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RISS 인기검색어
- 검색키워드
- 저자 : Gebremedhin, Girma Altaye (검색결과 2 건)
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Design and Implementation of Acoustic Scanner for Non-Destructive Testing Application
GEBREMEDHIN YONATAN ATAKLTI 부경대학교 2021 국내석사
Acoustic scanners refer to scanning a sample using ultrasound waves. Due to the nature and capability of sound to go through different materials and in return exhibits distinct feedback as it travels through a different medium, ultrasound stands out in detecting and identifying defects in a non-destructive way. In this research work, the principles of Hilbert transformation along with the gray color contour mechanism is used for data acquisition, Process, and image formation. In order to get the expected result LabVIEW based motor control, scanning function blocks are constructed. For ease of user (inspection personnel), the end-user graphical user interface is developed. System-level development and integration is achieved by using an immersion transducer, Motion control, and OHlabs pulser receiver. Encoder signal is collected using ATmega processor for synchronized tasking between motor driver and pulser receiver as well as National Instrument (NI) based digital oscilloscope. As a result, top surface scanning is conducted, and encouraging output is observed. However, for an advanced and precise result, the writer of this paper believes that further study and detailed work are needed.
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Gebremedhin, Girma Altaye ProQuest Dissertations & Theses Regent University 2023 해외박사(DDOD)
The identity quest has intensified globally and locally (Friedman, 2000). The issues relating to identity vary from one context to another. In some western countries, sexual and gender identity-related issues have become critical (Carr, 2010). In the Ethiopian context, issues like ethnicity, language, and traditional religion have become the centerpiece of the sociopolitical life of Ethiopians (Zewde, 2004). Evangelical leaders are not exempt from these issues. The intensified identity quest makes balancing social identity and Christian identity a daily struggle for many evangelical leaders. This study intended to answer three questions: What is the proper balance between social and evangelical Christian identity in the Ethiopian context? How do exemplar leaders maintain the balance between the multiple identities they have? And how do exemplar Christian leaders manage to keep their Christian identity to be their core identity? Applying the qualitative case study method, framed by social identity theory and the related social categorization theory, and interviewing 18 exemplar leaders from the evangelical community in Ethiopia, successful principles were drawn. The study confirmed that balancing social identity and Christianity identity is a daily struggle for evangelical Christian leaders in Ethiopia. The study also revealed the growing importance of identity in leadership. Nicholson and Carrol (2013) concluded that the global identity quest resurfaced identity as an essential dimension of leadership. The findings of this study reveal that Christian leadership has to pay due attention to the issue of identity. One can argue that developing skills for balancing social identity and Christian identity has become crucial for effectiveness in Christian leadership. This study revealed some fundamental principles for balancing social and Christian identity, which are discussed.
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