• Proceedings of the Korea Contents Association Conference
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• 2006.11a
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• pp.565-569
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• 2006

This paper reviews some loop partitioning techniques such as loop splitting method by thresholds and Polychronopoulos' loop splitting method for exploiting parallelism from single loop which already developed. We propose improved loop splitting method for maximizing parallelism of single loops with non-constant dependence distances. By using the distance for the source of the first dependence, and by our defined theorems, we present generalized and optimal algorithms for single loops with non-uniform dependences. The algorithms generalize how to transform general single loops into parallel loops.

• The Journal of the Acoustical Society of Korea
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• v.11 no.4
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• pp.36-44
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• 1992

To reduce the redundancy within samples that resulted from uniform sampling method, nonuniform sampling or nonredundant-sample coding methods can be considered. But it is well-known that when conventional nonuniform sampling methods are applied directly to speech signal, the amount of data required is comparable to or more than that required by uniform sampling method like PCM. To overcome this problem, we consider properties of speech signal in the sense of perception, and suggest a nonuniform sampling method at the maxima and minima of speech wave. To analyze the performance of the suggested method, compression ratio is considered. We show that compression ratio can be improved by silence detection, which can't be implemented by conventional methods based on uniform sampling. As experimental results, compression ratios of 1.54 without silence detection and 2.88 with silence detection for 8kHz 8-bit PCM signals are obtained.

• Korean Journal of Soil Science and Fertilizer
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• v.30 no.1
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• pp.94-98
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• 1997

This experiment was conducted to investigate the distribution of the soil microflora of Daekwanryung highlands of Kwangwon Province. It was found that soil microorganisms each as Bacteria, Actinomycetes, Fungi, Pseudomonas spp. and Erwnia sp. were mostly in the top 0-15 cm profile. It also was found that soil microflora population was affected in many ways by kind of cropping plant. The number of Erwinia sp. that is one of the soil born plant pathogenic bacteria was more abundant in potato field than chinese cabbage soil. It was also studied difference of mountain and grassland soils from cropping soils.

• Journal of Broadcast Engineering
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• v.22 no.2
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• pp.207-213
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• 2017

In order to accurately perform multispectral imaging using a multiplexed illumination, intensity of illumination in a scene must be uniform. For image acquisition that requires accurate color information, even if not multispectral imaging, the illumination information must be accurate, and a flat light source or illumination calibration is performed for accurate illumination characteristics. In this paper, we propose a method of color correction to uniformly illuminate an image with non-uniform illumination intensity. The proposed method uses multispectral imaging instead of illumination calibration for color correction. First of all, we perform multispectral imaging with two images obtained from non-uniformity illumination to acquire spectral reflectance. The obtained reflection spectrum is relit as the illumination characteristic of the image obtained from general planar light such as fluorescent light or sunlight. By comparing the image obtained by relighting with the uniformly illuminated image, the non-uniformity of the illumination is confirmed, and the color correction is performed as the image obtained from the uniform image. It is expected that the experimental results will confirm whether the non-uniformity of the illumination is uniformly corrected and reduce the restriction of illumination in obtaining the color information of the image.

• Proceedings of the Korean Vacuum Society Conference
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• 2011.08a
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• pp.401-401
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• 2011

태양전지 제작에 있어서 에미터층의 최적화를 위해 POCl 도핑시 에미터층의 면저항 가변에 중요한 파라미터인 온도와 가스비를 변화하여 실험을 진행하였다. 본 실험에 사용될 최초 기판은 두께가 200${\pm}$5 ${\mu}m$, 비저항이 0.5~0.3 ${\Omega}{\cdot}cm$의 P-type(100) 실리콘 기판을 사용하였으며 먼저 POCl3양과 deposition 시간 그리고 산소와 질소의 양을 고정시키고 온도에 따른 에미터 면저항 변화를 알아보았다. 온도는 830, 840, 850, 860, 870, 880$^{\circ}C$로 가변시켰으며 공정온도가 높아질수록 면저항 값이 낮아짐을 알 수 있었다. 균일도는 낮은 온도에서는 다소 좋지 않았지만 온도가 높아질수록 점차 좋아졌으며 870$^{\circ}C$ 이상에서는 거의 균일한 값을 얻을 수 있었다. 한편, 이번에는 공정온도를 고정하고 산소와 POCl3 가스량의 변화에 따른 면저항 특성과 균일도를 알아보았다. 가스비와 압력 그리고 위치별 면저항 특성에 대해서 알아보았고 부분압이 증가함으로 반응로 내의 O2의 양이 증가함을 알 수 있었다. 증가한 O2는 도핑과정에서 산화막을 더 두껍게 형성하게 하며 높은 면저항 값을 가져오게 하였다. 즉, 충분한 가스량의 주입으로 도핑시 균일도를 향상시킬 수 있었다. 이와 같이 부분압이 증가함에 따라 면저항의 증가와 균일도의 향상을 가져왔다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.23 no.6
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• pp.1419-1424
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• 1998

In phased array antennas that scan elevation, the number of radiator rows is one of the important factors to minimizing both cost and weitht. Therefore, the antenna tilt angles having relation with element spacing are among the improtant design parameters. The exact optimum tilt angles for several types of uniformly and nonuniformly excited arrays are obtained theoretically. Four types of uniform linear arrays and Chebyshev array factors as a nonuniformly excited arrav are considered.

