Plasma Diode Electron Beam Heat Treatment of Cast Iron: Effect of Direct Preheating

강은구,최헌종,민병권,이상조 한국정밀공학회 2017 International Journal of Precision Engineering and Vol.18 No.10

Cast iron is relatively cheap and highly machinable and is thus used for various mechanical parts. However, cast iron (H2 grade) is a high-carbon steel that shows cracks or craters owing to the martensitic transformation during conventional surface heat treatments. In this study, we investigated electron-beam (e-beam)-based direct preheating for preventing the formation of craters and cracks during the heat treatment of cast iron using a plasma diode e-beam. Scanning electron microscopy, X-ray diffraction analysis, energy-dispersive X-ray spectroscopy, and hardness measurements were performed to elucidate the crater and crack formation mechanism. Craters were formed within the graphite phase, owing to the low-melting-point elements and compounds. It was also observed that crack and crater formation was correlated to the distortion of the primary gamma phase, based on a significant decrease in the d-spacings. The direct preheating process resulted in a lower degree of distortion of the gamma phase. As a result, we could achieve a hardness as high as 800 HV without cracks or craters in cast iron, which is a cheap material. Moreover, the results of potentiodynamic polarization tests showed that the corrosion resistance increased after the surface treatment, owing to the removal of the low-melting-point impurities and grain refinement.

The Significance of Contract Law for Efficient Mergers and Acquisitions (M&A) Procedure

강은구 동아시아경상학회 2023 The East Asian Journal of Business Economics Vol.11 No.4

Purpose – This study aims to examine the role of contract law in mergers and acquisitions (M&A) and to examine whether or not contract law is necessary in M&A. The study also discusses how contract law can be utilized in M&A, as well as some of the problems that arise from the use of contracts in this area. Research design, data, and methodology – To minimize bias and errors, this study used only peer-reviewed articles and book excluding internet news articles, conference papers, and dissertations. For a well-organized screen and selection process, the author conducted the extraction procedure thoroughly to eliminate some duplicated resources. Result: This study indicates that complex deals carry a high risk but also have the potential to yield substantial revenue for stakeholders. Thus, contract law is essential to the success of M&A because it helps to define the (1) terms of the transaction, (2) reduces risk, (3) offers legal safeguards, and ensures that the (4) agreement is enforced. Conclusion – This study concludes that an understanding of contract law is essential to the profitable merging of two businesses. The application of contract law provides a mechanism for enforcing the agreement, which can increase the likelihood that the stipulations of the M&A will be satisfied.

경구개에 발생한 말초성 T세포 림프종 1예

강은구,이용만,박계훈,백병준 대한이비인후과학회 2009 대한이비인후과학회지 두경부외과학 Vol.52 No.6

Peripheral T cell neoplasms (PTCNs) comprise a group of uncommon and heterogenous lymphoid malignancies. They are more difficult to diagnose and treat and have a worse prognosis than B cell lymphomas. NK/T cell lymphoma is the most common histologic subtype in the head and neck. Unspecified type is the most common subtype of PTCNs but is not reportedin oral cavity or nasal cavity. We report a case of a perforating palatal ulceras a rare presentation of peripheral T cell lymphoma with a review of literature.

월간 여성 잡지의 유아교육 관계 기사 번석

강은구 중앙대학교 유아교육학과 1994 유아교육학논집 Vol.1994 No.1

Innovative Capability and Its Connection with Worker's Environmental Performance

강은구 한국유통과학회 2022 The Journal of Industrial Distribution & Business( Vol.13 No.7

Purpose: Environmental contamination has lately been seen as a consequence of the rise in environmental challenges brought on by rapid industrial expansion. At this point, the current research asks an important question about what the factors are to motivate employees’ green performance, increasing corporate sustainability. Research design, data and methodology: The current author selected total 19 items to obtain real data and achieve the purpose of this research. For measuring of the causality between the worker’s innovative capability and green performance, the current author used the multiple regression statistical tool using U.S. 215 responses in four industry. Results: The statistical finding definitely indicated that there exists the causal linkage between two key factors (Innovation capability and green performance) as well as the strong direction between two constructs. As a result, the current author could accept all hypotheses, checking no existing the multicollinearity of the present constructs with ‘TOL’ and ‘VIF’ values. Conclusions: The present research concluded that literature and business management scholars and practitioners will benefit from this study's statistical results. Furthermore, rewarding staff creativity, encouraging quick answers to market movements, and incorporating technology into everyday operations are all ways that companies may cultivate an environmental stewardship culture.

