• 간호행정학회지
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• 제12권1호
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• pp.151-158
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• 2006

Purpose: This study was undertaken in order to suggest self-leadership as a way to promote organization efficiency of nursing organization. So the relation between self-leadership and outcome of nursing practice in organization was studied. Method: The subjects of study were nurses as a population who were working for the 2 of university hospitals which have over 500 beds in Kyong Ki Province as well as who have been working for over 6 months. The data was collected by questionnaires from 215 nurses and analyzed using descriptive statistics, perason correlation coefficient, t-test and ANOVA on SAS Program. Results: Self-leadership of nurse got 3.51 grade out of 5 as a mean point. Each of the segments got 3.74 in self-compensation, 3.57 in self-expectation, 3.53 in goal-setting, 3.45 in rehearsal, 3.37 in self-criticism and 3.30 in constructive thinking in order. Independent performance of nursing practice at each items of outcome of nursing practice showed the highest correlations with the self-expectation among self-leadership segments. Constructive thinking, self-compensation, rehearsal, goal-setting were related like this in order, but self-criticism was related just a little. Dependent nursing practice has the highest correlation with the self-expectation, goal-setting, rehearsal, constructive thinking, self-compensation were similar as aboves in order, but self-criticism didn't show any similar correlations. Relationship practice has the highest correlation with the self-expectation, and goal-setting, constructive thinking, self-compensation, rehearsal were similar, while self-criticism did not show any correlations. Conclusion: In conclusion the result was obtained that self-leadership is much correlated with outcome of nursing practice. Therefore, as a way to promote efficiency of nursing organization, the constant study about self-leadership with the various aspects is needed focusing on self-management and inner motivation as a new leadership paradigm.

• 대한수학회논문집
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• 제22권4호
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• pp.547-552
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• 2007

The unit interval is not homeomorphic to a self-similar Cantor set in which we studied the dimensions of distribution subsets. However we show that similar results regarding dimensions of the distribution subsets also hold for the unit interval since the distribution subsets have similar structures with those in a self-similar Cantor set.

• 충청수학회지
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• 제19권4호
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• pp.357-364
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• 2006

We study Hausdorff and packing dimensions of subsets of a general coding space with a generalized ultra metric from a multifractal spectrum induced by a self-similar measure on a self-similar Cantor set using a function satisfying a H${\ddot{o}}$older condition.

• East Asian mathematical journal
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• 제19권2호
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• pp.213-219
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• 2003

We study the properties of non-diffenrentiable points of a self-similar Cantor function from which we conjecture a generalization of Darst's result that the Hausdorff dimension of the non-diffenrentiable points of the Cantor function is $(\frac{ln\;2}{ln\;3})^2$.

• Journal of Astronomy and Space Sciences
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• 제18권1호
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• pp.1-6
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• 2001

In this paper we investigate the properties of advection-dominated accretion flows (ADAFs) in case that outflows carry away infalling matter with its angular momentum and energy. Positive Bernoulli number in ADAFs allow a fraction of the gas to be expelled in a form of outflows. The ADAFs are also unstable to convection. We present self-similar solutions for advection-dominated accretion flows in the presence of outflows from the accretion flows(ADIOS). The axisymmetric flow is treated in variables integrated over polar sections and the effects of outflows on the accretion flow are parameterized for possible configurations compatible with the one dimensional self-similar ADAF solution. We explicitly derive self-similar solutions of ADAFs in the presence of outflows and show that the strong outflows in the accretion flows result in a flatter density profile, which is similar to that of the convection-dominated accretion flows(CDAFs) in which convection transports the angular momentum inward and the energy outward. There two different versions of the ADAF model should show similar behaviors in X-ray spectrum to some extent. Even though the two models may show similar behaviors, they should be distinguishable due to different physical properties. We suggest that for a central object of which mass is known these two different accretion flow should have different X-ray flux value due to deficient matter in the wind model.

