수학적 모델링 교수·학습에서 중학생들의 담화 분석

장현석 한국학교수학회 2020 韓國學校數學會論文集 Vol.23 No.1

이 연구는 수학적 모델링이 반영된 중학생 이차함수 교수·학습 과정에서 발생하는 의사소통을 분석 한 것이다. 의사소통의 심층 분석을 위해 Sfard(2008)의 담화 이론과 언어 분석 틀(장현석, 김명창, 이 봉주, 2019)을 적용하였다. 이차함수 개념을 학습하고 3개월이 지난 학생을 대상으로, 이차함수 수학적 모델링 교수·학습이 2019년 6월 둘째 주에(1차시) 실시되었다. 그 결과는 다음과 같다. 첫째, 학생 간 이차함수 이외의 선행 지식의 차이로 인해 의사소통-인지적 갈등이 발생하였다. 둘째, 의사소통 과정에 서 서로 다른 관점의 문제 해결을 통해 지식을 확장하였다. 이러한 결과는 학생이 이차함수 개념의 이 해를 기반으로 의사소통 과정에서 문제점을 명료히 드러내고 학생 간 협동을 촉진할 수 있었던 것으로 해석 가능하다. This research is an analysis of communication that occurs during the quadratic function teaching and learning process of middle school students, which reflects mathematical modeling. For an in-depth analysis of the communication, Sfard(2008)'s discourse theory and language analysis framework were applied. A quadratic function mathematical modeling teaching and learning were conducted for the week second (1 hour) in June 2019 for students who studied the concept of a quadratic function and who passed a specified period (3 months). The results are as follows. First, The commo-gnitive conflict occurred because of differences in prior knowledge other than quadratic function among students. Second, in the course of communication, knowledge was expanded through problem-solving from different perspectives. These results can be interpreted as allowing students to clearly reveal problems in the communication process based on their understanding of the concept of quadratic functions and to facilitate cooperation among students. of the concept of quadratic functions and to facilitate cooperation among students.

국내 거주 외국인들의 경찰에 대한 신뢰도 결정요인에 대한 연구

장현석 경찰대학 치안정책연구소 2020 치안정책연구 Vol.34 No.1

Even though the research on the confidence in the police has been done a lot domestically as well as internationally, research on the immigrated foreigner’s confidence in the Korean police is very limited. This research examines how the perception on the group position among foreigners gives influence on the confidence in the police. Based on Weitzer(2010)’s and Bardford and Jackson(2018)’s research, this study examined the influence of discriminated treatment perception as a indicator of group position perception on confidence in the police. Also, confidence in the law and permissive attitude on the weapon possession were included as independent variables in order to explain the confidence in the police. Total 1,086 foreigners from 9 different countries were joined in the survey. According to the analysis results, the perception on the group position (discriminated treatment perception) showed a significantly negative relationship with confidence in the police. Also, as confidence in the law was higher, as the permissive attitude on the weapon possession was lower, the confidence in the police significantly higher among foreigners. Based on the findings, police implications and limitation of the research were discussed. 경찰에 대한 신뢰도 연구는 국·내외에서 다양하게 진행되었다. 하지만, 다른 나라에서 우리나라로 이주한 외국인들의 한국 경찰에 대한 신뢰도를 설명하는 연구는 매우 제한적으로 진행되었다. 본 연구는 국내 거주 외국인들이 인식하는 외국인이라는 집단 지위 인식이 경찰에 대한 신뢰도에 어떠한 영향을 주는지 검증하였다. 이를 위하여 Weitzer(2010)와 Bradford and Jackson(2018)의 연구를 바탕으로 하여 한국에 체류 중인 외국인들의 집단지위 인식 요인인 차별경험인식이 경찰의 신뢰도에 어떠한 영향을 주는지 조사하였다. 또한 국내체류 외국인들의 법에 대한 신뢰가 경찰에 대한 신뢰도에 어떠한 영향을 주는지도 조사하였다. 아홉 개 국가에서 이주한 외국인 1,086명에 대한 설문조사 자료를 분석한 결과 다른 변수들을 통제하고서 집단지위인식 요인인 차별경험인식이 높을수록 경찰에 대한 신뢰도가 유의미하게 낮은 것을 확인하였다. 또한 법에 대한 신뢰도가 높을수록 그리고 무기 소지에 대한 허용도가 낮을수록 한국 경찰에 대한 신뢰도가 유의미하게 높은 것을 확인하였다. 연구결과를 바탕으로 정책적 제언과 연구의 한계점을 제시하였다.

광경화성 아크릴레이트 수지에 따른 임프린트 패턴형성에 관한 연구

장현석,박선희,송기국 한국고분자학회 2009 한국고분자학회 학술대회 연구논문 초록집 Vol.2009 No.10

일반시민의 경찰에 대한 신뢰도 연구 : 표현적 시각의 경찰신뢰도 설명을 중심으로

장현석 한국경찰연구학회 2013 한국경찰연구 Vol.12 No.2

본 연구는 일반시민들의 경찰에 대한 신뢰도를 설명하는 시각 중에서 표현적 시각의 경찰신뢰도 접근방식이 한국 사람들에게 잘 적용되는 지 알아보고자 하였다. 이를 위해 세계가치조사 (World Values Survey) 연구 2005년도 자료를 사용하여 1,189명으로부터 면접한 자료를 분석 하였다. 여러 가지 인구사회학적 변수와 사회인식에 대한 변수들을 독립변수로 삼아 로지스틱 회귀 분석을 실시하였다. 그 결과 민주주의정도가 높다고 생각하는 사람일수록, 정치적 성향이 보수적인 사람일수록, 개인의 인권이 존중되고 있다고 생각하는 사람일수록, 이웃 간의 신뢰가 높은 사람일수록, 그리고 개인의 삶에 대한 만족도가 높은 사람일수록 경찰에 대한 신뢰가 높다고 나왔다. 개인인권존중과 이웃 간의 신뢰가 경찰에 대한 신뢰도와 가장 큰 관계를 보이는 변수로 파악 되었다. 본 연구는 2차 자료 분석의 한계가 있으나 보다 대표성이 있는 전국을 대상으로 표본을 수집하여 표현적 시각의 경찰신뢰도를 검증한 연구로서 가치가 있다고 할 것이다.

