• 한국수자원학회논문집
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• 제32권2호
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• pp.143-152
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• 1999

우리나라 경북 동·남부지역은 지형조건과 원래 부족한 수자원으로 용수개발에 어려움을 겪는 지역이다. 이와 같은 물 문제를 완화시키기 위해 새로운 댐의 개발과 광역용수공급, 기존 용수공급 시스템의 조정, 오래된 댐의 개·증축 그리고 저류용댐의 건설 방안이 검토되었다. 새롭게 제시된 수자원 개발 대안의 평가는 수자원 시스템의 의사결정 도구로 많이 이용되고 있는 수학적 모형의 하나인 네트워크 최적화 모형을 이용하였다. 연구결과 용수공급 시스템이 2011년까지 건설된다면 포항 및 경주권의 용수공급 신뢰도는 95% 이상을 확보할 수 있을 것으로 분석되었으며 네트워크 최적화 모형이 수리권 혹은 용수공급 우선 순위를 고려한 수자원 시설물의 운영을 분석하는데 사용 될 수 있을 것으로 판단된다.

• 대한의용생체공학회:의공학회지
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• 제29권2호
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• pp.139-145
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• 2008

Many recent studies suggest that the posterior dynamic stabilization(PDS) can be a more physiologically-relevant alternative to the rigid fixation for the patients suffering from low back pain. However, its biomechanical effects or clinically proven efficacies still remain unknown. In this study, we evaluated kinematic behaviors of the lower lumbar spine with the PDS system and then compared to those of the rigid fixation system using finite element (FE) analysis. A validated FE model of intact lumbar spine(L2-L5) was developed. The implanted model was then constructed after modification from the intact to simulate two kinds of pedicle screw systems (PDS and the rigid fixation). Hybrid protocol was used to flex, extend, laterally bend and axially rotate the FE model. Results showed that the PDS systems are more flexible than rigid fixation systems, yet not flexible enough to preserve motion. PDS system allowed $16.2{\sim}42.2%$ more intersegmental rotation than the rigid fixation at the implanted level. One the other hand, at the adjacent level it allowed more range of motion ($2.0%{\sim}8.3%$) than the rigid fixation. The center of rotation of the PDS model remained closer to that of the intact spine. These results suggest that the PDS system could be able to prevent excessive motion at the adjacent levels and restore the spinal kinematics.

• Membrane and Water Treatment
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• 제9권6호
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• pp.421-434
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• 2018

Decision-makers have different and sometimes conflicting goals with utilities in operating dam reservoirs. As repeated interactions exist between decision-makers in the long-term, and the utility of each decision-making organization is affected not only by its selected strategy, but also by other rivals' strategies; selecting and prioritizing optimum strategies from a decision maker's point of view are of great importance while interacting with others. In this paper, a model based on a fuzzy set theory, for determining the priority of decision-makers' strategies in optimal qualitative-quantitative operation management of dam reservoir is presented. The fuzzy priority matrix is developed via defining membership functions of a fuzzy set for each decision maker's strategies, so that all uncertainties are taken into account. This matrix includes priorities assigned to possible combination for other decision makers' strategies in bargaining with each player's viewpoint. Here, the 15-Khordad Dam located in the central part of Iran, suffering from low water quality, was studied in order to evaluate the effectiveness of the model. Then, the range of quality of water withdrawal agreed by all decision-makers was determined using the prioritization matrix based on fuzzy logic. The results showed that the model proposed in the study had high effectiveness model.

• The Korean Journal of Physiology and Pharmacology
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• 제21권2호
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• pp.153-160
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• 2017

In this study, we aim to determine the in vivo effect of human umbilical cord blood-derived multipotent stem cells (hUCB-MSCs) on neuropathic pain, using three, principal peripheral neuropathic pain models. Four weeks after hUCB-MSC transplantation, we observed significant antinociceptive effect in hUCB-MSC-transplanted rats compared to that in the vehicle-treated control. Spinal cord cells positive for c-fos, CGRP, p-ERK, p-p 38, MMP-9 and MMP 2 were significantly decreased in only CCI model of hUCB-MSCs-grafted rats, while spinal cord cells positive for CGRP, p-ERK and MMP-2 significantly decreased in SNL model of hUCB-MSCs-grafted rats and spinal cord cells positive for CGRP and MMP-2 significantly decreased in SNI model of hUCB-MSCs-grafted rats, compared to the control 4 weeks or 8weeks after transplantation (p<0.05). However, cells positive for TIMP-2, an endogenous tissue inhibitor of MMP-2, were significantly increased in SNL and SNI models of hUCB-MSCs-grafted rats. Taken together, subcutaneous injection of hUCB-MSCs may have an antinociceptive effect via modulation of pain signaling during pain signal processing within the nervous system, especially for CCI model. Thus, subcutaneous administration of hUCB-MSCs might be beneficial for improving those patients suffering from neuropathic pain by decreasing neuropathic pain activation factors, while increasing neuropathic pain inhibition factor.

