受験番号：32IPE016

Ans.1[Claim 1]
A cardiothoracic ratio calculation device that calculates a cardiothoracic ratioon the basis of a chest X-ray image, the cardiothoracic ratio calculation device
comprising:a measurement position inferring unit configured to infer a lung right end
position, a lung left end position, a heart right end position, and a heart left end positionin the chest X-ray image; anda cardiothoracic ratio calculation unit configured to calculate a cardiothoracic
ratio on the basis of the lung right end position, the lung left end position, the heart
right end position, and the heart left end position which have been inferred,
whereinthe measurement position inferring unit divides the chest X-ray image into aplurality of horizontal-direction regions, and, in each of the horizontal-direction regions,detects a lung right end candidate and a lung left end candidate on the basis of pixel
values and detects a heart right end candidate and a heart left end candidate on thebasis of a derivative, in the horizontal direction, of the pixel values, and furthermore,
the measurement position inferring unit
extracts a specific horizontal-direction region on the basis of
a distance between a lung intermediate point determinedaccording to the lung right end candidate and the lung left end candidate and a heart
intermediate point determined according to the heart right end candidate and the heart
left end candidate, ora proportion of the distance to a lung width determinedaccording to the lung right end candidate and the lung left end candidate, andinfers the lung right end candidate, the lung left end candidate, theheart right end candidate, and the heart left end candidate in the extracted
horizontal-direction region, as the lung right end position, the lung left end position, theheart right end position, and the heart left end position.
[Claim 2]
The cardiothoracic ratio calculation device according to claim 1, wherein,
if a higher X-ray transmittance is set to lead to a larger pixel value, themeasurement position inferring unit
detects, as the lung right end candidate, a position at which the pixelvalue is smallest in a region that is within a predetermined range from a right edge ofthe horizontal-direction region, anddetects, as the lung left end candidate, a position at which the pixel
value is smallest in a region that is within a predetermined range from a left edge of thehorizontal-direction region.
[Claim 3]
The cardiothoracic ratio calculation device according to claim 1 or 2, wherein
the measurement position inferring unit
detects, as the heart right end candidate, a position at which thederivative is largest in a negative direction between the lung right end candidate andthe lung left end candidate in the horizontal-direction region, anddetects, as the heart left end candidate, a position at which thederivative is largest in a positive direction between the lung right end candidate and thelung left end candidate in the horizontal-direction region.
Ans.2
Conventionally, a technology called blockchain has been known. Thistechnology is a mechanism in which synchronization for the same record is performed
among a large number of nodes on a network. This technology is called blockchain
because, in the case of adding new records to among existing records, blocks eachserving as the unit of record are added one after another in the form of a chain while
taking over content (hash) of the immediately preceding block. In general, although
the term “blockchain” sometimes refers, in a narrow sense, to a database structure inwhich blocks are linked in the form of a chain, the term is sometimes used also in a
broad sense encompassing a mechanism in which the nodes operate as a peer-to-peer
network and a mechanism of approval of transactions. Thus, currently, the definitionof the term is not clear. Considering this, both senses are distinguish from each otherin the present specification in the following manner. That is, if the term is used in theformer narrow sense, the technology is referred to as “blockchain”, whereas, if the term
is used in the latter broad sense, the technology is referred to as “blockchaintechnologies”.
The blockchain technologies have many advantages such as zero down time,difficulty of manipulation, and low cost. Thus, the blockchain technologies havestarted to attract attention, not only as technologies for virtual currencies including
bitcoin and currencies derived therefrom but also as a means for managing, astransactions, information about various assets. For example, non-patent document 1

describes using, for certification of existences and identities of various documents, ablockchain capable of playing an important role of establishing reliability.
As the blockchain technologies, a blockchain technology of a public node typeand a blockchain technology of a private node type exist. The public node type is a typein which anyone can participate as a node on a network. Meanwhile, the private nodetype is a type in which only permitted persons can participate as nodes on a network.
Ans.3<In Case of Occurrence of Reverse Fire>
When reverse fire R comes in from the burner element 15, the burner 100 issuch that, as shown in FIG. 3(B), the thermally expandable member 22 thermallyexpands toward the inner circumference side owing to heat of the reverse fire R, to beformed as a thermally expanded member 222 of which the opening 22H has been closed.
As a result, since the opening 22H of the thermally expanded member 222(22)is closed, the heat of the reverse fire R and the ultraviolet light L emitted from the flame
F generated by the burner element 15 are less likely to reach the flame detection sensor
23.
In the present embodiment, a control unit (not shown) is configured as follows,for example. That is, if the flame detection sensor 23 detects the ultraviolet light L,
the control unit (not shown) determines that the burner 100 is normally performing
burning. Meanwhile, if the amount of the ultraviolet light L detected by the flame
detection sensor 23 takes a value (inclusive of zero) that is equal to or smaller than apreset threshold value, the control unit (not shown) determines that reverse fire ormisfire has occurred.
As a result, if misfire occurs in the burner 100 and ultraviolet light L is notemitted, or if, as shown in FIG. 3(B), the thermally expandable member 22 thermallyexpands and the flame detection sensor 23 becomes unable to detect the ultraviolet light
L or the amount of the detected ultraviolet light L is equal to or smaller than thethreshold value, the control unit (not shown) determines that misfire or reverse fire hasoccurred in the burner 100.