• 제목/요약/키워드: Stress-dependency

검색결과 204건 처리시간 0.028초

편마비 환자의 퇴원후 적응상태와 관련요인에 대한 분석적 연구 (A Study on Factors Influencing The State of Adaptation of The Hemiplegic Patients)

  • 서문자
    • 대한간호학회지
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    • 제20권1호
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    • pp.88-117
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    • 1990
  • The purposes of this study are to delineate a profile of the state of a stroke patient's adaptation at 3 months after hospitalization and to explore the relationship between the level of adaptation and the variables which influence the adaptation of hemiplegic patients. To these ends, theoretical framework was derived basically from the stress adaptation model. The basic assumption underlying the level of adaptation is influenced by the presenting focal, contextual and residual stimuli. This group of stimuli is further operationalized and represented by a perception of stress. which is the perceived effect of the disability and by the mediating variables such as sociodemographic factors as an external conditioning variables and perceived social support and hardiness personality characteristics as an internal intervening variables. The dependent varibales in this study is the level of physical, psychological and social adaptation and is hypothesized to be a function of the interaction between 3 sets of variables namely, the perceived disability effect, external conditioning variables and internal intevening varibles. A total of fourty three subjects from 3 general hospitals in Seoul were observed and interviewed with the aid of 7 structured instruments. The data were collected twice on each subject : first at the pre-discharge period arid at 3 months post-discharge from hospital for the second time. The study was carried out for the period from February to August, 1988. The instruments used for the study include 4 existing scales and 3 scales developed by the researcher for this study. They are : 1) The ADL dependency scale and the scale of the clinical physical functions for the assessment of physical adaptation. 2) the SDS(self report of depression) to measure the level of psychological adaptation. 3) The scale for the amount of social activities for the measurement of the level of social adaptation. 4) The scale for the perceived effect of disability for the measurement of the focal stimuli. 5) The health related hardiness scale and the perceived interpersonal support self evaluation list(ISEL) for the measurement of the hardiness personality character and the perceived social support. The data obtained were analyzed using percentage, oneway ANOVA, Pearson coefficients correlation and stepwise multiple regression. The findings provide valuable information about the present level of physical adaptation at 3 months after discharge. The patient revealed a decreased ADL dependency and lowered limitation of physical function as compared with pre - discharge state. Psycholcgically, the average degree of depression at follow up was within normal range of depression. Socially, the amount of social activities was very low. The one way ANOVA and the correlational analysis revealed the relationship between the 3 sets of variables and the adaptation level as follows : 1) The perceived disability effect was related to the degree of the depression and the amount of social activities but was not related to the physical adaptation. 2) Among the sociodemographic variables, sex and education were related to the difference of ADL dependency and the change of physical function. These factors indicate that women more than men and educated more than the less educated were found more independent. The education was also related to the degree of depression suggesting that the higher the educational level, the more well adapted the patients were both physically and psychologically. Age, marital status and job state were not found to be related to the patient's adaptation level. 3) Among the internal intervening variables, the health related hardiness characteristic was related to the differences of ADL dependency, physical functions and the social activities, indicating that the higher the hardiness character the higher the level of physical and social adaptation. 4) The perceived social support, another internal intervening variable, was related to the degree of depression and the social activities. This data suggest that the higher the perception of social support, the better adapted the patients were psychogically and socially. In summarizing the results of the correlational analysis, the level of physical adaptation was influenced by sex, the years of education and the hardiness character. The level of psychological adaptation was influenced by the years of education, the perceived disability effect and the perceived social support. And the level of social adaptation was influenced by the perceived disability effect, the hardiness character and the perceived social support. The stepwise multiple regression analysis shows findings as follows : 1) The most important factor to explain the difference of ADL dependency was sex, indicating females were more independent than males. 2) The most important factor to explain the difference of physical function and the degree of depression was the patient's education level. 3) The strongest explaining factor for the amount of social activities was perceived self esteem(one of the subconcepts of perceived social support). Thus the most important factors influencing the level of adaptation were found to be sex, education, the hardiness character and self esteem. From the above findings, the significance of this study can be delineated as follows : 1) Corroboration of the assumed relationship between the various variables and the adaptation level as suggested in the conceptual model. 2) Support for the feasibility of the cognitive approach for nursing intervention such as hardness character training, counselling and teaching for self-care in the chronic patients.

