung Chul The Korean Fiber Society 2018 한국섬유공학회지 Vol.55 No.3

The gelation behavior of poly(vinyl alcohol) (PVA) solutions in dimethyl sulfoxide (DMSO) containing boric acid (BA, $H_3BO_3$) under shear stress was rheologically investigated in terms of temperature and molecular weight of PVA. Time-dependent rheological properties of the solutions were analyzed to determine the effects of stress on the gelation mechanism. The solutions of low weight-average molecular weight ($M_w=31,000-50,000$) PVA showed more noticeable temperature-dependent viscosity changes than those of high weight-average molecular weight ($M_w=165,000-186,000$) PVA. The viscosity increase caused by stress indicated that the formation of the gel structure was promoted by stress. In time sweep experiments, all the PVA solutions showed stress-dependent rheological responses except for the high $M_w$ PVA solutions at $30^{\circ}C$. The viscosities of the solutions remained constant over the observed shearing time, indicating the formation of an irreversible gel. The effects of stress history were reconfirmed by the results of frequency sweep experiments. Antecedent shearing gave rise to many different time-dependent rheological responses. At $60^{\circ}C$, both low and high $M_w$ PVA solutions had loss tangent values (tan ${\delta}$) less than 1. Furthermore, the formation of gel structures increased the relaxation time (${\lambda}$) by up to 10 s.

휘트니스클럽 관계마케팅 실행요인과 관계품질 및 충성도와의 관계

이은정(Lee, Eun-Jung),이정학(Lee, Jeoung-Hak) 한국체육과학회 2011 한국체육과학회지 Vol.20 No.6

The purpose of this study was to provide a differentiated marketing strategy for effective sports center management to satisfy the customers by looking through the relationship between fitness club relationship marketing implementation factors, relationship Quality (reliability, satisfaction) and loyalty. The Questionnaires were collected from fitness club customers, training in 20 sport centers located in Seoul, Gyeonggi area by using convenient sampling method. Total of 468 questionnaires were used as final sample and for data analysis, SPSS Ver. 12.0 was used. The result showed ‘professionalism’, ‘attractancy’, ‘long-term customer oriented’ sub-factors of fitness club relationship marketing had significant influence on relationship quality and loyalty. Based on the result, the outcome of CRM of sport center trainer’s relationship marketing can be differ according to the characteristics and managing skill of fitnessclub. Therefore, construction of relationship marketing system which can check the effective implementation of relationship marketing is certainly needed.

스포츠센터 퍼스널트레이너 관계마케팅 실행요인이 관계품질 및 충성도에 미치는 영향

이은정(Lee, Eun-Jung),이정학(Lee, Jeoung Hak),김종훈(Kim, Jong-Hoon) 한국스포츠산업경영학회 2011 한국스포츠산업경영학회지 Vol.16 No.5