경북지역 혁신프로젝트사업

강은구 한국지역고용학회 2018 한국지역고용학회 학술대회 Vol.2018 No.07

공유리더십이 팀 유효성에 미치는 영향에 관한 연구

강은구,이선규 한국인사관리학회 2018 한국인사관리학회 학술대회 발표논문집 Vol.2018 No.1

The purpose of this study is to identify the effects of shared leadership on team performance, team commitment, and team creativity. We also analyze the mediating effects of perceived similarity of team members and the moderating effects of communication types in the relationship between these variables. For this purpose, through the method of literature, we established a research model and Hypothesis was derived. In order to verify the hypothesis, we surveyed middle, small and large enterprises in Daegu and Gyeongbuk area. Also, survey participants were limited to team workers. The results of this study are as follows, First, Shared Leadership has a positive effect on Team’s Performance, Commitment, and Creativity. Second, Perceived Similarity has a partial mediating effect on the relationship between Shared Leadership and Team’s Performance, Commitment, and Creativity. Third, Formal Communication has been revealed to moderate the relationship between shared leadership and team performance. Fourth, Informal Communication has been revealed to moderate the relationship between shared leadership and team commitment, team creativity. These findings show that shared leadership is applied to the team and mechanisms for generating performance. In addition, it will create strategic human resource management to have a flexible organizational structure, and ultimately contribute to the theoretical development of shared leadership.

칼만 필터와 차량 특징 정보를 이용한 중첩된 다중 차량 추적에 관한 연구

강은구,김성동,최기호 한국통신학회 2001 韓國通信學會論文誌 Vol.26 No.4

본 논문은 고정된 카메라를 통해 들어오는 도로연상에서 추적되는 다중 차량들의 겹침(occlusion)발생시 칼만 필터와 차량의 특징정보를 이용하여 개별 차량을 분할하고 추적 가능한 시스템을 제안하고 구현하였다. 다중 차량을 추적할 시 가장 큰 문제점이 되고 있는 차량 겹침을 해결하기 위해 카메라와의 거리를 이용하여 해결하는 방법 3D 모델을 이용하여 해결하는 방법, 겹침 추론 등 차량 겹침을 해결하기 위한 여러 가지 방법들이 제시되고 있다. 그러나 영상에 연속적으로 나타나는 다중 차량의 겹침을 단일 차량으로 인식할 수 는 단점이 있다. 따라서 칼만 필터와 차량의 특징 정보로서 차량의 높이와 넓이의 비, 추적에 사용되는 박스에서 차량과 여백의 비를 이용함으로서 연속적으로 나타날 수 있는 차량 겹침을 분할하고 추적 가능하게 하는 시스템을 구현하고 실험하였다. 본 시스템에서는 256X 256의 크기로 15 frames/sec로 저장된 AVI 파일 형식의 동영상을 사용하여 실험에 이용하였으며, 시내 도로에서의 차량들의 실험 결과 기존의 방법 보다 차량 특징 정보를 이용한 방법이 연속적 겹침에 대한 처리에 우수함을 보였다.

Team Management for Better Performance that Sells to Customers: Aligning the Stars

강은구,황희중 한국유통과학회 2017 유통과학연구 Vol.15 No.7

Purpose - There are several problems that organizations face to make a better team-based system such as free-rider issue, assigned difficult jobs unfairly and bickering between high performers and average performers. The purpose of this study is to provide solutions for practitioners through past academic studies on how organizations can resolve several issues in team management. Ultimately, it would lead to employees as better performers for organization’s profitability and customers’ satisfaction. Research design, data, and methodology - Solution 1 - put employees who have a similar performance ability together into a same team and apply ‘growth’ approach for low performance team. Solution 2 – make a new evaluation system which is balanced between individual’s performance and team’s performance. Solution 3 - monitor thoroughly to diffuse difficult works equally among teams and develop management practice system that may prevent or resolve difficult work-loads for a team or an individual performer. Result - Investigation suggests that organizations may resolve three conflicts which come from team base system. Moreover, the implications of results show that the most important criteria in team management depend on whether performers have a similar ability in the same team and management handles issue of justice and the performance of each employee is evaluated by total team performance evaluation simultaneously. Conclusions - All in all, our recommendation concludes that if three issues are resolved, the lack of trust in team-based system among team members will be missed.

Obesity in Children and Adolescents: 2022 Update of Clinical Practice Guidelines for Obesity by the Korean Society for the Study of Obesity

강은구,홍용희,김재현,정소정,김경곤,함지희,김범택,김은미,박정환,이상열,강지현,이영준 대한비만학회 2024 Journal of obesity & metabolic syndrome Vol.33 No.1

The prevalence of obesity in children and adolescents has been gradually increasing in recent years and has become a major health problem. Childhood obesity can readily progress to adult obesity. It is associated with obesity-related comorbidities, such as type 2 diabetes mellitus, hypertension, obstructive sleep apnea, non-alcoholic fatty liver disease, and the risk factor for cardiovascular disease. It is important to make an accurate assessment of overweight and obesity in children and adolescents with consideration of growth and development. Childhood obesity can then be prevented and treated using an appropriate treatment goal and safe and effective treatment strategies. This article summarizes the clinical practice guidelines for obesity in children and adolescents that are included in the 8th edition of the Clinical Practice Guidelines for Obesity of the Korean Society for the Study of Obesity.