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충격파형 제어를 위한 펄스쉐이퍼의 동적 변형 특성에 관한 연구 (Study on the dynamic deformation characteristics of pulse shapers for controlling the shape of impact waves)

  • 양정훈;조상호;김원범;김승곤;송영수;성낙훈
    • 한국지구물리탐사학회:학술대회논문집
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    • 한국지구물리탐사학회 2009년도 학술대회 초록집
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    • pp.198-202
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    • 2009
  • 스플릿 홉킨슨 압력 봉(SHPB)실험은 암석 및 콘크리트와 같은 취성재료의 동적 물성과 변형특성을 파악하고 압축 응력-변형율 데이터를 획득하기 위하여 사용된다. SHPB 실험법은 원리상 대상시료가 파괴이전에 동적응력평형 상태와 일정 변형율 속도 조건하여 놓여져 있어야 한다. 이러한 조건을 만족시키기 위하여 충격봉과 입사봉의 충격에 의하여 발생되는 충격 입사파형을 제어할 필요가 있다. 최근에는 원형 디스크를 충격봉과 입사봉 사이에 두어 입사 충격파형을 제어하는 펄스쉐이핑 기법이 적용되고 있다. 본 연구에서는 입사 충격파형을 정밀하게 제어할 목적으로 다양한 형태와 크기의 금속디스크를 대상으로 SHPB 실험을 수행하여 동적 변형 특성을 파악하였다. 펄스쉐이퍼의 두께와 직경이 작아짐에 따라 응력값과 파장은 증가하였다.

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내적모형과 대응자원을 이용한 만성관절염 환자의 적극적 대응전략모형 (Active Coping Strategy Model for Chronic Arthritis : Appling Internal Model of World and Coping Resource)

  • 문미숙;임난영
    • 근관절건강학회지
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    • 제6권1호
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    • pp.100-135
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    • 1999
  • Typical symptoms of rheumatic disease affect overall daily living and cause severe stress. Individuals afflicted with rheumatic disease have many illness-related stresses. Pain was the predominantly perceived stress followed by limitation in mobility, difficulties in carrying out activities of daily living. helplessness, dependency on others, threat to self-esteem, interference in social activity, interference in family relationships. difficulties performing at work, and discomfort of the treatment. Patients with chronic arthritis are subjected to long periods of continuous stress, which may require the management by the health care provider. In these cases, the purpose of the nursing is helping to promote health through supporting patient's coping. Therefore, for the nursing intervention to be effective, it is critical to build a theoretical framework that describes stress-coping for chronic arthritis. Thus, the purpose of this dissertation is to present a theoretical framework which describes the stress-coping processes and to empirically test pathos of this framework for the people with chronic arthritis. The foundation upon which this framework is built in the Erickson, Tomlin, and Swain(1983) theory of Modeling and role-Modeling. The subjects were 275 patients with rheumatoid arthritis or osteoarthritis who visited the outpatient clinic. A hypothetical model of stress-coping was tested by covariance structure analysis with PC-LISREL 8.12 program. As a result, the overall fit was good(Chi-square=94.49, P=0.00, RMR=0.067, GFI=0.95, AGFI=0.91, NNFI=0.93, NFI=0.91) for the hypothetical model. The results of hypothesis testing were as follows : Basic need satisfaction had a statistically significant influence on illness-related experience, emotional stress and coping resources. Internal health locus of control had a statistically significant influence on coping resources. However, independent variables(basic need satisfaction, internal health locus of control, illness-related experience, emotional stress and coping resource) did not have significantly influence on coping. And then, the hypothetical model was modified by considering both the theoretical implication and statistical significance of the parameter estimates. The revised model had a better fit to the data(Chi-square=83.11(P=0.00), RMR=0.061, GFI=0.96, AGFI=0.92, NNFI=0.95, NFI=0.92). Hypothesis emerged from the revised model was tested. The results of hypothesis testing were as follows : Basic need satisfaction had a statistically significant influence on illness-related experience, emotional stress and coping resources. Internal health locus of control had a statistically significant influence on illness-related experience and coping resources. Internal health locus of control, illness-related experience, emotional stress and coping resources had a significantly influence on coping. According to the results of this dissertation, basic need satisfaction and internal health locus of control play a central role in appraisal of illness-related experience and coping resources. And illness related-experience, emotional stress, and coping resources affect on coping activities. In summary, nursing interventions to enhance basic need satisfaction and internal health locus of control will decrease illness related experience and emotional stress and increase coping resources. Increased coping resources will prompt coping activities.

