• 제목/요약/키워드: Problem areas

검색결과 2,140건 처리시간 0.033초

인공벌군집을 적용한 무선네트워크 셀 그룹핑 설계 (Cell Grouping Design for Wireless Network using Artificial Bee Colony)

  • 김성수;변지환
    • 산업경영시스템학회지
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    • 제39권2호
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    • pp.46-53
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    • 2016
  • In mobile communication systems, location management deals with the location determination of users in a network. One of the strategies used in location management is to partition the network into location areas. Each location area consists of a group of cells. The goal of location management is to partition the network into a number of location areas such that the total paging cost and handoff (or update) cost is a minimum. Finding the optimal number of location areas and the corresponding configuration of the partitioned network is a difficult combinatorial optimization problem. This cell grouping problem is to find a compromise between the location update and paging operations such that the cost of mobile terminal location tracking is a minimum in location area wireless network. In fact, this is shown to be an NP-complete problem in an earlier study. In this paper, artificial bee colony (ABC) is developed and proposed to obtain the best/optimal group of cells for location area planning for location management system. The performance of the artificial bee colony (ABC) is better than or similar to those of other population-based algorithms with the advantage of employing fewer control parameters. The important control parameter of ABC is only 'Limit' which is the number of trials after which a food source is assumed to be abandoned. Simulation results for 16, 36, and 64 cell grouping problems in wireless network show that the performance of our ABC is better than those alternatives such as ant colony optimization (ACO) and particle swarm optimization (PSO).

A Dual Problem and Duality Theorems for Average Shadow Prices in Mathematical Programming

  • Cho, Seong-Cheol
    • 한국경영과학회지
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    • 제18권2호
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    • pp.147-156
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    • 1993
  • Recently a new concept of shadow prices, called average shadow price, has been developed. This paper provides a dual problem and the corresponding duality theorems justifying this new shadow price. The general duality framework is used. As an important secondary result, a new reduced class of price function, the pp. h.-class, has been developed for the general duality theory. This should be distinguished from other known reductions achieved in some specific areas of mathematical programming, in that it sustains the strong duality property in all the mathematical programs. The new general dual problem suggested with this pp. h.-class provides, as an optimal solution, the average shadow prices.

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힐베르트의 세 번째 문제

  • 한인기
    • 한국수학사학회지
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    • 제12권2호
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    • pp.25-39
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    • 1999
  • In Euclidean plane geometry, areas of polygons can be computed through a finite process of cutting and pasting. The Hilbert's third problem is that a theory of volume can not be based on the idea of cutting and pasting. This problem was solved by Dehn a few months after it was posed. The purpose of this article is not only to study Hilbert's third Problem and its proof but also to provide basis for the secondary school mathematics.

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센서네트워크 상의 노드 밀집지역 간 상호연결을 위한 문제 (Interconnection Problem among the Dense Areas of Nodes in Sensor Networks)

  • 김준모
    • 대한전자공학회논문지TC
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    • 제48권2호
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    • pp.6-13
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    • 2011
  • 본 논문은 ad-hoc 네트워크 또는 센서 네트워크상에서, 주어진 노드들 사이를 상호연결하기 위해 중간노드들을 추가 배치시키는 형태의 상호연결 문제에 대한 연구이다. 이 문제는 NP-hard problem으로 변환된다. 네트워크의 노드들은 응용시스템 또는 지형적인 요인에 의해 일부지역에서는 밀집하여 분포되고, 그 외의 지역에서는 희박하게 분포될 수 있다. 이러한 경우, 노드들이 밀집한 지역의 상호연결을 무시함으로써, 보다 짧은 실행시간 안에 추가노드들의 최적배치에 근접하도록 하는 방법을 만들 수 있다. 그러나 이러한 경우라 하더라도 여전히 NP-hard이므로, 동적프로그래밍을 구현함으로써 다항시간 근사전략(PTAS)을 구성하는 것이 타당하다. 실행결과 등에 대한 분석은 목적함수를 적절하게 정의함으로써 가능해 진다. 목적함수는 노드 밀집지역을 추상화시킴에 의해 발생하게 되는 문제점에 대처할 수 있도록 정의되어야 한다.

