• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 2009년도 추계학술대회 논문집
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• pp.254-258
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• 2009

In this paper, the low frequency vibration forming system is developed for micro-patterns formation on the metal substrate. many researchers have studied about micro-forming technologies such as micro deep drawing, press forming, forging, extrusion etc. for the formation of precise micro-patterns on the surface of metal substrates, multi-step forming process must be used to improve qualifies of the deformed patterns. Since the low frequency vibration forming system could easily deform the surface of metal substrates, several steps of multi-step forming process should be removed by using the low frequency vibration forming system. In order to find optimal process conditions, we have carried out low frequency vibration forming process with varying the vibration frequency from 110Hz to 500Hz.

• 한국HCI학회:학술대회논문집
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• 한국HCI학회 2008년도 학술대회 1부
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• pp.256-261
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• 2008

본 연구에서는 모바일 기기에서의 진동 패턴을 손쉽고 빠르게 디자인 할 수 있는 저작도구를 개발하였다. 개발한 진동 패턴 디자인 저작 도구는 드래그-앤-드랍 저작 방식을 통해서 손쉽고 빠르게 진동 패턴을 디자인 할 수 있으며, 만들어진 진동 패턴을 데이터베이스에 등록하여 관리함으로써 진동 패턴의 재사용성을 높이고, XML 형식을 통해 진동 패턴을 저장하므로 진동 패턴 데이터 형식의 확장성이 뛰어나다. 또한, 다수의 진동자를 사용하는 환경을 위해 멀티 채널 진동 패턴을 디자인 할 수 있으며, 내부 플레이어를 통해서 진동 패턴을 빠르게 검증하며 수정할 수 있고, 사용자의 인지 모델을 고려한 진동 렌더링방법을 통해서 디자인 할 때 고려한 인지적 효과별 사용자가 통일하게 느낄 수 있게 하였다. 진동 패턴 저작 도구는 기본적으로 모바일 기기에서 진동 모터를 사용하는 환경에 적합하도록 개발되었으나 가상 현실이나 햅틱 인터랙션과 같은 진동 모터를 사용하는 연구 분야에도 적용하여 사용할 수 있다.

• 한국소음진동공학회논문집
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• 제17권9호
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• pp.785-796
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• 2007

This study offers a design procedure of optimum cable damper for multi-mode vibration control with nonlinear damper and also investigates the relation between mode and amplitude dependency. The proposed multi-mode damping index, which is defined as a potential energy loss ratio of cable vibration, is a main component of optimization problem of optimum nonlinear damper. In order to include the amplitude dependency of nonlinear damper, three types of multi-mode patterns such as ambient vibration, support excitation and rain-wind induced vibration are assumed. The optimum damper exponent depends on amplitude patterns. In case of ambient vibration, optimum factor is less than 0.5 and in case of support excitation or rain-wind induced vibration it is between 0.5 and 1.0.

• 전기의세계
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• 제26권5호
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• pp.74-82
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• 1977

This study is to present a method for reductin of noise and vibration of home electric motors coupled to the mechanical load causing relatively big amplitude of vibration. The noise and vibration factors have been analysed in the divisions such as the pattern related to the armature reaction, the pattern related to the circulating current by induction and the other patterns those are affected by a dditive magnetic field and have an effect on mechanical constants. From the systematic mutual relations between the patterns and daping effects, it is possible to derive the fundamental measure for reduction of noise and vibration. Vibration measurements and analysis were carried out in accordance with the planned experimentation and thre object model was chosen randomly from the production line in a factory where home electric machines were mass-produced. Based on the above-mentioned fundamental measure, suppression effects on noise and vibration have been analysed according to the number of slots, the amount of rotor skew and the way the stator winding connection was series or parallel.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2007년도 춘계학술대회논문집
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• pp.147-156
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• 2007

This study offers a design procedure of optimum cable damper for multi-mode vibration control with nonlinear damper and also investigate the relation between mode and amplitude dependency. The proposed multi-mode damping index, which is defined as a energy loss ratio of cable potential, is a main component of optimization problem of optimum nonlinear damper. In order to include the amplitude dependency of nonlinear damper, it is assumed to exist three kinds of multi-mode patterns such as ambient vibration, support excitation and rain-win induced vibration. The optimum damper exponent depends on amplitude patterns. In case of ambient vibration, optimum factor is less than 0.5. In case of support excitation or rain-wind induced vibration is between 0.5 and 1.0. In this study, the effects of cable sag and inclination angle are included in the asymptotic design equation of damped cable structures.

