다단연소기를 이용한 저 NOx 연소특성 연구

조은성,성용진,정석호,Cho, Eun-Seong,Sung, Yong-Jin,Chung, Suk-Ho 대한기계학회 2003 大韓機械學會論文集B Vol.27 No.1

Staged combustion, such as air- and fuel-staging, is a relatively well-known technique fur reduction of NOx emission and used in combination with other techniques nowadays. However, the design variables are still selected depending upon operating conditions. There are many variables tested to investigate the NOx emission characteristics fur changing of fuel or air velocity, swirl intensity, and staging ratio of air and fuel in multi-staged burner. In air-staging case, the fuel-rich condition of the primary combustion zone is very helpful to reduce NOx emission and its range is known to be restricted by the increase of carbon monoxide. However, in many cases carbon monoxide level is not too high to be restricted operating condition. So we tried to expand the equivalence ratio range to the richer condition in the primary combustion zone and certificate the function of each burner component and its contribution to the overall NOx production.

콘덴싱 가스보일러 이용 코제네레이션 열저장 시스템 연구

조은성(Eun-Seong Cho),신성철(Seong Chul Shin),임경수(Kyung Su Lim),김용범(Yong-Bum Kim) 한국에너지학회 2008 한국에너지공학회 학술발표회 Vol.2008 No.-

메탄/공기 대향류 예혼합화염의 NO 발생특성에 관한 수치해석

조은성(Eun-Seong Cho),정석호(Suk Ho Chung) 한국연소학회 2004 한국연소학회지 Vol.9 No.4

평판형 예혼합 버너의 화염면 매질에 따른 연소 특성 연구

조은성(Eun-Seong Cho),신성철(Seong-Chul Shin),김용범(Yong-Bum Kim),최경석(Kyung-Suhk Choi) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10

The premixed burner is a very strong candidate for using household boiler burner system because it can make high efficiency, low emission and compact boiler system. Usually the household boiler burner system used as a bunsen type burner which consisted of inner rich premixed flame and fuel burned completely by secondary air supply. It has a relatively long flame length and operates in a high excess air ratio so it is difficult to fit the high efficiency compact boiler. In this paper, we were tested the characteristics of premixed combustion burner for the surface medium such as metal fiber, ceramic, and SUS fin. Above all, the cold flow characteristics of surface material has been tested and adjusted the even flow velocity over the burner surface. The combustion test was done by taking flame pictures and measuring flame temperature. The CO and NO<SUB>x</SUB> were measured and evaluated each characteristics of surface burner material for various excess air ration and heating value.

가정용 연료전지 시스템의 가스보일러 열저장 장치 개발

조은성(Eun-Seong Cho),신성철(Seong-Chul Shin),임경수(Kyung-Su Lim),박창권(Chang-Kwon Park),김용범(Young-Bum Kim) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5

Residential cogeneration system is a valuable method to use electrical power and hot water simultaneously. The electric power was made by mechanical engine, fuel cell, and photovoltaic etc. Among them we are interested in the fuel cell cogeneration system especially heat storage unit using condensing gas boiler. To study on the fuel cell residential cogeneration system, we made a heat storage unit which consists of storage tank, condensing gas boiler, water pump, heat exchanger, and piping system. Experiment was done in each component of heat storage system such as tank, water pump, heat exchange and system characteristics of floor heating and hot water supply operating with condensing gas boiler. And then we made 1㎾ PEMFC (Proton Exchange Membrane Fuel Cell) stack with water cooling system which will be linked with heat storage unit. Residential fuel cell power generation systems may be more and more feasible home appliances in the future.

두산중공업 수소 가스터빈 기술개발 현황 및 계획

조은성(Eun-Seong Cho),이동훈(Donghun Lee),이정우(Jungwoo Lee) 한국연소학회 2021 KOSCOSYMPOSIUM논문집 Vol.2021 No.5

