• Journal of Korea Spatial Information System Society
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• v.4 no.2 s.8
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• pp.55-64
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• 2002

VEfficient generation of road data is one of the most important issues in GIS (Geographic Information System). In this paper, we propose a hybrid approach for automatic generation of road data by combining mobile mapping and image processing techniques. Mobile mapping systems have a form of vehicle equipped with CCD camera, GPS, and INS. They can calculate absolute position of objects that appear in acquired image by photogrammetry, but it is labor-intensive and time-consuming. Automatic road detection methods have been studied also by image processing technology. However, the methods are likely to fail because of obstacles and exceptive conditions in the real world. To overcome the problems, we suggest a hybrid method for automatic road generation, by exploiting both GPS/INS data acquired by mobile mapping system and image processing algorithms. We design an estimator to estimate 3-D coordinates of road line and corresponding location in an image. The estimation process reduces complicated image processing operations that find road line. The missing coordinates of road line due to failure of estimation are obtained by cubic spline interpolation. The interpolation is done piecewise, separated by rapid change such as road intersection. We present experimental results of the suggested estimation and interpolation methods with image sequences acquired by mobile mapping system, and show that the methods are effective in generation of road data.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.25 no.5A
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• pp.743-750
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• 2000

In this paper, low-power block filtering architecture for digital If down sampler and up sampler is proposed. Software radio technology requires low power and cost effective digital If down and up sampler. Digital If down sampler and up sampler are accompanied with decimation filter and interpolation filter, respectively. In the proposed down sampler architecture, it is shown that the parallel and low-speed processing architecture can be produced by cancellation of inherent up sampler of block filter and down sampler. Proposed up sampler also utilizes cancellation of up sampler and inherent down sampler of block filtering structure. The proposed architecture is compared with the conventional polyphase architecture.

• Journal of the Institute of Electronics Engineers of Korea SD
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• v.37 no.5
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• pp.16-22
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• 2000

This paper presents a compression algorithm applicable for transmitting a HPO hologram data. The proposed algorithm exploits a modulating function to compress the bandwidth of the hologram pattern, resulting in decimation due to relaxed Nyquist sampling constraints. At the receiver, the compressed data will be interpolated and compensated via being divided by the modulating function. We also present compression rate and analyze the resolution of a reconstructed image and the periodicity of harmonic interferences. Finally, we shows the validity of the proposed algorithm by simulation where a reconstructed image from undersampled data is compared with a reconstructed image obtained through decimatioin by modulating function, interpolation and compensation.

• Journal of the Korean Geographical Society
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• v.47 no.5
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• pp.755-774
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• 2012

The main objective of the study is to propose GIS-based methods to assess the population distribution criteria for undesirable facilities such as nuclear power plants. First of all, a review of the relevant criteria was conducted for the official documents compiled by such institutions as IAEA (International Atomic Energy Agency), U.S. NRC (Nuclear Regulatory Commission), and some national institutes including the Korea Institute of Nuclear Safety. It is informed from the review that the fundamental principle underlying the various criteria is to maximize the distance between a plant and the nearest population center. It is realized that two interrelated GIS-based techniques need to be devised to put the principle into practice; sophisticated ways of representing population distribution and identifying population centers. A dasymetric areal interpolation is proposed for the former and cell-based and area-based critical density methods are introduced. Grid-based population distributions at various spatial resolutions are created by means of the dasymetric areal interpolation. By applying the critical density methods to the gridded population distribution, some population centers satisfying the population size and density criteria can be identified. These methods were applied to the case of the Gori-1 nuclear power plant and their strengths and limitations were discussed. It was revealed that the assessment results could vary depending upon which method was employed and what values were chosen for various parameters. This study is expected to contribute to foster the applications of methods and techniques developed in geospatial analysis and modeling to the site selection and evaluation.

