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공간 균일 오차 최소화가 가능한 위상 시프팅 알고리즘을 통한 광학 두께 변동량 측정
배원준(Wonjun Bae),김양진(Yangjin Kim) 대한기계학회 2019 대한기계학회 춘추학술대회 Vol.2019 No.11
Wavelength-tuning interferometry is an effective means of detecting the intensity signals necessary to obtain thickness information, particularly the optical thickness variation of transparent plates. The phase-shift error caused by the non-linearity of a phase-shift can lead to spatially uniform error. When the absolute optical thickness is measured, this could be a significant error source. In this study, we developed a new 19-sample phase-shifting algorithm that can suppress spatially uniform error and harmonic components up to the sixth order. Utilizing the Taylor expansion and symmetric/asymmetric properties, we created a new sampling window. The absence of an equation is solved by adjusting the first and second value of sampling window. Finally, the characteristics of the new 19-sample phase-shifting algorithm are shown by analyzing the Fourier transform of sampling functions, phase-dependent measurement errors, and the root mean square (RMS) error.
전자정부사업 역량강화 연수의 미시적 효과 : 나이지리아 전자정부 사업 사례연구
배원준(Wonjun Bae),장우찬(Woochan Chang) 한국국제협력단 2019 국제개발협력 Vol.14 No.2
본 연구는 나이지리아 전자정부 역량강화사업의 연수과정을 소재로, 역량강화 연수가 참가자 개인에 미치는 영향과 전자정부 사업의 목표인 업무 재설계(Government Process Re-Engineering)를 달성하는 데 필요한 조건을 확인하였다. Kirkpatrick(1994)의 이론에 따라 개인의 교육훈련 효과를 (1) 교육 과정에 대한 만족도, (2) 교육을 통해 얻게 된 기능, 태도 또는 지식, (3) 실제 일어난 행동 변화, 즉 교육장에서 배운 지식의 현업 활용도, (4) 교육과정 참가로 인해 교육 참가자가 창출하는 조직 차원의 성과로 나누어 보았으며, 맥니마 분석을 통해 연수과정이 참가자의 자기효능감을 유의미하게 증대시키는 것을 확인했다. 다중회귀분석을 활용해 현업 활용도의 증대요인을 분석한 결과, 부처의 정보화 수준이 가장 중요한 것으로 드러났으며, 이는 초점집단면접을 통해서도 확인되었다. This study aimed to assess the impact of an e-government training on individuals and to identify the conditions required for the training to achieve re-engineering of the government process, which is the objective of the e-government projects. We focused on the case of “Capacity Building of e-Government in Nigeria” by the Korea International Cooperation Agency. Adopting the theory of Kirkpatrick (1994), we collected and analyzed data by gauging (1) satisfaction, (2) knowledge, skills, or attitudes, (3) actual transfer or implementation, and (4) change at the organizational level derived from the training. We confirmed through a McNemar Test that the training improved the self-efficacy of the participants to a significant extent. By correlation and multivariate regression analyses, we found that the informatization level of the department is the most important factor in the training transfer.
금속복합재 TiC-SUS431을 사용한 공작기계 주축 열변형 억제에 대한 연구
서지원(Jiwon Seo),배원준(Wonjun Bae),김성태(Sungtae Kim),김양진(Yangjin Kim),이상관(Sangkwan Lee) 대한기계학회 2019 대한기계학회 춘추학술대회 Vol.2019 No.11
The thermal deformation of spindle is substantial error source in machine tool. A fundamental solution to suppress this thermal error is to replace conventional material of the spindle with an advanced material; the metal composite TiCSUS431 has satisfactory machinability, wear resistance, and oxidation resistance to this end. The experiment conducted in this paper confirmed the superb thermal properties of the TiC-SUS431 composite, including a uniform thermal diffusivity and low thermal expansion coefficient. Based on these properties, we conducted a finite element analysis (FEA) of a spindle using TiC-SUS431, SUS431, as well as the existing spindle material, GC300. The FEA indicates that thermal deformation of the spindle with TiC-SUS431 is minimal compared to the spindles with GC300 and SUS431. This would suggest the possibility of using TiC-SUS431 composite as an alternative material for spindles, as it has a surpassing capability in reducing thermal strain.