보행 시 노인의 상체 움직임에 대한 3차원적 분석

김희수,윤희중,류지선,김태삼 한국운동역학회 2004 한국운동역학회지 Vol.14 No.3

H. S. KIM, H. J. YOON, J. S. RYU, T. S. KIM. The Three Dimensional Analysis of the Upper Body's Segments of the Elderly during Walking. Korean Journal of Sport Biomechanics, Vol. 14, No. 3, pp. 1-15, 2004. The purpose of this study was to investigate the kinematic variables of the upper part of the body for 8 elderly men during walking. For this study, kinematic data were collected using a six-camera (240Hz) Qualisys ProReflex system. The room coordinate system was right-handed and fixed in space, with righted orthogonal segment coordinate systems defined for the head, trunk, and pelvis. Based on a rigid body model, reflective marker triads were attached on the 3 segments. Three-dimensional Cartesian coordinates for each marker were determined at the time of recording using a nonlinear transformation(NLT) technique with ProReflex software (Qualisys, Inc.). Coordinate data were low-pass filtered using a fourth-order Butterworth with cutoff frequency of 6Hz. Three-dimensional angles of the head, trunk, and pelvis segment were determined using a Cardan method. On the basis of each segment angle, angle-angle plot used to estimated the movement coordinations between segments. The conclusions were as follows; (1) During the support phase of walking, the elderly people generally kept their head the flexional and abductional posture. Particularly, the elderly displayed little internal/external rotation. (2) The elderly people showed extensional and external rotation postures in the trunk movement. Particularly, It showed the change from adduction into abduction at the heel contact event of the stance phase. (3) The elderly people showed almost same pelvis movement from the flexion into extension, from the abduction into adduction, and from internal rotation into external rotation at the mid stance and toe off of the stance phase.

경연 대회를 통한 초ㆍ중고생의 창의력 신장 효과에 관한 연구

이희복,육근철,류해일,김현섭,김희수,박달원,유병환,김선효,김여상,서광수,변두원,서명석,배성효,박종석,심규철,이성희 공주대학교 과학교육연구소 2001 과학교육연구 Vol.32 No.1

미래 사회를 대비하기 위한 개인의 개성을 존중과 창의적인 능력을 지닌 인간을 양성을 목적으로 충청남도 지역의 초 ㆍ 중고등학생들을 대상으로 한 창의력 경연대회가 공주대학교 과학교육연구소에서 개최되었다. 충청남도 초 ㆍ중 ㆍ 고등학생들을 대상으로 실시한 창의력 경연대회는 창조적 아이디어를 내어 스스로 문제를 해결해 나갈 수 있는 교육 프로그램을 제공하는 좋은 기회였음이 확인되었으나, 일부의 팀에서만 참신하고 재미있는 아이디어들이 제안되었다. 여학생의 참가자 수가 상당히 증가하였으며, 대체적으로 입상권의 학생들의 상당 부분이 여학생이라는 것이 특이할만하다. 학년이 올라감에 따라서 창의적인 아이디어를 내는 양이나 질에 있어서 뒤떨어지는 것으로 분석되었으며, 토론 학습의 적응력이 미흡하고 발표력 및 청취력에 있어서도 떨어지는 것으로 나타났다. 따라서 중 ㆍ고등학교의 학교교육에서도 학생들에게 프로젝트형 탐구학습 프로그램의 적용은 물론 토론식 수습을 통한 학생들의 사고의 전환의 기회를 제공해야 할 것으로 사료된다. The creativity competition was held to foster the creativity of elementary and secondary school students in the Institute of Science Education, Kongju national University. It was found that the creativity competition effected on the improvement of inventing creative ideas and problem solving activities. But, only some competitors participated in semifinal and final contests, presented original and interesting ideas. More female students participated in competition than last year. More female participants were awarded a prize than males. Totally, participants were defective in discussion and communication, and presentation and listening ideas. Increasing grades correlated inversely with creativity and originality. There is need of inquiry project teaming programs and presenting opportunities of conversion of thinking by discussing instructions in school

전기비저항을 이용한 지하매설물 탐사(II) - 현장실험 중심으로

류희환,조선아,김경열,조계춘,Ryu, Hee Hwan,Cho, Seon Ah,Kim, Kyoung Yul,Cho, Gye Chun 한국터널지하공간학회 2017 한국터널지하공간학회논문집 Vol.19 No.3

