• East Asian Economic Review
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• 제19권1호
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• pp.99-114
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• 2015

What explains the sharp increase in the Chinese economy's indebtedness, in particular the China's onshore corporate debt? Has the overall debt burden reached a threshold where it poses a systemic risk, thereby making the economy vulnerable to a "Lehman Moment" - with disorderly unwinding of the private sector and sovereign debt? What are the short and longer term implications of China's growing debt problems on domestic economic growth and the broader global political economy? What has Beijing done to ameliorate the problem, how effective were its efforts, and what must it do to deal with this problem?

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2003년도 하계종합학술대회 논문집 Ⅳ
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• pp.2076-2079
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• 2003

This paper describes an efficient thresholding method for the binarization of a grey-level letter image. This method determines the adaptive threshold for letter image binarization by introducing the readjusting parameter, based on the global variance of the input image. Experimental results show that the proposed binarization method outperforms on the various letter images with a texture or noise when compared to the other methods.

• Genomics & Informatics
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• 제3권2호
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• pp.52-54
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• 2005

Visualization of the homology information is an important method to analyze the evolutionary and functional meanings of genes. With a database containing model genomes of Homo sapiens, Mus muculus, and Rattus norvegicus, we constructed a web­based comparative analysis tool, BioCovi, to visualize the homology information of mammalian sequences on a very large scale. The user interface has several features: it marks regions whose identity is greater than that specified, it shows or hides gaps from the result of global sequence alignment, and it inverts the graph when total identity is higher than the threshold specified.

• 대한기계학회논문집
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• 제18권6호
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• pp.1542-1550
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• 1994

For a class of singularly perturbed uncertain system, an output feedback control law is designed. The controller structure is designed based on the uncertain reduced-order system, and the controller parameters are determined by information on the reduced-order and full-order systems. It has been shown that the reduces-order system with the designed controller possesses a stability property(specifically, a global uniform attractivity). Furthermore, the stability property of this control scheme is robust with respect to singular perturbation ; i.e., the full-order system, subject to the same controller, possesses the global uniform attractivity, provided the singular perturbation parameter $\mu<\mu^{*}$, where a threshold value $\mu^{*}$ can be computed from the information available on the full-order system.

• 한국지능시스템학회:학술대회논문집
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• 한국퍼지및지능시스템학회 2002년도 추계학술대회 및 정기총회
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• pp.333-336
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• 2002

This paper presents a new image segmentation method using fuzzy measures which reflect the local property of an image as well as the global property of an image An image is globally segmented into the crisp region and the ambiguous region in terms of the Index of fuzziness measured over all pixels of an image. The ambiguous region is luther partitioned into background and object in terms of the index of fuzziness computed over the set of neighboring pixels reflecting the local property most. From the experimental results, this method shows the effective ambiguity handling capability in segmenting an image.

• 한국수학교육학회지시리즈B:순수및응용수학
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• 제30권2호
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• pp.203-220
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• 2023

A new modification of the SIS epidemic model incorporating the adaptive host behavior is proposed. Unlike the common situation in most epidemic models, this system has two disease-free equilibrium points, and we were able to prove that as the basic reproduction number approaches the threshold of 1, these two points merge and a Bogdanov-Takens bifurcation of codimension three occurs. The occurrence of this bifurcation is a sign of the complexity of the dynamics of the system near the value 1 of basic reproduction number. Both local and global stability of disease-free and endemic equilibrium point are studied.

• Geomechanics and Engineering
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• 제10권2호
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• pp.175-188
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• 2016

The construction of a new cavern modifies the state of stresses and displacements in a zone around the existing cavern. For multiple caverns, the size of this influence zone depends on the ground type, the in situ stress, the cavern span and shape, the width of the pillar separating the caverns, and the excavation sequence. Performances of underground twin caverns can be unsatisfactory as a result of either instability (collapse) or excessive displacements. These two distinct failures should be prevented in design. This study simulated the ultimate and serviceability performances of underground twin rock caverns of various sizes and shapes. The global factor of safety is used as the criterion for determining the ultimate limit state and the calculated maximum displacement around the cavern opening is adopted as the serviceability limit state criterion. Based on the results of a series of numerical simulations, simple regression models were developed for estimating the global factor of safety and the maximum displacement, respectively. It was proposed that a proper pillar width can be determined based on the threshold influence factor value. In addition, design charts with regard to the selection of the pillar width for underground twin rock caverns under similar ground conditions were also developed.

