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향상된 초기화 구조를 이용한 측면주사소나 영상 초해상도 영상복원
이준엽,구본화,김완진,고한석,Lee, Junyeop,Ku, Bon-hwa,Kim, Wan-Jin,Ko, Hanseok 한국음향학회 2021 韓國音響學會誌 Vol.40 No.2
This paper deals with a super-resolution that improves the resolution of side scan sonar images using learning-based compressive sensing. Learning-based compressive sensing combined with deep learning and compressive sensing takes a structure of a feed-forward network and parameters are set automatically through learning. In particular, we propose a method that can effectively extract additional information required in the super-resolution process through various initialization methods. Representative experimental results show that the proposed method provides improved performance in terms of Peak Signal-to-Noise Ratio (PSNR) and Structure Similarity Index Measure (SSIM) than conventional methods.
이준엽 ( Junyeop Lee ),이주용 ( Joo Yong Lee ) 대한류마티스학회 2015 대한류마티스학회지 Vol.22 No.3
Hydroxychloroquine (HCQ) has been widely used for treatment of various rheumatic and dermatologic diseases. However, under a high cumulative dose, HCQ may cause retinal toxicity. In this review, we summarize the underlying mechanisms, prevalence, risk factors, clinical characteristics, screening tests, treatments, and prognosis of HCQ retinopathy. Because HCQ retinopathy is rarely reversible, screening tests to determine the retinal toxicity prior to its development are important. The American Academy of Ophthalmology screening protocols for early detection were updated in 2013. However, as a different clinical type is found in Asian patients, predominantly the pericentral type of photoreceptor damage, rather than the traditional parafoveal type, we propose a modified screening protocol for detection of HCQ retinopathy in Korean and other Asian patients. (J Rheum Dis 2015;22:140-145)
글로벌생산네트워크의 변화추세 분석 -사회망분석기법을 활용한 자동차 및 반도체 산업을 중심으로
이준엽 ( Junyeop Lee ),최원익 ( Wonik Choi ),박슬기 ( Seulki Park ) 사단법인 아시아문화학술원 2021 인문사회 21 Vol.12 No.2
본 논문은 한국의 주요 수출품목인 자동차와 반도체 산업을 대상으로 하여, 글로벌생산네트워크의 최근 변화 추이를 분석한다. 생산네트워크의 변화를 관찰하기 위해서는 사회망분석기법의 군집구조 및 중심성 분석을 활용한다. 특히 본 논문에서는 기존 연구의 광의품목 분류보다 세분화한 HS6단위의 상품분류를 이용하여 반도체 및 자동차 세부 품목 무역데이터를 기초데이터로 사용하였다. 주요분석결과와 시사점은 다음과 같다. 첫째, 자동차와 반도체 모두에서 글로벌생산네트워크의 군집구조가 약화되는 추세가 관찰된다. 둘째, 미국과 그 외 주요 국가간의 내향 및 외향중심성은 2019년 전후로 반대 방향으로의 변화가 관찰된다. 이는 미국의 보호무역으로 각국의 수출네트워크가 축소되는 영향 및 수입네트워크 확대의 노력이 동시에 작용한 결과라고 판단된다. 셋째, 글로벌생산네트워크에의 영향은 상대적으로 중국 및 반도체 품목에서 큰 변화가 나타난 것으로 관찰된다. This paper analyzes changing patterns of the global production network focusing on the automobile and semiconductor industries. The main methodologies are the community modularity and centrality analysis based on HS 6digit classification. The main findings are as follows. First, cohesion and centrality analysis reveals that the global production networks has been weakening in both automobile and semiconductor industries. Second, Indegree and outdegree centrality in U.S. and other major countries is observed to change in the opposite direction around 2019. This would be the results of the U.S. initiated trade policy and reponses in other countiries. Third, the impact on the production network is observed relatively large in China and semicomductor industries.
TiO<sub>2</sub>/GOD 혼합물 기반의 글루코스 바이오 센서의 제작과 표면 처리를 통한 감도개선
이준엽 ( Junyeop Lee ),정동건 ( Dong Geon Jung ),이재용 ( Jae Yong Lee ),김재건 ( Jae Keon Kim ),정대웅 ( Daewoong Jung ),공성호 ( Seong Ho Kong ) 한국센서학회 2018 센서학회지 Vol.27 No.3
In this paper, the TiO<sub>2</sub>/glucose oxidase (GOD) mixture has synthesized through simple and low-cost fabrication methods. The physical properties of the mixture were proved using an FT-IR/NIR spectrometer, an X-Ray diffractometer, and a Raman spectrometer. GOD maintained its bioactivity during all fabrication process. The current characteristics of the glucose biosensor were proportional to the glucose concentration and effective surface area of square pyramid on a silicon substrate. The maximum current change was measured in a pH 7.0 buffer solution. The simple and low-cost fabrication process and surface treatment can be used widely in previous research for improvements in effective surface area.
