멀티 모달 지도 대조 학습을 이용한 농작물 병해 진단 예측 방법

이현석,여도엽,함규성,오강한,Hyunseok Lee,Doyeob Yeo,Gyu-Sung Ham,Kanghan Oh 대한임베디드공학회 2023 대한임베디드공학회논문지 Vol.18 No.6

With the wide spread of smart farms and the advancements in IoT technology, it is easy to obtain additional data in addition to crop images. Consequently, deep learning-based crop disease diagnosis research utilizing multimodal data has become important. This study proposes a crop disease diagnosis method using multimodal supervised contrastive learning by expanding upon the multimodal self-supervised learning. RandAugment method was used to augment crop image and time series of environment data. These augmented data passed through encoder and projection head for each modality, yielding low-dimensional features. Subsequently, the proposed multimodal supervised contrastive loss helped features from the same class get closer while pushing apart those from different classes. Following this, the pretrained model was fine-tuned for crop disease diagnosis. The visualization of t-SNE result and comparative assessments of crop disease diagnosis performance substantiate that the proposed method has superior performance than multimodal self-supervised learning.

개인과 내면의 공동체: 이청준과 김현 문학론의 전개와 논리

이현석(Lee, Hyunseok) 한국현대문학회 2019 한국현대문학연구 Vol.0 No.59

이 연구에서는 개인과 사회의 대립 관계를 기초로 한 현실 이해가 이청준과 김현의 문학론에서 공유되는 기저 논리라는 점을 논의의 전제로 삼고 이러한 논리가 어떠한 변모과정을 거치는가 하는 점을 살피고 있다. 이청준은 1970년대 초중반 억압받는 개인의 문제에서 억압하는 체제의 문제로 논점을 이동시키면서 그것을 정식화하는 논리를 「지배와 해방」을 통해 제시하는바, 여기에서 작가의 문학 행위의 내적 기원 문제와 작가와 독자의 관계 정립을 통한 문학의 사회적 가치 문제를 논한다. 이를 통해 정초된 문학론은 그 이후 창작 활동에 반영되어 이전과 구분되는 그의 후기문학에서의 특징적 차이를 만들어내는 것으로 보이는데 그것은 지배-피지배 논리를 전도시켜 ‘자유의 질서’를 통한 의식 지배라는 특유한 문학 이념 제시로 이어진다. 반면 김현은 비평 초기 골드만의 구조적 상동성 개념을 수용하여, 각 시대의 지배적 문학양식은 그 시대의 지배계층이 담지한 이념과 그 시대의 초월성을 표상하는 종교와의 연관성을 드러낸다고 봄으로써 작품의 문학사적 의미를 구성해낸다. 이때 문제적 개인으로서의 작가가 가진 문학적 이념은 시대정신을 반영하는 것으로 파악되게 되는데 이는 결과적으로 지배체제를 문학사적인 관점에서 정당화하는 것으로 작용하게 된다. 그러나 1970년대 중반 『한국문학의 위상_에서 개인과 사회의 관계를 재정립하고 억압하는 사회를 반성, 비판하는 것으로 문학을 규정하게 되는바 이는 작가에서 독자로의 문학주체의 이동과 연관되어 있다. 문학사가의 통시적 관점에서 볼 때 작가와 작품이 시대를 규정하는 요소라면 비평가는 공시적 관점에서 독자의 위치를 전유함으로써 문학의 가치를 판단하고 의미를 규정하게 된다. 이러한 변화의 과정을 보면 이청준과 김현의 관점은 동일한 논리구조 위에 서 있지만 작가와 독자라는 상이한 관점을 통해 문학을 전유함으로써 논점을 달리하게 되며 전자가 지배-피지배의 논리를 재규정하는 방식을 취한 것이라면 후자는 독자의 해석이 가지는 비판적 역량을 가치화하는 방식을 택하게 되는 것으로 이해된다. On the basis of the premise that the understanding of reality based on confronting relations between individuals and the society was the base logic shared by the literary theory of Lee Cheong-jun and that of Kim Hyeon, this study set out to investigate the changing process of the logic. Lee moved his point from individual issues under suppression in the early and middle 1970s to the issue of the system to suppress them, providing the logic making it formal through Rule and Liberation. Here, the social value issues of literature were discussed based on the internal origin of the author"s literary acts and the relations established between the author and his readers. His literary theory established in the process was reflected in his following creative activities, creating the characteristic differences of his later literature from his previous literature. It leads to his unique literary idea of ruling consciousness through the "order of freedom" by reversing the ruler-the ruled logic. Kim, on the other hand, accepted Goldmann"s concept of structural homology in his early days of criticism and stated that the dominant literary style of each period had something to do with the ideology of the ruling class and the religion representing the transcendence of the period, organizing the meanings of works in the history of literature. In such a case, an author"s literary concept as a problematic individual is understood to reflect the spirit of the times, which works to justi fy the ruli ng system from the perspective of l i terary hi story. In hi s The Status of Korean Literature in the middle 1970s, however, Kim defined literature as something reflecting on and criticizing the society to establish its relations again with individuals and suppress them. This had something to do with the shift of the literary subject from authors to readers. Authors and their works are elements to define a period from a diachronic perspective in the history of literature, whereas critics claim the sole possession of readers" position from a synchronic perspective to judge the value of literature and define its meanings. In these changing processes, Lee and Kim shared the same logic structure for their perspectives. They, however, varied in logical points later as they adopted different perspectives of authors and readers to objectify literature. While the former was to reverse the ruler-the ruled logic of Lee, the latter was to review ruling itself again altogether.