관로, 전력구 등 지하매설물의 불투명한 존재여부 및 부정확한 정보로 인해 신규 지하매설물의 계획 노선, 설계, 시공에 많은 문제를 야기시키고 있다. 이에 Ryu(2015) 등은 전기장 해석을 통해 지하매설물의 크기, 위치, 방향 등을 예측할 수 있는 식을 제안하였다. 3개의 현장에 적용하여 싱크홀 존재 여부 및 크기와 지하매설물의 위치, 크기, 방향을 예측하였으며, 예측된 결과를 토대로 설계에 반영되고 후속 조치가 수행되었다. The uncertain existence and insufficient information of underground structures, such as pipe lines and cable tunnels, is causing many problems related to route plan, design, construction of new underground structures. The theoretical equations that is able to predict the location, size, and direction of underground structures through electric field analysis are suggested at the previous study (Ryu., 2015). Three field tests were performed for predicting the location, size, and direction of underground structures and the existence and size of sink-hole. Prediction results were reflected at the design and follow-up measures were performed.

객체지향 프로그램 종속성 그래프를 이용한 클래스 계층구조의 재구조화에 대한 연구

류희열,권재길 동의공업대학 2001 論文集 Vol.27 No.1

In this paper, we presents a restructuring method for class hierarchies which can optimize member variable and member function using Object-oriented Program Dependence Graph(OPDG). In the progress program evolution, if the member variable and member function is inserted and updated to classes, it can be included the useless code or unappropriate inheritance relationship. The reuse of such classes is caused to the code errors and the increase of maintenance cost. In this paper, we propose a restructuring method that removes the classes, member variables and member functions that don't exist relationship with the used object, variable and methods in main function and removes the same member functions and member variables of subclass as superclass, we can obtain the simplification of program code and the progress of system performance by eliminating unused member variables and member functions, It can be increased to the efficiency of program testing and maintenance.

객체지향 프로그램 종속성 그래프를 이용한 객체지향 프로그램 슬라이싱에 관한 연구

류희열 동의공업대학 2000 論文集 Vol.26 No.1

This paper presents a new Object-oriented Program Slicing Algorithm for computing object-oriented program slice using a graphic representation that is called Object-oriented Program Dependence Graph(OPDG). A proposed slicing algorithm is based on an interprocedural slicing algorithm that utilizes vertex reachability problem, and the slicing criterion in the object call and method call is transformed. The time complexity of proposed slicing algorithm is decreased. A proposed slicing algorithm is able to compute correct program slice for object-oriented program and incomplete program like a single class. A new slicing algorithm can be applied to reverse engineering, testing, visualization and other various fields to analyze system.

추측과 반박을 통한 수학적 발견논리

류시규,김희정 동국대학교 교육연구원 2000 교육문제연구 Vol.15 No.-

For a long time the mathematical knowledge was understood as the group of the eternal truth, proved through the deductive inference of the absolute truth. Therefore, we regarded as all the mathematical prepositions as the absolute truth and any refutation or any presentation of objection was not necessary. Such point of view affected the mathematics education and caused the students to regard the mathematical knowledge as an informative one acquired from the accurate verification rather than from critical approach. Thus the mathematical knowledge were provided mechanically to the students in rather memory-oriented way, which, as a result, becomes one of the main reasons that the students regard the mathematics as an uninteresting and dull learning. In 20th century, however, lots of endeavors were made to improve such mathematics education. As one of the studies, more attention started to be paid to not only the informative aspect of mathematics but the methodological aspect and the importance of speculation. Affected by G. Polya, an mathematician who studied this matter and K. Popper who ever led the critical falsificationalism, Lakatos insisted that the mathematic education should provide the students with more opportunity to consequently get into more reasonable knowledge, rather than just a simplified calculation-oriented class or mechanical thinking, like the mathematics has been developed steadily all through long historical steps. Lakatos also argued that such improvement in inference capability can be accomplished through comparing the opinions by discussions with others and reaching more mutually reasonable point. And it will correspond to the pursuit of rationality, ultimate goal of mathematics education. In this paper, therefore, we would like to examine into the features of mathematical knowledge and its progressive process which Lakatos ever stated and then I would try to apply it to the models of mathematics class.

