• 한국공간구조학회논문집
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• 제16권4호
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• pp.37-44
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• 2016

The seismic isolation system reduces the seismic vibration that is transmitted from foundation to upper structure. This seismic isolation system can be classified into base isolation and mid-story isolation by the installation location. In this study, the seismic behavior of dome structure with mid-story isolation is analyzed to verify the effect of seismic isolation. Mid-story isolation is more effective than base isolation to reduce the seismic responses of roof structure. Also, this isolation would be excellent in structural characteristics and construction.

• Earthquakes and Structures
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• 제15권4호
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• pp.411-417
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• 2018

To solve the seismic response problem of a vertical floating roof tank with base isolation, the floating roof is assumed to experience homogeneous rigid circular plate vibration, where the wave height of the vibration is linearly distributed along the radius, starting from the theory of fluid velocity potential; the potential function of the liquid movement and the corresponding theoretical expression of the base shear, overturning the moment, are then established. According to the equivalent principle of the shear and moment, a simplified mechanical model of a base isolation tank with a swinging effect is established, along with a motion equation of a vertical storage tank isolation system that considers the swinging effect based on the energy principle. At the same time, taking a 150,000 m 3 large-scale storage tank as an example, a numerical analysis of the dampening effect was conducted using a vibration mode decomposition response spectrum method, and a comparative analysis with a simplified mechanical model with no swinging effect was applied.

• Earthquakes and Structures
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• 제19권2호
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• pp.103-117
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• 2020

The effect of the foundation size on the efficiency of seismic base isolation using a layer of stone pebbles is experimentally investigated. Four scaled models of buildings with different stiffnesses (from very stiff to soft) were tested, each with the so-called small and large foundation, and exposed to four different accelerograms (different predominant periods and durations). Tests were conducted so that the strains in the model remained elastic and afterwards the models were tested until collapse. Each model was tested for the case of the foundation being supported on a rigid base and on an aseismic layer. Compared to the smaller foundation, the larger foundation results in a reduced rocking effect, higher earthquake forces and lower bearing capacity of the tested models, with respectable efficiency (reduced strain/stress, displacement and increase of the ultimate bearing capacity of the model) for the considered seismic base isolation compared to the foundation on a rigid base.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2005년도 추계학술대회 논문집 Vol.18
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• pp.91-92
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• 2005

The electromagnetic coupling effect in standard CMOS process is simulated and evaluated. EM coupling transfer characteristic between planar spiral inductors by isolation methode in standard CMOS have simulated and measured. Measurement results show that suppression of EM coupling effect by ground guardring. The evaluated structures are fabricated 1P5M(one poly, five metal) 0.25um standard CMOS process. These measurement results provide a isolation design guidelines in standard CMOS process for Rf coupling suppression.

• 전기학회논문지
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• 제67권12호
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• pp.1648-1656
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• 2018

The configuration of redundant inertial sensors are very important when considering navigation performance and fault detection and isolation (FDI) performance. By constructing a redundant sensor system using multiple inertial sensors, it is possible to improve the navigation performance and fault detection and isolation performance, which are highly related to the sensor configuration and allocation. In order to deploy multiple MEMS inertial measurement units effectively, a configuration and allocation methods considering navigation performance, fault detection and isolation performance, and lever arm effect in one plane are presented, and the performance is analyzed through simulation in this research. From the results, it is confirmed that the proposed configuration and allocation method can improve navigation, FDI, and lever arm effect rejection performances more effectively by more than 70%.

• 사회복지연구
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• 제48권2호
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• pp.143-171
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• 2017

다차원적인 사회적 고립은 신체적 정신적 건강 및 조기사망률과 밀접한 관계가 존재한다. 본 연구에서는 농촌 노인의 연령집단별 건강의 이슈 중 급속한 고령화로 인해 사회문제로 대두되고 있는 치매 발병과 객관적 주관적 사회적 고립의 상대적 영향력을 나타내는 주효과와 상호작용효과를 이항로지스틱회귀분석을 통해 살펴보았다. 분석자료는 다차원적인 사회적 고립 개념의 특성과 치매발병의 다양한 위험요인들을 충실히 반영하고 있는 KSHAP 1차년도 자료를 활용하였다(N=814). 분석결과, 선행연구에서 지적되어 온 다양한 치매발병 위험요인(심리사회적 병리적 건강행동 스트레스 및 인구사회적 변수 등)을 통제한 상태에서 전기노인의 경우 치매 발병에 객관적 사회적 고립의 주효과가 유의미한 영향이 존재한 반면, 후기노인의 경우 주관적 사회적 고립의 주효과가 치매 발병 확률을 높이는 것으로 나타났다. 정리하자면 치매발병과 관련한 객관적 주관적 사회적 고립의 상대적인 영향력은 전기노인과 후기노인에 따라 다르게 나타났다. 한편 치매발병에 대한 객관적 주관적 사회적 고립의 상호작용효과는 전기노인과 후기노인 모두 유의미하게 나타나지 않았다. 본 연구결과에 기초하여 농촌 노인 대상 객관적 주관적 사회적 고립 완화를 통한 치매 예방 및 최근 관심이 고조되고 있는 치매친화지역사회(dementia-friendly communities) 조성과 관련한 시사점에 대해 논의하였다.

