Mg₂SiO₄ : La, Ho 열형광선량계에서 활성제 농도가 글로우 커브에 미치는 영향 La, Ho TLD on Activation Concentration

김영국,손인호,채건식,노경석,오재근,이은숙 경남대학교 신소재연구소 1996 論文集 Vol.6 No.-

본 연구에서는 Mg₂SiO₄에 활성화 물질로 La, Ho를 첨가하여 열형광체를 제작하였고 불순물의 농도를 1wt.% ∼5 wt.%까지 변화시키면서 열평광강도의 glow curve를 측정하였다. 도한 열형광체의 glow curve를 peak shape법으로 분석해서 TL특성에 대한 포획 매개변수와 활성화 에너지, 발광차수, 선량의존성등을 조사하였으며, 그 물리적 특성을 조사하고 선량계로서 타당성과 실용성을 확인하였다. The Mg₂SiO₄: La, Ho thermoluminescent phospher has been prepared by sintring Mg₂SiO₄after doping the transition elements La and Ho. The heating rate is 10℃/sec at this thermoluminescent phospher are heated. The maximum peaks are found in the measured Mg₂SiO₄: La and Ho. TL glow curve at 229℃ and 345 C when the 1 wt.%-5 wt.%. The glow curve of TLD increased TL intensity and temperature of peak appears to the high temperature when the heating rate is l0℃/sec-25℃/sec. The activation energy of the main peak has been estimated by the peak shape method. The estimated activation energies are 1.77 eV. 1.52 eV respectively. The thermoluminescence process in Mg₂SiO₄: La and Ho are found to the 2nd order when the main peak of the glow curve is analyzed by peak shape method. The dose responses of Mg₂SiO₄: La and Ho TLD are linear up to intensity of X-ray.

로봇프로그래밍 학습이 초등학생의 논리적 사고력 신장에 미치는 영향

채재호,배영권,유인환 韓國敎員大學校 敎育硏究院 2008 敎員敎育 Vol.24 No.2

로봇 교육의 필요성에 대한 관심이 고조되면서 초등학교에서도 방과 후 교실 등의 방법으로 로봇을 교육적으로 활용하는 사례들이 증가하고 있다. 이와 더불어 지식기반사회의 핵심 요소인 창의성을 향상시키기 위한 방법으로 프로그래밍 교육을 초등학교에서부터 실시해야 한다는 연구가 받표되고 있다. 이에 본 연구에서는 로봇을 활용하는 프로그래밍 교육은 학습 동기 유발이나 논리적 사고력 및 문제해결력 신장에 도움을 줄 수 있을 것으로 기대하고 초등학교 프로그래밍 교육에서 로봇의 활용을 제안하였다. 또한,로봇 프로그래밍 학습 프로그램을 개발하고,○○교육대학교 부설 정보영재교육원의 초등학생을 대상으로 적용한 결과,논리적 사고력 중 비례 논리,확률 논리,상관 논리,조합 논리가 신장된 것으로 나타났다. 따라서 본 연구에서 실시한 로봇프로그래밍 학습이 학습자의 논리적 사고력을 신장시키는데 기여 했다고 볼 수 있으며,본 연구에서 제안한 로봇을 활용하는 프로그래밍 교육은 초등 학생을 위한 프로그래밍 교육에 다양하게 응용될 수 있을 것이다. With the increasing concern about the necessity of robot education, there have increased the cases where the education is conducted by applying robot programming after school at an elementary school. Together wlth this, the research on the necessity that basic curriculum for enhancing creativity be implemented from the elementary course, and the cases where the demand for robot programming education so that motivation for learning, or logical thinking abilities and problem-solving abilities could be promoted have been also on the increase. Therefore, this study tries to develop and apply a programming education program for information prodigies by using a robot to investigate effects of such program on growth of logical thinking. As a result of applying the developed method to 20 fifth graders of an information prodigy education facility elementary school, annexed to an educational college, it turned out that, out of all logical thinking abilities, proportional logic, probabilistic logic, correlation logic, and combinational logic have significantly increased. Therefore, a robotic programming education that uses the proposal in this study is contributed to enhance logical thinking abilities and is expected to be very good for programming education for elementary students.

