고등학교 1학년 학생들의 인지수준과 과학의 물질 단원 내용수준 비교 분석 및 교사들의 인식

김성숙,박소영,정미현,류상미,강성주,박국태 韓國敎員大學校 敎育硏究院 2009 敎員敎育 Vol.25 No.4

The purpose of this study was to seek for improved teaching and learning methods by comparatively analyzing the cognitive level of 10th grade students and the content level of high school science textbooks's matter unit and examining the teacher's understanding of these issues. For this study, the cognitive level of 336 10th grade students from 4 areas were analyzed using SRT Ⅲ (Science Reasoning Task Ⅲ) and the content level of 10 scientific concepts selected from the matter unit of high school science textbooks were analyzed using CAT (Curriculum Analysis Taxonomy). How high school science teachers understood these issues was also examined. The result showed that 51% of the research subjects were the formal operational level, 30% of the transitional level, and 19% of the concrete operational level. The percentage of students of the formal operational level varied according to each school. The scientific concepts of the matter unit of the 6 high school science textbooks were mostly of the early formal operational level. However, the content level of the same scientific concept varied according to each textbook, since the level of each textbookordiexpdeining scientific concepts to students and the answers theyiexpected from students were different. Furthermore, high school science teachers considered the content level of the scientific concepts lower than the actual content level analyzed through teptsAT. Such d6 harmonyibetween the cognitive level of students and the content level of the scientific concepts and the wrong conceptt. Furtteachers of the content level of the scientific concepts effects the students' understanding of scientific concepts and teaching-learning methods. I Furder to solve the discordance between the level of students and scientific concepts and to increase the understanding of students of scientific concepts, teachers should develop the appropriate teaching and learning methods that considers the cognitive level of students and content level of scientific concepts, by analyzing the cognitive level of students and understand the content level of scientific concepts of science textbooks, prior to class. 이 연구는 고등학교 1학년 학생들의 인지수준과 고등학교 과학 물질 단원의 내용수준을 비교 분석하고, 이에 대한 공통과학 교사들의 인식을 알아봄으로써, 교수 학습 방법에 대한 시사점을 얻고자 하는 것이다. 연구를 위하여 4개 지역의 고등학교 1학년 학생 336명 을 대상으로 SRT Ⅲ(science reasoning task Ⅲ)를 사용하여 인지수준을 조사하였으며, 고등학교 과학 물질 단원에서 10개의 과학 개념을 추출하여 CAT (curriculum analysis taxonomy) 분석틀로 내용수준을 분석하였다. 그리고 이에 대한 공통과학 교사들의 인식을 조사하였다. 연구 결과에 의하면, 고등학교 1학년 학생들의 51%가 형식적 조작가 수준이었으나, 30%의 학생들과 19%의 학생들은 각각 과도기 수준과 구체적 조작기 수준이었으며, 형식적 조작기 수준의 학생 비율은 학교별로 차이가 있었다. 고등학교 6종 과학교파서에 제시된 물질 단원 과학 개념들의 내용수준은 대부분 초기 형식적 조작기 수준이었으니, 같은 과학 개념이라도 설명하는 수준과 학생들에게 요구하는 답변의 수준 차이로 인해 교과서별로 내용수준에 차이가 있었다. 그리고 과학교사들은 과학 개념의 내용수준을 CAT 분석틀로 분석된 실제의 내용수준에 비해서 낮게 인식하고 있었다. 이러한 학생들의 인지수준과 과학 개념의 내용수준의 불일치와 과학교사들의 과학 개념 내용수준에 대한 잘못된 인식이 학생들의 과학개념에 대한 이해도와 교수-학습에 영향을 미칠 것이다. 그러므로 학생들의 인지수준과 과학 개념 내용수준간의 불균형을 해소하고 과학 개념에 대한 학생들의 이해도를 높이기 위해서는 과학교사들이 학생들의 인지수준과 과학 개념의 내용수준을 사전에 파악하여, 학생들의 인지수준과 파학 개념의 내용수준을 고려하는 교수-학습 전략이 필요하다.

