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- 저자 : 이정민 ( Jeongmin Lee ) (검색결과 321 건)
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이정민,배민철,김영우,최승명,백성관,이형욱,Lee, Jeongmin,Bae, Mincheol,Kim, Yungwoo,Choi, Seongmyung,Baek, Sungkwan,Lee, Hyoungwook 한국교통대학교 융복합기술연구소 2017 융ㆍ복합기술연구소 논문집 Vol.7 No.1
In general, the shoe stretcher is utilized to stretching the leather of shoe upper in the longitudinal direction. In the capstone design class, we tried to make a shoe leather stretcher for the ball of foot. Since a natural cow leather was recovered in length according to relaxation time after stretched, it was difficult to predict the initial amount of set up of stretching. In this paper, tensile and relaxation experiments were conducted in order to predict the amount of initial stretching for appropriate tensile length. Apparatus of leather stretching was designed and strains of leather were measured according to relaxation times of 12, 18, 24 hours after stretching of 24 hours. It was revealed that the ratio of the final relaxed strain and the initial applied strain was about 0.404 with R-square of 0.990 for a shoe cow leather.
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부산 서독적십자병원 폐원과정을 통해 본 1950년대 한독관계
이정민 ( Lee¸ Jeongmin ) 수선사학회 2021 사림 Vol.- No.77
This study examined the process of closing the DRK(West German Red Cross) hospital in Busan with an emphasis on the illegal disposal of foreign currency in 1956 and the discussions about hospital closure from 1958 to 1959. DRK hospital was founded by mutual agreement with the West German government and the US government in support of the postwar restoration of South Korea, and the strategic interests of West Germany and the US were inevitably reflected in the closing process. When medical aid from the Swedish Red Cross Hospital and other countries ended, the United States' strategic needs for the West German Red Cross Hospital also declined. West Germany felt difficult to maintain a hospital with the growing financial burden of free medical treatment. The hospital had internal accidents continuously. The Rhee Syngman government was unable to express its position during the opening and closing of the DRK Hospital, but it played some role in the worsening financial situation and the closing of the hospital, because they made no effort to improve the situation.
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다양한 환경조건(NaClO<sub>2</sub> 농도, 상대습도, 온도, 시간)에 따른 이산화염소 기체의 발생량 변화
이정민,이남택,류지훈,Lee, Jeongmin,Lee, Nam-Teak,Ryu, Jee-Hoon 한국식품과학회 2019 한국식품과학회지 Vol.51 No.4
본 연구는 염산(hydrochloric acid; HCl)과 아염소산나트륨(sodium chlorite; $NaClO_2$)을 이용해 이산화염소 기체를 발생시키기 위한 최적조건을 확립하기 위해 수행되었다. 먼저 HCl (1 N)에 다양한 농도의 $NaClO_2$ ($50,000-500,000{\mu}g/mL$)를 반응시킨 결과, $100,000{\mu}g/mL$ 농도의 $NaClO_2$를 포함하는 이산화염소 용액으로부터 가장 고농도(695 mg/L)의 이산화염소 기체가 생성되었다. 이후 진행되는 실험은 이산화염소 용액(1 N HCl+$100,000{\mu}g/mL$ $NaClO_2$)을 사용하여 이산화염소 기체를 발생시켰다. 다음으로 상대습도(43, 85, 100%) 또는 온도(4, 12, $25^{\circ}C$)가 이산화염소 기체의 발생에 미치는 영향을 확인한 결과, 상대습도가 감소함에 따라 온도는 높아짐에 따라 이산화염소 기체 발생 농도도 높아짐을 확인하였다. 마지막으로 이산화염소 용액의 용량과 이산화염소 기체 생성량 사이의 관계식을 도출하였다. 본 연구의 결과는 향후 이산화염소 기체를 이용하여 식품 및 식품 접촉 표면을 살균하기 위한 프로그램을 개발하는데 있어서 유용한 정보를 제공할 것이다.
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돼지 위축성 비염 단위 백신 개발을 위한 재조합 파스튜렐라 독소 단백질의 면역원성 검정
이정민,Lee, Jeongmin 대한수의학회 2007 대한수의학회지 Vol.47 No.1
Pasteurella multocida Pasteurella multocida toxin (PMT) is a causal pathogenin atrophic rhinitis in pigs. To investigate the protective immunity and vaccination effect of recombinantPMT, the gene for PMT was isolated from the infective P. multocida D:4. The 2.3 kb XhoI/PstI fragment(PMT2.3) of PMT gene was expressed in E. coli BL21 (DE3) using the induced expression vector system.The recombinant protein of PMT2.3 having molecular weight of 84 kDa was purified by Ni-afinitycolumn chromatography. The PMT2.3 raised slightly less anti-PMT antibody titer than formalin-killedwhole cel, however, it showed more protective imunity against P. multocida D:4 infection in vaccinationand chalenge.