사육 밀도와 개체 크기에 따른 북방전복(Haliotis discus hannai) 치패의 성장과 이동 특성

장현석,최미진,오영대,임한규 한국수산과학회 2023 한국수산과학회지 Vol.56 No.4

Behavior serves as an important indicator of the effects of environmental stressors on organisms. In this study, oneyear- old abalone Haliotis discus hannai (15.1±0.8 mm) were used and each 0.34 m2 tank was stocked with 100, 150, 200, 250, and 300 juvenile abalone. After 328 days, we found that the low stocking density treatment showed significantly higher growth, whereas the high stocking density treatment showed significantly lower growth. In addition, abalone showed a lower rate of movement, distance moved, and velocity at higher stocking densities, but only velocity differed significantly. In contrast, In the Supplied the feed tanks significant difference between the moving distance and velocity. When the two groups of different sizes were mixed in tank, the rate of movement, distance moned, and velocity showed significant differences between differently-sized indivisuals. Our study indicates that breeding abalone at high densities has a negative effect on their growth and survival, which is thought to primarily be caused by spatial competition, and secondarily by differences in body size, ultimately affecting growth and productivity.

악골에 발생한 Florid Osseous Dysplasia의 치험례

장현석 大韓顎顔面成形再建外科學會 1996 Maxillofacial Plastic Reconstructive Surgery Vol.18 No.3

This is case report of florid osseous dysplasia occurred in the entire maxilla and mandible of 47-year-old female. Florid osseous dysplasia is an expansile, exuberant asymptomatic form of benign fibro-osseous disease of the periodontal ligament, often associated with jaw cysts and to be though as an abnormal reaction of bone to irritation or stimulation. The treatment was performed with removal of the necrotic bone, bone curretage and hyperbaric oxygen therapy. The patient did not well postoperatively and has shown sign of persistant infection with pus discharge.

집중호우시 사방댐의 산림재해 방지 효과

장현석,이상희,이종윤,김태은,김재수 한국산림공학회 2008 산림공학기술 Vol.6 No.1

원기둥을 이용한 중학생의 공간기하 이해 능력 분석

장현석,홍정애,이봉주 한국수학교육학회 2020 수학교육 Vol.59 No.2

The purpose of this study is to analyze how well middle school students understand space geometrical concept related to a cylinder. To this end, we developed the test tool based on prior research and examined 433 middle school students in November and December, 2018. And in March 2019, we interviewed 4 students who showed some type of errors. The difference in the correct answer rate of the questions by the grade and gender was tested, and the error type was analyzed based on the student's responses to the questions to evaluate the spatial reasoning ability. The results of this study are as follows. First, the difference by graders was not statistically significant in the questions evaluating spatial visual ability. On the other hand, in the case of the two questions for evaluating spatial measurement ability and spatial reasoning ability, the difference in the correct answer rate between the 7th graders and 8th is not significant, but the difference between lower graders and 9th was significant. Second, there was no significant difference in the spatial geometric ability of all girls and boys participating in this study. Third, analyzing the student's error type for an item which assessed spatial reasoning ability, we found that there are various error types in relation to visual, manipulative, and reasoning errors.

Simultaneous Determination and Stability Test of Two Phthalic Anhydride Derivatives, Senkyunolide A and Z‐Ligustilide, in the Water Extract of Cnidium Rhizome from Different Geographical Regions and Species Using HPLC‐UVD Analysis

장현석,강교빈,유귀재,권은아,윤준원,강병철,홍인기,김승현,성상현,조현종,장영표,양희정 대한화학회 2018 Bulletin of the Korean Chemical Society Vol.39 No.6

Cnidium rhizome from Cnidium officinale Makino and Ligusticum chuanxiong Hort (Umbelliferae) is traditionally used to treat pain in East Asian countries. Senkyunolide A and Z?ligustilide are phthalic anhydride derivatives that are the bioactive components of cnidium rhizome and chemical markers of the two species; they are also susceptible to external stimuli. In this study, we developed a method to identify two chemical markers using high?performance liquid chromatography (HPLC) with an ultraviolet detector (UVD); the contents of senkyunolide A and Z?ligustilide in cnidium rhizome from different regions were quantified. The stabilities of the compounds were tested at two different temperatures over 12 months. An HPLC?UVD system was used to identify and quantify senkyunolide A and Z?ligustilide in 10 C. officinale samples and 6 L. chuanxiong samples from China and Korea. The long?term stability of the C. officinale samples in dark conditions at 4 and 25 °C was also tested. The calibration curves for the two chemical markers showed high linearity (R2 = 1.0000), the precision was high (relative standard deviation (RSD) <4.17%), and the recoveries were within the range of 95?105%. The contents were mostly independent of the geographical origin and species, and >10% of the compounds degraded after storage at 4 and 25 °C for 6 months. A method was developed to rapidly identify two chemical markers in cnidium rhizome with good linearity, precision, and accuracy using HPLC?UVD. These markers will be utilized for the quality control or evaluation of herbal preparations containing cnidium rhizome.

객차 내 입석 공간 구조 제안

장현석,최세중 한국철도학회 2021 한국철도학회 학술발표대회논문집 Vol.2021 No.6