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검색결과 2,362건 처리시간 0.029초

The Effect of Transverse Magnetic field on Macrosegregation in vertical Bridgman Crystal Growth of Te doped InSb

  • Lee, Geun-Hee;Lee, Zin-Hyoung
    • 한국결정성장학회:학술대회논문집
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    • 한국결정성장학회 1996년도 The 9th KACG Technical Annual Meeting and the 3rd Korea-Japan EMGS (Electronic Materials Growth Symposium)
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    • pp.522-522
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    • 1996
  • An investigation of the effects of transverse magnetic field and Peltier effect on melt convection and macrosegregation in vertical Bridgman crystal grosth of Te doped InSb was been carried out by means of microstructure observation, Hall measurement, electrical resistivity measurement and X-ray analysis. Before the experiments, Interface stability, convective instability and suppression of convection by magnetic field were calculated theoretically. After doping 1018, 1019 cm-3 Te in InSb, the temperature of Bridgman furnace was set up at $650^{\circ}C$. The samples were grown in I.D. 11mm, 100mm high quartz tube. The velocity of growth was about 2${\mu}{\textrm}{m}$/sec. In order to obtain the suppression of convection by magnetic field in the middle of growth, 2-4KG magnetic field was set on the melt. For searching of the shape of solid-liquid interface and the actual velocity of crystal growth, let 2A current flow from solid to liquid for 1second every 50seconds repeatedly (Peltier effect). The grown InSb was polycrystal, and each grain was very sharp. There was no much difference between the sample with and without magnetic field at a point of view of microstructure. For the sample with Peltier effect, the Peltier marks(striation) were observed regularly as expected. Through these marks, it was found that the solid-liquid interface was flat and the actual growth velocity was about 1-2${\mu}{\textrm}{m}$/sec. On the ground of theoretical calculation, there is thermosolutal convection in the Te doped InSb melt without magnetic field in this growth condition. and if there is more than 1KG magnetic field, the convection is suppressed. Through this experiments, the effective distribution coefficients, koff, were 0.35 in the case of no magnetic field, and 0.45 when the magnetic field is 2KG, 0.7 at 4KG. It was found that the more magnetic field was applied, the more convection was suppressed. But there was some difference between the theoretical calculation and the experiment, the cause of the difference was thought due to the use of some approximated values in theoretical calculation. In addition to these results, the sample with Peltier effect showed unexpected result about the Te distribution in InSb. It looked like no convection and no macrosegregation. It was thought that the unexpected behavior was due to Peltier mark. that is, when the strong current flew the growing sample, the mark was formed by catching Te. As a result of the phenomena, the more Te containing thin layer was made. The layer ruled the Hall measurement. The values of resistivity and mobility of these samples were just a little than those of other reference. It was thought that the reason of this result was that these samples were due to polycrystal, that is, grain boundaries had an influence on this result.

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점혈기공요법(點穴氣功療法)을 통해 본 수기요법(手氣療法)의 문헌적(文獻的) 연구(硏究) (Observed through the stories of herbal remedies Jeom-hyeol-gigong, philological research of Su-gi therapy)

  • 김인창;서윤희
    • 대한의료기공학회지
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    • 제11권1호
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    • pp.236-261
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    • 2009
  • 'Jeom-hyeol-gigong(點穴氣功)' gives a drill, Gi(氣) as a place to jam. This pathogen(邪氣) is removed. Given the low places and supplement it energy to flow up the well is the cure. This is an internal organ and muscular Gi allows a natural flow. Blood, one that moves and guides Gi is Gi I still feel that it makes any blood, making you feel good in life is flowing with vitality. Gi driving our whole body, while supplying vital energy and blood circulation, helping to defend the body is functioning. 'Jeom-hyeol-gigong' principle of Gi where the blockages to flow naturally energy is to let the flow. Aura of the voluntary and proactive action will be to have healthy bodies. Gi as a whole-body blood circulation leading to the cells in each tissue to supply energy and nutrients to every cell as the original principles of free activities that will maximize your life. Gi to prevent the three causes Internal causes: 5 greed and 7 emotions External causes: climate, food, pathogens, stress, etc. The internal nor the external causes: internal and external factors that cause the complex elements, incorrect position of the bone caused by an imbalance Heart disease will be police officers and raise their resistance to disease than the body, what jung-gi(正氣) have to develop. Beneficial to human body's resistance to raise the jung-gi people young-gi(營氣) and wi-gi(衛氣) should be enhanced. If the form is perfectly possible, Gi cycle itself should not have to breathe. Abdominal diagnosis 'bok-su-ap-an-beop(伏手壓按法)', 'sam-ji-tam-an-beop(三指探按法)' hands are like this, which outlined five viscera in order to understand the problem, the lower side of the clavicle (lung), the pit of stomach (Heart), both the lower ribs (liver), navel below (kidney) can be diagnosed at such areas. In each area of the skin, abdominal muscle tension, aching, or pressing a fuss about, beating the ruling of the state and the problem is a clue. And mo-hyeol(募穴) and certain Acupressure group, the chest, back, belly, so that scattered around each' book 'of the problem can be found. This is also the target of such a diagnosis, such as shape, color of skin, muscle Mostly the scope of the pitch in the cervical spine is broad across the hips. sugi(手氣) method that 'an method(按法) and 'ma method(摩法), bak method(拍法) is.

