RSM 법에 의한Li₂O-Al₂O₃-SiO₂ (LAS) 유리의 소결 거동과 결정화에 대한 연구

이규호,김영석,정영준,김태호,서진호,류봉기,Lee, Kyu-Ho,Kim, Young-Seok,Jung, Young-Joon,Kim, Tae-Ho,Seo, Jin-Ho,Ryu, Bong-Ki 한국세라믹학회 2007 한국세라믹학회지 Vol.44 No.8

This paper presents results and observations obtained from a study of sintering behavior and crystallization in $Li_2O-Al_2O_3-SiO_2$ (LAS) Glass by screen printing method. The variable experimental conditions were determined carefully by Thermal-Mechanical Analyzer (TMA), Differential Thermal Analyzer (DTA) for setting the optimum transparent sintering conditions in LAS glass system, $10.5Li_2O-14.7Al_2O_3-58.1SiO_2-16.7B_2O_3(wt%)$, such as glass-ceramics which usually have low crystallization temperatures. Crystallization glasses generated during sintering was observed from diffraction patterns by X-Ray Diffraction (XRD), transmittance by UV-Vis spectrometer. Finally, the optimum sintering condition of LAS glass and the relation between factors and results in several sintering conditions were given by using Response Surface Methodology (RSM). From this study, we confirmed that crystallization interrupted densification during glass powder sintering. Furthermore, we observed that main effect of factors in glass powder sintering with concurrent crystallization depended on experimental conditions from main effects plot by MINTAB-14.

이유시기가 한우 송아지의 발성빈도에 미치는 영향

이규호,유정원,김상욱,정왕용,이원현,이상락,Lee, Kyu-Ho,Yu, Jung-Won,Kim, Sang-Wook,Jung, Wang-Yong,Lee, One-Hyun,Lee, Sang-Rak 한국축산환경학회 2014 한국축산시설환경학회지 Vol.20 No.4

This study was conducted to investigate the effect of weaning period on the vocalization frequency of Hanwoo calf. Twelve Hanwoo calves were allocated into 4 groups, control (forced weaning on 90days) and treatment (weaning on 70, 90 and 120days with 5 adaptation days). After weaning, behavior and vocalization of Hanwoo calves were recorded on 3 consecutive days with closed circuit television (DTC-R5254, Digite Co., Ltd., Korea) and digital audio tape recorder (SR-900, Idamtech Co., Ltd., Korea). Vocalization frequency of Hanwoo calf were not significance difference with control and treatment group. Thus, additional studies of feed intake and body weight gain were needed to determine the weaning period of Hanwoo calves.

국산박류의 사료적 가치에 관한 연구 9 . 제독피마자박의 사료가치에 관한 시험

이규호,한인규,정천용 ( Kyu Ho Lee,In K . Han,Chon Yong Chung ) 한국축산학회 1978 한국축산학회지 Vol.20 No.2

This experiment was carried out using 440 broiler chicks to study the nutritive value of detoxicated castor bean meal for about 75 days when it was used in broiler rations. The castor bean meal used in this experiment was detoxicated by the method of autoclaving at 120℃ and 1㎏/㎠ pressure and then water treatment. The results obtained are summarized as follows: 1. The body weight gains were significantly different (P$lt;0.01) among treatments. Data revealed that the body gain was decreased as the level of castor bean meal increased in feed. The treatments 6, 10, 9, 2 and 3 containing the castor bean meal less than 5% in their rations were not significantly different with control group in body weight gain. 2. The weight gain of treatments 5 containing the castor bean meal up to 20% was significantly inferior to the ether treatments and some birds in this treatment have shown coma symptom during 1-2 weeks of age. 3. Feed required per ㎏ of body weight gain were significantly increased (P$lt;0.05) as the level of castor bean meal increased. However, among the treatments substituting castor bean meal for perilla oil meal or sunflower seed oil meal differences were not significant in feed efficiency. 4. The content of crude protein, crude fat and crude fiber of castor bean meal was 37.5%, 6.7% and 26.8%, respectively. Amino acid composition of castor bean meal was relatively superior to sunflower seed oil meal, similar to perilla oil meal and inferior to soybean meal. 5. It was found that the utilizability of dry matter, crude protein, crude fat and total carbohydrates of finisher diets were depressed as the level of castor bear meal increased in feeds. 6. The carcass rate was decreased (P$lt;0.05) in same trend as weight gain did and the carcass rate of treatment 5 was significantly inferior to the other treatments. 7. The values of thyroid gland weight, skin pigmentation score and serum cholesterol content were no significantly affected by the feeding castor bean meal.