• 대한건축학회논문집:구조계
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• 제36권1호
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• pp.137-146
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• 2020

In this study, various application schemes of seismic isolation system which can be applied to Hanok have been studied by analyzing its structural characteristics under seismic load. Structural stability of Hanok is more required against seismic load as Hanok becomes long-spanned and multi-storied. To meet this goal, it becomes necessary to study more advanced technology such as seismic isolation design as well as seismic control design and seismic resistant design suitable to Hanok. Seismic isolation systems have been successfully applied to RC and steel structures to improve structural performance during earthquakes. Based on these previous study, we proposed four application schemes of seismic isolation design suitable for Hanok and analyzed their structural characteristics and applicability to Hanok in conceptual level based on its structural characteristics. The proposed four schemes are base isolation method, ground isolation method, roof isolation method and intermediate-story isolation method. The applicability of the proposed method was evaluated by performing boundary nonlinear dynamic analysis to the typical Hanok for the two types of isolation method, that is, ground isolation method and roof isolation method, and the results showed that the proposed methods produced good performance enough to be applied to Hanok.

• 의료ㆍ복지 건축 : 한국의료복지건축학회 논문집
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• 제22권4호
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• pp.79-86
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• 2016

Purpose: The purpose of this study is to identify the effect of Progressive Space Organization (ante-rooms) in Negative Pressured Isolation Unit(NPIU) such as National and Regional Isolation Units in Korea in order to build basic data for the evidence based design of Airborne Infection Isolation Units which should prepare and respond effectively to the public health crisis due to the hazardous airborne infectious disease. Methods: 1) Gas(SF6) test and analysis on the 23 Korean Isolation Units under operation. 2) Assessment of the isolation level of the space components by checking the Gas concentration. 3) Analysis of the Isolation Effectiveness according to Space Organizational levels. Results: 1) The higher segregation level is, the lower Gas(SF6) concentration is. 2) Too many segregations(anterooms) of Isolation Unit are not efficient for the prevention of infectious bacillus spread. For example, 4 level of segregation has similar segregation effect to the 3 level of segregation. Implications: Many anterooms in front of the isolated patient bedroom will guarantee the safe environment against the danger of hazardous airborne nosocomial infection. On the other hand, too many segregations is inefficient, expensive, inconvenient, narrow(unflexible) and so on. This study can be used as basic data for further development of design guidelines of isolation units.

• 산업기술연구
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• 제21권A호
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• pp.221-229
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• 2001

The effect of Mo underlayer on the magnetic properties of CoCrTa/Cr films deposited on glass substrates were investigated. The coercivity increased and the coercivity squareness decreased by introducing Mo underlayer. The coercivity increase was attributed to the increase of in-plane c-axis orientation and magnetic isolation of Co grains deposited on Cr/Mo underlayer. The decrease of coercivity squarenesses seemed to be caused by the increase of magnetic isolation. The increase of magnetic isolation of Co grains was attributed to the diffusion of Mo atoms into grain boundaries of Co films and the physical isolation of Co grains. The coercivity of CoCrTa/Cr/Mo showed maximum values at Mo thickness of $400{\AA}$. The appearance of the maximum coercivity at that thickness was attributed to the development of strong $Co(10{\bar{1}}0)$ and $Co(10{\bar{1}}1)$ preferred orientation.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 1999년도 하계종합학술대회 논문집
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• pp.911-913
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• 1999

Shallow Trench Isolation (STI) has become the most promising isolation scheme for ULSI applications. The stress of STI structure is one of several factors to degrade characteristics of a device. The stress contours or STI structure vary with the trench depth. Isolation characteristics of STI was analyzed as the depth of trench varied. And transistor characteristics was compared. Isolation punch-through voltage for n$^{＋}$ to pwell and p$^{＋}$ to nwell increased as trench depth increased. n$^{＋}$ to pwell leakage current had nothing to do with trench depth but n$^{＋}$ to pwell leakage current decreased as trench depth increased. In the case of transistor characteristics, short channel effect was independent on trench depth and inverse narrow width effect was greater for deeper trenches. Therefore in order to achieve stable device, it is important to minimize stress by optimizing trench depth.