• Journal of Korea Soil Environment Society
• /
• v.3 no.3
• /
• pp.55-62
• /
• 1998

Soils contaminated with hydrocarbons and residual metals can be effectively treated by soil washing. In developing the soil washing process several major effects for separating contaminants from coarse soils progressively improved upon combinations of mining and chemical processing approaches. The pilot-scale soils washing process consists of the four major parts : 1) abrasive scouring, 2) scrubbing action using a washwater that is sometimes augmented by surfactants or other agents, 3) rinsing, and 4) regenerating the contaminated washwater. The plant was designed based upon the treatment capacity > 5 ton/hr on site. The lumpy contaminated soil fractions first experience deagglomeration and desliming passing through a rolling mill pipe. In the second unit the attrition scrubbing module equipped with paddles uses high-energy to remove contaminants from the soils. And a final rinsing system is assembled to separate the washwater containing the contaminants and very fine soils from the washed coarse soils. For recycling the contaminated washwater passes through a washwater clarifier specifically designed for flocculation, sedimentation and gravity separation of fine as well as flotation and separation of oils from the washwater. In order to more rapidly assess the applicability of soil washing at a potential site while minimizing the expense of mobilization and operation, a mobile-type soil washing process which is self-contained upon a trailer will be further developed.

• Journal of the Institute of Electronics Engineers of Korea SD
• /
• v.40 no.10
• /
• pp.9-16
• /
• 2003

In this paper, we propose an ATM processor suitable for VoDSL subscriber's equipments. The processor is composed of ATM block, AAL protocol block and ATS scheduler, and provides up to 4 VCC which service data and voice traffics on the ATM network. The proposed ATS scheduler can guarantee QoS of the voice traffic and supports multiple AAL2 packet. The ATM processor is manufactured on the 0.35 micron fabrication line of HYNIX semiconductor and provides the maximum data transfer rate of up to 52 Mbps. We implement the LAD, which is the VoDSL subscriber's equipment. The experimental results on the test bed network shows that the proposed hardware scheme successfully services most of the applications of the VoDSL services.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.13 no.3
• /
• pp.1014-1020
• /
• 2012

This paper focuses on the development of a supporting S/W tool that can minimize designer's manual operations and errors in metal mold design based on a 3D solid model. The scope in this work includes the offset surface modeling, the computation of the padding force, the generation of material table, the decision of hole position, the estimation of the size of raw material, which are the essential parts of press die and mold design in automotive industry. The proposed system has been developed as a plug-in type using Pro/E API and Visual C++ in order to put the system into the menu functions of Pro/E which is one major 3D CAD systems in the manufacturing industry.

• Journal of Korea Multimedia Society
• /
• v.11 no.11
• /
• pp.1536-1546
• /
• 2008

RSVP-capable router supporting guaranteed services on the internet generally uses a packet scheduler based on the Weighted Fair Queuing (WFQ) algorithm to secure required qualities of traffic flows. A RSVP-capable router based on the LOFQ (Latency optimized fair queuing) algorithm had been proposed to improve the performance of the WFQ-based RSVP-router, but it required not only the RESV message to be expanded but also its performance could be evaluated only through simulation. This paper proposed a LOFQ based RSVP-capable router using the conventional RESV message and developed an algorithm to analyze the performance of the LOFQ based RSVP-capable routers. The performance evaluation using the developed algorithm showed that in terms of performance improvement the proposed router is inferior to the one using the expanded RESV message under a small packet size, but on the range of a large packet size both routers provide the same improvement.

• Proceedings of the Korean Society of Marine Engineers Conference
• /
• 2011.06a
• /
• pp.312-312
• /
• 2011

All ship's ballast water should be inspected by administration after enter into force IMO BWM Convention. The purpose of the sampling device is to concentrate large amount of samples and to improve return rate of samples. It is composed of Concentration and Rinsing Part and optimized by the variety of tests. it is fully automated and therefore efficiently operated in ships.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2016.10a
• /
• pp.412-415
• /
• 2016