적응형 인자 모델을 이용한 개선된 진공펌프 상태진단에 관한 연구

이규호,이수갑,임종연,정완섭,Lee, Kyu-Ho,Lee, Soo-Gab,Lim, Jong-Yeon,Cheung, Wan-Sup 한국진공학회 2011 Applied Science and Convergence Technology Vol.20 No.3

본 논문에서는 건식 진공펌프에서 측정한 다중 변수로 구성된 배치데이터의 통계적인 특성을 소개한다. 흡입구 및 배출구 압력과 부스터/드라이 펌프의 소비전류와 같은 상태변수의 변위분포는 2개나 3개의 특정적인 구간으로 나뉘는 특성이 있다. 이런 관측을 통해 발견한 통계학적 특성을 나타내기 위해 적응형 인자 모델(APM)을 사용하였다. APM 모델기반의 배치 데이터는 건식 진공펌프의 상태를 진단하는데 적절함을 증명하였고, 이전의 동적 시간 왜곡 알고리즘과 비교하였을 때 계산시간 및 필요 메모리 면에서 효율적임을 확인하였다. This paper introduces statistical features observed from measured batch data from the multiple operation state variables of dry vacuum pumps running in the semiconductor processes. The amplitude distribution characteristics of such state variables as inlet pressures, supply currents of the booster and dry pumps, and exhaust pressures are shown to be divided into two or three distinctive regions. This observation gives an idea of using an adaptive parametric model (APM) chosen to describe their statistical features. This modelling, in comparison to the traditional dynamic time wrapping algorithm, is shown to provide superior performance in computation time and memory resources required in the preprocessing stage of sampled batch data for the diagnosis of running dry vacuum pumps. APM model-based batch data are demonstrated to be very appropriate for monitoring and diagnosing the running conditions of dry vacuum pumps.

주파수 영역에서의 Gaussian Mixture Model 기반의 동시통화 검출 연구

이규호,장준혁,Lee, Kyu-Ho,Chang, Joon-Hyuk 한국음향학회 2009 韓國音響學會誌 Vol.28 No.4

In this paper, we propose a novel method for the cross-correlation based double-talk detection (DTD), which employing the Gaussian Mixture Model (GMM) in the frequency domain. The proposed algorithm transforms the cross correlation coefficient used in the time domain into 16 channels in the frequency domain using the discrete fourier transform (DFT). The channels are then selected into seven feature vectors for GMM and we identify three different regions such as far-end, double-talk and near-end speech using the likelihood comparison based on those feature vectors. The presented DTD algorithm detects efficiently the double-talk regions without Voice Activity Detector which has been used in conventional cross correlation based double-talk detection. The performance of the proposed algorithm is evaluated under various conditions and yields better results compared with the conventional schemes. especially, show the robustness against detection errors resulting from the background noises or echo path change which one of the key issues in practical DTD. 본 논문에서는 주파수 영역에서의 가우시안 혼합 모델 (Gaussian Mixture Model, GMM) 기반의 새로운 동시통화 검출 (Double-talk Detection, DTD) 알고리즘을 제안한다. 구체적으로 주파수 영역에서의 음향학적 반향억제 (Acoustic Echo Suppression, AES)를 위한 동시 통화 검출 알고리즘을 구성하기 위해 기존의 시간 영역에서의 동시통화 검출에 사용되는 상호 상관계수를 이산 푸리에 변환을 통해 16개 채널의 주파수 영역으로 변환하였다. 이러한 주파수 영역에서의 상호 상관계수를 GMM의 보다 효과적인 구성을 위해 통계적 분류 특성에 근거하여 우수한 7개를 선별하였다. 본 논문은 이러한 특징 벡터로 패턴인식에서 우수한 성능을 보이는 GMM을 구성하였으며 원단화자만 있는 구간, 동시통화 구간, 근단 화자만 있는 구간을 우도 (Likelihood) 비교에 따라 분류함으로써 별도의 원단 화자 신호에 대한 음성 검출기 (Voice Activity Detector, VAD)의 사용 없이 잡음환경과 반향 경로 변화에서 강인한 동시통화 검출 알고리즘을 제안한다. 다양한 실험 결과 제안된 방법은 기존의 상호 상관계수를 고정된 문턱 값과 가부 비교하여 동시 통화 구간을 검출하는 hard decision 방법에 비해 검출 오류 확률 (Detection Error Probability)을 비교한 결과 우수한 성능을 보였다.

