Nd:YAG 레이저 충격 피닝에 의한 금속표면의 잔류응력 특성 개선

양세영,최성대,전재목,공병채,Yang, Se-Young,Choi, Seong-Dae,Jun, Jea-Mok,Gong, Byeong-Chae 한국생산제조학회 2010 한국생산제조학회지 Vol.25 No.6

Laser shock peening is useful to improve fatigue characteristic of multiple number of metals and alloys. This process induces a compressive residual stress on the metal surface, and when tensile load is applied, growth of crack is delayed and which changes the characteristic of the metal surface. It is an innovative surface treatment technique for strengthening metals. Specimens of SM45C are used in this study. The effect of an inertial tamping layer on the residual stress field using laser shock peening setup and Nd:YAG laser power is evaluated. Residual stress distribution measured by X-ray diffraction. As a result of this study it can be presented that following condition of Nd:YAG laser power and inertial tamping layer parameters, compressive residual stress is generated on the surface of the SM45C. Results to experimental data indicate that laser shock peening has great potential as a means of improving the mechanical performance of the metal surface.

레이저 빔에 의한 박판금속의 강화특성

양세영,최성대,김기만,전재목,공병채,Yang, Se-Young,Choi, Seong-Dae,Kim, Gi-Man,Jun, Jea-Mok,Gong, Byeong-Chae 한국생산제조학회 2010 한국생산제조학회지 Vol.26 No.2

The general way to process the surface by means of the laser was heat treatment for strengthening the surface hardness. They have used the laser for changing the property of the surface, especially for metal. Generally, it is recent increasing tendency to use the thin plate panel for making things smaller and lightweight. However, thin plate should be strengthened or let the thin plate panel have moment of inertia by means of engraving the groove or wave on them for lightweight and strengthening. Therefore it is expected that the thin plate panel can be harder and more stable through processing the metal surface by laser beam irradiation and the hardness of thin plate possibly can be also changed how many parts of them are harden. Through this research, it can be grasped how the hardness and mechanical characteristic changes according to width and depth of groove by laser affect the max stress by the ratio of $A_H/A_T$ (hardening area/total area) and characteristic of displacement and structural characteristic for making the thin plate harder by the strengthening metal surface of thin plate by laser through the experiment and analysis of FEA can be presented.

레이저에 의한 금속표면의 강화 특성

양세영(Se-Young Yang),공병채(Byeong-Chae Gong),김잠규(Jam-Kyu Kim),최성대(Seong-Dae Choi),정선환(Seon-Hwan Cheong) 한국기계가공학회 2009 한국기계가공학회 춘추계학술대회 논문집 Vol.2009 No.6월

The general way to process the surface by means of the laser was heat treatment for strengthening the surface hardness. They have used the laser for changing the property of the surface, especially for metal. Generally, it is recent increasing tendency to use the thin plate panel for making things smaller and lightweight. However, it is needed to install something upholding at the thin plate panel or engrave the grooves or wave on them so that they have moment of inertia or can be strengthened, Therefore it is expected that the thin plate panel can be harder and more stable through processing of the metal surface by laser beam irradiation and hardness of thin plate possibly can be also changed how many parts of them are harden. Through this research, it can be grasped how the hardness changes and mechanical characteristic changes by width and depth of groove by laser affect the von-mises by the ratio of hardening area/total area and characteristic of displacement and structural characteristic for making the thin plate harder by the strengthening metal surface of thin plate by laser through the experiment and analysis of FEA can be presented.