• 한국전자거래학회지
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• 제16권4호
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• pp.17-31
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• 2011

정보화의 빠른 진전과 더불어 정보화의 역기능 역시 비례하여 확산되고 있으며 그 피해는 막대한 것으로 추정되고 있다. 하지만 현재까지 개인정보 유출의 피해규모에 대한 연구와 자료가 미흡한 실정이기 때문에 이로 인한 국가적 피해규모를 계량화하는 작업에 많은 현실적 어려움이 존재하고 있다. 만약 피해액의 규모를 제대로 산출하여 보안정책 수립에 참고한다면 경제적으로나 사회적으로 미치는 사고 영향의 심각성을 정확히 파악할 수 있으며, 결과적으로 유출사고 대응에 필요한 기업 그리고 정부의 노력과 비용의 크기~에 대한 의사결정을 할 수 있기 때문에 체계적인 경제적 피해규모를 파악하는 일은 매우 필요한 과제라고 판단된다. 이에 본 연구는 일본 네트워크 보안협회 등 해외 유수 연구들의 방법론과 새로운 접근법들을 참고하여, 개인정보 유출사고의 피해실태를 파악하기 위한 정보의 수집과 이의 정량적 분석의 개념적 틀을 제시하고자 한다. 또한 비교적 데이터가 부족한 국내의 환경에서도 정책적 지표로서 의미 있는 피해액을 측정함으로써 개인정보 유출 피해를 막기 위한 다양한 정책기획의 기반자료로 활용될 수 있기를 기대한다.

• 대한간호학회지
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• 제28권2호
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• pp.270-279
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• 1998

Since death is an extremely subjective and unique experience, if we take into account the lack of understanding about death due to the difficulty in methodology, it is very important to try to understand the subjectivity of death. In this respect, Q-methodology that explains and shows the respondent's subjectivity by objectifying his subjectivity is employed as a solution to the questions in this study. Therefore, the purpose of this study was to provide data on how medical personnel should treat their patients, when it comes to death : by finding out the opinions of those who are being treated, namely the patients, and those who are providing the treatment, namely the medical personnel. It also by examined the characteristics and relationships between these two groups on attitudes to death. The results of this study show that medical per sonnel have two(fate-receipient, reality-oriented) types of response and patients have three (religion-dependent, science-adherent, sardonist) types. Medical personnel saw patients as having three (life-attached. traditionalist, death-rejector) types of response and to patients saw medical personnel as having two (rationalist, humanist)types. The relationship between the above-mentioned types will be examined in a coorientation model, the subjectivity of the medical personnel and the patient toward death indicates a relatively high understanding between the two groups under the great proposition of 'death'. Therefore, in their relationship with people who are facing death, the provider of care, namely the medical personnel, should identify the subjectivity of the patient before approaching them. By doing this, they can minimize the conflicts they might experience in establishing a therapeutic relationship, reduce suffering, and help the patient in greeting a more comfortable death. Throughout the study, Q-methodology expands our understanding of coorientation model that has only been approached with R-methodology. This study confirmed Q's potentiality and its validity in human subjective matters.

• Journal of Preventive Medicine and Public Health
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• 제52권2호
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• pp.140-144
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• 2019

Objectives: Investigating the survival of patients with cancer is vitally necessary for controlling the disease and for assessing treatment methods. This study aimed to compare various statistical models of survival and to determine the survival rate and its related factors among patients suffering from lung cancer. Methods: In this retrospective cohort, the cumulative survival rate, median survival time, and factors associated with the survival of lung cancer patients were estimated using Cox, Weibull, exponential, and Gompertz regression models. Kaplan-Meier tables and the log-rank test were also used to analyze the survival of patients in different subgroups. Results: Of 102 patients with lung cancer, 74.5% were male. During the follow-up period, 80.4% died. The incidence rate of death among patients was estimated as 3.9 (95% confidence [CI], 3.1 to 4.8) per 100 person-months. The 5-year survival rate for all patients, males, females, patients with non-small cell lung carcinoma (NSCLC), and patients with small cell lung carcinoma (SCLC) was 17%, 13%, 29%, 21%, and 0%, respectively. The median survival time for all patients, males, females, those with NSCLC, and those with SCLC was 12.7 months, 12.0 months, 16.0 months, 16.0 months, and 6.0 months, respectively. Multivariate analyses indicated that the hazard ratios (95% CIs) for male sex, age, and SCLC were 0.56 (0.33 to 0.93), 1.03 (1.01 to 1.05), and 2.91 (1.71 to 4.95), respectively. Conclusions: Our results showed that the exponential model was the most precise. This model identified age, sex, and type of cancer as factors that predicted survival in patients with lung cancer.

