화학문제의 요구주의력과 학습자의 기능적 정신용량과의 관계

崔秉舜,金都旭 한국교원대학교 과학교육연구소 1998 청람과학교육연구논총 Vol.8 No.1

이 연구에서는 100명의 인문계 고등학생을 대상으로 화학양론과 관련된 문제의 해결에서, 과제의 요구주의력 결정 방법과 학습자의 덩이지식화 정도가 화학문제의 요구주의력과 학습자의 기능적 정신용량과의 관계에 미치는 영향을 분석하였다. 연구결과에 의하면, 과제에 포함된 조작스키머 종류의 수를 그 과제의 요구주의력으로 보는 것이 가장 타당함을 알 수 있었다. 또한, 학습자의 덩이지식화 정도가 과제의 요구주의력과 학습자의 기능적 정신용량과의 관계에 영향을 미치는 중요한 변인이며, Pascual-Leone의 이론으로부터 가정할 수 있는 임계상황이 나타나지 않는 중요한 이유임을 알 수 있었다. The puprpose of this study was to investigate the influence of the way determining mental demand of the problem and the extent of chunking of the learner on the relations between the mental demand of the problem and mental capacity of the students in solving chemical stoichiometry problems of 11th grade students. It was found that the number of types of operative scheme included in the problem was considered the mental demand of the problem. It was also found that the extent of chunking of the learner was one of the important factors influencing on the relations between the mental demand of the problem and mental capacity of the students in solving chemical stoichiometry problems.

연령과 골소주 특성의 골량에 대한 연관관계

최동훈,송영한,윤영남,이완,이병도 대한구강악안면방사선학회 2006 Imaging Science in Dentistry Vol.36 No.2

Purpose : Bony strength is dependent on bone mass and bony structure. So this study was designed to investigate the relationship between the bone mass and bony trabecular characteristics. Subjects and Methods : Study subjects were 51 females (average age 68.6 years) and 20 males (average age 66.4 years). Bone mineral density (BMD, grams/cm²) of proximal femur was measured by a dual energy X-ray absorptiometry (DEXA). Regions of interest (ROIs) were selected from the digitized radiographs of proximal femur. A customized computer program processed morphologic operations (MO) of ROIs. 44 skeletal variables of MO were calculated from ROIs on the Ward’s triangle and greater trochanter of femur. WHO BMD classes were predicted by MO variables of the same ROI. Classification and Regression Tree analysis was used for calculating weighted kappa values, sensitivity and specificity of MO. Results : The discriminating factors of morphologic operation were branch point, branch point [per cm sq]. Age also played important role in distinguishing osteoporotic classes. The sensitivity of MO at Ward’s triangle and Greater Trochanter was 91.8%, 65.6%, respectively. The specificity of MO was 100% at Ward’s triangle and Greater Trochanter. Conclusion : Bony trabecular characteristics obtained using radiological bone morphometric analysis seem to be related to bone mass.

마이크로 프로세서를 이용한 RNS 디지털 필터의 실현에 관한 연구

최병도,김문수 釜慶大學校 1997 釜慶大學校 論文集 Vol.2 No.2

Digital filiters are imcreasingly beimg used in the ranges of instrumentation. space communication and cintrol engineering. RNS(residue number system) offers the possibility of high speed opration and error detection/correction because the separability of arithmetic operation is possible. This paper shows the implementation of RNS digital filter using micro processor. RNS digital filters are designed and then simulated by personal computer, Based on these results, RNS digital filter is implemented using ROM look-up table method for this study. 2nd-order recursive digital filter is implemented and the result is same with that of computer simulation. We are confirmed that it is very easily realized using the micro processor for RNS special digital systems.

싸이리스터 PWM정류기를 이용한 유도가열장치

崔泳道,李景彬,韓炳文 明知大學校 産業技術硏究所 2002 産業技術硏究所論文集 Vol.21 No.-

This paper proposes a new induction heating system composed of a thyristor PWM rectifier with a resonant commutation circuit. The operation of proposed system was first analyzed by a theoretical approach with equivalent circuits. And its verification was performed by computer simulations with EMTP. The proposed system can provide a solution for the power factor problem of the existing high-power induction heating system, which uses the line-commutated thyristor bridge in rectifier side.

Cone beam CT를 이용한 비글견 발치창 치유과정에 대한 방사선학적 연구

최동훈,이완,김대석,이병도 대한구강악안면방사선학회 2009 Imaging Science in Dentistry Vol.39 No.1

Purpose : To longitudinally observe the healing process of extracted socket and the alterations of the residual ridge in healthy adult dogs using cone beam CT (CBCT). Materials and Methods : The mandibular premolars of two beagle dogs were removed and the extraction sites were covered with the gingival tissue. CBCTs (3D X-ray CT scanner, Alphard vega, Asahi Co.) were taken at baseline and at 1 week interval for 12 weeks. Radiographic density of extracted wounds was measured on normalized images with a custom-made image analysis program. The amount of alveolar crestal resorption after the teeth extraction was measured with a reformatted three-dimensional image using CBCT. Bony healing pattern of extracted wound of each group was also longitudinally observed and analyzed. Results : Dimensional changes occurred during the first 6 weeks following the extraction of dogs’ mandibular premolars. The reduction of the height of residual ridge was more pronounced at the buccal than at the lingual aspect of the extraction socket. Radiographic density of extracted wounds increased by week 4, but the change in density stabilized after week 6. New bone formation was observed at the floor and the peripheral side of extracted socket from week 1. The entrance of extracted socket was sealed by a hard-tissue bridge at week 5. Conclusion : The healing process of extracted wound involved a series of events including new bone formation and residual ridge resorption.

