• The Journal of Korean Institute of Electromagnetic Engineering and Science
• /
• v.10 no.2
• /
• pp.267-276
• /
• 1999

A 2 stage 6-pole bandpass filter (BPF) is designed and implemented by using K-band triple-mode cavity. The BPF has an 100MHz bandwidth at the center frequency of 18.5GHz and the response of the filter is Chebyshev function. The cavity filter uses two orthogonal $TE_{113}$ modes and one $TM_{012}$ mode. To obtain a Chebyshev response, the intercavity coupling between the adjacent cavities is accomplished by H-field component of TE modes parallel to slot plate. In this paper, the size and location of intercavity slot are determined by the detailed coupling equation from H-field of TE resonant modes in circular cavity. The measured results agree well with the theoretical one.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
• /
• 2006.05a
• /
• pp.54-58
• /
• 2006

This paper deals with primary consideration in down-conductor system and earth-termination system design of apartments. For down-conductor system, steelworks within reinforced concrete apartment structures have the electrical continuity, however, lashing is not suitable for lightning-current-carrying connections. So this paper suggest that the additional dedicated conductors should be installed and they are should be lashed to the reinforcement steel. Also this paper suggested the foundation earth electrode and global earth system as the earth-termination system of the apartments. But perfect bonding system is essential in lightning protection system to avoid life hazard and to protect electronic equipments.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2023.05a
• /
• pp.239-241
• /
• 2023

본 논문은 통신 시스템에 주로 사용되는 디지털 전자 서명 알고리즘 중 양자 내성 암호인 SPHINCS+ 알고리즘에 대한 효과적인 하드웨어 설계 방안에 대한 연구이다. SPHINCS+ 알고리즘은 해시 함수 기반 알고리즘으로, 많은 횟수의 해시 함수가 반복해서 사용된다. 해시 함수를 가속 연산해도, 그 횟수가 크기 때문에 SPHINCS+ 알고리즘은 다른 전자 서명 알고리즘보다 하드웨어 설계 후 큰 latency 를 가지는 특징이 있다. 이를 극복하기 위해 SPHINCS+ 알고리즘에서 사용되는 해시 함수들을 면밀하게 분석한다. 그 결과 같은 해시 함수에 대해서도 입출력 데이터 크기가 다양하게 변화하고, 서로 다른 데이터 플로우를 가지는 그 세부 차이점들을 파악하여, 이를 접목한 하드웨어 설계에 대해 논의한다.

• Journal of Internet Computing and Services
• /
• v.3 no.1
• /
• pp.71-80
• /
• 2002

UML is an object-oriented development methodology to graphically modeling, a software system, We are developed UML, graphics editor and its generating various design objects during software development cycle. Its design object compose of semantics information and View information manage using of RDBMS. Extant tools supporting UDML. however, it does not have an explicit format to describe and interchange its design abject intentionally, In this thesis, to overcome the drawback, the UML design object interchange and presents our efforts to make UML design objects highly interoperable. We developed an interchange format called UDXF(UML Design object exchange Format) based on XML UDXF is a simple and well-structured format to encode UML design objects. It leverages the tool interoperability, team development and reuse of design objects by interchanging the model information with the XML standard. Also, we propose design object repository manager for design object of UDXF format.

• Proceedings of the Acoustical Society of Korea Conference
• /
• 1993.06a
• /
• pp.13-16
• /
• 1993

본 연구에서는 공동주택의 바닥충격음 차음성능 향상을 위한 설계자료의 제시를 위해 천장구조가 서로 다른 공동주택을 대상으로 경량 및 중량 바닥충격음의 현장측정을 통하여 공동주택의 천장구조에 의한 바닥충격음 변화특성을 분석하고 차음성능을 평가하였다. 측정대상 건물에서 천장을 설치한 경우가 비교적 높은 충격음 차음성능 분포를 보이는 것으로 나타났으며, 바닥슬래브 하부 천장에 공기층과 완충재를 함께 설치하는 것은 기존 공동주택 등에서 경량 및 중량 바닥충격음 차음성능을 향상시키기 위한 효과적인 방안임을 확인하였다.

