초초임계압 석탄화력 보일러 수냉벽 수관의 용접신뢰성 향상방안

안종석,문승재,Ahn, Jong-Seok,Moon, Seung-Jae 한국플랜트학회 2010 플랜트 저널 Vol.6 No.3

This paper presents failure analysis on weld-joint of the waterwall tubes in USC boilers. Visual inspections were performed to find out the characteristics of the fracture. Additionally both microscopic characteristics and hardness test were carried out on failed tube samples. Failures seem to happen mainly because the welding process such as preheating and PWHT(post-weld heat treatment) was not conducted strictly. Thus, this paper has the purpose to describe the main cause of the poor welding process and to explain how to prevent similar failures in those weld-joints.

석탄화력발전용 초초임계압(USC) 보일러 수냉벽 튜브 용접 신뢰성 향상에 대한 연구

안종석,이승현,조상기,이길재,이창희,문승재,Ahn, Jong-Seok,Lee, Seung-Hyun,Cho, Sang-Kie,Lee, Gil-Jae,Lee, Chang-Hee,Moon, Seung-Jae 대한용접접합학회 2010 대한용접·접합학회지 Vol.28 No.1

The low alloy-steel material(1.0Cr-0.5Mo, SA213T12), which has widely been used for the waterwall tube in the conventional power plant, do not have enough creep rupture strength for waterwall tubes of the Ultra-supercritical(USC) boilers. According to this reason, the high-strength low alloy-steel(2.25Cr-1.0Mo, SA213T22) has newly been adopted for the waterwall tube in the USC boilers. This paper presents failure analysis on weld-joint of the waterwall tubes in USC boilers. Visual inspections were performed to find out the characteristics of the fracture. Additionally both microscopic characteristics and hardness test were carried out on failed tube samples. Failures seem to happen mainly because the welding process has not been conducted strictly.(preheating, P.W.H.T and so forth). Thus, this paper has the purpose to describe the main cause of the poor welding process and to explain how to prevent similar failures in those weld-joints.

대구경-후판 압력용기용 저 합금강(Mn-Mo)의 용접특성

안종석,박진근,윤재연,Ahn, Jong-Seok,Park, Jin-Keun,Yoon, Jae-Yeon 대한용접접합학회 2012 대한용접·접합학회지 Vol.30 No.6

Recently the low alloy steel plate made with manganese-molybdenum is used widely in steam drum and separator of the new coal-fired power plant boiler. This material is suitable for the vapor storage of high pressure and high temperature. The high temperature creep strength of Mn-Mo alloy is higher than the carbon plate(SA516) that used in the subcritical pressure boiler. It reduces the thickness of the pressure vessel and makes the lightweight possible. Recently in the power plant boiler operation and production process, the damage has happened frequently in the heat affected zone and base material according to the hydrogen crack and delayed crack. This paper describes the research result about the damage case experienced in the boiler steam drum production process and present the optimum manufacture method for the similar damage prevention of recurrence.

중국 소비자의 주요국 국가이미지 지각의 변화(2006∼2012) 실태

안종석(Jong Seok Ahn),정소희(So Hee Jeong) 영남대학교 중국연구센터 2012 중국과 중국학 Vol.17 No.-

The purpose of this study is to investigate the changes of the perception of Chinese consumers on the country images of major 4 countries(U.S., Germany, Japan, Korea) from 2006 to 2012. This study investigates the channel of the country image association, the perception of country images, the evaluation of the general product images, and the attitude toward foreign products of major 4 countries. To accomplish the research objectives, this study exploits 2 sets of survey data which were gathered from 991 Chinese consumers in 2006 and 1,084 Chinese consumers in 2012. Each data sets includes consumers of 4 major cities(Beijing, Shanghai, Qingdao, Shenyang) of China. The results of this study show that Chinese consumers depends on the different association channels in perceiving country images among countries. News media is most important association channel and political leaders and political relationship is the most important association source of country images of U.S., Germany, and Japan. In perceiving country image of Korea, however, star performers and popular culture are most important even though the political factors are more and more important recently. Chinese consumers perceives country images differently among 4 major countries and a little changes have happened during 2006∼2012 periods. The country images of 4 countries shows statistical differences at 2006 and 2012 data set respectively and country images of some countries show statistical differences during 2006∼2012 periods. Relational image and people image of Korea have been worse during 2006∼2012. As Chinese perception of the country images changes during 2006∼2012, the evaluation and attitude toward the products of 4 major countries have changed. After all, the evaluation and attitude toward Korean products have been more and more worse than the other countries.

