18IPE010up.txt
受験番号：18IPE010============================================================================
問1
Claim 1
A reference voltage generating circuit comprising:a first resistor (10) having a first end supplied with a first electric
potential and a second end connected to an output terminal of a reference
voltage;a second resistor (11) having a first end supplied with a second
electric potential and a second end connected to the output terminal;
a first bipolar transistor (15) having a first polarity, the firstbipolar transistor (15) having a collector supplied with the first electric
potential and an emitter connected to the output terminal;
a second bipolar transistor (16) having a second polarity different fromthe first polarity, the second bipolar transistor (16) having a collector
supplied with the second electric potential and an emitter connected to theoutput terminal;
a first bias generating circuit (17, 18) for generating a first
direct-current bias voltage and supplying the first direct-current bias voltageto a base of the first bipolar transistor; anda second bias generating circuit (19, 20) for generating a second
direct-current bias voltage and supplying the second direct-current bias voltage
to a base of the second bipolar transistor.
Claim 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 that is not smaller than a voltage value calculated 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 smaller than a voltage value calculated by adding aforward voltage between the base and the emitter of the second bipolartransistor to the reference voltage.
問2
A lot of attention is now being drawn to optical coherence tomography(OCT), which is a technique for forming a cross-sectional image of a measurementtarget object by means of interference phenomenon of a light beam such as alaser beam. OCT, which is noninvasive to the human body, is hoped to find its
applications in such fields as the medical and biochemical fields. In theophthalmological field, for example, there is already an apparatus in practicaluse that forms a cross-sectional image of the fundus, the cornea or the like ofthe eye.
Patent Document 1 discloses an apparatus that uses OCT. This apparatus
includes a measurement arm provided with a rotary scanning mirror (galvanometermirror) to scan an object, a reference arm provided with a reference mirror, andan outlet provided with an interferer that analyzes the intensity of coherent
light in luminous flux from the measurement arm and the reference arm with useof a spectrometer. The reference arm is arranged to change the phase ofreference light in stages into discontinuous values.
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The apparatus disclosed in Patent Document 1 uses the so-called
Fourier-domain OCT technique. Specifically, the apparatus emits a low-coherence
light beam to a measurement target object, superimposes reflected light from themeasurement target object onto reference light to generate coherent light,
obtains a spectral intensity distribution for that coherent light, and performs
Fourier transform on that spectral intensity distribution. This operation forms
an image of the shape of the measurement target object along its depth direction(z direction).
問3
The telecommunication device is connected to a monitoring unit over anappropriate network such as a cellular network or the Internet. Alternatives of
the network, needless to say, include a public switched telephone network, radio
link, cable splicing, and short message service.
The remote monitoring device requests the monitoring service user to
identify himself/herself, and then instructs the user to perform a particular
procedure for monitoring or measurement. The user is provided with information
on how to perform measurements and how to transmit the measurement results tothe monitoring device.
A typical example of the monitoring unit is a remote monitoring unit,
which can be installed on the hospital side of a network connection. This is,however, a mere example. The monitoring unit may alternatively perform its
treatment operations at any convenient location between the patient and themedical professional. Typically, when the patient uses a digital device toconnect to the network, treatment operations may be performed for the user
through a communication between the user and the remote unit. Alternatively, theuser manually may make a telephone call to connect to the network, in which casetreatments are performed at a location away from the patient.

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