GZO 타겟 결정성에 따른 박막의 전기적 광학적 특성

이규호,김경환,Lee, Kyu-Ho,Kim, Kyung-Hwan 한국전기전자재료학회 2012 전기전자재료학회논문지 Vol.25 No.2

In this research, we prepared Ga doped zinc oxide(ZnO:Ga, GZO) targets each difference sintering temperature $700^{\circ}C$, $800^{\circ}C$, and doping rate 1 wt.%, 2 wt.%, 3 wt.%. The characteristics of thin film on glass substrates which deposited by facing target sputtering in pure Ar atmosphere are reported. Ga doped zinc oxide film is attracted material through low resistivity, high transmittance, etc. When prepared target powder's structure was investigated by scanning electron microscope, densification and coarsening by driving force was observed. For each ZnO:Ga films with a $Ga_2O_3$ content of 3 wt.% at input power of 45W, the lowest resistivity of $9.967{\times}10^{-4}{\Omega}{\cdot}cm$ ($700^{\circ}C$) and $9.846{\times}10^{-4}{\Omega}{\cdot}cm$ ($800^{\circ}C$) was obtained. the carrier concentration and mobility were $4.09{\times}10^{20}cm^{-3}$($700^{\circ}C$), $4.12{\times}10^{20}cm^{-3}$($800^{\circ}C$) and $15.31cm^2/V{\cdot}s(700^{\circ}C)$, $12.51cm^2/V{\cdot}s(800^{\circ}C)$, respectively. And except 1 wt.% Ga doped ZnO thin film, average transmittance of these samples in the range 350-800 nm was over 80%.

VR 환경 내 시선 추적을 위한 안구 3D 모델링에 관한 연구

이규호(Kyu Ho Lee),이세훈(Se Hun Lee),김건희(KunHee Kim),이용우(Yongwoo Lee),이지후(Jihu Lee),윤기성(Ki Sung Yoon),이용은(Yong Eun Lee),석윤찬(Yunchan Suk),백승준(Seung Jun Baek) 한국통신학회 2018 한국통신학회 학술대회논문집 Vol.2018 No.11

객체 모델을 이용한 Publish-Subscribe 기반 통신 미들웨어에 관한 연구

이규호(Lee Kyu Ho),심준용(Shim Jun Yong),위성혁(Wi Soung Hyouk) 한국통신학회 2014 한국통신학회 학술대회논문집 Vol.2014 No.6

증례 : 혈액종양 ; 백혈병의 증거 없이 발견된 과립구 육종 2예

이규호 ( Kyu Ho Lee ),김현 ( Hyun Kim ),최관용 ( Guan Yong Choi ),이주희 ( Ju Hee Lee ),한혜숙 ( Hye Suk Han ),이기형 ( Ki Hyeong Lee ),김승택 ( Seung Taik Kim ) 대한내과학회 2009 대한내과학회지 Vol.77 No.2

과립구 육종은 백혈병의 진행 도중 또는 이후에 합병증으로 생기는 경우가 대부분이나 드물게 백혈병의 증거 없이 비전형적으로 발견되는 경우가 있을 수 있다. 저자들은 혈액이나 골수에서 백혈병의 증거 없이 소장 및 부신을 포함한 다발성 복강 내 종괴로 내원한 과립구 육종 1예와 흉추에 발생하여 양측 하지 마비를 유발한 과립구 육종 1예를 경험하였기에 보고하는 바이다. Granulocytic sarcoma (GS) is a rare extramedullary tumor composed of immature myeloid precursor cells. GS is associated with acute or chronic myeloid leukemia; it has rarely been reported in non-leukemic patients. We report two cases of GS with unusual presentations; neither had bone marrow involvement. The first case was a GS presenting with multiple intra-abdominal masses in a 43-year-old man. Computed tomography (CT) of the abdomen showed masses in the small bowel and right adrenal gland. The second case was a patient with a GS presenting with symptoms of spinal cord compression in a 32-year-old man. Magnetic resonance imaging (MRI) showed an extradural mass in the spinal canal at the T3-T5 levels. Blood smear and bone marrow studies were normal. These cases show that GS should be included in the differential diagnosis of intra-abdominal masses and extradural spinal cord tumors, even in the absence of leukemia. (Korean J Med 77:236-240, 2009)

데이터 중심의 국방 시뮬레이션 네트워크 미들웨어에 관한 연구

이규호 ( Kyu-ho Lee ),심준용 ( Jun-yong Shim ),위성혁 ( Soung-hyouk Wi ),김세환 ( Sae-hwan Kim ) 한국정보처리학회 2014 한국정보처리학회 학술대회논문집 Vol.21 No.2

국방 시뮬레이션 소프트웨어 개발 시 급변하는 요구사항과 반복적인 구현에 빠르게 대처하기 위해 플러그인 기반의 개발프레임워크가 사용되어왔다. 그러나 개발된 소프트웨어는 내부 컴포넌트의 재활 용성은 증대되었으나,수많은 노드가 연결되는 분산 시뮬레이션 환경에는 적합하지 못했다. 이에 기존의 개발된 데이터 모델인 NOM을 기반으로 객체 간 통신이 가능하고,분산 환경에서 노드의 확장이 유연한 통신 미들웨어인 «Comm+를 제안한다.