심장 청진음 분류를 위한 길이 적응형 네트워크

정주영(Jung-Ju Yeong),홍영택(Youngtaek Hong),장영걸(Yeonggul Jang),심학준(Hackjoon Shim),장혁재(Hyuk-Jae Chang) 대한전자공학회 2020 대한전자공학회 학술대회 Vol.2020 No.11

Phonocardiogram (PCG) is a basic diagnostic test for heart diseases. However, it is difficult to analyze PCG signals objectively and needs specialized skills. Deep neural network can provide expert-level diagnostic performance on PCG. We proposed a novel deep neural architecture to analyze PCG signal. The proposed model uses 1D CNN layers for temporal modeling of PCG signal over time. We also use MFCC method and 3cylce data split as input preprocessing. The proposed network shows better diagnostic performance compared with other methods.

Node.JS 기반의 고가용성 웹 어플리케이션 서버 시스템 구조 설계 및 구현

정주영(Jeong Ju-Yeong),김민규(Kim Min-Kyu),류병제(Ryu Byeong-Je),이익행(Lee Ic-Haeng),지호준(Ji Ho-Jun),정중화(Jung Jung-Hwa),고석주(Koh Seok-Joo) 한국정보기술학회 2017 Proceedings of KIIT Conference Vol.2017 No.12

적외선 열화상기법을 이용한 균열 깊이에 따른 온도특성에 관한 연구

정주영(Ju-Yeong Jung),윤혁진(Hyuk-Jin Yoon),조현우(Hyun-Woo Cho),양희승(Hui-Seung Yang) 한국산학기술학회 2018 한국산학기술학회논문지 Vol.19 No.3

구조물의 강도 저하를 유발하는 균열의 조기 탐지 및 보수는 인적, 사회적 손실을 예방할 수 있는 중요한 부분이다. 이 논문에서는 균열 탐지를 위하여 적외선 열화상 기법 중 광-적외선 열화상 기술을 이용하여 콘크리트 시편의 균열 깊이에 따른 온도 특성을 분석하였다. 시멘트 반죽을 이용하여 0, 10, 20, 40, 80 mm의 인공 균열이 있는 시편을 제작하였으며, 인공균열 부분은 깊이를 제외한 모든 부분을 같게 생성하였다. 실험은 시편의 온도 특성을 파악하기 위하여 열원을 통해 시편을 가열한 후 균열부의 최저 온도를 비교하였다. 시편의 균열 여부에 따라 시편 표면 온도 분포가 입사 에너지의 단일, 다중반사 때문에 다르게 변화한다는 것을 확인하였으며, 시편의 온도 분포가 정상상태에 다다를수록 균열 깊이에 따른 온도가 감소하는 경향이 뚜렷해지는 것을 확인할 수 있었다. 정규화된 온도 데이터를 통하여 이 실험에 사용된 시편은 10분 후 정상상태에 근접하였으며, 10분 이후의 온도 데이터를 선형 회기 분석한 선형 방정식 기울기의 표준편차는 0.0005, y 절편 표준편차는 0.0038이다. 이때 정규화된 온도데이터의 표준편차는 0.01 이하로 매우 정합하며 균열 깊이에 따라 온도가 선형적으로 감소하고 있다. 이러한 결과는 균열부의 다중 반사가 발생하는 면적과 밀접한 관계가 있는 것으로 판단되며, 다양한 시편을 통해 균열부 면적과 입사 에너지의 상관관계를 분석한다면 무작위성이 높은 빛의 난반사 거동 모사에도 적용할 수 있을 것이다. The thermal characteristics of concrete specimens were analyzed using cement paste specimens with artificial cracks. In order to understand the temperature characteristics of the specimen depending on the crack depth, the specimen was heated and the minimum temperatures of the specimens at which cracks appear were investigated according to the crack depth. It was confirmed that the surface temperature distribution of the specimen varies depending on whether the specimen is cracked or not, because of the single and multiple reflections of the incident energy. Furthermore, as the temperature distribution of the specimen reaches a steady state, the temperature data tends to decrease with the crack depth. Through the observation of the normalized temperatures, it was found that the temperature of the specimens obtained from this experiment reached a steady state after 10 minutes. At this time, the standard deviation of the normalized temperature is around 0.01 or less, and the temperature decreases linearly with increasing crack depth. This result is considered to be closely related to the area where multiple reflections occur in the cracked region. If the correlation between the crack region and the incident energy is analyzed for various specimens, it can be applied to the diffuse reflection of the light.

