• Journal of the Institute of Electronics Engineers of Korea SD
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• v.45 no.6
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• pp.43-48
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• 2008

Power consumption during test can be much higher than that during normal operation since test vectors are determined independently. In order to reduce the power consumption during test process, a new BIST(Built-In Self Test) architecture is proposed. In the proposed architecture, test vectors generated by an LFSR(Linear Feedback Shift Resister) are transformed into the new patterns with low transitions using Bit Generator and Bit Dropper. Experiments performed on ISCAS'89 benchmark circuits show that transition reduction during scan testing can be achieved by 62% without loss of fault coverage. Therefore the new architecture is a viable solution for reducing both peak and average power consumption.

• Geotechnical Engineering
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• v.14 no.1
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• pp.81-92
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• 1998

Coal ash from thermal power plants has been produced in large quantity and discarded uselessly, However, it is possible to supply construction material properly by utilizing the coal ash as construction material. In this study, the applicable model and its applicability for deformation analysis of coal ash fill and reclamation ground are studied. Camflay model gives complete constitutive law which illustrates deformation and pore water pressure while soil is loaded under the various stresses at drained and undrained conditions. The merit of proposed model which is acquired from laboratory tests is that only a few soil parameters are available. The whole parameters of Camflay model are obtained by typical mechanical test and CV triaxial test on the sample with optimum mixing ratio( i.e. fly ash : bottom ash=5:5) Then the results from proposed numerical analysis are compared with laboratory results. The differences between laboratory test and numerical analysis are negligible. Parameters deter mined from laboratory tests are useful as a basic data for deformation analysis of coal ash reclamation ground using Camflay model.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.42 no.4
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• pp.501-508
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• 2022

Required essential technique is to determine the maximum recharge pressure in the well with condition of non-ground failure for the recovery of the groundwater. Based on the classical soil mechanics, the maximum recharge pressure was estimated with the numerical anlaysis and laboratory triaxial test. In the numerical analysis, the maximum recharge pressure is defined as the ground failure stress. The ground failure of the sand was defined as the piping and the one of the caly was to the undrained failure by the confined pressure increment. In the triaxial test, the recharge pressure in the ground was modified by the back pressure in the specimen. In case of sand, the volume strain was dramatically increased at the 93 % of the maximum back pressure, same meaning of the 0 effective stress state. In case of clay, the only radial volume strain was to reached 1.5 % without failure. Therefore, The maximum recharge pressure could be determined with the numerical analysis and triaxial test.

• Geotechnical Engineering
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• v.6 no.4
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• pp.65-74
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• 1990

This paper presents triaxial test (CIVC and CKOUC) results on normally consolidated deep sea clay samples. Based on the test results the pore pressure-strain relations for both isotropicaly and anisotropicaly consgidated samples are expressed with hyperbolic functions of the major princpal strain. The analysis of the difference in pore pressure behavior due to the anisotropy in consolidation stress is carried out with the effective stress pathos of CIVC and CKOUC and finds a factor which correlates the pore pressure of two types of test.

• Proceedings of the Korean Society of Computer Information Conference
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• 2009.01a
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• pp.445-449
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• 2009

인터넷의 발달과 인터넷 문화의 보편화로 인하여 사용자들은 폭발적으로 증가하는 다양한 정보를 접할 수 있게 되었으며, 자체 생산하거나 다른 신문사들로부터 생산된 기사들을 단순 유통, 링크를 통하여 정보검색 사이트들뿐만 아니라 각종 포털 사이트, 인터넷신문사들은 많은 다양한 경로로 기사를 제공할 수 있게 되었다. 이에 따라 인터넷산문을 규정하고 법적, 테두리에 넣기 위한 법률이 제정되었으며, 인터넷신문사에 대해 기사의 자체 생산량이라는 요건 검증에 대한 요구가 증가하고 있다. 본 논문은 인터넷신문 자체기사 생산량을 측정하기 위해 필요한 기술들을 조사하고 타당성을 검토하여 이에 적합한 기술을 제시한다. 제시한 방법은 대량의 기사의 비교를 빠른 시간에 수행한 수 있도록 하기 위해 인간의 단어 인지와 관련한 경험적 정보의 반영을 통하여 변형한 편집거리 기반 방법이다. 제시하는 방법의 정확성을 검증하기 위해 실제 소량의 인터넷 신문 기사를 대상으로 실험하였다.

