온실 내 작물 생육환경 모니터링용 이동식 로봇 플랫폼 및 디지털 쉐도우 프레임워크 개발

전준혁,김성민 한국산학기술학회 2024 한국산학기술학회논문지 Vol.25 No.2

Research is actively underway to respond to climate change caused by global warming and to provide an optimized plant growth environment in greenhouses. The objectives of the study is to develop a mobile robot platform that monitors the environment, and to establish and to verify a digital shadow framework based on real-time 3D model simulation. The main body of the robot platform, equipped with a sensor module that can measure the growing environment of plants such as temperature, humidity, illuminance, and carbon dioxide, could be controlled by an Arduino-based controller and steered via an RF transceiver. In order to use the platform as a framework, it was built based on a commercial model that is about 1/4 scale of an actual working robot. The framework was developed using Simulink with the data communication established through ThingSpeak IoT server. As a result of verifying and analyzing the developed framework, it was possible to collect, analyze, and publish information of greenhouse environment and robot operation in real time by separated seven channels, and remotely to check the environment through a vision sensor. Simulink 3D model simulations were performed based on data from the IoT server, allowing the digital model to be controlled simultaneously with the physical model, with an average latency of 4 seconds, including minimum update time. In this study, we propose a basic study on the agricultural use of digital shadow technology, which can be developed into true digital twin technology through further researches.

Analysis of Papers Published in the Journal of Astronomy and Space Sciences from 1984 to 2018

전준혁,Yonggi Kim 한국우주과학회 2019 Journal of Astronomy and Space Sciences Vol.36 No.3

This paper presents at the characteristics of publications in the Journal of Astronomy and Space Sciences from 1984 to 2018. Since its first publication, a total of 1,113 papers (~35 volumes) have been published up to December 2018. While the space astronomy field has made up a large portion of the total number of papers, the number of annually published papers in this field is decreasing. In contrast, the number of papers in the space environment field has been showing an increasing trend since 2013, accounting for more than 30% of the annual publications. The participation rate of foreign researchers has been maintained at greater than 20% since 2012. Despite the decrease in the number of paper per year, there are positive developments including sustained foreign researcher participation at greater than 20% and improvements in the impact factor. We believe that JASS has the potential to enter the distinguished level of international academic journals following a well developed future road map.

의상고성(儀象考成) 항성황적경위도표(恒星黃赤經緯度表)에 실린 별들의 동정

전준혁,김동빈,이용삼 한국천문학회 2011 天文學會報 Vol.36 No.1

천문학 논총에 게재된 논문(1984-2021)의 분석

전준혁,박지원,김용기 한국천문학회 2022 天文學論叢 Vol.37 No.3

In this study, we collected articles published in the Publication of the Korean Astronomical Society (PKAS) from 1984 to 2021, and performed quantitative analyses of their various aspects. PKAS is the journal where authors can publish research papers in Korean as well as English. It seems to have an advantage of the better accessibility to all people than other astronomy journals in English only. From 1984 to 2000, the number of articles published in PKAS has been steadily increased. From 2000, the number of published articles showed a tendency to decrease slightly every year. After 2010, the number of articles in PKAS has shown a sharp decline until now. Interestingly, in this period it is found that the topics published articles became various, in particular, many articles concerning historical astronomy began to be published. PKAS was selected as an accredited journal in 2018. This is a very positive situation, and we think the future direction of PKAS is encouraging. Considering these circumstances, the PKAS is suggested to reflect ideas of "interdisciplinary fusion" and "diversity" in publishing articles in the journal for its promising future.

수소 취성 시험 평가를 위한 수소 방출 방지용 비수계 아연( Zn) 도금

전준혁,장종관 한국가스학회 2022 한국가스학회지 Vol.26 No.3

Zinc is emerging as a environment-friendly plating material to replace cadmium, which is harm- ful to the human body, to prevent hydrogen gas penetration or release from metal materials. Electroplating of Zn and Zn alloys, which is usually performed in an aqueous acidic atmosphere, has disadvantages such as low coulombic efficiency, corrosion, and hydrogen release, resulting in industrial use difficult. In this study, a deep-eutectic solvent was synthesized using choline chloride and ethylene glycol. Using this as a solvent, an electrolyte for Zn plating was prepared, and then zinc was plated on the STS 304 substrate. The surface microstructure and roughness were observed using SEM and AFM. The crystal structure of the elec- tro-plated film was analyzed using XRD. Finally, the preventing effects of hydrogen release through Zn-based deep-eutectic plating on the STS 305 substrate were compared with the uncoated substrate. 아연은 인체에 유해한 카드뮴을 대체하여 금속재료에 수소가스가 침투하거나 금속재료 내부로부터 수소가 누출되는 것을 방지하기 위한 친환경 코팅 재료로 주목받고 있다. 일반적으로 수성 및 산성 분위기에서 수행 되는 아연(Zn) 및 아연 합금의 전기도금은 낮은 쿨롱 효율, 부식 및 수소 누출과 같은 단점이 있어 산업적 이용이 어렵다. 본 연구에서는 염화콜린과 에틸렌글리콜을 이용하여 Deep-eutectic solvent를 합성하고 이를 용매로 사용하 여 아연 도금용 전해질을 제조하여 STS 304 기판 위에 전기 도금하였다. 주사전자현미경(SEM)과 원자힘현미 경(AFM)을 이용하여 표면 미세구조와 조도를 관찰하였다. X선회절분석(XRD)을 이용하여 도금 막의 결정구 조를 분석하였다. 마지막으로 수소를 주입한 STS 304 기판에 최적화된 Zn 도금액을 코팅한 시료의 수소 방출 방지 효과를 분석하였다.

