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CaAl-monosulfate와 CaAl-ettringite를 이용한 인공비소폐수의 비소 제거 연구
심재호,김기백,최원호,박주양 대한상하수도학회 2012 상하수도학회지 Vol.26 No.1
The objective of this study is to remove arsenate from artificially contaminated wastewater using CaAl-ettringite and CaAl-monosulfate which were synthesized in laboratory. The study was carried on the basis of solidification/stabilization of waste using cement. Monosulfate and ettringite are constituents of cement paste. The CaAl-ettringite has a chemical formula of Ca6Al2O6(SO4)3․32H2O and has a needle like morphology. Whereas CaAl-monosulfate Ca4Al2O6(SO4)․12H2O has layered double hydroxide structure (LDH) in which the mainlayer consists of Ca and Al and S as interlayer. Ettringite and monosulfate were synthesized by reaction of tricalcium aluminate and gypsum and hydrating this mixture at elevated temperature. The synthesized mineral were characterized by PXRD and FESEM to ensure purity. It was found that concentrations of As(V) in contaminated water were reduced from initial concentration of 1.335 mmol/L to 0.054 mmol/L and 0.300 mmol/L by CaAl-monosulfate and CaAl-ettringite respectively. The post experimental results of PXRD and FESEM analysis indicate that arsenate removal was by ion exchange. 시멘트를 이용한 고형화/안정화의 여러 기작 중 시멘트 페이스트의 구성물인 monosulfate와 ettringite에 초점을 맞춰 이들을 각 각 합성하고인공비소폐수에서의 비소 제거 실험을 실시했다. 소성과 중탕 과정을 거쳐 Ca2+와 Al3+이 mainlayer를 이루고 있으며, SO42-가 interlayer에삽입되어 있는 CaAl-monosulfate와 Ca2+와 Al3+가 column형태의 구조로, SO42-가 channel형태로 구성되어 있는 CaAl-ettringite를 합성했다. 순수하게 합성된 시료로 1.335 mmol/L As(Ⅴ) 농도의 수용액을 각각 0.054 mmol/L As(Ⅴ)와 0.300 mmol/L As(Ⅴ)까지 감소시켰다. PXRD와FESEM을 이용하여 반응 전 후의 시료 결정 구조와 상 분석을 행함으로써 이온교환에 의해 인공비소폐수의 비소가 제거 된 것을 알 수 있었다.
식물 분류 개념에서 중학생들의 심리적 위계에 (位系) 따른 수업효과
심재호,정완호 韓國生物敎育學會 1996 생물교육 Vol.24 No.2
The purpose of this study is to investigate the psychological hierarchy structure of the botanical classification concepts in the middle school level and to testify the effective teaching order by comparing the teaching effects of the psychological hierarchy order with those of teaching order of the current text. To study this purpose, four key concepts(flowering plants and non-flowering plants, angiosperms and gymnosperms, monocotyledonae and dicotyledonae, reproduction in plants) were extracted from the tasks analysis. To evaluate the degree of concept achievement, a 12-item concept evaluation instrument was developed. To identify the students' psychological hierarchy, the developed test items were applied to 3 classes in the first year course in middle school. Ordering theory that was developed by Airasian and Bart was used to identify middle school students' psychological hierarchy. To test effects of the psychological hierarchy, samples of 185 students of 4 classes in the first year course in middle school were selected and psychological hierarchy order was treated to the experiment class during three-months. Nonequivalent control group pretest-posttest design was used in this study as an research design. Experimental group applied psychological hierarchy order and control group applied concept order described in the current text. The major results of v:his study are as follows: 1. The psychological hierarchy structure in the botanical classification concepts is : flowering plants and non-flowering plants→monocotyledonae and dicotyledonae→angiosperm and gymnosperms, reproduction in plants order. On the other hand, Concept order described in the current texts is flowering plants. reproduction in plants angiosperms→dicotyledonae→monocotyledonae→gymnosperm order, The concepts are presested in the current texts is mainly ordered from evolutionary low level plants to high level plants. But this study's results are ordered from easy classification concept to difficult classification concept based on the student's psychological hierarchy. 2. Teacher's concept sequencing is variable, Maybe they construct psychological hierarchy by their be lief and text's construction. 3. The mean score of experimental group applied psychological hierarchy order was significantly higher(p$lt;.05) than the control group in the concept achievement. The mean score of experimental group was significantly higher(p$lt;.05) than the control group in the subelements' achievement.