다목적 계획법을 활용한 김해와 부산지역 절화생산 농가의 영업계획 수립에 관한 연구

채수천,차재호,손기철 건국대학교 생명과학연구원 1994 생명과학지 Vol.1 No.-

본 연구는 절화 생산농가의 경영실태를 파악하고 경영진단을 위한 제 지표를 작성하고 주어진 가용 자원조건하에서 농가 gross margin의 극대화와 농번기 고용노동의 극소화를 동시에 얻을 수 있는 영농 계획수립 대안을 제시해 보고자 다목적 계획법(Multiobjective Programming)분석을 시도하였다. 본 연구의 기초가 되는 자료의 조사는 부산, 김해지역의 18개 절화 전업농가를 대상으로 하였으며, 그 결과를 요약하면 다음과 같다. 1) 조사농가의 호당 평균 경지면적은 1,550평이었으며 그중 75.7%는 임대경지로서 매우 영세하였고 호당 자가 노동력은 2.4인이였으며 고용 노동력은 1.7인이었다. 2) 재배현황은 Carmation, 장미, 안개초, Gerbera, 국화, Gladiolus, Iris, 금어초, Freesia 등의 9작목에 21개의 작부형태였다. 3) 작목별 노동 투하시간은 장미가 1,578시간으로 가장 많았으며, 글라디올러스 Ⅲ가 296시간으로 가장 적었다. 이익계수는 장미가 7,748천원으로 가장 높았고 다음은 Carnation, 안개초의 순이었다. 4) 다목적 계획 수립 기법을 이용한 이익의 극대화와 농번기 노동력의 최소화를 동시에 만족시켜주는 해결책으로는 위험을 선호하는 형(A, E 대안), 위험을 기피하는 형 (B대안), 중립적인 형(D대안)의 4가지 형태의 대안으로 나타났다. This case study is to investigate a real management condition of cut flower production farm houses and then to make indices for economic analysis, and on the basis of that, to generate a few possible alternatives for farmer's decision-making from problems involving conflicting goals which were related to maximize total gross margin and to minimize labour requirements in labour peak season such as April by multiobjective programming using NISE method. 18 farms located in Kimhae and Pusan area were selected as sample farms and surveyed for analysis. The results were as follows; Average farm area per farm house surveyed was 1,550 pyeong and 75.7% of area was leased, and self labour power and employment labour power per farm house was 2.4 and 1.7 persons, respectively. 9 crops such as carnation, rose, gypsophila, gerbera, chrysanthemum, gladiolus, iris, snapdragon and freesia were presently cultivated as 21 cropping patterns. Labour requirement was the largest for rose by 1,578 hours, and benefit coefficient was the largest for rose by 7,748 thousand won per 100 pyeong and followed by carnation and gypsophila. The alternatives of possible policies for cut flower production were found to be A and B as aggressive policies and C as a moderate policy, finally B as a conservative policy.

十二變에 대한 考察 : 六元正紀大論을 중심으로

채영진,남호현,이석모,여성원,한성규,이재원,안민식,정헌영,금경수 한국전통의학연구소 2003 한국전통의학지 Vol.13 No.1

The six kinds of natural factors(It refers to wind, cold, summer-heat, dampness, dryness and fire.) is constantly moving to maintain the balance of whole climate of one year. Four seasons are the largest mediation of whole climate of one year. The cold and the heat have the relationship of mutual intervention. The dampness and the dryness have it also. In this process they raise various climate appearance. And that various climate appearance influence the whole lives on the earth. This paper is concerned with the classification of them.

개선된 Bridgman법으로 성장한 Bi₂Sr₂CaCu₂O_(8+δ) 單結晶의 초전도성

채건식,손인호,설정식,이수대,김영국,전동성,오재근,강성욱 경남대학교 환경문제연구소 1995 환경연구 Vol.17 No.-

The Bi₂Sr₂CaCu₂O_(8)+_(δ) single crystals are grown from the melt using a stoichiometric starting composition fer the cautions. The size and thickness of the Bi₂Sr₂CaCu₂O_(8)+_(δ) crystals depends on the cooling rate. The lower the cooling rate, the bigger and thicker the Bi₂Sr₂CaCu₂O_(8)+_(δ) crystals become. Bi₂Sr₂CaCu₂O_(8)+_(δ) X-ray diffraction(XRD) measurements of the single crystals were carried out using the radiation source of Cu Kα . In these Patterns only the (0,0,2n) diffraction appeared. The result indicated that the cleared surface of the single crystal was of the a-b face, and that the single crystal had a single phase without any undergrowth with 7K and 85K phases. In addition, although the figure is not shown, XRD patterns from (006) to (00□) were observed in the range of 2θ=0 to 60 degrees. The characterization of as-grown single crystals have been analyzed by Laue X-ray backsdattering along the c-axis and X-ray precession experiments. The result of magnetic moment vs Tc in 10 Gauss for a crystals were measurements indicated that the samples have a superconducting transition temperature of 85K.

치과용 콘빔CT영상에서 총의치 장착 후 하악과두의 위치변화

이봉호,김재덕,정재헌 대한구강악안면방사선학회 2008 Imaging Science in Dentistry Vol.38 No.1

Purpose : The aim of this study was to evaluate the change in the position of the mandibular condyle within articular fossa by a CBCT after wearing complete denture (CD). Materials and Methods : CBCT of 34 temporomandibular joints were taken from 9 male and 8 female patients with CB Mercuray (Hitachi, Japan) before and after wearing a CD for rehabilitation. Position of mandibular condyle within articular fossa at centric occlusion was evaluated with Vimplant2.0(CyberMed, Korea) on the central parasagittal view and curved panoramic coronal view of the condylar head. A statistical evaluation was done with SPSS. Results : The range of anteroposterior positional rate (AP) of condylar head within articular fossa was -16-5 and -10-12 respectively on the right and left sides. Before wearing CD, the AP rate showed discrepancy between right and left sides (p<0.05). After wearing CD, both condyles showed a tendency to decrease in posterior condylar position (right side; p<0.05). The average discrepancy between right and left side in mediolateral positional rate (MD) was 15.5 and 4.5 respectively before and after wearing CD. The improvement was observed in mediolateral relationship of both condylar heads after wearing CD (p<0.01). Before wearing CD, the average horizontal angle of long axis of condylar head was 79.6±2.7˚and 80.1±5.7˚ respectively on the right and left sides. After wearing CD, both condyles were rotated in the same direction in average on axial plane. Conclusion : We observed with CBCT the significant clinical evidence in case of positional change of mandibular condyle after wearing complete denture.

