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Masahiko Ozaki / Professor / Division of Environmental Studies
Department of Ocean Technology, Policy, and Environment / / CCS(CO2 Capture and Storage), Subsea systems, Riser, Mooring, Deepwater ocean drilling, Logistics planning for ocean development, Ocean industry
http://aquacage3.k.u-tokyo.ac.jp/index.html

Career Summary
1978: Graduated from Faculty of Engineering, University of Tokyo
1983: Doctor of Engineering from University of Tokyo
1983-1989: Hiroshima R&D Center, Mitsubishi Heavy Industries, Ltd.
1989-2007: Nagasaki R&D Center, Mitsubishi Heavy Industries, Ltd.
2007-2008: Center for Deep Earth Exploration (CDEX), Japan Agency for Marine-Earth Science and Technology (JAMSTEC)
2008: Professor, University of Tokyo
Educational Activities
Graduate school: Ocean Development Systems, Ocean Industry Development, Special Lecture on Ocean Technology, Policy, and Environment I, Ocean Fluid-Structure Dynamics, Design of Ocean Systems
Undergraduate: Applied Fluid Mechanics, Exercise on Mechanics
Research Activities
CCS:
Deep reduction of CO2 emissions is required to mitigate the coming climate change. However, economic society is dependent upon the usage of coal, oil and natural gas, all of which are associated with CO2 emissions, and it takes time to switch to a low carbon energy system. Carbon Capture and Storage (CCS) is the process of separating CO2 from the atmosphere by injecting CO2 produced by fossil fuel underground or in the deep ocean.
Ozaki Lab has developed a ship-based offshore CCS system for the smooth realization and commercialization of CCS in Japan and is proceeding with engineering research on the implementation and planning of a large-scale demonstration test in collaboration with Government and Industry.
Recent research topics include:
1) Logistics system planning with robustness for CO2 marine transportation that takes into account changes of ocean weather
2) Technological assessment of CO2 injection from ships in waves
3) Source-sink matching for CCS

Ultra Deep Ocean Drilling:
Scientific ocean drilling can be compared with space exploration in that they both represent frontiers of the human intellect. In order to reach an unprecedented region, the mantle, boring should be initiated: specifically from 4000 m deep sea floor to 7000 m and more. Innovative drilling technology is necessary for this.
Recent research topics include:
1) Accurate estimation of axial dynamics of drilling pipe
2) Numerical simulation model of the Weight-On-Bit fluctuation and stick-slip caused by ship motions
3) Engineering reasonable estimation of fatigue life of very long strings under vortex-induced vibrations in high current

Thermal Power Plant Cooling Water System without Warm Water Discharge:
Most steam power stations in Japan are located on the shore and use surface layer sea water for cooling of the turbine steam. Since the sea water temperature rises (+7 deg C) and is drained back to the sea, the effect of warm waste water diffusion on the coast ecosystem becomes an important issue. In addition, the change of seawater temperature with the seasons becomes a big factor affecting the efficiency of the electricity generation.
Ozaki Lab has developed a new cooling water system to improve power generation efficiency and avoid the thermal discharge problem. This system circulates a cooling medium in closed looped pipeline between the condenser of a power station and the cold region of the deep sea: essentially, it uses the low temperature feature of deep sea water to cool the turbine steam without warm-water discharge.
Recent research topics include:
1) Reduction of energy loss due to fluid circulating with use of the resistance reduction solvent
2) Experiments on fouling in deep water situations
3) Simulation study on entire laying method of underwater pipeline

