• 한국전산유체공학회:학술대회논문집
• /
• 2004.10a
• /
• pp.53-59
• /
• 2004

A general purpose program NUFLEX for the analysis of 3-D heat/fluid flow in complex geometry with pre/post processor have been developed, which consists of a flow solver based on FVM and a dedicated pre/post processor. The program employs a general non-orthogonal grid system and solve laminar and turbulent (lows with standard and RNG $\kappa-\epsilon$ turbulence models. NUFLEX is capable of analysing two-phase flow with topologically complex interface, turbulent diffusion combustion, solidification problems and magnetic flow. For the purpose of verification of the program and testing the applicability, several practical problems are solved and compared with the available data. Comparison of the NUFLEX results with that by the STAR-CD program has been also made for the same flow configuration and grid structure.

• MALSORI
• /
• no.53
• /
• pp.119-127
• /
• 2005

Speech recognition is one of the user interface technologies in commanding and controlling any terminal such as a TV, PC, cellular phone etc. in a ubiquitous environment. In controlling a terminal, the mismatch between training and testing causes rapid performance degradation. That is, the mismatch decreases not only the performance of the recognition system but also the reliability of that. Therefore, the performance degradation due to the mismatch caused by the change of the environment should be necessarily compensated. Whenever the environment changes, environment adaptation is performed using the user's speech and the background noise of the changed environment and the performance is increased by employing the models appropriately transformed to the changed environment. So far, the research on the environment compensation has been done actively. However, the compensation method for the effect of distant-talking speech has not been developed yet. Thus, in this paper we apply MLLR-based environment adaptation to compensate for the effect of distant-talking speech and the performance is improved.

• KSCI Review
• /
• v.2 no.2
• /
• pp.7-18
• /
• 1996

In this paper library is proposed to store and retrieve the software components, in addition to that designed and implemented the user interface for management and control of this library. Applying components to this library for version control, component's quantitative testing are processed. In the case of user selection of component's a high quantative rate components can be selected.

• Journal of the Korean Society for Railway
• /
• v.9 no.6 s.37
• /
• pp.671-676
• /
• 2006

A measurement system was developed in this study. It conducts on-line testing and evaluation of tilting train express(TTX). The measurement system is installed in each train for the performance measurement during the test run. It is composed of software part, hardware part and can measure various signals such as vehicle velocity, catenary voltage, motor temperature. The software controls the hardware of the measurement system, performs the analysis and calculation of measurement data and acts as interface between users and the system hardware. The hardware is consisted of 7 DAMs(Data Acquisition Modules) and 6 monitoring modules.

• Journal of the Korean Institute of Telematics and Electronics A
• /
• v.32A no.3
• /
• pp.134-142
• /
• 1995

We discovered that each distinct shape of the roof-shaped peaks of (111) facets, which are generated on (110) cross-section of the directly bonded (100) silicon wafer pairs after KOH etching, can be mapped to one of three conditions of the interfacial oxide existing at the bonding interface as follows. That is, thick solid line can be mapped to stabilization, thin solid line to disintegration, and thin broken line to spheroidization. also we confirmed that most of the interfacial oxides of a well-aligned wafer pairs were disintegrated and spheroidized through high-temperature annealing process above 900$^{\circ}$C while the oxide was stabilized persistently when two wafers are bonded rotationally around their common axis perpendicular to the wafer planes.

• Proceedings of the Korean Society of Broadcast Engineers Conference
• /
• 1997.06a
• /
• pp.67-70
• /
• 1997

This Paper describes the system configuration and implementation method of an IMPRES (Interactive Multimedia exPRESS) terminal. The terminal is developed in the form of a PC add-on board that is called MINIBA (Media and Network Interface Board Assembly). IMPRESS is a communication service platform that support various interactive multimedia services. The main objectives of developing IMPRESS are to implement DAVIC compliant services platform to verify DAVIC specification and to support testing environment. Currently IMPRESS terminal provides MPEG-2 quality movies on demand, switched video broadcasting, and home-shopping service to the service user, based on the ATM network.