군산과 목포화교의 비교연구 ― 초기 이주과정과 일제 강점기 상업활동을 중심으로 ―

양세영 ( Yang¸ Se-young ) 전남대학교 호남학연구원 2020 호남학 Vol.0 No.68

본 고는 호남의 대표 항구이자, 개항과 일제강점기의 유사한 역사적 경험을 공유하며 호남지역에서 화교의 진출과 활동이 가장 활발했던 군산과 목포를 대상으로 화교사회에 대한 비교연구를 시도하는데 목적이 있다. 연구의 초점은 두 도시에 거주했던 화교들의 이주와 상업활동에 있어서 공통점과 차이점을 발굴하고 그 이유를 규명하는데 두고자 하였다. 본 연구의 결과는 이러한 예상과 부합되는 많은 공통점을 보여주었으나 동시에 차이점도 상당하다는 것을 보여주었다. 공통점으로는 먼저 개항이후 적어도 1937년 중일 전쟁 이전까지는 지속적으로 화교인구가 성장세를 보였다는 점이다. 또한, 포목점을 비롯한 상업활동이 화교사회의 핵심 사업이었다는 점이다. 셋째, 일제의 견직물 고관세 조치에 사업구조를 개편하는 등 적극적으로 대응하여 상업활동을 지속하였다는 점이다. 넷째, 금융활동 측면에서 적극적인 대출과 아울러 높은 저축률을 통해 건실한 재무구조를 바탕으로 사업활동을 영위하였다는 점이다. 차이점은 먼저 군산이 도시 전체인구는 목포 보다 적었지만 대부분의 시기에 화교인구는 2배 이상의 규모를 유지했다는 점이라 할 수 있다. 둘째, 군산은 포목업과 잡화점을 함께 운영하였고 판매방식도 도매와 소매를 겸업하는 형태인데 반해 목포는 상대적으로 도매와 소매가 구분되는 방식으로 영업을 하였다는 점이다. 셋째, 포목업의 경우 군산은 서울과 인천에 있는 대형상점의 지점형태가 주류를 차지한 반면 목포는 지역상인을 중심으로 독자적인 사업형태를 보였다는 점이다. 넷째, 금융활동면에서 목포는 군산과는 다르게 예금액이 대출액을 능가하거나 균형을 이루었다는 점에서 보다 튼튼한 재무구조를 형성했다는 점이다. 본고에서는 이러한 공통점과 차이점이 나타난 이유에 대해 시대적 및 지역적 배경을 통해 분석을 시도하였다. 향후 이 부분은 보다 다양한 차원에서 분석이 이루어져야 할 필요성이 있다. The purpose of this study is to try comparative research on the society of Overseas Chinese(Hwagyo) in Gunsan and Mokpo, which were the most active ports in the Honam region and shared similar historical experiences in the period of opening ports and Japanese colonial eras, and in which Overseas Chinese activities were most activated. The focus of the study was to find common ground and differences in the migration process and commercial activities of Hwagyo in the two cities and to find out why. The results of this study showed many commonalities consistent with these expectations, but at the same time, the differences were significant. In common, the population of Hwagyo continued to grow until at least the Sino-Japanese War in 1937 after the opening of the port. In addition, commercial activities, textile sales in particular were the core business of the Hwagyo society in two cities. Third, they continued their commercial activities by actively responding to the Japanese government's high tariff measures on silk fabrics, including the reorganization of the business structure. Fourth, the companies of Hwagyo engaged in business activities based on a sound financial structure, as evidenced by its active lending and high savings rates in terms of financial activities. The difference is that though the entire population of Gunsan was smaller than Mokpo, the population of Hwagyo was more than doubled in most times. Second, The textile companies of Hwagyo in Gunsan operated a wholesale and retail store together, while in Mokpo operated separately. Third, the textile business of Hwagyo in Gunsan was running by the branch types of large stores in Seoul and Incheon, while in Mokpo by their own business style centered on local merchants. Fourth, in terms of financial activity, Mokpo, unlike Gunsan, has formed a stronger financial structure in that deposits exceed or balance loans. This paper attempted to analyze the reasons for these similarities and differences through historical and regional backgrounds. In the future, this part needs to be analyzed at a more diverse level.

