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| 1 | Microstructural evolution during the auaoaliag of art extruded AZ31 msgnium alloy 显示文摘 | Sangbong Yi Heinz-GOnter Brokmeier Dietmar Letzig | 2010 | Journal of Alloys and Compounds2010，506，1： | 1 |
| 2 | 关于日本地方政府现状评估体系的研究-以事务事业评估为主[J]显示文摘 | SangBong | 2005 | 韩国行政研究2005，，14： | 1 |
| 3 | Mechanical anisotropy and deep drawing behavior of AZ31 and ZEI0 magnesium alloy sheets 显示文摘 | Yi Sangbong Bohlen Jan Heinemanna Frank Letzig Dietmar | 2010 | Acta Materialia2010，58，2： | 1 |
| 4 | Effect of rare earth elements on the microstructure and texture development in magnesium–manganese alloys during extrusion显示文摘 | Jan Bohlen Sangbong Yi Dietmar Letzig Karl Ulrich Kainer | 2010 | Materials Science & Engineering A2010，，： | 1 |
| 5 | Grain size effects on deformation twinning in an extruded magnesium alloy tested in compression 显示文摘 | Dobrom Patrik Chmelfk Frantisek Yi Sangbong | 2011 | Scripta Materials2011，65，5： | 1 |
| 6 | Effect of rare earth elements on the microstructure and texture development in magnesium-manganese alloys during extrusion 显示文摘 | Jan Bohlen Yi Sangbong Letzig Dietmar | 2010 | Materi- als Science and Engineering2010，527，26： | 1 |
| 7 | Towards smart farming solutions in the U.S.and South Korea:A comparison of the current status显示文摘Smart farming solutions combine information,data software tools,and technology with the intent to improve agricultural production.While smart farming concepts are well described in the literature,the potential societal impacts of smart farming are less conspicuous.To demonstrate how smart farming solutions could influence future agricultural production,agri-business and rural communities and their constituents,this article compares smart farming approaches and reasons behind the pursuit of smart farming solutions by the U.S.and South Korea.The article compares agricultural assets and productivity among the two countries as well as the technical and societal challenges impacting agricultural production as a basis to understanding the motivations behind and pathways for developing smart farming solutions.In doing so,the article compares some of the technological and social advantages and disadvantages of smart farming,dependending on the choice and implementation of smart farming solutions.The South Korean government has implemented a national policy to establish smart farming communities;a concept that addresses the entire agri-food supply chain.In the U.S.,a national plan to develop smart farming technologies does not exist.However,discrete smart farming solutions driven mainly by competition in the private sector have resulted in high-tech solutions that are advancing smart farming concepts.The differences in approaches and reporting of successes and failures between the two countries could facilitate the rate of evolution of successful smart farming solutions,and moreover,could provide pathways to facilitate sustainable development goals in developing countries where smart farming activities are currently underway. | Susan A.O’Shaughnessy Minyoung Kim Sangbong Lee Youngjin Kim Heetae Kim John Shekailo | 2021 | Geography and Sustainability2021，2，4： | 1 |
| 8 | An improved full bridge zero - voltage - transition PWM DC / DC converters with zero- voltage/zero-current switch of the auxiliary switch 显示文摘 | LEE Dongyun LEE Byoungkuk YOO Sangbong | 2000 | IEEE on IA2000，，2： | 1 |
| 9 | Plastic instability and texture modification in extruded Mg-Mn-Nd alloy显示文摘Even though Mg alloys containing Mn and rare earth elements lead to higher ductility and lower yield asymmetry due to the weak texture after extrusion, plastic instability, commonly known as the Portevin–Le Chatelier(PLC) effect, causes unexpected fragility in the service environment. In the present study, the PLC phenomenon and texture development during the deformation of Mg-Mn and Mg-Mn-Nd extruded alloys were investigated under various temperatures and strain rates. The addition of Nd causes not only texture weakening but also severe PLC phenomenon. The PLC phenomenon was significantly affected by the temperatures and the strain rates, which causes a difference in mechanical properties and development of texture. In the conditions of high temperature and low strain rate, the strength increased while the elongation decreased significantly, and obvious PLC phenomenon with severe serration and negative strain rate sensitivity. The initial texture was maintained even after deformation only under severe PLC conditions, and this is due to the restriction of basal slip and suppression of lattice rotation in PLC conditions. The series of results indicate that the PLC phenomenon causes a reduction of formability even at high temperature. | Sang Kyu Woo Risheng Pei Talal Al-Samman Dietmar Letzig Sangbong Yi | 2022 | Journal of Magnesium and Alloys2022，10，1： | 0 |