• Proceedings of the Korean Geotechical Society Conference
• /
• 2009.09a
• /
• pp.573-583
• /
• 2009

심부암반에 건설되는 지하공동의 형상과 규모는 지질구조, 암반조건 및 건설방법 (굴착, 보 강)에 따라 변화될 수 있으므로 이전에 사용해오던 공동의 크기와 형상을 그대로 답습하는 관행을 탈피하고 지하공동이 갖고 있는 특수한 용도와 목적에 따라 대형화, 심부화 추세로 가고 있는 지하공동의 설계개념을 수립하여야 한다.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.9 no.4
• /
• pp.980-985
• /
• 2008

The environment of IT is, currently, on its developing process to the period of web 2.0 and mashup which not only enable computer and internet to be utilized like the water or the air, but also be a new motivating force for its advance. One of the biggest changes of the industry that lies ahead is consolidated transportation. However, no party outstands as the leading party for nationwide improvement of logistics, nor does the right analysis and design for it. Therefore, successful nationwide logistics model is yet to exist. This study provides individual parties, which consider consolidated transportation model as their implementation and design of the framework, with instructions for logistics information system so that they could be competitive in the market. It also helps companies collect user requirements for logistics information system consolidated transportation, and utilize it for its development. Finally, the study provides a implementation and design of pilot system for consolidated transportation model.

• Journal of the Institute of Electronics Engineers of Korea TE
• /
• v.42 no.4
• /
• pp.69-76
• /
• 2005

In this paper, a 2 stage 6-pole bandpass filter(BPF) is designed and implemented by using triple-mode cavity for satellite payload system. The BPF has a 100MHz bandwidth at the center frequency of 14.5GHz(Ku-band) and the response of the filter is the Chebyshev function. The cavity filter uses two orthogonal $TM_{113}$ modes and one $TM_{012}$ mode. The coupling between the adjacent cavityes(intercavity coupling) results in a Chebyshev response and is accomplished by only H-filed component of If modes. The size and location of intercavity slot is determined by the coupling equation from E-and H-field of TE and TM resonant modes in circular cavity. The 2-stage 6-pole triple-mode cavity BPF has the insertion loss of 2.4dB and the reflection loss of 15dB in the passband. The triple-mode BPF proposed in this thesis can be used as channel filters for satellite payload system and can minimize filter assembly in general wireless communication system.

• The Journal of the Institute of Internet, Broadcasting and Communication
• /
• v.11 no.6
• /
• pp.157-162
• /
• 2011

In this study, we design and implement a cavity filter for the Korea T-DMB broadcasting transmitter station and repeater system. HFSS 3 dimensional field simulation tool is used for this study. T-DMB filter has to be high quality factor Q, and cavity filter is applying in T-DMB system due to high handling power. We use HFSS simulation tool for design to obtain exact resonant frequency with easy design. A cavity filter is implemented based on the simulated results, and test results are compared with simulations. Measured resonant frequency and bandwidth are 211.8MHz and 0.1MHz, and correspond with design values.

• The Journal of The Korea Institute of Intelligent Transport Systems
• /
• v.10 no.6
• /
• pp.91-97
• /
• 2011

In this study, we design and implement a cavity filter for the Korea T-DMB broadcasting transmitter station and repeater system. HFSS 3 dimensional field simulation tool is used for this study. T-DMB filter has to be high quality factor Q, and cavity filter is applying in T-DMB system due to high handling power. We use HFSS simulation tool for design to obtain exact resonant frequency with easy design. A cavity filter is implemented based on the simulated results, and test results are compared with simulations. Measured resonant frequency and bandwidth are 211.8MHz and 0.1MHz, and correspond with design values.