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      • 鐵筋의 降伏後 壓縮剛性을 고려한 鐵筋콘크리트 橋脚의 非彈性 反復擧動

        정헌정 韓京大學校 産業大學院 2003 국내석사

        RANK : 248639

        본 연구에서는 철근콘크리트 교각의 비탄성 반복이력거동에 관한 특성을 파악하기 위해, 유한요소법을 적용한 해석적인 접근에 의해서 10개의 1/5 축소모형 시험체를 대상으로 해석하였고, 그 결과를 실험에 의한 결과와 비교함으로써 본 연구의 타당성을 입증하는데 목적을 두었다. 유한요소법을 적용하기 위한 콘크리트의 재료적 모델로는, 균열이 발생한 철근콘크리트 요소는 균열 방향과 균열에 직각방향으로 이방성을 갖는다는 직교 이방성 모델에 근거한 이축응력상태의 응력-변형도 관계를 기본적으로 적용하였다. 또한 균열의 발생으로 인한 강도와 강성의 감소, 철근의 항복, 철근과의 부착 효과 및 균열면에서의 전단전달 효과 등을 고려하였고, 압축철근의 항복후 강성을 보다 실제적으로 고려함으로써 콘크리트 부재의 비탄성 역학거동을 보다 정확하게 예측할 수 있었다. 압축강성을 고려한 해석치에 대한 실험의 항복강도비 및 최대강도비가 각각 0.86과 1.00으로서 고려하지 않은 경우의 해석치에 비해 실험결과에 더 근접하고 있다. 따라서 압축철근은 항복후에도 압축응력을 부담하고 있음을 알 수 있었으며, 본 연구의 해석방법에 의한 철근콘크리트 부재의 역학거동은 그 타당성이 있다. Analysis of ten one-fifth scale models of reinforced concrete piers using the two dimensional finite element method was presented in this paper. The Predicted behaviors from present analysis were compared with test result. The material models used in the finite element analysis are based upon the biaxial state of stress. This 'model assumes the orthogonal anisotropy that the reinforced concrete element with several cracks shows an anisotropic properties each in normal and parallel direction to the crack. The degradation of strength and stiffness due to the crack generation, yield of tension and compressive reinforcements, bond effect with reinforcement, and shear transfer at crack plane were considered in the analysis. Also, the realistic consideration about the compressive behavior of the reinforcement after yield gave rise to better simulation of inelastic mechanical behavior of reinforced concrete member. The ratio of yield and maximum strength from the test to those from the analysis with compressive stiffness after yield of reinforcing bar showed 0.86 and 1.00 respectively and it is closer to real behavior of test specimens than the analysis without compressive stiffness after yield of reinforcing bar. Therefore, it can be said that the reinforcing bar in compression can sustain some portion of compressive stress even after the reinforcing bar has been yielded.

      • 우리나라 家口의 過負擔 醫療費 및 貧困化 關聯要因

        정헌정 건양대학교 2015 국내석사

        RANK : 248639

        Background : Out-of-pocket payment was high and public health coverage was relatively low in Korea health care system. The aim of this study was to determine the related factors to occurrence of catastrophic health expenditure and impoverishment in Korea and to explore how catastrophic health expenditure influence to the impoverishment. Method : Subjects of this study were five thousand three hundred ninety-two households of Korea Health Panel data from 2008 to 2011. This study was analyzed to identify the related factors to occurrence of catastrophic health expenditure and impoverishment by chi-square test. Logistic regression were used to explore how catastrophic health expenditure influence to the impoverishment. Results : Four hundred ninety households experienced more than one episode of catastrophic health expenditure, seventy-two households for two episodes of catastrophic health expenditure. One thousand five hundred sixty-one households showed more than one episode of impoverishment and nine hundred and three households for more than two episodes of impoverishment. Occurrence of catastrophic health expenditure and impoverishment were increased in elderly, low educational attainment, economic inactivity, presence of family member with disabilities and chronic diseases. Particularly, impoverishment were increased in unmarried status, medical aid and leased or rented houses. In addition, occurrence of catastrophic health expenditure increased occurrence of impoverishment. Conclusions : Catastrophic health expenditure and impoverishment is an indicator measuring guarantees for health care system, which means it implied high out-of-pocket payments and low guarantees in health care system. It suppresses occurrence of catastrophic health expenditure and impoverishment, and increases accessability of healthcare services that the policies on healthcare insurance coverage was strengthened. Therefore, effective healthcare system establishment and reinforcement need to be sought in order to establish social security for medical cost.