• Proceedings of the Korean Society for Emotion and Sensibility Conference
• /
• 2002.11a
• /
• pp.215-218
• /
• 2002

감성정보를 디자인 활동에 필요한 정보로 활용하기 위해서는 전체 디자인 프로세스에서 사용자를 최초 컨셉 단계에서부터 참여시켜 관찰 및 평가에 적극 동참케 하는 사용자 참여 디자인이 매우 효과적이다. 이러한 감성 정보 수집 및 평가를 통한 상용자 인터페이스 디자인 개발 프로세스를 MP3 CDP를 대상으로 적용하여 연구를 진행하였다. 최근의 MP3CD Player들은 일반 음악 CD들이 10여곡에서 많게는 20여곡 정도의 분량을 가지고 있는 것에 비해 그 분량이 최고 100여곡 이상에 이르고 있다. 그럼에도 불구하고 MP3CD Player들은 기존의 일반 음악 CD Player의 UI를 소극적으로 수정, 변경하여 사용하고 있는 상황이다. 본 연구는 자체적인 곡 분류방법을 제시하고 있는 ‘H’사의 MP3CD Player를 선정하고 이를 기준으로 초기 디자인에 사용자를 참여시켜 사용자 감성 정보 및 요소들을 효과적으로 평가하여 사용자 중심 디자인을 극대화 시키는 방법을 모색하였다. 제품의 최초 기능 분석시에는 카드인덱스(Card Index)방식을 이용하여 기능을 그룹핑하고 인터페이스를 개선하였으며 이를 토대로 프로토타입을 완성하였다. 이를 사용자가 직접 조작하는 방식을 관찰 분석하여 평가 결과를 토대로 UI 디자인가이드라인을 제시하였다.

• Structural Engineering and Mechanics
• /
• v.15 no.4
• /
• pp.477-493
• /
• 2003

Masonry is not a simple material, the influence of mortar joints as a plane of weakness is a significant feature and this makes the numerical modelling of masonry very difficult especially when dynamic (seismic) analysis is involved. In order to develop a simple numerical model for masonry under earthquake load, an analytical model based on Distinct Element Method (DEM) is being developed. At the first stage, the model is applied to simulate the in-plane shear behaviour of an unreinforced masonry wall with and without opening where the testing results are available for comparison. In DEM, a solid is represented as an assembly of discrete blocks. Joints are modelled as interface between distinct bodies. It is a dynamic process and specially designed to model the behaviour of discontinuities. The numerical solutions obtained from the distinct element analysis are validated by comparing the results with those obtained from existing experiments and finite element modelling.

• Steel and Composite Structures
• /
• v.20 no.1
• /
• pp.185-203
• /
• 2016

Shear connectors are key components to ensure the efficient composite action and satisfactory transfer of shear forces at the steel-concrete interface in composite beams. Under hazardous circumstances, such as fire in a building, the performance of a composite beam significantly relies on the performance of shear connectors. Studies on the behavior of shear connectors subjected to elevated temperatures performed in the last decade are reviewed in this paper. The experimental testing of push-out specimens, the design approaches provided by researchers and different codes, the major failure modes, and the finite element modeling of shear connectors are highlighted. The critical research review showed that the strength of a shear connector decreases proportionally with the increase in temperature. Compared with the volume of work published on shear connectors at ambient temperatures, a few studies on the behavior of shear connectors under fire have been conducted. Several areas where additional research is needed are also identified in this paper.

• Proceedings of the Korean Society of Machine Tool Engineers Conference
• /
• 2005.05a
• /
• pp.234-238
• /
• 2005

One approach to testing the suitability of a adhesive joint for a particular application is to build and test to destruction of a representative sample of the joint. The nondestructive test will not measure strength directly but will measure a parameter which can be correlated to the strength. It is therefore, essential that a suitable nondestructive test is chosen and its results are correctly interpreted. In this paper, typical ultrasonic signal analysis in adhesive joints are evaluated together with interface stress from the result of finite element analysis.