Tsukuba, Japan
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Fukada K.,Shinryo Corporation | Sakai K.,Meiji University | Ono H.,Environmental Science Research Laboratory
14th International Conference of IBPSA - Building Simulation 2015, BS 2015, Conference Proceedings | Year: 2015

In this paper, we compared measurement results with the CFD analysis results using several of modeling methods for a four-way cassette type outlet. As a result, we compiled possible phenomenon in the case of inappropriate modeling methods. For example, the influence of the Coanda effect was overestimated than measurement results when we placed the outlet to the height that was the same as a ceiling and set diagonal airflow condition. Finally we described a modeling method of CFD parts which is appropriate for business and the design phase even if we carry out CFD analysis using a coarse mesh.


Morimoto S.,Shinryo Corporation | Hori S.,Juntendo University | Sakimura Y.,Toda Corporation | Ito A.,Akira Ito is with Nikken Sekkei Ltd. | Hiramatsu K.,Juntendo University
IAQ Conference | Year: 2011

The negative pressure room is indispensable for controlling airborne pathogens such as measles virus and Mycobacterium tuberculosis. However, the conventional negative pressure room is usually designed to regulate air change volume and temperature, but no dynamic analysis of distributions of droplet nuclei under the various air conditions has yet been discussed. We analyzed the dynamics of droplet nuclei in the negative pressure room affected by various air directions, using a Computational Fluid Dynamics (CFD) method. The concentrations of droplet nuclei in the room were increased immediately and reached a steady state 30 minutes, after patient entry. The droplets in a patient's breath were estimated to be diluted approximately 1,100 times soon after release. Once patient has been removed from the room, the concentrations of droplet nuclei were dropped to one thousandth by 60 minutes. No reflux to the anteroom was observed unless the inner door was closed. After opening the door, the concentrations in the anteroom and the corridor increased dramatically by the refluxed air. In addition, the ideal alignment of an exhaust and supply which affected the concentrations was assessed under the same air change rate. It was concluded that directional airflow from feet to the head of patients can reduce the concentrations of droplet nuclei better than conventional ventilation. Dynamic analysis of the distribution of droplet nuclei using a CFD method is useful in designing the optimal isolation room for patients with airborne pathogens. © 2011 ASHRAE.


Sakamoto S.,Shinryo Corporation | Kano N.,Waseda University | Igarashi T.,Waseda University | Tomita H.,Shinryo Corporation
2012 Proceedings of the 29th International Symposium of Automation and Robotics in Construction, ISARC 2012 | Year: 2012

Purpose: We developed a production system for performing renovation work with increased use of pre-cut and prefabrication elements. To develop this system, a faithful 3D-CAD model of an existing building was made using a 3D-laser scanner. The purpose of this research is to develop a method for positioning the pre-cut and pre-fabrication elements precisely and at short notice. Method: First, a 3D-CAD model for renovation was made using the point cloud data of an existing building measured by a 3D-laser scanner. Next, the ID-number and the attribute data of the elements of the 3D-CAD model were stored in a database. The database was then sent to the factory along with the fabrication design drawings. The RFID-tags were put on the corresponding elements in the factory. This system automatically identified the delivered elements by reading the RFID-tags, highlighting the appropriate elements of the 3D-CAD models, and it extracting the positions coordinates automatically. The coordinate data were sent to the automatic positioning system using the motor-driven total station developed by us; the workers were shown the positions by employing laser radiation. The coordinates of the positions were defined on each element and registered as individual information of the element objects. Thus, it is possible to obtain the position information of the elements by simply locating the element objects on the 3D-CAD. Results & Discussion: In our experiment we installed a dry wall in a room in an existing building. Our system helped in eliminating the marking process, and the wall could be installed using only pre-cut elements. However, some issues that need to be tackled in the future were revealed: (i) it might be impossible to point the laser to the position for an element if this position is in mid-air; (ii) since assembling is performed in a particular sequential manner, a method for searching and identifying a required element is needed.


Arai K.,Waseda University | Ogata M.,Waseda University | Fujiwara M.,Waseda University | Tsutsumi H.,Showa Women's University | And 4 more authors.
Indoor Air 2014 - 13th International Conference on Indoor Air Quality and Climate | Year: 2014

We propose an infection-control bed as an infection-control technique using a push-pull local ventilation system and evaluated this bed in this study. The effectiveness in reducing the risk of airborne infection was evaluated using a cough-simulation machine. The machine releases carbon dioxide (CO2) as a tracer gas. The simulated cough was set up to be released in two directions. The directions were assumed such that they typically pose an infection risk to the doctor. In addition, the diffusion-prevention effect in the hospital room was also studied. When the cough was released directly above the bed, the amount of CO2 gas sampled at the measurement points above the patient decreased. The concentration at the most effective measurement point was 91.1 % lower as compared to that in the control case. When the cough was released directly in the doctor's direction, the concentration at the doctor's respiratory area was 56.7 % lower as compared to that in the control case.


Morimoto S.,Shinryo Corporation | Tang H.,Shinryo Corporation | Tanabe S.-I.,Waseda University | Tsutsumi H.,Showa Women's University | Hori S.,Juntendo University
Indoor Air 2014 - 13th International Conference on Indoor Air Quality and Climate | Year: 2014

If a patient is diagnosed with an airborne infectious disease, medical workers can use airborne precautions and isolate the patient in a negative pressure room. However, if the patient has not been diagnosed with the airborne disease, then the medical workers cannot use precautions due to the unwieldy nature of the N95 respirator as well as Powered Air Purifying Respirators (PAPR) being expensive. Furthermore, the patient may share a 4-bed room with compromised patients. In this study, we discussed the reduction methods of droplet nuclei concentration to reduce the infection risk in 4-bed rooms. We conducted the experiments in a full-scale test room. Air supply diffusers were on the ceiling, a square cone diffuser was in the center and four linear slot diffusers were on the step side of each bed between a wall and a partition wall. The largest drop in concentrations occurred with smaller air volumes for the square cone diffuser and larger air volumes for the linear slot diffusers. The concentrations were reduced further by using a rolling screen.