중국 소비자의 한국, 일본, 미국에 대한 적대감과 그 효과에 관한 연구: 라이프스타일과 국가별 차이를 중심으로

안종석 ( Jong Seok Ahn ) 한국국제경영학회 2015 國際經營硏究 Vol.26 No.2

본 연구는 외국제품에 대한 중국 소비자의 제품 평가 및 태도에 영향을 미치는 대표적인 감정적 요인으로 소비자 적대감에 관심을 가진다. 보다 구체적으로 본 연구는 중국 소비자의 미국, 일본, 그리고 한국에 대한 적대감의 라이프스타일에 따른 차이, 그리고 중국 소비자의 이들 3개국에 대한 적대감 효과의 차이를 살펴보았다. 이를 위해 본 연구에서는 상해, 북경, 청도, 심양, 성도 등 중국 내 5개 주요 도시의 840명의 성인 소비자들을 대상으로 설문조사를 실시하여 중국 소비자들의 라이프스타일과 미국, 일본, 그리고 한국에 대한 적대감, 그리고 이들 국가의 전반적 제품에 대한 중국 소비자들의 제품평가 및 제품에 대한 태도에 관한 자료를 수집하였다. 연구결과, 중국 소비자의 라이프스타일은 과시적 유행추구형, 합리적 개성추구형, 전통적 보수지향형으로 나누어졌으며, 중국 소비자들의 미국. 일본, 한국에 대한 적대감은 라이프스타일의 유형에 따라 상이하게 나타났다. 또한 중국 소비자들의 미국, 일본, 그리고 한국에 대한 적대감이 이들 국가의 전반적인 제품에 대한 평가 및 태도에 미치는 영향도 다르게 나타났다. This study focuses on the consumer animosity of China as an important affective factor which influences on the evaluation and attitude toward foreign products. More specifically, this study is to examine the differences of the consumer animosity by the types of the lifestyle of Chinese consumers and the differences of the consumer animosity effects among 3 countries(Korea, Japan, US). This study used the data which were collected through Chinese consumers survey. The sample of this study is adults consumers who are above 18 years old and reside at 5 major cities of China(Beijing, Shanghai, Qingdao, Shenyang, and Chengdu). 840 Chinese consumers answered the questionnaire on the 3 major foreign countries and their products in general. The results can be summarized as follows : Firstly, Chinese consumers animosity toward 3 major countries shows differences by the lifestyles which were classified as 3 types(conspicuous and fashion-seeking, rational and personality-seeking, traditional and conservatism-seeking). Secondly, consumer animosity effects of Chinese consumers which represent the impact of consumer animosity on the foreign product evaluation and the attitude toward foreign products show differences among 3 major countries.

초초임계 석탄발전 보일러 튜브(SA213 TP347H) 용접부 안정화 열처리 효과

안종석(Jong-Seok Ahn),박진근(Jin-Keun Park),이길재(Gil-Jae Lee),윤재연(Jae-Yeon Yoon) 대한용접·접합학회 2015 대한용접·접합학회지 Vol.33 No.4

Austenite stainless steel(SA213-TP347H) has widely been used for the superheater & reheater tube in USC(ultra-supercritica) coal boiler because of its high creep rupture strength and anti-oxidation. But recently, the short-term failures have happened frequently in heat affected zone for only 4,000~15,000hours of service. Many investigations have been conducted to understand the failure mechanism. The root cause of failure was comfirmed to "strain induce participation hardening crack" or "reheat cracking". This mechanism often occurred due to weld residual stress and precipitation of the Cr, Nb carbides in the stabilized stainless steel such as TP347H. This paper presents an analysis of failure tube and effect of the sample tubes that conducting stabilizing heat treatment in site after 11,380hours & 16,961hours of service. Visual inspection was performed. In addition, microscopic characteristics was identified by O.M, SEM, and hardness test was carried out to find out the heat treatment effects. Failures seem to happen because of being not conducted stabilizing heat treatment in site. And another cause is inadequate weld parameter such as pass, ampere, voltage, inter-pass temperature. Thus, this paper has the purpose to describe that how to prevent similar failures in those weld-joints.

중국 진출 한국기업 주재원의 현지 문화적응 유형과 조직몰입에 관한 연구

안종석 ( Jong Seok Ahn ) 한국외국어대학교 국제지역연구센터 중국연구소 2010 中國硏究 Vol.49 No.-

The exploitation of overseas expatriate managers is the one of most basic problems which MNCs face in the foreign market. This study focuses on the Korean expatriates in China which is the most admired market to Korean firms. At first, this study classifies the types of cultural adjustment of Korean expatriates. And then this study investigates expatriates` demographic characteristics and the degree of the multidimensional organizational commitment according to the types of cultural adjustment. The result of this study shows the types of cultural adjustment was classified into 4 categories, integration, assimilation, separation, and marginalization, as suggested by Berry`s model. There was found some differences in demographic characteristics such as sex, marital state, major, staying types(with or without family), and the place of residence by the 4 types of cultural adjustment. And there existed some differences in the degree of the organizational commitment according to the types of the cultural adjustment.

