• Title/Summary/Keyword: Problem life cycle

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A Study on the Problems in the Consumption Life of Household Over Family Life Cycle (가족생활주기에 따른 가계의 소비생활문제에 관한 연구)

  • 홍향숙;이기춘
    • Journal of Families and Better Life
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    • v.7 no.1
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    • pp.1-14
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    • 1989
  • The purpose of this study was to identify the problems in the consumption life of household over the family life cycle so that they would support to select the consumer education subjects and the establish the long-term household plan. For these purposes, a survey was conducted using questionnaire. The data used in this study included 562 homemakers living in Seoul. Statistics used for data analysis were frequency distribution, Mean, Percentile, One-way Anova, Scheffie-test, Multiple Classification Analysis. Major findings were as follows; 1) In the level of the problems in the consumption life of household, housing problem, durable goods problem, healthy-medical problem and child education problem area were in the low level. Leisure problem and properties management problem area were in the high level. 2) The problems in the consumption life of household differed significantly over the family life cycle. 3) When controlling family monthly income and education level of husband was compared with not-controlling them, the influences of family life cycle on the problems in the consumption life were as follows. (1)At housing problem area, the effect of the FLC was higher in controlling them than not-controlling them. (2) At other problems the effects of the FLC was lower or same in controlling them than not-controlling them.

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The Life Cycle of the Rendezvous Problem of Cognitive Radio Ad Hoc Networks: A Survey

  • Htike, Zaw;Hong, Choong Seon;Lee, Sungwon
    • Journal of Computing Science and Engineering
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    • v.7 no.2
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    • pp.81-88
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    • 2013
  • In cognitive radio or dynamic spectrum access networks, a rendezvous represents meeting two or more users on a common channel, and negotiating to establish data communication. The rendezvous problem is one of the most challenging tasks in cognitive radio ad hoc networks. Generally, this problem is simplified by using two well-known mechanisms: the first uses a predefined common control channel, while the second employs a channel hopping procedure. Yet, these two mechanisms form a life cycle, when they simplify the rendezvous problem in cognitive radio networks. The main purpose of this paper is to point out how and why this cycle forms.

Factors Influencing Problem Drinking of Male Drinkers according to Life Cycle (생애주기별 남성 음주자의 문제음주 영향요인에 관한 연구)

  • Hong, Jiyeon;Kim, Jihyun;Kim, Oksoo
    • Korean Journal of Adult Nursing
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    • v.26 no.2
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    • pp.139-148
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    • 2014
  • Purpose: This study was aimed to investigate the factors influencing problem drinking of male drinkers above 19 years old according to the life cycle. Methods: The study subjects consisted of a representative community sample of 2,229 male drinkers aged 19 and older from the 2011 Korean National Health and Nutrition Examination Survey. The collected data were analyzed using descriptive statistics, Rao-Scott $x^2$-test, simple and multiple logistic regressions. Results: The problem drinking rates were 38.7% in adolescence, 44.5% in middle age, and 23.9% in senescence. In adolescence, the predictors of problem drinking included occupation, stress recognition, and smoking. In middle age, the predictors of problem drinking were education level, depression, and smoking. In senescence, the predictors of problem drinking were not identified in this study. Conclusion: The findings of this study suggested that the factors influencing problem drinking of male drinkers were different according to life cycle. Thus different intervention methods should be developed for each age group in order to intervene the problem drinking.

Problems with Bone Health and the Influencing Factors of Bone Mineral Density in Women across the Life Cycle (여성의 생애주기별 골건강 문제 및 골밀도 영향요인: 2010년 국민건강영양조사 자료 이용)

  • Chun, Nami;Chae, Hyunj
    • Women's Health Nursing
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    • v.21 no.1
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    • pp.43-54
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    • 2015
  • Purpose: This study was conducted to identify the problem of bone health and potential influencing factors of bone mineral density (BMD) for women across the life cycle of menopause. Methods: Complex sampling design data analysis was performed on the fifth Korea National Health and Nutrition Examination Survey 2010 in order to identify the problems with bone health, BMD and its influencing factors in 3,499 women who answered the menopausal status. Women's life cycle was categorized by premenopausal, postmenopausal, and elderly. Results: 35.1% of premenopausal women, 73.3% of postmenopausal women, and 96.0% of elderly women had problems with bone health that were related to low BMD. Influencing factors of BMD were residential area, alcohol drinking, and body mass index (BMI) for premenopausal women; age, residential area, education, marital status, income, and BMI for postmenopausal women; and age, education, and BMI for elderly women. Conclusion: Problems with bone health required to be considered as a major health problem in all women regardless their life cycle. Interventions to maximize BMD need to be developed by considering its influencingfactors across the women's life cycle.

Optimum Life Cycle Cost Design of Steel Box Girder Bridges (강상형교의 최적 Life Cycle Cost 설계)

  • 조효남;민대홍;김구선
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 1998.10a
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    • pp.151-158
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    • 1998
  • This paper presents an optimal decision model for minimizing the life-cycle cost of steel box girder bridges. The point is that it takes into account service life process as a whole, and the life-cycle costs include initial (design, testing, and construction) costs, maintenance costs and expected failure costs. The problem is formulated as that of minimization of expected total life-cycle cost with respect to the design variables. The optimal solution identifies those values of the decision variables that result in minimum expected total cost. The performance constraints in the form of flexural failure and shear failure are those specified in the design code. Based on extensive numerical investigations, it may be positively stated that the optimum design of steel box girder bridges based on life-cycle cost approach proposed in this study provides a lot more rational and economical design, and thus the proposed approach will propose the development of new concepts and design methodologies that may have important implications in the next generation performance-based design codes and standards.

