Maeda Corporation

Tokyo, Japan

Maeda Corporation

Tokyo, Japan
Time filter
Source Type

An information processing device processes target information described using identifiers formed from a symbol, a product operator that joins together factors containing one or more of the identifiers and thereby forms a string of ordered factors, and a sum operator that joins together terms containing one or more of the factors and thereby forms an expression that is a combination of the terms. Also, information processing device includes a dividing unit that divides the target information into a plurality of terms at a predetermined position; and a transmission unit that associates positional information with at least any of the factors contained in the terms resulting from the division and causes each of the terms resulting from the division to be held in any of a plurality of server devices, where the positional information contains an occurrence sequence of the terms in the target information and an occurrence sequence of the factors in the terms.

Kabushiki Kaisha Topcon and Maeda Corporation | Date: 2016-03-30

The invention provides a safety diagnosis system for structure, which comprises one GNSS receiver installed on an upper floor of a structure, a control device having a storage unit for storing a program which prepares an absolute displacement curve of the structure based on an absolute coordinate measured by the GNSS receiver and a displacement of the absolute coordinate, calculates a maximum inter-layer displacement and a maximum inter-layer deformation angle per each floor based on the absolute displacement curve and prepares an inter-layer deformation angle curve and a judging unit for performing a diagnosis of the safety of the structure based on the maximum inter-layer displacement and the maximum inter-layer deformation angle, and a display unit, wherein the control device calculates the maximum inter-layer displacement and the maximum inter-layer deformation angle per each floor and the inter-layer deformation angle curve based on a displacement of the absolute coordinate and the program and makes the display unit display a diagnosis result of the structure as evaluated by the judging unit based on at least one of the maximum inter-layer displacement and the maximum inter-layer deformation angle or the inter-layer deformation angle curve.

Shang F.,Tsinghua University | An X.,Tsinghua University | Mishima T.,Maeda Corporation | Maekawa K.,University of Tokyo
Journal of Advanced Concrete Technology | Year: 2011

Reinforcing bar corrosion induces splitting cracks in concrete along the bar axis and leads to bond deterioration. This can adversely affect the crack spacing in an RC member and have a serious effect on its serviceability. This study looks at axial nonlinearityin corroded RC members under tension and shows that fewer transverse cracks with greater spacing occur as steel corrosion progresses. The open-slip coupled model, which takes into account the transverse action associated with longitudinal bond stress transfer in the bond transition zone, is extended to cover corroded reinforcement and is successfully used to simulate the behavior of RC members in tension. Modeling of the bond transition zoneand of the layer of corrosion products is found to be crucial to understanding residual bond performance after corrosion has occurred. Copyright © 2011 Japan Concrete Institute.

Enteria N.,Tohoku University | Yoshino H.,Tohoku University | Mochida A.,Tohoku University | Satake A.,Maeda Corporation | And 5 more authors.
Solar Energy | Year: 2012

This paper shows the numerical investigation of the developed solar-desiccant cooling system applied in the East Asian climatic conditions with two different desiccant wheel coating materials - the Silica-Gel (SiO 2) and the Titanium Dioxide (TiO 2). The developed and validated numerical model of the system is currently used in the present study incorporating the two new materials in the desiccant wheel. The system was applied in temperate climate (Beijing and Tokyo), subtropical climate (Taipei and Hong Kong) and tropical climate (Manila and Singapore). The study showed that the specification of the solar-desiccant cooling system varies depending on the climatic conditions. It showed that the required flat plate collector area was getting larger from the temperate climate to the tropical climate. The storage tank requirement was getting bigger in the tropical climate compared to the subtropical and temperate climate. The volumetric flow rate of air was getting higher from temperate climate to tropical climate. In the comparison of the two materials, it was found that the Titanium Dioxide (TiO 2) can support lower indoor temperature and humidity ratio than the Silica-Gel (SiO 2) with the same specification of the solar thermal system and desiccant cooling system. In general, the solar-desiccant cooling system can provide the required indoor temperature and humidity ratio. However, for the hot and humid climate such as in tropical, large size of the solar thermal system is needed. In addition, higher volumetric flow of air to support the high cooling load is required. With regard to the new material, Titanium Dioxide, it is proven to be a good alternative material since it can provide lower indoor temperature and humidity ratio with higher cooling performance than the Silica-Gel. © 2012 Elsevier Ltd.