우리나라 대중국 직접투자기업의 경성성과 결정요인 - 시장 및 소유권전략을 중심으로 -

안종석 ( Jong Seok Ahn ) 한국국제경영학회 1996 國際經營硏究 Vol.7 No.1

본 연구는 중국이 우리나라 기업들의 최대 투자대상국으로 부상하면서 중국으로의 해외직접투자에 대한 연구가 보다 활성화되어야 한다는 당위성 아래 기존의 투자업체 및 중국 관련조사자들에게 일반적으로 인식되고 있는 `수출위주일수록, 소유권의 지배를 강화할수록 경영성과가 양호하다`는 주장의 논리적 근거를 제시하고, 이를 실증적으로 분석해 보고자 하였다. 본 연구는 대중국 직접투자 성과 결정요인으로서 시장전략(수출위주 혹은 내수위주)과 소유권전략이 제시되는 이유를 중국이라는 지역이 가지는 환경불확실성 때문으로 인식하고, 이러한 불확실한 외부환경을 관리할 수 있는 효과적인 수단으로 수출위주의 시장전략과 지배적인 소유권을 선택함으로써 경영성과를 제고시킬수 있는 것으로 파악하였다. 연구결과 우리나라 기업들의 대중국 직접투자에서 환경불확실성은 수출위주의 시장전략에 긍정적인 영향을 미치는 것으로 나타났으나, 환경불확실성이 지분비율에 미치는 효과는 미미한 것으로 드러났다. 또한 환경불확실성-경영성과의 관계에서 수출비율은 환경불확실 성에 영향을 받으면서 경영성과에도 독자적으로 영향을 미치는 중개변수(intervening variable)의 효과를, 그리고 지분비율은 경영성과와는 직접적인 관계없이 환경불확실성이 경영성과에 미치는 부정적인 영향을 완화시켜 주는 중재변수(moderated variable)의 역할을 하고 있는 것으로 나타났다.

국제인수합병 이후 국내 근로자의 직무스트레스와 조직몰입에 관한 연구

안종석 ( Jong Seok Ahn ),박광서 ( Kwang Seo Park ) 한국국제경영학회 2004 國際經營硏究 Vol.15 No.3

중국 소비자의 적대감이 국가이미지 효과에 미치는 영향

안종석 ( Jong Seok Ahn ) 한국국제경영학회 2014 國際經營硏究 Vol.25 No.2

본 연구는 중국 소비자의 외국제품에 대한 평가 및 태도에 영향을 미치는 대표적인 감정적 요인으로 소비자 적대감에 관심을 가진다. 보다 구체적으로 본 연구는 국가이미지 효과의 전 과정(국가이미지→제품평가→제품에 대한 태도)에 소비자 적대감이 어떤 영향을 미치는 지를 살펴보고자 한다. 이를 위해 본 연구에서는 상해, 북경, 청도, 심양, 성도 등 중국 내 5개 주요 도시의 1,327명의 성인 소비자들을 대상으로 설문조사를 실시하여 중국 소비자들의 주요국(미국, 독일, 일본, 한국)에 대한 적대감, 국가이미지 지각, 그리고 이들 국가의 전반적 제품에 대한 중국 소비자들의 제품평가 및 제품에 대한 태도에 관한 자료를 수집하였다. 연구결과, 소비자 적대감의 두 가지 유형인 국가적 적대감과 개인적 적대감은 국가이미지 효과를 구성하는 변수들에 상이한 영향을 미치고 있는 것으로 나타났다. 개인적 적대감은 국가이미지, 제품평가, 그리고 제품에 대한 태도에 일관되게 부의 영향을 미치는 반면, 국가적 적대감은 국가이미지 차원 중에는 관계이미지에만 부의 영향을 미치는 것으로 나타났고, 경제이미지와 제품평가에는 오히려 정의 영향을 미치는 것으로 나타났으며, 제품에 대한 태도에 미치는 영향도 비유의적으로 나타난 것이다 This study focuses on the consumer animosity of China as an important affective factor which influences on the consumers’ evaluation and attitude toward foreign products. More specifically, this study is to examine how the consumer animosity influences all the processes of country image effect(country image→product evaluation →attitude toward foreign product). This study used the data which were collected through Chinese consumers survey. The sample of this study is adults consumers who are above 18 years old and reside at 5 major cities of China. They are Beijing, Shanghai, Qingdao, Shenyang, and Chengdu. 1,327 Chinese consumers answered the questionnaire on the consumer animosity, country image, product evaluation, and the attitude toward product of 4 major foreign countries(US, Germany, Japan, South Korea). The results show that different types of consumer animosity(national/personal) influence differently on the variables contained in the model of country image effect. Whereas personal animosity consistently shows negative impact on the country image, product evaluation, and the attitude toward product, national animosity shows inconsistent relations with them. National animosity has negative impact on the relational country image, but positive impact on the economic country image and the product evaluation. National animosity shows insignificant impact on the attitude toward foreign product.