황화수소(H<sub>2</sub>S) 감지를 위한 아세트산 납이 침염된 폴리에스터(PET) 섬유 기반의 변색성 센서
이준엽 ( Junyeop Lee ),도남곤 ( Nam Gon Do ),정동혁 ( Dong Hyuk Jeong ),정동건 ( Dong Geon Jung ),안희경 ( Hee Kyung An ),공성호 ( Seong Ho Kong ),정대웅 ( Daewoong Jung ) 한국센서학회 2020 센서학회지 Vol.29 No.5
In this study, the colorimetric sensor, polyester (PET) fabric dyed with lead (II) acetate (Pb(C<sub>2</sub>H<sub>3</sub>O<sub>2</sub>)<sub>2</sub>), was fabricated and characterized for the detection of the hydrogen sulfide (H<sub>2</sub>S). The surface morphology of the fabric was determined using scanning electron microscope and energy-dispersive X-ray spectroscopy. The optical properties of the fabric were evaluated by measuring the variation in the blue value of an RGB sensor. The fabric showed a significant color change, high linearity (R<sup>2</sup>: 0.98256), and fast response time (< 1.0 s) when exposed to H<sub>2</sub>S. This is because the sensor is highly porous and permeable to the gas. The fabric can not only be used as a hydrogen sulfide sensor but also be used to detect and prevent H<sub>2</sub>S influx using sticky tape on pipelines.
한지한,이환성,이준엽,이수진,채한,HAN, Ji Han,LEE, Hwan Seong,LEE, Junyeop,LEE, Soo Jin,CHAE, Han 사상체질의학회 2019 사상체질의학회지 Vol.31 No.1
Introduction The purpose of this study was to review thirty years of studies on psychological characteristics of Sasang types to delineate generalizable psychological theories pertaining Sasang typology. Methods Research articles providing psychometric characteristics of each Sasang types were extracted from five database written in Korean and English. Demographic features of the participants, clinical methods for the Sasang type classification, and psychological characteristics of each Sasang types were reviewed and summarized. Results A total of 59 peer-reviewed research articles were found to be published from 1991 to 2018, and the So-Yang and So-Eum Sasang type showed distinctive and contrasting psychological features. The overlap between Eastern and Western psychology in Behavioral Activation and Inhibition System was highlighted as for personality studies, but the anxiety as a pathological factor was not found distinguishable between Sasang types. Discussion The present systematic review provided insight on psychological perspectives of Sasang typology, and would be useful for establishing unique construct of Korean Psychology.
현기순 ( Kisoon Hyun ),이준엽 ( Junyeop Lee ) 한국경제지리학회 2016 한국경제지리학회지 Vol.19 No.1
본 연구는 무역 자유화 추세에 따라 국가 간 농식품 무역 구조의 특성이 어떻게 변화하는가를 규명한 것이다. 이를 위해 2000-2014년 동안 HS 코드 기준 농식품 4개 품목의 45개국 간 수출액 통계를 이용하고 사회네트워크 분석 방법을 적용하여 교역 네트워크의 중심성 및 응집구조 등을 파악하였다. 분석결과 첫째, 지역 간 연계는 확대되고 있으나 여전히 역내 네트워크의 연결정도가 강하게 나타난다. 둘째, 경제통합 정도가 가장 높은 유럽국가들이 농식품 교역의 중심국가 위상을 차지한다. 셋째, 아시아 지역 농식품 교역에서 통합정도가 강화되는 품목은 채소 및 각종 가공식품이다. 이는 역내 경제통합이 유사한 문화권에서 비롯된 농식품 교역을 활성화시킬 것이라는 것을 유추하게 한다. 넷째, 한국이 RCEP과 TPP 등 메가 FTA에 참여할 경우 한국 농식품 교역의 네트워크 지위가 강화되며, 특히 가공식품의 경우 그 효과가 현저하게 나타난다. 이는 상이한 지역 간의 경제통합 환경을 반영하여 한국 농식품 교역의 공간정책을 수립하는 것이 무엇보다 필요함을 시사한다. This paper examines the characteristics of structural change in the international agro-food trade network with a global trend of the FTA diffusion. By focusing on the centralities and the community structure to identify the agro-food trade network, we use the social network analysis and the trade data contained of 07, 08, 20, and 21 at the 2-digit HS product level among 45 countries over the last 15 years. The main analytical results are as follows: 1) Not only has intra trade network intensified more than inter-regional trade, but also, there is no doubt that inter-regioanl trade by linking has steadily increased. 2) EU countires have the high indices of centrality, which have already been highly integrated. 3) Intraregional agro-food trade network for fresh vegetables and processed food sector in Asia is shown to be strongly integrated. This finding suggests that the processes of economic integration will help strengthen the trade network for agro-food in a culturally homogeneous region. 4) The case of Korea`s participation in the RCEP and TPP, Korea`s power in the agro-food network tends to be reinforced, especially in the processed food sector. Overall, there is a need for establishment of spatial strategies and policies across the different regions for Mega FTAs.
이산화탄소 감지를 위한 4.26 μm 필터용 poly-Si/SiO<sub>2</sub> 다층 박막 기반의 패브리 페로-필터
도남곤 ( Nam Gon Do ),이준엽 ( Junyeop Lee ),정동건 ( Dong Geon Jung ),공성호 ( Seong Ho Kong ),정대웅 ( Daewoong Jung ) 한국센서학회 2021 센서학회지 Vol.30 No.1
In this study, the relationship between the transmitted light intensity and full-width-at-half-maximum (FWHM) of a Fabry-Perot filter was investigated. The measured refractive indices and absorption coefficients of the fabricated thin films were applied to the Fabry-Perot filter via simulations using optical software. Although considerable research has been conducted on Fabry-Perot filters, this study focused on the usefulness of 4.26-μm infrared filtering in carbon dioxide detection. Optical analysis was performed considering the effects of the thickness, refractive indices, and number of thin films in a distributed Bragg reflector. Ultimately, a clear trade-off relationship was observed wherein the transmitted light intensity decreased as the number of multilayers increased; however, the FWHM was observed to be narrower.