• 한국철도학회:학술대회논문집
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• 한국철도학회 1998년도 추계학술대회 논문집
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• pp.329-336
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• 1998

The characteristics of vibration and sound signals which occurs at the driving system of electric train are investigated in this study since the vibration of driving system is one of the main sources of vibration and sound in electric train. The vibration signals are changed its signal patterns during the transmission from the source to passengers due to noise or several unknown factors. To avoid the complexity of actual signals of electric train, signals from experimental apparatus of motor/gear driving system are analyzed to find the appropriate method of analysis and to characterize the signal patterns. The used methods are waterfall diagram, transfer function and modal analysis. The results shows that the vibration signals are usually originated from motor bearing and gear meshing and these signals are transmitted to bottom or bogie. Also, the sound signal is similar to the vibration of bottom or bogie, but it is not so clear to figure out the source of vibration.

• 한국정밀공학회지
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• 제28권3호
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• pp.363-369
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• 2011

In this study, a direct pattern forming process on a plastic film using ultrasonic vibration energy is investigated. A tool horn containing micro-patterns is attached to an ultrasonic power supply, and is used to press a plastic film with ultrasonic vibration in order to replicate micro-patterns on the surface of the plastic film. To replicate micro-patterns with high accuracy, the tool horn should be designed to allow only the longitudinal vibration, not the transverse vibration. For this purpose, the design of a tool horn is investigated through finite element analysis, from which the resulting natural frequency of the tool horn can be adjusted in the range of the ultrasonic power supply. The analysis result is then reflected on the optimal design and fabrication of the tool horn. The validity of the developed tool horn is discussed through pattern-forming experiments using the ultrasonic vibration of the developed tool horn.

• 대한기계학회논문집A
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• 제37권3호
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• pp.413-418
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• 2013

본 연구에서는 진동모터의 진동패턴을 설계하고 평가하는 시스템을 제안하여 촉감을 통해 더욱 풍부한 정보를 습득할 수 있는 방법을 제안하였다. 시스템은 진동패턴을 설계하고 평가할 수 있는 컴퓨터 프로그램과 진동패턴을 촉감으로 확인할 수 있는 진동촉감 제시장치로 구성된다. 프로그램에서는 설계자가 진동패턴을 직관적으로 설계할 수 있는 시각적 설계도구와 재생기능을 제공하며 설계된 진동패턴의 재생을 통해 평가자가 진동패턴이 어떠한 기능을 나타내고 있는지 선택할 수 있는 평가기능을 제공한다. 진동촉감제시장치는 프로그램으로부터 전송된 진동패턴 정보를 진동모터로 구동시켜 설계결과를 실제 촉감으로 확인 할 수 있는 기능을 제공한다. 개발한 시스템을 통해 스마트폰과 자동차 오디오에서 대표적으로 사용되는 기능들에 대한 진동패턴 설계 및 평가를 진행하여 평가정보가 설계에 피드백 되는 방법과 높은 평가채택률을 획득한 진동패턴들을 분석하여 진동패턴 설계 지침을 제시하였다.

• 화약ㆍ발파
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• 제28권1호
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• pp.11-18
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• 2010

본 고에서는 기존 미진동파쇄기류(미진동파쇄기, 플라즈마 등)의 단점인 시공성 및 경제성을 개선하고, 발파진동을 최소화한 미진동화약(NewFINECKER)의 개발 및 현장적용 사례를 소개하였다. 이 미진동화약은 국토해양부 표준발파패턴중(中) Type-1(미진동굴착공법, 125g 미만의 폭약 사용)에 부합하며, 지발발파가 가능하고, 시공성 및 작업효율을 대폭 개선하는 반면 진동수준은 일반 에멀젼폭약(NewMITE)의 약 60~70% 수준으로 나타났다. 추가적으로 현장 적용시 표준발파패턴, 발파진동추정식, 시공방법 등을 본 연구에 제시하였다.

• Genomics & Informatics
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• 제10권2호
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• pp.128-132
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• 2012

To learn the differences between the structure-activity relationship and molecular vibration-activity relationship in the ligand-receptor interaction of the histamine receptor, 47 ligands of the histamine receptor were analyzed by structural similarity and molecular vibrational frequency patterns. The radial tree that was produced by clustering analysis of molecular vibrational frequency patterns shows its potential for the functional classification of histamine receptor ligands.