본 연구에서는 학술정보의 효율적 관리 및 서비스 체제를 수립하고 활용성을 강화하기 위해 논문 자동 수집 및 구축, 논문 투고 및 심사, 전자출판, XML 자동 구축에 이르기까지 전주기 기능 구현에 방안을 제시하고 이를 구현한 사례를 소개하고자 한다. 기존 Peer-Review 시스템은 데이터 수집 및 변환파트와 투고 및 심사, 전자출판 파트, XML 구축 파트 등으로 분리되거나 별도로 운영되어 왔다. 본 연구에서는 이러한 기능을 통합적으로 구현하기 위해 KISTI의 Peer-Review 시스템인 ACOMS와 XML 기반 학술정보서비스 시스템(KpubS) 기능 및 프로세스를 통합한 구현 방안을 제시하고 이를 시스템으로 구현하였다. 그러나 아직까지 원문 PDF를 XML로 완전 자동 변환할 수 있는 기술은 없는 상태로써 반자동 변환 기능을 탑재하였다. 본 연구 내용은 다양한 수집 채널을 통해 입수된 학술정보 및 XML 자료에 대한 입력체계를 제공하고, XML 본문으로부터 메타데이터를 자동 식별 및 추출하여 학술정보 DB를 구축 저장하며, 구축된 DB 및 XML 기반의 전자출판 기능 제공과 함께 웹서비스 단계까지의 전주기 공정에 대한 프로세스 모델 및 시스템에 관한 것이다. 이에 데이터베이스 구축을 위한 시간 및 비용을 절감할 수 있을뿐만 아니라, 시맨틱 태깅 및 수식, 표, 그림 정보 제공 등 이용자에게 다양한 형태의 서비스를 제공할 수 있게 되었다.

• Journal of IKEEE
• /
• v.20 no.1
• /
• pp.107-110
• /
• 2016

In this paper, an IEEE 802.15.4 LR-WPAN 868/915 MHz ZigBee transceiver for IoT systems was designed and implemented. Non-coherent demodulation was exploited to satisfy ${\pm}80ppm$ frequency offset recommended in IEEE 802.15.4 LR-WPAN. Variable bitrate was supported according to operation modes. SPI module was embedded to connect various MCUs. The designed Zigbee transceiver was described in Verilog HDL and it was synthesized and verified in $0.18{\mu}m$ process. Its gate count was about 32,000 gates.

• Information and Communications Magazine
• /
• v.29 no.11
• /
• pp.81-93
• /
• 2012

60GHz 주파수는 최대 9GHz 까지 엄청난 대역폭을 활용하여 Gbps급의 무선전송이 가능한 대역으로서, 최근 이 대역을 댁내 무선전송장치 및 초고속 무선랜에 활용하기 위한 연구가 활발히 진행되고 있다. 이와 같이 60GHz에 대한 관심도가 높아진 이유는, 밀리미터파 통신이 기존에는 무선 백홀용으로 주로 사용되었던것에 비해 지금은 가정 및 사무실내에서의 초고속 네트워크 또는 영상가전에서의 무선 전송장치 등 응용분야의 다변화가 예상됨에 따라, ISM 대역이면서 광대역을 활용할 수 있는 60GHz가 급부상하게 된 것으로 본다. 이와 함께 CMOS 칩기술의 꾸준한 발전으로 현재는 수 십 나노공정을 이용하여 테라헤르쯔 대역에서도 동작하는 칩이 발표되고 있는 바 그동안 60GHz 시장 확산의 가장 큰 걸림돌이 었던 무선 전송장치의 높은 가격, 사이즈, 소모전력의 문제를 한꺼번에 해결할 수 있게 된 점도 이유중 하나이다. 따라서 이와 관련하여 본고에서는 ETRI와 KETI를 중심으로 진행되어 온 "60GHz 무선 전송장치에 탑재 가능한 범용 CMOS 송수신 칩 및 이를 활용한 빔포밍 트랜시버 기술에 관한 연구"를 소개하고자 한다.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.26 no.11B
• /
• pp.1595-1599
• /
• 2001

In this paper, we have desired and implemented of ASK modulator MMIC operating at 5.8 GHz for OBE used in AGPS(Automatic Gate Passing System). The proposed ASK modulator MMIC was implemented to apply a single supply voltage of 3 V to the drain in order to decrease ACP(Adjacent Channel Power). As a result, it is exhibits a broad linear modulation range from 0.7 V to 3 V and an On/off characteristic over 40 dB. The layouts of ASK modulator MMICs was designed and fabricated by using ETRI 0.57m MESFET library The chip size was 1.0mm $\times$x1.0mm.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.19 no.11
• /
• pp.2677-2682
• /
• 2015

Smart factory has the function of integrated management of production process management, logistics management as a intelligent factory, it is also emerging as the core of new industry which converges ICT and manufacturing business. We suggested Smart factory logistics management system which embedded position tracking technology and the system converges ICT and IoT. This suggested system can manage all the processes from production to release by tracking route and position based on signal strength of bluetooth 4.0 beacon tag. For the more, we will expect to apply to the various type of factory environments like detachable installation, optimized management using sensor.