• Nuclear Engineering and Technology
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• 제54권10호
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• pp.3703-3716
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• 2022

Target alignment technology is one of the most critical technologies in laser fusion experiments and is an important technology related to the success of laser fusion experiments. In this study, by combining the open-loop and closed-loop errors of the target alignment, the Kalman state observer is used to estimate the position of the target, which improves the observation precision of the target alignment. Then the optimized result is used to guide the alignment of the target. This method can greatly optimize the target alignment error and reduce uncertainty. With the improvement of the target alignment precision, it will greatly improve the reliability and repeatability of the experiments' results, thereby improving the success rate of the experiments.

• 한국과학교육학회지
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• 제9권1호
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• pp.75-89
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• 1989

Secondary schools in Korea have been faced with several critical problems with regard to science education. Among them one of the most fundamental problems is associated with laboratory-based science education. There fore as a part of research project for the improvement of science education in secondary schools, this study had its abjectives to inquire into the following areas related to laboratory experiment. ${\circ}$Survey and analysis of theoretical backgrounds for science teaching focused on laboratory experiments. ${\circ}$Status survey of experiment-based science teaching in high schools. ${\circ}$Development of model for improving experiment-based science teaching. In order to fulfill these objectives this study used methods of eiterature review, survey, and interviews. The major finding are as follows : ${\circ}$Some topic for laboratory experiments as oppeared in the textbooks are not appropriate in the light of sience curricular operations in high schools. ${\circ}$In some schools equipments and facilities of school laboratories are for from sufficiency. ${\circ}$Laboratory experiments are not financially supportel for ideal science teach in both middle schools and high schools. These are not on exhaustive list of findings from this study More finding and teaching model for improvement of science education are also described in this paper.

• 대한자원환경지질학회:학술대회논문집
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• 대한자원환경지질학회 2005년도 춘계 학술발표회 논문집
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• pp.174-174
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• 2005

• 대한지구과학교육학회지
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• 제13권1호
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• pp.53-63
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• 2020

본 연구는 2019년도에 적용 2년차를 맞이한 고등학교 과학과 공통과목인 통합과학과 과학탐구실험의 2차 년도 적용 현황을 분석하고 이를 토대로 향후 과학과 고등학교 교육과정 개발을 위한 제언을 도출하는 것을 목적으로 한다. 이를 위해 총244개의 과학중점고와 일반고를 대상으로 설문조사를 실시한 결과를 2018년도 1차 년도 조사결과와 양적으로 비교하였다. 또한 초점집단을 구성하는 9명의 과학교사들과 심층면담을 실시하여 2차 년도 적용현황에 대한 심층 답변을 논의하였다. 연구결과에 따르면, 1차 년도와 마찬가지로 적용 2년차에도 통합과학은 대부분 6~8단위로 운영하고 있었으며, 학급당 통합과학을 담당하는 교사는 3~4명이 대부분인 것으로 나타났다. 교사 초점집단 면담에서 현장교사들은 통합과학이 통합적 지도를 필요로 하며 학생의 흥미와 관심 유발에도 좋지만, 평가공정성 확보 등의 문제로 과정중심 평가 등을 구현하기는 어렵다고 주장하였다. 과학탐구실험의 경우 대부분 학기당 1단위로 2개 학기로 운영하고 있었으며, 가르치는 사람이 달라서 통합과학과 과학탐구실험을 거의 연계하지 않는 것으로 나타났다. 2019년도부터 과학탐구실험의 학교생활기록 기재 방식이 절대평가로 변경되어서 상대평가로 성적산출을 하지 않아도 되므로 학생들의 만족도나 수업의 흐름이 기대한 것보다 훨씬 좋고, 부담없이 가르칠 수 있다고 교사들은 말하였다. 연구결과를 토대로 과학과 공통과목인 통합과학과 과학탐구실험 교육과정 안착을 위한 지원방안, 차기 과학과 교육과정 개정에서 통합과학과 과학탐구실험 과목의 개선 방안 등을 제안하였다.

• 한국축산식품학회지
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• 제42권4호
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• pp.609-624
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• 2022

Tenebrio molitor larvae, as known as edible insects, has advantages of being rich in protein, and has been recognized as a suitable alternate protein source for broiler and pig feed. Moreover, given their ability to biodegrade polystyrene, a major pollutant, Tenebrio molitor larvae has been proposed as an innovative solution to environmental problems. In the present study, we investigated the toxicity of Tenebrio molitor larvae powder (TMlp) ingested with expanded-polystyrene (W/ eps) through in vitro and in vivo experiments. The objective of this study was to determine whether TMlp W/ eps can be applied as livestock alternative protein source. For in vitro experiments, cytotoxicity test was performed to investigate the effects of TMlp-extract on the viability of estrogen-dependent MCF-7 cells. The possibility of estrogen response was investigated in two groups: Expanded-polystyrene-fed (W/ eps) TMlp group and without expanded-polystyrene-fed (W/o eps) TMlp group. For in vivo experiments, The male Sprague-Dawley rats were divided based on the dosage of TMlp administered and oral administration was performed to every day for 5 weeks. A toxicological assessments were performed, which included clinical signs, food consumption, body and organ weights, hematology, serum chemistry, and hematoxylin and eosin staining of liver and kidney. There were no specific adverse effect of TMlp W/ eps-related findings under the experimental conditions of this study, but further studies on both sexes and animal species differences should be investigated. In conclusion, TMlp W/ eps was considered non-toxic and observed to be applicable as an alternative protein source for livestock feed.