경조사 부조금

조은성(Cho, Eunseong),변숙은(Byun, Sookeun) 한국문화산업학회 2014 문화산업연구 Vol.14 No.4

체면을 중시하는 한국 사회에서 부조금 지출이 가정 경제에 큰 부담이 되고 있으나, 부조금에 대한 학술적 조사는 거의 찾기 힘들다. 본 연구는 연령, 종교가, 소득, 자산, 학력, 직업, 주관적 사회지위, 자녀 결혼가능성, 체면민감성, 미혼자녀수가 부조금에 미치는 영향을 조사하였다. 연령대별(30, 40, 50, 60대) 및 성별에 따른 할당 표본추출을 실시하여 308명의 유효표본을 얻었다. 부조 횟수를 종속변수로 하는 회귀분석에서 직업, 자산, 자녀 결혼가능성, 주관적 사회지위가 유의하였다. 1회당 부조금에 연령, 연령제곱, 성별, 소득이 유의한 관계를 보였다. 부조금 총액에는 연령, 연령제곱, 직업, 자녀 결혼가능성, 주관적 사회지위가 유의하였다. 부조 횟수와 1회당 부조금에 영향을 미치는 요인은 서로 다르며, 부조 횟수와 1회당 부조금은 서로 상충 관계임을 제시하였다. 또한 흔히 알려진 것과는 달리 부의금보다 축의금 지출이 훨씬 더 많다는 것을 발견하였다. There has been little research efforts on spending behaviors of congratulatory or condolence money in Korea, despite its practical importance in the society. This study examined such spending behaviors by lifetime-event types (i.e., wedding, funeral, first-birthday party, and sixtieth-birthday party). This study is unique in that we examined the factors that are related to the frequency of giving congratulatory or condolence money, and the average amount of such spending per event, aswell as the total amount of such spending per year. Both positive and inverted-U relationships were hypothesized for the effects of age on the expenditure on congratulatory or condolence money. For the effects of the number of unmarried children, both positive and negative relationships were considered. Men were expected to give more money and give money more frequently for others" lifetime events, compared to women. Those who have a religion were expected to give money more frequently than those who do not have a religion. Income, asset, education level, occupation, subjective social position, the likelihood of their children’s wedding in the near future, and susceptibility for social face were also expected to have relationships with congratulatory or condolence money spending behavior. After excluding untrustworthy responses, 308 valid samples were obtained. We ran a series of regression analyses with three different dependent variables: the frequency of giving congratulatory or condolence money, and the average amount of such spending per event, as well as the total amount of the spending per year. Occupation, asset, and the likelihood of their children’s wedding in near future were significantly associated while subjective social position was marginally significant with the frequency of giving congratulatory or condolencemoney. Age, square of age, gender, and income were significantly related with the average amount of the spending per event. Age, square of age, occupation, and the likelihood of children’s wedding in near future were significantly associatedwith the total amount of the spending per year. Theoretical implications. Fist, the determinants of the frequency of giving congratulatory or condolence money are different from those of the average amount of spendingmoney per event. Second, there is a tradeoff between the frequency of giving congratulatory or condolencemoney and the average amount of spending per event. Third, people tend to spend more money for others" congratulatory events than condolence events. Lastly, more than half of the consumers seem to give less amount of money per event and give money less frequently than the fact known to everyone. 체면을 중시하는 한국 사회에서 부조금 지출이 가정 경제에 큰 부담이 되고 있으나, 부조금에 대한 학술적 조사는 거의 찾기 힘들다. 본 연구는 연령, 종교가, 소득, 자산, 학력, 직업, 주관적 사회지위, 자녀 결혼가능성, 체면민감성, 미혼자녀수가 부조금에 미치는 영향을 조사하였다. 연령대별(30, 40, 50, 60대) 및 성별에 따른 할당 표본추출을 실시하여 308명의 유효표본을 얻었다. 부조 횟수를 종속변수로 하는 회귀분석에서 직업, 자산, 자녀 결혼가능성, 주관적 사회지위가 유의하였다. 1회당 부조금에 연령, 연령제곱, 성별, 소득이 유의한 관계를 보였다. 부조금 총액에는 연령, 연령제곱, 직업, 자녀 결혼가능성, 주관적 사회지위가 유의하였다. 부조 횟수와 1회당 부조금에 영향을 미치는 요인은 서로 다르며, 부조 횟수와 1회당 부조금은 서로 상충 관계임을 제시하였다. 또한 흔히 알려진 것과는 달리 부의금보다 축의금 지출이 훨씬 더 많다는 것을 발견하였다. There has been little research efforts on spending behaviors of congratulatory or condolence money in Korea, despite its practical importance in the society. This study examined such spending behaviors by lifetime-event types (i.e., wedding, funeral, first-birthday party, and sixtieth-birthday party). This study is unique in that we examined the factors that are related to the frequency of giving congratulatory or condolence money, and the average amount of such spending per event, aswell as the total amount of such spending per year. Both positive and inverted-U relationships were hypothesized for the effects of age on the expenditure on congratulatory or condolence money. For the effects of the number of unmarried children, both positive and negative relationships were considered. Men were expected to give more money and give money more frequently for others" lifetime events, compared to women. Those who have a religion were expected to give money more frequently than those who do not have a religion. Income, asset, education level, occupation, subjective social position, the likelihood of their children’s wedding in the near future, and susceptibility for social face were also expected to have relationships with congratulatory or condolence money spending behavior. After excluding untrustworthy responses, 308 valid samples were obtained. We ran a series of regression analyses with three different dependent variables: the frequency of giving congratulatory or condolence money, and the average amount of such spending per event, as well as the total amount of the spending per year. Occupation, asset, and the likelihood of their children’s wedding in near future were significantly associated while subjective social position was marginally significant with the frequency of giving congratulatory or condolencemoney. Age, square of age, gender, and income were significantly related with the average amount of the spending per event. Age, square of age, occupation, and the likelihood of children’s wedding in near future were significantly associatedwith the total amount of the spending per year. Theoretical implications. Fist, the determinants of the frequency of giving congratulatory or condolence money are different from those of the average amount of spendingmoney per event. Second, there is a tradeoff between the frequency of giving congratulatory or condolencemoney and the average amount of spending per event. Third, people tend to spend more money for others" congratulatory events than condolence events. Lastly, more than half of the consumers seem to give less amount of money per event and give money less frequently than the fact known to everyone.