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An Analysis of Consumer Portfolio according to Family Life Cycle (가정생활주기에 따른 소비자포트폴리오 분석)

  • 최현자
    • Journal of Families and Better Life
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    • v.16 no.3
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    • pp.111-122
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    • 1998
  • This study analyzed the copmposition of household portfolio over the family life cycle using a survey dta of 1996 Korea Household Panel Study. The finindings showed that over th family life cycle households diversified their portfolio to meet their financial needs. In the aged stage however households were more likely to have liquidity problem than the households in th other stages due to the estate concentrated portfoplio composition.

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Optimum Service Life Management Based on Probabilistic Life-Cycle Cost-Benefit Analysis (확률론적 생애주기비용-이익분석 기반 수명관리 최적화 기법)

  • Kim, Sunyong
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.17 no.4
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    • pp.19-25
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    • 2016
  • Engineering structures including civil infrastructures require a life-cycle cost and benefit during their service lives. The service life of a structure can be extended through appropriate inspection and maintenance actions. In general, this service life extension requires more life-cycle cost and cumulative benefit. For this reason, structure managers need to make a rational decision regarding the service life management considering both the cost and benefit simultaneously. In this paper, the probabilistic decision tool to determine the optimal service life based on cost-benefit analysis is presented. This decision tool requires an estimation of the time-dependent effective cost-benefit under uncertainty to formulate the optimization problem. The effective cost-benefit is expressed by the difference between the cumulative benefit and life-cycle cost of a deteriorating structure over time. The objective of the optimization problem is maximizing the effective cost-benefit, and the associated solutions are the optimal service life and maintenance interventions. The decision tool presented in this paper can be applied to any deteriorating engineering structure.

A Study on Improving the Precision of Quantitative Prediction of Cold Forging Die Life Cycle Through Real Time Forging Load Measurement (실시간 성형하중 계측을 통한 냉간단조 금형수명 정량예측 정밀도 향상 연구)

  • Seo, Y.H.
    • Transactions of Materials Processing
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    • v.30 no.4
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    • pp.172-178
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    • 2021
  • The cold forging process induces material deformation in an enclosed space, generating a very high forging load. Therefore, it is mainly designed as a multi-stage process, and fatigue failure occurs in forging die due to cyclic load. Studies have been conducted previously to quantitatively predict the fatigue limit of cold forging dies, however, there was a limit to field application due to the large error range and the need for expert intervention. To solve this problem, we conducted a study on the introduction of a real-time forging load measurement technology and an automated system for quantitative prediction of die life cycle. As a result, it was possible to reduce the error range of the quantitative prediction of die life cycle to within ±7%, and it became possible to use the die life cycle calculation algorithm into an automated system.

A Study on Modeling of Life Cycle Cost for Magnetic Levitation Train (자기부상열차 시스템의 수명주기비용 모델링에 관한 연구)

  • Lee, Yun-Seong;Kim, Jin-O;Kim, Hyung-Chul;Jang, Dong-Uk
    • Journal of the Korean Society for Railway
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    • v.12 no.6
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    • pp.1076-1080
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    • 2009
  • An analysis of Life Cycle Cost (LCC) is to evaluate the system through the total cost accounting during the total life cycle. Railway system has problem that abundant capital has to be utilized efficiently because railway system is a combined system such as power supply, machines, electric signals. Especially, Magnetic Levitation Train needs high technique and more study about the Life Cycle cost by using the system being developed currently in Korea. Therefore, the Modeling of Life Cycle Cost for Magnetic Levitation Train is proposed considering the tendency of the studies in other countries.

Deep reinforcement learning for optimal life-cycle management of deteriorating regional bridges using double-deep Q-networks

  • Xiaoming, Lei;You, Dong
    • Smart Structures and Systems
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    • v.30 no.6
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    • pp.571-582
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    • 2022
  • Optimal life-cycle management is a challenging issue for deteriorating regional bridges. Due to the complexity of regional bridge structural conditions and a large number of inspection and maintenance actions, decision-makers generally choose traditional passive management strategies. They are less efficiency and cost-effectiveness. This paper suggests a deep reinforcement learning framework employing double-deep Q-networks (DDQNs) to improve the life-cycle management of deteriorating regional bridges to tackle these problems. It could produce optimal maintenance plans considering restrictions to maximize maintenance cost-effectiveness to the greatest extent possible. DDQNs method could handle the problem of the overestimation of Q-values in the Nature DQNs. This study also identifies regional bridge deterioration characteristics and the consequence of scheduled maintenance from years of inspection data. To validate the proposed method, a case study containing hundreds of bridges is used to develop optimal life-cycle management strategies. The optimization solutions recommend fewer replacement actions and prefer preventative repair actions when bridges are damaged or are expected to be damaged. By employing the optimal life-cycle regional maintenance strategies, the conditions of bridges can be controlled to a good level. Compared to the nature DQNs, DDQNs offer an optimized scheme containing fewer low-condition bridges and a more costeffective life-cycle management plan.