• 한국지진공학회:학술대회논문집
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• 한국지진공학회 2002년도 춘계 학술발표회 논문집
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• pp.51-58
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• 2002

The relative site amplification factors in southern Korea were determined from coda waves using coda normalization method. The seismograms of 15 events at 79 stations were used in this study. Seismogram envelopes were obtained by the Hilbert transform of bandpass-filtered velocity seismograms with frequency bands at 1-2Hz, 2-4Hz, 4-8Hz, 8-l6Hz and 16-32Hz. The envelopes were stabilized by application of moving-average scheme with time window of 1 second. The relative amplitudes of seismogram envelope were computed by dividing the amplitude of seismogram envelope at one site by the amplitude of seismogram envelope at reference site. The relative site amplification factors were obtained by taking averages of the relative amplitude. Values of relative site amplification factors in southern Korea are generally low in western area and high in eastern area.

• 한국전기전자재료학회논문지
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• 제24권3호
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• pp.224-228
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• 2011

This research, integratable capacitive relative humidity sensor was produced using polyimide on glass substrate. Also, at the time of upper electrode formation, upper electrode grain size was affected by giving changes to sputtering condition. Through this analyzing electrical characteristics affect from capacitive relative humidity sensor was possible. Capacitance of capacitive relative humidity sensor was 330 pF, linearity of 0.6%FS and it showed less than 3% of low hysterisis. Specially, hysterisis was affected more from interface than interstitial. Also was affected by the grain size which is one of the formation condition of upper electrode.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2008년도 추계학술대회 논문집
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• pp.1065-1068
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• 2008

Concrete is still one most common construction materials even in railway structures. As structures become massive and mega-sized, the importance of early age concrete quality control becomes more significant. Among various factors, relative humidity and temperature are the primary factors governing the early age quality. Temperature raise due to cement hydration causes stress, which can develop to cracking with internal and/or external restraints. Exposure conditions including ambient temperature, humidity and wind also significantly affect the cracking behavior of early age concrete. Among many of studies on the early age concrete behavior, investigation on the variation of temperature and relative humidity internal of concrete is not common. That is in part because the difficulties in measuring the relative humidity and temperature inside the concrete. This study used a digital sensor with an appropriate logger to measure internal temperature and relative humidity. This direct measuring method is expected to provide more reliable and comprehensive data acquisition on the early age behavior of concrete.

• 한국수자원학회논문집
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• 제36권2호
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• pp.315-324
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• 2003

하천유지유량 설정에 최소한의 기준이 되는 갈수량을 결정하기 위하여 하천유량 자료를 검토하고 확률갈수량을 추정하였다. 확률갈수량은 모수적 방법과 비모수적 방법을 사용하여 산정하였으며, Monte Carlo 모의실험을 통하여 비교·분석하였다. 한강유역 13개 지점의 갈수량에 대한 빈도 해석을 실시한 결과, 유역 전체에 대한 확률분포 형은 3가지 분포형, 즉 2모수 gamma, 2모수 lognormal, 그리고 2모수 Weibull 분포가 한강 전지점의 주요 분포형으로 나타났다. 모집단과 같은 확률분포형의 상대편의와 상대평균제곱근오차가 가장 작게 나타났으며, 내삽범 위에서 비모수적 방법이 통계적 거동특성(상대편의와 상대평균제곱근오차)이 좋은 것으로 나타났다. RRMSE에 있어서 비모수적 방법중에서 PM 기법이 가장 작게 나타났으며, SJ 기법이 비모수적 방법 가운데 가장 크게 나타났다.

