• 한국정보교육학회:학술대회논문집
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• 한국정보교육학회 2011년도 동계학술대회
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• pp.1-5
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• 2011

디지털 사회로의 변화는 새로운 정보화 능력을 갖춘 인간상을 요구하고 있으며 교육에도 큰 영향을 미치고 있다. 이러한 변화에 발맞추어 디지털 기술이 가진 역동적 상호작용성과 전통적 스토리텔링의 교육적 효과성이 결합된 디지털 스토리텔링이 탄생하였다. 디지털 스토리텔링은 기존의 스토리텔링을 뛰어넘어 움직이는 화면과 소리 등 멀티미디어적 요소를 함께 제공하기 때문에 학습자의 흥미를 쉽게 유발하며 초등학생의 다양한 지능을 자극하고 양방향적 상호작용을 가능하게 한다. 따라서 본 연구에서는 디지털 스토리텔링을 분석한 후 초등학교 현장에서 적용할 수 있는 학습요소의 추출하여 디지털 스토리텔링이 가능한 수업을 설계하여 제시하고자 한다.

• 한국소음진동공학회논문집
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• 제17권8호
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• pp.708-719
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• 2007

In case of indoor gymnastics training floor, in view of its characteristics, since it is simultaneously required the related smooth communication between the coach and the player, also the acoustic performance regarding to the clearness of music, besides the sport activity, the consideration about the acoustic character has entered the stage as an indispensable element. On such viewpoint, recently constructed dome-typed gymnastic training floor was optimized acoustic design with remodeling through acoustic simulation test. And acoustic satisfaction degree and reaction was attempted to investigate about the gymnastics training floor estimating value of human's psychological(sensual) degree using auralization that enables to experience the virtual sound field at the stage of design. As the result of investigation about the research on the space of object, it could be known that the valuation regarding to the acoustic performance of 'after-improvement' was distinctly more refined than that of 'before-improvement'. It is now considering that such result of the study can be utilized as the useful data which enables to improve the retrenchment effect of the construction cost as well as the acoustic capability, by means of the prediction control on the acoustic problem from the stage of design, for the occasion when the similar indoor sport gymnasium is planning to build for the near future.

• 디지털콘텐츠학회 논문지
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• 제19권9호
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• pp.1679-1688
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• 2018

디지털 기술의 발달은 단순히 표현 기술의 발달만이 아니라 제작의 과정, 표현 매체, 제작 형식 및 방법, 관객과의 커뮤니케이션에서도 변화를 가져왔다. 그 하나의 형태로 지면 포스터 대신 LCD 디스플레이를 이용한 모션포스터가 등장하게 되었다. 이것은 단순히 지면에서 사운드와 움직임이 가미된 포스터의 발생만이 아니라, LCD 디스플레이라고 하는 플랫폼이 가지고 있는 특징을 활용한 확장의 가능성을 제시해 주고 있다. 이 확장의 하나로 본 논문에서는 "인터랙션"이라는 요소에 주목, 인터랙티브 모션포스터를 새롭게 제안한다. 연구의 내용 및 방법으로 첫 번째, 본 논문의 대상이 되는 포스터의 개념 및 특징에 대하여 알아보며, 표현 테크놀로지의 발달에 따른 포스터의 변천과 우리나라 영화포스터의 발달에 대하여 고찰하고, 디지털시대 영화포스터의 형태로 모션포스터에 대하여 알아본다. 두 번째, 인터랙티브 모션포스터의 제안으로 영화 <서치>의 인터랙티브 모션포스터를 기획, 가능성을 확인한다. 더불어 포스터에 인터랙션이 채용되었을 때, 인터랙티브 모션포스터의 정의, 특징, 그리고 가능성 및 확장성에 대하여 제시하였다.

• 신재생에너지
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• 제8권2호
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• pp.44-51
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• 2012

The aim of this paper is to examine the hydraulically optimized camber of a blade. Prior studies have tried to determine the sound method of design on small-hydro turbines. These have appeared to realize a reasonably efficient small-hydro turbine. Nonetheless, specific and accurate design data have not as yet been established for the shape of the runner blade. Hence, this study examines the performance characteristic of an axial propeller turbine with 0~8% camber variations. The results of output power, efficiency, and pressure distribution of the turbine are graphically depicted. The definition of camber refers to the NACA airfoil. The commercial finite element analysis (FEA) packages, ANSYS, and CFX are used in this study. The results revealed the performance characteristics on small-hydro turbine and suggested a highly efficient section shape of the runner.