畓에서의 有效雨量에 關한 硏究

金成俊,朴承禹,張秉郁,權純國,鄭夏禹 서울大學校 農科大學 1986 서울대농학연구지 Vol.11 No.1

In this study, a daily water balance model for effective rainfall in paddy fields is descrived, and compares the results with field data. The model was used to simulate seasonal effective rainfall for ideal plots with different irrigation scheduling. The followings are a summary of this study results: 1. Effective rainfall during irrigation season of paddy fields in 1985 ranged from 172.3mm at 4cm ridge to 206.7mm at 6cm ridge. They were 63.1% and 75.7% of total precipitation during that span, respectively. The water balance model simulated that 60.5% and 69.5% precipitation may be considered to be effective rainfall. 2. Daily rainfall appears to be important to the ratios of effective rainfall to the total. 3. Measured and estimated effective rainfall had a high correlation. R=0.9805

Cd(Ⅱ) 폴라로그람의 異常波에 關한 硏究

崔七男,朴聖珪,丁梧鎭,문경국 조선대학교 기초과학연구소 1984 自然科學硏究 Vol.7 No.1

pH 6.0∼12.0 範圍에서 0.15M 타르타르 酸鹽支持溶液 속에서 Cd(Ⅱ) Polarogram을 25℃에서 二段還元波를 調査한 결과 pH8.2部分 까지는 限界電流 및 半波電位값이 一定하며 한편 같은 濃度의 窒酸鹽 支持溶液을 사용하였을 때에 比하여 一段還元波의 半波電位값은 0.03volt 陰의 電位값으로 移動하고, 限界電流 값은 21% 減少되었다. pH8.2 部分 以上부터 限界電流 값이 急激하게 增加하다가 pH8.9 以上부터는 다시 急激하게 減少하는 現象을 보여 주었다. 한편 pH8.2 以上부터는 半波電位가 pH11.0에서는 -1.37volt로 되었다. 可能한 電極反應을 假定하여, pH11.0에 이르기까지의 還元波移動의 原因을 檢討하였다. The second reduction waves of the polarogram of Cd(Ⅱ) in 0.15M sodium tartrate solution were investigated in the range of pH from 6.0 to 12.0 at 25 C. Up to pH 8.2, the limiting current and the half wave potential were found to be constant, and when compared with the nitrate solution equal to the concentration of sodium tartrate, the limiting current of the first reduction wave has been decrease 21% and the half wave potential of the first reduction wave shifted by -0.03 volt. The values of limiting current were sharply increased above pH 8.2, and maximum value was obtained at pH 9.8. The half wave potentials were gradually proceeded in negative direction with increasing pH and the half wave potential of -1.37 volt was obtained at the pH 11.0. Suggesting possible mechanisms of electrode reactions, the anomalous behavior of reduction waves of Cd(Ⅱ) in sodium tartrate solution up to pH 11.0 was discussed.

도심지역 이동통신의 전파특성 모델

장자영,노순국,박종천,김재섭,박성렬,박창균 조선대학교 동력자원연구소 1996 動力資源硏究所誌 Vol.18 No.1

To predict accurately an antenna radiation pattern is very important for determining of a service area, base-station location, cell design. In this paper, we have calculated a propagation prediction data of Hata, Egri, Carey, Free Space Loss model by a computer simulation in Kwang-ju downtown, and the data is compared with field test data. As a results, Hata and Egri model are approached to field test data, but considerable errors are detected.Conclusively, we believe that the most accurate prediction model must propose to improve the radio propagation environments for the specified region. For resolve these problems, we are proposed a mew experimental radio wave propagation predict model.

한국형 후각검사 KVSS Test의 개발

홍석찬,유영석,김은서,김석천,박수홍,김진국,강성호 대한이비인후과학회 1999 대한이비인후과학회지 두경부외과학 Vol.42 No.7

S-147 Baseline Renal Function Predict Hyponatremia in LC Patients Treated with Terlipressin

( Seong Hun Kang ),( Ji Won Park ),( Hyoung Su Kim ),( Ki Tae Suk ),( Myoung Kuk Jang ),( Sang Hoon Park ),( Myung Seok Lee ),( Dong Joon Kim ),( Choong Kee Park ),( Sung Eun Kim ) 대한내과학회 2016 대한내과학회 추계학술대회 Vol.2016 No.1