블록 코딩 방식의 인터랙티브 교육 콘텐츠 저작 도구

이현석(Hyunseok Lee),김영섭(Youngsub Kim),김진범(Jinbeom Kim),유정훈(Junghoon Yu),한성재(Sungjae Han) 한국정보과학회 2022 한국정보과학회 학술발표논문집 Vol.2022 No.12

25 kV급 고출력 전자총 열관리를 위한 타겟 냉각 성능 설계

이현석(Hyunseok Lee),배석정(Sukjung Bae),허형석(Hyungseok Heo),송기백(Gibaek Song) 한국자동차공학회 2023 한국자동차공학회 학술대회 및 전시회 Vol.2023 No.11

A study was conducted to cool down targets of high-power electron guns in order for thermal management of a radiation generator for non-destructive testing. Insufficient thermal management can cause overheating of the target surface resulting in cracks while electron beams collide against. In this study, several models of target cooling block has been generated to ensure cooling performance. The models have different configurations of their coolant passages by means of guiding baffles. In the case of installing guiding baffles, the cooling effect is increased while the pressure drop is increased. The structure of coolant channel separated into inside and outside is more effective in terms of cooling performance than that separated into upper and lower layers. The former has relatively small coolant pressure drop than the latter.

선의 의무와 악의 권리 : 1970년대 사회적 상상력의 두 양상

이현석(Lee Hyunseok) 한국현대문학회 2014 한국현대문학연구 Vol.0 No.44

APA 기반 온라인 파라미터 추정을 통한 IPMSM 센서리스 제어 특성 개선 연구

이현석(HyunSeok Lee),박제석(Jesuk Park),주상훈(SangHoon Ju),이근호(GeunHo Lee) 한국자동차공학회 2022 한국자동차공학회 학술대회 및 전시회 Vol.2022 No.11

투명 박막 리튬이차전지를 위한 LiNiPO₄ 박막의 광학 및 전기화학적 특성

이현석 ( Hyunseok Lee ),( Narendra S Parmar ),김광범 ( Kwang-bum Kim ),최지원 ( Ji-won Choi ) 한국센서학회 2018 센서학회지 Vol.27 No.1

Transparent olivine LiNiPO4 thin films on sapphire substrates were fabricated by radio frequency (RF) magnetron sputtering. The Xray diffraction patterns show these thin films have the phase of LiNiPO₄ with an ordered olivine structure indexed to the orthorhombic Pmna space group. LiNiPO₄ thin films deposited on sapphire substrates exhibit transmittance of about 83 %. It was confirmed that the LiNiPO₄ thin film exhibits a high potential of 5 V-class.

수소전기상용차 냉각순환시스템용 고유량 제어 밸브 해석 설계

이현석(Hyunseok Lee),배석정(Sukjung Bae),허형석(Hyungseok Heo),박찬진(Chanjin Park) 한국자동차공학회 2023 한국자동차공학회 부문종합 학술대회 Vol.2023 No.5

