[영상취재 부문_제139회 이달의 방송기자상] 코로나19, 최전선의 기록 : 〈시사기획 창 ‘코로나19, 최전선의 기록〉 2020년 4월 11일 보도 KBS 최재혁, 정형철 기자

최재혁 (사)방송기자연합회 2020 방송기자 Vol.55 No.-

과학영재들의 협동적 문제 해결에서 새로운 아이디어 제안자로서 리더의 역할

최재혁 한국물리학회 2009 새물리 Vol.58 No.5

From the view of a leader, I studied the process of cooperative problem solving by scientifically-gifted students. I analyzed the problem-solving process and the way of deciding on a leader of 2 groups of 3 scientifically-gifted 8th grade ~ 9th grade students in an advanced physics course at a university science-gifted center. They had a 90-minute creative, problem-solving group activity. They needed two main novel ideas to solve the problem. Their activities were analyzed by the types of work, such as group or individual, the way of suggesting novel ideas, the process of deciding on the leader, and the problem-solving method. As a result of this study, the novel idea played a role in deciding on the leader, and the leader led the expert problem solving. The two groups suggested two main novel ideas in the same order. The first group began with novice problem solving, and the other group began with expert problem solving. For the first group, the novice problem solving caused the novel idea to be in competition with other ideas, and the novel idea played a role in deciding on the leader. For the second group, the leader was decided by the first novel idea, and the leader rejected another novel idea. 본 연구에서는 과학영재들의 협동적 문제 해결 과정을 리더의 관점에서 연구하였다. 이를 위해 대학부설 과학영재교육원 물리 심화반 3명(중2 ~ 중3)으로 구성된 2개 조의 문제 해결과정 90분을 작업의 형태, 새로운 아이디어의 제안 과정, 리더의 결정 과정 그리고, 문제 해결 방법으로 분석하였다. 연구 결과, 새로운 아이디어는 리더를 결정하는 역할을 하였고, 리더는 전문가 문제 해결을 유도하였다. 두 조 모두 문제 해결에 필요한 2가지 새로운 아이디어가 같은 순서로 제안되었다. 1조는 초보자 문제 해결로 시작했고, 2조는 전문가 문제 해결로 시작했다. 1조는 초보자 문제 해결에서 아이디어의 경쟁을 통해 새로운 아이디어 제안을 이끌었고, 새로운 아이디어를 제안한 학생이 리더가 되었다. 2조는 리더가 첫 번째 새로운 아이디어로 결정이 되었으며, 이 리더는 새로운 아이디어를 거부하였다.

Primary leiomyosarcoma of the chest wall in a child : a case report

최재혁,정찬욱,이미정 대한소아청소년과학회 2008 Clinical and Experimental Pediatrics (CEP) Vol.51 No.1

Leiomyosarcoma is an uncommon soft tissue sarcoma of mesenchymal cell origin, which shows smooth muscle differentiation. Leiomyosarcoma is seldom found in the pediatric population, and accounts for fewer than 2% of all soft tissue sarcomas. Leiomyosarcoma of the chest wall is extremely rare in children. We report here a case of an 8-year-old boy with a primary leiomyosarcoma that was incidentally found as a rib mass. The patient underwent a complete resection for a suspected osteochondroma diagnosed by a three-dimensional chest computed tomography examination. Pathological findings of the mass revealed intersecting fascicles of spindle cells showing cigar-shaped nuclei, inconspicuous nuclear pleomorphism and occasional mitotic figures in the background of a suspected osteochondroma of the rib. This report documents the first description of a leiomyosarcoma possibly arising in an osteochondroma of the rib in a child. (Korean J Pediatr 2008;51:98-101)