심재호,유정식,정재준,김주희,김기황 대한영상의학회 2011 Korean Journal of Radiology Vol.12 No.4
Objective: We wanted to identify the geographic differences in hepatic fibrosis and their associations with the atrophy-hypertrophy complex in patients with chronic viral hepatitis using the dual-contrast material-enhanced MRI (DC-MRI) with gadopentetate dimeglumine and ferucarbotran. Materials and Methods: Patients with chronic C (n = 22) and B-viral hepatitis (n = 35) were enrolled for determining the subjective grade of fibrosis (the extent and thickness of fibrotic reticulations) in the right lobe (RL), the caudate lobe (CL), the medial segment (MS) and the lateral segment (LS) of the liver, with using a 5-grade scale, on the gradient echo T2*-weighted images of DC-MRI. The fibrosis grades of different segments were compared using the Kruskal-Wallis test followed by post-hoc analysis to establish the segment-by-segment differences. The incidences of two pre-established morphologic signs of cirrhosis were also compared with each other between the two groups of patients. Results: There were significant intersegmental differences in fibrosis grades of the C-viral group (p = 0.005), and the CL showed lower fibrosis grades as compared with the grades of the RL and MS, whereas all lobes were similarly affected in the B-viral group (p = 0.221). The presence of a right posterior hepatic notch was significantly higher in the patients with intersegmental differences of fibrosis between the RL and the CL (19 out of 25, 76%) than those without such differences (6 out of 32, 19%) (p < 0.001). An expanded gallbladder fossa showed no significant relationship (p = 0.327) with the segmental difference of the fibrosis grades between the LS and the MS. Conclusion: The relative lack of fibrosis in the CL with more advanced fibrosis in the RL can be a distinguishing feature to differentiate chronic C-viral hepatitis from chronic B-viral hepatitis and this is closely related to the presence of a right posterior hepatic notch. Objective: We wanted to identify the geographic differences in hepatic fibrosis and their associations with the atrophy-hypertrophy complex in patients with chronic viral hepatitis using the dual-contrast material-enhanced MRI (DC-MRI) with gadopentetate dimeglumine and ferucarbotran. Materials and Methods: Patients with chronic C (n = 22) and B-viral hepatitis (n = 35) were enrolled for determining the subjective grade of fibrosis (the extent and thickness of fibrotic reticulations) in the right lobe (RL), the caudate lobe (CL), the medial segment (MS) and the lateral segment (LS) of the liver, with using a 5-grade scale, on the gradient echo T2*-weighted images of DC-MRI. The fibrosis grades of different segments were compared using the Kruskal-Wallis test followed by post-hoc analysis to establish the segment-by-segment differences. The incidences of two pre-established morphologic signs of cirrhosis were also compared with each other between the two groups of patients. Results: There were significant intersegmental differences in fibrosis grades of the C-viral group (p = 0.005), and the CL showed lower fibrosis grades as compared with the grades of the RL and MS, whereas all lobes were similarly affected in the B-viral group (p = 0.221). The presence of a right posterior hepatic notch was significantly higher in the patients with intersegmental differences of fibrosis between the RL and the CL (19 out of 25, 76%) than those without such differences (6 out of 32, 19%) (p < 0.001). An expanded gallbladder fossa showed no significant relationship (p = 0.327) with the segmental difference of the fibrosis grades between the LS and the MS. Conclusion: The relative lack of fibrosis in the CL with more advanced fibrosis in the RL can be a distinguishing feature to differentiate chronic C-viral hepatitis from chronic B-viral hepatitis and this is closely related to the presence of a right posterior hepatic notch.
$^{14}C$ - 법과 산소법에 의한 일차생산 비교연구
심재호,강성현 한국해양학회 1986 韓國海洋學會誌 Vol.21 No.2
Photometric Winkler titration provides high precision enough to use the oxygen method in moderately productive waters In short incubation (2-4hr), about $2{\mu\textrm{g}}C/\ell/h$ can be differentiated by the photometric titration. The oxygen and $^{14}C$ methods resulted in good agreement with each other in the diurnal primary production measurements. Despite small descrepancies the severe underestimation of $^{14}C-technique$ was not observed in short-term incubation. Size-fractionated production studies indicated the importance of nanoplanktonic production in the coastal water (62-88%). Bacterial respiration may lead to significant underestimation in estimating net photosynthesis in the oxygen method. In spite of some problems associated with the ecological application of antibiotics, it seems feasible to use Gentamycin in separating planktonic respiration from that of total community.
