• The Magazine of the IEIE
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• v.23 no.11
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• pp.89-100
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• 1996

A new stage-sliced pipiline structure is presented to design a high speed real time Global Positional Systems(GPS) applications. The CORDIC algorothm was revised to generate a pipeline structure, which will be used to produce a large amount of trigonometric computations rapidly. A stage-sliced approach was introduced to adjust the number of interative processes, and thereby to control the precision of computation results. Both the computation and the control circuits of the proposed architecture are included in a pipeline stage, which are intergrated into a stage slice. The circuit was prototyped using six FPGA chips : one is used for glue logics and five of the chips are used for pipeline slice implementation. A single FPGA chip comprising 7 pipeline stages provides one pipeline slice. To compensate and inter-slice time delay, dummy cycles are introduced in inter-slice signal exchanges.

• Communications for Statistical Applications and Methods
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• v.16 no.4
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• pp.579-586
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• 2009

We have used multifactor dimensionality reduction(MDR) method to study interaction effect of statistical model in general. But MDR method cannot be applied in all cases. It can be applied to the only case-control data. So, two methods are suggested E-MDR and D-MDR method using regression tree algorithm and dummy variables. We applied the methods on the identify interaction effects of single nucleotide polymorphisms(SNPs) responsible for longissimus mulcle dorsi area(LMA), carcass cold weight(CWT) and average daily gain(ADG) in a Hanwoo beef cattle population. Finally, we compare the results using permutation test.

• Transactions of the Korean hydrogen and new energy society
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• v.28 no.6
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• pp.721-728
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• 2017

In this work, an one-dimensional analysis on spontaneous combustion in a coal stockpile was conducted using a commercial software $gPROMS^{(R)}$ based on assumption suggested by Arioy and Akgun. According to them, it is assumed that there is temperature difference between the surface of coal particle and the gas surrounded around the particle, and it is also assumed that the velocity of the gas is constant and thus oxygen is fed to the stockpile with same velocity. The higher temperature zone is formed to the surface of the coal stockpile at the initial phase and it became deepen as time is taken. Finally it was found that the temperature difference between coal particle and the gas was calculated as $57^{\circ}C$ and spontaneous combustion have not been occurred during 6 months since coal was piled in the stock.

• 한국전산유체공학회:학술대회논문집
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• 2008.03b
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• pp.711-714
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• 2008

The objective of this paper is to know the characteristics of pressure through a simplified typical carburetor used in small engines at the different throttle opening conditions. The carburetor is the device responsible for creating the right air-fuel mixture according to the different engine operating conditions. It is activated by the static or the dynamic pressure. The carburetor dummy is geometrically similar of LPG brush-cutter engine's diaphragm carburetor and is made of acrylic. Suction system gives body to crankcase vacuum using the vacuum pump and throttle opening conditions are controled by transfer device. Carburetor venturi throat and fuel charging tube diameter is each 20mm, 4.1mm. The result of the work presents an unprecedented phenomenon of suction pressure variation inside the carburetor venturi. It is predicted that these unprecedented pressure variation be caused by minor losses; sudden contraction or expansion, open or partially closed and so on.

• Journal of the Korean Society of Manufacturing Process Engineers
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• v.16 no.1
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• pp.24-29
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• 2017

There is a need for explosion experiments for explosion-related research. However, there are many restrictions in performing an actual experiment. Therefore, in this paper, an alternative method of overcoming the constraints of an explosion experiment has been conducted using a passenger behavior analysis program called MADYMO to assess and analyze the human body injury due to explosion load. To increase the reliability of the analysis, a drop test has been conducted with the analysis. We provide a new framework for performing the analysis. In future, we will further develop our research with the goal of reducing the opportunity cost for the study of the human body injury.

• Journal of Korean Tunnelling and Underground Space Association
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• v.3 no.1
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• pp.3-9
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• 2001

The investigation of the fragmentation of blasted rocks is particularly important because it is a measure of the blast efficiency. The degree of fragmentation has a major effect on the efficiency of the loading and crushing operations. Getting such an information on the large pile of blasted rock is not an easy operation. This paper presents the results of case study to evaluate the performance of two types of tunnel blasting: V-cut and burn cut. The digital images of muckpiles were analyzed to produce size distribution and it was compared with those of predictive equations.