레시피 관련 웹 사이트 중 한국음식 레시피의 자료 분석 및 검토 (Analysis of Recipes for Korean Foods in Web Sites)

  • 윤미옥;문현경
    • 대한영양사협회학술지
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    • 제10권4호
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    • pp.390-400
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    • 2004
  • Food and nutrition sites are the major portion of the health information sites. For the point of public health it is very important to secure validity and reliability of information on those web sites. Therefore, in this study we would like to identify problems when acquiring recipes in web sites by analyzing and reviewing recipes in web sites. To investigate Korean food recipes provided in web sites, domestic search engines such as Simmani, Naver, Hanmir, and Empas and foreign search engines such as Yahoo Korea, Lycos and Altabista Korea were used. Searchs were done using 'recipe' and 'Joribeob (cooking method)' from March 20, 2002 to June 20, 2002. Informations in each sites were reviewed and analyzed Results are as follow; When classifying 46sites searched with 'Joribeob' by the information provider, 24sites were individual, 16sites were corporate and 6sites were others. When searching 'recipe', total 12,654recipes were returned. Out of them, individual provided 2,581sites(20.4%), corporate provided 7,249sites(57.3%), and others provided 2,824sites(22.3%). 9,979(78.9%) recipes out of 12,654recipes were proved to be appropriate as Korean food. Classifying recipes by dish group, vegetables 11.7%, soups and hot soups 9.7%, stew and casseroles 8.2%, pan cakes 8.0%, stir fried foods and skewers 7.8%, rice 7.2%, hard boiled food 7.1%, steam 6.4%, noodles and mandu 5.3%, Kimchi 4.5%, fried 4.1%, and porridge 3.7% in order. 21.1% of recipes were not appropriate as Korean food but provided as Korean Food. The proportion of individual as the information provider were higher than that of enterprises. Recipes from enterprises were based on food and nutrient information and more reliable. However, there were some cases that they provided the same amount of ingredients with different calories or provided the same calories with different ingredients. Additionally, depending on sites, they provided different calories even for the same recipe. There were some cases that the calories provided on the site were too high or too low, for the suggested amount of ingredients and serving size. Recipes those provide amount of calories were evaluated using the nutrient analysis program. Calculated calories and provided calories on the Web were compared together. There are difference between two valus. With these results, it may lead misuse of recipe by those who need accuracy in diet such as patients or who are interested in recipe information for academic purposes. These results could be used as basic materials to improve quantity and quality of recipes in the future. Also, to improve the accuracy of recipies for Korean foods in the web sites, there should be some systems to monitor and let internet users know monitoring results.

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비형식적 활동을 통한 증명교육이 초등 영재학급 학생들의 증명 능력에 미치는 영향 (Effect of Proof Education through Informal Activities on the Proof abilities of Students in the Elementary Gifted Class)

  • 고준석;송상헌
    • 대한수학교육학회지:학교수학
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    • 제13권3호
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    • pp.501-524
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    • 2011
  • 본 연구는 초등 영재학급 학생들의 증명 능력 향상을 목적으로 증명의 본질과 구조를 경험할 수 있는 비형식적 활동 교수 학습 자료를 개발하고 이를 실제 현장에 적용한 사례들을 분석하여 초등학교 수준에서의 영재들을 위한 증명 교육의 가능성과 교육에서의 시사점을 제안하기 위한 것이다. 초등 영재학급 학생들은 비형식적 활동 교수 학습 자료를 통해 증명의 본질과 구조에 대한 기본적인 이해가 이루어졌으며 증명에 대한 중요성과 필요성을 인식하였다. 증명에 대한 흥미도도 높아졌지만 증명이 쉽다고 느끼지는 않았다. 학생들은 광고나 신문, 패러독스에서 가정을 분석할 수 있었으며, 자료 적용 후에는 어려운 증명 문제에 도전하고자 하는 의지를 보였다. 이를 바탕으로 영재학급 학생들을 대상으로 하는 증명교육의 시사점을 제안하였다.