Ogata M.,Waseda University | Suzuki M.,Waseda University | Tanabe S.-I.,Waseda University | Hori S.,Juntendo University | And 2 more authors.
Indoor Air 2014 - 13th International Conference on Indoor Air Quality and Climate | Year: 2014

The objective of this research is to investigate the relationship between the size of a multibed patient room and the risk of airborne infection. Computational fluid dynamics simulations were used to address a number of room sizes with two types of ventilation systems. Assuming that one patient was infected and that infectious agents were contained in exhaled air, the risk of airborne infection was evaluated by the respirable concentration of each patient and the concentration distribution. The results of the simulations show that the airborne infection risk reduced with an increase in the room area, and that the risk of airborne infection tended to increase when the distance between the source of infectious agents and the exhaust outlet was larger than 2.3 m under personal ventilation conditions. In ceiling cassette type conditions, an increase in the room area may increase the risk of airborne infection because the decline in ventilation efficiency and the increase in the ventilation rate decrease the risk of airborne infection.


Sakamoto S.,Shinryo Corporation | Kano N.,Waseda University | Igarashi T.,Waseda University | Kishimoto H.,Shinryo Corporation | And 4 more authors.
Proceedings of the 28th International Symposium on Automation and Robotics in Construction, ISARC 2011 | Year: 2011

In many cases of renovation work, it is very difficult to gain sufficient information about the existing building such as the positions and dimensions of the frame, interior and equipment because of incomplete or missing drawings. As a result, it is necessary to fabricate the parts on the construction site. We have been developing a system for measuring existing buildings precisely using a 3D laser scanner before renovation work, fabricating the parts in factories and assembling them on site. This system will increase productivity and eliminate construction waste. The system requires a function for positioning of the parts and marking precisely on the site. Our developed marking system determines positions from 3D-CAD data and indicates them with a motor-driven Total Station. The position data is produced from objects such as points and lines stored in a design file, and is saved as a marking data file. The Total Station reads the data file and marks the positions by laser automatically and precisely. This report describes the function to produce the position data file and to mark the positions with the Total Station. It also shows the results of a field test at an actual construction site. This research was carried out with a grant from the Ministry of Land, Infrastructure, Transport and Tourism.


Ishida K.,Waseda University | Kano N.,Waseda University | Igarashi T.,Waseda University | Fujii H.,Maeda Corporation | And 3 more authors.
ISARC 2013 - 30th International Symposium on Automation and Robotics in Construction and Mining, Held in Conjunction with the 23rd World Mining Congress | Year: 2013

To achieve renovation work without noise, the authors developed techniques of manufacturing pre-cut interior finishing components for renovation work. In this paper, to achieve the system of pre-cut interior finishing components, the authors describe a measuring method of reinforced-concrete structure by 3D laser scanner and then describe a method of making a design of pre-cut interior finishing components with the polygon model. Using these two methods, the steps of manufacturing pre-cut interior finishing components consist of the following four steps: First, measure the building shape using a 3D laser scanner. Secondly, integrate a point cloud data and retrieve the markings on the floor. Then, create a polygon model of the building based on the point cloud data. Lastly, make a drywall design using a polygon model. To evaluate the technique feasibility of manufacturing pre-cut interior finishing components, the authors have conducted an experiment of the finishing interior work of the drywall. Using pre-cut interior finishing components, the authors have been able to achieve interior finishing work without noise.


Matsukawa Y.,Shinryo Corporation | Chuta H.,Shinryo Corporation | Miyashita M.,Shinryo Corporation | Yoshikawa M.,Yokohama National University | And 2 more authors.
Corrosion | Year: 2011

Galvanic series of 17 metals often used in aerated tap water was determined by measuring corrosion potential. Experimental conditions were selected in considering such systems as water supply, water cooling, water heating, and water condensing. Galvanic series in seawater is easily obtainable. However, very little data on galvanic series in tap water are available in spite of its importance in life lines. The authors found that the time changes of corrosion potential could be classified into five types depending on metals. Galvanic series in tap water was compared to that in seawater. Effect of flow is also discussed. The main results in tap water are that the potential of aluminum does not settle down; the position of stainless steel and copper alloys including pure copper is reversed by applying the flow; the potential of lead is more active than in seawater in contrast to the other metals; the potential differences between stainless steels and copper alloys including pure copper is much smaller than in seawater. © 2011, NACE International.


Patent
Shinryo Corporation | Date: 2013-03-27

Disclosed is an etching solution which enables the formation of a silicon substrate having fine pyramid-like depressions and protrusions (a textured structure) in a steady manner without requiring the use of any conventional etching inhibitor such as isopropyl alcohol. Specifically disclosed is an etching solution in which a silicon substrate is to be immersed to form pyramid-like depressions and protrusions on the surface of the substrate, and which is characterized by comprising at least one component selected from compounds (A) each represented by general formula (1) and alkali salts thereof and an alkali hydroxide (B) at a concentration of 0.1 to 30 wt% inclusive. (In the formula, R represents one of an alkyl group, an alkenyl group and an alkynyl group each having 4 to 15 inclusive of carbon atoms; and X represents a sulfonic acid group.) By using the etching solution, it becomes possible to form a fine textured structure on the surface of a silicon substrate.

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