• Journal of the Korean Society for Precision Engineering
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• v.15 no.10
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• pp.113-119
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• 1998

Ship structures and aircraft structures are consisted of thin sheet alloy, so it is very important to understand the characteristics of fatigue crack propagation of that material and to establish the data base. The data for fatigue crack propagation behavior scatter very much even under identical experimental conditions with constant loading. The behavior of fatigue crack propagation under regular and irregular cyclic loadings is known to be highly affected by complicated factors such as plastic zone developed at the vicinity of crack tip and reduction of cross sectional area. In this paper, the controlled stress amplitude and overload fatigue crack propagation tests have been conducted to investigate the effect of varying factors such as plastic zone size near the crack tip and area reduction factor (AF) on the fatigue crack propagation behavior A better simulation of fatigue crack propagation behavior is found to be obtainable by using Wheeler and Willenborg models with AF effect.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.27 no.12
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• pp.2004-2010
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• 2003

Fracture life and crack retardation behavior were examined experimentally using CT specimens of aluminum alloy 5083. Crack retardation life and fracture life were a wide difference. between 0.8 and 0.6 in proportion to ratio of load reduction. The wheeler model retardation parameter was used successfully to predict crack growth behavior. By using a crack propagation rule, prediction of fracture life can be evaluated quantitatively. A statistical approach based on Weibull distribution was applied to the test data to evaluate the dispersion in the retardation life and fracture life by the change of load reduction.

• Proceedings of the Korea Contents Association Conference
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• 2019.05a
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• pp.303-304
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• 2019

브랜드 아이덴티티는 브랜드 인지도를 강화하고 다른 브랜드와 차이를 극대화하고 브랜드 자산을 창출하는 중요한 방법이다. 그러나 통일된 브랜드 아이덴티티 시스템 모델이 없는 상황은 브랜드 아이덴티티 개발에 큰 어려움을 가져왔다. 본 연구에서는 먼저 브랜드 아이덴티티의 개념을 고찰하였다. 그다음 아커(David A.Aaker), 손일권, 휠러(Wheeler) 세 학자들이 브랜드아이덴티티 시스템에 대한 관점을 분석하였다. 마지막으로 새로운 종합적 브랜드 아이덴티티 시스템을 추출하였다.

• The Journal of the Korea institute of electronic communication sciences
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• v.19 no.1
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• pp.197-208
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• 2024

In today's era, where internet technology and culture are advancing rapidly, the importance of systematic internet ethics education has been underscored to address the insufficient levels of internet ethics among college students. This research primarily focused on assessing the level of internet ethics among college students, who represent a significant proportion of internet users. The innovative Flip Learning teaching method and the introduction of the Wheeler Model, along with the application of frequency measurement theory, allowed us to explore ways to maximize the effectiveness of the education. It was confirmed that students who received internet ethics education demonstrated improved levels of ethics. This study concluded that significant progress has been made in systematizing and effectively promoting internet ethics education. It also proposed the need for systematic ethics education and provided future directions for improving internet ethics education.