Imai lab. IIS, The University of Tokyo + hclab. + LOW FAT structure.Inc

Read more# Category: research

## Evaluating Accessibility to parking lots

A store owner in an area where public transportation network is not very developed wants to grasp his store’s site condition considering car access, because residents of such an area usually move by private car. In this situation, evaluating accessibility for parking lots must not be overlooked. In this article, we will show a simulation for evaluating accessibility to parking lots. There are 7 Ome municipal parking lots and 6 private parking lots in this area. The following illustration represents mapping of these parking lots. In the simulation, we presume that visitors of this area park their cars in the closest parking lot from the present place. We set initial condition […]

Read more## Evaluating Openness index of streets.

We can consider “Openness of street” as one conventional comfort index. In order to evaluate this index, we emit rays from a certain point, and calculate the number of rays which can reach the sky without being obstructed by the other buildings or trees. By carrying out calculations on whole points in a street, we can draw a distribution of “Openness index”. This Openness index is useful for simulate the influence toward surround buildings, and we can use this simulation when designing new buildings.

Read more## What if we can cancel the restriction of one-way street in Kyoto?

Min-Max is a decision rule used in decision theory, game theory, statistics and for minimizing the possible loss for a worst case (maximum loss) scenario. The presence or absence of one-way street will affect on accessibilities of places. In this article, we will adopt this index to every intersections in Kyoto, assuming many situations including cancellation of restrictions of one-way street. Index of “min-max” is very important when we have to decide a location of emergence vehicle station, because this index means that how efficiently we can relief a person in disadvantage. The left side of figure3 shows distribution of one-way streets in Kyoto (red represents one-way, blue represents two-way […]

Read more## Sequential Time-map on directional weighted graph (street network including public transportation on slopes)

This example is about Tokyo Ueno area. Considering about undulating terrain can be ignored when thinking about how various means of transportation shrink cities. When trying to consider about this effects, calculating the ratio of walking speed to the other speed of transportation. In this article, we will show “Time Distance Map” of a city, which has various transportation. The above animation shows traveling time distance map when a traveler move from his origin to destination. The procedure of drawing time distance map. Calculating shortest path and time from a present point. Drawing concentric circles at regular intervals (1 minutes). Moving all points with preserving the angle between origin and […]

Read more## Time-Distance map of typical floors Shinjuku Mitsui building.

If we discretize continuous space by using random delaunay network, it becomes possible to find shortest path even on continuous space with arbitrary obstacles according to Dijkstra’s algorithm. In this article, we find shortest path from entrance of Mitsui building in Shinjuku to every place in the building. First animation shows the process of calculating distance (colors represent distance, red is far and blue is close), and drawing a time distance map from entrance of building. In this animation, you can easily realize how distant each place of building is. At a glance, you may think this building is homogenous, but can realize heterogenous space with many obstacles like walls, […]

Read more## ”Time Distance Map” of WTC (World Trade Center) in New York and CCTV (China Central TV) in Beijing

Animation represent time distance from entrance to all places in WTC. Bank segmentation of elevator

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