Cognitive and Affective Conflict between Marketing and R&D in New Product Development

조은성(Eunseong Cho),한민희(Minhi Hahn),현용진(Yong J. Hyun) 한국경영과학회 2011 經營 科學 Vol.28 No.2

This study investigates how cognitive and affective conflict affect performance and social outcomes in the new product situation. We examine the corporate, project, and personal characteristics that determine the level of interfunctional conflict between marketing and R&D. From a survey of Korean high-tech companies, we found:(1) time pressure was positively related to cognitive and affective conflict, (2) joint reward systems, interdepartmental connectedness, and years of education were negatively associated to cognitive conflict, (3) while cognitive conflict was positively related to new product creativity and NPD performance, affective conflict was negatively associated to marketing-R&D integration and perceived effectiveness of the relationship, as well as new product creativity and NPD performance.

군집의 수를 결정하기 위한 효과적 기준 - SPSS와 Microsoft Excel를 이용한 적용 사례

조은성(Cho Eunseong),황인석(Hwang Insuk) 한국상품학회 2008 商品學硏究 Vol.26 No.1

  마케팅에서 군집분석은 시장세분화 관련 연구 및 라이프스타일 관련 연구에서 활발하게 활용되고 있다. 그러나 기존 문헌에서는 군집분석의 방법론적 측면에 대해서는 충분한 관심을 기울이지 않는 경향이 있었다. 또한 흔히 사용되는 통계 소프트웨어인 SPSS에서는 군집의 수를 결정하기 위해 활용될 수 있는 기준이 제공되지 않고 있다. 따라서 군집의 수를 결정하기 위한 객관적 기준이 존재하지 않는 것으로 오해되는 경우가 있으며, 연구자들은 군집의 수를 결정할 때 여러 가지 휴리스틱에 의존하는 경우가 많다.<BR>  본 연구에서는 군집의 수를 결정하기 위해 활용되어 온 여러 가지 방법(e.g., 해석가능성, 균등 비율, 스크리 테스트, MANOVA)을 검토하고 그 한계점을 논의한다. 군집의 수를 결정하는 30 가지 객관적 기준의 효과성을 비교한 Milligan and Cooper (1985)의 연구를 검토하며, 그들의 조사 결과 가장 효과적인 기준으로 밝혀진 Calinski and Habarasz (1974)의 방법과 Duda and Hart (1973)의 방법을 설명한다. 마지막으로, SPSS와 Microsoft Excel을 이용하여 이 두 가지 방법을 적용하는 사례를 제시한다. 본 연구 결과는 군집의 수를 결정할 때 효과적 기준을 적용하고자 하는 연구자들에게 도움을 줄 수 있다.   Cluster analysis has been an important analytical tool in marketing, especially among market segmentation and lifestyle researchers. SPSS, the most widely used statistical software among marketing researchers, does not provide any criteria for determining the number of clusters. And the marketing literature has paid insufficient attention to methodological aspects of cluster analysis. Such situations lead to a widely-held misunderstanding that there are no objective criteria for determining the number of clusters.<BR>  This study reviews several methods for determining the number of clusters (that is, interpretability, balanced ratio, scree test and MANOVA), and discuss their limitations. We introduce the results of Milligan & Cooper (1985), who compared the effectiveness of thirty methods for determining the right number of clusters. We also explain the methods proposed by Calinski & Habarasz (1974) and Duda & Hart (1973), which are the most effective criteria according to Milligan & Cooper (1985). Finally, this study illustrates how to apply Calinski & Habarasz (1974)"s and Duda & Hart (1973) "s methods for determining the number of clusters using SPSS and Microsoft Excel. The study can be helpful to those who seek effective criteria for determining the number of clusters.

소비자학연구에 발표된 논문들의 인용 분석

조은성 ( Eun Seong Cho ),김세나 ( Sie Na Kim ) 한국소비자학회 2007 소비자학연구 Vol.18 No.1