문제중심학습(PBL)과 간호대학생의 자기주도적 학습능력, 문제해결능력, 학업적 자기효능감 및 학습동기에 대한 융합연구 (Convergence Study about Problem-based Learing and Self-directed Learning Ability, Problem Solving Skills, Academic Self-efficacy, Motivation toward Learning of Nursing Students)

  • 강승주;김은주;신해진
    • 한국융합학회논문지
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    • 제7권2호
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    • pp.33-41
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    • 2016
  • 본 연구는 간호대학생에게 문제중심학습(PBL)을 적용하여 그 효과를 자기주도적 학습능력, 문제해결능력, 학업적 자기효능감 및 학습동기를 통해 확인하고자 시도된 융합연구이다. 연구대상은 J도 J시에 소재한 대학의 간호학과 2학년 학생 51명이었으며, 연구설계는 단일군 사전사후 설계의 원시실험연구이다. 연구결과 PBL수업 후 문제해결능력(t=-3.30, p=.002)과 학습동기는 통계적으로 유의미하게 증가(t=3.004, p=.004)되었으나, 자기주도적 학습능력과 학업적 자기효능감은 통계적으로 유의한 변화를 보이지 않았다. 본 연구를 통해 PBL이 간호대학생의 학습 역량을 향상시킴에 적합한 교수-학습방법임을 확인할 수 있었으며, 추후 PBL의 설계 시, 효과를 증진시키기 위해 요구되는 다양한 변수의 확인을 위한 연구를 제안하고자 한다.

가족발달단계에 따른 간호요구영역에 관한 연구 (Study of The Area of Nursing Need by the Family Developmental Stage)