본 연구는 스포츠센터 퍼스널트레이너 관계마케팅 실행요인과 관계품질(신뢰, 만족), 충성도 관계 규명을 통해 스포츠센터 운영에 대한 합리적이고 효율적인 운영방안과 스포츠센터 이용고객 욕구와 가치관에 대응할 수 있는 차별화된 마케팅전략을 수립을 위한 실증적 기초자료를 제공하고자 한다. 본 연구는 서울·경기지역 28개 스포츠센터를 표본으로 선정하여 스포츠센터에서 퍼스널트레이너에게 트레이닝을 받고 있는 이용고객을 모집단으로 편의표본추출법을 통하여 설문조사를 실시하였으며, 총 513부를 최종 유효표본으로 선정하였다. 자료처리 분석은 SPSS Ver.12.0을 이용하였다. 연구결과는 다음과 같다. 첫째, 퍼스 널트레이너 관계마케팅 관계품질 하위요인 중 신뢰에 ‘장기고객지향성’, ‘커뮤니케이션’, ‘전문성’, ‘유인성’ 항목이 통계적으로 유의한 영향을 미치는 것으로 나타났다. 둘째, 만족, 충성도에 ‘장기고객지향성’, ‘커뮤니케이션’, ‘전문성’ 모든 항목이 통계적으로 유의한 영향을 미치는 것으로 나타났다. 이상의 연구결과를 토대로 스포츠센터 퍼스널트레이너 관계마케팅은 퍼스널트레이너 자체의 특성 및 경영상의 운영능력에 따라 고객관계관리(CRM)에 대한 성과가 달라질 수 있기 때문에 관계마케팅을 효과적으로 이행되고 있는지를 확인할 수 있는 각별한 퍼스널트레이너 관계마케팅 시스템 구축이 필히 요구 된다 하겠다. The purpose of this study was to provide a differentiated marketing strategy for effective sports center management to satisfy the customers by looking through the relationship between relationship between sports center trainer"s relationship marketing implementation factors, relationship quality and loyalty. The questionnaires were given out to people who were actually receiving personal training in 28 sport center located in Seoul, Gyeonggi area by using convenient sampling method. Total of 513 questionnaires were selected as final validity sample. For data analysis, SPSS Ver.12.o was used and the results are as follow. First, "long-term oriented customer", "communication", "professionalism", "flexibility" influenced significantly on the relationship between personal trainer"s relationship implement factor and reliability. Second, "long-term oriented customer", "communication", "professionalism" influenced significantly on the relationship between satisfaction and loyalty. Based on the result, the outcome of CRM of sport center trainer"s relationship marketing can be differ according to the characteristics and managing skill of personal trainer. Therefore, construction of personal trainer"s relationship marketing system, which can check the effective implementation of relationship marketing is certainly needed.

PVA/DMSO 용액계의 유변학적 특성에 미치는 PVA의 분자량분포의 영향

이은정(Eun Jeoung Lee),김병철(Byoung Chul Kim) 한국고분자학회 2007 폴리머 Vol.31 No.6

藥用植物(열매)에서 訪花昆蟲의 活動과 花粉媒介 效果

李炯來(Lee Hyung-Rae),李京淳(Lee Kyong-Soon),李恩靜(Lee Eun-Jeoung),崔相基(Choi Sang-ki) 한국양봉학회 1995 韓國養蜂學會誌 Vol.10 No.2

고추, 들깨, 참깨에서 訪花昆蟲의 活動과 花粉媒介 效果

李炯來(Lee Hyung-Rae),金正和(Kim Jeong-Wha),李恩靜(Lee Eun-Jeoung),李成玉(Lee Seong-Ok) 한국양봉학회 1995 韓國養蜂學會誌 Vol.10 No.2

스포츠전문채널의 프로야구 하이라이트 프로그램 여성 아나운서 이미지가 시청만족, 채널평판 및 시청의도에 미치는 영향

이정학(Lee, Jeoung-Hak),전윤기(Chun, Yoon-Ki),이은정(Lee, Eun-Jung),서준영(Seo, Jun-Young) 한국체육과학회 2019 한국체육과학회지 Vol.28 No.5

The purpose of this study is to examine the effects of Sports Channels’ KBO League highlight TV program female announcer’s image on satisfaction, perceived channel reputation, and viewing intention of the viewers and to provide basic data for future reference regarding related programs. In this study, 317 samples were collected f rom actual highlight program v iewers. With the collected data, using SPSS 21.0 statistic tool, frequency analysis, exploratory factor analysis, reliability analysis, correlation analysis, and multi-regression analysis were performed and got the following results. First, female announcer’s style, credibility, and humanity image factors had significant influence on viewer’s satisfaction. Second, female announcer’s humanity, delivery, and professional image factors had significant influence on channel reputation. Finally, female announcer’s style, humanity, and credibility image factors had significant influence on viewing intention.

