受験番号：28IPE018

問１
1.
A head mounted display device, comprising:a image generation unit configured to generate a first image for displaying afirst virtual image and a second image serving as an eye guiding image for displaying asecond virtual image for assisting movement of an eye of a user toward the first virtualimage;an image display unit configured to display the generated first and second
images and output display light of the first and second images;
a see-through projection optical unit disposed in front of the eye of the user, thesee-through projection optical unit including a first part configured to project, to the eyeof the user, the display light of the first and second images, and a second part throughwhich the user visually recognizes actual view; anda control unit configured to control the image generation unit.

4.
The head mounted display device according to any of claims 1 to3, wherein,
the second virtual image is displayed in the vicinity of the first virtual image ona virtual image display plane of the first virtual image, andthe second virtual image is a virtual image of an eye guiding object serving as
the eye guiding image, and at least one of color and brightness of the eye guiding object,
and a position of the eye guiding object on the virtual image display plane changes overtime.
5.
The head mounted display device according to claim 4, wherein,when the eye guiding object is an object of which position on the virtual image
display plane changes, andwhen the forward direction with respect to the user is defined as a firstdirection, the left-right direction perpendicular to the first direction and parallel to aline segment connecting the left and right eyes of the user is defined as a second
direction, and the up-down direction perpendicular to both of the the first and second
directions and parallel to the vertical line is defined as a third direction,
the control unit is configured to cause the second virtual image to move on thevirtual image display plane along a part of an arc extending in a line symmetric mannerwith respect to a straight line extending in the second direction so that the position of
the second virtual image in the second direction and the position of the second virtual
image in the third direction are simultaneously changed.
問２
There are known charging and discharging systems for supplying electric power froma storage battery of an electric vehicle to home electrical loads and charging a storage
battery of an electric vehicle by home commercial power supply.
In the conventional charging and discharging system, when a storage battery of anelectric vehicle is charged by commercial power supply, power conditioner for electricvehicles provided as housing equipment is provided for converting AC voltage to certain
DC voltage, in other words, for converting AC power into DC power. On the other hand,when electric power from the storage battery of the electric vehicle is supplied to thehome electrical loads, the power conditioner for electric vehicles converts DC voltage(DC power) output from the storage battery of the electric vehicle into AC voltage (ACpower) to supply the AC voltage to the home electrical loads. An example of such aenergy charging and discharging system including a power conditioner for electricvehicles is a charging and discharging system disclosed in Patent Literature 1.
In power conditioners for electric vehicles used in conventional charging anddischarging systems having charging function for storage batteries of electric vehicles,
when discharging operation for discharging storage battery DC voltage from a storage
battery of an electric vehicle is performed, communication processing is performed
between the power conditioner for electric vehicles and the electric vehicle, and theestablishment of the communication processing is required for initiating theabove-described discharging operation based on a reason described later. Therefore, if
the above-described communication processing is not established, the above-describeddischarging operation cannot be performed.
The reason why the communication processing is required for initiating thedischarging operation is that applying voltage to the charging and discharging terminalof the electric vehicle when the above-described communication processing is notestablished may result in a dangerous situation including the risk of electric shock.
＊翻訳についてのコメント「電機自動車用」は「電気自動車」の誤記と解釈し修正して翻訳いたしました。
「電気自動車通信との間で」は、「電気自動車との間で」の誤記と解釈し修正して翻訳いたしました。

問３(A)
One of the problems of the gradient descent method is difficultly in selection of thelearning rate. When a lower learning rate is selected, improvement in the accuracy of
the DNN (accuracy rate or error) becomes slower, and thus longer time required for thelearning process. On the other hand, when a higher learning rate is selected, learning
progression initially becomes faster, and thus time required until certain extent of
accuracy is achieved becomes shorter. However, sometimes the learning may fail in themiddle of the learning process and the significantly lowered (deteriorated) accuracy
cannot be recovered, on the contrary.
(A’)(B)
Further, in the learning process, the accuracy of the DNN may initially greatly improve,and then may gradually deteriorate. In such a case, the gradual deterioration may be
prevented by re-selecting the learning rate.
Fig. 6 is a graph for illustrating the problem in the gradient descent method. The curveof the error E in Fig. 6 is the same as the curve in Fig. 5. However, learning rate η in theexample of Fig. 6 is set to a constant value higher than that in Fig. 5. In the figure, t
represents time in the learning cycle, and W at each t represents weight at time t. The
curve of error E in Fig. 6 includes a minimum point of the error E (weight = Wmin) anda local minimum point of the error E (weight = Wlocal). The needed weight is the weight
Wmin which gives the minimum error E, and the weight Wlocal is weight which gives alocal solution of the error E. The minimum error E gives best accuracy in the output ofthe DNN. In the DNN to which the initial weight W1 at t = 1 is set, gradient ∂E/∂w is anegative value having a large absolute value, and thus the updated weight W2
significantly shifts in the positive (right) direction, and the error function E (W2) alsosignificantly decreases.
(B’)