      • 자기공명 혈관조영술에서 자장의 세기 변화와 유속 신호강도에 영향을 미치는 인자들에 관한 연구

        정헌정 高麗大學校 醫用科學大學院 2004 국내석사

        RANK : 248639

        자기공명혈관 조영술(Magnetic Resonance Angiography, MRA)의 가장 큰 장점은 위험한 요소가 거의 없다는 데 있다. 조영제를 주사 없이 혈관의 형태학적 정보와 혈 역학적인 정보를 제공하는 장점이 있어, 계속적으로 임상에서 발전되고 있는 MR 기법으로 이중 TOF기법은 뇌혈관조영술 기법 중 가장 기본적으로 이용되고 있다. 본 연구의 목적은 유체와 MRA 기법과 관련된 부가 인자들이 유체의 신호강도, 주변조직의 신호에 어떤 영향을 미치는지 알아보는 것이다. 이 실험적 연구에서는 비박동성 정속 유속 모델과 수돗물을 유체로 이용하여 여러 부가인자(TR, TE, Flow Velocity, Flip angle)들과 자장의 세기를 변화시키면서 SPGR 3D TOF MRA를 촬영한 영상의 자료에서 유체의 신호강도, 주변조직(아가)의 신호강도, 영상 배경의 잡음, 신호 대 잡음비, 대조도 대 잡음비의 값을 측정하였다. 측정된 값을 여러 변수의 변화와 연결시켜 분석한 결과 다음과 같은 결론을 얻었다. TR 증가하면 영상획득시간이 증가되고, 주변조직의 신호가 증가되어 대조도 대 잡음비 값이 감소한다. 그래서 TR은 최소한으로 선택하는 것이 좋은 영상을 만드는 조건이라고 사료된다. TE가 증가하면 대조도 대 잡음비가 감소되다 등가되는 현상을 보이고, 주변아가의 신호는 감소되었다. 영상 획득 시 TE는 배경의 신호를 고려하여 out of phase 시간에 맞추는 것이 중요하고 사료된다. 저장의 세기가 크면 유체의 신호나 주변조직의 신호는 큰 변화는 없으나 CNR, SNR은 크게 증가되어 나타났다. 그러므로 고자장이 저자장에서 보다 혈관을 묘출시키는데 훨씬 유리하다고 사료된다. 숙임각(flip angle)올 15°부터 25°까지 증가시키면 유체의 신호 강도가 증가되어 나타났다. 부가인자에 적절한 숙임각 선택이 중요하다. 유체의 속도를 증가시키면 유체의 신호강도, CNR, SNR이 감소되어 보였다. 인체의 혈류는 인위적으로 조절되지 않음으로 빠른 혈류의 경우 TR과 slab를 작게 하는 것 또한 좋은 영상을 얻는 방법이라 사료된다. The great merit or Magnetic Resonance Angiographies (MRA) is there are almost no risky factors available. It has such advantages as that it provides morphological and hemodynamic information of blood vessel without injection or Contrast Agency, and so MR technique has been progressed in clinical studies continuously. Among them, TOF technique is mostly used in the basic aspect out of Brain MRA. The purpose or this study is to examine how the additional factors that relate to fluid and MRA technique and Signal Intensity of fluid and Signals of surrounding. In this experimental study, using a flux model having nonpulsatile and constant rate, and tap water as fluid, I measured Signal Intensity or fluid and of surrounding organisms as well, and noise of background image, signal to noise ratio and contrast versus noise ratio at the materials of image that pictured SPGR 3D TOF MIRA, changing various additional factor, such as TR, TE, Flow Velocity, Flip angle as well as the strength of magnet. Results from the analysis, in which the analysis, in which the measured values were related to the changes of a number of variables, revealed the followings conclusions. If TR increases, the signals or surrounding organisms also increase, and that the value of contrast vs noise decreases, and Image Acquisition Time increases. Therefore, it i8 thought that to select TR to a minimum is a condition for producing a good image. When TE increased, Signal to Noise Ratio revealed such phenomena as that it kept decreasing at the beginning, but from certain instance, it started to increase, and the signals from peripheral regions showed a decrease. When doing Image Acquisition, it is thought important that TE is to be adjusted at the time out of phase considering signals of background. When the strength of Magnet become large1, there were no significant changes in the signals of fluid and surrounding organism, however, CNR and SNR displayed a larger increase. Thus, it is thought that High Tesla is much more efficient to depict blood vessel than Low Tesla. When increased flip angle from 15 to 25, Signal Intensity of fluid showed an increase. It is important that an adequate flip angle be selected for additional factors. When the velocity of fluid increased, Signal Intensity of fluid, CNR and SNR revealed a decrease. Since the blood now in human body is not regulated artificially, it is thought that to keep TR and slab smaller, in case of fast blood flow, is also a good method to get a decent image.