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암석파괴 국부안전율의 특성과 응력경로 의존성 고찰 (An Investigation on the Characteristics of Local Factors of Safety of Rock Failure and Their Dependency on the Stress Paths)

  • 이연규
    • 터널과지하공간
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    • 제27권1호
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    • pp.39-49
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    • 2017
  • 다양한 암반구조물의 안전도를 정량적으로 표현하는 지수로 안전율이 흔히 사용된다. 그러므로 동일한 응력조건에서 산정된 안전율이라 할지라도 안전율의 정의에 따라 안전율 계산 값의 차이가 있을 수 있으므로 적용하는 안전율의 정의와 특성을 이해하는 것이 중요하다. 이 연구에서는 Mohr-Coulomb 파괴조건식과 Hoek-Brown 파괴조건식을 활용하여 최대전단응력, 최대전단강도, 응력불변량, 최대주응력을 기반으로 하는 4종의 국부안전율을 정의하였다. 이어서 5가지 응력경로에 따른 각 안전율의 변화특성을 고찰하였다. 암반구조물 해석시 전통적으로 많이 이용되고 있는 전단강도 기반의 국부안전율은 최대주응력 및 응력불변량 기반의 안전율에 비해 높은 안전율 값을 계산함을 보였다. 이러한 결과는 보수적 암반공학적 설계가 필요한 경우 전단강도 기반의 국부안전율보다 최대전단응력이나 응력불변량 기반의 국부안전율 도입이 필요하다는 것을 말해준다. 또한 응력경로에 따라 파괴 시 최대주응력 값도 큰 차이가 있을 수 있음을 보였다.

시멘트 시료에 대한 삼축압축 환경에서의 수압파쇄시험 연구 (Investigation of Fracture Propagation in Cement by Hydraulic Fracturing Under the Tri-axial Stress Condition)

