• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2005년도 춘계학술대회논문집
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• pp.413-418
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• 2005

Vibration test using the MAST(Multi Axial Simulation Table) is more reliable test than conventional testing process focused on one directional vibration test. The former test could be possible with a advanced control algorithm and hardware supports so that most of the operation is automatically conducted by MAST system itself except the input information that is derived from the measured data. That means the reliability of the vibration test is highly depended on the input profile than any other cases before. In this paper, the optimal algorithm based on energy method is introduced so that the best combination of candidated input PSD data could be constructed. The optimal algorithm renders time information so that the vibration fatigue test is completely possible for any measured signals one wants. The real road test is conducted in short intervals containing some rough roads and the candidated input PSD is obtained from the extra road in proving ground. The testing is targeted for the electronically operated door and seat.

• 한국산업정보학회논문지
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• 제19권3호
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• pp.115-125
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• 2014

This paper has two purposes. The first is to suggest the new and simple method to derive a regional input-output model from the national input-output table published by the Bank of Korea. The interregional input-output table has not been devised in spite of its potential use while the national table has been made every five years with the revised version during each five years. Second, this paper aims to derive Kangwon interregional input-output model from the national model using the regional supply proportion of industry and to analyze the effect of medical tourism industry on the regional economy of Kangwon Province. The paper measures, in particular, the effect of medical tourism industry on the financial self-sufficiency of Kangwon Province using the estimated output elasticity of tax revenue with the autoregressive distributed lag scheme ADL(1,1) in which the dependent variable and the single explanatory variable are each lagged once.

• 산업공학
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• 제24권3호
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• pp.210-219
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• 2011

The traditional AHP(Analytic Hierarchy Process) is to evaluate subjectively the alternatives in the view point of each of criteria and has been widely used at the fields of real world application. The AHP has some drawbacks that makes it difficult to keep the consistency of decision makers' input and take too long to get accurate results because of requiring lots of pairwise comparison between criteria and alternatives. This research is to propose and develop a Hybrid-AHP system for complementing the critical points of traditional AHP methodologies. This system gets the quantitative information as well as qualitative inputs as the comparative ones between criteria and alternatives. We use the input as various type of information such as quantitative values, 9-scale ratings, and fuzzy-based inputs. Finally, we applied the system to the case of choosing strategic industries. The case study have shown the use of various input methods saves processing time, and reduces the input burden of users.

• Journal of Mechanical Science and Technology
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• 제19권11호
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• pp.1975-1987
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• 2005

An input time delay always exists in practical systems. Analysis of the delay phenomenon in a continuous-time domain is sophisticated. It is appropriate to obtain its corresponding discrete-time model for implementation via digital computers. In this paper a new scheme for the discretization of nonlinear systems using Taylor series expansion and the zero-order hold assumption is proposed. The mathematical structure of the new discretization method is analyzed. On the basis of this structure the sampled-data representation of nonlinear systems with time-delayed multi-input is presented. The delayed multi-input general equation has been derived. In particular, the effect of the time-discretization method on key properties of nonlinear control systems, such as equilibrium properties and asymptotic stability, is examined. Additionally, hybrid discretization schemes that result from a combination of the scaling and squaring technique (SST) with the Taylor series expansion are also proposed, especially under conditions of very low sampling rates. Practical issues associated with the selection of the method's parameters to meet CPU time and accuracy requirements, are examined as well. A performance of the proposed method is evaluated using a nonlinear system with time delay maneuvering an automobile.

• 한국정보처리학회논문지
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• 제7권4호
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• pp.1246-1264
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• 2000

An input-output buffering switch operates in either of tow different cell loss modes; Backpressure mode and Queueloss mode. In the previous studies, the Backpressrue mode is more effective at low traffic loads, and the Queueloss mode performs better at high traffic. We propose a new operation mode, called Hybrid mode, which adopts the advantages of he Backpressure and the Queueloss mode. Backpressure and Queueloss modes are distinguished from whether a cell loss occurs at the output buffer or not when output buffer overflows, irrespective of input buffer status. In order to simply combine Backpressure and Queueloss mode, the change of input traffic load must be measured. However, in the Hybrid mode, simply both of the input and output buffer overflow and checked out to determine the cell discard. The performance of the Hybrid mode is compared with those of the Backpressure and the Queueloss mode under random and bursty traffic. This paper show that the Hybrid mode always gives the best performance results for most ranges of load values.

