★★★ ＜第28回知的財産翻訳検定試験【第15回和文英訳】＞ ★★★
≪１級課題 -電気・電子工学-≫【問 1】
1. A head mounted display device comprising:
an image generation unit that generates a first image for displaying
a first virtual image and a second image, serving as a viewpoint guidance
image, for displaying a second virtual image for assisting a user to move theviewpoint of the user to the first virtual image;an image display unit that displays the generated first image andsecond image and outputs display light of the first image and the secondimage;a projection/see-through optical unit disposed in front of an eye of theuser and including a first portion for projecting the display light of the firstimage and the second image to the eye of the user, and a second portion forallowing the user to see a real view in a see-through manner; anda control unit that controls the image generation unit.
4. The head mounted display device according to any one of claims 1 to 3,
whereinthe second virtual image is displayed in the vicinity of the first
virtual image on a virtual image display surface for the first virtual image,the second virtual image is a virtual image of a viewpoint guidance
object serving as the viewpoint guidance image, and the viewpoint guidance
object changes, with time, in at least one of hue, luminance, and position on
the virtual image display surface.
5. The head mounted display device according to claim 4, wherein
when the viewpoint guidance object is configured to change inposition on the virtual image display surface, a forward direction from theuser is defined as a first direction, a left/right direction, which is a direction
perpendicular to the first direction and which is along a line segment
connecting each eye of the user, is defined as a second direction, and avertical direction along a vertical line, which is a direction orthogonal to eachof the first direction and the second direction, is defined as a third direction,
the control unit moves the second virtual image, on the virtual image

display surface, along a part of a circular arc which is linearly symmetricalin the second direction so that the position of the second virtual image in thesecond direction and the position thereof in the third direction both change.
【問 2】
There is a conventionally known energy charging and discharging
system that supplies electric power from an electric vehicle storage battery
to a home appliance load, or charges an electric vehicle storage battery froma household commercial power supply.
The conventional charging and discharging system charges anelectric vehicle storage battery from a commercial power supply byconverting an AC voltage to a predetermined DC voltage, i.e., by converting
AC power to DC power with an electric vehicle power conditioner provided ashousehold equipment. Conversely, the conventional charging anddischarging system supplies electric power from an electric vehicle storage
battery to a home appliance load by converting a DC voltage (DC power)
output from the electric vehicle storage battery to an AC voltage (AC power)with the electric vehicle power conditioner. Such energy charging anddischarging systems having an electric vehicle power conditioner include, forexample, the charging and discharging system disclosed in Patent Document
1.
In the electric vehicle power conditioner used in a conventionalcharging and discharging system that has a function for charging an electricvehicle storage battery, when performing a discharge operation for
discharging a storage battery DC voltage from the electric vehicle storage
battery, communication processing is first attempted between the electricvehicle power conditioner and an electric vehicle communication, andestablishment of the communication processing is imposed as an operation
start requirement for the above discharge operation, for the reasonsdescribed below. Therefore, if the above communication processing is notestablished, it is impossible to perform the above discharge operation.
The establishment of the communication processing is imposed as
the operation start requirement for the discharge operation because, if theabove communication processing is not established, a voltage applied to thecharging and discharging terminals of the electric vehicle may result in adanger of electric shock or the like.

【問 3】(A)

One of the problems with the gradient descent method is thedifficulty in selecting the learning rate. If the learning rate is selected to below, the accuracy (accuracy rate and error) of a DNN is not readily improved,
and the learning process takes a long time. On the other hand, if thelearning rate is selected to be high, progress of learning at the beginningmay be faster, and the time to attain a certain degree of accuracy may be
shorter; however, the learning may fail midway. That is, the accuracy may
be adversely reduced (deteriorated) without any improvement.
(A’)
(B)

Also, the accuracy of a DNN may improve greatly at the beginningduring the learning and then gradually deteriorate. Also in such a case,reselection of the learning rate may prevent the accuracy from deteriorating
gradually.
FIG. 6 is a diagram for describing the problem with the gradientdescent method. The curve of the error E in FIG. 6 is the same as in FIG. 5;
however, in the example in FIG. 6, the learning rate η is set higher than thatin FIG. 5 and is set to be constant. In FIG. 6, t indicates the time of thelearning cycle, and W at each t indicates the weight at time t. The curve ofthe error E in FIG. 6 has a point (weight Wmin) at which the error E isminimum and a local minimum point (weight Wlocal), which is not aminimum point. The goal is the weight Wmin that minimizes the error E,
and the weight Wlocal is a weight that causes the error E to fall into a local
solution. Minimizing the error E means that the accuracy of the output of
the DNN is the best. When the initial weight W1 is set for the DNN at time
t1, the gradient ∂E / ∂w is negative, and the absolute value thereof is large.
Therefore, the updated weight W2 moves by a large amount in the positive
direction (right direction), and the error function E (W2) also greatly
decreases.
(B')