18IPE013up.txt
受験番号： 18IPE013============================================================================
問1
1.

A reference voltage generating circuit comprising:a first resistance (10) having one terminal supplied with a firstpotential, and having another terminal connected to an output terminal for
outputting a reference voltage;a second resistance (11) having one terminal supplied with a second
potential, and having another terminal connected to the output terminal;
a first bipolar transistor (15) of a first polarity, the first bipolartransistor (15) having a collector supplied with the first potential, and having
an emitter connected to the output terminal;
a second bipolar transistor (16) of a second polarity different from thefirst polarity, the second bipolar transistor (16) having a collector suppliedwith the second potential, and having an emitter connected to the output
terminal;
a first bias generating circuit (17 and 18) configured to generate afirst direct-current bias voltage and supply the first direct-current bias
voltage to a base of the first bipolar transistor; anda second bias generating circuit (19 and 20) configured to generate asecond direct-current bias voltage and supply the second direct-current bias
voltage to a base of the second bipolar transistor.
2.
The reference voltage generating circuit according to claim 1, wherein
the first direct-current bias voltage is lower than the reference
voltage, and has a value equal to or more than a voltage value obtained bysubtracting a forward voltage between the base and the emitter of the firstbipolar transistor from the reference voltage, andthe second direct-current bias voltage is higher than the reference
voltage, and has a value lower than a voltage value obtained by adding a forward
voltage between the base and the emitter of the second bipolar transistor to thereference voltage.
問2
OCT (Optical Coherence Tomography) for forming an image of a crosssection of an object to be measured using a phenomenon of interference of alight beam such as a laser or the like is now drawing attention. OCT does nothave human body invasiveness. Thus, OCT is expected to be used in a wide rangeof applications in a medical field and a biochemical field. In an
ophthalmological field, for example, devices for forming cross-sectional imagesof the fundus of an eye, a cornea, and the like have already been put topractical use.
Patent Document 1 discloses a device to which OCT is applied. This
device is provided with a measuring arm that scans an object by a rotary
scanning mirror (galvanometer mirror), a reference arm on which a reference
mirror is mounted, and an interferometer at an exit of the device whichinterferometer analyzes the intensity of interference light of luminous fluxes
from the measuring arm and the reference arm by using a spectroscope. Further,
the reference arm is configured to change the phase of the reference light to adiscrete value stepwise.
The device disclosed in Patent Document 1 uses a method of so-called
Fourier domain OCT. The device images a shape in a direction of depth
ページ(1)

18IPE013up.txt(z-direction) of an object to be measured by irradiating the object to bemeasured with a beam of low-coherence light, generating interference light bysuperimposing the light reflected from the object to be measured and reference
light on each other, obtaining a spectral intensity distribution of theinterference light, and subjecting the spectral intensity distribution to a
Fourier transform.
問3
A remote communication device is connected to a monitoring unit via an
arbitrary appropriate network such as a cellular network or the Internet. It isneedless to say that the network includes a public switched network, a radio
link, cable connection, short message service, and the like as otheralternatives.
A remote monitoring device requests an object to be monitored to
identify the object himself/herself, and next instructs the person to perform a
specific monitoring or measuring procedure. The object is informed how to
perform a measurement and how to transmit a result of the measurement to themonitoring device.
A typical example of the monitoring unit is a remote monitoring unit,
which can be disposed on a hospital side in the network connection. However,this is a mere example. Procedure operation performed by use of the monitoring
unit may be performed at a convenient position between a patient and a medicalspecialist. Typically, when a patient connects using a digital device, the user
may perform various kinds of procedure operations between the user and theremote unit. In another form, the user manually connects using a telephone. In
this case, the patient performs the procedure at a remote place.

ページ(2)