受験番号：36IPE004
Q1
In recent years, the development of 3D printers of a layer stacking
type, which implement a building method of forming a layered form(structure) by stacking layers on the basis of a 3D printing technology,
has been advancing in a construction field regardless of domestic oroverseas. A material used for a 3D printer of the layer stacking typeis basically a cement-based material.

Mortar kneaded by a mixer ispumped by a pump and supplied to a three-dimensional formation apparatus.
Construction with a 3D printer of the layer stacking type enables astructure to be formed by stacking layers without the use of molds. It
is expected that the construction is highly advantageous when comparedwith conventional concrete construction in terms of labor saving, degreeof freedom in design, safety, and the like.
[0003]
To put such a construction method in practical application in
the future, it is necessary to develop and improve 3D printers, as wellas to examine the pumpability of material, self-standing properties ofmaterial immediately after discharged from a nozzle to a layered form
(structure), surface texture of a layered body after hardened, and thelike.
[0004]
Forming a layered form (structure) with high construction
accuracy mainly requires the development of a material with highself-standing performance, and the development of machinery in termsof positional accuracy and speed of a nozzle, discharge amount ofmaterial, and the like. Further, a structural performance that enables
a formed construct (a structural form) to exert sufficient strength forvarious external forces is required.
Q2[0037]The high frequency inverter 12 of the power transmitting unit
1 and the high frequency rectifier circuit 22 of the power receiving
unit

2

areeachconstitutedbyfour

reverse-conductingpowersemiconductor switches (Q1 to Q4), such as MOSFETs and IGBTs, whichconstitute the full-bridge circuit. Specifically, the high frequency
inverter 12 and the high frequency rectifier circuit 22 are eachconstituted by a pair of inverter legs. In the inverter legs, a high-side
switching element (Q1) and a low-side switching element (Q2) areconnected together in series, a high-side switching element (Q3) anda low-side switching element (Q4) are connected together in series, andeach of the switching elements is connected in parallel to a reverse
parallel diode. Further, to the high frequency inverter 12 of the powertransmitting unit 1, a phase-shift pulse-width modulation method thatis capable of adjusting a high frequency output only by performing phase
control on driving timings of the switching elements (Q1 to Q4) is applied.
[0038]The voltage smoothing capacitor 24 connected in parallel to thebattery 21 of the power receiving unit 2 smooths a signal by suppressing
ripples produced after the rectification by the high frequency rectifier
circuit 22 so as to make the signal closer to a direct current.
[0039]The power transmitting side resonance circuit 13 is constituted
by a reactor (L1) and a variable capacitor (C1), and the power receivingside resonance circuit 23 is constituted by a reactor (L2) and a variablecapacitor (C2).

An ultrasonic transducer including a piezoelectricbody, such as the BLT, is a capacitive load (C type load). Accordingly,
the ultrasonic transducer may be combined with the reactor to implement
the resonance circuit.
[0040]As described above, since the BLT is given in advance a compressive
stress with a bolt, the BLT is capable of providing a highly large stressamplitude.

The BLT can be used as a strong ultrasonic transducer.

Further, the BLT has a high mechanical strength and has a highelectro-acoustic conversion efficiency.

The BLT is therefore suitablefor contactless ultrasound power transmission in the sea. The BLT has
a natural mechanical resonance frequency. By driving the BLT at theresonance frequency or a frequency close to the resonance frequency,
a highly large stress amplitude can be provided.

Q3
1. A position estimating system that estimates a position of a radio
wave receiving device in a predetermined space based on received signal
strengths of radio waves transmitted from three or more radio wave
transmitting devices and received by the radio wave receiving device
in the space, the position estimating system comprising:acquiring means for acquiring information about the received
signal strengths of the radio waves received from the three or more radio
wave transmitting devices;
generating means for generating a first vector based on piecesof the information that correspond to at least three radio wave
transmitting devices of the three or more radio wave transmitting
devices, the first vector including distances between the at least three
radio wave transmitting devices and the radio wave receiving device,
as elements of the first vector; andestimating means for estimating the position of the radio wave
receiving device based on a similarity between the first vector and asecond vector that corresponds to a predetermined position in the space,
the second vector including distances between the at least three radio
wave transmitting devices and the predetermined position, as elementsof the second vector.
2. The position estimating system according to claim 1, wherein
the second vector is generated in such a manner that the second
vector corresponds to each of a plurality of positions on a predeterminedplanar region in the space, andthe estimating means estimates the position of the radio wave
receiving device based on a similarity between the first vector and thesecond vector that corresponds to each of the plurality of positions.
3. The position estimating system according to claim 1 or 2, wherein
the second vector is generated in such a manner that the second
vector corresponds to each of a plurality of sets each of which isconstituted by at least three radio wave transmitting devices of thethree or more radio wave transmitting devices, the plurality of setshaving different combinations of the at least three radio wave

transmitting devices,
the generating means generates the first vector for each of theplurality of sets, andthe estimating means estimates the position of the radio wave
receiving device based on a similarity between the first vector and thesecond vector, the first vector being generated for each of the pluralityof sets.

【翻訳コメント】[0002], l.1-l.3：「3D プリント技術を用いて積層造形体(構造物)を積層しながら造形する構築方法である積層型 3D プリンター」は、「3D プリント技術を用いて積層造形体(構造物)を積層しながら造形する構築方法を実現する積層型 3D プリンター」と解釈して訳しました。