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고등학교 3학년 자연계열 학생들의 도함수의 활용 단원에서 발생하는 오개념과 오류 분석
전태환 ( Tae-hwan Jeon ),신준국 ( Joonkook Shin ) 충남대학교 교육연구소 2016 교육연구논총 Vol.37 No.4
본 연구의 목적은 고등학교 3학년 자연계열 학생들의 도함수의 활용단원에서의 개념이미지와 그에 따른 오개념 및 오류를 찾는데 있다. 이를 위해 2007년 개정 수학과 교육과정과 2009년 개정 수학과 교육과정에서 개념에 대한 차이점을 조사하였다. 23명의 학생을 대상으로 예비검사를 실시하여 본 검사지를 제작하고, 상위 10% 이내인 70명의 학생을 대상으로 본 검사를 실시하였다. 검사 결과 학생들은 어떠한 개념에 대한 정의와 정리를 잘 구분하지못하며 오직 미분법을 이용하여 함수를 해석하는데 익숙하다. 또 미분이 불가능한 함수에서 미분가능성을 따지지 않고 미분을 적용하려 하거나 이러한 함수의 그래프의 해석을 어려워한다는 점을 발견하였다. 이에 따라 교사는 이러한 점들을 잘 알고 학생들을 지도할 필요가 있다. The purpose of this study was to understand student misconceptions and concept errors with derivatives after the lesson `Derivative Application` for the 12th grade High School Natural Science track in Korea. To measure the differences in the concepts of the Revised 2007 Mathematics Curriculum and the Revised 2009 Mathematics Curriculum in Korea, students were surveyed. A questionnaire was designed after preliminary inspection of 23 students. 70 students who were ranked in the top 10% of their class participated in the test. Students were found to only be accustomed to interpreting the functions using differentials but they were poor at discriminating between definition and theorem. It was also found that some students were inclined to apply differentials without consideration of differentiability to functions. These same students also had difficulty interpreting the graphs of these functions. Teachers must consider these things when they teach students.
경사계와 GNSS 나침반을 이용한 3성분 자력 탐사자료의 측지 좌표계로의 변환 방법
전태환 ( Tae Hwan Jeon ),임형래 ( Hyoung Rea Rim ),박영수 ( Young Sue Park ),임무택 ( Mu Teak Lim ),신영홍 ( Young Hong Shin ) 한국지구물리·물리탐사학회 2013 지구물리와 물리탐사 Vol.16 No.2
이 연구는 탐사 중 흔들리는 측정기기의 기울어짐을 2축 경사계와 GNSS 나침반으로 보정하는 방법에 관한 연구이다. 3성분 자력탐사와 같이 벡터로 측정하는 경우에는 관측 장비의 이동, 기울어짐, 요동 등에 따라 기울어진 관측 좌표계 위에서 측정된다. 이 측정값들을 측지 좌표계 위의 값으로 바꾸기 위해서는 측정면의 회전각이 필요하다. 이 논문에서는 2축 경사계로 얻은 두 방향의 경사각과 GNSS 나침반으로 얻은 방위각을 이용하여 관측 좌표면의 경사를 얻은후, 이것을 회전 변환에 직접 쓰이는 성분각으로 변환할 수 있도록 유도하였다. 이 연구에서 개발한 2축 경사계와 GNSS나침반을 이용하여 측지 좌표계로 변환하는 방법을 이용하여 실제로 배 위에서 측정한 3성분 자력 탐사 값을 측지 좌표계로 변환하였다. This study proposes a method to correct inclination of instrument during exploration with a biaxial clinometers and GNSS compass. In 3-component magnetometry, measured vectors are ordinarily described in randomly inclined observation coordinate system due to movement, vibration, and shaking of instrument. Therefore, rotation angles of observation plane are needed to transform it into geodetic coordinate system. In this study, we measured inclination angles of observation plane by using 2-axis clinometer and GNSS compass, and derived proper parameters for rotational transform from them. We applied the conversion method to on-board 3-component magnetometry, and then transformed raw data into proper values on geodetic coordinate system.