개항기 및 일제 강점기 전기(前期, 1893~1924년) 목포화교의 경제 · 사회적 활동에 관한 연구

양세영(Yang, Se-Young) 역사문화학회 2018 지방사와 지방문화 Vol.21 No.2

본 연구는 개항기와 일제 강점기 전기(1893~1924)의 목포 화교들의 경제 및 사회적 활동을 조명함으로서 지역화교 연구의 지경을 확대하고자 하였다. 이 시기의 목포화교는 한국 화교의 일부로서 갖는 공통적 맥락 외에 차별화되는 몇 가지 특징을 갖고 있다. 첫째, 일제의 집중적인 견제 속에서 화교사회를 구축했다는 것이다. 일제는 목포 개항 직후부터 인천과 원산에서 청국에 뺏긴 경제적 주도권을 되찾고자 청국상인들의 이주를 철저히 방해하였다. 둘째, 목포화교는 전국에서 포목업 비중이 가장 높은 수준을 보이며 활발하게 상업 활동을 전개하였다. 셋째, 목포 화상들은 전국에서 재무적으로 가장 견실한 영업을 영위하였다. 1920년대 1인당 저축금액이 전국적으로 압도적인 1위를 차지하였고 예금액이 대출액을 크게 상회하였다. 넷째, 단신 거주자의 비율이 전국에서 가장 높은 수준을 보였다. 다섯째, 목포화교는 전남지역 화교 확산의 허브 역할을 하였다. 목포는 전남의 관문도시로서 호남선과 영산강 뱃길 등을 통해 도청 소재지인 광주와 나주 등 전남내륙과 정기노선을 통해 제주 등으로 화교가 진출하는데 교두보 역할을 하였다. 동 기간 중 목포화교의 활동이 주는 가장 큰 시사점은 기업가정신에 주목할 필요가 있다는 것이다. 목포화교가 처음 이주한 1893년은 개항 전으로 교통과 도시기반 등의 여건이 거의 갖추어지지 않은 상황이었다. 기존 개항장의 안정된 사업환경을 벗어나 새로운 경제적 기회를 찾아 과감하게 목포에 진출하였다는 점과 일제의 지속적인 견제 속에서도 왕성한 사업활동을 추진했다는 점은 새로운 기회를 찾아 도전과 혁신을 추구한다는 현대의 기업가정신의 개념과도 부합되며 최근 목포-중국 간 경제교류 활성화의 필요성과 관련하여 시사하는 바가 크다. This study was intended to examine mainly the economic and social activities of overseas chinese in Mokpo(Mokpo Hwagyo) during the period to opening ports toward foreign countries and Japanese occupation(1893~1924), which was expected to expand scope of research on Hwagyo in major cities of Korea. Mokpo Hwagyo during this period have several distinctive characteristics, sharing common characteristics of Korean overseas chinese. First, they built a their community and carried out a vigorous commercial activity under the intense oppression of Japanese colonial rule. Second, they actively engaged in economic activities, especially in silk fabric industry with the highest proportion of their businesses in comparison to other regions. Third, they had the strongest financial structure in Korean overseas chinese society. In the 1920s, their per capita savings topped the list nationwide, and deposits surpassed lending. Fourth, the ratio of single male residents was the highest compared to other regions in the country. Fifth, Mokpo Hwagyo served as a hub for the spread of overseas Chinese in Chonnam Province such as Gwangju, Naju, and Jeju. The biggest implication of Mokpo Hwagyo’s activities during this period is that it is necessary to pay attention to their entrepreneurship. They first came to Mokpo in 1893 before opening it’s port toward Foreign countries, when there were few conditions such as transportation and urban infrastructure. Japanese held back their activities while in Mokpo. Despite these bad conditions, they challenged to find a new opportunity and continued their business until Sino-Japanese War(1937).

CO₂ 레이저 빔 조사에 의한 프레스 금형재료의 표면경화 특성

양세영(Se-Young Yang),최성대(Seong-Dae Choi),최명수(Myeong-Soo Choi),전재목(Jae-Mok Jun) 한국기계가공학회 2011 한국기계가공학회지 Vol.10 No.1

Recently, the technology of surface treatment is being more important which affects the material cost reduction and substitution to the expensive material. The material used for the mechanical processing should have not only high intensity, but also strength toughness, wear resistance and corrosion resistance. In order to increase the durability and have better quality of the parts using such kind of tooling material, various kinds of research of the surface hardening through many kinds of heat resources is being done and practically applied. In this study, the characteristics of hardening surface zone for high strength of the press die material through laser beam irradiation are researched. In this study, it is experimentally observed by the status of the surface morphology, tensile strength, the hardness distribution of the base metal and wear condition by the surface hardness pattern by the laser beam based on the process parameters of CO₂ laser by using SM45C and STD11 used for press tool. Through this research, the characteristics of surface hardened zone for high strength of the thin metal by laser beam irradiation is done.