빅데이터 분석을 활용한 배드민턴 브랜드 인식에 관한 연구

이정학(Lee, Jeoung-Hak),이재문(Lee, Jae-Moon),이은정(Lee, Eun-Jung) 한국체육과학회 2017 한국체육과학회지 Vol.26 No.3

This study examines the national awareness of badminton brand utilizing Big Data Analysis. For this purpose, blogs, cafes, intellectuals(tips), news, and web documents provided by Naver and Daum were selected as analysis channels, and keywords for searching big data are ‘badminton brand’ were extracted as main words. Data analysis period was limited to 2 years from january 1, 2015 to december 31, 2016. For data collection and analysis, frequency and metrics data were extracted through Textom, Social Metrics program, and the degree of the relationship was quantified by analyzing the connection structure and connection degree centrality between words using Ucinet6. For visualization, NetDraw function of Ucinet6 was used to visualize the network between words related to keyword. In addition, CONCOR analysis was conducted to derive clusters formed by words having similarity. The results of analysis are as follows: First, as a result of analyzing the key words through the upper words using badminton brand as a keyword, Badminton, Brand, Racket, Yonex, Supplies appeared among the top 5. Second, the median of connectivity values showed that it was high in Badminton, Brand, Racket, Yonex, Supplies appeared among the top 5. Third, as a result of conducting N-GRAM network graph using Badminton Brand as a keyword, Badminton/Racket, Badminton/Brand, Lio Olympic/Lio Olympic, Brand/Yonex, Racket/recommendation appeared among the top 5. Fourth, As a result of CONCOR analysis, groups of ‘badminton’, ‘brand’, ‘marketing’, ‘supplies’, ‘purchasing factor’, ‘item’ were formed.

골프클럽 브랜드 개성과 브랜드 동일시, 만족도, 충성의도와의 구조적 관계

이정학(Jeoung Hak Lee),이지혜(Ji Hae Lee),이은정(Eun Jung Lee) 한국사회체육학회 2012 한국사회체육학회지 Vol.0 No.50

The purpose of this study was to evaluate the casual relationship between golf club brand identification, brand equity, brand satisfaction and loyalty intention and provide basic data for come up with marketing strategy targeting toward golf club consumers. A survey was given out to people who was practicing golf in 7 different ranges, locate in Seoul and Gyeonggi area. Total of 380 questionnaires were given out by using convenient sampling method and 320 questionnaires were used as final validity sample. For data analysis, SPSS 12.0 and Amos 18.0 were used for frequency analysis, exploratory factor analysis, reliability analysis, correlation analysis, confirmatory analysis and structural equating model and the results are as follow: First, all of the sub-factors of brand identification, ``ruggedness``, ``excitement``, ``sincerity``, ``competence``, ``sophistication`` influenced positively on brand equity. Second, brand equity influenced positively on brand satisfaction and loyalty intention. Third, brand satisfaction positively influenced on brand loyalty intention.

Rheological Properties of PAN/DMF Spinning Solutions and Physical Properties of Conducting Carbon Nanofibers Prepared by Electrospinning and Carbonization

채동욱,권오주,이은정,김병철,Chae, Dong Wook,Kwon, Oh Joo,Lee, Eun Jeoung,Kim, Byoung Chul The Korean Fiber Society 2016 한국섬유공학회지 Vol.53 No.5

Dynamic rheological properties of polyacrylonitrile (PAN)/dimethylformamide (DMF) solutions were measured at several different temperatures ($25-55^{\circ}C$), and their electrospinning was conducted at corresponding temperatures to prepare PAN precursor fibers. The electrospun fibers were subsequently converted to carbon nanofibers through a carbonization process and their physical properties such as electrical conductivity, morphology and crystal structure were examined with regard to the electrospinning temperature. The dynamic viscosity of PAN/DMF solutions decreased with increasing temperature, exhibiting a lower Newtonian flow region followed by shear thinning. In the Cole-Cole plot, the initial slope decreased with decreasing temperature but a single master curve of constant slope above the inflection point was observed regardless of the temperature. FESEM images showed that the diameter of the PAN precursor fibers and resulting carbon nanofibers decreased as the electrospinning temperature increased. The diffraction peak of carbon nanofiber in the WAXD pattern was shifted from 22 to $24^{\circ}$. Further, Raman spectroscopy showed that the graphitic carbon peak at $1600cm^{-1}$ increased with increasing electrospinning temperature. In addition, the electrical conductivity of the carbon nanofiber increased considerably from 2.95 to 6.15 S/cm with increasing electrospinning temperature from 25 to $55^{\circ}C$.