• Proceedings of the Korea Society of Poultry Science Conference
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• 2002.11a
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• pp.64-84
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• 2002

These studies were conducted to evaluate the Properties of lactic acid Producing bacteria(LAB), isolated from broiler and laying hens cecum and select the optimum strains to improve the performance, environment of poultry house, immunity, and intestinal microflora of broiler and laying hens. In experiment I , 23 LAB strains were isolated from broiler and laying hens cecum as a colony form. Six strains were selected by acid tolerance, bile salt tolerance, viability, enzyme release, antagonism, and antibiotics susceptibility. In Experiment II, selected LABs from Ex. 1 were conducted to investigate the effects of feeding various Lactobacillus on performance, nutrients digestibility, intestinal microflora, villi development and observation of epithelium surface, blood chemicals and fecal noxious gas of broiler chicks. One thousand eighty one day old broiler chicks were fed into Lactobacillus crispatus avibrol(LCB), Lactobacillus reuteri avibro2(LRB), Lactobacillus crispatus avihen1(LCH), and Lactobacillus vaginalis avihen2(LVH) at the level of 10$^4$ and 10$\^$7/cfu/g diet. Weight gam of chicks fed Lactobacillus tended to increase from the first week and was higher from 50 to 100g in Lactobacillus treatments than control. Feed intake and feed conversion were not statistically different of all treatments. Dry Matter digestibility of Lactobacillus treatments was prone to improve compared to that of control, but was not significantly different. Protein and Ca digestibility were also tended to improve in Lactobacillus treatments relative that of control. Lactobacillus treatments showed improved tendency in crude ash and fat compared to those of control, whereas phosphorus digestibility was not consistency. Nutrients digestibilities of bird fed LCH were superior to those of other treatments, It showed significantly higher in Ca and P digestibility than control(P〈0.05). Total Lactobacillus spp. of birds fed various Lactobacillus was significantly higher in illeum for five weeks(P〈0.05), but was not different at cecum. Yeast was thought to be not completely attached to intestinal lumen for one week. However, total number of yeast was significantly increased in cecum and illeum of three weeks old chicks (P〈0.05). The number of anaerobes exhibited to tendency the increase in Lactobacillus treatments from one week old of age at both ileum and cecum.

• Proceedings of the KIEE Conference
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• 2015.07a
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• pp.734-736
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• 2015

본 논문은 비균일 공극형 단상 4/4극 하이브리드 스위치드릴럭턴스 전동기(이하, HSRM)를 제안한다. 제안된 HSRM의 회전자 형상은 비균일한 공극을 갖는 형상으로 데드존 구간과 토크리플, 출력특성에 기여한다. 이와 같은 특성을 검증하기 위해 균일한 공극을 갖는 단상 하이브리드 SRM의 토크 및 출력특성을 유한요소해석(FEA)을 통해 비교하였다. 그 결과 제안된 HSRM을 제작하였고 시험 결과를 통해 그 타당성을 검증하였다.

• Journal of the Korean Society of Hazard Mitigation
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• v.9 no.2
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• pp.11-15
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• 2009

This paper is concerned with the elastic buckling of thin-walled arches that are subjected to uniform bending. Nonlinear strain-displacement relations with the initial curvature are substituted into the second variation of the total potential energy to obtain the energy equation including initial curvature effects. The approximation for initial curvature effects that the bending normal strain distribution is linear across the cross section is applied consistently in the derivation process. The closed form solution is obtained for flexural-torsional buckling of arches under uniform bending and, it is compared with the previous theoretical results.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2020.07a
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• pp.662-663
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• 2020

최근 MPEG 에서는 인공신경망 모델을 다양한 딥러닝 프레임워크에서 상호운용 가능한 포맷으로 압축 표현할 수 있는 NNR(Compression of Neural Network for Multimedia Content Description and Analysis) 표준화를 진행하고 있다. 본 논문에서는 MPEG-NNR 에서 CNN 모델을 압축하기 위한 지역 비선형 양자화(Local Non-linear Quantization: LNQ) 기법을 제시한다. 제안하는 LNQ 는 균일 양자화된 CNN 모델의 각 계층의 가중치 행렬 블록 단위로 추가적인 비선형 양자화를 적용한다. 또한, 제안된 LNQ 는 가지치기(pruning)된 모델의 경우 블록내의 영(zero) 값의 가중치들은 그대로 전송하고 영이 아닌 가중치만을 이진 군집화를 적용한다. 제안 기법은 음성 분류를 위한 CNN 모델(DCASE Task)의 압축 실험에서 기존 균일 양자화를 대비 동일한 분류 성능에서 약 1.78 배 압축 성능 향상이 있음을 확인하였다.