  • 류희성;장현식;장보안
    • 지질공학
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    • 제27권3호
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    • pp.233-244
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    • 2017
  • 주입액의 점성도와 응력상태에 따른 균열전파 특성을 분석하기 위해 실험실 규모의 수압파쇄시험을 실시하였다. 시험에 사용된 시료는 시멘트 몰탈을 사용하여 제작되었으며, 각 변의 길이가 20 cm인 정육면체 형태이다. 제작된 시료는 최대강도를 갖기 위해 수중에서 약 1달간 양생과정을 거쳤다. 독립적인 가압시스템을 가지고 있는 진삼축압축장치로 시료에 압력을 가하여, 실제의 지반에서 작용하는 원위치응력 상태를 재현하였다. 시추 환경 재현을 위해 시료에 소형 시추공을 천공한 후, 일정한 주입속도로 수압파쇄시험을 실시하였다. 수압파쇄시험 과정에서 시추공에 주입된 유체의 압력을 실시간으로 측정하였으며, 동시에 미소파괴음(AE) 신호를 측정하였다. 수압파쇄시험의 모든 과정이 끝난 후 생성된 균열의 형태를 육안으로 관찰하였다. 일차파쇄압력은 주입액의 점성도 증가에 따라 지수형태를 보이며 증가하였다. 수압파쇄시험으로 인해 생성된 균열의 형태는 최대주응력과 최소주응력의 차이인 편차응력의 크기에 따라 서로 다른 양상을 보였다. 낮은 편차응력의 조건에서는 단일의 균열이 아닌 다중 균열이 생성되거나, 균열 성장과정에서 방향이 휘어지는 경향을 보였고, 이에 반해 높은 편차응력의 조건에서 생성된 균열은 단일 면상의 균열이 발생하였다. AE 분석에서도 편차응력이 클수록 미세균열이 단일 면상으로 집중되어 발생되는 경향을 보였다. 이러한 연구결과는 수압파쇄 방법을 이용한 암반파쇄에서 편차응력이 클 때보다 작을 때 더 복잡한 균열이 발생된다는 것을 보여준다. 따라서 셰일가스를 개발할 때 생산량을 높이기 위해서는 복잡한 균열을 발생시킬 수 있는 편차응력이 작은 조건에서 수압파쇄가 적용되는 것이 효과적일 것으로 판단된다.

An experimental study of scale effect on the shear behavior of rock joints

  • Lee Tae-Jin;Lee Sang-Geun;Lee Chung-In;Hwang Dae-Jin
    • 한국지구물리탐사학회:학술대회논문집
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    • 한국지구물리탐사학회 2003년도 Proceedings of the international symposium on the fusion technology
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    • pp.156-161
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    • 2003
  • Mechanical behavior of rock joints usually can be characterized by small-scale laboratory shear tests due to economical and technical limitations, but their applicability to the behaviour of rock mass has been always questioned by a number of researchers because of scale effect. Though there have been several researches regarding the scale effect, it has been a controversial problem how to apply the result of small-scale laboratory shear test directly to field design from different conclusions among researchers. In order to grasp the trend of scale effect of shear behavior, a series of direct shear tests on replicas of natural rock joint surfaces made of gypsum cement with different size and roughness were conducted and analyzed. Result showed that as the size of the specimen increased, average peak shear displacement increased, but average shear stiffness and average peak dilation angle decreased. As for the dependency of scale on shear strength, the degree of scale effect was dependent on normal stress and roughness of rock joint. For the condition of low normal stress and high roughness, decrease of average peak shear strength with increasing size of joint was evident.

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Mesoscale modelling of concrete for static and dynamic response analysis -Part 1: model development and implementation

  • Tu, Zhenguo;Lu, Yong
    • Structural Engineering and Mechanics
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    • 제37권2호
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    • pp.197-213
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    • 2011
  • Concrete is a heterogeneous material exhibiting quasi-brittle behaviour. While homogenization of concrete is commonly accepted in general engineering applications, a detailed description of the material heterogeneity using a mesoscale model becomes desirable and even necessary for problems where drastic spatial and time variation of the stress and strain is involved, for example in the analysis of local damages under impact, shock or blast load. A mesoscale model can also assist in an investigation into the underlying mechanisms affecting the bulk material behaviour under various stress conditions. Extending from existing mesoscale model studies, where use is often made of specialized codes with limited capability in the material description and numerical solutions, this paper presents a mesoscale computational model developed under a general-purpose finite element environment. The aim is to facilitate the utilization of sophisticated material descriptions (e.g., pressure and rate dependency) and advanced numerical solvers to suit a broad range of applications, including high impulsive dynamic analysis. The whole procedure encompasses a module for the generation of concrete mesoscale structure; a process for the generation of the FE mesh, considering two alternative schemes for the interface transition zone (ITZ); and the nonlinear analysis of the mesoscale FE model with an explicit time integration approach. The development of the model and various associated computational considerations are discussed in this paper (Part 1). Further numerical studies using the mesoscale model for both quasi-static and dynamic loadings will be presented in the companion paper (Part 2).

