• Proceedings of the KIEE Conference
• /
• 1985.07a
• /
• pp.144-147
• /
• 1985

In electricity industry, the improvement of load factor by flattening of load has been considered to be more important than any other tasks and has received wide concern and interest. Especially while annual peak load had occured early evening in winter during past decades, but we found the trend has changed so that annual peak load occured during the daytime in summer since1981 The useful practicing methods of this load management ale as follows; 1. Inducing of midnight load by thermal storage water heating 2. Seasonal differential rates. 3. Revising the peak load priceing (Time-of -use) It seems hard to expect that load research can be carried out in a short time, and we all have to exert outselves continuously to provide efficient load management method without wasting resources.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
• /
• 2000.07a
• /
• pp.440-443
• /
• 2000

The (Sr$_{1-x}$ Ca$_{x}$) thin films ale deposited OR Pt-Coated electrode(Pt/TiN/SiO$_2$/Si) using RF sputtering method with substitutional contents of Ca. The maximum grain of thin films is obtained at SCT15 thin film. The dielectric constant was increased with increasing the substitutional contents of Ca, while it was decreased if the substitutional contents of Ca exceeded over 15[mol%]. The temperature properties of the dielectric loss have a stable value within 2% independent of the substitutional contents of Ca.Ca.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
• /
• 2005.11a
• /
• pp.184-187
• /
• 2005

The blade is an important part of rotating turbomachinery. The blade dynamic strength is of considerable importance as far as the reliability of operation and the life of the engine ate concerned. In this paper, blades are attached to a disk and coupled by means of damping wire. We assumes that the interfaces between the blade and disk dovetails are joined together, which means surface-to-surface contacts without friction. The damping wire is implemented using a beam element and temperature effect in the blade is neglected. Centrifugal forces ale applied by using an angular velocity to all elements in the system. The FEM results showed vibration characteristics in the blade disk system for the cases of a free-standing blade and blades with damping wire, respectively.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
• /
• 2004.11a
• /
• pp.1097-1100
• /
• 2004

In this study the fluid-solid coupling(sloshing) behavior of the tanker-lorry during turning are investigated numerically. The ALE numerical method is used as sloshing analysis algorithm and numerical simulation is conducted for the various fluid filling height 25%, 50% and 75%. The forces for radial and vertical direction are calculated and compared for various fluid-filling heights. From the analysis results, in case of 25% filling, the sloshing effect is the most highest.

• Journal of Aerospace System Engineering
• /
• v.15 no.6
• /
• pp.10-18
• /
• 2021

A flame deflector prevents a launch system from thermal damage by deflecting the exhaust flame of the launch vehicle. During the deflection of the flame, the flame deflector is subjected to a high-temperature and high-pressure flow, which results in thermal ablation damage at the surface. Predicting this ablation damage is an essential requirement to ensure a reliable design. This paper introduces a numerical method for predicting the ablation damage phenomena based on a one-way fluid-structure interaction (FSI) analysis. In the proposed procedure, the temperature and convective heat transfer coefficient of the exhaust flame are calculated using a fluid dynamics analysis, and then the ablation is calculated using a finite element analysis (FEA) based on the user-subroutine UMESHMOTION and Arbitrary Lagrangian-Eulerian (ALE) adaptive mesh technique in ABAQUS. The result of such an analysis was verified by comparison to the ablation test result for a flame deflector.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2009.11a
• /
• pp.435-436
• /
• 2009

RFID 시스템의 미들웨어는 태그에서 생성된 방대한 양의 데이터를 리더를 통해 전달받는다. RFID 미들웨어는 이러한 데이터를 정제하여 응용 애플리케이션에 전달하는 기능을 담당한다. 하지만 태그 데이터 정제 과정에서 발생되는 지연 시간은 RFID 미들웨의 응답성을 저하시킨다. 본 논문은 EPCglobal 의 RFID 미들웨어 표준인 ALE 에 의거하여 태그 데이터에 대한 다수의 필터링 조건들이 주어진 RFID 미들웨어 환경에서 실시간으로 수집되는 대용량의 태그에 대한 고속 필터링 엔진을 설계한다. 이를 위하여 Intermediate node 들이 key 값을 저장하는 Binary Search Tree 형태를 구성하여 태그를 필터링하는 방법을 제안한다. 결과로써 기존의 순차적인 RFID 데이터 필터링에 비해 고속의 필터링 성능을 보이며 특히 필터의 수가 증가할수록 필터링의 효율이 높아짐을 보인다.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
• /
• v.19 no.3
• /
• pp.245-251
• /
• 2001

Nowadays, the first design elements of horizontal alignment are very important things to extension or improvement of highway. When the design elements ale lost or damaged, it is necessary to recalculation. In this paper, an investigation is made on the method of representation of horizontal alignment as a result of design element using generalization method. The results show that northing calculated about 0.2∼5 meters and easting calculated about 1∼40 meters between calculated and design data. Because the maximum value is a very small compared to total horizontal alignment length. calculated data have been fined to presentation of observed highway.

• Korean Journal of Cognitive Science
• /
• v.12 no.3
• /
• pp.19-28
• /
• 2001

In this paper, we describe an algorithm for transliterated foreign word extraction in Korean language. In the proposed method we reformulate the transliterated foreign word extraction problem as a syllable-tagging problem such that each syllable is tagged with a transliterated foreign syllable tag or a pure Korean syllable tag. Syllable sequences of Korean strings ale modeled by Hidden Markov Model whose state represents a character with binary marking to indicate whether the character forms a Korean word or not. The proposed method extracts a transliterated foreign word with high recall rate and precision rate. Moreover, our method shows good performance even with small-sized training corpora.

• Journal of the Korean Society of Manufacturing Process Engineers
• /
• v.3 no.1
• /
• pp.72-78
• /
• 2004

In this paper, mechanical behaviors of developed pedicle screw system, made of bio-mechanical materials(Ti-6Al-4V, Grade 5), ale predicted using FEM analysis. As a first step, morphologic construction of normal Korean spines and surgical operation convenience are considered to design optimum pedicle screw system. In this step, various design variables are considered as design parameters to develop optimized models. As a next step, tension and bending tests are performed to improve the structural performance of the developed system using finite element method. In this step, required Static compression and bending test specifications by ASTM F-04 25 04 01 are applied to understand the bio-mechanical behaviors of the designed spinal implant system under various load types. As the results of this research, it is possible to develop efficient pedicle screw system, having enough rigidity and fixation to stand any spinal damage under allowable stress conditions.

• 제어로봇시스템학회:학술대회논문집
• /
• 1999.10a
• /
• pp.177-180
• /
• 1999

Nowadays, one of the major technical issues in manufacturing is to create an environment to promote collaboration among diverse engineering activities. Collaborative engineering is an innovative approach integrating widely distributed engineering activities through promoting information sharing and actual collaboration. It requires close interactions among developers, suppliers and customers, and consideration of entire product life cycle from concept to disposal. A carefully-designed operating system is crucial for successful collaboration of many different activities in a Networked Virtual Manufacturing System(NVMS). High extensibility, flexibility and efficiency ale the key characteristics requested of an operating system to handle the complexity of the NVMSs. In this paper, we propose a model of the operating system for collaborative engineering using concurrent quasi-procedural method(QPM). QPM is a goal-driven data management technique for distributed and parallel computing environments. It is to be applied to the evaluation of activities to be executed, validities of input data, execution path of activities for a needed output, and expected to greatly improve the productivity of operations by preventing redundant evaluations. Collaboration among many different engineering activities in NVMSs is to be performed by the network of agents that encapsulate the capabilities of both users and their tools.