• 한국치위생학회지
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• 제13권2호
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• pp.181-191
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• 2013

Objectives : The research was performed to be used as basic data for dental hygienists' job satisfaction during clinical practice, and planning and operating effective clinical practice by analyzing stress factors in dental hygienists and the extent of stress caused by students in clinical practice. Methods : The research was aimed at dental hygienists working at college dental hospitals, dental clinic of general hospitals, dental hospitals and dental clinics located in Seoul and Gyeonggi province where clinical practices were conducted for dental hygiene students. For analysis, collected data was analyzed by using SPSS 20.0. Results : Results derived from analysis on characteristic difference by pattern of hospital were observed that there was a significant difference in job satisfaction by pattern of hospital. Results from analysis on correlation among stress factors were observed that there was correlation between behavior and attitude, interpersonal relationships, role and activity, ideal and value, and treatment fields. Results derived from analysis on the effect of stress factors on the job satisfaction were observed that role and activity (p=.002<.01), ideal and value (p=.019<.05), and treatment fields (p=.032<.05) affected the job satisfaction, while behavior and attitude (p=.386>.05), and interpersonal relationships ((p=.421>.05) did not affect the job satisfaction. A stress factor, role and activity (${\beta}$=.350) affected the job satisfaction the most, followed by ideal and value (${\beta}$=.242), and treatment fields (${\beta}$=-.185). For the explanation ability, the stress factors accounted for 20.5% of the job satisfaction. Conclusions : In conclusion, most of the dental hygienists are satisfied with students' clinical practice by pattern of hospital. Positive correlation was shown between stress factors. Behavior and attitude and ideal and value are high in stress in college dental hospitals, role and activity and treatment fields are high in stress in dental hospital, and interpersonal relationships are high in stress in dental clinics.

• 대한수학회지
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• 제50권5호
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• pp.991-1008
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• 2013

In this paper, we mainly discuss Gorenstein Dedekind do-mains (G-Dedekind domains for short) and their overrings. Let R be a one-dimensional Noetherian domain with quotient field K and integral closure T. Then it is proved that R is a G-Dedekind domain if and only if for any prime ideal P of R which contains ($R\;:_K\;T$), P is Gorenstein projective. We also give not only an example to show that G-Dedekind domains are not necessarily Noetherian Warfield domains, but also a definition for a special kind of domain: a 2-DVR. As an application, we prove that a Noetherian domain R is a Warfield domain if and only if for any maximal ideal M of R, $R_M$ is a 2-DVR.

• 대한수학회지
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• 제31권3호
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• pp.367-373
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• 1994

Let us consider the Cauchy problem $$ {\rho_t + \upsilon \cdot \nabla\rho = 0 {\rho[\upsilon_t + (\upsilon \cdot \nabla)\upsilon] + \nabla p + \rho f {div \upsilon = 0 (1.1) {\rho$\mid$_t = 0 = \rho_0(x) {\upsilon$\mid$_t = 0 = \upsilon_0(x) $$ in $Q_T = R^3 \times [0,T]$, where $f(x,t), \rho_0(x) and \upsilon_0(x)$ are given, while the density $\rho(x,t)$, the velocity vector $\upsilon(x,t) = (\upsilon^1(x,t),\upsilon^2(x,t),\upsilon^3(x,t))$ and the pressure p(x,t) are unknowns. The equations $(1.1)_1 - (1.1)_3$ describe the motion of a nonhomogeneous ideal incompressible fluid.

• 대한수학회지
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• 제31권3호
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• pp.467-475
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• 1994

In 1983 Harmand and Lima [5] proved that if X is a Banach space for which K(X), the space of compact linear operators on X, is an M-ideal in L(X), the space of bounded linear operators on X, then it has the metric compact approximation property. A strong converse of the above result holds if X is a closed subspace of either $\elll_p(1 < p < \infty) or c_0 [2,15]$. In 1979 J. Johnson [7] actually proved that if X is a Banach space with the metric compact approximation property, then the annihilator K(X)^\bot$ of K(X) in $L(X)^*$ is the kernel of a norm-one projection in $L(X)^*$, which is the case if K(X) is an M-ideal in L(X).

• 충청수학회지
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• 제31권1호
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• pp.47-52
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• 2018

Let ${\delta}$ be a derivation in a noetherian integral domain A. It is shown that a natural map induces a homeomorphism between the spectrum of $A[z;{\delta}]$ and the Poisson spectrum of $A[z;{\delta}]_p$ such that its restriction to the primitive spectrum of $A[z;{\delta}]$ is also a homeomorphism onto the Poisson primitive spectrum of $A[z;{\delta}]_p$.

