• 한국콘크리트학회:학술대회논문집
• /
• 한국콘크리트학회 2006년도 추계 학술발표회 논문집
• /
• pp.261-264
• /
• 2006

Deformability of RC members in shear after flexural yielding is limited and controlled by governing failure modes and material strength. Shear strength of members in D-regions has been explained by a direct load path (direct strut or arch action) and indirect load path (fan action or truss action). Indirect load path including truss action and fan action rely on bond along tension ties. Generally, superposition of two actions results in total shear strength when shear failure modes control. The ultimate deformation depends on controlling failure modes and thereby, their force transfer patterns. Proposed models are capable of explaining of limited deformability of RC members in D-regions.

• 한국정보통신학회논문지
• /
• 제24권11호
• /
• pp.1550-1553
• /
• 2020

In this paper, we maximize the lifetime of a multi-hop path through a cooperative wireless energy sharing scheme between constituent nodes in a wireless multi-hop communication. Considering a bidirectional multi-hop communication environment, we present an optimization problem to maximize path lifetime by adjusting the amount of energy each node needs to share with its neighboring nodes. On the basis of solidarity property, i.e., the lifetime of the multi-hop path is maximized when the lifetimes of all nodes are the same, we convert the considered optimization problem into a linear programming problem and solve it easily. Simulation result shows that the proposed two-way wireless energy sharing method maximizes the path lifetime of multi-hop communications and approximately doubles the path lifetime compared with the one-way energy sharing method.

• 소음진동
• /
• 제8권6호
• /
• pp.1158-1165
• /
• 1998

실내 저주파 소음은 도로가진, 차량 현가 또는 엔진 마운트와 같은 차량 샤시 부품의 진동인 구조 진동에 기인한다. 실내 저주파 소음을 줄이려는 노력의 일환으로 소음 원의 위치 및 소음 전달경로를 추적하는 기술인 TPA (Transfer Path Analysis) 를 소개하였다. 본 연구에서는 TPA 기술을 이론적으로 고찰해보고 이를 실제로 적용하여, 도로가진에 의해 앞 좌석에서의 실내 소음에 기여도가 가장 큰 샤시 부품을 찾는 Case Study를 소개하였다. TPA를 적용하기 위한 데이터를 얻기 위해. 도로가진에서 소음으로 연결되는 계측과 실차 운행 상태의 진동 데이터 계측을 실시하였다. 또한 아스팔트 도로에서 시속 30 km/h로 달리면서 관능 평가와 진동 소음 계측 평가 모두를 실시하여 문제가 되는 저주파 실내 소음을 확인하였다. 시험 분석 결과 Trailing Arm을 통해 전달되는 소음이 앞 좌석 저주파 실내 소음에 대한 기여도가 가장 크게 나타났다.

• 정보처리학회논문지A
• /
• 제14A권2호
• /
• pp.85-90
• /
• 2007

본 논문은 애니메이터로 하여금 표정공간으로부터 임의의 표정상태 수 개를 선택하도록 하면, 최적의 표정전이경로를 자동적으로 설정하도록 해줌으로써, 얼굴 표정 애니메이션을 실시간적으로 생성하거나 표정 제어가 가능하도록 하기 위한 기법을 기술한다. 표정공간은 약 2500개의 얼굴 표정상태 간의 거리를 구하고, 다차원 스케일링 기법을 사용하여 2차원 평면에 분포시킴으로서 형성된다. 표정공간에서 최적의 표정전이경로를 설정하기 위해서는 임의의 얼굴 표정상태를 기준으로 사분면처럼 4개의 영역으로 나눈다. 그리고 각 영역별로 최단거리에 존재하는 열굴 표정상태를 결정하고, 그 중에서 가장 가까운 얼굴 표정상태를 선택하여 전이시키고, 전이가 끊어진 얼굴 표정상태에서는 두 번째, 세 번째 혹은 네 번째로 가까운 얼굴 표정상태를 선택하여 순서대로 전이시킴으로써 완전한 표정전이경로가 결정된다. 그리고 애니메이터가 표정공간에서 대표적인 수 개의 표정상태만을 선택해주면 시스템은 자동적으로 최적의 표정전이경로를 설정하여 준다. 본 논문은 애니메이터들로 하여금 본 시스템을 사용하여 얼굴 애니메이션을 생성하거나 표정 제어를 수행하도록 하였으며, 그 결과를 평가한다.

• Journal of Information Technology Applications and Management
• /
• 제15권3호
• /
• pp.43-59
• /
• 2008

This paper studies small and medium sized financial agency's management states that take advantage of the Korea Federation of Saving Bank's data. It also presents the management state and the decision-making model that monitors progressive insolvency by standardizing transfer path between relevant groups. With this in mind, we extracted explanatory variables for predictions of insolvency by using existing studies of document related insolvency. First of all, we designed a state model based on demarcated groups to take advantage of the self organizing map that groups in line with a neural network. Secondly, we developed a transition model by standardizing the transfer path between individual banks in a state model. Finally, we presented a decision-making model that integrated the state model and the transition model. This paper will provide groundwork for methods of insolvency prevention to businesses in order for them to have a smooth management system in the financial agencies.