Enteria N.,Tohoku University | Yoshino H.,Tohoku University | Satake A.,Maeda Corporation | Mochida A.,Tohoku University | And 4 more authors.
Experimental Thermal and Fluid Science | Year: 2010

The experimental evaluation of the separated and coupled rotating desiccant wheel and heat wheel is reported. The study aims to investigate the performance of the desiccant wheel and of the heat wheel both when operated separately and jointly. The performance evaluation of the desiccant wheel is based on its moisture removal capacity (MRC), moisture removal regeneration (MRR), and moisture mass balance (MMB). In addition, the study used the total energy balance (TEB), sensible coefficient of performance (COPSensible), latent coefficient of performance (COPLatent) and, total coefficient of performance (COPTotal). The performance of the heat wheel is based on its effectiveness. The COPSensible, COPLatent and, COPTotal are used in the performance evaluation of the coupled desiccant wheel and heat wheel. The general results of the study show that the MRC, MRR and MMB coupled with the TEB, COPLatent, COPSensible and COPTotal predict adequately the performance of the desiccant wheel. In addition, the coupled operation of the desiccant wheel and heat wheel, contributed to the reduction of the external thermal energy requirement for the regeneration of the desiccant wheel. This study can be applied in other researches seeking evaluation of the desiccant wheel, heat wheel, and their combined operation. Moreover, the data presented here are significant for the desiccant wheel benchmarking and for evaluation of the desiccant wheel models. © 2009 Elsevier Inc. All rights reserved.

Enteria N.,Tohoku University | Yoshino H.,Tohoku University | Satake A.,Maeda Corporation | Mochida A.,Tohoku University | And 3 more authors.
Applied Energy | Year: 2010

This paper reports the development and construction of the novel solar cooling and heating system. The system consists of the thermal energy subsystem and the desiccant cooling subsystem. The system utilizes both the cheaper nighttime electric energy and the free daytime solar energy. The system is conceptualized to produce both cooling during summer daytime and hot water production during winter. Testing and evaluation of the system had been done to determine its operational procedure and performance. Based on the results, the thermal energy subsystem functioned to its expected performance in solar energy collection and thermal storage. The desiccant cooling subsystem reduced both the temperature and the humidity content of the air using solar energy with a minimal amount of back-up electric energy. The system however, needs further investigation under real conditions. © 2009 Elsevier Ltd.

Enteria N.,Tohoku University | Yoshino H.,Tohoku University | Takaki R.,Tohoku University | Yonekura H.,Tohoku University | And 2 more authors.
Energy and Buildings | Year: 2013

This paper presents the first and second law analyses of the developed solar-desiccant air-conditioning system (SDACS). The results of the analyses show that the solar collector is the main contributor to both energy loss and exergy destruction of the system at 35.56% and 55.30%. The water pipe network contributed to 13.45% and 1.65% of energy loss and exergy loss. Electric heater contributed to 0.66% and 7.94% of the energy loss and exergy destruction. Storage tank contributed to 5.80% and 6.70% of energy loss and exergy destruction. Desiccant wheel contributed to 3.25% and 0.58% of energy loss and exergy destruction. Air fans contributed to 0.44% and 1.51% of energy loss and exergy destruction. At present, the thermal energy system (TES) has energy and exergy performances based on electric consumption of 2.428 and 0.199. The desiccant cooling system (DCS) has energy and exergy performances based on thermal consumption of 0.403 and 0.093. The desiccant cooling system has in terms of energy and exergy performances based on electric consumption of 1.627 and 0.029. The whole system (SDACS) energy and exergy performance based on electric consumption are 1.238 and 0.084. © 2013 Elsevier B.V.