2009 개정 고등학교 융합과학의 실행에 대한 교사의 인식
심재호 한국교육과정평가원 2014 교육과정평가연구 Vol.17 No.1
This study aims to identify the teachers' perception of the implementation of high-school integrated science developed by 2009 revised science curriculum. For this, the survey of teachers and interviews are performed, which are centered around the necessity, clarity, complexity, quality and usefulness that affect the implementation of the curriculum. The result shows that teachers perceive integrated science was not made by the needs of teachers and students, but by the needs of some scientists. It also shows the teachers lack the clarity in how to teach the integrated science. They consider the integrated science include difficult concepts which ignore the recognition level of the students and concept hierarchy is weakened because of the emphasis on integration and advanced technology rather than the organization of the content. Accordingly, the teachers include the preceding concepts and connected concepts to facilitate the understanding of the students in integrated science teaching, which increases the number of the concepts to deal with. On the other hand, they are positive about the usefulness and the quality of the integrated science textbook. Compared to the 7th textbook, the content and material of the integrated science textbook are varied and more of the content motivates interests and curiosity. However, this result does not indicate that the usefulness and quality of the integrated science is higher. This study suggests that integrated science curriculum should be made with the consideration on the coherent connection of concepts. 본 연구는 2009 개정 과학과 교육과정에 따라 개발된 고등학교 융합과학 과목의 실행에 대한 현장 교사의 인식을 알아보는 데 목적이 있다. 이를 위해 교육과정의 실행에 영향을 미치는 내적요소인 필요성, 명료성, 복잡성, 질 및 유용성을 중심으로 교사 설문과 면담 조사를 수행하였다. 연구 결과 현장 교사들은 융합과학이 교사와 학생의 필요에 의해 만들어진 것이 아니라 일부 학자들의 필요에 의해 만들어 졌다고 인식하고 있었다. 융합과학을 교사들이 어떻게 가르칠 것인지를 이해하는 실행의 명료성 측면에서도 부정적인 것으로 나타났다. 융합과학이 내용의 체계보다 융합과 첨단 과학을 강조하다 보니 개념의 위계는 약화되고 학생들의 인지수준을 고려하지 않은 어려운 개념들이 포함된 것으로 보고 있었다. 이에 따라 과학 교사들이 융합과학을 가르칠 때 학생들의 이해를 돕기 위해 필요한 선행 개념과 연계 개념들을 포함시키게 되고 그 결과 가르칠 개념의 수가 증가할 수밖에 없다고 하였다. 융합과학 교과서의 질 및 유용성은 긍정적인 것으로 나타났다. 제7차 교과서에 비해 융합과학 교과서의 내용 및 자료가 보다 다양화되었으며 호기심과 흥미를 유발하는 내용이 많아졌다고 하였다. 하지만 이러한 응답 결과가 융합과학의 질 및 유용성이 더 높은 것을 의미하는 것은 아님을 알 수 있었다. 이상의 결과로부터 융합과학을 시도하면서도 실질적으로 개념의 증가를 가져오지 않고, 개념 연계와 위계의 약화로 인한 학습의 어려움을 가져오지 않도록 하는 것이 융합과학에서 해결해야 할 과제가 됨을 알 수 있다.
Localized Metastasis to Small and Large Bowel from Breast Cancer: A Case Report
심재호,손은주,임범진,육지현,김정아,정준 대한영상의학회 2010 대한영상의학회지 Vol.62 No.6
Breast cancer is one of the most common malignancies in women and the main leading cause of cancer death. Breast cancer frequently metastasizes to the bones, lungs, and liver; however, gastrointestinal involvement is rare. The most frequent sites of the GI tract involved are the stomach and the small intestine, while colonic metastasis is extremely rare with the presentation being nonspecific. Early diagnosis is important for proper treatment. We present a case of metastatic breast cancer to the small and large bowel.