受験番号:28IPE009
Q1[Claim 1]
A head-mounted display apparatus comprising:
an image generation section that generates a first image for displaying a firstvirtual image and that generates a second image serving as a viewpoint guidance image
for displaying a second virtual image which is for supporting movement of a viewpointof a user toward the first virtual image;an image display section that displays the generated first and second images
and that outputs display light for the first and the second images;
a perspective projection optical section that is disposed at the front of the eyesof the user, and that includes a first portion configured to project the display light for thefirst and the second images to the eyes of the user and includes a second portion
configured to cause the user to perspective see a real view; anda control section that controls the image generation section.
[Claim 4]
The head-mounted display apparatus according to any one of claims 1 to 3,
wherein:the second virtual image is displayed on a virtual image display surface fordisplaying the first virtual image so as to be close to the first virtual image; andthe second virtual image is a virtual image of a viewpoint guidance object
serving as the viewpoint guidance image, in which at least one of the color, thebrightness, and the position on the virtual image display surface changes over time.
[Claim 5]
The head-mounted display apparatus according to claim 4, wherein in a casewhere the position on the virtual image display surface, of the viewpoint guidance
object changes,
and when a direction ahead of the user is defined as a first direction, a left-right
direction that is perpendicular to the first direction and that is along a line segment
connecting the left and right eyes of the user is defined as a second direction, and an
up-down direction that is perpendicular to the first and the second directions and that isalong the vertical line is defined as a third direction,
the control section causes the second virtual image to move on the virtual
image display surface along a portion of a circular arc linearly symmetrical in thesecond direction such that the position of the second virtual image changes both in thesecond direction and in the third direction.

Q2.
Hitherto known are energy charge/discharge systems that supply electric
power to a home electric appliance load from a storage battery of an electric vehicle andthat charge a storage battery of an electric vehicle using household commercial power
supply.
Such hitherto-known charge/discharge systems charge a storage battery of anelectric vehicle from commercial power supply by converting AC voltage into
predetermined DC voltage by means of an electric vehicle power conditioner installed
as a housing facility, that is, by converting AC power into DC power. Conversely, in acase of supplying power to a home electric appliance load from a storage battery of anelectric vehicle, DC voltage (DC power) outputted from a storage battery of an electricvehicle is converted into AC voltage (AC power), by means of an electric vehicle power
conditioner, to thereby be supplied to the home electric appliance load. An example ofsuch energy charge/discharge systems having an electric vehicle power conditioner is acharge/discharge system disclosed in patent document 1.
In an electric vehicle power conditioner used in a hitherto-known
charge/discharge system having a function of charging a storage battery of the electricvehicle, when discharge operation for discharging of storage battery DC voltage is to be
executed on a storage battery of an electric vehicle, the following process is imposed asa requirement for start of the discharge operation because of the reason described below.
That is, a communication process is initially executed between the electric vehicle
power conditioner and electric vehicle communication, and then the communication
process is established. Accordingly, if the communication process is not established,
the discharge operation cannot be executed.
The reason why the communication process is required for start of thedischarge operation is that application of voltage to a discharge terminal on the electricvehicle side while the communication process is not being established can lead to adangerous situation such as shock hazards.

Q3.
(A)
One of problems posed by the gradient descent method is difficulty in selectionof learning rate. When a smaller learning rate is selected, it is difficult to improve theaccuracy (accuracy rate or error) of the DNN, and the learning process takes a long time.
Meanwhile, when a greater learning rate is selected, the initial learning progresses
quickly and time taken until a certain degree of accuracy is reached can be shorten.
However, there is a case where the learning fails in midstream, ending up with no
improvement while the accuracy decreases (deteriorates) largely.
(A’)(B)
Further, there is also a case where the accuracy of the DNN improves largely atthe beginning of learning, and then the accuracy deteriorates gradually. In such a case,the gradual deterioration can be avoided by re-selecting the learning rate.
FIG. 6 illustrates a problem of the gradient descent method. The curve oferror E in FIG. 6 is identical to that in FIG. 5. In the example of FIG. 6, the learningrate η is set constant and in addition, set higher than that in FIG. 5. In the diagram, trepresents learning cycle time, and W represents weight at each time t. The curve oferror E in FIG. 6 includes a point at which the error E is the minimum (weight Wmin),and includes a point at which the error E is not the minimum, but a local minimum(weight Wlocal). The target is the weight Wmin at which the error E is minimized, andthe weight Wlocal is a weight for inputting an error E into a local solution.
Minimization of the error E leads to maximization of the accuracy of output of the DNN.
In the DNN, in the case of time t=1, weight W1, which is an initial value, the gradient∂E/∂w indicates a negative value and the absolute value is large, and thus weight W2
after update shifts largely toward the positive direction (rightward) and the error
function E(W2) decreases largely.
(B’)