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혁신지향문화와 혁신행동이 데이터기반행정 추진 역량에 미치는 영향: 업무자율성의 매개효과를 중심으로
양형석,조수향,남태우 한국지역정보화학회 2024 한국지역정보화학회지 Vol.27 No.1
최근 들어 정보통신 기술이 급속하게 융합・발전하면서 4차 산업혁명을 주도하고 있으며, 4차 산업혁명의 중요한 화두로서 데이터에 기반한 업무 효율화가 강조되고 있다. 이에, 본 연구에서는 공공조직의 데이터기반행정 추진 역량을 강화하기 위해 구성원들이 어떠한 요소를 중요하게 인식하고 있는지 규명하고자 하였다. 한국행정연구원에서 수행한 ‘클라우드 전환 시대 데이터기반행정에 관한 인식조사’ 자료를 활용하였으며, 위계적 회귀분석과 매개효과분석을 실시하여 결과의 신뢰도를 확보하였다. 분석 결과, 혁신지향문화에 대한 인식, 혁신행동에 대한 인식, 업무자율성에 대한 인식이 긍정적일수록 데이터기반행정 추진 역량에 대해 긍정적인 인식을 보였으며, 업무자율성에 대한 인식은 혁신지향문화 및 혁신행동에 대한 인식과 데이터기반행정 추진 역량에 대한 인식 간의 관계를 유의하게 매개하였다. Recently, information and communication technologies are rapidly converging and developing, leading to the Fourth Industrial Revolution, and data-based work efficiency is being emphasized as an important topic in the the Fourth Industrial Revolution. Accordingly, this study aimed to identify the elements that members perceive as important to enhance the Progress Capacity of public organizations for Data-Based Administration. Data from the ‘Perception Survey on Data-Based Administration in the Cloud Transition Era’ conducted by the Korea Institute of Public Administration were used, and hierarchical regression analysis and mediation effect analysis were conducted to secure the reliability of the results. As a result of the analysis, the more positive the perception of Innovation-Oriented Culture, the perception of Innovative Work Behavior, and the perception of Work Autonomy, the more positive the perception was about the Progress Capacity of Data-Based Administration. In addition, the perception of Work Autonomy significantly mediated the relationship between the perception of Innovation-Oriented Culture and Innovative Work Behavior and the perception of Progress Capacity for Data-Based Administration.
반복주조가 Pd-Ag-Au 도재용 합금의 경도에 미치는 영향
조미향(Mi-Hyang Cho),이광영(Gwang-Young Lee),조수연(Su-Yoen Cho) 대한치과재료학회 2015 대한치과재료학회지 Vol.42 No.4
Dental alloy manufacturers advise against the reuse of previously melted alloy. However, for economic and environmental reasons, dental laboratories often reuse the casting surplus. The purpose of present study is to find out the reason in hardness change of a Pd-Ag-Au-In-Sn metal-ceramic alloy by recasting. Hardness decreased with increase in casting frequency. At the same time, the microstructure of all recasted specimen showed complex microstructural features. The recasted specimens were composed of the matrix and the particle-like structures covered with fine precipitates. The decrease in hardness by recasting was caused by the decrease of nuclei concentration by repeated melting and resultant increase in grain size. The precipitates covered with the particle-like structures showed no microstructural change by the repeated casting up to 5 times. It was indicated that the precipitates were not related to the change in hardness by recasting.
Pd-Ag-Au-In-Sn 도재용 합금의 모의소성 후 계류에 따른 석출 경화
조미향(Mi-Hyang Cho),조수연(Su-Yoen Cho) 대한치과재료학회 2015 대한치과재료학회지 Vol.42 No.2
The aim of present study is to evaluate the changes in hardness of a Pd(Palladium)-Ag(Silver)-Au(Gold)-In(Indium)-Sn(Tin) metal- ceramic alloy by holding after simulated complete firing. In the porcelain firing simulated specimen, the hardness increased by holding at 500~700 ℃. The most effective holding condition for hardening of the Pd-Ag-Au-In-Sn alloy was the holding at 700 ℃ for 10 min. In all specimens, the microstructure was composed of the matrix covered with precipitates and the particle-like structure. The increase in hardness was resulted from the precipitation of the Pd3(In,Sn,Ga) phase with f.c.t. structure in the matrix composed of the Pd-Ag-based phase with f.c.c. structure. The decrease in hardness by prolonged holding up to 50 min at 700 ℃ was resulted from the microstructural coarsening of the precipitates. In the Pd-Ag-Au-In-Sn metal-ceramic alloy, the holding at 700 ℃ for 10 min after simulated complete firing is an effective method for improving hardness without affecting the porcelain superstructure, therefore it is recommended for clinical application.