• 한국컴퓨터정보학회논문지
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• 제22권1호
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• pp.1-7
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• 2017

In this paper, we propose an efficient method that is tracking an object in real time using particle filter and adaptive observation model. When tracking object, it happens object shape variation by camera or object movement in variety environments. The traditional method has an error of tracking from these variation, because it has fixed observation model about the selected object by the user in the initial frame. In order to overcome these problems, we propose a method that updates the observation model by calculating the similarity between the used observation model and the eight-way of edge model from the current position. If the similarity is higher than the threshold value, tracking the object using updated observation model to reset observation model. On the contrary to this, the algorithm which consists of a process is to maintain the used observation model. Finally, this paper demonstrates the performance of the stable tracking through comparison with the traditional method by using a number of experimental data.

• 한국통신학회논문지
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• 제35권7B호
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• pp.1081-1090
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• 2010

본 논문에서는 900MHz 대역 RFID 수동형 태그 전치부를 설계 및 구현하고 측정을 통해 검증하였다. 문턱전압(threshold voltage) 제거 회로 구조의 전압 체배기, 전류를 이용한 복조 회로, 온도 및 공정 보상회로를 포함한 EPC Global Class-1 Generation-2 UHF RFID 프로토콜에 만족하는 클록 발생기 구조로 주요 블록을 설계하였으며, 전력차단 회로를 추가하여 동작의 안정성에 중점을 두었다. PWM(Pulse Width Modulation)을 이용한 변조기 구조로 입력단의 용량성 임피던스 부하 변조 방식을 이용하여 변조 동작을 검증하였다. 성능 검증을 위해 평가 보드에 CPLD(Complex Programmable Logic Device)를 삽입하여 디지털 신호 처리부의 기능을 통해 기본적인 태그 명령을 처리할 수 있도록 하여 설계된 태그 칩과 더불어 전체 태그 동작을 검증하였다. 삼성 0.18um CMOS 공정을 이용하여 설계하였고, 인식거리는 1.5m내에 안정적인 동작이 가능하다. 15~100% 변조율의 신호를 복조하며, 온도 및 공정에 변화에 대해 9.6% 이하의 오차를 가진 클록을 생성하였으며, 1m 거리에서 평균 소모전력은 약 71um이다.

• 한국멀티미디어학회논문지
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• 제12권10호
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• pp.1418-1426
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• 2009

주어진 배경 이미지로부터 전경 객체를 분리하는 것을 목표로 하는 배경 차분화 기법에 관한 많은 연구가 있어 왔다. 최근에 발표된 몇 가지 통계 기반 배경 차분화 기법들은 동적인 환경에서 동작할 수 있을 정도로 안정된 성능을 보이는 것으로 보고되고 있다. 그러나 이들 기법은 일반적으로 매우 많은 계산 자원을 요구하며, 객체의 명확한 윤곽을 획득하는데 있어서는 아직 어려움이 있다. 본 논문에서는 점진적으로 변화하는 배경을 모델링하기 위해 복잡한 통계 기법을 적용하는 대신 간단한 이동-평균 기법을 사용한다. 또한 픽셀별로 할당되는 다중의 임계치 대신 유전자 학습에 의해 최적화되는 하나의 전역적 임계치를 사용한다. 유전자 학습을 위해 새로운 적합도 함수를 정의하여 학습하고 이를 이용하여 이미지의 분할 결과들을 평가한다. 본 논문의 시스템은 웹 카메라가 장착된 개인용 컴퓨터에서 구현하였으며, 실사 이미지들에 대한 실험 결과에 의하면 기존의 가우시안 믹스쳐 방식보다 우수한 성능을 보이는 것으로 나타났다.