성인의 경부 전면 중앙부위에서 발생한 기형종 1예

최월용,정효진,채종인,하태인,정상렬,이광재,채병도,최영식 고신대학교 의학부 2004 高神大學校 醫學部 論文集 Vol.19 No.1

Teratomas are embryonal neoplasms that show characteristics of three germ cell layers(ectoderm, mesoderm, and endoderm). They are distributed in the following regions: sacrococcygeal(57%), gonadal(29%), mediastinal(7%), cervical(3%), retroperitoneal(4%), and intracranial(3%) regions. Non-gonadal treatomas present in infancy whereas gonadal are seen in adolescence. Especially, teratomas that occurred in midline neck of adult are very rare and are confused with thyroglossal duct cysts, cystic hygromas, and thyroid tumors. We report, along with the review of appropriate literature, a case of histopathologically confirmed benign teratoma in the midline neck of a 33 years old woman.

화염을 내포하는 영상의 검출에 대한 연구

도용태,최병수 대구대학교 정보통신연구소 2012 情報通信硏究 Vol.9 No.1

화재는 여러 가지 재난들 중에서 가장 흔하다. 따라서 이에 대한 효과적인 대책이 필요하지만, 기존의 연기 검출기를 비롯한 단순한 형태의 센서들은 자주 오작동하는 문제가 있다. 이 문제에 대한 해결책으로 카메라의 영상을 사용하여 화재를 검출하는 방법에 대한 관심이 근래 증대되고 있다. 본 논문에서는 화염을 포함하는 영상을 검출하기 위한 기법이 서술된다. 주어진 영상을 다수의 영역으로 나눈 후, 각 영역의 특성으로부터 화염의 존재 유무를 판정한다. 서술된 기법은 다양한 영상들을 이용하여 그 성능을 평가하였으며, 그 성공률은 약 73%이었다. 이와 같은 결과는 연속 영상에 의한 화재감지에 사용되어 더 높은 성공률로 개선될 수 있을 것이다. detection using camera images. In this paper, a technique to detect images containing flames is described. After segmenting a given image into multiple regions, the existence of flames is determined from the characteristics of each region. The described technique was tested using various images, and we could get about 73% of success rate. This result may be improved by detecting fire in image sequences.

퇴행성 슬관절염에 대한 제통단의 안정성과 효능 임상연구

서병관,류성룡,강중원,안경애,이상훈,최도영,김건식,이두익,이윤호,이재동 EAST-WEST MEDICAL RESEARCH INSTITUTE KYUNG HEE UNI 2005 東西醫學硏究所 論文集 Vol.2005 No.-

Objectives : In order to investigate the efficacy and safety of the newly developed herbal medicine Jetongdan, a placebo-controlled randomized clinical trial of patients with osteoarthriotis of the knee was undertaken. Methods : Data were obtained from 80 patients with OA of the knee. After the enrollment, they were asked to answer a disease-specific questionnaire (Western Ontario and McMaster Universities (WOMAC) OA index) and analyzed with the erythrocyte sedimentation rate (ESR) in order to evaluate the efficacy of Jetongdan, and analyzed for aspartate transaminase (AST) level, alanine transminase (ALT) level, blood urea mitrogen (BUN) level, and creatinine (Cr) level in order to evaluate the safety of Jetongdan. Results : The liver function and renal function did not deteriorate after treatment with Jetongdan. Composite WOMAC score and physical function subscale was improved, but pain subscale, stiffness subscale, and ESR were not improved by Jetongdan. This was possibly because the baseline characteristics of the two groups were not homogenized after randomization. Conclusions : Jetongdan could be a promising treatment option for osteoarthritis of the knee. Further study in a larger population with appropriate severity grades is recommended.

몇 가지 전이금속, Ni(II) 및 Zn(II) 3,6-bis(2'-pyridyl)pyridazine 착 화합물들의 세포 독성효과

권병목,이정옥,최상운,성낙도 충남대학교 형질전환복제돼지연구센터 2007 논문집 Vol. No.10

A series of cytotoxic activities (ED_(50)) in vitro against six human cancers (lung cancer, uterine cancer, skin cancer, brain cancer, colon cancer and adenocarcinoma) and their seventeen cell lines of 3,6-bis(2'-pyridyl)pyridazine, 1, 3,6-bis-(6'-methyl-2'-pyridyl)pyridazine, 2 and their transition metal, Ni(II), Cu(II) and Zn(II) complexes, 3~6 were measured. Particularly, the results revealed that the cytotoxic activities against the brain cancer cell line (SNB-19) and the colon cancer cell line (SW62) of bis-[3,6-bis-(6'-methyl-2'-pyridyl)pyridazine-k^(2)N^(2),N^(3)]chlorocopper(II)perchlorate, 4 were shown to be higher than that of the first generation anticancer agent, Cis-platin. 6종의 인체 암(폐암, 피부암, 결장암, 자궁암, 선암 및 뇌암)과 그의 17가지 세포주들에 대한 리간드 화합물 3,6-bis(2'­pyridyl)pyridazine(1)과 3,6-bis(6'-methyl-2'-pyridyl)pyridazine(2) 그리고 그들의 전이금속(Ni(II), Cu(II) 및 Zn(II)) 착 화합물들 (3~6)의 세포독성을 각각 측정하였다. 그 결과, 특히 Cu(II) 착화합물, bis-[3,6-bis-(6'-methyl-2'-pyridyl)pyridazine-k^(2)N^(2),N^(3)]chlorocopper(II)perchlorate (4)는 뇌암(SNB-19)과 결장암(SW-62) 세포주에 대하여 제1세대 항암제인 Cis-platin보다 높은 세포독성을 나타내었다.

癩病發病의 年齡의 曆年別 趨勢

任炳昇,崔永燦,金道一 大韓癩學會 1979 癩學 會誌 Vol.12 No.1