• Title, Summary, Keyword: Prognosis

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A Study on Feasibility Evaluation for Prognosis Systems based on an Empirical Model in Nuclear Power Plants

  • Lee, Soo Ill
    • International Journal of Safety
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    • v.11 no.1
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    • pp.26-32
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    • 2012
  • This paper introduces a feasibility evaluation method for prognosis systems based on an empirical model in nuclear power plants. By exploiting the dynamical signature characterized by abnormal phenomena, the prognosis technique can be applied to detect the plant abnormal states prior to an unexpected plant trip. Early $operator^{\circ}{\emptyset}s$ awareness can extend available time for operation action; therefore, unexpected plant trip and time-consuming maintenance can be reduced. For the practical application in nuclear power plant, it is important not only to enhance the advantages of prognosis systems, but also to quantify the negative impact in prognosis, e.g., uncertainty. In order to apply these prognosis systems to real nuclear power plants, it is necessary to conduct a feasibility evaluation; the evaluation consists of 4 steps (: the development of an evaluation method, the development of selection criteria for the abnormal state, acquisition and signal processing, and an evaluation experiment). In this paper, we introduce the feasibility evaluation method and propose further study points for applying prognosis systems from KHNP's experiences in testing some prognosis technologies available in the market.

Iranian Cancer Patient Perceptions of Prognosis and the Relationship to Hope

  • Seyedrasooli, Alehe;Rahmani, Azad;Howard, Fuchsia;Zamanzadeh, Vahid;Mohammadpoorasl, Asghar;Aliashrafi, Raha;Pakpour, Vahid
    • Asian Pacific Journal of Cancer Prevention
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    • v.15 no.15
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    • pp.6205-6210
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    • 2014
  • Background: The aim of this study was to investigate Iranian cancer patient perceptions of their prognosis, factors that influence perceptions of prognosis and the effect this has on patient level of hope. Materials and Methods: Iranian cancer patients (n=200) completed self-report measures of their perceptions of their prognosis and level of hope, in order to assess the relationship between the two and identify factors predictive of perceptions by multiple linear regression analysis. Results: Cancer patients perceived of their prognosis positively (mean 11.4 out of 15), believed their disease to be curable, and reported high levels of hope (mean 40.4 out of 48.0). Multiple linear regression analyses demonstrated that participants who were younger, perceived they had greater family support, and had higher levels of hope reported more positive perceptions of their cancer prognosis. Conclusions: Positive perceptions of prognosis and its positive correlation with hope in Iranian cancer patients highlights the importance of cultural issues in the disclosure of cancer related information.

FACTORS AFFECTING 6 MONTHS' SHORT-TERM PROGNOSIS OF CONDUCT DISORDER IN THE ADOLESCENTS II -RELATION TO DEPRESSION/ANXIETY AND ADHD INVENTORY- (청소년 품행장애의 6개월 단기 예후에 영향을 미치는 변인 II - 우울 및 불안척도와 주의력결핍 과잉활동 척도를 중심으로 -)

  • Bang, Yang-Won;Chae, Jeong-Ho;Chin, Tae-Won;Lee, Chung-Kyoon
    • Journal of the Korean Academy of Child and Adolescent Psychiatry
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    • v.7 no.2
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    • pp.161-166
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    • 1996
  • The major goals of this study are to investigate the correlation between the cormorbid symptom and the prognosis of conduct disorder in the adolescents. for this purpose, according to the result of 6-month follow-up of discharged patient who met the criteria of conduct disorder in admission, good-prognosis group(n=37) and poor-prognosis group(n=36) were selected. Authors applied Children's Depression Inventory and Trait Anxiety Inventory, Conners Parenting Rating Scale. Yale Children's Inventory to two groups. The results are summarized as follows : 1) Using CDI, the mean scores of poor-prognosis group were significantly higher compared with those of good prognosis group. 2) Using TAI, CPRS, YCI, the mean scores of poor-prognosis group were insignificantly higher compared with those of good prognosis. 3) The limitation of our study is that number of subjects is small, definition of prognosis is ambiguous, and period of 6 month follow-up is short.

