Nippon Telegraph and Telephone Corporation

Yosuke Okamura

Yosuke Takeuchi

Hisatoshi Kasahara

Junichiro Tamamatsu

Tomoki Murakami

Norihiro Fujimoto

A passive relay device () relays radio communication between the inside of a radio wave shielding structure () and the outside of the radio wave shielding the structure (), and the device includes an internal antenna () which connects with the inside, an external antenna () which connects with the outside, and a connection part () which connects the internal antenna () and the external antenna ().

Passive relay device and passive relay method

An assessment device () according to the present disclosure includes a determination unit () that determines a first period corresponding to a shortest period until deterioration of a concrete structure due to an aging-induced deterioration cause appears and a second period shorter than the first period and corresponding to a longest period until deterioration of the concrete structure due to a material-induced deterioration cause appears and an assessment unit () that assesses that a deterioration causing material is used in a concrete structure having, in a checking result indicating a period elapsed from construction of the concrete structure and the presence or absence of deterioration in the concrete structure, the deterioration and the period elapsed from the construction which is not shorter than the second period and is shorter than the first period.

Concrete structure deterioration determination method, device and program

An estimation method includes: an acquisition step (S) of acquiring deflection stress information that indicates a relationship between a deflection and a tensile stress of a specimen () of a reinforced concrete structure; and a derivation step (S) of deriving an estimation formula for estimating a depth of a crack generated in the reinforced concrete structure when a deflection of the reinforced concrete structure is no less than a first deflection of the specimen at a start of a generation of the crack, and is no greater than a second deflection of the specimen at an end of the generation of the crack.

Estimation method, estimation device, and program

A degradation predicting method is a degradation predicting method for predicting degradation of a reinforced concrete structure buried in the ground, the method including: a condensation occurrence condition evaluating step (S) of evaluating a condensation occurrence condition on which condensation occurs on reinforcing steel; a condensation time calculating step (S) of calculating a condensation time that is a total time in which condensation occurs on the reinforcing steel based on the condensation occurrence condition for each of a plurality of the reinforced concrete structures; a threshold determining step (S) of determining a threshold of underground depth at which the reinforced concrete structure is less prone to degradation based on a relationship between the condensation time and a underground depth of the reinforced concrete structure; and a degradation predicting step (S) of predicting degradation of a prediction-target reinforced concrete structure based on the threshold.

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Tokyo, Japan

Yosuke Okamura