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기업간 관계요인이 협업적 IT 활동과 기업성과에 미치는 영향
장시영,최영진 한국경영과학회 2006 經營 科學 Vol.23 No.3
With the diffusion of the Internet, firms try to electronically collaborate with their partners in order to cut costs and gain profits. This electronic partnership, called ‘Collaborative IT' is quite popular between large purchase enterprises and smalltomedium sized subcontractors. This study investigates such relations. This study proposes three groups of research variables - interorganizational relationship, collaborative IT activity, and firm performance. The interorganizational relationship consists of trust, commitment, and asymmetry of commitment. Collaborative IT activity is composed of information sharing and workflow integration. The ultimate dependent variable is firm performance. It is hypothesized that the relationship factors influence the level of collaborative IT activity, while the latter in turn affects the firm performance. The relationship factors may also directly affect the dependent variable. In addition, collaborative IT motive, as a moderating variable, may influence the causal relationship. By means of survey, one hundred and eightytwo responses were obtained. Most sample companies are smallsized, in the manufacturing sector. The analysis of data reveals that both trust and commitment positively affects the level of collaborative IT activity, while asymmetry of commitment has negative effects. The workflow integration is significantly related with firm performance. Information sharing, however, has no significant effects. Furthermore, asymmetry of commitment shows reverse relationship with firm performance. Collaborative IT motive works as a moderating variable between information sharing and firm performance. Finally, workflow integration is believed to mediate between relationship factors and firm performance.
플라즈마 전해 산화처리한 시효경화 Mg-Al 합금 피막의 기계적 및 전기화학적 특성
장시영,김예림,김양도,Chang, Si-Young,Kim, Ye-Lim,Kim, Yang-Do 한국재료학회 2007 한국재료학회지 Vol.17 No.12
Plasma electrolytic oxidation (PEO) treatment was performed on cast Mg-6 wt%Al alloy solution-treated at 693K for 16h and aged at 498K. The surface roughness, thickness, micro-hardness, wear and corrosion properties of coatings on solution-treated and aged Mg-6 wt%Al alloy were investigated. The coatings on aged Mg-6 wt%Al alloy had thinner layer and lower micro-hardness and wear resistance than the solution-treated Mg-6 wt%Al alloy. As the aging time increased, the thickness of coatings decreased while the surface roughness was almost no changed. In addition, the micro-hardness and wear property of coatings decreased with increasing the aging time unlike the uncoated Mg-6 wt%Al alloy showing the peak micro-hardness and the best wear property after aging for 16 h. However, the coatings on Mg-6 wt%Al alloy peak-aged for 16h revealed the best corrosion resistance in 3.5% NaCl solution, which was explained based on the microstructural characteristics.
도전받는 미국의 헤게모니: 중・러의 도전과 진영 형성에 따른 신냉전 가능성
장시영,남궁영 한국세계지역학회 2023 世界地域硏究論叢 Vol.41 No.1
오늘날 미국의 단극시대는 중국과 러시아로부터 거센 도전을 받고 있다. 글로벌 차원에서 미・중・러가 차지하는 영향력을 감안할 때 이들 간의 갈등은 국제체제 안정을 위협하면서 신냉전의 가능성을 고조시키고 있다. 중국과 러시아는 각각 세계 2위의 경제력과 군사력을 바탕으로 자신이 주된 영향력을 행사하는 세력권 형성에 나서고 있다. 이렇게 형성된세력권은 유라시아와 인도・태평양을 아우르며, 정치・경제・군사・안보적인 형태를 보인다. 무엇보다 중・러는 국제문제 영역에서 미국과의 갈등이 가열되면서 미국에 대한 대항력을높이고, 미국 주도의 국제질서를 대체하고자 상하이협력기구와 브릭스 등과 같이 양국이주도하는 세력권의 영향력 확대에 힘을 합치고 있다. 이러한 중・러의 움직임에 대해 미국은정치・경제・외교 등 가용한 수단을 활용하면서 ‘같은 생각을 가진 파트너’인 대서양동맹과태평양동맹으로 대응하고 있다. 이처럼 ‘중・러의 현존 질서에 대한 도전’과 ‘미국의 중・러부상 저지’ 구도가 명확해지면서 세계는 신냉전을 목전에 두게 되었다.