기업의 윤리 프로그램 실행이 이해관계자 만족과 재무성과에 미치는 영향에 관한 연구

양세영(Se Young Yang),박오수(Oh Soo Park) 한국경영학회 2010 經營學硏究 Vol.39 No.6

Korean big companies have adopted and implemented ethics programs since financial crisis in 1997. Corporate ethics program is defined as values, policies and activities that impact the propriety of organization (Brenner. 1992). Ethics program can be classified into 2 groups: one is explicit program and the other is implicit program. The explicit components of ethics programs include such as: codes of ethics, ethics training, ethics committees and officers. internal control system, help line etc. Implicit parts of ethics program include such as: leadership, corporate culture. communication, performance measurement systems etc. This study suggests that implicit program needs to be defined in terms of ethical context such as ethical culture and climate, ethical leadership. etc. Despite increasing interest in the importance of business ethics, there are very few empirical studies on the effectiveness of ethics program, specially on the relationship between ethics program and performance. The purpose of this research is to ascertain whether ethics programs Korean companies have implemented are effective or not. The specific objectives of this study are to: 1) examine whether ethics programs have positive effect on financial performance and non-financial performance(stakeholder`s satisfaction)2) identify mediation effect of stakeholder`s satisfaction between ethics program and financial performance 3) investigate which program is more effective in ethical management. Based on literature survey and preliminary interview with 10 ethics officers of Korean big companies, the hypotheses which were tested in this study are framed as follows: HI: Explicit ethics program will have a positive impact on the satisfaction of stakeholders. H2: Explicit ethics program will have a positive impact on the financial performance. H3: The satisfaction of stakeholders will mediate the relationship between explicit ethics program and financial performance. H4: Implicit ethics program will have a positive impact on the satisfaction of stakeholders. H5: Implicit ethics program will have a positive impact on the financial performance. H6: The satisfaction of stakeholders will mediate the relationship between implicit ethics program and financial performance. To test these hypotheses. survey using questionnaires with related items was conducted and data were collected from 80 Korean large companies. The results analyzed by hierarchical polynomial regression procedures are as follows. Period of ethics office operation among explicit ethics programs only has a positive impact on the satisfaction of stakeholders and financial performance, while all parts of implicit ethics program have a positive impact(H1, H2 partly accepted. H4. H5 fully accepted). Explicit ethics program(except for period of ethics office operation) and financial performance are not mediated by satisfaction of stakeholders, while implicit ethics program and financial performance are mediated partly by satisfaction of stakeholders. These outcomes provide no support for H3. while part support for H6. The results are significant in three aspects. First, this study showed relationship between ethical management and performance in a degree through empirical analysis on Korean companies. Second. this study proves mediation effect of stakeholders satisfaction between ethics program and financial performance in empirical way. This result is in accordance with existing stakeholder theories. Third. this study makes sure that ethics programs Korean companies have implemented since 1997 are effective to some extent. This study has several implications like followings. First, Ethical management of Korean corporates had a fruitful outcome to a certain degree in the ethics practices focusing on operating ethics programs since 1997. Second. in working level, corporates need to make an effort more on satisfying various stakeholders in ethical management. Third, companies should also focus more on such progra

