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Terra-Scope - a MEMS-based vertical seismic array
Glaser, Steven D.,Chen, Min,Oberheim, Thomas E. Techno-Press 2006 Smart Structures and Systems, An International Jou Vol.2 No.2
The Terra-Scope system is an affordable 4-D down-hole seismic monitoring system based on independent, microprocessor-controlled sensor Pods. The Pods are nominally 50 mm in diameter, and about 120 mm long. They are expected to cost approximately $6000 each. An internal 16-bit, extremely low power MCU controls all aspects of instrumentation, eight programmable gain amplifiers, and local signal storage. Each Pod measures 3-D acceleration, tilt, azimuth, temperature, and other parametric variables such as pore water pressure and pH. Each Pod communicates over a standard digital bus (RS-485) through a completely web-based GUI interface, and has a power consumption of less than 400 mW. Three-dimensional acceleration is measured by pure digital force-balance MEMS-based accelerometers. These accelerometers have a dynamic range of more than 115 dB and a frequency response from DC to 1000 Hz with a noise floor of less than $30ng_{rms}/{\surd}Hz$. Accelerations above 0.2 g are measured by a second set of MEMS-based accelerometers, giving a full 160 dB dynamic range. This paper describes the system design and the cooperative shared-time scheduler implemented for this project. Restraints accounted for include multiple data streams, integration of multiple free agents, interaction with the asynchronous world, and hardened time stamping of accelerometer data. The prototype of the device is currently undergoing evaluation. The first array will be installed in the spring of 2006.
System identification of soil behavior from vertical seismic arrays
Glaser, Steven D.,Ni, Sheng-Huoo,Ko, Chi-Chih Techno-Press 2008 Smart Structures and Systems, An International Jou Vol.4 No.6
A down hole vertical seismic array is a sequence of instruments installed at various depths in the earth to record the ground motion at multiple points during an earthquake. Numerous studies demonstrate the unique utility of vertical seismic arrays for studying in situ site response and soil behavior. Examples are given of analyses made at two sites to show the value of data from vertical seismic arrays. The sites examined are the Lotung, Taiwan SMART1 array and a new site installed at Jingliao, Taiwan. Details of the installation of the Jingliao array are given. ARX models are theoretically the correct process models for vertical wave propagation in the layered earth, and are used to linearly map deeper sensor input signals to shallower sensor output signals. An example of Event 16 at the Lotung array is given. This same data, when examined in detail with a Bayesian inference model, can also be explained by nonlinear filters yielding commonly accepted soil degradation curves. Results from applying an ARMAX model to data from the Jingliao vertical seismic array are presented. Estimates of inter-transducer soil increment resonant frequency, shear modulus, and damping ratio are presented. The shear modulus varied from 50 to 150 MPa, and damping ratio between 8% and 15%. A new hardware monitoring system - TerraScope - is an affordable 4-D down-hole seismic monitoring system based on independent, microprocessor-controlled sensor Pods. The Pods are nominally 50 mm in diameter, and about 120 mm long. An internal 16-bit micro-controller oversees all aspects of instrumentation, eight programmable gain amplifiers, and local signal storage.
Glaser (Kukartseva) Marina,Thomann Pierre-Emmanuel 한양대학교 아태지역연구센터 2022 Journal of Eurasian Studies Vol.13 No.1
This article examines the Russian project of Greater Eurasia, the reasons for launching such an initiative, and its possible influence on the current regional and global trends in the field of geopolitics, security policy, and relations between Russia and the European Union. The article argues that Greater Eurasia, as a developing geo-economic and geostrategic community, opens up opportunities for Russia and the European project to reset their relationship by creating new zones of mutual development.
Chinese Attitudes toward Korean Unification
Bonnie Glaser,Yun Sun 통일연구원 2015 International journal of korean unification studie Vol.24 No.2
Although China officially supports unification of the Korean Peninsula, it essentially maintains a two Koreas policy. Beijing sustains this approach because even as the burdens and dangers of the status quo on the peninsula increase, it judges that the risks of unification are potentially greater. Nevertheless, China’s growing economic and political clout along with the strengthening of its ties with South Korea are boosting Beijing’s confidence that it can protect Chinese interests regardless of developments on the peninsula. The more permissible environment in recent years regarding discussion of Chinese policy toward the Koreas has engendered a robust debate among Chinese researchers about the potential costs and benefits for China of Korean unification. The ROK and the U.S. should consider ways to influence China’s cost/benefit calculus regarding Korean unification. No single step is likely to alter China’s approach, but an accumulation of measures aimed at easing Chinese fears and reducing the uncertainties associated with unification could have an impact on Chinese thinking and policies over time.