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시간 분해 직렬 펨토초 결정학을 위한 3차원 프린팅 기반의 초고속 믹싱 및 인젝팅 시스템
지인서 ( Inseo Ji ),강전웅 ( Jeon-woong Kang ),김태영 ( Taeyung Kim ),강민서 ( Min Seo Kang ),권순범 ( Sun Beom Kwon ),홍지우 ( Jiwoo Hong ) 한국화학공학회 2022 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.60 No.2
Time-resolved serial femtosecond crystallography (TR-SFX) is a powerful technique for determining temporal variations in the structural properties of biomacromolecules on ultra-short time scales without causing structure damage by employing femtosecond X-ray laser pulses generated by an X-ray free electron laser (XFEL). The mixing rate of reactants and biomolecule samples, as well as the hit rate between crystal samples and x-ray pulses, are critical factors determining TR-SFX performance, such as accurate image acquisition and efficient sample consumption. We here develop two distinct sample delivery systems that enable ultra-fast mixing and on-demand droplet injecting via pneumatic application with a square pulse signal. The first strategy relies on inertial mixing, which is caused by the high-speed collision and subsequent coalescence of droplets ejected through a double nozzle, while the second relies on on-demand pneumatic jetting embedded with a 3D-printed micromixer. First, the colliding behaviors of the droplets ejected through the double nozzle, as well as the inertial mixing within the coalesced droplets, are investigated experimentally and numerically. The mixing performance of the pneumatic jetting system with an integrated micromixer is then evaluated by using similar approaches. The sample delivery system devised in this work is very valuable for three-dimensional biomolecular structure analysis, which is critical for elucidating the mechanisms by which certain proteins cause disease, as well as searching for antibody drugs and new drug candidates.
김현중(Hyun Joong Kim),지인배(In Bae Ji),서강철(Gang Cheol Seo),정세미(Se Mi Jeong) 한국농식품정책학회 2017 농업경영정책연구 Vol.44 No.2
This study proposes an improved raw milk price sliding system by introducing new pricing component, which is seasonal supply-demand difference factor, in addition to current pricing components, which are production cost and inflation adjustment factors. The improved raw milk sliding price system is designed to lower the raw milk price when raw milk is oversupplied while to raise it when raw milk is undersupplied. To calculate the adjusted price, we set up every criteria volume of milk powder stock, raw milk production, and fresh milk consumption using the data 2006-2015. As a result, the range of the supplydemand adjusted price was proposed from 106.02 to 169.10 won/ℓ. This accounts for about 11.4~18.3% of the most recent raw milk price of 922 won/ℓ. The range of seasonal differential pricing system is also proposed from 18.32 to 29.22 won/ℓ.
조재성(Jaesung Cho),서강철(Gangcheol Seo),지인배(Inbae Ji) 한국농식품정책학회 2019 농업경영정책연구 Vol.46 No.4
Since 2017, the Korean government has implemented the policy that restricts the production activity of selected duck farms in the nation and compensates for some of their economic loss due to the policy. This study analyzed the changes made in market equilibrium and social welfare due to the policy under various assumptions on the duck market situations. The results indicated that the policy reduced consumer, producer, and social surpluses by KRW 12 billion, 7.5 billion, and 19.5 billion, respectively. Also, social welfare will be significantly reduced if the policy is implemented during the period of AI outbreak. In this case, consumer, producer, and social surpluses decreased by KRW 21.8 billion, 15.2 billion, and 37 billion, respectively. Therefore, the policy should only be implemented in special circumstances and limit duck production at a minimum level.
조재성 ( Jaesung Cho ),서강철 ( Gangcheol Seo ),김현중 ( Hyunjoong Kim ),김원태 ( Wontae Kim ),지인배 ( Inbae Ji ) 한국농업정책학회 2018 농업경영정책연구 Vol.45 No.3
In Korea, the number of companion animals, especially dogs and cats, is rapidly increasing mainly due to the increase in the number of nuclear families and single-person households. Nevertheless, only one study has explored the future market size of pet related industries by applying compound annual growth rate to the market size in 2012. The objectives of this study are to update the information on the market size of pet related industries and to estimate the potential market size in the future using a bass diffusion model. The results of this study indicated that a total of 9.32~9.97 million dogs and cats was estimated to live in Korean households as pets in 2018. This number will increase to 11.55~16.49 million in 2027. The market size of pet related industries in Korea was estimated to 1,544 billion KRW in 2018 and 3,498 billion KRW in 2027.
