Introduction
바이오 에어로졸(Bioaerosol)의 정의
공기 중에 부유하는 입자로서, 생물체를 포함하거나 생물체로부터 방출된 분자량이 크거나 휘발성이 큰 혼합물질.
(Airborne particles, large molecules or volatile compounds that are living, containing living organisms or were released from living organisms by ACGIH).
바이오 에
측정의 정의
관찰대상이 가지고 있는 특성에 대해서 일정한 규칙에 따라 기술적으로 수치나 심볼을 부여함으로 계량화 하는 것
개체가 가지고 있는 속성을 관찰하여 변수 값으로 표현하는 것
Measurement 의 가장 중요한 측면은 특성에 대해 어떻게 숫자를 부여 할 것인가에
대한 문제
숫자를 적용
The threshold voltage of a MOSFET is usually defined as the gate voltage where an inversion layer forms at the interface between the insulating layer (oxide) and the substrate (body) of the transistor. The purpose of the inversion layer's forming is to allow the flow of electrons through the gate-source junction. The voltage of oxide is given by
V_OX= 1/C_OX 2√(qN_A ε_Si V_0 )
SiO_2 V_O
Date: 2010/05/06 Thursday 3~4 p.m.
Time for observation : 1 hour
Details of atmosphere: Few customers, quiet and clean atmosphere, staffs already cleaned the store but were still cleaning again because they were not busy.
Number of working staffs: 4, not everyone was working
Number of visitors: about 50 people
Non-probability Samples
Convenience Samples
Subjects: Korea Univ. students
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