수중초음파와 광학영상의 하이브리드 시스템을 이용한 교각 수중부 원격점검 기법 연구

정주영(Ju-Yeong Jung),윤혁진(Hyuk-Jin Yoon),조현우(Hyun-Woo Cho) 한국산학기술학회 2017 한국산학기술학회논문지 Vol.18 No.5

본 논문은 수중 초음파 시스템을 교각 수중부의 손상 진단 및 점검에 적용하기 위한 기초 연구로써, 수중 초음파와 광학 영상의 하이브리드 시스템을 이용하여 교각의 수중부 점검 실험을 수행하였다. 수중 초음파 시스템을 이용하여 교각수중부 촬영 시 현장실험에 영향을 미치는 환경변수를 파악하기 위하여 촬영 방향이나 촬영 방법 등을 변화 시키면서 결과영상을 획득 하였다. 교각 주위의 탁도는 10 NTU이었고, 물살과 파고에 의하여 수중 초음파영상에 잡음이 발생하였으나, 이를 최소화 할 수 있는 최적의 촬영 방향과 방법을 제안하였다. 수중 초음파시스템을 이용하여 교각 수중부의 손상 의심부위를 선정하였고, 광학 영상시스템을 이용하여 손상상태를 확인할 수 있었다. 또한 수중 초음파영상과 광학 영상의 정량적인 분석을 위하여 도트게이지를 활용하는 방안을 제안하였다. 본 논문의 결과는 수중 초음파와 광학 영상의 하이브리드 시스템을 이용한 교각 수중부 점검 기법 연구로, 이와 관련된 기술개발을 위하여 기초자료로 활용할 수 있을 것이라 판단된다. This study applied SONAR(Sound Navigation And Ranging) to the inspection and evaluation of underwater structures. Anactual river bridge was chosen for inspection and evaluation. SONAR and an optical camera were operated together to analyze the underwater image of the bridge. SONAR images were obtained by various methods to remove the environmental variables from the field experiment, and it was confirmed that the reliability of detecting damaged areas on piers was decreased when using SONAR alone. The SONAR equipment and the optical camera can be used simultaneously to overcome the limitations of SONAR in inspecting underwater structures.These results can be used as basic data for the development of similar technologies for underwater structure inspection.

공정 산포에 대한 영향 최소화를 위한 고성능 SiC 전력반도체 설계 개발

정주영(Ju Young Jeong),최수아(Sua Choi),오정목(Jung Mok Oh),박초이(Cho I Park),박영은(Yeong Eun Park),신승아(Seungah Sin),윤효원(Hyowon Yoon),석오균(Ogyun Seok) 대한전기학회 2021 대한전기학회 학술대회 논문집 Vol.2021 No.7

동결분쇄에 따른 아로니아, 자몽, 서리태, 발아현미의 이화학적 특성

전형주 ( Hyeong-ju Jeon ),이일남 ( Il-nam Lee ),한예은 ( Ye-eun Han ),정호준 ( Ho-jun Jeong ),박하은 ( Ha-eun Park ),정주영 ( Ju-yeong Jung ),이진규 ( Jin-kyu Rhee ) 한국미생물생명공학회(구 한국산업미생물학회) 2017 한국미생물·생명공학회지 Vol.45 No.4