LonWorks를 이용한 분산 지능 제어를 위한 통신 모듈의 설계 및 구현

최재혁,이태오,Choi Jae-Huyk,Lee Tae-Oh 한국정보통신학회 2004 한국정보통신학회논문지 Vol.8 No.8

본 논문은 애쉴론(Echelon)사의 LonWorks 기술을 이용하여 분산 지능 제어를 위한 LonWorks 통신 모듈 설계 및 구현에 대하여 논한다. LonWorks 통신 모듈은 하드웨어와 펌웨어(firmware)로 나눌 수 있다. 첫 번째, 하드웨어는 센서가 부착된 마이크로컨트롤러 부분과 제어와 데이터 네트워크를 함께 운용할 수 있는 LonWorks 구성요소이다. 즉, 뉴런 칩(neuron chip), 마이크로컨트롤러, 트랜시버(transceiver), LONCard로 구성되어 있다. 두 번째, 운용 펌웨어는 노드빌더(NodeBuilder) 3.0 개발 툴을 이용한 뉴런 C이다. 제작 구현된 LonWorks 통신 모듈은 LTM-10A, Gizmo 4 I/O board, 병렬 I/O 인터페이스를 이용하여 사전 테스트하였다. 그리고 필드 테스트를 위하여 마이크로컨트롤러 부분은 하이퍼터미널(HyperTerminal)을 이용하여 테스트하였고, 데이터 네트워크의 통신 절차는 윈도우즈용 LonMaker 툴을 이용하여 짧은 메시지를 송$.$수신하여 확인하였다. 이로써 LON(Local Operating Network)은 지능 디바이스를 가진 분산형 제어 기술을 사용하여 대형 제어시스템을 소형화할 수 있다. In this paper, we describes the design and implementation of LonWorks communication module for distributed intelligent control using LonWorks technology of Echelon. LonWorks communication module can be divided hardware and firmware. First, hardwares is divided into microcontroller attaching sensors and LonWorks components for working together control network and data network. Hardwares are consisted of neuron chip, microcontroller, transceiver, LONCard. Second, operating firmware is realized with neuron C using NodeBulider 3.0 development tool. Produced and implemented LonWorks communication module is pretested using LTM-10A, Gizmo 4 I/O board, parallel I/O Interface. For field test, microcontroller module part is tested by HyperTerminal, communication procedure in data network is certified by transmitting and receiving short message using LonMaker for Windows tool. Herewith, LON technology is based on network communication technique using LonWorks.

TWIK-1/TASK-3 heterodimeric channels contribute to the neurotensin-mediated excitation of hippocampal dentate gyrus granule cells

최재혁,Oleg Yarishkin,김은주,배연주,김아정,김승찬,유강현,조장훈,황은미,박재용 생화학분자생물학회 2018 Experimental and molecular medicine Vol.50 No.-

Two-pore domain K+ (K2P) channels have been shown to modulate neuronal excitability. The physiological role of TWIK-1, the first identified K2P channel, in neuronal cells is largely unknown, and we reported previously that TWIK-1 contributes to the intrinsic excitability of dentate gyrus granule cells (DGGCs) in mice. In the present study, we investigated the coexpression of TWIK-1 and TASK-3, another K2P member, in DGGCs. Immunohistochemical staining data showed that TASK-3 proteins were highly localized in the proximal dendrites and soma of DGGCs, and this localization is similar to the expression pattern of TWIK-1. TWIK-1 was shown to associate with TASK-3 in DGGCs of mouse hippocampus and when both genes were overexpressed in COS-7 cells. shRNA-mediated gene silencing demonstrated that TWIK-1/TASK-3 heterodimeric channels displayed outwardly rectifying currents and contributed to the intrinsic excitability of DGGCs. Neurotensin–neurotensin receptor 1 (NT–NTSR1) signaling triggered the depolarization of DGGCs by inhibiting TWIK-1/TASK-3 heterodimeric channels, causing facilitated excitation of DGGCs. Taken together, our study clearly showed that TWIK-1/TASK-3 heterodimeric channels contribute to the intrinsic excitability of DGGCs and that their activities are regulated by NT–NTSR1 signaling.