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초등학교 치아우식 아동의 구강검진 후 관리 실태와 어머니의 구강건강신념과의 관계 (Post-examination Management State of Dental Caries in Elementary School Students in Conjunction with a Mother's Dental Health Beliefs)

  • 배진순;장성실
    • 한국학교보건학회지
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    • 제12권2호
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    • pp.305-319
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    • 1999
  • The objective of this study were to evaluate the relation between post-examination management states of dental caries in elementary school students and a mother's dental health beliefs. We systematically chose 10 elementary school in urban and rural areas of Chungnam Province and determined the first class students of 5 and 6 grade in each school as study subjects. Among 837 participants, 669 students were diagnosed with dental caries after a 1998 periodic dental health examination was answered completely and analysed. The contents of the questionnaire for students were general characteristics, dental health behaviors, notification factors, treatment factors. Their mothers were surveyed by another questionnaire. The contents of the questionnaire for mothers were also general characteristics, dental health behaviors, and dental health beliefs. The result of this study were as follows 1. The prevalence of dental caries was 65.0% and there was no significant difference between urban and rural areas. 2. Meanwhile, 63.8% of students in urban areas knew the examination result through a doctor's explanation, 52.4% of students in rural areas learned through a school notification letter, 82.9% of all the students let their parents know of their dental caries. 3. Among the dental caries group, 36.3% of the students were treated as for treatment, most students in urban areas visited a dental clinic, but those in rural areas visited the dental dept of a public health center as for the treatment time, 35.9% of the students were treated immediately after the examination. 4. 44.9% of those treated answered that they felt they needed treatment; 67.2% of those not treated answered that they considered the treatment as a bother and unnecessary due to no pain. 5. Overall, the scores in the dental health beliefs in mothers were low. Especially among the 5 items of susceptibility and seriousness, the scored were very low but the benefit was high. Logistic regression analysis showed that the treatment of a child's dental caries was significantly associated with low scores of benefit in those untreated and high scores among those treated. Considering these results, health education to stimalate a mother's susceptibility and seriousness in health beliefs and for students to learn the need for treatment, including a more detailed post exam management system at the school level should be considered for a higher treatment rate.

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자연탐사활동이 과학고 학생들의 환경인식에 미치는 효과 (The Effect of Natural Exploration Activity on Environmental Perception of the Science High School Students)

  • 김순식;최성봉
    • 한국환경과학회지
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    • 제19권3호
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    • pp.343-351
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    • 2010
  • Since the effect of environmental education at class using textbooks or materials related to environment is limited, the importance of activities for field experience is getting increased day by day. Thereby, the education tends to change into the type of education providing students with direct environmental experience. Students attending the science high school have excellent aptitude and ability for science and will lead the development of science in the future. Now it is urgent to develop various experiential programs which are helpful for them to establish desirable values on environment. However, the field of environmental education that allows science high school students equipped with ample environmental knowledge to improve environment sensitivity and have proper environment awareness is quite restricted as of now. Natural exploration activities are the programs which provide science high school students having lack of chance for environmental education with good opportunities to contact nature and also play significant roles in arousing their interest in issues related with environment. Therefore, it is thought that they will let science high school students explore the natural features of Korea, understand the importance of preserving environment and ecosystem profoundly, and encourage environmental awareness and will of environmental practice. Thereupon, with the study subjects of 121 first and second graders at U Science High School, this article analyzed their recognition of the necessity for environmental education and environmental pollution problems before and after the natural exploration activities, and conducted a survey on their satisfaction after the natural exploration activities and analyzed it. The result of this research is as follows. First, it was shown that the natural exploration activities were effective to raise the science high school students' awareness of issues related with environmental pollution. Second, the natural exploration activities had effect upon enhancing the students' willingness of environmental practice. Third, there was statistically significant correlation between the science high school students' satisfaction with the natural exploration activities and their achievement in the science subject. Fourth, there also was a statistically non or weakness significant correlation between their satisfaction with the natural exploration activities and preference for the science subject. In particular, it was found that students preferring biology indicated higher satisfaction.