『조선왕조실록』에 나타난 간의대의 기록들과 천문학적 연관성

전준혁,이민수,김상혁,이용삼,Jeon, Jun Hyeok,Lee, Min-Soo,Kim, Sang Hyuk,Lee, Yong Sam 한국천문학회 2014 天文學論叢 Vol.29 No.2

We report the results of our study for ascertaining whether Ganui-dae built in the Josen Dynasty actually performed an astronomical role or not. The Ganui-dae was the first astronomical structure built as a part of the state astronomical undertakings by King Se-Jong. Our analysis was based on the Annals of the Joseon Dynasty. At first we extracted the records regarding Ganui-dae from the Annals of the Joseon Dynasty and then classified them under six heads according to their astronomical meaning and historical significance. From this analysis we found that the Ganui-dae performed the actual astronomical role. In addition, the provisional offices and peoples mentioned in the records show the astronomical correlation. Generally, when taking into account the functional side of the records, the Ganui-dae was related with the observation. Therefore, the Ganui-dae was the space for the astronomical activity. In conclusion, the Ganui-dae was built for the purpose of the astronomical activity.

제지슬러지소각재 및 킬레이트제 활용 간접탄산화 방법을 통한 이산화탄소 저장 및 탄산칼슘 생성

전준혁,김명진,Jeon, Junhyeok,Kim, Myoung-Jin 한국자원리싸이클링학회 2019 資源 리싸이클링 Vol.28 No.3

In this study, we conducted experiments to store $CO_2$ and produce $CaCO_3$ through indirect carbonation using paper sludge ash (PSA) and three chelating reagents (fumarate, IDA and EDTA). Fumarate and IDA used as solvents could facilitate the indirect carbonation reaction to store more $CO_2$ than water. When 0.1 M fumarate and IDA were used, $CO_2$ storage was 63 and $89kg-CO_2/ton-PSA$, respectively, and $CaCO_3$ yield was 144 and $202kg-CaCO_3/ton-PSA$. For the case of EDTA, however, the carbonation was hardly progressed. As either the concentration or Ca-ligand stabilization constant of each chelating reagent increased, the calcium extraction efficiency from PSA increased. In addition, the carbonation efficiency was influenced by the Ca-ligand stabilization constant. As the Ca-ligand stabilization constant increased, more calcium could be extracted from the PSA. With the constant larger than that of $CaCO_3$ ($10^{8.35}$), however, the carbonation reaction was not proceeded.

Canine model of ischemic stroke with autologous thrombus in three dogs; Magnetic resonance imaging features and histopathological findings

전준혁,정해원,이희천,강병택,서정향,정동인 충북대학교 동물의학연구소 2014 Journal of Biomedical and Translational Research Vol.15 No.3

Ischemic stroke is the most common type of stroke in humans. The purpose of this study was to evaluate the di- agnostic value of magnetic resonance imaging (MRI) in a canine model of stroke. Ischemic stroke was induced by us- ing prepared autologous thrombus. The dogs were placed in lateral recumbency on the operation table and the cervical area of each dog was sterilized by using alcohol. After mak- ing a cervical incision, the common carotid artery and inter- nal carotid artery (a branch of the common carotid artery that supplies an anterior part of the brain) were exposed. A 200 µL injection of the autologous thrombus prepared 24 hr prior to surgery was delivered with a 20 gauge venous catheter through an internal carotid artery. After successful delivery of the autologous thrombus, the venous catheter was removed, and the cervical incision was sutured. Neuro- logic signs including generalized seizures, tetraparesis, and altered mental status, were observed in all 3 dogs after in- duction of ischemic stroke and the signs manifested immedi- ately after awakening from anesthesia. T1- and T2-weighted images and fluid-attenuated inversion recovery (FLAIR) images of the brain were acquired 1 day before and 1 day after surgery. On the day following ischemic stroke induc- tion, MRI revealed multifocal lesions in the cerebral cortex and subcortex such as T1 hypointensity, T2 hyperintensity, FLAIR hyperintensity, and diffusion-weighted hyperinten- sity in all 3 dogs. Upon postmortem examination, ischemic lesions were found to be consistent with the MRI findings and they were unstained with 2% triphenyltetrazolium chloride. Histologic features of the earliest neuronal changes such as cytoplasmic eosinophilia with pyknotic nuclei were identified. Neuropil spongiosis and perivascular cuffing were also prominently observed at the infarcted area. The present study demonstrated the features of MRI and histo- pathologic findings in canine ischemic stroke models.

