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Gain Based Delay Balancing in the Deep Submicron Era
Ryusuke EGAWA,Jubee TADA,Hiroaki KOBAYASHI,Gensuke GOTO 대한전자공학회 2008 ITC-CSCC :International Technical Conference on Ci Vol.2008 No.7
This paper presents a novel technique to balance the delays in a combinational logic circuit for an equal delay circuit design. The delay balancing technique relies on a gain based delay model and the availability of a continuous size delay elements library. Based on the concept of logical effort in very large scale integrated circuits in the deep submicron era, our proposed technique attempts to minimize a delay difference of combinational logic circuits. Delay balancing tools based on our proposal are developed, and the effectiveness of tools is evaluated. Experimental results show that our proposal achieves 9.96% delay variations on average in combinational logic circuits.
The Importance of Quantitatively Comprehending the Advancement of Reconstruction following Disasters
Akio Egawa 계명대학교 사회과학연구소 2016 한국사회과학연구 Vol.35 No.1
This paper discusses how important it is to quantitatively measure the severity of the damage caused by a serious natural disaster, and the state of restoration and reconstruction after the devastation has occurred. Efforts for quantitatively understanding the state of restoration were not observed in the government sector, even after the Great East Japan Earthquake had occurred. A private research institute established its indices measuring the state of restoration, but there was no visible evidence that government agencies had utilised them for policymaking or for policy assessment. Promptly revising the checklist of statistics that look at the major concerns of disaster victims is necessary as restoration proceeds and government policy delivery becomes more focused on the reconstruction of cities. This paper presents a possible direction for the revision of existing methods of measurement. Three strategies for improvement of the government’s policymaking methods can be identified. (1) A new index suitable for measuring the state of reconstruction at a prefectural level will need to be created in the current stage. (2) A government policy framework for utilising the index should be systematically established as a practice of the EBP. (3) The government should make a business continuation plan for statistical work, and develop guidelines for the treatment and generation of necessary statistics before the next severe disaster occurs, to ensure that the provision of data is therefore rapid and smooth.
Kosuke Egawa,Daekyo Cheong,Shigeru Otoh 한국지질과학협의회 2006 Geosciences Journal Vol.10 No.3
The Homyeong Fault on the Yecheon Shear Zone isnewly defined and described in the northwestern part of NorthGyeongsang Province, South Korea. In the study area, the base-ment rocks consist of the Precambrian rocks and Jurassic granitoid,and are dextrally deformed by the Jurassic Yecheon Shear Zone tothe north of the Cretaceous Gyeongsang Supergroup in a ductilethe Sindong Group, the lowest part of the Gyeongsang Supergroup.The Homyeong Fault runs on the Yecheon Shear Zone, and ismarked by cataclasite that contains mylonite fragments originatingfrom the mylonitic rocks of the Yecheon Shear Zone and that showssinistral sense of shear with normal-fault component dipping bas-inward, which indicates reactivation of the Yecheon Shear Zone.The conglomerates of the northern part of the Sindong Group usuallycontain the gravels of granite, quartzite, blackish quartzite, mylo-nite, ultramylonite, and mudstone. Petrological similarity betweenthese gravels and the basement rocks sugests that most of theits vicinity. Considering the Korean Cretaceous basins mostlyformed by sinistral reactivation of the pre-existing shear zones, itcan be judged that the reactivation of the Yecheon Shear Zonecaused the basement rocks nearby the Homyeong Fault, or theYecheon Shear Zone and its vicinity, to be deposited as the gravelsto the Nagdong Trough where the Sindong Group was filled on thesouth of the fault. This gives new proposals that the HomyeongFault had played a role as a northern boundary fault of the NagdongTrough and also that the inversion tectonics from Jurassic dextral toCretaceous sinistral motions, observed in the eastern margin of Asia,had an effect on the formation of the Nagdong Trough.