Changes of Ocean Weather and Marine Operations:
In the Exclusive Economic Zone of Japan, the utilization of renewable ocean energy in the form of offshore wind power, ocean current power, etc., the development of unconventional resources such as methane-hydrate, deep ocean minerals, etc., and offshore CCS as a countermeasure against global warming are becoming activated.
It is crucial to execute various types of marine operations safely and efficiently, so knowledge of the characteristics of ocean weather around Japan and the establishment of appropriate judgment and/or evaluation methods of the operability are quite important.
Using long-term observed data as a basis, Ozaki Lab executes research on how to take the most effective safety measures against squalls (sudden change of winds), how to determine the probability of continuous calm days and/or harsh days, etc.
Recent research topics include:
1) Analysis of the probabilistic features of squalls off Japan based on observed wind data at remote islands
2) Assessment of influence of sudden change of winds on Dynamic Positioning System of ships
3) Wind change due to a down burst in the ocean and its effect on marine operation
4) Markov model of time series of wave heights
5) Markov chain Monte Carlo simulation of marine logistics system considering ocean weather changes
Literature
1) Y.Lu and M.Ozaki, Potential Impact of Sudden Change of Wind Condition on Offshore Operation, Proc. of 36th International Conference on Ocean, Offshore & Arctic Engineering(OMAE2016), Busan, Korea (2016)
2) S.Sugiyama, H.Yamamoto, A.Usami, K.Hirano, H.Suzuki, M.Ozaki, M.Kyo and E.Miyazaki, Development of New Device for Reduction of Fluctuating Lift on Riser Pipe, Int. J. of Offshore and Polar Engineering (2016)
3) M.Ozaki, N.Nakazawa, A.Omata, M.Komatsu and H.Manabe, Ship-based Carbon Dioxide Capture and Storage for Enhanced Oil Recovery, Proc. of Offshore Technology Conference (OTC) 2015, OTC-25861, Houston, USA (2015)
4) Y.Lu and M.Ozaki, Squall in Mid-latitude Regions and its Effect on Offshore Operations, Proc. of 25th International Offshore and Polar Engineering Conference (ISOPE), Kona, USA (2015)
5) M.Ozaki, T.Ohsumi and R.Kajiyama, Ship-based Offshore CCS Featuring Shuttle Ships Equipped with Injection Facilities, Energy Procedia 37, 3184-3190 (2013)
6) N.Kokubun, K.Ko and M.Ozaki, Cargo Conditions of CO2 in Shuttle Transport by Ship, Energy Procedia 37, 3160-3167 (2013)
7) T.Miyazaki, H.Osawa, M.Matsuura, M.Ohta and M.Ozaki, Offshore Operational Availability of Onboard Direct Injection of CO2 into Sub-seabed Geological Formations, Energy Procedia 37, 3168-3175 (2013)
8) N.Nakazawa, K.Kikuchi, K.Ishii, T.Yamaguchi, M.Ohta and M.Ozaki, Ship-based CO2 Injection into Subseabed Geological Formations using a Flexible Riser Pipe Pickup System, Energy Procedia 37, 3176-3183 (2013)
9) M.Ozaki and T.Ohsumi, CCS from multiple sources to offshore storage site complex via ship transport, Energy Procedia 4, 2992-2999 (2011)
10) Y.Shinmoto, T.Miyazaki, E.Miyazaki and M.Ozaki, Weight-on-Bit Fluctuations for Coring Operations on the D/V CHIKYU during the Nankai-Trough Seismogenic Zone Experiments, 21st Int. Offshore and Polar Engineering Conference, ISOPE (2011)
11) T.Inoue, M.Ozaki, T.Miyazaki, M.Nishigaki and K.Setta, Maximum Stress and Fatigue Strength of Drill Pipe in Presence of Strong Ocean Current, Int. J. of Offshore and Polar Engineering, Vol.20, No.1, 15-17 (2010)
12) Y.Namba, S.Uto, T.Nimura, K.Kokubun, T.Kuroda, T.Miyazaki, Y.Okumura and M.Ozaki, Experiments for Modeling Internal Fluid Effect on Hung-off Rigid riser Under Axial Motion, Int. J. of Offshore and Polar Engineering, Vol.20, No.1, 7-14 (2010)
13) M.Nishio, S.M.Masutani, J.Minamiura and M.Ozaki, Study of Liquid CO2 Droplet Formation under Simulated Mid-depth Ocean Conditions, Energy 30, 2284-2297 (2005)
Other Activities
Japan Society of Naval Architecture and Ocean Engineering
Japan Society for Marine Surveys and Technology
Lead Author of IPCC Special Report on Carbon Dioxide Capture and Storage (2003-2005)
ISO-TC265 (CCS), ISSC2018 (Subsea Technology)
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Future Plan
From the medium and long-term points of view, the rise in population and economic growth will form the underlying tone of the world. In order to effectively cope with the issues that accompany this, such as insufficient supplies of food, water, natural resources, energy, etc., and with the inevitable climate changes to come, various countermeasures should be industrialized to produce quantitative, continuous effects. We are actively pursuing the technological and industrial realization of emerging concepts that are adaptable to the ocean field and will contribute to the global society.
Messages to Students
I hope you will intend to contribute to society while making the most of life. To do so, understanding the social situation, identifying the key issues to be tackled, and acquiring the expertise are mandatory. Good training and habit forming while you are young is encouraged.
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