Analysis of Articles Published in the Journal of the Korean Astronomical Society from 1968 to 2021

전준혁,김용기 한국천문학회 2022 Journal of The Korean Astronomical Society Vol.55 No.4

This study presents the characteristics of publications in the Journal of Korean Astronomy Society (JKAS) from 1968 to 2021. JKAS has published 763 research articles over the past 54 years. In addition, 376 proceedings were also published with research articles. There were slight increases and decreases in the number of articles published in JKAS in the 1990s and 2000s, and in 2015 there was the highest recorded number of articles published for a given year. Since then, the number of articles has tended to decrease each year, up to and including the most recent period (2020--2021), which includes the Coronavirus pandemic. However, since theory centered research is primarily conducted without being swayed by society and policies, and that the proportion of authors belonging to educational institutions, such as universities, is high, the future direction of JKAS is encouraging. There are also positive developments including sustained researchers affiliated with international institutions at greater than approximately 23%, as well as improvements in the impact factor. Therefore, it is important to not be deterred by the decreasing trends of the quantitative aspect, but to respond positively by determining a future roadmap.

비극을 다루는 영화의 공정한 시선에 대하여 -콜럼바인 고등학교 총격사건을 다룬 영화들을 중심으로-

전준혁 한국기초조형학회 2017 기초조형학연구 Vol.18 No.6

The purpose of this research is for scrutinizing auteur's approach and method towards cinema, which is a popular visual media, that deals with tragedy. The object of this research is three films that directly and indirectly deal with Columbine Highschool Massacre, which happened in April 20, 1999 in Colorado, USA. <Elephant>, <Bowling for Columbine>, which are based on the event, and <We Need to Talk About Kevin>, which depicts a large-scale massacre through gaze of attacker's mother. Main reason that I chose Columbine Highschool Massacre is that the incident is representative example of that kind of tragedy, as the incident still remains valid questions about truth of actual event and ethics of seeing around the tragedy. Also a wide range of relationship among the truth, narrative, and media about the event are stretched out in the wide spectra. Through analysis of three films, I made an in-depth interpretation about violent quality and distortion that are intricate problems of cinema when it faces with traumatic event, and examine how each film avoids the dilemma and recover the narrative of perpetrators, as well as victims. In <Elephant>, I examined the formal way in which a film can achieve fair gaze when it represents a tragic event. In <Bowling for Columbine>, I revealed the plot of the film that exposes the social-structural problems by unveiling the story behind the incident. Lastly in <We Need to Talk About Kevin>, I demonstrated how important to have equal attention to victims and perpetrators in understanding whole affair by instituting a comparison with <A Mother's Reckoning>, written by Sue Klebold who is mother of one of Columbine perpetrators. Furthermore, by referring writings of Serge Daney, Jacques Rivette, Susan Sontag and John Berger that had mentioned fairness of cinema in association with violence and pain, I tried to make a depth and clear view towards the subject of the research. 본 연구의 목적은 대중적인 시각매체인 영화 속에서 비극을 다루는 작가의 태도와 방법에 대해 고찰해보는 것이다. 연구대상은 1999년 4월 20일 미국 콜로라도 주에서 일어났던 콜럼바인 고등학교 총격사건을 직간접적으로 다루는 두 편의 영화인 <엘리펀트>와 <볼링 포 콜럼바인>, 그리고 가해자의 어머니의 시선으로 대량 학살 사건을 다루는 <케빈의 대하여>이다. 콜럼바인 고등학교 총격사건을 선택한 이유는 하나의 대표성을 가진 표본으로서 해당 사건은 여전히 진실과 윤리에 대한 유효한 질문들을 남기고 있고 사건 자체뿐만 아니라 그것을 바라보는 매체와 서사, 그리고 진실 간의 다양한 역학관계가 넓은 스펙트럼 안에서 펼쳐져 있기 때문이다. 본 연구자는 세 편의 영화를 분석하여 트라우마적인 사건을 다루는 시각적 재현방법이 필연적으로 부딪히게 되는 난제인, 폭력성과 왜곡에 대해 심도 있게 해석하고 각각의 영화가 어떤 방식으로 그것들을 피해가고 피해자뿐만 아니라 가해자들의 서사까지도 회복시키고 있는지 분석하였다. <엘리펀트>에서는 영화가 비극적 사건을 재현할 때 공정한 시선을 획득할 수 있는 영화 형식의 방법론을 이야기하고, <볼링 포 콜럼바인>에서는 사건 이면에 가려진 이야기를 드러냄으로써 사회구조적 문제를 폭로하는 영화의 서사구성에 대해 살펴보고, <케빈에 대하여>에서는 사건에 관계된 사람들을 향한 동등한 관심을 갖는 것이 사건 전체를 이해하는 데 중요한 단서라는 사실을 최근에 출간된 <나는 가해자의 엄마입니다>라는 책과 비교하면서 논증하였다. 더불어 세르주 다네, 자크 리베트, 수잔 손택, 존 버거의 글을 통해 기존의 영화 및 시각 매체 연구자가 폭력과 고통을 다루는 영화의 공정함에 대해 이야기한 예들을 본 연구의 대상에 적용시켜 선명하고 깊이 있는 분석을 시도하였다.