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Duct ANC System에서 부가음원 방향별 소음감소효과
이응석(Lee, Eung-Suk),이형석(Lee, Hyung-Seok) 한국소음진동공학회 2009 한국소음진동공학회 논문집 Vol.19 No.3
In this paper, we studied on an attenuation effect of automobile exhaust noise according to the direction of canceling speaker in ANC system. Automobile exhaust noise was recorded at 800 rpm, 3500 rpm and 5000 rpm of a diesel engine. Directions of canceling speaker can be set to $30^{\circ}$, $90^{\circ}$ and $150^{\circ}$ against the primary noise flow by acrylic ducts to be made for the experimentation. DSP board with TMS320C6416 chip of Texas Instrument Co. used to control the ANC system. The algorithm of this ANC system applied the Filtered-x-LMS algorithm that is modified to compensate for a property of DSP input signal and the secondary-path effect. As an experiment result, the direction of canceling speaker was proved to influence the reduction effect of noise. The $150^{\circ}$ duct in the attenuation effect of noise showed a better result than the $90^{\circ}$ or $30^{\circ}$ duct.
Two Sensors Method를 이용한 진원도 정밀측정 알고리즘 연구
이응석(Lee Eung Suk),이민기(Lee Min Ki) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
This study is for a roundness and runout error algorithm for a DD servo motor and Spindle. Rounness and run out error estimates machine parts. The reason, machine parts have a lot of circular parts, which they have a relationship with DD servo motor and spindle. Especially, runout error is very important. The runout has an effect of machining form and feed. The proposed method is compared with one sensor method and two sensors method. Also, most of roundness is calculated by least square method. To compare result, the one sensor method and the two sensors method is calculated almost identical. To suggest the two sensors method will be used for other geometrical measured data, such as sphere or cylinder for obtaining the exact sphericity or cylindricity.
녹내장에서 파장가변 빛간섭단층촬영을 이용한 황반부 신경절세포층의 진단력
이응석(Eung Suk Lee),장지호(Jee Ho Chang),박태관(Tae Kwan Park),온영훈(Young Hoon Ohn),박가희(Ka Hee Park) 대한안과학회 2016 대한안과학회지 Vol.57 No.6
목적: 녹내장 환자에서 파장가변 빛간섭단층촬영(DRI OCT-1, Topcon Co., Tokyo, Japan)을 이용하여 황반부 신경절세포복합체 (macular ganglion cell complex, mGCC)와 황반 신경절세포 및 내망상층(macular ganglion cell inner plexiform layer, mGCIPL)의 두께를 분석해 보고 두 방법의 진단력을 확인해 보고자 한다. 대상과 방법: 2014년 8월부터 2015년 7월까지 본원에 내원한 109명 109안을 대상으로 파장가변 빛간섭단층촬영을 이용하여 mGCC와 mGCIPL의 두께를 측정하여 정상군, 초기, 진행된 녹내장군 간의 차이를 확인해 보고, 각각의 진단력, 민감도, 특이도를 구하여 유두주위 망막신경섬유층(circumpapillary retinal nerve fiber layer, cpRNFL) 두께 분석 방법과 비교해 보았다. 결과: 초기와 진행된 녹내장에 대한 area under the curve를 비교해 보았을 때 mGCC는 0.78과 0.99 cpRNFL과 유의한 차이가 없었으나 mGCIPL은 0.70으로 cpRNFL과 초기 녹내장을 진단하는 경우 cpRNFL의 진단력과 유의한 차이를 나타내었고(p=0.018),녹내장 진단에 대한 민감도와 특이도는 mGCC가 0.95와 0.97, mGCIPL은 0.92와 0.97로 측정되었다. 결론: 두 가지 방법 모두 녹내장을 진단하는 데 있어 높은 민감도와 특이도를 지닌 진단 방법이나, mGCC의 두께 분석 방법이 녹내장의 초기 변화를 감지하는 데 보다 나은 진단력을 가지고 있는 것으로 생각된다. <대한안과학회지 2016;57(6):941-950> Purpose: To evaluate diagnostic ability of macular ganglion cell complex (mGCC), macular ganglion cell inner plexiform layer (mGCIPL) measurements in glaucoma using swept source deep range imaging optical coherence tomography (DRI OCT-1, Topcon Co., Tokyo, Japan). Methods: From August of 2014 to July of 2015, 109 eyes of 109 subjects were assessed for the average thickness and sectional thickness of both mGCC and mGCIPL to determine whether there exists any significant difference among advanced stage glaucoma group, early stage glaucoma group and normal group in Swept source OCT. Comparisons were also made between the above measurements and circumpapillary retinal nerve fiber layer (cpRNFL) thickness measurements in their diagnostic accuracy, sensitivity, and specificity. Results: The diagnostic ability of mGCC based-mean thickness value (area under the curve [AUC] = 0.78/ 0.99) in detecting early stage glaucoma group as well as advanced stage group was not significantly different from that of cpRNFL thickness measurement. However, there was a significant difference in thickness between mGCIPL (AUC = 0.70) and cpRNFL in early stage glaucoma groups (p = 0.018). The sensitivities and specificities of mGCC were 0.95/0.97, and those of mGCIPL were 0.92/0.97, respectively. Conclusions: The two swept source OCT based methods measuring retinal ganglion cell layer thickness appeared to have a good diagnostic accuracy, high sensitivity and specificity in detecting glaucomatous eyes. Nevertheless, of the two methods, mGCC thickness measurement was more efficient in detecting early glaucomatous changes. J Korean Ophthalmol Soc 2016;57(6):941-950
연구논문 : 생명과학 ; 프로페논 화합물의 배양 대식세포에서 NFκ-B활성화 억제를 통한 NO 및 TNF-α 생성억제
이응석 ( Eung Seok Lee ),주혜경 ( Hye Kyung Ju ),문태철 ( Tae Churl Moon ),이은경 ( Eun Kyung Lee ),장영동 ( Yurng Dong Jahng ),이승호 ( Sung Ho Lee ),손종근 ( Jong Keun Son ),백석환 ( Suk Hwan Baek ),장현욱 ( Hyeun Wook Chang 영남대학교 약품개발연구소 2004 영남대학교 약품개발연구소 연구업적집 Vol.14 No.-