고한석 ( Han Suk Ko ),전태환 ( Tae Hwan Jeon ),김병직 ( Byung Jik Kim ),임영 ( Young Lim ),서정국 ( Jung Guk Seo ),주석규 ( Suk Kyu Zoo ),김진환 ( Jin Hwan Kim ) 대한고관절학회 1993 Hip and Pelvis Vol.5 No.1
Acetabulum consisting of the hip joint is the most important weight bearing joint in the lower extremity. The principle of treatment for this fracture must be restored the hip function which require accurate anatomical reduction and firm internal fixation followed by early joint moton. But because of the difficulties in the evaluation <@k classification of the fracture and in the exposure & reduction, treatment of displaced acetabular fracture have been controvirsal. Recently many authors stressed that surgical operation is often required to achieve the accurate anatomical reduction of fractured acetabulum and reported its good results. Authors reviewed and analysed 24 patients with displaced acetabular fractures by surgical treatment who had displacement of minimum 3mm after skeletal traction, which were treated at Department of Orthopedic Surgery, Inje University, Seoul Paik Hospital from Jan. 1987 to Jan. 1992. The results were as follows: l. According to Letournels classification, the most common type was posterior wall fracture, the second was transverse with posterior wall fracture, and pelvic bone fracture was the most common associated injuries. 2. Surgical approaches were Kocher-Langenbeck in 14 cases, Ilioinguinal in 5 cases, Obsorne and Moore in each 2 cases, triradiate trochanteric 1 case. 3. The satisfactory result was achieved in each 17 cases of patients with congruent reduction clinically & radiologically and in 14 cases clinically and in 15 cases radiologically of the patients who underwent surgical treatment.
Charnley Low-Friction 인공고관절술후 비구컵의 후기해리(late loosening)와 마모
고한석 ( Han Suk Ko ),전태환 ( Tae Hwan Jeon ),김영룡 ( Young Yong Kim ),김병직 ( Byung Jik Kim ) 대한고관절학회 1993 Hip and Pelvis Vol.5 No.1
Since the use of the Charnley hip prothesis, the component loosening has been the most common causes of failure. Although the detailed mechanism of loosening is as yet unclear, mehanical factors including quality of fixation, stress transfer and micromotion and biologic factors such as tissue necrosis, healing and response to particulate debris have been under close scrutiny. The 18 patients who have admitted for revision at Seoul Paik Hospital from Sep. 1992 to Apr. 1993 by late loosening (more than ten years after postoperatively) of acetabular cup after being performed Charnley Low-Friction arthroplasty were studied about the radiographic analysis, correlation of the real and radiographic measurement of wear and microscopic examination of granuloma tissue. The results were as follows: 1. The mean age at revision was 57 years old and the average time to revision was 13 years. 2. Acetabular radiolucent line (more than 2mm) was found in all cases and 12 cases (67%) of them was involved all three zones and the most common site was a zone III(16 cases: 8996). Femoral radiolucent line was found in 16 cases (89%), 11 cases of them was definite loosening (more than 2mm) and the most common site was a zone 7 (9 cases: 60%). 3. The average wear of polyethylene cup measured from radiographs by Charnley and Cupic (1973) was 2.98mm and average wear rate was 0.23mm / year, the real wear by Wrobleski (1985) was 3.47mm and average wear rate was 0.27mm / year.
김병직 ( Ryung Jik Kim ),고한석 ( Han Suk Ko ),임영 ( Young Lim ),서정국 ( Jeong Gook Seo ),최재열 ( Jae Yul Choi ),김형수 ( Hyung Soo Kim ),전태환 ( Tae Hwan Jeon ),안응선 ( Eung Sun Ahn ) 대한고관절학회 1992 Hip and Pelvis Vol.4 No.1
Recently a number of patients have been reported with localized aggressive resorption of bone around the cemented femoral component of a total hip replacement. In the first report, Harris reported four cases such patients with tumor-like bone resorption after total hip replacement arthroplasty, and described this condition as a benign, non-inflammatory, adverse tissue reaction. The authors report one case of aggressive granulomatous lesion in 13 year old cemented total hip replacement arthroplasty.