일제 강점기 전남지역 화교의 정착과정과 경제·사회적 활동

양세영 ( Yang Se-young ) 전남대학교 호남학연구원 2021 호남학 Vol.- No.70

본 고는 그동안 연구되지 않았던 전남지역 화교의 이주와 생활상을 인구통계학적 관점에서 검토함으로서 광주·전남화교 연구의 기본적인 토대를 구축하는데 목적을 두었다. 나아가 전남화교가 타 지역 화교와 비교하여 갖는 특징이 무엇인지 발굴하고, 국내 화교사 전체 맥락 속에서 차지하는 의의를 찾는데 목적이 있다. 이를 위해 본고는 일제 강점기를 중심으로 전남화교의 정착과정과 경제·사회적 활동을 살펴보았다. 전남화교의 기원은 1893년 목포로 이주한 2명의 상인이며 전국에서 4번째로 화교가 이주한 지역으로서의 의의가 있다. 1917년에는 전남의 22개 시·군지역 전체에 화교가 분포하여 거주하였고, 1925년에는 일제 강점기 중 가장 많은 화교가 거주하는 발전기를 맞았다. 이러한 화교인구의 증가와 정착의 확대는 포목업을 중심으로 하는 활발한 상업활동의 결과다. 중국에서 들여온 값싸고 품질좋은 포목제품은 농업중심사회이며 인구가 많아 수요가 컸던 전남지역에서 높은 경쟁력을 가졌다. 포목업외에도 잡화점, 주물공업, 음식업, 채소재배, 건축과 단순노동 등의 경제 활동에 화교들은 종사하였다. 그러나, 1931년 만보산 사건과 1937년 중일전쟁의 발발로 이러한 경제활동은 큰 타격을 받았고 본국으로 귀환하는 화교들이 늘어났으며, 지역 경제 침체와 함께 전남지역의 화교비중은 전국에서 비교적 낮은 수준으로 전환되었다. 사회적으로는 중화상회라는 단체 설립을 통해 지역별로 공동체를 형성하였으며, 만보산 사건 중에는 다른 지역에 비해 큰 피해가 없었다. 이는 화교가 전남지역 주민과의 관계가 비교적 좋았고. 특히 1930년 광주-여수 철도 부설 현장에서 일본인 건설업자에 대항하여 동맹파업을 하는 등 국내 화교사에 유례가 거의 없는 긴밀한 관계를 유지한 것에 기인한다고 볼 수 있다. 일제 강점기의 일정기간 융성했던 화교사회와 활발했던 경제활동은 향후 광주·전남과 중국간 교류 활성화의 필요성과 이를 위해서는 지역경제의 발전이 선행되어야 한다는 것을 시사한다고 할 수 있다. This paper primarily attempted to establish the basic foundation for the research on the overseas Chinese of Jeollanam-do by reviewing the migration and life of them from a demographic perspective, which had not been studied before. Furthermore, the purpose is to discover the characteristics of Jeonnam overseas Chinese compared to other local Chinese and to find the significance in the entire context of overseas Chinese history in Korea. To this end, this paper examined the settlement process and economic and social activities of Jeonnam overseas Chinese during the Japanese colonial period. The origin of Jeonnam overseas Chinese is two merchants who migrated to Mokpo in 1893, which is significant in that Jeonnam was the fourth region in the country where Chinese immigrated. In 1917, overseas Chinese were distributed and lived throughout entire areas of 22 city and counties in Jeollanam-do, and in 1925, they faced the development period in which the largest number of overseas Chinese lived during the Japanese occupation. This increase in the overseas Chinese population and expansion of settlement are the result of active commercial activities centered on the textile industry. Cheap and high-quality textile products imported from China were highly competitive in Jeollanam-do, where demand was high due to the large population in agricultural society. In addition to the textile industry, overseas Chinese were engaged in economic activities such as miscellaneous goods stores, casting industries, food, vegetable cultivation, architecture and simple labor. However, the Manbosan Incident in 1931 and the outbreak of the Sino-Japanese War in 1937 hurt these economic activities, and the number of overseas Chinese returning to their home countries increased, and the proportion of overseas Chinese in Jeollanam-do shifted to a relatively low proportion nationwide. Socially, communities were formed by region through the establishment of an organization called the Chinese Commercial Association, and during the Manbosan Incident, Jeonnam was one of safest areas where Chinese people could live across the country without much damage. This can be attributed to the good relationship with residents of Jeollanam-do, and the close relationship that is unprecedented in the history of overseas Chinese in Korea, such as an alliance strike against Japanese builders at the Gwangju-Yeosu railway site in 1930. The active economic activities with the Chinese society, which flourished from 1917 to 1930 during the Japanese colonial period, suggest that relationship and exchanges between Jeonnam and China need to be further activated, and for this, the development of the local economy must precede.

