Histologically, the islets consist of three major and at least two minor cell types.
Beta cells, which synthesize and secrete insulin, make up about 60% of a typical islet.
Alpha cells are the source of glucagon, 30% of islet tissue.
Delta cell, which are less abundant, produce somatostatin.
F cells, which secrete pancreatic polypeptide.
Fifth cell type that secretes ghrelin.
Fifty cell typ
2007년 논문에 의하면, 포유류의 UCP는 총 5종류(UCP1, UCP2, UCP3, UCP4, UCP5)가 있다. 이 중에서 생리적 기능에 대해 비교적 논란의 여지가 없는 것은 UCP1이고, UCP2와 UCP3는 생리적 기능이 계속해서 밝혀지고 있는 중이며, 나머지 UCP는 생리적 기능이 하나도 밝혀지지 않은 상태이다. 그래서 이 자료에선 UCP4, UCP5
1. 기존 PLANT 내의 제어실에 새로운 CONTROL SYSTEM 을 설치하고 기존 CONTROL SYSTEM 과의 DATA COMMUNICATION을 하려고 한다. 이때 고려해야할 사항을 설명하시오. 또한, OSI (Open System Interconnection) 7 Layer 에 대해 설명하고 TCP/IP 4계층과 비교 및 적용되는 Protocol의 예를 드시오.
① 이기종간의 제어시스템간의 데이타
2.3 C-V graph
The measured MOS capacitance (called gate capacitance) varies with the applied gate voltage.
① Measurement of C-V characteristics
-Apply any DC bias, and superimpose a small (15 mV) ac signal
-Generally measured at 1 MHz (high frequency) or at variable frequencies between 1KHz to 1 MHz
-The dc bias VG is slowly varied to get quasi-continuous C-V characteristics
② C-V chara
4. Equipment
4.1 RCA cleaning
RCA cleaning is a series of rinsing procedure prior to experiment with Si wafer. The purpose of the RCA clean is to remove organic contaminants (such as dust particles, grease or silica gel) from the wafer surface. There are three steps to be performed. The first step is to remove organic contaminant from surface of wafer. Second step is to remove any oxide layer
Abstract- This paper presents an X-band voltagecontrolled
hairpin resonator oscillator using GaAs
MESFET varactor. To get wide tuning range, the
hairpin resonator is combined with the MESFET
varactor. It is incorporated into the series feedback
oscillator. The measurement of the oscillator
showed the frequency tuning range of 11.15 MHz
with the output power flatness less than 0.10 dB at
t
A filter is widely used in overall RF system. There are many species and structures in filter. A filter seems to be simple, but there are many considerations to design filter. In this paper, we design microstrip bandpass filter which has bandwidth of 500 MHz and center frequency of 2.5 GHz. Alumina is used as substrate, and chromium is used as conductor. Final results are achieved as follows. Ins
○ PECVD
∙ What is PECVD?
⇒ Radio frequency(RF) is used to induce plasma in the deposition gas.
⇒ This results in a higher deposition rate at relatively low temperatures.
⇒ With the plasma enhanced CVD process is the deposition at temperature around 300℃ allows.
⇒ The temperature will be through encouragement of a plasma with high frequency electric fields triggered.
Voltage Controlled Oscillator)를 만들어보고자 한다. 학부과정동안 배우는 마이크로파 이론을 다시 한번 숙지하고 실제적으로 어떻게 제조되는지 그 과정을 습득하고 ADS 시뮬레이터를 통해서 설계하고 시뮬레이션 작업을 거친 뒤, 제작에 임할 것이다. 이를 통해서 우리는 졸업 이후의 실제적인 업무에 빠른