장시영,이두형,김보식,김택수,송요승,김성호,이찬복 대한금속·재료학회 2009 METALS AND MATERIALS International Vol.15 No.5
Mg-6 wt.%Al-1 wt.%Zn alloy powders were produced by gas atomization, and subsequently compacted and sintered under various conditions of temperature, time, and pressure. The bulk Mg-6 wt.%Al-1 wt.%Zn alloy was coated by the plasma electrolytic oxidation (PEO) method. The optimum condition of compaction and sintering for PEO coatings was established based on the investigation of microstructure, microhardness, and corrosion properties of coatings which were compared to those of cast Mg-6 wt.%Al alloy. The coatings on Mg-6 wt.%Al and Mg-6 wt.%Al-1 wt.%Zn alloys consisted of MgO, MgAl2O4, and Mg2SiO4. The Mg-6 wt.%Al-1 wt.%Zn alloy compacted at room temperature for 10 min and sintered at 893 K for 3 h showed the most porous and nonuniform coating layer because the coatings had grown through grain boundaries that resulted from poor bonding between powder particles in the substrate. However, the coated Mg-6 wt.%Al-1 wt.%Zn alloy hot-compacted at 593 K for 10 min had the thickest coating layer and the highest microhardness. In addition, it demonstrated the best corrosion resistance as verified by polarization curves in 3.5% NaCl solution. Mg-6 wt.%Al-1 wt.%Zn alloy powders were produced by gas atomization, and subsequently compacted and sintered under various conditions of temperature, time, and pressure. The bulk Mg-6 wt.%Al-1 wt.%Zn alloy was coated by the plasma electrolytic oxidation (PEO) method. The optimum condition of compaction and sintering for PEO coatings was established based on the investigation of microstructure, microhardness, and corrosion properties of coatings which were compared to those of cast Mg-6 wt.%Al alloy. The coatings on Mg-6 wt.%Al and Mg-6 wt.%Al-1 wt.%Zn alloys consisted of MgO, MgAl2O4, and Mg2SiO4. The Mg-6 wt.%Al-1 wt.%Zn alloy compacted at room temperature for 10 min and sintered at 893 K for 3 h showed the most porous and nonuniform coating layer because the coatings had grown through grain boundaries that resulted from poor bonding between powder particles in the substrate. However, the coated Mg-6 wt.%Al-1 wt.%Zn alloy hot-compacted at 593 K for 10 min had the thickest coating layer and the highest microhardness. In addition, it demonstrated the best corrosion resistance as verified by polarization curves in 3.5% NaCl solution.
방사선량의 측정, 평가에서 선량당량(dose equivalent)과 등가선량(equivalent dose)의 정의 및 차이
장시영 대한방사선 방어학회 1993 방사선방어학회지 Vol.18 No.1
국제방사선어위윈회(ICRP)는 최근의 권고 60(1990)에서 이전의 권고 26(1976)에는 없었던 새로운 용어들을 도입하였다. 이중에서도 동 위원회는 지금까지 사용되어왔던 국제방사선단위 및 측정위원회(ICRU) 개념의 "선량당량(dose equivalent)"을 대체하는 용어로 "등가선량(equivalent dose)"을 새로 정의하여 방사선방어 프로그램에의 적용을 권고하고 있다. 그러나 한편 동 위원회는 선량 당량이라는 용어도 여전히 채택하고 있기 때문에 경우에 따라 두 양의 사용시 불필요한 혼동을 불러 일으킬 수가 있다. 따라서 본 해설문에서는 방사선 방어, 관리 및 측정분야 종사자들의 이해를 돕기 위하여 두 양의 정의와 사용상의 차이점에 대하여 정리하였다. It its recent recommendation No. 60(1990), ICRP has newly introduced several terminology which had not existed in its prior recommendation No. 26(1977). Of those, a newly defined quantity “Equivalent Dose” replacing the "Dose Equivalent" of the ICRU concept has been recommended to be adopted in the radiation protection programme. However, since the committee still uses the “Dose Equivalent” and “Equivalent Dose” in its several publications, it is likely to provoke unnecessary confusions and misuses in applying these two quantities. In this paper were described the definition and difference between these two quantities to help in understanding of these two quantities among the person involved in the radiation protection activities.