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김창대(Changdae Kim),김석재(Seokjae Kim),여권구(Gyunkoo Yeo),류명석(Myungseok Lyu) 한국자동차공학회 2000 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
To meet future U.S. & European NOx emission standards, it is essential to develop catalyst technology that will reduce NOx emission in addition to the other three pollutants(HC, CO, Paticulate). Two materials that attracted great attention as De-NOx catalysts are the ZSM-5 and BaO contained the commercial DOC. The manufactured several catalysts showed the NOx conversion of about 20-28% but the temperature window of those was narrow as 300~400°C. In case of a general diesel passenger car, engine outlet gas temperature is lower than 250°C under ECE mode. Finally, a new low temperature lean NOx catalyst will be described. In this paper, the possibility of the ZSM-5 and BaO contained the commercial DOC under diesel engine conditions as the 4-way catalyst was investigated
김창대(Changdae Kim),권충일(Choongil Kwon),김석재(Seokjae Kim),여권구(Gwonkoo Yeo) 한국자동차공학회 2002 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2002 No.5_1
To meet future EURO-III, IV emission standards, it is essential to develop catalyst technology that will reduce diesel engine exhaust gases. In this study, deactivation of diesel oxidation catalyst used in fleet vehicle test was mainly investigated To conform the surface characterization of catalyst, BET, IC & CO chemisorption were used.<br/> The causes of deactivation of a diesel catalyst were several but the main factors were sulfur poisoning, carbon coking & Pt sintering among them. Therefore, the LOT of an endurance sample was increased higher than thai of a fresh Especially, the change of pore diameter & volume by sulfur was observed.
김창대(Changdae Kim) 대한성서공회 2015 성경원문연구 Vol.- No.37
This study has attempted to elucidate the theological significance of Jeremiah’s new covenant with regard to the people in the Kingdom of God. The thesis is that the new covenant of Jeremiah seeks to make God’s people in the eschaton the ones that will actualize the ideal of the kingly priests as suggested in the Mosaic Covenant. In making a case for this, this study proposes that the new covenant has, among other theological meanings, the sense of consummating the kingdom of God by making God’s people kingly priests who practice justice and righteousness. In this attempt, our chief attention has been devoted to analyzing the text of Jeremiah 33:14-26 by using the method of textlinguistics. The hermeneutical method of textlinguistics is basically text-oriented in nature, with the assumption that the meanings of a text is embedded in the text when the author tries to convey his intentions to his reader (or audience) through the text. In this method, the intended meanings of a text are culled out from the view point of grammatical cohesion and semantic (or thematic) coherence. The method of textlinguistics also has its concern on how the author impacts the reader in such a way that the reader should respond to the intended meanings of the text. In this respect, a trend in this method focuses its attention on the structures of literary units through which the author arranges his emphases in order to facilitate the reader’s understanding of the communicative effects of the text. On the basis of the method of textlinguistics, this study pays its attention to the literary structure of Jeremiah 33:14-26, with the result of arguing that this unit forms a thematic peak in the context of Jeremiah 30-33. Furthermore, our textlinguistic analysis lends credence to the notion that the reference to Davidic descendants and Levites in this unit implies that in the kingdom of God, the people will be made kings and priests. In conclusion, from the above observations, it is clear that this way of making an exegesis of a text enhances our understanding of the unified relation between the Old and New Testaments from the perspective of the new covenant. The new covenant of the Old Testament connotes the making of God’s people into kingly priests, which is explicitly announced in the New Testament.
GVTS: Global Virtual Time Fair Scheduling to Support Strict Fairness on Many Cores
Kim, Changdae,Choi, Seungbeom,Huh, Jaehyuk IEEE 2019 IEEE transactions on parallel and distributed syst Vol.30 No.1
<P>Proportional fairness in CPU scheduling has been widely adopted to fairly distribute CPU shares corresponding to their weights. With the emergence of cloud environments, the proportionally fair scheduling has been extended to groups of threads or nested groups to support virtual machines or containers. Such proportional fairness has been supported by popular schedulers, such as Linux Completely Fair Scheduler (CFS) through virtual time scheduling. However, CFS, with a distributed runqueue per CPU, implements the virtual time scheduling <I>locally</I>. Across different queues, the virtual times of threads are not strictly maintained to avoid potential scalability bottlenecks. The uneven fluctuation of CPU shares caused by the limitations of CFS not only violates the fairness support for CPU assignments, but also significantly increases the tail latencies of latency-sensitive applications. To mitigate the limitations of CFS, this paper proposes a <I>global virtual-time fair scheduler (GVTS)</I>, which enforces global virtual time fairness for threads and thread groups, even if they run across many physical cores. The new scheduler employs the hierarchical enforcement of target virtual time to enhance the scalability of schedulers, which is aware of the topology of CPU organization. We implemented GVTS in Linux kernel 4.6.4 with several optimizations to provide global virtual time efficiently. Our experimental results show that GVTS can almost eliminate the fairness violation of CFS for both non-grouped and grouped executions. Furthermore, GVTS can curtail the tail latency when latency-sensitive applications are co-running with batch tasks.</P>