18IPE011up.txt
受験番号：18IPE011============================================================================
問1
1.
A reference voltage generating circuit comprising:a first resistor (10) including an end to which a first electric potential issupplied, and another end connected to an output terminal from which a reference
voltage is output;
a second resistor (11) including an end to which a second electric
potential is supplied, and another end connected to the output terminal;
a first bipolar transistor (15) having a first polarity, the firstbipolar transistor (15) including a collector to which the first electric
potential is supplied, and an emitter connected to the output terminal;
a second bipolar transistor (16) having a second polarity that isdifferent from the first polarity, the second bipolar transistor (16) including
a collector to which the second electric potential is supplied, and an emitterconnected to the output terminal;
a first bias generating circuit (17, 18) configured to generate andsupply a first direct-current bias voltage to a base of the first bipolartransistor; anda second bias generating circuit (19, 20) configured to generate andsupply a second direct-current bias voltage to a base of the second bipolartransistor.
2.

The reference voltage generating circuit according to claim 1, whereina value of the first direct-current bias voltage is lower than a valueof the reference voltage and is equal to or higher than a value of a voltage
obtained by subtracting a value of a base-emitter forward voltage of the firstbipolar transistor from the value of the reference voltage, anda value of the second direct-current bias voltage is higher than thevalue of the reference voltage and is lower than a value of a voltage obtainedby adding the value of the reference voltage to a value of a base-emitter
forward voltage of the second bipolar transistor.
問2
Recently, attention has been focused on an OCT (Optical CoherenceTomography) that forms the image of a cross section of a measuring object using
an interference phenomenon of a light beam such as a laser beam. The OCT does
not have an invasive procedure on a human body and thus has been expected to bewidely applied in the medical field and the field of biochemistry. As anexample, in the field of ophthalmology, apparatuses to form the images of crosssections of, for example, eyeground and cornea have already been put into
practical use.
Patent document 1 discloses an apparatus to which the OCT is applied.
This apparatus includes a measurement arm to scan on object using a rotary
scanning mirror (galvanometer mirror), a reference arm provided with a reference
mirror, and an exit at which an interference device is provided to analyze theintensities of the interference light of light fluxes from the measurement arm
and the reference arm using a spectroscope. In addition, the reference arm isconfigured to change the phase of reference light into discontinuous values instages.
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The apparatus disclosed in patent document 1 uses what is called“Fourier domain OCT” technique. The apparatus irradiates an measuring object
with a beam of low coherence light, generates interference light bysuperimposing reference light and reflected light from the measuring object,obtains the spectrum intensity distribution of the interference light for
performing Fourier conversion to obtain an image of the shape of the measuring
object with reference to a direction of depth thereof (z direction).
問3
A remote communication apparatus is connected to a monitoring unit using
an arbitrary proper network such as a cellular network or the Internet.
Needless to say, the network includes, for example, public switched telephone
networks, radio links, cable connections, short message services asalternatives.
A remote monitoring apparatus makes a request for an object person to
identify herself/himself and then gives that person an instruction to perform aparticular monitoring or measuring procedure. The object person is notified of
how to perform a measurement and how to report the result of the measurement to
the monitoring apparatus.
A typical monitoring unit is a remote monitoring unit, which may bedisposed on the hospital side of a network connection. However, this is simply
an example, and procedures based on the monitoring unit may be performed at aposition convenient for a patient and a medical professional. When the patientestablishes connection using a digital apparatus, the user may typically perform
various procedures using the remote unit. In another embodiment, the user
manually establishes connection using a telephone, and, in this case, proceduresare performed at a location distant from the patient.

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