식품중의 영양성분을 잘 보존하고 섭취가 용이하며 소화가 잘 될 수 있는 가공방법의 최적화를 위하여 식품원료의 동결분쇄물과 일반분쇄물을 비교하였다. 단백질의 공급원으로 알려진 서리태는 동결분쇄한 것이 일반분쇄한 것에 비해 미세하나 에너지원으로서 영양성분 보존율(이하보존율)이 4.57% 높고, 미네랄은 큰 차이가 없었다. 특히, β-carotene의 경우, 동결분쇄가공분말에서 11.54% 높게 포함되어 있어 비타민 A의 전구물질인 공급에 유리함을 보였다. 아로니아의 총 안토시아닌은 동결분쇄가 453.49 mg으로 일반분쇄 158.98mg 보다 보존율이 높았다. 자몽에서 열에 약한 베타카로틴은 동결분쇄가 129.47%, 니아신은 439.39%로 동결분쇄가 보존율이 높았다. 발아현미는 동결분쇄에서 단백질, 탄수화물, 니아신이 107.74%, 103.87%, 156.52%로 각각 높았다. Protease에 의한 단백질 소화율은 일반분쇄에 비하여 아로니아가 120.5%, 서리태가 101.14%로 동결분쇄방법이 단백질 소화율이 높았다. 그러나, 자몽과 발아현미는 동결분쇄에서 94.06%와 93.14%로 소화율이 떨어졌다. We compared the ingredients present in freeze-dried ground food samples with those present in hot air-dried and ambient ground food samples to optimize processing conditions for preserving nutrients in and for improving the ingestion of different foods. The freeze-dried ground sample of black bean showed 4.57% higher retention rate than the ambient ground sample of black bean. Mineral content was also significantly different between these two samples. Moreover, the freeze-dried ground sample of black bean contained 11.54% higher content of β-carotene, a precursor of vitamin A, than the ambient ground sample of black bean. Total anthocyanin content was 453.49 mg in the freeze-dried ground sample of Aronia compared with 158.98 mg in the ambient ground sample of Aronia. Contents of β-carotene and niacin increased by 129.47% and 439.39%, respectively, in the freeze-dried ground sample of grapefruit. Retention rates of proteins, car-bohydrates, and niacin were 107.74%, 103.87%, and 156.52%, respectively, in the freeze-dried ground sample of germinated brown rice. Protein digestibility increased by 120.5% and 101.14% in the freeze-dried ground samples of Aronia and black bean, respectively, but did not increase in the freeze-dried ground samples of grapefruit and germinated brown rice.

알로에 베라 부정근 추출물을 함유하는 피부 개선용 화장료 조성물에 관한 연구

김동명(Dong-Myong Kim),정주영(Ju-Yeong Jung),이형곤(Hyung-Kon Lee),권용성(Yong-Seong Kwon),백진홍(Jin-Hong Baek),한인석(In-Suk Han) 한국생물공학회 2020 KSBB Journal Vol.35 No.3

The objective of this study was to investigate whether extracts of aloe vera adventitious root produced by plant tissue culture technology has better effects on anti-wrinkle effect and skin-brightening than aloe vera extracts by performing in vitro assays. Aloe vera adventitious root and aloe vera were extracted by either water or 70% ethanol. Among water extract of aloe vera, water extract of aloe vera adventitious root, ethanol extract of aloe vera (AVE) and ethanol extract aloe vera adventitious root (AVRE), nitric oxide production inhibitory activity was the highest at AVRE, with a value of 62.28%. Inhibitory activities of matrix metalloproteinase (MMP)-1 and MMP-3 syntheses were highest at AVRE (65.11 and 37.21%, respectively). When analyzing synthetic activity of type I procollagen which has an antiwrinkle effect, AVRE showed higher value by 379.43% than UV-irradiated control group. The anti-melanogenic activity which correlates skin-brightening effect was also the highest at AVRE (83.77%), although, inhibitory activity of tyrosinase was not shown. Moreover, the value of DPPH radical scavenging activity of AVRE was higher than that of AVE by more than 10 times. From these results, it was confirmed that aloe vera adventitious root has better effect on wrinkle prevention and skin-brightening than aloe vera.