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On-line Motion Planner for Multi-Agents based on Real-Time Collision Prognosis

  • Ji, Sang-Hoon;Kim, Ji-Min;Lee, Beom-Hee
    • 제어로봇시스템학회:학술대회논문집
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    • pp.74-79
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    • 2005
  • In this paper, we propose a novel approach to decentralized motion planning and conflict-resolution for multiple mobile agents working in an environment with unexpected moving obstacles. Our proposed motion planner has two characteristics. One is a real-time collision prognosis based on modified collision map. Collision map is a famous centralized motion planner with low computation load, and the collision prognosis hands over these characteristics. And the collision prognosis is based on current robots status, maximum robot speeds, maximum robot accelerations, and path information produced from off-line path planning procedure, so it is applicable to motion planner for multiple agents in a dynamic environment. The other characteristic is that motion controller architecture is based on potential field method, which is capable of integrating robot guidance to the goals with collision avoidance. For the architecture, we define virtual obstacles making delay time for collision avoidance from the real-time collision prognosis. Finally the results obtained from realistic simulation of a multi-robot environment with unknown moving obstacles demonstrate safety and efficiency of the proposed method.

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Analysis of Prognostic Factors in Malignant External Otitis

  • Lee, Sang Kuk;Lee, Se A;Seon, Sang Woo;Jung, Jae Hyun;Lee, Jong Dae;Choi, Jae Young;Kim, Bo Gyung
    • Clinical and Experimental Otorhinolaryngology
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    • v.10 no.3
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    • pp.228-235
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    • 2017
  • Objectives. Malignant external otitis (MEO) is a potentially fatal infection of the external auditory canal, temporal bone, and skull base. Despite treatment with modern antibiotics, MEO can lead to skull base osteomyelitis. Until now, there have been few studies on the prognostic factors of MEO. Methods. We performed a retrospective study to identify prognostic factors of MEO, and a meta-analysis of other articles investigating MEO. On the basis of disease progression the 28 patients in our study were divided into 'controlled' and 'uncontrolled' groups, consisting of 12 and 16 patients, respectively. We identified three categories of prognostic factors: those related to patient, disease, and treatment. We compared these prognostic factors between the controlled and uncontrolled groups. Results. In our study, the duration of diabetes mellitus (DM), presence of inflammatory markers (C-reactive protein and erythrocyte sedimentation rate), and computed tomography or magnetic resonance imaging findings influenced the prognosis of MEO. In contrast, prognosis was unrelated to age, gender, mean glucose level, hemoglobin A1c level, pathogen, comorbidity, or cranial nerve involvement. No factor related to treatment modality was correlated with prognosis, such as surgery, steroid therapy, or interval to the first appropriate treatment. Cranial nerve involvement has been proven to be associated with disease progression, but the relationship between cranial nerve involvement and the prognosis of MEO remains controversial. As a part of this study, we conducted a meta-analysis of cranial nerve involvement as a prognostic factor of MEO. We found that cranial nerve involvement has a statistically significant influence on the prognosis of MEO. Conclusion. We found that glycemic control in diabetes mellitus, cranial nerve involvement, and the extent of disease determined from various imaging modalities influence the prognosis of MEO. We suggest that significant prognostic factors should be monitored to determine the prognosis of patients with MEO.

Machine Fault Diagnosis and Prognosis: The State of The Art

  • Tung, Tran Van;Yang, Bo-Suk
    • International Journal of Fluid Machinery and Systems
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    • v.2 no.1
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    • pp.61-71
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    • 2009
  • Machine fault diagnostic and prognostic techniques have been the considerable subjects of condition-based maintenance system in the recent time due to the potential advantages that could be gained from reducing downtime, decreasing maintenance costs, and increasing machine availability. For the past few years, research on machine fault diagnosis and prognosis has been developing rapidly. These publications covered in the wide range of statistical approaches to model-based approaches. With the aim of synthesizing and providing the information of these researches for researcher's community, this paper attempts to summarize and classify the recent published techniques in diagnosis and prognosis of rotating machinery. Furthermore, it also discusses the opportunities as well as the challenges for conducting advance research in the field of machine prognosis.

Data-driven approach to machine condition prognosis using least square regression trees

  • Tran, Van Tung;Yang, Bo-Suk;Oh, Myung-Suck
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.886-890
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    • 2007
  • Machine fault prognosis techniques have been considered profoundly in the recent time due to their profit for reducing unexpected faults or unscheduled maintenance. With those techniques, the working conditions of components, the trending of fault propagation, and the time-to-failure are forecasted precisely before they reach the failure thresholds. In this work, we propose an approach of Least Square Regression Tree (LSRT), which is an extension of the Classification and Regression Tree (CART), in association with one-step-ahead prediction of time-series forecasting technique to predict the future conditions of machines. In this technique, the number of available observations is firstly determined by using Cao's method and LSRT is employed as prognosis system in the next step. The proposed approach is evaluated by real data of low methane compressor. Furthermore, the comparison between the predicted results of CART and LSRT are carried out to prove the accuracy. The predicted results show that LSRT offers a potential for machine condition prognosis.

