• Journal of KIISE:Computer Systems and Theory
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• v.36 no.6
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• pp.532-542
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• 2009

Dynamic Thermal Management (DTM) technique is generally used for reducing the peak temperature (hotspot) in the microprocessors. Despite the advantages of lower cooling cost and improved stability, the DTM technique inevitably suffers from performance loss. This paper proposes the DualFloating-Point Adders Architecture to minimize the performance loss due to thermal problem when the floating-point applications are executed. During running floating-point applications, only one of two floating-point adders is used selectively in the proposed architecture, leading to reduced peak temperature in the processor. We also propose a new floorplan technique, which creates Space for Heat Transfer Delay in the processor for solving the thermal problem due to heat transfer between adjacent hot units. As a result, the peak temperature drops by $5.3^{\circ}C$ on the average (maximum $10.8^{\circ}C$ for the processor where the DTM is adopted, consequently giving a solution to the thermal problem. Moreover, the processor performance is improved by 41% on the average by reducing the stall time due to the DTM.

• The KIPS Transactions:PartB
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• v.13B no.4 s.107
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• pp.429-438
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• 2006

Neural Networks(NNs) are applied for solving a wide variety of nonlinear problems in several areas, such as image processing, pattern recognition etc. Although NN can be simulated by using software, many potential NN applications required real-time processing. Thus they need to be implemented as hardware. The hardware implementation of multi-layer perceptrons(MLPs) in several kind of NNs usually uses a fixed-point arithmetic due to a simple logic operation and a shorter processing time compared to the floating-point arithmetic. However, the fixed-point arithmetic-based MLP has a drawback which is not able to apply the MLP software that use floating-point arithmetic. We propose a design method for MLPs which has the floating-point arithmetic-based fully-pipelining architecture. It has a processing speed that is proportional to the number of the hidden nodes. The number of input and output nodes of MLPs are generally constrained by given problems, but the number of hidden nodes can be optimized by user experiences. Thus our design method is using optimized number of hidden nodes in order to improve the processing speed, especially in field of a repeated processing such as image processing, pattern recognition, etc.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.11 no.1
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• pp.175-181
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• 2010

In this paper, we propose a novel hardware architecture for Rate control module for real time full HD video compression. In the proposed architecture, QP is updated by using the rate control algorithm to every the macroblock line(120MB for Full HD, 20MB for CIF image). Since there are many complex arithmetic and floating point arithmetic in rate control algorithm of JM for H.264, it is impossible to process the rate control algorithm using the integer arithmetic CPU core. So we adopted floating point arithmetic unit in our architecture, and implemented the rate control algorithm using the floating unit. With this implemented hardware, the implemented hardware is verified to be operated in real time.

• Journal of Life Science
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• v.22 no.8
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• pp.1132-1136
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• 2012

Many kind of cell stresses induce gene expression of unfolded protein response (UPR)-associated factors. This study demonstrated that up- and down-regulation of gene expression of endoplasmic reticulum (ER) stress chaperones and ER stress sensors was induced by immobilization stress in the rat organs (adrenal gland, liver, lung, muscle). However, no statistically significant regulation was detected in the others (heart, spleen, thymus, kidney, testis). The results are the first to show that immobilization stress induces UPR associated gene expression, will help to explain immobilization stress-associated ER stress.

• Proceedings of the Korea Information Processing Society Conference
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• 2005.11a
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• pp.921-924
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• 2005

지문인식 방법은 사람이 갖는 유일한 정보인 지문을 이용하여 문자 기반 인증 방법이 갖는 문제점을 해결할 수 있는 생체 인식 사용자 인증 방법이다. 많은 인식 방법들이 연구, 개발되었고 신뢰할 수 있는 인증 방법을 제공하기 위한 시도로 각종 방법들이 제안되고 또한 사용되고 있는데, 기존의 지문 인식 방법은 산술 연산과 수학적 접근을 주류로 하고 있기 때문에 부동 소수점 연산 프로세서(FPU)가 필요하다는 단점을 가지고 있다. 임베디드 시스템에서는 부동 소수점 연산 프로세서가 지원이 되지 않아 기존의 알고리즘들을 임베디드 시스템에 그대로 적용하기에는 문제가 있다. 따라서 본 논문에서는 이러한 단점을 극복하기 위해 기본적인 이미지 처리 및 특징점 추출 후, 수학적 연산을 최대한 배제한 알고리즘을 적용하여 인증을 수행하는 지문인식 방법을 제안한다.

• Journal of the Korean Chemical Society
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• v.51 no.6
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• pp.479-486
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• 2007

Bicarbonate 완충용액에서 Co-RDE를 이용하여 RDE 회전속도와 완충용액 속의 염화이온이 Co의 부식과 부동화에 미치는 영향을 연구하였다. Co-RDE의 회전속도가 부식에 미치는 영향은 Levich 식과 일치하였으며 부동화 막을 파괴하는데 염화이온의 효과가 큼을 알 수 있었다. 혼합 전위 이론을 사용하여 대류확산 조건에서 회전속도의 증가에 따라 부식전위가 양의 방향으로 증가하는 모형을 발견하였다. Tafel 영역에서 Co의 용해반응과 수소가 발생하는 환원반응은 전하이동과 물질이동을 이용하여 설명할 수 있었다.