• 대한수학회보
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• 제59권5호
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• pp.1177-1190
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• 2022

Let R be a commutative ring with identity. We call the ring R to be an almost quasi-coherent ring if for any finite set of elements α₁, …, α_p and a of R, there exists a positive integer m such that the ideals $\bigcap{_{i=1}^{p}}\;R{\alpha}^m_i$ and Ann_R(α^m) are finitely generated, and to be almost von Neumann regular rings if for any two elements a and b in R, there exists a positive integer n such that the ideal (αⁿ, bⁿ) is generated by an idempotent element. This paper establishes necessary and sufficient conditions for the Nagata's idealization and the amalgamated algebra to inherit these notions. Our results allow us to construct original examples of rings satisfying the above-mentioned properties.

• 전자공학회논문지
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• 제52권2호
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• pp.119-124
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• 2015

본 논문은 광원 라인폭이 spectral amplitude coding (SAC) OCDMA 시스템에 미치는 영향을 구하였다. q와 m값에 따라 다양한 코드를 구현할 수 있으므로 symmetric balance incomplete block design(BIBD) 코드를 분석에 사용하였다. 그 결과 입력파워가 큰 경우 ($P_{sr}=-10dBm$) 이상적인 BIBD 코드가 비이상적인 BIBD 코드보다 더 좁은 광원 라인폭이 요구되었다. 그러나 입력파워가 작은 경우 ($P_{sr}=-25dBm$)에는 그 반대로 비이상적인 BIBD 코드가 이상적인 BIBD 코드보다 더 좁은 광원 라인폭이 필요했다.

• 충청수학회지
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• 제23권1호
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• pp.169-176
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• 2010

Let $k={\mathbb{F}}_q(T)$ and ${\mathbb{A}}={\mathbb{F}}_q[T]$. In this paper, we obtain the the criterion for the parity of the ideal class number h(${\mathcal{O}}_K$) of the real biquadratic function field $K=k(\sqrt{P_1},\;\sqrt{P_2})$, where $P_1$, $P_2{\in}{\mathbb{A}}$ be two distinct monic primes of even degree.

• 대한수학회지
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• 제57권3호
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• pp.571-583
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• 2020

The Galois ring R of characteristic pⁿ having p^mn elements is a finite extension of the ring of integers modulo pⁿ, where p is a prime number and n, m are positive integers. In this paper, we develop the concepts of Jacobi sums over R and under the assumption that the generating additive character of R is trivial on maximal ideal of R, we obtain the basic relationship between Gauss sums and Jacobi sums, which allows us to determine the absolute value of the Jacobi sums.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2011년도 제41회 하계 정기 학술대회 초록집
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• pp.284-284
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• 2011

Ion sensitive field effect transistor (ISFET)는 용액 중의 각종 이온 농도를 측정하는 반도체 이온 센서이다. ISFET는 작은 소자 크기, 견고한 구조, 즉각적인 반응속도, 기존의 CMOS공정과 호환이 가능하다는 장점이 있다. ISFET의 기본 구조는 기존의 metal oxide semiconductor field effect transistor (MOSFET)에서 고안되었으며, ISFET는 기존의 MOSFET의 게이트 전극 부분이 기준전극과 전해질로 대체되어진 구조를 가지고 있다. ISFET소자의 pH 감지 메커니즘은 감지막의 표면에서 pH용액의 수소이온이 막의 표면에 속박되어 표면전위의 변화를 유발하는 것에 기인한다. 그 결과, 수소이온의 농도에 따라 ISFET의 문턱전압의 변화를 일으키게 되고 드레인 전류의 양 또한 달라지게 된다. 한편, ISFET의 좋은 pH감지특성과 높은 출력특성을 얻기 위하여 high-k물질들이 감지막으로써 지속적으로 연구되어져 왔다. 그 중 Al2O3와 HfO2는 높은 유전상수와 좋은 pH 감지능력으로 인하여 많은 연구가 이루어져온 물질이다. 하지만 HfO2는 높은 유전상수를 갖음에도 불구하고 화학용액에 대한 non-ideal 효과에 취약하다는 보고가 있다. 반면에 Al2O3의 유전상수는 HfO2보다 작지만 화학용액으로 인한 손상에 대하여 강한 immunity가 있는 재료이다. 본 연구에서는, 이러한 각각의 high-k 물질들의 단점을 보안하기 위하여 SiO2/HfO2/Al2O3(OHA) 적층막을 이용한 ISFET pH 센서를 제작하였으며 SOI 기판에서 구현되었다. SOI기판에서 OHA 적층막을 이용한 ISFET 제작이 이루어짐에 따라서 소자의 signal to noise 비율을 증대 시킬것으로 기대된다. 실제로 SOI-ISFET와 같이 제작된 SOI-MOSFET는 1.8${\times}$1010의 높은 on/off 전류 비율을을 보였으며 65 mV/dec의 subthreshold swing 값을 갖음으로써, 우수한 전기적 특성을 보이는 ISFET가 제작이 되었음을 확인 하였다. OHA 감지 적층막의 각 층은 양호한 계면상태, 높은 출력특성, 화학용액에 대한non-ideal 효과에 강한 immunity을 위하여 적층되었다. 결론적으로 SOI과 OHA 적층감지막을 이용하여 우수한 pH 감지 특성을 보이는 pH 센서가 제작되었다.