Objectives: Terlipressin is safely used for the management of acute variceal bleeding. However, side effects, such as hyponatremia, although very rare, can occur. We investigated the development of hyponatremia in cirrhotic patients who had acute variceal bleeding treated with terlipressin, and attempted to identify the risk factors associated with the development of hyponatremia. Material and Methods: This retrospective, case-control study investigated 88 cirrhotic patients who developed hyponatremia and 116 control subjects who did not develop hyponatremia and were matched in terms of age and gender during same period following terlipressin administration. Results: The overall change in serum sodium concentration and the mean lowest serum sodium concentration were 3.44±9.55 and 132.44±8.78 mEq/L during treatment, respectively. In 47 patients (53.5%), the serum sodium level decreased by 5-10 mEq/L; in 20 patients (22.7%), this level decreased by 10-15 mEq/L; and in 21 patients (23.8%), this level decreased by >15 mEq/L. Multivariate analysis revealed that baseline normal or near-normal serum sodium and creatinine levels were independent positive predictors of the development of hyponatremia. The presence of HBV, DM, and shock on admission were independent negative predictors of the development of hyponatremia (p<0.05). The strongest predictor of the development of hyponatremia after terlipressin treatment was the baseline serum creatinine level (odds ratio, 0.166; 95% confidence interval, 0.067-0.412; p<0.001). Conclusions: Hyponatremia after terlipressin treatment may be developed in cirrhotic patients with relatively preserved liver function and renal conditions. Physicians conduct vigilant monitoring to prevent the possible neurological complications associated with severe hyponatremia. Keywords: esophageal and gastric varices, hyponatremia, liver cirrhosis, renal function, terlipressin

HIT PV Module Performance Research for an Improvement of Long-term Reliability: A Review

Park, Hyeong Sik,Jeong, Jae-Seong,Park, Chang Kyun,Lim, Kyung Jin,Shin, Won Seok,Kim, Yong Jun,Kang, Jun Young,Kim, Young Kuk,Park, No Chang,Nam, Sang-Hun,Boo, Jin-Hyo,Yi, Junsin Korea Photovoltaic Society 2017 Current Photovoltaic Research Vol.5 No.2

We report finding ways to improve the long-term reliability of PV module including the heterostructure with the intrinsic thin layer (HIT) solar cell. We point out the stability of the products of Panasonic HIT cell. We account for a brief description of the module manufacturing process to investigate the issues of each process and analyze the causes. We carried out the silicon PV module of the glass to glass type under the damp heat test around 1000 hours. However, it degraded around 7% of PV module power after 300 hours exposure in comparison with the initial status (Initial: 12.7 Watt). We investigated possible cause and solutions for the module performance to develop the long-term reliability.

Radiofrequency Ablation Treatment for Renal Cell Carcinoma: Early Clinical Experience

Park, Seong-Hoon,Yoon, Seong Kuk,Cho, Jin Han,Oh, Jong Young,Nam, Kyung Jin,Kwon, Hee-Jin,Kim, Su-Yeon,Kang, Myong Jin,Choi, Sunseob,Sung, Gyung-Tak The Korean Radiological Society 2008 KOREAN JOURNAL OF RADIOLOGY Vol.9 No.4

<P><B>Objective</B></P><P>To evaluate the early clinical experience associated with radiofrequency (RF) ablation in patients with renal cell carcinoma (RCC).</P><P><B>Materials and Methods</B></P><P>The RF ablation treatment was performed on 17 tumors from 16 patients (mean age, 60.5 years; range, 43-73 years) with RCC. The treatment indications were localized, solid renal mass, comorbidities, high operation risk, and refusal to perform surgery. All tumors were treated by a percutaneous CT (n = 10), followed by an US-guided (n = 2), laparoscopy-assisted US (n = 2), and an open (n = 2) RF ablation. Furthermore, patients underwent a follow-up CT at one day, one week, one month, three and six months, and then every six months from the onset of treatment. We evaluated the technical success, technical effectiveness, ablation zone, benign periablation enhancement, irregular peripheral enhancement, and complications.</P><P><B>Results</B></P><P>All 17 exophytic tumors (mean size, 2.2 cm; range, 1.1-5.0 cm) were completely ablated. Technical success and effectiveness was achieved in all cases and the mean follow-up period was 23.8 months (range, 17-33 months). A local recurrence was not detected in any of the cases; however, five patients developed complications as a result of treatment, including hematuria (n = 2), mild thermal injury of the psoas muscle (n = 1), mild hydronephrosis (n = 1), and fistula formation (n = 1).</P><P><B>Conclusion</B></P><P>The RF ablation is an alternative treatment for exophytic RCCs and represents a promising treatment for some patients with small RCCs.</P>