• Proceedings of the IEEK Conference
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• 2001.06b
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• pp.45-48
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• 2001

An programmable current-mode folding and interpolation analog to digital converter (ADC) with programmable interpolator is proposed in this paper. A programmable interpolator is employed not only to vary the resolution of data converter, but also to decrease a power dissipation within the ADC. Because of varying the number of interpolation circuits, resolution is vary from 6 to 10bit. The designed ADC fabricated by a 0.6${\mu}{\textrm}{m}$ n-well CMOS double metal/single poly process. The experimental result shows the power dissipation from 26 to 87mW with a power supply of 3.3V.

• Proceedings of the IEEK Conference
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• 1999.06a
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• pp.986-989
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• 1999

An 12bit current-mode folding and interpolation analog to digital converter (ADC) with multiplied folding amplifiers is proposed in this paper. A current - mode multiplied folding amplifier is employed not only to reduced the number of reference current source, but also to decrease a power dissipation within the ADC. The designed ADC fabricated by a 0.6${\mu}{\textrm}{m}$ n-well CMOS double metal/single poly process. The simulation result shows the power dissipation of 280㎽ with a power supply of 5V.

• Proceedings of the Korean Institute of Communication Sciences Conference
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• 2004.11a
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• pp.223-223
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• 2004

• The Journal of the Acoustical Society of Korea
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• v.21 no.3
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• pp.293-303
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• 2002

This paper implements optimized Time Scale Modification (TSM) system using ITU G.729 speech decoder and Dual SOLA algorithm. The proposed system assume 8 Kz sampling rate, 80 samples/frame input speech from the ITU G.729 speech Decoder and the TSM (Time Scale Modification) feature of Dual SOLA produces the high quality output speech that was slow-down or speed up as a user's choice. Especially, the proposed Optimized Dual SOLA base on various simulations and theoretical analysis, and the additional interpolation procedure of the speech makes it possible to setup high performance integrated TSM system at the maximum time scale modification rate. The system performance is analyzed and verified with various input speech and playback speed.

• The Journal of the Acoustical Society of Korea
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• v.40 no.6
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• pp.571-577
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• 2021

This study is a study on System On Chip (SOC) that implements virtual engine sound in electric vehicles without engines, and realizes vivid engine sound by combining Adaptive Difference PCM (ADPCM) method and frequency modulation method for satisfaction of driver's needs and safety of pedestrians. In addition, by proposing an electronic sound synthesis algorithm applying Musical Instrument Didital Interface (MIDI), an engine sound synthesis method and a constitutive model of an engine sound generation system are presented. In order to satisfy both drivers and pedestrians, this study uses Controller Area Network (CAN) communication to receive information such as Revolution Per Minute (RPM), vehicle speed, accelerator pedal depressed amount, torque, etc., transmitted according to the driver's driving habits, and then modulates the frequency according to the appropriate preset parameters We implemented an interaction algorithm that accurately reflects the intention of the system and driver by using interpolation for the system, ADPCM algorithm for reducing the amount of information, and MIDI format information for making engine sound easier.

• Journal of Biomedical Engineering Research
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• v.15 no.3
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• pp.245-252
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• 1994

의료용으로 사용되는 초음파 진단장치와 PC간의 인터페이스를 통해서 초음파 의료 영상 정보를 관리할 수 있는 시스템을 구현하였다. 초음파 진단장치와 PC간의 양방향 데이터 전송이 가능하도록 양방향 인터페이스 카드를 하드웨어로 제작하였고, 이에 맞는 통신 프로토콜을 구현하였다. 또한 영상 정보의 데이터 베이스를 구축하기 용이하도록 영상 파일의 형태를 새로이 정의하였으며 진단장치에서 디스플레이되는 영상을 PC에 맞도록 좌표 변환해서 디스플레이할 수 있도록 소프트웨어를 구현하였다. 특히, 초음파 진단장치의 컨벡스(convex)와 섹터(sector)의 의료영상을 PC에서 디스플레이하기 위해 위치지정과 인터폴레이션(interpolation)기법을 적용하였다. 본 시스템의 타당성을 입증하기 위해서 진단장치와 PC에서 디스플레이되는 영상을 서로 비교함으로써 전송시 영상의 좌표변환이 성공적으로 이루어졌음을 증명하였다.