| 10 | Effects of Ca and Nd addition on plastic instability in extruded Mg-Mn alloy deformed under various conditions显示文摘Plastic instability, called Portevin-Le-Chatelier(PLC) effect, manifests itself as an unstable plastic flow during tensile tests of structural materials. This phenomenon has a strong influence on diverse properties, leading to unexpected vulnerabilities in the service environment.Among various magnesium-based alloys, PLC phenomenon is most prominently observed in the Mg-Mn-Nd alloy under elevated temperature and low strain rate conditions. An important aim of the study is to clarify and compare the significance of the RE and Ca addition, which are known to cause a formation of a largely weakened non-basal type texture, in the occurrence of plastic instability. Due to the PLC phenomenon, there is a risk of weakening texture and formability improvement by the addition of RE and Ca elements in Mg alloys. Based on the understanding of the role of Nd to the PLC phenomenon in Mg-Mn alloy identified in previous studies, the PLC characteristics according to alloying elements and deformation conditions were compared and analyzed. To identify the micromechanical mechanisms of the PLC phenomenon, varies in the microstructure and mechanical properties during deformation of Mg-Mn binary and Ca or Nd-containing Mg-Mn-based ternary alloys in various conditions were systemically analyzed. The addition of Ca did not show a marked PLC effect due to the formation of low number density Mn-Ca and Ca-Ca solute clusters and an unbalanced Mn:Ca ratio. In contrast, the addition of Nd leads to the formation of a higher number density of Nd-Nd and Mn-Nd solute clusters than that of Ca-Ca and Mn-Ca solute clusters of the Mg-Mn-Ca alloy, resulting in a stable solute-dislocation interaction atmosphere under specific ranges of deformation temperature and strain rate. The deformation in the regime of PLC phenomenon, results in a decrease in ductility and an increase in strength, despite deformation at elevated temperatures with maintaining the weakened texture. | Sang Kyu Woo Risheng Pei Talal Al-Samman Dietmar Letzig Sangbong Yi | 2023 | Journal of Magnesium and Alloys2023，11，2： | 0 |
| 11 | Solute drag-controlled grain growth in magnesium investigated by quasi in-situ orientation mapping and level-set simulations显示文摘Critical properties of metallic materials,such as the yield stress,corrosion resistance and ductility depend on the microstructure and its grain size and size distribution.Solute atoms that favorably segregate to grain boundaries produce a pinning atmosphere that exerts a drag pressure on the boundary motion,which strongly affects the grain growth behavior during annealing.In the current work,the characteristics of grain growth in an annealed Mg-1 wt.%Mn-1 wt.%Nd magnesium alloy were investigated by advanced experimental and modeling techniques.Systematic quasi in-situ orientation mappings with a scanning electron microscope were performed to track the evolution of local and global microstructural characteristics as a function of annealing time.Solute segregation at targeted grain boundaries was measured using three-dimensional atom probe tomography.Level-set computer simulations were carried with different setups of driving forces to explore their contribution to the microstructure development with and without solute drag.The results showed that the favorable growth advantage for some grains leading to a transient stage of abnormal grain growth is controlled by several drivers with varying importance at different stages of annealing.For longer annealing times,residual dislocation density gradients between large and smaller grains are no longer important,which leads to microstructure stability due to predominant solute drag.Local fluctuations in residual dislocation energy and solute concentration near grain boundaries cause different boundary segments to migrate at different rates,which affects the average growth rate of large grains and their evolved shape. | Risheng Pei Yujun Zhao Muhammad Zubair Sangbong Yi Talal Al-Samman | 2023 | Journal of Magnesium and Alloys2023，11，7： | 0 |
| 12 | Influence of Ca addition on the dynamic and static recrystallization behavior of direct extruded flat profiles of Mg-Y-Zn alloy显示文摘This paper investigates the influence of addition of Ca in a Y-Zn-containing magnesium alloy on the dynamic and static recrystallization behaviors and reveals the formation mechanism of the quadrupole texture during thermomechanical processing. Direct extrusion of flat bands has been conducted at various process conditions to study the difference between the two alloys WZ10 and WZX100 in terms of microstructure and texture development. It can be shown that, Ca addition promotes the DRX of WZ10 alloy. During additional heat treatment,the absence of Y segregation at the grain boundaries and the associated lack of solute drag to the boundary mobility leads to a pronounced grain growth during SRX in WZX100 alloy. Furthermore, it is shown that the addition of Ca to Y-Zn is not beneficial in terms of formability.It is demonstrated that alloying elements can have different effects depending on the recrystallization mechanisms. Partially recrystallized microstructure is a prerequisite at the as-extruded status to form the quadrupole texture and during subsequent annealing, which stands for high formability. | Maria Nienaber Jan Bohlen Sangbong Yi Gerrit Kurz Karl Ulrich Kainer Dietmar Letzig | 2023 | Journal of Magnesium and Alloys2023，11，10： | 0 |
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