• 대한교통학회지
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• 제34권1호
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• pp.55-67
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• 2016

이 연구의 목적은 도시철도의 서비스품질과 고객만족도, 재이용의도 간 상관관계와 인과관계를 분석하는 것이다. 구조방정식모형(SEM)을 설정한 후 그것을 분석하기 위하여 SPSS 21.0과 AMOS 21.0을 사용하였다. 분석의 결과 대부분 모형의 적합도를 만족시켰다: 서비스품질의 신뢰성과 편리성, 안전성은 고객만족도에 유의한 정(+)의 영향을 미쳤고(p<.05), 유형성(-.187)과 응대성(-.103)은 고객만족도에 영향력의 크기와는 관련이 없는 것으로 분석되었다(p>.05). 그리고 고객만족도는 재방문의도에 유의한 정(+)의 영향을 미치는 것으로 분석되었다(p<.001). 고객만족도에 영향을 주는 중요도의 서비스품질의 우선순위는 신뢰성, 편리성, 안전성, 응대성, 유형성 순으로 나타났다. 이 연구의 결과는 향후 만성적인 적자로 허덕이고 있는 도시철도(경전철포함) 운영기관에게 고객맞춤형 서비스품질을 제공토록 하여 고객만족도 향상과 수익창출 위한 중장기 경영계획과 경영전략의 초석을 제공할 것이다.

• 서비스연구
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• 제8권1호
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• pp.1-12
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• 2018

본 연구는 지혜자산을 구축하고 유통하고 활용하는 전체 과정이 최적의 서비스시스템이 되도록 서비스디자인 모델을 연구하였다. 지혜의 본질을 분석하고, 지혜와 서비스의 본질에 기반하여 지혜자산화서비스모델을 디자인하였다. 지혜와 서비스 본질에의 충실성에 시스템 최적성을 기반을 두고 연구를 수행하였다. 지혜의 근본성과 연결성, 서비스의 관계성, 수평성, 쌍방향성, 조화성 본질을 서비스디자인에 반영하였다. 지혜자산화 서비스시스템은 이들 본질적 특성에 충실하게 설계될 때, 시스템구축 목적과 운영 과정이 최선의 상태로 구현될 수 있음을 제시하였다. 지혜원천 채집, 지혜 가공, 지혜 유통, 지혜 활용, 지혜 전수, 서비스 운영 등의 전체서비스에 대해 서비스 기본 모델을 디자인한 후, 세부 서비스모델을 제시하였다. 지혜자산 구축서비스, 지혜자산 활용서비스, 서비스경영 등 세 개의 축으로 세부 서비스 모델을 디자인하였다. 본 연구는 정신적으로 피폐해가는 물질문명 사회의 문제점을 해결하고 생산성이 높으면서도 정신적으로 건강한 사회를 위한 서비스모델을 설계하는 차원에서 수행되었다. 본 연구에서 제안된 서비스디자인을 보완하고 세부 모델을 상세히 디자인하고, 각 디자인을 심화시키는 후속 연구가 필요하다.

• 근관절건강학회지
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• 제8권1호
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• pp.5-26
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• 2001

Many studies have reported that regular aquatic exercise can lead to improvement of health for patients suffering from arthritis. In spite of these benefits, the adherence rate has shown as few as 26% of patients with arthritis who had completed the aquatic exercise education program. Moreover, when patients with arthritis begin an aquatic exercise, 47% withdraw within the first 6 month. No study has been found that constructs model to explain aquatic exercise adherence of patients with arthritis. The purpose of this study were to identify the factors influencing exercise adherence and to construct and test a structural model to explain aquatic exercise adherence of patients with arthritis. Hypothesized model was constructed on the basis of Bandura's social cognitive theory and literature review. Exogenous latent variables included in this model are group cohesion and barrier, endogenous latent variables are self-efficacy, outcome expectancy and self-evaluation. Empirical data used was collected through individual interviews with the structural questionnaire on 249 patients with arthritis who had completed the 6-week aquatic exercise education program of Korean Rheumatology Health Professionals Academy. The interviews were performed from September 6, 1999 through October 8, 1999. A model tested by the covariance structural analysis with LISREL 8.12a program and by descriptive statistics and correlation with SAS 6.12 program. The results are summarized as follows: First, hypothesized model showed a good fit to the empirical data. In the modified model added one new path showed a much better fit. Second, group cohesion had a direct, indirect positive effects, self-efficacy and self evaluation had a direct positive effects on exercise adherence. Barrier had a direct, indirect negative effects on exercise adherence. Outcome expectancy had a direct negative effect, indirect positive effects through self-evaluation on exercise adherence, but total effects was not significant. Total effect size of the variables were group cohesion, self-efficacy, barrier and self evaluation in order. All variables accounted for 54% of the total variance of exercise adherence in the model. In conclusion, this model confirmed to be proper in explaining of aquatic exercise adherence. Group cohesion, self-efficacy, outcome expectancy, self-evaluation, barrier contributed to the aquatic exercise adherence of patients with arthritis. The results of this study suggested that improvement of group cohesion, self-efficacy and self-evaluation, motivation of outcome expectancy through self-evaluation, and reduction of the barrier should be included in the strategy of nursing intervention for the aquatic exercise adherence of patients with arthritis.