• 한국융합학회논문지
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• 제11권3호
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• pp.45-52
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• 2020

본 연구에서는 현존하고 있는 잠금 해제 방식에서 보이는 문제점으로부터 출발해 보안성 및 사용성 측면에서 개선된 블라인드 인터랙션을 적용한 상대적 위치 기반 패턴 잠금 해제 방식을 제안하고 이론적 타당성을 고찰했다. 기존 숫자암호 잠금 해제 방식과 패턴 그리기 잠금 해제 방식과의 차이를 실험을 통해 확인하고 실용적 가치를 평가했다. 상대적 위치 패턴은 숫자 암호 보다 쉽게 기억되고 그리기 패턴과 비슷한 정도의 학습 용이성을 보여 주었고 타 방식에 비해 훔쳐보기 공격에 안전한 결과를 얻었다. 생체신호를 센싱 할 센싱 모듈을 사용할 필요 없이 터치스크린의 기본기능만으로 실현 가능하기에 적은 원가로 제작할 수 있다. 시각적 요소가 필요 없는 방식이기에 시각 장애인과 같은 특수 사용자들도 불편함 없이 사용할 수 있기에 실용적 가치도 상대적으로 높다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제13권4호
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• pp.1845-1865
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• 2019

Current Internet is designed by lots of service providers with different objects and policies which make the direct deployment of radically new architecture and protocols on Internet nearly impossible without reaching a consensus among almost all of them. Network virtualization is proposed to fend off this ossification of Internet architecture and add diversity to the future Internet. As an important part of network virtualization, virtual network embedding (VNE) problem has received more and more attention. In order to solve the problems of large embedding cost, low acceptance ratio (AR) and environmental adaptability in VNE algorithms, cognitive method is introduced to improve the adaptability to the changing environment and a cognitive virtual network embedding algorithm based on weighted relative entropy (WRE-CVNE) is proposed in this paper. At first, the weighted relative entropy (WRE) method is proposed to select the suitable substrate nodes and paths in VNE. In WRE method, the ranking indicators and their weighting coefficients are selected to calculate the node importance and path importance. It is the basic of the WRE-CVNE. In virtual node embedding stage, the WRE method and breadth first search (BFS) algorithm are both used, and the node proximity is introduced into substrate node ranking to achieve the joint topology awareness. Finally, in virtual link embedding stage, the CPU resource balance degree, bandwidth resource balance degree and path hop counts are taken into account. The path importance is calculated based on the WRE method and the suitable substrate path is selected to reduce the resource fragmentation. Simulation results show that the proposed algorithm can significantly improve AR and the long-term average revenue to cost ratio (LTAR/CR) by adjusting the weighting coefficients in VNE stage according to the network environment. We also analyze the impact of weighting coefficient on the performance of the WRE-CVNE. In addition, the adaptability of the WRE-CVNE is researched in three different scenarios and the effectiveness and efficiency of the WRE-CVNE are demonstrated.

• 대한수학회보
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• 제52권4호
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• pp.1149-1167
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• 2015

We get a theorem which shows the existence of at least four $2{\pi}$-periodic weak solutions for the bifurcation problem of the Hamiltonian system with the superquadratic nonlinearity. We obtain this result by using the variational method, the critical point theory induced from the limit relative category theory.

• Korean Journal of Mathematics
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• 제16권1호
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• pp.1-24
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• 2008

Let $Lu=u_{tt}+u_{xxxx}$ and E be the complete normed space spanned by the eigenfunctions of L. We reveal the existence of six nontrivial solutions of a nonlinear suspension bridge equation $Lu+bu^+=1+{\epsilon}h(x,t)$ in E when the nonlinearity crosses three eigenvalues. It is shown by the critical point theory induced from the limit relative category of the torus with three holes and finite dimensional reduction method.

• Communications for Statistical Applications and Methods
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• 제6권2호
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• pp.621-634
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• 1999

Consider the several methods of constructing interval for relative ration from two independent binomial samples. The special interests are gives in the cases of low rates and small samples. bias-corrected and accelerated bootstrap method is proposed to overcome are the non-efficiency of current methods based on asymptotic resuts. Simulation studies are presented to demonstrate the performance of the proposed method.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1996년도 한국자동제어학술회의논문집(국내학술편); 포항공과대학교, 포항; 24-26 Oct. 1996
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• pp.820-823
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• 1996

In contrast to parts of relatively simple shapes, it is important to match their cross-sectional shapes during mating parts of complicated shapes. It requires the 2.pi. information along their matching boundary to figure out their relative geometrical shapes. In this paper, we propose a method measuring a misalignment at the interface during mating parts with the complicated shapes by using the omnidirectional image sensing system(OLSSA). Also we carried out experiments in order to prove the method, and the results show the feasibility.