Pd-Ag-Au계 금속-세라믹 금관용 합금의 모의소성과 반복소성이 경도와 미세구조에 미치는 영향
조수연(Su-Yoen Cho),조미향(Mi-Hyang Cho) 대한치과재료학회 2014 대한치과재료학회지 Vol.41 No.4
The aim of present study was to evaluate the effect of complete firing cycle and rebake on the hardness and microstructure of a Pd-Ag-Au metal-ceramic alloy. In the solution-treated specimen, the matrix was composed of the Pd-Ag-based phase with a face centered cubic structure, and the particlelike structures were composed of the Pd3(In,Sn) phase with a face centered tetragonal structure. And this two-phased microstructure was maintained after complete firing cycle and rebake. The increase in hardness after oxidation treatment was resulted from the grain interior precipitation of the Pd3(In,Sn) phase in the Pd-Ag-based matrix. The decrease in hardness by subsequent firing schedule was resulted from the homogenization of grain interior precipitates and microstructural coarsening of the particle-like structures.
Ag의 함량에 따른 Ag-Pd-In계 합금의 광학적 특성 및 미세구조의 변화
설효정(Hyo-Joung Seol),조수연(Su-Yoen Cho),조미향(Mi-Hyang Cho) 대한치과재료학회 2018 대한치과재료학회지 Vol.45 No.3
In this study, change of optical properties and microstructure of an Ag-Pd-In alloy according to Ag content was investigated. For this purpose, specimen alloys were prepared by adding 0-100 wt.% of Ag to the 50Pd-50In (wt.%) alloy. When the content of Ag was more than 40 wt.%, the color difference with pure gold specimen was increased(p<0.001). L* value increased as the Ag content of the specimen increased, but a* and b* value increased until the addition of 20 wt.% Ag, and then decreased with increasing Ag content(p<0.001). Ag-free specimen was single phase in the as-cast state, but when the content of Ag was more than 20 wt.%, the phase separation occurred and two phases of matrix and dendrite or granular structure were confirmed. The dendrite or granular structure was composed of the InPd phase, and the matrix was composed of the Ag-rich phase. From these results, it can be concluded that the specimens with Ag content of 20-70 wt.% have the Ag-rich matrix which has a high L* value and low a* and b* value, and have the dendrite structure which has a low L* value and high a* and b* value. As the content of Ag increased, the color changed from light yellow to silver white due to the increase in the ratio of the matrix to the dendrite or granular structure.
은이 함유되어있지 않은 Pd-Sn-Zn-Ga계 금속-세라믹 금관용 합금의 소성에 따른 석출경화
설효정(Hy-Joung Seol),이광영(Gwang-Young Lee),조미향(Mi-Hyang Cho),조수연(Su-Yeon Cho),권용훈(Yong-Hoon Kwon),김형일(Hyung-Il Kim) 대한치과재료학회 2011 대한치과재료학회지 Vol.38 No.2
Precipitation hardening in a silver-free PFM alloy of Pd-Sn-Zn-Ga system during porcelain firing process was studied by characterizing the age-hardening behavior and age-hardenability, phase transformation and microstructural changes during aging process, changes in hardness after simulated firing with various cooling rates, changes in hardness and microstructure after simulated complete firing with controlled cooling rate. The age-hardening and softening mechanisms of a silver-free Pd-Sn-Zn-Ga alloy were homogeneous grain-interior precipitation of the GaPd phase in the Pd-rich matrix and the subsequent lamellar-forming grain boundary reaction, respectively. The lamellar structure was composed of the Pd-rich α₁ matrix layer and the GaPd precipitate layer. The maximum harness value was obtained at stage 2 after simulated firing with various cooling rates (quick cooling, stage 0, stage 1, stage 2, stage 3). The increase in hardness value of the solution-treated specimen was not apparent after simulated complete firing with controlled cooling rate (stage 2). The oxide film formed on the surface of the alloy after simulated complete firing with controlled cooling rate, which was mainly composed of Pd and O. The content of Ga and Sn in the oxide film was not apparent after simulated complete firing.