고추 작물의 정밀 질병 진단을 위한 딥러닝 모델 통합 연구: YOLOv8, ResNet50, Faster R-CNN의 성능 분석
서지인(Ji-In Seo),심현(Hyun Sim) 한국전자통신학회 2024 한국전자통신학회 논문지 Vol.19 No.4
본 연구의 목적은 YOLOv8, ResNet50, Faster R-CNN 모델을 활용하여 고추 작물의 질병을 진단하고, 각 모델의 성능을 비교하는 것이다. 첫 번째 모델은 YOLOv8을 사용하여 질병을 진단하였고, 두 번째 모델은 ResNet50을 단독으로 사용하였다. 세 번째 모델은 YOLOv8과 ResNet50을 결합하여 질병을 진단하였으며, 네 번째 모델은 Faster R-CNN을 사용하여 질병을 진단하였다. 각 모델의 성능은 정확도, 정밀도, 재현율, F1-Score 지표로 평가된다. 연구 결과, YOLOv8과 ResNet50을 결합한 모델이 가장 높은 성능을 보였으며, YOLOv8 단독모델도 높은 성능을 나타냈다. The purpose of this study is to diagnose diseases in pepper crops using YOLOv8, ResNet50, and Faster R-CNN models and compare their performance. The first model utilizes YOLOv8 for disease diagnosis, the second model uses ResNet50 alone, the third model combines YOLOv8 and ResNet50, and the fourth model uses Faster R-CNN. The performance of each model was evaluated using metrics such as accuracy, precision, recall, and F1-Score. The results show that the combined YOLOv8 and ResNet50 model achieved the highest performance, while the YOLOv8 standalone model also demonstrated high performance.
디자인 학습윤리 교수법 및 융합 교육 콘텐츠프로그램 개발을 위한 질적 연구Ⅱ - 디자인 전공 학생을 중심으로 -
이지현(LEE, Ji Hyoun),오지현(Oh, Ji Hyun),김서현(Kim, Seo Hyeon),김지인(Kim, Ji In) 한국전시산업융합연구원 2021 한국과학예술융합학회 Vol.39 No.2
본 연구는 디자인 전공에서 이루어지고 있는 학습부정행위 현황 점검 및 문제점 파악에서 시작되었으며 연구의 목적은 근거이론을 통하여 디자인 전공에서의 학습부정행위 발생과 학습부정행위 판단의 어려움을 밝히고, 연구결과를 바탕으로 효과적인 디자인 학습윤리 교수법 및 교육 콘텐츠프로그램 개발 방안을 제시하는 것이다. 연구참여자는 디자인 전공 대학생이었으며, 연구자료는 포커스 그룹 인터뷰 방법을 사용하여 수집하였다. 자료 분석은 근거이론 방법을 적용하여 분석하여 연구참여자의 진술로부터 33개의 의미 있는 문장을 도출하여 14개의 주제로 구분하고 7개로 범주화하면서 스트라우스와 코빈이 제시한 패러다임 모형의 기본구성요소에 따라 디자인 전공 내에서의 학습부정행위와 학습윤리의 경험을 범주화하였다. 연구결과 및 내용은 다음과 같다. 첫째, ‘표절 및 저작권 침해’는 ‘디자인 전공에서 학습부정행위 발생’으로 나타났으며, 작용/상호작용 전략으로 ‘교수자의 명확한 가이드’, ‘교육 시스템의 개선’, ‘합당한 처리 경험’이 도출되었고, ‘디자인 전공에서 요구되는 학습윤리 교육의 적용’을 핵심범주로 결정하였다. 둘째, 이러한 연구결과를 바탕으로 ‘학습윤리 교육의 효과 기대’는 학생 교육 효과 및 학습문화 개선으로 교육자료로서의 표절 관련 가이드라인, 부정행위 목격 시 행동 가이드라인, 수업 과정에서 표절 여부를 검증·예방할 수 있는 수업 모형 및 보조 콘텐츠, 부정행위 발생 시 처리 지침의 개발이 필요함을 확인하였다. 디자인 전공 교수를 중심으로 진행한 선행연구와 함께 디자인 전공 대학생을 대상으로 진행된 본 연구가 디자인 전공의 특성을 반영한 학습윤리 교육내용 콘텐츠 개발에 기여할 수 있으리라 기대한다. This study began with checking the status of learning irregularities and identifying problems in the design major. The purpose of the study is to reveal the difficulties of learning irregularities and to develop effective design learning ethics teaching methods and educational contents programs based on the research results. The study participants were college students majoring in design, and the research materials were collected using focus group interview methods. The data analysis was analyzed by applying the rationale theory method to derive 33 meaningful sentences from the statements of the study participants, divided into 14 topics and categorized into seven, categorizing the experiences of learning fraud and learning ethics within the design major according to the underlying components of the paradigm model presented by Strauss and Corbin. The results and details of the research are as follows: First, plagiarism and pirate appeared to be “the occurrence of learning irregularities in the design major”, and “the clear guide of the professor”, “improvement of the education system”, and “reasonable processing experience” were derived as the key categories. Second, based on these findings, ’Expecting the effectiveness of learning ethics education’ confirmed that it is necessary to develop guidelines related to plagiarism as educational materials, behavior guidelines when witnessing cheating, class models and supportive contents to prevent plagiarism in class. It is hoped that this study, which was conducted on college students majoring in design along with a prior study centered on design professors, will contribute to the development of learning ethics education contents that reflect the characteristics of design majors.