• 한국소음진동공학회논문집
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• 제12권1호
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• pp.42-47
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• 2002

Sirocco fans are widely used in HVAC and air conditioning systems, and the noise generated by these machines causes one of the most serious problems. In general, the sirocco fan noise is often dominated by tones at BPF(blade passage frequency) and broadband noise. However, only a few researches have been carried out on predicting the aeroacoustic noise because of the difficulty in obtaining detailed information about the flow field and casing effects on noise radiation. The objective of this study is to develop a prediction method for the unsteady flow field and the acoustic pressure field of a sirocco fan. We assume that the impeller rotates with a constant angular velocity and the flow field around the impeller is incompressible and inviscid. So, a discrete vortex method (DVM) is used to model the centrifugal fan and to calculate the flow field. The force of each element on the blade is calculated by the unsteady Bernoulli equation. Lowson\`s method is used to predict the acoustic source. Reasonable results are obtained not only fur the tonal noise but also far the amplitudes of the broadband noise. Acoustic pressure is proportional to (Ω)2.3, which is the similar value with the measured data.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2011년도 춘계학술대회 논문집
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• pp.588-593
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• 2011

The Main design parameters of ship HVAC systems are pressure drop and noise analysis of ducts. The Noise prediction for HVAC(Heating, Ventilating and Air Conditioning) systems are normally performed by empirical method suggested by NEBB(National Environmental Balancing Bureau, 1994), but NEBB's method is not suitable for the ship HVAC systems. In this paper, numerical analysis methods are used to develop a noise prediction method for the ship HVAC systems, especially for large ducts. To develop regression formula of attenuation of sound pressure level in large duct, Boundary Element Method(BEM) is used. Using dynamic loss coefficient which is suggested by ASHRAE fitting data base and numerical methods of HVAC noise analysis, integrated HVAC noise analysis of Program is developed. The developed program can present pressure drop and noise analysis of the ship HVAC systems. To verify the accuracy and convenience of the developed program, prediction of HVAC system for Semi-Submersible Drilling RIG is carried out and the results are compared with measurement of noise level during sea trial.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2013년도 춘계학술대회 논문집
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• pp.796-802
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• 2013

In this study, we investigates active control technology to reduce the noise transmitted to the outside through the opening of enclosures. A numerical model based on acoustic boundary element method is first established. Using the numerical model, the acoustic transfer functions of the field points over the opening to the primary source at arbitrary locations are estimated. The feedforward control to minimize the acoustic power through the opening is then numerically implemented. The controller generates the secondary source to destructively interfere the noise transmission through the opening. Finally, a parametric study is conducted to evaluate the effects of the location and the number of the microphones on the control performance. Furthermore, the effects of the location of the secondary source on the performance of active noise control are investigated. It is followed that the control system implemented in this study leads to a significant reduction of about 35dB in sound power through the open using only on secondary source located at the optimized position.

• 대한기계학회논문집B
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• 제25권12호
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• pp.1905-1910
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• 2001

Pressure resonance frequency that is caused in the combustion chamber can be interpreted by acoustic analysis. Until now the pressure resonance has been assumed and calculated to a disc type combustion chamber that neglected the combustion chamber height because the knock occurs near the TDC(top dead center). In this research FEM(finite element method) has been used to calculate the pressure resonance frequency inside the experimental engine combustion. The error of the resonance frequency obtained by FEM has decreased about 50% compared to the calculation of Draper's equation. Due to the asymmetry in the shape of the combustion chamber that was neglected in Draper's equation we could find out that a new resonance frequency could be generated. To match the experimental results, the speed of sound that satisfies Draper's equation is selected 13% higher than the value for pent-roof type combustion chamber.

• 한국산학기술학회논문지
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• 제15권8호
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• pp.4796-4801
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• 2014

관절형 고속철도차량의 승차감 향상 및 주행안전을 위해서는 객차 갱웨이 통로연결막에 대한 화재안전성, 방음기능과 함께 3축 회전각변위(롤링/요잉/피칭) 모드하의 내구성을 만족하는 것이 중요하다. 그러나 국내의 경우 본 통로연결막에 대한 내구성 시험 및 규격은 아직 표준화되지 않고 있다. 본 연구에서는 비선형 구조해석 결과와 고무피로특성으로부터 피로 수명을 예측하였다. 또한, 리그 피로시험을 구축하여 본 부품의 내구성을 검토하였다.

• KIEAE Journal
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• 제8권1호
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• pp.11-18
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• 2008

The purpose of this study is to analyze application methods and structural characteristics of each element of environment-friendly European housing through classification of skin types. The results of the study are following. 1) The skins are classified by three types; single skin with multi layers, double skin with single layer and double skin with multi layers. 2) Most single skins with multi-layer are composed with wooden louvers, sun blinds and insulating windows. There are introduction of atrium and balcony, and variation sectional space composition according to cases. 3) There are two types of double skins; to put cavity between inner skin and outer skin and more extensional spaces such as balconies, corridors and stair halls. Solar walls and mechanical ventilators are often introduced to double skins with multi-layer. 4) The functions of the latest environment-friendly skins are vary from controllers and buffers of indoor environmental elements such as temperature, light, air and sound to equipments to perform essential functions to efficiently operate HVAC systems.