사회과 수행평가 효율화를 위한 웹 기반 보고서 시스템 개발 및 적용 (Development and Application of Web-Based Report System for the efficiency of Social Studies Performance Evaluation)

  • 양정순;고병오
    • 정보교육학회논문지
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    • 제12권1호
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    • pp.33-40
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    • 2008
  • 사회과에서는 학생들이 주제를 정해 스스로 계획을 세워 조사하고, 사회를 탐구해가며 조사 보고서를 정리해가는 능력을 중요시 여겨왔으며, 교육 현장에서 가장 많이 사용되는 사회과 수행평가 방법도 조사 보고서 방법이다. 하지만 대부분의 학습자들은 '보고서를 작성해오라'는 지시를 받고, 뚜렷한 목표나 체계적인 형식 없이 보고서를 작성하고, 교사에게 제출한 후 학기말 평가 결과만을 일방향적으로 통보 받아왔다. 현 수행평가는 본질적인 의미에서 벗어나 단순히 결과만을 중시하던 기존의 평가를 유지하고 있는 것이다. 이에 본 연구는 수업의 한 과정으로서 평가가 이루어질 수 있는 웹 기반 수행평가 시스템을 설계 및 구현하였다. 본 연구는 시스템을 기반으로 학생들이 다양한 자료를 탐색, 수집하여 일정한 형식에 보고서를 작성하고, 제시된 평가 관점에 의하여 동료평가를 한 후 평가 결과를 즉시 피드백하여 학습자간, 교사와 학습자간의 상호작용을 활성화시켜 학습 의욕을 고취시키고 평가의 질 향상을 목적으로 하였다.

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경관평가를 위한 곡면스크린 방식의 몰입형 시뮬레이션 시스템 (Curved Screen Display Immersion Simulation System for Landscape Evaluation)

  • 장종현;김충식;이인성
    • 한국조경학회지
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    • 제37권3호
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    • pp.61-68
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    • 2009
  • 3차원 몰입형 시뮬레이션이나 입체영상 기술이 개발되면서 경관을 표현하는 도구로 사용이 확산되고 있다. 이에 본 연구는 가시환경과 투사방식의 차이에 따른 경관선호도 분석을 실시하여 가로경관 평가도구로써 곡면 스크린 방식의 몰입형 입체영상의 활용 가능성을 검토하였다. 연구를 위해 서울의 50m 폭원 강남대로를 선정하여 컴퓨터그래픽으로 시뮬레이션을 제작하였다. 시뮬레이션은 가시 환경과 투사방식을 달리하여 경관선호도를 설문조사하였다. 시뮬레이션의 가시환경은 몰입과 비몰입, 투사방식은 입체와 평면영상으로 구분하였다. 요인분석과 t-test 등의 통계분석을 거쳐 가시환경과 투사방식의 차이에 따른 경관특성을 비교하였다. 연구결과는 다음과 같다. 첫째, 몰입이나 비몰입 환경에 따라 경관특성의 차이가 뚜렷하게 나타났다. 몰입형의 시뮬레이션을 이용하면 관찰자가 다양성 요인, 개방성 요인, 공간감 요인에 대해 평가하기가 비교적 용이하여 변별력이 높은 것으로 나타났다. 둘째, 입체나 평면의 투사방식은 변별력을 보이고 있지 않는 것으로 나타났다. 이러한 결과는 경관평가를 위한 시뮬레이션의 제작 및 투사에 있어서 관찰자가 몰입을 할 수 있는 시야각까지 화면을 확장하여 몰입감을 높이는 것이 중요하다는 것을 시사한다. 본 연구는 경관평가 도구로써의 몰입형 시뮬레이션의 효용성을 검토하기 위한 연구로 가로경관의 많은 요소들을 통제하게 됨으로써 변별력을 크게 갖지 못했다는 한계가 있다. 추후 가로폭원, 가로폭원 : 건물높이비 등 다양한 환경에 대해 입체영상에 대한 세밀한 비교 검증이 필요할 것으로 보인다.