수분함량에 따른 율무가루의 점도변화 및 동적물성 특성에 관한 연구 (Viscosity and Dynamic Rheological Properties of Job's-tears as a Function of Moisture Content)

  • 윤원병;김병용;신동훈
    • 한국식품과학회지
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    • 제29권5호
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    • pp.932-938
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    • 1997
  • Changes in viscosity and dynamic theological properties of Job's-tears were measured by Bohlin dynamic tester as a function of moisture, and measurement was performed within a linear viscoelastic range. The result of the shear stress vs shear rate of Job's-tears at different moisture contents $(50{\sim}75%)$ was applied to mathematical models and Herschel-Bulkley model showed the highest correlation coefficient. Lower moisture content (55%) produced higher yield stress and consistency index, but lower flow behavior index, whereas higher moisture content showed reverse effects. Job's-tears with $50{\sim}70%$ moisture contents showed a higher storage modulus (G') than loss modulus (G') at all frequencies, showing a higher concentrated polymer characteristics. However, higher moisture content (>75%) showed crossover point between G' and G', and frequency dependency. As the moisture content was increased, the amount of viscoelastic properties such as G', G', complex viscosity decreased during heating, and initial temperature and miximum value of viscoelastic properties shifted to higher temperatures, representing the moisture-dependence of Job's-tears upon theological properties.

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대처(coping)의 개념적 구조 -혈액투석환자를 대상으로- (The Conceptual Structure of Coping -Based on Patients receiving Hemodialysis -)

  • 장성옥;이숙자;김정숙
    • 기본간호학회지
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    • 제7권1호
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    • pp.42-59
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    • 2000
  • This study was done to analyze and develop the concept of coping in patients receiving hemodialysis. The Hybrid Model of concept development was applied to develop a conceptual structure of coping in patients receiving hemodialysis, which included a field study carried out using an in-dept interview with 18 patients in the hemodialysis room of one general hospital in Seoul. Data-analysis was done in three phases as suggested by the Hybrid Model. Finally, by summarizing the results from each case, the attributes of coping, its dimensions, definition and structure were outlined. According to the results of the study, a conceptual structure of coping which centers around stressors, stress-appraisal, strategy of coping and new definitions of coping in patients receiving hemodialysis was suggested : The coping of patients receiving hemodialysis is a process that deals with physical, emotional, inter-personal, and role stress caused by hemodialysis due to renal failure. It has a series of phases which include a phase that appraises the stressful situation based on past experience of chronic disease management, one's remaining rears, the extent of family support, the extent of economic dependency, inter-personal support. education and uncertainty, and a phase of developing coping strategies that con be affected by social support and self esteem. As a result of coping, patients adapt or not to the life situation of receiving hemodialysis.

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모래지반내의 연직 지반앵커 표면의 마찰각 (Friction Angle on the Surface of Vertical Ground Anchor in Sand)

  • 임종철
    • 한국지반공학회지:지반
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    • 제11권4호
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    • pp.99-110
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    • 1995
  • 본 연구에서는 정규압밀 건조 모래 지반내의 연직 강체 지반앵커에 대한 모형 인발실험을 실시해서 앵커 표면의 마찰각을 실측했다. 마찰각은 앵커 표면의 깊이 방향으로 설치된 다수의 2 방향 로드셀을 사용해서 측정된 수직응력, 전단응력으로 구했다. 실험은 평면변형률 앵커와 축대칭 앵커에 대해서 실시했는데 실험 분석 결과, 앵커표면의 최대마찰각은 평면변형률 압축시험에 의한 무신축방향의 면상의 응력경각의 최대치와 거의 일치한다는 것을 알았다. 이 결론은 모래의 강도 이방성과 구속압 의존성 등을 고려하여 얻은 것으로 앵커 표면 마찰각에 모래의 전단저항각을 적용해서 설계하면 위험측이 된다는 것도 알 수 있다.

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