• 정보처리학회논문지C
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• 제10C권1호
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• pp.51-60
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• 2003

네트워크를 설계하고 서비스를 구현하는데 있어서 중요한 변수중의 하나는 트래픽의 특성을 파악하는 것이나 기존의 트래픽 예측과 분석은 포아송(Poisson) 또는 마코비안(Markovian)을 기본으로 하는 모델을 사용하였다. LAN, WAN 및 VBR(Variable Bit Rate) 트래픽 특성에 관한 최근의 실험적 연구들은 기존의 포아송 가정에 의한 모델들이 네트워크 트래픽의 장기간 의존성 및 자기 유사한 특성들을 과소평가 함으로써 실제 트래픽의 특성을 제대로 나타낼 수 없다는 것을 지적해 왔고 최근 실제 트래픽과 유사한 모델로서 자기 유사한 특성을 이용한 접근법이 대두되고 있다. 따라서, 본 논문에서는 실제 트래픽과 유사한 자기 유사 데이터 트래픽을 백그라운드 부하로 발생시켜 기존의 ABR (Available Bit Rate) 혼잡제어 알고리즘 중 대표적인 EFCI(Explicit Forward Congestion Indication), EPRCA(Enhanced Proportional Rate Control Algorithm), ERICA(Explicit Rate Indication for Congestion Avoidance), NIST(National Institute of Standards and Technology) 스위치 알고리즘이 버스트한 트래픽에 대해 효율적으로 반응하는지를 ACR(Allowed Cell Rate), 버퍼 사용율, 셀 폐기율, 전송효율 등으로 나누어 분석을 하였다.

• 한국정보통신학회논문지
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• 제6권3호
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• pp.416-420
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• 2002

네트워크 트래픽의 연구 동향은 LAN, WAN 및 VBR 비디오 트래픽이 통계학적으로 자기 유사과정에 의해 더욱 더 잘 모델링화 된다는 사실을 입증하고 있다. 이것은 기존의 단기간 의존성만을 고려한 포아손 과정에 비해 다른 이론적 특성을 가진다. 즉 광범위한 시계열상에서 aggregation의 정도가 변하더라도 통계학적으로 동일한 특성을 지니게 된다는 것이다. 본 논문에서는 이러한 자기유사과정을 갖는 데이터를 실시간 운영중인 네트워크로부터 측정하여 트래픽을 모델링하고, 비교분석하므로서 다양한 데이터를 지원하는 초고속 네트워크의 성능분석에 적용할 수 있으리라 여겨진다.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2002년도 춘계종합학술대회
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• pp.104-107
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• 2002

네트워크 트래픽의 연구 동향은 LAN, WAN 및 VBR 비디오 트래픽이 통계학적으로 자기유사과 정에 의해 더욱 더 잘 모델링화 된다는 사실을 입증하고 있다. 이것은 기존의 단기간 의존성만을 고려한 포아손 과정에 비해 다른 이론적 특성을 가진다. 즉 광범위한 시계열상에서 aggregation의 정도가 변하더라도 통계학적으로 동일한 특성을 지니게 된다는 것이 다. 본 논문에서는 이러한 자기유사과정을 갖는 데이터를 실시간 운영중인 네트워크로부터 측정하여 트래픽을 모델링하고, 비교분석하므로서 다양한 데이터를 지원하는 초고속 네트워크의 성능분석에 적용할 수 있으리라 여겨진다.

• 대한수학회지
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• 제41권5호
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• pp.933-944
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• 2004

Packing dimension of a set is an upper bound for the packing dimensions of measures on the set. Recently the packing dimension of statistically self-similar Cantor set, which has uniform distributions for contraction ratios, was shown to be its Hausdorff dimension. We study the method to find an upper bound of packing dimensions and the upper Renyi dimensions of measures on a statistically quasi-self-similar Cantor set (its packing dimension is still unknown) which has non-uniform distributions of contraction ratios. As results, in some statistically quasi-self-similar Cantor set we show that every probability measure on it has its subset of full measure whose packing dimension is also its Hausdorff dimension almost surely and it has its subset of full measure whose packing dimension is also its Hausdorff dimension almost surely for almost all probability measure on it.

• 대한수학회보
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• 제54권1호
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• pp.215-223
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• 2017

In this paper, we establish results about operators similar to their adjoints. This is carried out in the setting of bounded and also unbounded operators on a Hilbert space. Among the results, we prove that an unbounded closed operator similar to its adjoint, via a cramped unitary operator, is self-adjoint. The proof of this result works also as a new proof of the celebrated result by Berberian on the same problem in the bounded case. Other results on similarity of hyponormal unbounded operators and their self-adjointness are also given, generalizing well known results by Sheth and Williams.