受験番号：28IPE010

ans. 1Claim 1A head mount display device comprising:
an image generation unit that generates a first image for displaying a firstvirtual image, and a second virtual image, as a viewpoint guiding image, fordisplaying a second virtual image that assists movement of viewpoints of a user tothe first virtual image;an image display unit that displays the generated first and second images,
and outputs display light of the first and second images;
a projection see-through optical unit that is disposed before the eyes of
the user, and includes a first portion and a second portion, the first portion
projecting the display light of the first and second images on the eyes of the user,
the second portion causing the user to see-through an actual scene; anda control unit that controls the image generation unit.
Claim 4The head mount display device according to any one of claims 1 to 3, wherein
the second virtual image is displayed near the first virtual image on a
virtual image display surface for the first virtual image, andthe second virtual image is a virtual image of a viewpoint guiding object
as the viewpoint guiding image, of which at least one of color, brightness, andposition on the virtual image display surface changes with time.
Claim 5The head mount display device according to claim 4, whereinin a case where the viewpoint guiding object is one, of which position on
the virtual image display surface changes,
assuming that a forward direction of the user is a first direction, aright-left direction perpendicular to the first direction and along a line segment
connecting the right and left eyes of the user is a second direction, and an up-down
direction perpendicular to each of the first and second directions and along a
vertical line is a third direction,
the control unit causes the second virtual image to move, on the virtual image

display surface, along a part of an arc that is line-symmetrical in the second
direction such that both the position of the second virtual image in the second
direction and the position of the second virtual image in the third direction change.
ans. 2.
Conventionally, an energy charging/discharging system for supplying powerfrom a storage battery of an electric automobile, and charging the storage batteryof the electric automobile from a domestic commercial power supply, has been known.
In the conventional charging/discharging system, when the storage batteryof the electric automobile is charged from the commercial power supply, the charging
is performed by converting an AC voltage to a predetermined DC voltage, i.e.,
converting AC power to DC power, by use of a power conditioner, for electricautomobiles, provided as a house facility. Meanwhile, when power is supplied fromthe storage battery of the electric automobile to a home-appliance load, a DC voltage(DC power) output from the storage battery of the electric automobile is converted
to an AC voltage (AC power) by the power conditioner for electric automobiles, and
the AC voltage is supplied to the home-appliance load. Patent Literature 1 discloses
acharging/discharging

systemwhichisanexampleofsuchanenergycharging/discharging system having a power conditioner for electric automobiles.
As for the power conditioner for electric automobiles that is used in theconventional charging/discharging system and has the function of charging a storage
battery of an electric automobile, when the power conditioner is caused to executea discharge operation of discharging a DC voltage from the storage battery of theelectric automobile, firstly, a communication process is executed between the power
conditioner and the electric automobile, and establishment of the communication
process is given as a requirement for start of the discharge operation, for the reason
described below. Therefore, unless the communication process is established, thedischarge operation is not executable.
The reason why the communication process is given as the requirement for startofthedischarge

operationisbecause,

ifavoltage

isapplied

toacharging/discharging terminal on the electric automobile side with the communication
process being not established, the electric automobile may be in a dangerous statethat may cause an electric shock or the like.

ans. 3(A)One of problems of the gradient descent is difficulty in selecting a learningrate.

If the learning rate is selected to be low, the accuracy (errors and/or rateof correct answers) of the DNN is slow to be improved, which makes the learning processneed long hours.

On the other hand, if the learning rate is selected to be high,the progress of the learning in the initial stage is accelerated and therefore thetime required to attain a certain degree of accuracy is reduced.

In this case,however, the learning may collapse in the middle, and the accuracy may be greatlyreduced (deteriorated) and may not be improved anymore.
(A’)(B)
Meanwhile, there is a case where, during the learning, the accuracy of theDNN is greatly improved in the initial stage and thereafter is gradually deteriorated.
Also, in this case, the gradual deterioration of the accuracy may be avoided byreselecting a learning rate.
FIG. 6 is a diagram for explaining the problem of the gradient descent. Acurve of an error E shown in FIG. 6 is similar to that in FIG. 5.

In the exampleof FIG. 6, however, the learning rate η is set to be higher than in FIG. 5 and isconstant.

In FIG. 6, t indicates the time of a learning cycle, and W at each t

indicates a weight at the time t.

The curve of the error E in FIG. 6 has a point(weight = W min ) at which the error E is minimum, and a point (weight = W local ) at which
the error E is not minimum but is minimal. A target is the weight W min that minimizes
the error E, and the weight W local is a weight that plunges the error E into a localsolution.

Minimizing the error E is equivalent to optimizing the accuracy of theoutput of the DNN.

In the DNN in which a weight W 1 of an initial value, at time t=1,

is set, since a gradient ∂E/∂w is negative and an absolute value thereof is great,a weight W 2 after update significantly moves in the positive direction (rightwarddirection), and an error function E(W 2 ) is also significantly reduced.
(B’)