부산지역 설사환자에서 분리한 MRSA 균주의 다양성 분석

최성화(Seong Hwa Choi),박은희(Eun Hee Park),박연경(Yon Koung Park),김정아(Joung A Kim),김남호(Nam Ho Kim),이영숙(Young Suk Lee),빈재훈(Jae Hun Bin),박호국(Ho Kuk Park) 한국생명과학회 2008 생명과학회지 Vol.18 No.8

부산 지역 5개 2차 종합병원 설사환자 변에서 유래한 메치실린 내성 황색포도상구균(MRSA)에 대한 연구 결과, 분리된 황색포도상구균 142주 중 총 49주(34.5%)가 MRSA인 것으로 확인되었으며, 황색포도상구균 중 MRSA 분리율이 '04, '05, '06년에 걸쳐 각각 30.0%, 32.7%, 46.7%인 것으로 나타나, 지속적으로 증가하고 있음을 알 수 있었다. MRSA 균주의 항균제 내성 양상은 75.5%가 10종 이상의 항균제에 내성을 나타내었으며, 특히 11종 항균제에 대한 다제 내성균이 가장 많은 것으로 확인되었다. MRSA주의 장독소 유전자 시험을 실시한 결과 51%가 장독소 유전자를 가지고 있지 않았고, 30.6%가 독소유전자 A를 가지고 있었으며 그 밖에 C (8.3%), B (4.1%) 순이었다. MRSA 총 49주에 대해 PFGE를 수행하여 dendrogram을 작성한 결과, 크게 7개의 그룹으로 구분되었으며, 부산지역전체에 뚜렷하게 동일한 균주의 유행은 확인 할 수 없었으나, 종합병원 내에 소규모의 MRSA 유행은 있을 것으로 사료 되었다. We investigated the molecular epidemiological characteristic of methicillin resistant Staphylococcus aureus (MRSA) strains isolated from stool samples in Busan from 2004 to 2006. Among 142 isolates of S. aureus, 49 isolates (34.5%) were confirmed as MRSA. With the antimicrobial susceptibility tests, 37 isolates (75.5%) showed multiple resistance to more than 10 antibiotics, but all isolates were sensitive to vancomycin. All of MRSA had enterotoxin A in 30.6%, B 4.1%, C 8.3%, D, C/G, A 2.0% and None 51%. PFGE of SmaⅠ-digested chromosomal DNA was performed on 49 sporadic MRSA isolates. Restriction fragment patterns consisted of 8 to 14 fragments ranged in size from 48.5 to 630.5 kbp. We could divided the isolates into 7 groups (Ⅰ~Ⅶ) by analyzing PFGE patterns. Group I subdivided as 2 subgroups and 17 (34.7%) strains belong to the group Ⅰ. Dendrogram of PFGE patterns showed that MRSA strains in Busan were heterogeneous but we could find out minor homogeneity in hospital.

HIT PV Module Performance Research for an Improvement of Long-term Reliability

Hyeong Sik Park,Jae-Seong Jeong,Chang Kyun Park,Kyung Jin Lim,Won Seok Shin,Yong Jun Kim,Jun Young Kang,Young Kuk Kim,No Chang Park,Sang-Hun Nam,Jin-Hyo Boo,Junsin Yi 한국태양광발전학회 2017 Current Photovoltaic Research Vol.5 No.2

We report finding ways to improve the long-term reliability of PV module including the heterostructure with the intrinsic thin layer (HIT) solar cell. We point out the stability of the products of Panasonic HIT cell. We account for a brief description of the module manufacturing process to investigate the issues of each process and analyze the causes. We carried out the silicon PV module of the glass to glass type under the damp heat test around 1000 hours. However, it degraded around 7% of PV module power after 300 hours exposure in comparison with the initial status (Initial: 12.7 Watt). We investigated possible cause and solutions for the module performance to develop the long-term reliability.