      • 『고향』의 현실인식과 인물의 전형성 연구

        정헌정 상명여자대학교 교육대학원 1996 국내석사

        RANK : 248639

        Lee, Ki Young's novel, 『Gohyang』(Home Town), is a full-length novel published in 『Chosun Ilbo』(Chosun Daily Newspaper) in a style of a serial novel. This work is one that based on the background of a farm village so called 'Wonter' in Chosun, South Chungchung province, describes Japanese exploitation of Korean farmers in the colonial period, thereby rural devastation, extensive dissolution of rural community(the farming class) and continuous occurrence of needy peasants due to colonial capitalism, thereby the farmer's turning to the labourer and the necessity of the union of labourers, and the looks of the living of the poor farmers and labourers experiencing strikes, tenancy disputes, etc. In this paper, for a purpose to analyse Lee's novel- 『Gohyang』(Home Town), a period that the work depicts through the lives of the characters was analysed, and then the dispositions of the characters were analysed. In the first place, as important elements for the historical background, land inspection business, railway construction, and the yarn factory constructed in the up-district which all had been materialized forcedly by Japanese were closely reviewed and with what perspective those things had been depicted were looked in. Findings in such a review are that land inspection business had resultantly made the expelled Korean farmers from their land form an extensive needy peasant class, railway construction had the function to carry out the products of Chosun to Japan, and the yarn factory took a role to transform many needy peasants isolated from their farming land into laborers. In the work, many characters appear on the stage. For example, there are characters like Kim, Won Chil, Kim, Sun Dal, and Cho, Chum Ji who depended upon the land for their living, thereby representing the image of peasantry, and like brother and sister, Kim, In Dong and Kim, In Soon who had grown with strong curiosity about new things. Also, there do appear on the stage Ann, Seung Hak who while playing as the supervisor of tenant farmers, exploited farmers intermediarily and his daughter, Ann, Gab Sook who being employed at the yarn factory walked on the way of a laborer. The work begins with the appearance of a student studying in Tokyo, Kim, Hee Joon a native of 'Wonter'. He as a descendant of a ruined clan enlightens many farmers at 'Wonter' and unite them. And then, he takes an important role that leads the tenancy dispute to victory as mustering the peasants of bad years and letting them fight against Ann, Seung Hak. The novelist depicts the live, typical dispositions of the characters well linking with the historical features of those days. This indicates that the novelist had succeeded to depict the characterization of those many characters in his novel who whilst representing a group of a fixed social class or social stratum, show the live move in society, not that schematic look. Thus, it is considered that the novel, 『Gohyang』(Home Town) achieved or acquired the generality as a realistic novel meeting a great premise to create typical figures under typical situations. In this very respect, the work makes possible for it to receive such evaluation as a representative work showing the establishment of realism among many Korean modern novels.

      • 國內進出 海外프랜차이즈 加盟店의 經營成果 決定要因에 關한 硏究 : 外食産業을 中心으로

        鄭憲政 慶熙大學敎 大學院 2000 국내박사

        RANK : 248623

        Franchise business has become one of the promising business over the world. Many foreign franchise chains entered Korean market and have actively done business and especially, food service chains of them have been growing rapidly. However, though several studies on the franchise system have been conducted domestically, those on the performances of franchisee can be rarely found. Therefore, this study focused on the factors that determine the business performance of the franchisee of foreign franchise chains, and statistics of the collected questionnaire materials were compiled and analyzed with SPSS PC+ for the purpose of the objectives of the study. The several significant findings are as follows: Firstly, all the factors used in this study were shown to affect to franchisee's satisfaction on the sales. The factors that affect positively are franchisers' support for the franchisee, capability of franchisee, the characteristics of the relationship between the franchiser and the franchisee, and location of franchisee's store. The negative factor is competition of the industry. Secondly, the factors influencing significantly to franchisee's satisfaction in the sales, profitability, and overall management were shown to be franchiser's supports of marketing activities to the franchisee, franchisee's quality management, related marketing between franchiser and franchisee, and store location of franchisee. Thirdly, factors that affect significantly to the franchisee's satisfaction in the sales and overall management but profitability include franchisers' supports in the management of franchisee, franchisee's ability in the overall management and sanitation management, the managerial relationship between the franchiser and the franchisee, and competition in the industry. Fourthly, factors that affect significantly to the franchisee's satisfaction in the sales but profitability and overall management are franchisers' supports in the training and personnel management of the franchise and training ability of the franchise. Based on these findings, I may provide several suggestions: Firstly, all the factors used in this study affect positively to the franchisee's satisfaction in the sales, but not many factors of them affected significantly to the franchisee's satisfaction in all aspects. Thus, the franchisee who do business or want to start-up business in the food service franchise industry will have to take the factors affecting significantly in all aspects into considerations. That is to say, franchisee should locate his store in the best place, choose the franchiser that support actively him in the marketing activities other than else, and make every effort to enhance the relationship with the franchiser. Secondly, franchisee should focus its energies on the profitability to make a success in the long run. Growth in the sales volume without profitability may seem to expand market share in the short run, however, hamper stable management basis in the long run. Therefore, franchisee should pursue not only expansion of sales but also profitability by enhancing efficiency.

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