• 한국산학기술학회논문지
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• 제8권3호
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• pp.535-540
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• 2007

사용자 인터페이싱 환경을 위한 경제적인 입력 방법으로 핸드 인식기술이 널리 이용되고 있다. 그러나, 대부분의 기법들은 고정된 배경과 정해진 패턴만을 인식하는 제한점을 가진다. 이러한 제한점은 수행환경의 제약과 다양한 응용분야에 적용하기 어렵다는 문제점을 가진다. 본 논문에서는 배경의 제약 없이 핸드 영역정보와 위치정보를 추출하여 입력 장치를 구동시키는 가상입력시스템을 제안한다. 본 연구는 개방 환경에서 사람의 입력을 요구하는 공항이나 전시관의 키오스크 시스템, 각종 조정장치 및 산업용 시스템분야에 경제적인 가상입력시스템으로 사용될 수 있을 것이다.

• 한국통신학회논문지
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• 제33권11B호
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• pp.1020-1029
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• 2008

본 논문은 네트워크 침입 탐지 시스템에서 고속 패턴 매칭 알고리듬과 그 구조를 제안한다. 제안된 알고리듬은 실시간 입력 패킷에서 특정 패턴을 검사하며 정확한 문자열, 문자열 값의 범위, 그리고 문자열 값의 조합 등을 검색한다. 본 연구에서는 입력 패킷과 패턴은 동시에 겹치는 문자열들을 검색하기 위해 상태 전이 그래프로 모델링 하였으며 상태 전이 그래프는 구현 복잡도를 줄이기 위해 입력 임플리컨트 단위로 분할하였다. 제안된 패턴 매칭구조는 상태 전이 그래프와 입력된 문자열을 입력으로 사용한다. 제안된 패턴 매칭기는 VHDL 언어로 모델링하여 구현하였으며, 성능 분석을 통하여 제안된 기법의 적절성을 검증하였다.

• 한국소음진동공학회논문집
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• 제15권9호
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• pp.1070-1076
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• 2005

Vibration test using the MAST(multi axial simulation table) provide a more reliable testing environment than any conventional one. The multi axial simulation could be possible with a advanced control algorithm and hardware supports so that most of the operation is automatically conducted by MAST system itself except the input information that is synthesized by the measured response signals. That means the reliability of the vibration test is highly depended on the quality of the input profile. In this paper, the optimal algorithm based on the energy method is introduced to construct a best combination of candidated input PSD data could be constructed. Since the optimal algorithm renders time information, the nitration fatigue test is completely possible for any measured signals one wants. The proposed method is explained with representing acquired road signals from the candidate input PSD obtained from a proving ground.

• 인터넷정보학회논문지
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• 제8권6호
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• pp.145-153
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• 2007

최근의 정보기술 동향은 모바일 서비스를 중심으로 발전해 가고 있으며, 대부분의 휴대폰 이용자들이 통화뿐만 아니라 무선 인터넷을 통해 제공되는 다양한 서비스를 이용하고 있다. 다양한 응용 서비스를 가능하게 해주는 시스템 소프트웨어 및 미들웨어의 중요성이 더욱 확대되고 있으며, 그 중 하나가 문자 입.출력 시스템이다. 본 논문에서 제안한 입력 시스템은 해당 언어의 생성원리를 기반으로 알파벳을 분해하여 글 쓰듯이 입력하는 필획(Stroke) 방식으로 구성하여, 언어를 알고 있는 사람이면 누구나 쉽게 입력할 수 있도록 개발하였다.

• 한국정보통신학회논문지
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• 제2권1호
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• pp.117-124
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• 1998

본 논문은 입력 버퍼링 구조를 갖는 패킷 스위치에서 윈도우 방식을 이용하는 스위치 성능 개선 구조가 윈도우의 크기를 충분히 크게 하여 성능을 개선할 수 있으나 버스트성 트래픽에 대해서는 충분한 윈도우의 효과를 얻을 수 없는 단점을 개선하기 위하여 버스티 단위로 윈도우를 적용하는 BHA-FIFO 입력 버퍼 구조를 제안한다. 제안된 BHA-FIFO의 성능 분석 연구를 통하여 일반적인 FIFO를 사용하는 윈도우 방식의 스위치 성능은 버스트 길이가 커질 수록 감소하여 최대 처리율이 0.5에 수렴하지만 버스트 단위로 윈도우를 갖는 BHA-FIFO 구성에서는 같은 윈도우 크기에 대하여 제안된 BHA-FIFO 스위치의 성능이 우수하게 개선되었다.