심바이오디니움으로부터 추출된 유효성분을 함유하는 신규 SUN BLOCK 물질에 관한 연구

김동명(Dong-Myong Kim),정주영(Ju-Yeong Jung),이형곤(Hyung-Kon Lee),박상근(Sang-Keun Park),권용성(Yong-Sung Kwon),양승구(Seung-Koo Yang),한인석(In-Suk Han) 한국해양바이오학회 2020 한국해양바이오학회지 Vol.12 No.1

Symbiodinium is a dinoflagellate genus that coexists with coral reefs and is known to provide ultraviolet (UV) protection in nature through the synthesis of mycosporin-like amino acids (MAA). In order to develop a natural and ecofriendly sunblock for use in summer resorts, the possibility of using a Symbiodinium microbiome extract or an MAA was investigated. Two sunblocks, one containing 7% Symbiodinium extract and the other containing MAA were prepared to be tested on hairless mice and human skin. In this clinical study, the sun protection factor (SPF) and Protection factor of UV A (PFA) values of the sunblock containing either Symbiodinium extract or MAA were determined. The SPF values of the sunblock containing Symbiodinium extract and MAA were 10.43 and 10.83, respectively, and the PFA values were 3.42 and 3.39, respectively. Based on their PFA values of ≥2, the UV A protection can be graded as PA+ (low) for both the sunblocks. In addition, the UV-blocking extract of Symbiodinium has a low phototoxicity and cytotoxicity, reducing the possibility of a heavy feeling to the skin or a foreign-body sensation caused by residue build-up. The low toxicity feature of the major sunblock component will also prevent side effects, such as allergic reactions. Although Symbiodinium extract or MAA alone do not provide effective protection against UV irradiation, their protection capacity can be complemented by the addition of inorganic UV-protecting compounds.

식용 제비집으로부터 비극성 비드기술을 활용한 시알산의 분리정제방법에 관한 연구

김동명(Dong-Myong Kim),정주영(Ju-Yeong Jung),이형곤(Hyung-Kon Lee),권용성(Yong-Sung Kwon),백진홍(Jin-Hong Baek),한인석(In-Suk Han) 한국해양바이오학회 2020 한국해양바이오학회지 Vol.12 No.2

Sialic acid, which is contained in about 60-160 mg/kg in the edible bird’s nest(EBN), is known to facilitate in the proper formation of synapses and improve memory function. The objective of this study is to extract effectively the sialic acid from edible bird’s nest using affinity bead technology (ABT). After preparing the non-polar polymeric bead “KJM-278-28A” having a porous network structure, and then desorbed sialic acid was concentrated and dried. The analysis of the physicochemical properties of bead “KJM-278-28A” showed that the particle size was 400-700 μm, the moisture holding capacity was 67-70%, the surface area (BET) was 705-900 m²/g, and the average pore diameter 70-87 Å. The adsorption capacity of the bead “KJM-278-28A” for sialic acid was shown a strong physical force to bind sialic acid to the bead surface of 400 mg/L. In addition, as a result of analyzing the adsorption and desorption effects of sialic acid on water, ethanol, and 10% ethanol on the bead, it was confirmed that desorption effectively occurs from the beads when only ethanol is used. As a result of HPLC measurement of the separated sialic acid solution, a total of four sialic acid peaks of N-acetyl-neuraminic acid (Neu5Ac), α,β-anomer of Neu5Ac and N-glycoly-neuraminic acid were identified. Through these results, it was confirmed that it is possible to separate sialic acid from EBN extract with efficient and high yield when using ABT.