• Proceedings of the Korea Contents Association Conference
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• 2005.05a
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• pp.341-345
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• 2005

In this paper, we propose an algorithm for the approximation of FIR filters by IIR filters. The algorithm is based on a concept of the balanced model reduction. Head-related transfer functions(HRTFs) of dummy-head are approximated by 32-order IIR filters. The binaural sounds using the approximated HRTFs are reproduced by headphone, and serves as a cue of sound image localization. Experiment of sound image are carried out for 10 participants with computer simulation and DSP board respectively. The results of the experiments show that the localization using the approximated HRTFs by IIR filters is the same accuracy as the case of FIR filters that simulate the HRTFs.

• Proceedings of the Korean Information Science Society Conference
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• 2006.06c
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• pp.286-288
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• 2006

개인정보의 유출을 방지하는 것은 유비쿼터스 컴퓨팅 서비스의 주요 이슈중 하나이다. 대표적인 유비쿼터스 서비스인 위치기반 서비스(LBS)는 개인의 위치 정보를 바탕으로 서비스를 제공한다. 이런 개인의 위치 정보는 개인 정보와 밀접한 연관이 있기 때문에, 개인의 위치 정보 노출을 방지하는 것은 위치 기반 서비스의 필수 과제이다. 본 논문에서는 서비스 업체가 개인의 위치 정보를 파악 또는 추적하는 것을 방지하기 위해 개인의 실제 이동경로와 거짓 이동경로를 함께 보내는 알고리즘을 제안한다. 기존의 알고리즘은 이러한 거짓 이동경로를 단순한 랜덤 값을 기반으로 생성했기 때문에 서비스 제공자가 실제 사용자의 이동경로와 거짓 이동경로를 쉽게 구별할 수 있었다. 본 논문에서는 거짓 이동경로를 다른 사용자의 이동경로와 GIS 정보를 바탕으로 생성하는 알고리즘을 제안한다. 본 논문에서 제안하는 알고리즘은 실제 사용자와 비슷한 이동경로를 갖는 거짓 이동경로를 생성하기 때문에 익명성을 향상시킬 수 있다.

• Journal of the Korea Furniture Society
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• v.14 no.1
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• pp.23-34
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• 2003

이 논문은 우리 환경의 생태계 보호를 위하여 뉴 디자인 가구가 어떻게 창조되고 있는지를 연구하였다. 즉, 오늘날 포스트 모던 시대에 뉴 디자인 가구 디자이너들이 환경 문제의 해결점의 하나로 새롭고 다른 방향으로 자신들의 가구를 창조할 수 있는가에 관한 담론이다. 우리가 안고 있는 생태계 보호를 위한 가구를 디자인할 때 필요한 재사용 및 재활용이 가능한 재료들, 유행을 초월한 가구, 가구의 견고성, 대량 생산 가구 등이 심각하게 분석되었다. 이 분석에 따르면 뉴 디자인 가구 디자이너들은 재활용된 재료들, 주거 환경 및 지속성, 새로운 가구 미학을 내포한 새로운 가구 디자인 철학을 얻을 수 있었다. 대량 생산된 가구는 경제성 때문에 많은 대중에게 접근되는 좋은 점보다는 우리에게 더 많은 쓰레기 더미를 준다라는 사실이 뉴 디자인 가구 다자이너들에게는 매우 심각한 문제였다. 따라서 가구 디자이너들이 양보다는 질에 중점을 둔 가구를 창조하는 것이 필요하다는 것이다. 결론적으로 환경적 책임을 느낀 뉴 디자인 가구 디자이너들은 튼튼하면서 재활용될 수 있으며 유행을 초월한 기능적이면서도 미적인 가구를 창조할 때만이 뉴 디자인 가구론 구입하는 소비자들이 뉴 디자인 가구를 올바른 방향에서 인식할 수 있을 것이다.

• Korean Journal of Logic
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• v.8 no.1
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• pp.69-88
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• 2005

Hume's principle says that the number of Fs is the same as the number of Gs iff there are just as many Fs as Gs. Frege seems to suggest at Grundlagen $\S64$ that (i) the content of the two sentences are the same, (ii) the left hand side sentence is a result of 'carving up the content' of the right hand side in a new way, (iii) 'the true order of things' are from the right to left rather than the other way round. We examine here if there is a room for arguing these three theses altogether within Frege's philosophy, and give a positive answer to it.