생장점 배양에 의한 딸기 무균묘 생산기술

강호종,채윤석,윤재길 진주산업대학교 2001 論文集 Vol.40 No.-

In order to produce the virus-free seedlings of Strawberry(Fragaria glandiflora var. Akihime), basal media and concentration of hormone were investigated to determine which is propoer to shoot tip culture of strawberry. The results are followings. LS(Linsmaier & Skoog) medium showed 87% survival rate, indicating the most favorable medium for the growth of the apical meristem. The effects of hormone concentration on organogenesis showed that the combined treatment with NAA and BA at concentrations of 0.2㎎/ℓ and 1㎎/ℓ respectively, showed 98.7% organ formation as compared to 27.3% in the untreated, but did not root formation. Whereas, the combined treatment with NAA and BA at concentrations of 0.2㎎/ℓ and 0.2㎎/ℓ respectively, showed 91.6% shoot formation and 52.7% root formation. After seedlings in vitro were transplanted to vinyl pot, root and leaf numbers decreased as shoot number of seedlings in vitro are many. Virus infection rate was 46.6% which is relatively low infection rate.

우리나라 物價變動會計制度의 導入方案에 관한 硏究

朴範鎬,宋在萬,李勉榮,蔡奎學 홍익대학교 경영연구소 1985 경영연구 Vol.9 No.-

As accounting is an outgrowth of society, we can say that the accounting system of each country is derived from its economic situation and from the people's outlook no economic values. Thus when the economic situation of one country is different from that of another country, and the outlook of the people of one country is different from that of another country, they the accounting system for changing prices as well as general accounting systems may be different. Actually accounting systems of different countries are not identical. The writers of this paper try to find an accounting system for changing prices suitable to out country. The writers review various theories on accounting systems for changing prices, survey accounting systems of various countries and basic patterns of such systems, and in vestigate the actual conditions of our country in order to provide accounting information which reflects the effect of changing prices and to give a practicable accounting system. In this paper, the writers state their opinions about accounting systems for changing prices as follows: 1)The demand for the publication of accounting information about the effect of changing prices upon the financial status and operational result of a business is a world-wide trend. Considering that our industries are now aiming at opening a capital market, we should establich an accounting system for changing prices in order to follow the world-wide current. 2) As we intend to follow the world-wide current, to get useful accounting information, and to get a practicable accounting system, the most suitable system for us is the current value accounting system The current value accounting system mentioned here does not provide information supplementary to that of the financial statements based on the historical cost but it provides a substitute of the current value financial statements for those based on the historical cost. Financial statements based on current values are standard statements. 3) In our country, there are no active studies or discussions on the accounting systems for changing prices. We need to set up an organization entirely responsible for the establishment of a desirable accounting system for changing prices, responsible for the establishment of guidelines for putting the system to use, and responsible for the coordination of the interests of those concerned.

사판형 가변행정 압축기의 커넥팅 로드의 동역학적 해석

김재호,신영재,한인식 경북대학교 산업기술연구소 1991 産業技術硏究誌 Vol.19 No.-

Connecting rods of variable displacement compressor(V-5 compressor) in high speed motion may undergo high stresses and strains due to increased dynamic forces. Fluctuation of the induced stress must be considered to predict fatigue fracture and service life in design of this compressor. Dynamic analysis is performed for V-5 compressor using constrained Newton-Euler equations of motion, considering the effects of friction and load. Dynamic stress fluctuation of connecting rod is investigated particularly. Connecting rod is assumed to be linear Euler-Bernoulli beam. When the equation of motion of connecting rod is derived, effects of rotatory inertia and shear deformation are neglected. Safety factor is calculated using maximum distortion energy theory and service life is predicted using Modified-Goodman criterion.

폴리에스테르아마이드에 관한 연구

趙淳彩,姜濚義,崔在炅 全北大學校 1985 論文集 Vol.27 No.-

Polyesteramide(PEA) was prepared by the polymerization of caprolactam and 6-amino-caproic acid with oligomer of polyethylene terephthalate, which was prepared by the reaction of terephthalic acid with ethylene glycol, and characterized by melting point, molecular weight and whiteness. The results are summarized as follows. (1) Molecular weight has no relation to melting point of PEA. (2) Molar fraction of caprolactam of stoichemistry has no relation to molecular weight of PEA. (3) Melting point of PEA decreased with the molar fraction of oligoester of stoichiometry and was still lower than that of polyethylene terephthalate. (4) Whiteness of PEA decreased with the molar fraction of oligoester of stoichiometry and superior to that of PEA from hexamethylenediamine and oligoester, in respect of whiteness.