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Analysis of Prognosis Graphs in Korean Medicine (그래프 기반 한의 예후 분석 - 팔강육음, 기혈진액, 장부 변증을 중심으로 -)

  • Kim, Sang-Kyun;Kim, An Na
    • Journal of Physiology & Pathology in Korean Medicine
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    • v.26 no.6
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    • pp.818-822
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    • 2012
  • We in this paper propose a prognosis graph, analyzing prognoses of each pattern described in the Korean medicine literatures. This graph is represented as the integrated graphs about knowledge of patterns and their transitions in the prognoses, where a node becomes a pattern name and a edge becomes a transition between patterns, along with a condition with respect to cause or mechanism of the pattern. The knowledge of prognoses which a pattern is transit into another pattern can be identified at a glance by using this model. We also construct a upper-level prognosis graph, excluding five viscera and six entrails from the model. This upper-level prognosis graph contains the conceptual knowledge than clinical one so that it may be helpful to students and researchers in the Korean medicine fields.

Down-regulated MYH11 Expression Correlates with Poor Prognosis in Stage II and III Colorectal Cancer

  • Wang, Ren-Jie;Wu, Peng;Cai, Guo-Xiang;Wang, Zhi-Min;Xu, Ye;Peng, Jun-Jie;Sheng, Wei-Qi;Lu, Hong-Fen;Cai, San-Jun
    • Asian Pacific Journal of Cancer Prevention
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    • v.15 no.17
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    • pp.7223-7228
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    • 2014
  • The MYH11 gene may be related to cell migration and adhesion, intracellular transport, and signal transduction. However, its relationship with prognosis is still uncertain. The aim of this study was to investigate correlations between MYH11 gene expression and prognosis in 58 patients with stage II and III colorectal cancer. Quantitative real-time polymerase chain reaction was performed in fresh CRC tissues to examine mRNA expression, and immunohistochemistry was performed with paraffin-embedded specimens for protein expression. On univariate analysis, MYH11 expression at both mRNA and protein levels, perineural invasion and lymphovascular invasion were related to disease-free survival (p<0.05; log-rank test). Cancers with lower MYH11 expression were more likely to have a poor prognosis. Otherwise, MYH11 expression was unrelated to patient clinicopathological features. On multivariate analysis, low MYH11 expression proved to be an independent adverse prognosticator (p<0.05). These findings show that MYH11 can contribute to predicting prognosis in stage II and III colorectal cancers.

The Clinical observation of acute Bell's palsy 80 Case (급성기 안면마비 (Bell's palsy) 환자의 예후 및 치료율에 대한 임상고찰 80례)

  • Won, Jae-Sun;Chou, Ching-Yu;Cho, Ah-Reum;Kim, Ji-Hyun;Kim, Chang-Hwan
    • The Journal of Korean Medicine Ophthalmology and Otolaryngology and Dermatology
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    • v.23 no.2
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    • pp.151-162
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    • 2010
  • Objective : Bell's palsy is common and has many clinic study. but bell's palsy prognosis is not enough specific. So this study was evaluated bell's palsy prognosis, treatment number, sequela of normal group and bad prognosis group. Methods : From June 2009 to June 2010, patients who visited Dong-seo Oriental Medicine ENT. A clinic study was done on patient who were diagnosed bell's palsy, onset 2weeks within when first visited OPD and treated 3 times over in Dong-seo Oriental Medicine Cental. To evaluate grade of paralysis, House-Brackman Scale was used. We classified treatment numbers of each HB-Scale group, normal gIVroup and bad prognosis group. Results : The distribution of Onset HB-Scale : Gr II 26.25%, Gr III 67.5%, Gr IV 6.25% Onset HB-Scale Gr II patients completely recover 100% Onset HB-Scale Gr III patients completely recover 64.8%, improved 27.8%, nothing change 7.4% Onset HB-Scale Gr IV patients completely recover 40%, improved 60% Onset HB-Scale Gr II & IV patients recovery percentage make no difference of normal group (Group A) and bad prognosis. Onset HB-Scale Gr III patients completely recover Group A 66.7%, Group B 52.9%, improved Group A 23.2%, Group 35.3%, noting change Group A 5.1%, Group B 11.8% Onset HB-Scale Gr II patients has no sequela. Onset HB-Scale Gr III & IV patients has tendency that they treat more times, more improving and less sequela probability Conclusion : Onset HB-Scale is the indicator of acute bell's palsy prognosis.