Enteria N.,Japan Building Research Institute | Yoshino H.,Tohoku University | Sataki A.,Maeda Corporation
International Journal of Air-Conditioning and Refrigeration | Year: 2016

This paper presents the exergoenvironment analysis of the developed desiccant-based air-conditioning system subjected to different regeneration temperatures. Exergoenvironment is a new evaluation tool combining the exergetic and life-cycle analyses to determine the environmental effect of the system’s components and the energy utilized for the system’s operation. The different materials in the manufacture of the system’s components and sources of energy to operate the system have different environmental impacts. The results of the study show the system components exergy efficiency, system exergy destruction, relative environmental impact difference and exergoenvironmental impact factor which are important parameters for this analysis. It shows that some components need exergy performance improvements through replacement with high efficiency components to minimize environmental impact. Based on the results, application of the exergoenvironmental analysis is an important tool for knowing the environmental impact of the system components and its operation. The method is important in desiccant air-conditioning systems in which different materials of the components and energy are utilized for the system design and operation. © 2016 World Scientific Publishing Company

Maruyama Y.,Maeda Corporation | Tamura T.,Tokyo Institute of Technology | Okuda Y.,Japan Building Research Institute | Ohashi M.,Japan National Institute for Land and Infrastructure Management
Journal of Wind Engineering and Industrial Aerodynamics | Year: 2012

CFD has come to be used in the prediction of wind loads by the development of computer. Wind loads acting on buildings located in turbulent boundary layer are affected by the characteristic of approach flow strongly. Because inflow wind fluctuations affect the results of calculation with CFD, various kinds of methods to generate inflow wind fluctuations are suggested. On the other hand in wind tunnel experiment, PIV (Particle image velocimetry) technology has improved and been able to catch the high frequency turbulent fluctuations. We can acquire time-dependent-data of three-dimensional wind velocity components directly by stereo PIV. This report presents the result of LES calculation of turbulent boundary layer developed on flat floor for inflow generation using stereo PIV measurement results, and we discuss the applicability and the utility of this method. The simulated results show that the turbulent boundary layer is formed and reaches the equilibrium state at a relatively short distance from the starting point of computation. It can be thought that this method is useful for reproducing a turbulent boundary layer by LES. © 2012 Elsevier Ltd.

Furuya H.,Obayashi Corporation | Fujiyama T.,Maeda Corporation
Proceedings of the 28th International Symposium on Automation and Robotics in Construction, ISARC 2011 | Year: 2011

Recent years, new construction systems as AMG (automatic Machine Guidance) and AMC (Automatic Machine Control) have been developed with the Global Positioning System (GPS) and made fit for practical use. Added to this, an indirect measuring theory to control the compaction extent and elasticity, which uses the acceleration data of compaction drum, has been researched and developed since 1998 in Japan, and has recently come to be applied to the real construction sites. From such a background, the authors developed new equipment which is named "Alfa-system" for quality control of soil compaction. The advantage of the system is as follows. Fill compaction levels can be real-timely judged. Acceleration data of wheel vibration are consecutively measured, and these data are transmitted to the control room for data processing. Then, the data are compared with the standard control values that are established beforehand by the test executions. Examined data can be used for countermeasures, such as eliminating the under-compacted or inferior parts. And this system provides more benefit, once using system in construction, both supervisor in the sight office and driver of the compaction rollers can see 2-dimentional pictures of the compacted levels on the computer screens. And the data from Alfasystem can be used for QC/QA. Moreover, in the future, the system can be improved to feed back to the quality control immediately. This will improve the effectiveness and efficiency of compaction control.

Loading Maeda Corporation collaborators
Loading Maeda Corporation collaborators