괄루근의 Glycosidase들에 대한 연구

류병호,양승택,조은정,김동수,문윤희,김희숙 慶星大學校 1996 論文集 Vol.17 No.2

Several glycosidase activities, α-galactosidase, β-galactosidase and β-fucosidase and their isozymes were founded in Trichosantes kirilowii root, Trichosantes radix. The activities of α-glucosidase, β-glucosidase and α-fucosidase were also assayed but were not detected. Those glycosidases were isolated and partial purified glycosidases by acid-treated Sepharose-6B, anion exchange Mono-Q HPLC, DEAE-Sephacel, butyl-toyopearl hydrophobic column chromatographies. However, these glycosidases need to be purified more homogeneous and characterized.

형광검출 역상 액체크로마토그래피에 의한 Histamine의 정량

유희춘,김형룡,김상현,김대기,이영미,김형민,안년형,신태용 우석대학교 의약품개발연구소 1996 藥學硏究誌 Vol.1 No.-

Histamine을 정확하고 신속하게 정량하기 위해 9.Fiuorenylmethyl chloroformate를 형광유도체화제로 하여 역상 HPLC법으로 정량하였다. 히스타민을 형광유도체화할 때 반응액의 pH, 반응시간, 형광유도체화제의 농도 등 최적 반응 조건을 검토하였다. 이 방법으로 히스타민을 분석한 결과 0.1~0.5ug/ml의 농도범위에서 상관계수가 0.922인 양호한 직선성을 나타내었으며 검출한계는 0.01??/ml였다. A rapid and simple method for the determination of histamine by reverse-phase high performance liquid chromatography with fluorescence detection was established. 9-Fluorenylmethyl chloroformate(FMOC) was used as fluorescent derivative reagent. The optimum conditions for the derivatiation such as pH, reaction time and he concentration of FMOC were investigated. Linearity of calibration curve was obtained between 0.1ug/ml/and 0.5ug/ml(r=0.922) and the limit of detection was 0.01ug/ml.

탐구형 기하 소프트웨어 환경에서 피드백을 활용한 증명학습에 관한 연구

류희영,조민식 한국교원대학교교육연구원 2006 敎員敎育 Vol.22 No.3

탐구형 기하 소프트웨어의 환경에서 기하교육이 유용하다는 많은 연구 결과가 있었다. 본 연구에서는 소프트웨어의 환경에서 교사가 적절한 피드백을 주었을 때 작도문제를 통한 증명학습에 어떠한 영향을 주는지에 대하여 분석하였다. 그 결과 교사는 학생들의 수준을 적절히 판단하여 적합한 피드백을 줄 수 있고 학생들의 사고력의 향상과 지속성을 관찰할 수 있었고 학습태도에 긍정적인 영향을 끼치는 것으로 나타났다. The purpose of this study is to investigate, through case study, how the feedback with dynamic geometry software has influence on the improvement of proof learning and student's attitude. Analysis of data including worksheets, computer activities, and interviews revealed that collaborative learning is enhanced and student's attitudes could be changed positively.

핵폐기용 실험글라스고화체의 구조 및 특성에 관한 연구

류봉기,박희찬,박성수 釜山大學校生産技術硏究所 1996 生産技術硏究所論文集 Vol.51 No.-

핵연료의 재처리공정중에서 방출되는 high-level방사성폐액을 안정한 글라스형태로 고화하여 처리하는 글라스고화법이 사용되고 있다. 본 연구에서는 고화글라스구성성분의 하나인 Pb가 글라스의 용해도, 글라스중에서의 존재형태, 결정화에 미치는 영향을 UV, XRD, TG등을 이용하여 검토하였다. Pd의 용해도는 Tg∼1200℃에서 수 십-수 백ppm정도이며, 용해도를 전후하여 각각 2가이온 및 콜로이드상태로 존재한다는 것을 확인하였다. 그리고 Pb는 결정화에있어서 결정화를 촉진하였으나, Mn, Cr, V, Sb등의 다원자가원소의 첨가에 의하여 결정화를 억제할 수 있었다. Glass is an attractive form for the permanent and secure disposal treatment of high-level radioactive liquid wastes from high-level nuclear waste re-management process. In present work, we investigated the effect of glass solubility, existing form from of Pd in glass, and crystallization of glass on the Pd behaviour in the waste glass using UV, XRD, and TG. The solubility of Pd was from several 10s to several 100s ppm in Tg∼1200℃, and we found Pd exists as bivalent ionic or colloidal form at around the value of Pd-solubility in glass matrix. In crystallization, Pd in glass was helpful for promoting the crystallization, but Mn, Cr, V, and Sb additives retarded and controlled the crystallization.