As environmental and resource concerns escalate, eco-friendly vehicles have gained momentum in the global automobile market. Among them, fuel cell electric vehicles (FCEVs) are becoming increasingly popular due to their higher loading capacity, shorter charging times, and longer mileage compared to battery electric vehicles. However, increasing FCEV’s market competitiveness requires improving the efficiency of the cooling circulation system. In particular, in FCEV’s power electronics (PE) system, the coolant flow rate requires a very high discharge flow rate of more than 200 L/min, so the development of an electronic valve for flow control to manage this high flow rate is necessary. This study focuses on the computational fluid dynamics (CFD) flow analysis of valve designed to control high flow rates in electrical component cooling circulation system. Specifically, the flow resistance characteristics according to valve opening and flow conditions were analyzed. The results show that the design to minimize the interference area inside the valve can reduce the pressure drop somewhat. Furthermore, vertical flow path setting has been shown to be more effective than horizontal flow path setting. In addition to flow performance, design plans to expand the flow path diameter requires consideration from various perspectives. This research contributes to improving the efficiency of FCEVs and supports the market competitiveness of FCEVs as a promising eco-friendly alternative to traditional gasoline-powered vehicles

싸이의 영상 뮤직비디오 ‘강남스타일’ 에 드러난 키치(Kitsch)와 밈(Meme)에 대한 탐구

이현석(Hyunseok Lee) 한국콘텐츠학회 2013 한국콘텐츠학회논문지 Vol.13 No.11

싸이의 영상뮤직비디오 ‘강남스타일’은 지난 2012년 7월 15일 세계 최대 동영상 사이트인 유튜브 (YouTube)에 공개 된지 161일 만에 조회수 10억 건을 돌파하며, 전 세계 ‘강남스타일’ 열풍을 일으켰다. 싸이의 ‘강남스타일’이 이토록 짧은 시간에 세계적인 파급을 일으킨 이유는 무엇일까? 학계에서는 이러한 유례없는 세계적 문화 현상에 대해 다양한 분석과 함께 일부 언론에서는 ‘키치’와 ‘밈’ 이론을 언급하였지만, 그 구체적 검증에 대한 사례가 전무한 상태이다. 본 연구에서는 ‘강남스타일’에 대한 범지구적 대중의 수용에서는 키치를 중심으로 알아보았으며, ‘강남스타일’의 세계적 확산 과정에서는 문화복제이론인 ‘밈’을 통해 분석하였다. 이는 ‘강남스타일‘ 현상에 대해 문화의 모방과 전파의 관점에서 종합적이고, 심도 있는 분석을 하고자 두 이론을 차용하였으며, 이를 통해 사회문화 현상에 대한 해석적 방법을 제시할 수 있는 연구라 사료된다. 이를 위해, 문헌과 사례조사를 통해 키치와 밈을 고찰하고, 이를 바탕으로 분석 조건을 도출한 후 강남스타일에 드러난 세계 보편의 대중적 정서와 문화의 확산에 대한 요인에 대해 분석하고자 한다. This research attempts to analyse the ‘Gangnam style’ which has achieved worldwide recognition and became the first YouTube video to reach a billion views on December 2012, since it has released on 15th of July, 2012. Why ‘Gangnam style’ is so popular and how Cy’s music video has spread across the world remarkably in very short period of time? It is suggested that the ‘Gangsnam style’ phenomenon can be explained by ‘Kirtsch’ and ‘Meme’, however there is no pertinent analysis in an academic way. In this respect, this research is concerned with addressing the ‘Gangnam style’, global cultural phenomenon, by the Kitsch related to the acceptance of global audience and the Meme engaged with global diffusion of music video in a cultural view. Therefore, this research reviews a broad range of literatures and seeks characteristics of two theories, on the ground of this, ‘Gangnam style’ will be investigated to verify the reason caused cultural phenomenon.

전기자동차용 CNT 히터의 난방 성능 평가

이현석(Hyunseok Lee),배석정(Sukjung Bae),허형석(Hyungseok Heo),이호성(Hoseong Lee),이병호(Byongho Lee) 한국자동차공학회 2020 한국자동차공학회 학술대회 및 전시회 Vol.2020 No.11

One of the most important factors in an electric vehicle is the mileage it can drive on a single charge. Many studies are being conducted on the effects on electric vehicle-mile. When the electric cabin heater is operated in the winter season, power consumption increases and vehicle-mile is significantly reduced. Development of heaters with low power consumption and high heating efficiency is needed. In this study, the performance of conventional positive temperature constant(PTC) heater was compared to a heater with carbon nanotube(CNT) material. Cabin heater was installed in the performance assessment equipment and the performance assessment was performed by simulating the winter season driving environment. Compared to conventional PTC heater, heat capacity of the CNT heater was greater. Pressure drop of CNT heater was high compared to the conventional PTC heater, but the difference was relatively small. CNT heater improved the heat-up rate by 34.2% over the conventional PTC heater.