농촌지역 환경갈등과 농촌주민 환경운동의 역할과 의미 : 양평군 팔당지역 유기농업운동을 사례로 (The Roles and Meanings of Environmental Conflict and Movement in Rural Region : A Case Study on Organic Farming Movement at Paldang Region, Yangpyung-gun)

  • 이영민;허남혁
    • 한국지역지리학회지
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    • 제7권4호
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    • pp.18-32
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    • 2001
  • 최근 우리 사회에서 빈번하게 목격되는 환경이념과 개발이념 간의 갈등은 대체로 지역의 문제로써 표출되는데, 팔당 상수원 보호구역의 경우도 마찬가지이다. 자연자원의 개발을 통해 지역발전을 도모하고자 하는 지역주민들과 수도권 전체의 공익을 위한 맑은 물 확보 차원의 정부의 노력이 상충되고 있는 현장인 것이다. 더욱이 환경보호가 핵심키워드로 인식되고 있는 작금의 상황은 중앙의 환경단체들이 정부 편에 서서 지배담론을 강화시켜 줌으로써 생존권 화보를 위한 지역주민들의 저항담론을 약화시키고 있고, 따라서 극한 대립의 상황에까지 이르게 하였다. 이러한 갈등의 구도 속에서 매우 인상적인 중재적 역할을 수행하고 있는 것이 바로 유기농업운동이다. 이는 정부와 지역의 첨예한 대림을 완화시키고, 소위 윈-윈(win-win) 전략의 수립이 가능한 방향으로 지역주민들을 설득해가고 있다. 이는 또한 "지속가능한 발전", 혹은 "지탱가능성" 이념을 충족시킬 수 있는 하나의 대안으로써 이 지역에서 뿌리를 내려가고 있다. 환경규제에 맞서서 싸우고 있는 지역에서 오히려 혁명적인 친환경적 지역발전 정책들이 추진되고 있다는 본 지역에서의 상황이 다소는 역설적으로 들릴 수 있으나, 이는 우리나라의 농촌지역에서 앞으로도 계속 겪게 될 환경보존과 지역발전의 대립 구도 해결에 있어서 매우 중요한 방향타가 될 수 있을 것이다.

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기업의 사회적 책임 활동 과정에서의 고객참여가 고객 반응에 미치는 영향 (The Effects of Customer Participation in CSR(Corporate Social Responsibility) Process on Customers' Response)

  • 장정민;이은영
    • 유통과학연구
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    • 제14권3호
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    • pp.45-54
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    • 2016
  • Purpose - There have been numerous studies investigating the effects of corporate social responsibility initiatives on corporate associations or corporate images. In line of this research stream, current research examined the potential impact of customer participation in the process of corporate social responsibility initiatives on attitude toward the company. This research differentiates from previous studies that it is the first to connect corporate social responsibility and customer participation. Specifically, we suggest a structural model on corporate associations which was classified into corporate ability associations and corporate social responsibility associations that the more the customers participate in initiating corporate social responsibility, corporate associations were formed more positively. And this leads to the increase of revisit intentions through customer satisfaction. Research design, data, and methodology - To test our research model, we collected data of real consumers of a large discount store in Korea. At the large discount store, customers were given an opportunity to participate the discount store's CSR activity program. We performed field survey and collected data of 146 respondents. We analyzed the data using PASW statistics 21.0 and AMOS 16.0 in order to test our structural model. Results - The results showed that consumers who participated more in initiating corporate social responsibility revealed higher score for corporate ability associations and corporate social responsibility associations. These corporate associations had a positive effect on customer satisfaction, which leads to higher attitude toward revisit intentions. Specifically, hypothesis 1.1 "As Customer participation in CSR process increases, the evaluation of CA associations will be positive,"was supported. Hypothesis 1.2 "As Customer participation in CSR process increases, the evaluation of CSR associations will be positive," was supported. Hypothesis 2.1 "As the evaluation of CA associations is positive, satisfaction with the firm will increase," was supported. Hypothesis 2.1 "As the evaluation of CSR associations is positive, satisfaction with the firm will increase," was supported. Hypothesis 3 "As satisfaction with the firm increases, revisit intentions with the firm will increase," was supported. Conclusions - This research is the first to study the relationship between customer participation in CSR process, CSR, and consumer reactions. This research also contributes to customer participation and corporate social responsibility literature by suggesting customer participation as an antecedent and empirically demonstrating the positive relationships between the constructs. The findings of this research may offer managerial implications for marketing practitioners. When performing corporate social initiatives, it is better to let the customer participate in the process which leads to higher corporate ability associations and corporate social responsibility associations, also higher satisfaction and revisit intentions. Our results provide useful information to practioners that spontaneous participation of consumers makes CSR initiatives effective and successful. Limitations and ideas for further research remain in this research. For example, our focus on the logic was cognitive evaluations(e.g. corporate associations) but affective dimensions might be considered since recent researches are investigating the relationship between customer participation and affective reaction as a response. Despite the limitations, this research have unique and applicable implications for academics and practitioners.