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PC 기판상에 스퍼터링된 투명전도 산화막의 레이저 식각 특성
이정민,권상직,조의식,Lee, Jeongmin,Kwon, Sang Jik,Cho, Eou Sik 한국전기전자재료학회 2014 전기전자재료학회논문지 Vol.27 No.3
As a method of simple patterning of transparent conductive oxide (TCO) films deposited on flexible substrates, laser direct etching was carried out on TCO films sputtered on polycarbonate (PC) substrates. As a result of different binding energies in TCO films, indium tin oxide (ITO) and indium gallium zinc oxide (IGZO) were more easily etched than zinc oxide with different $Nd:YVO_4$ laser beam conditions.
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무선 센서 네트워크를 이용한 농업 환경 모니터링 시스템 구현
이정민(Jeongmin Lee),한재준(Jaejun Han),이은애(Eunae Lee),이홍준(Hongjun Lee),김동식(Dong Sik Kim),정범진(Beom Jin Chung),손성용(Sung-Yong Son),구이란(Iran Koo),이형재(Hyung Jae Lee) 대한전자공학회 2015 대한전자공학회 학술대회 Vol.2015 No.11
In this paper, we developed a wireless sensor network system to monitor the temperature and humidity of the agriculture environment. In order to construct a low-cost and low-complexity system, a narrow-bandwidth communication based on 424MHz frequency band is considered while achieving reliable wireless links. The developed system is implemented in a farm for maesil, which is sort of plum. For a slope farm environment, the system can successfully gather the measured data.
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초해상화를 통한 산업 환경 내 작은 객체 탐지 성능 향상
이정민(Jeongmin Lee),김정호(Jungho Kim) 한국정보기술학회 2024 Proceedings of KIIT Conference Vol.2024 No.11
산업 현장에서의 자동화 및 안전성 강화를 위해 작은 객체 인식(Small Object Detection, SOD)은 필수적인 과제이다. 그러나 작은 객체들은 해상도와 특징 정보가 제한적이기 때문에 기존 객체 탐지 모델에서 성능이 저하되는 한계를 가지고 있다. 이에 따라 본 연구는 YOLOv8과 초해상화(Super-Resolution, SR) 기법을 결합하여 산업 환경 내 작은 객체 탐지 성능을 강화하는 방법을 제안한다. YOLOv8의 첨단 백본 네트워크와 다단계 피처 융합 구조를 활용하여 작은 객체 탐지 성능을 극대화하며, SR 기법을 통해 고해상도 특징을 추가하여 객체 인식의 정확도를 높인다. 실험 결과, 본 연구에서 제안하는 접근법은 다양한 크기와 복잡한 배경을 포함한 산업 환경에서 작은 객체의 인식 성능을 크게 향상시키는 것으로 확인되었다. 이러한 연구는 산업 현장에서의 실시간 객체 인식과 안전성 강화에 기여할 수 있을 것으로 기대된다. Small Object Detection (SOD) is essential for enhancing automation and safety in industrial environments. However, due to limited resolution and feature information, existing object detection models often underperform when detecting small objects. This study proposes a method that combines YOLOv8 and Super-Resolution (SR) techniques to enhance the performance of small object detection in industrial settings. By utilizing YOLOv8’s advanced backbone network and multi-scale feature fusion structure, this approach maximizes the detection capability for small objects. Additionally, SR techniques are employed to enhance high-resolution features, improving detection accuracy. Experimental results confirm that this approach significantly improves detection performance for small objects in industrial environments with various object sizes and complex backgrounds. This research is expected to contribute to real-time object detection and safety enhancement in industrial applications.
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이정민(Jeongmin Lee) 한국식품영양과학회 2006 한국식품영양과학회지 Vol.35 No.10
LP-BM5 murine leukemia retrovirus induces the excessive oxidative stress and immune dysfunction leading to B cell leukemia and murine AIDS with cytokine dysfunction. In the present study, the immune restoratory effect of antioxidant hormone dedydroepiandrosterone sulfate (DHEAS) was investigated in the primary splenocytes from LP-BM5 retrovirus-infected C57BL/6 mice. DHEAS significantly increased T and B cell response to mitogen and normalized the unbalanced production of Th1/Th2 type cytokines. In particular, both protein and mRNA expression of IL-4, IL-6, and TNF-α were down-regulated by DHEAS treatment, whereas IL-2 and IFN-γ level were increased. This result suggests that DHEAS directly or indirectly regulates the gene expression of Th1/Th2 type cytokines in transcription level. In addition, DHEAS treatment decreased the hepatic lipid peroxidation and preserved vitamin E level in liver cells. These results suggested that DHEAS could effectively prevent immune dysfunction by regulating cytokine secretion and preventing the oxidative stress in murine AIDS.
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