• International Journal of Naval Architecture and Ocean Engineering
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• 제13권1호
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• pp.877-888
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• 2021

The water entry behaviors of projectiles with different cone-headed angles were studied numerically, experimentally and theoretically, mainly focusing on the hydrodynamic impact in the initial stage. Based on MMALE algorithm, it was proposed a formula of impact deceleration, which relied on the initial entry velocity and cone-headed angle. Meanwhile, in order to verify the validity of the simulation model, experiments using accelerometer and high-speed camera were carried out, and their results were in a good agreement with simulation results. Also, theoretical calculation results of cavity diameter were compared with experiments and simulation results. It was observed that the simulation method had a good reliability, which would make forecast on impact deceleration in an engineering project.

• 한국과학교육학회지
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• 제28권8호
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• pp.870-879
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• 2008

이 연구는 26종의 중학교 1, 2, 3학년 과학 교과서에서 '물질' 분야에 제시된 실험 활동에서 요구하고 있는 실험 수행 능력을 조사하고 분석하였다. 물질 분야에는 전체 7 단원에 걸쳐 총 359개의 실험이 제시되었다. 실험수행능력 분석틀에 따라 실험을 분석해 본 결과, 중학교 실험을 수행하기 위해서 다양한 실험수행능력이 필요하고, 학년별로 차이를 보였지만 전체적으로는 유사한 패턴을 가지고 있음이 조사되었다. 전학년에 걸쳐 결과 정리와 자료 해석 및 일반화 능력이 가장 많이 요구되고 대체 실험과 관련된 능력들은 상대적으로 빈도가 낮은 것으로 조사되었다. 3학년의 경우, 1, 2학년 실험과 비교하여 상대적으로, 실험 수행을 위한 세부적인 능력이 골고루 필요로 하는 실험이 많이 포함되어 있었다. 실험 상황 예측, 실험기구 설치, 측정기구사용, 오차원인 분석 능력은 2학년에게 상대적으로 많이 요구되는 것으로 조사되었다. 실험기구 설치 능력은 1, 2학년에서, 안전사고 위험 숙지 능력은 1, 3학년에서 상대적으로 많이 요구되는 능력으로 조사되었다.

• 공학교육연구
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• 제13권5호
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• pp.15-19
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• 2010

Upon request from the Tokushima Prefectural Senior High School of Science and Technology, two faculty staff members and eight students of The University of Tokushima visited the high school and set up a chemistry laboratory class for 59 students. Since the participating senior high school students were freshmen, four simple, safe and visual experiments were selected: 1) Water purification, 2) Surface modification, 3) Briggs-Rauscher reaction, and 4) Polymer synthesis and characterization. All experiments received a favorable reception as a follow-up questionnaire verified. Since the high school students enjoyed the experiments it is hoped that the results will strengthen the students' interest in chemistry. It was good opportunity for the observers; they recognized the difficulty of teaching students.

• 한국초등과학교육학회지:초등과학교육
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• 제29권4호
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• pp.515-525
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• 2010

The purpose of this study was to analyze of how the elementary school teachers lead their classes of a science laboratory instruction and an engineering laboratory instruction in a science subject class. For this study, science laboratory and engineering laboratory lessons were selected and for each science and engineering laboratory lesson, five elementary school teachers were video-recorded of their lessons. The science and engineering laboratory lessons were analyzed by utilizing processes of the science model and the engineering model based on Schauble et al. (1991). The results of these studies are as follows: In science laboratory instruction, some participants didn't distinguish the difference between the science laboratory goal and the engineering laboratory goal. All of participants used search and end strategy of engineering laboratory for science laboratory lesson. In engineering laboratory instruction, all of participants guided to students engineering laboratory goal and used inferences and search strategy of engineering laboratory. However they didn't use the trial and error strategy or redesign which can be an essential element in engineering and design process. Educational implications are discussed.

• Molecules and Cells
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• 제19권1호
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• pp.39-45
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• 2005

RPK118 is a sphingosine kinase-1-binding protein that has been implicated in sphingosine 1 phosphate-mediated signaling. It contains a PX (phox homology) domain and two pseudo-kinase domains, and co-localizes with sphingosine kinase-1 on early endosomes. In this study we identified a novel RPK118-binding protein, PRDX3 (peroxiredoxin-3), by yeast two-hybrid screening. The interaction between these proteins was confirmed by pull-down assays and co-immunoprecipitation experiments. Deletion studies showed that RPK118 interacted with PRDX3 through its pseudokinase domains, and with early endosomes through its PX domain. Double immunofluorescence experiments demonstrated that PRDX3 co-localized with RPK118 on early endosomes in COS7 cells. PRDX3 is a member of the antioxidant family of proteins synthesized in the cytoplasm and functioning in mitochondria. Our findings indicate that RPK118 is a PRDX3-binding protein that may be involved in transporting PRDX3 from the cytoplasm to its mitochondrial site of function or to other membrane structures via endosome trafficking.