동축류 에틸렌 확산화염내의 수소 첨가에 따른 매연입자 생성 특성에 관한 연구

최재혁,임대원 해양환경안전학회 2018 해양환경안전학회 학술발표대회 논문집 Vol.2018 No.11

한나라당 전당대회 취재기

최재혁 관훈클럽 2011 관훈저널 Vol.- No.120

Study on the Development of the Maneuvering Mathematical Model Considering the Large Angle Motion of Submarine

최재혁,이성욱,안진형 한국해양공학회 2023 韓國海洋工學會誌 Vol.37 No.3

Maneuverability is a crucial factor for the safety and success of submarine missions. This paper introduces a mathematical model that considers the large drift and angle of attack motions of submarines. Various computational fluid dynamics (CFD) simulations were performed to adapt Karasuno's fishery vessel maneuvering mathematical model to submarines. The study also presents the procedure for obtaining the physics-based hydrodynamic coefficients proposed by Karasuno through CFD calculations. Based on these coefficients, the reconstructed forces and moments were compared with those obtained from CFD and to the hydrodynamic derivatives expressed by a Taylor expansion. The study also discusses the mathematical maneuvering model that accounts for the large drift angles and angles of attack of submarines. The comparison results showed that the proposed maneuvering mathematical model based on modified Karasno’s model could cover a large range of motions, including horizontal motion and vertical motions. In particular, the results show that the physics-based mathematical maneuvering model can represent the forces and moments acting on the submarine hull during large drift and angle of attack motions. The proposed mathematical model based on the Karasuno model could obtain more accurate results than the Taylor third-order approximation-based mathematical model in estimating the hydrodynamic forces acting on submarines during large drift and angle of attack motions.

과학고등학교 자연계열 교사들의 장기근무에 대한 인식과 요구 분석 - 과학영재 교사 만족도 제고를 위하여

최재혁,김명환,정병훈 한국물리학회 2007 새물리 Vol.54 No.4

This study analyzed Science-high-school teachers$^\prime$ recognition and the demands of long-term work in the school and 152 physics, chemistry, biology, earth science, mathematics, and information-technology teachers, including principals and vice principals. The result showed that 60.8 \% of the teachers wanted more than a six-year work period. They thought that it took about three years to be come professional at the school. To improve the working satisfaction at the school, they demanded additional benefits promotions, extra pay, administrative and financial support for research and education, and training for developing professional skill, in that sequence. Their demands differed with area, position, and career, but did not differ much with work period and academic ability. 본 연구에서는 전국 과학 고등학교 교장 및 교감, 그리고 자연계열 교사 152명을 대상으로 장기근무에 대한 인식과 요구를 분석하였다. 분석 결과, 이들의 60.8 \%가 6년 이상의 장기근무를 원하는 것으로 나타났으며, 이들 대부분은 과학고 학생들 지도에 있어 필요한 전문성 신장에 최소 3년 이상이 걸릴 것이라 보았다. 장기 근무 만족도를 높이기 위한 요구는 승진의 가산점, 보수의 우대, 연구와 교육을 위한 행재정적 지원, 연수기회의 확대 순으로 나타났다. 이런 요구는 학교권역, 직급, 교육경력에 따라 다르며, 과학고 근무기간과 학력에 큰 영향을 받지 않았다.

Reduction Effect of CO2 and Runoff by Green Infrastructure Application - Case Study of the Chungbuk National University -

최재혁,박봉주 인간식물환경학회 2017 인간식물환경학회지 Vol.20 No.2

Green Infrastructure (GI) approach provides significant benefits to cities and communities. GI applications would provide multi-benefits such as the reduction in building energy demand, stormwater management, urban heat island reduction, habitat creation, etc. GI is nowadays considered as a multi-benefit best management practice (BMP) at diverse levels of government. The purpose of this study is to find out the positive effects of GI application, and Geographic Information System (GIS) is used for the accurate and efficient analysis. Two polygon data, ‘GreenRoof’ and ‘ParkingPlace’ are produced with a satellite imagery extracted from Google Earth Pro. These data are used to calculate total available spaces for green roof and permeable pavement in the campus of Chungbuk National University. After GI application in the campus, 13.2% of landcover is converted to green spaces and this change results in expanding the green network of Cheongju city. The result of this study shows that green roof application can absorb 4576.95 kg/yr of Carbon Dioxide and possibly reduce maximum 1,497,600L urban runoff. This study proves how GI is valuable for the city environment with quantitative analyses