• Journal of the Korean Geotechnical Society
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• v.17 no.6
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• pp.85-98
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• 2001

Cone penetration was analyzed by arbitrary Lagangian-Eulerian(ALE) method. In order to simulate full penetration, steady state analyses were performed using ABAQUS/Explicit, which models upward flow of soil layers. In the analysis of homogeneous layer it was found that the paths and the strain of soil particles were consistent with the result of the strain path method and that the ultimate resistance were reasonably evaluated. The cone penetration through different soil layers was also analyzed and that showed the transfer of cone resistance. The steady state ALE analysis could perform full penetration through the layered soils.

• Proceedings of the Korean Information Science Society Conference
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• 2002.04a
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• pp.583-585
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• 2002

Mobile Ad Hoc Network에서는 무선으로 연결된 호스트들이 쉽게 이동할 수 있으며 미리 설치된 유선망을 이용하는 셀롤러망과 달리 이동 호스트 사이의 통신만으로 이루어진 망이다. Mobile Ad Hoc Network에서는 각각의 노드들의 이동성이 높기 때문에 이 각각의 노드들의 라우팅 경로를 결정하는 것이 중요하다. 이에 따라 Mobile Ad Hoc Network를 위한 많은 라우팅 프로토콜이 제안되었다. 본 논문에서는 기존에 제안된 Cluster Based Routing Protocol(CBRP)극 변형하여 마치 셀롤러망에서의 셀과 같이 고정된 위치를 하나의 셀로 정의하고 그 하나의 셀이 클러스터를 형성하여 라우팅 오버 헤드를 줄일 수 있는 기법을 제안한다.

• The Journal of the Acoustical Society of Korea
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• v.10 no.6
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• pp.23-42
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• 1991

본 논문은 시스템 운동학적 자유보다도 많은 수의 input을 사용하여 비선형 구속조건을 갖는 메 카니즘의 정역학적 평형을 유지시키는 경우와 같이 일반 로봇 시스템의 협력 작업시 일어나는 antagonistic stiffness를 연구하였다. 이러한 antagonistic 상황은 coordinations of multiple manipulators, multi-fingered end-efector, walking machine, 그리고 인간의 움직임등을 포함하는 많은 로봇 시스템의 작동시에 일어난다. Antagonism으로 야기되는 stiffness는 이러한 시스템의 특성을 파악하는 좋은 척도 가 될 수 있다. Antagonistic stiffness의 개념은 시스템을 구성하는 강체들의 상대 변위의 함수로 얻어 지기 때문에 바강체들이 변형하는 특성을 나타내는 structural stiffness와는 구별된다. 따라서 이 개념은 여유입력들에 의해 얻어지는 시스템의 effective stiffness로 해석될 수 있고, 일반 로봇 mechanism의 개 경로 안정도의 척도로 이용될 수 있으며 목적에 따라서 stiffness의 제어가 가능한 비선형 spring을 만 드는 데에도 응용이 가능하다. 본 논문에서는 antagonism이 일어나는 몇가지 상황에서의 stiffness 특성 과 개경로 안정성 조건등을 해석적, 기하학적 관점에서 다루었다.

• Journal of the Korean Society of Manufacturing Technology Engineers
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• v.9 no.4
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• pp.75-84
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• 2000

The main goal of our research is to compensate the milled surface errors induced by the tool deflection effects, which occur during the milling process. First, we predict cutting forces and tool deflection amount. Based on predicted deflection effects, we model milled surface shapes. We present a compensation methodology , which can generate a new tool trajectory, which is determined so as to compensate the milled surface errors. By considering manufacturing tolerance, tool path compensation is generalized. To validate the approaches proposed in this paper, we treat an illustrative example of profile milling process by using flat end mill. Simulation and experimental results are shown.

• Journal of Advanced Navigation Technology
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• v.7 no.2
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• pp.156-161
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• 2003

In this study, a hybrid navigation system with a low-cost GPS Receiver plus Gyro and Odometer is developed and tested. This hybrid navigation system adopted a modified coupling method which can be distinguished from tightly coupled method or loosely coupled method, so that GPS receivers or Gyros or Odometers can be chosen arbitrary. Comparing to the existing hybrid navigation system, the test results show that this navigation system enhances the accuracy and is robust against the multipath error. It is also proven that this system has an advantage of acquiring GIS data for post processing.