• Journal of the Korean Institute of Telematics and Electronics
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• v.20 no.4
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• pp.24-29
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• 1983

In this paper, a floating-point processor which satisfied the subset of the proposed IEEE standard has been designed and realized by TTL chips. This processor consists of a floating-point arithmetic unit and a control sequencer. AHPL has been used in the design of sequencer. The execution times for the arithmetic operations were measured and compared with other microprocessor. The results had shown faster operations compared to the Z-80 processor. Though this processor was built by TTL chips, it could be fabricated as a one-chip processor.

• Journal of the Korean Geotechnical Society
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• v.19 no.2
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• pp.65-74
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• 2003

Most of land reclamation projects are being implemented along the south and west coastal lines of the Korean Peninsula. The earth structures and in-ground LNG tank, and buildings can be constructed using artificial freezing method on the reclaimed land to control the uplift pressure caused by capillary forces. In this study, upon freezing a saturated soil in a closed-system from the top, a considerable frost heaving pressure was developed. Decomposed granite soils, silty soil, and sandy soil were used in the laboratory freeze test which is sometimes subjected to thermal gradients under closed-systems. A major concern has been the ability to predict the frost heaving pressure over the results of relatively short-term laboratory tests. The frost heaving pressure arising within the soil samples and the temperature of the samples inside were monitored with time elapse. The degree of saturation versus heaving pressure curve is presented for each soil sample and the maximum pressure is closely related to this curve. TDR apparatus was used to measure the volumetric water content by the measurement of unfrozen water contents of frozen soils. Unfrozen water increased in soils containing a high percentage of fine-grained particles. In fine-grained soils with strong attractive farces between soil grains and water molecules, additional water is attracted into the pores leading to further volume changes and ice segregation.

• Journal of Genetic Medicine
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• v.4 no.2
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• pp.179-185
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• 2007

Purpose : Catecholamines are the neuro-transmitters in the sympathetic nervous system (SNS) and are activated by stress stimulus. Tyrosine hydroxylase (TH) and Dopamine-${\beta}$-Hydroxylase (DBH) are very important enzymes in the catecholamine synthesis. Corticotropin releasing hormone (CRH) is released in the process of reacting to stresses. The aim of this study is to find out what effects immobilization stresses have on the expression of TH, BDH and CRH mRNA in a rat's brains. Methods : We compare expression levels in rat's brains of TH, DBH and CRH mRNA induced by immobilization stresses between the test group and controled group. The expression levels of TH, DBH and CRH mRNA are measured by RT-PCR and the Western Blotting Analysis (WBA). Results : In brains and adrenal glands of the immobilization stress group, the expression levels of TH and DBH mRNAs are significantly two to three times higher (P<0.01), and CRH mRNAs are approximately one and a half times higher (P<0.05) than those of controlled group. Conclusion : This study suggest that the expression levels of TH, DBH and CRH mRNAs are activated by stress stimulus in a rat's brains and adrenal glands.

• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2018.06a
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• pp.61-61
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• 2018

듀플렉스 스테인리스강은 페라이트와 오스테나이트 상이 공존하는 특징을 갖는다. 그러한 구조에 의해서 페라이트와 오스테나이트상의 장점을 동시에 갖는 특성이 있다. 높은 강도와, 우수한 내식성, 응력 부식 균열 그리고 낮은 니켈의 함량 때문에 안정적인 가격을 갖는 장점을 갖기 때문에 운송, 기름과 가스, 해양플랜트, 건축 그리고 높은 강도와 우수한 내식성이 필요한 분야에서 수요가 증가할 것으로 사료된다. 이러한 듀플렉스 스테인리스강의 형성에서 페라이트와 오스테나이트상의 균형과 내식성을 개선하기 위해 질소가 첨가된다[1,2]. 본 연구는 저니켈 듀플렉스 스테인리스강(STS 329 FLD)의 공식 형성 과정에서 질소의 함량이 공식 형성과 내식특성에 미치는 영향을 동전위분극, XPS(X-ray Photoelectron Spectroscopy) 그리고 GDOES(Glow Discharge Optical Emission Spectrometry)를 이용하여 규명하였다. GDOES를 이용하여 깊이별 원소 분포를 정량적으로 비교한 결과, 부동태막에서 질소는 기저에 비하여 증가하였고, 질소의 함량이 증가함에 따라 wt.% 또한 증가하였다. 이러한 부동태막의 깊이별 원소 분포특성이 내식특성과 공식의 크기에 미치는 영향을 동전위분극을 이용하였다. 질소의 함량이 증가하였을 경우, 부식전위는 증가하였으며, 부식전류는 감소하였다. 또한 부동태전류가 감소한 것을 확인할 수 있었다. 이러한 차이의 원인을 확인하기 위하여 XPS를 이용하여 질소의 화학적 상태를 확인하였다. 질소는 암모니아의 형태로 존재하는 것으로 확인되었다. 암모니아 상태로 부동태막에 존재함에 따라 공식이 형성될 때, 암모늄 화함물을 형성하여 공식 내부의 산성도를 낮춤으로써 공식의 형성이 억제된 것으로 사료된다. 또한 공식 이후의 표면을 관찰 할 경우 질소의 함량이 증가함에 따라 표면에서 공식이 거의 관찰되지 않았다.