• 대한기계학회논문집A
• /
• 제25권9호
• /
• pp.1410-1415
• /
• 2001

Active control of sound radiation from a vibrating rectangular plate by a steady-state harmonic point force disturbance is experimentally studied. Structural excitation is achieved by two piezoceramic actuators mounted on the panel. Two accelerometers are implemented as error sensors. Estimated radiated sound signals using vibro-acoustic path transfer function are used as error signals. The vibro-acoustic path transfer function represents system between accelerometers and microphones. The approach is based on a multi-channel filtered-x LMS algorithm. The results shows that attenuation of sound levels of 11dB, 10dB is achieved.

• 한국정밀공학회지
• /
• 제25권12호
• /
• pp.107-116
• /
• 2008

The excitation force of a powertrain is one of major sources for the interior noise of a vehicle. This paper presents a novel approach to predict the interior noise caused by the vibration of the power rain by using the hybrid TPA (transfer path analysis) method. Although the traditional transfer path analysis (TPA) is useful for the identification of powertrain noise sources, it is difficult to modify the structure of a powertrain by using the experimental method for the reduction of vibration and noise. In order to solve this problem, the vibration of the power rain in a vehicle is numerically analyzed by using the finite element method (FEM). The vibration of the other parts in a vehicle is investigated by using the experimental method based on vibrato-acoustic transfer function (VATF) analysis. These two methods are combined for the prediction of interior noise caused by a power rain. Throughout this research, two papers are presented. This paper presents a simulation of the excitation force of the power rain exciting the vehicle body based on numerical simulation. The other paper presents a prediction of interior noise based on the hybrid TPA, which uses the VATF of the car body and the excitation force predicted in this paper.

• 한국소음진동공학회논문집
• /
• 제24권6호
• /
• pp.444-451
• /
• 2014

The signal patterns of slosh noise produced by the fuel tank of a passenger vehicle are characterized by analyzing vehicle interior noise, fuel tank vibration, and near-field noise radiated from the fuel tank. This paper also shows the noise transfer path analysis results performed from the fuel tank to the vehicle inside. On top of them, physical index is described, demonstrating a good correlation with subjective feeling of slosh noise. It is essential to identify the main noise transfer paths for redesigning of the fuel tank system aiming at reducing slosh noise and also helpful to apply physical index in evaluating and reducing this noise. It is found that structure-borne path is the main root of slosh noise and a value reveals a good correlation with subjective feeling.

• Bulletin of the Korean Chemical Society
• /
• 제28권12호
• /
• pp.2343-2353
• /
• 2007

We report the application of time-dependent density functional theory (TDDFT) to the calculation of potential energy profile relevant to the excited state intramolecular proton transfer (ESIPT) processes in title molecules. The TDDFT single point energy calculations along the reaction path have been performed using the CIS optimized structure in the excited state. In addition to the Stokes shifts, the transition energies including absorption, fluorescence, and 0-0 transition are estimated from the TDDFT potential energy profiles along the proton transfer coordinate. The excited state TDDFT potential energy profile of SA and 3ASA resulted in very flat function of the OH distance in the range ROH = 1.0-1.6 A, in contrast to the relatively deep single minimum function in the ground state. Furthermore, we obtained very shallow double minima in the excited state potential energy profile of SA and 3ASA in contrast to the single minimum observed in the previous work. The change of potential energy profile along the reaction path induced by the substitution of electron donating groups (-NH2 and -OCH3) at different sites has been investigated. Substitution at para position with respect to the phenolic OH group showed strong suppression of excited state proton dislocation compared with unsubstitued SA, while substitution at ortho position hardly affected the shape of the ESIPT curve. The TDDFT results are discussed in comparison with those of CASPT2 method.

• International Journal of Automotive Technology
• /
• 제4권1호
• /
• pp.21-30
• /
• 2003

In this paper a systematic test procedure for evaluation of road-induced noise of a vehicle and guidelines for each test are presented. Also, a practical application of the test procedure to a small SUV is presented. According to the test procedure, all the tests were performed to evaluate road-induced booming noise that is in low frequency range. First of all the information on characteristics of road-induced noise was obtained through baseline test. Coupling effects between body structure and acoustic cavity of a compartment were obtained by means of modal tests for a structure and an acoustic cavity. Local stiffness of joint areas between chassis system and car-body was determined by test for measurement of input point inertance. Noise sensitivities of body joints to operational forces were obtained through test for measurement of noise transfer functions. Operational deflection shapes made us analyze behaviors of chassis system under running condition and then find sources of noise due to resonance of the chassis system. Finally, Principal Component Analysis and Transfer Path Analysis were utilized to investigate main paths of road-induced noise. In order to evaluate road-induced booming noise exactly, all of tests mentioned above should be performed systematically.