해방 후 제주화교 사회의 재건과정과 경제·사회적 활동에 대한 연구

양세영(Se-Young Yang) 제주학회 2022 濟州島硏究 Vol.58 No.-

본 고는 해방 이후 제주화교 사회의 재건 과정과 그 결과가 제주화교의 생활에 미친 영향을 살펴봄으로서 현대 제주화교사를 보다 풍부하게 복원하는데 목적이 있다. 또한, 국내 화교사 연구에 있어 해방 이후를 대상으로 한 연구가 매우 부족한 상황에서 동시대의 제주화교에 대한 연구를 통해 전체 화교사의 지평을 확대하고자 하였다. 연구를 통해 밝혀진 주요 사실은 다음과 같다. 제주화교는 1909년 이전에 제주로 도래하여 일제강점기 동안 꾸준한 성장을 통해 화교사회를 형성하였으나, 1931년 만보산 사건과 1937년 중일전쟁의 영향으로 화교사회가 거의 붕괴하는 상황에 직면하였다. 그러나 해방이후 화교 자치구의 조직과 운영, 화교소학교 건립을 통해 화교사회를 재건 하였으며, 문화적 정체성을 확보해 나갔다. 이러한 재건활동을 기반으로 피난 등으로 제주에 유입된 내륙화교들을 제주사회에 통합시켰으며 음식업을 중심으로 활발한 경제 활동을 수행할 수 있었다. 이 결과 제주화교 사회는 해방 전의 인구 규모를 능가하며 화교인구가 감소한 다른 중소도시와는 달리 70년대 후반까지 인구가 증가하는 등 활성화된 모습을 보여 주었 다. 또한, 지역문화 행사에 대한 지속적인 참여 등을 통해 지역사회에 융화되기 위해 노력하는 모습을 보여주었다. 이러한 점은 다른 지역화교와 대비되는 제주화교의 독특한 모습이라고 할 수 있다. 향후 연구과제로는 1970년대 후반이후 제주화교의 재이주 동향, 1992년 한중수교 이후 유입된 신화교와 구화교 간의 관계발전 등에 대한 연구라 할 수 있다. The purpose of this paper is to further enrich the life history of Jeju Overseas Chinese(Jeju Hwagyo) by supplementing the limitations of previous studies and examining the reconstruction process of Jeju Overseas Chinese society and the impact of the results on the lives of them after liberation. In addition, when research on Chinese history in Korea is very scarce after liberation, it was intended to expand the horizon of Overseas Chinese history in Korea through this research in the same period. The main fact revealed through the study was that Jeju Chinese formed a Overseas Chinese society through steady growth during Japanese colonial era since they moved to Jeju before 1909, but the Chinese society almost collapsed as it withdrew to China due to the influence of the Sino-Japanese War at the end of Japanese colonial era. However, after liberation, the Jeju Chinese Overseas society was rebuilt through the organization and operation of the Chinese Autonomous District and the opening of the Chinese Primary School, and cultural identity was secured. Based on these reconstruction activities, inland Chinese who flowed into Jeju due to evacuation were able to easily settle in Jeju society, and were able to carry out active economic activities centered on the food industry with existing Jeju Hwagyo. As a result, Jeju Chinese Overseas society showed an active appearance, with its population increasing until the mid-70s. it showed efforts to harmonize with the local community through continuous participation in local cultural events. This point can be said to be a unique appearance of Jeju Overseas Chinese in contrast to other local Overseas Chinese. Future research projects can be said to be studies on the trends and causes of re-migration of Jeju Chinese after the late 1970s, and the relationship between old hwagyo and new hwagyo which flowed into after diplomatic relations between Korea and China in 1992.

Nd:YAG 레이저 충격 피닝에 의한 금속표면의 잔류응력 특성 개선

양세영(Se-Young Yang),최성대(Seong-Dae Choi),전재목(Jea-Mok Jun),공병채(Byeong-Chae Gong) 한국생산제조학회 2010 한국생산제조학회지 Vol.19 No.4

Laser shock peening is useful to improve fatigue characteristic of multiple number of metals and alloys. This process induces a compressive residual stress on the metal surface, and when tensile load is applied, growth of crack is delayed and which changes the characteristic of the metal surface. It is an innovative surface treatment technique for strengthening metals. Specimens of SM45C are used in this study. The effect of an inertial tamping layer on the residual stress field using laser shock peening setup and Nd:YAG laser power is evaluated. Residual stress distribution measured by X-ray diffraction. As a result of this study it can be presented that following condition of Nd:YAG laser power and inertial tamping layer parameters, compressive residual stress is generated on the surface of the SM45C. Results to experimental data indicate that laser shock peening has great potential as a means of improving the mechanical performance of the metal surface.