  • 최부옥
    • 대한간호학회지
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    • 제7권2호
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    • pp.43-59
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    • 1977
  • The Community Health Service considers the family as a service unit and places the emphasis of its service on the health problems and the nursing needs of the family rather than the individual. From the conceptual point of view that tile community health service is both health maintenance and health promotion of the family, the community health nurse should have a knowledge of the growth and development of the family and be responsible for the comprehensive support of normal family development. The community health nurse often is in a position to make a real contribution to normal family development. In order to investigate the relationship between the areas of nursing need and family development, the following objectives were established 1. To discover the general characteristics of the study population by the stage of family development. 2. To discover specific nursing needs in relation to the family developmental stage, and to determine the intensity of the nursing needs and the ability of the family to cope with these needs. 3. To discover overall family health nursing problems in relation to the family developmental stage and determine the intensity of the nursing need and the problem solving ability of family. Definitions : The family developmental stages as classified by Dually were used stage 1. Married couples(without children) stage 2. Childbearing Families (oldest child birth to 30 months of age) stage 3. Families with preschool children (oldest child 2½-to 6 years) stage 4. Families with schoolchildren (oldest child 6 to 13 years). stage 5. Families with teenagers (oldest child 13 to 20 years) stage 6. Families as launching centers (first child gone to last child′s leaving home). stage 7. Middle- aged parents (empty nest to retirement) stage 8. Aging family member (retirement to death of both spouses) The areas of nursing need were defined as those used in the study, "A Comprehensive Study about Health and Nursing Need and a Social Diagram of the Community", by tile Nursing research Institute and Center for population. and Family Planning, July 1974. The study population defiled and selected were 260 nuclear families ill two myron of Kang Hwa Island. Percent, mean value and F- test were utilized in tile statistical analysis of the study result. Findings : 1. General characteristics of the study population by tile family developmental stage ; 1)The study population was distributed by the family developmental stage as follows : stage 1 : 3 families stage 2 : 13 families stage 3 : 24 families stage 4 : 41 families stage 5 : 50 families stage 6 : 106 families stage 7 : 13 families stage 8 : 10 families 2) Most families had 4 or 5 members except for those in stage, 1, 7, and 8. 3) The parents′ present age was older in the higher developmental stage and their age at marriage was also younger in the higher developmental stages. 4) The educational level of parents was primarily less than elementary school irrespective of the developmental stage. 5) More than half of parents′ occupations were listed as laborers irrespective of the developmental stage, 6) More than half of the parents were atheists irrespective of the developmental stage. 7) The higher the developmental stage(from stage 2 to stage 6 ), the wider the distribution of children′s ages. 8) More than half of the families were of middle or lower socio-economic level. 2. Problems in specific areas of nursing need by family developmental stage, the intensity of nursing need and the problem solving ability of the family : 1) As a whole, many problems, irrespective of the developmental stage, occurred in tile areas of Housing and Sanitation, Eating Patterns, Housekeeping, Preventive Measures and Dental care. Problems occurring ill particular stages included the following ; stage 1 : Prevention of Accident stage 2 : Preventive Vaccination, Family Planning. stage 3 : Preventive Vaccination, Maternal Health, Family Planning, Health of Infant and Preschooler. stage 4, 5 : Preventive Vaccination, Family Planning, Health of School Children. stage 6 : Preventive Vaccination, Health of School Children. 2) The intensity of the nursing need in the area of Acute and Chronic Diseases was generally of moderate degree or above irrespective of the developmental stages except for stage 1. Other areas of need listed as moderate or above were found in the following stages: stage 1 : Maternal Health stage 3 . Horsing and Sanitation, Prevention of Accident. stage 4 . Housing and Sanitation. stage 5 : Housing and Sanitation, Diagnostic and Medical Care. stage 6 : Diagnostic and Medical care stage 7 : Diagnostic and Medical Care, Housekeeping. stage 8 : Housing and Sanitation, Prevention of Accident, Diagnostic and Medical Care, Dental Care, Eating Patterns, Housekeeping. 3) Areas of need with moderate problem solving ability or less were as follows : stage 1 : Diagnostic and Medical Care, Maternal Health. stage 2 : Prevention of Accident, Acute and Chronic Disease, Dental Care. stage 3 : Housing and Sanitation, Acute and Chronic Disease, Diagnostic and Medical Care, Preventive Measure, Dental Care, Maternal Health, Health of Infant and preschooler, Eating Patterns. stage 4 : Housing and Sanitation, Prevention of Accident, Diagnostic and Medical Care, Preventive Measure, Dental Care, Maternal Health, Health of New Born, Health of Infant and Preschooler, Health of school Children, Eating Patterns, Housekeeping. stage 5 . Housing and Sanitation, Prevention of Accident, Acute and Chronic Disease, Diagnostic and Medical Care, Preventive Measure, Dental Care, Preventive Vaccination, Maternal Health, Eating Patterns. stage 7, 8 : Housing and Sanitation, Prevention of Accident, Acute and Chronic Disease, Diagnostic and Medical Care, Preventive Measures, Dental Care, Preventive Vaccination, Eating Patterns , Housekeeping. Problem occurrence, the degree of nursing need and the degree of problem solving ability 1 nursing need areas for the family as a whole were as follows : 1) The higher the stages(except stage 1 ), the lower the rate of problem occurrence. 2) The higher the stage becomes, the lower the intensity of the nursing need becomes. 3) The higher the stages (except stages 7 and 8), the higher. the problem solving ability. Conclusions ; 1) When the nursing care plan for the family is drawn up, depending upon the stage of family development, higher priority should be give to nursing need areas ① at which problems were shown to occur ② where the nursing need is shown to be above moderate degree and ③ where the problem solving ability was shown to be of moderate degree. 2) The priority of the nursing service should be Placed ① not on those families in the high developmental stage but on those families in the low developmental stage ② and on those areas of need shown in stages 7 and 8 where the degree nursing need was high and the ability to cope low.

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지리과에서의 환경교육에 관한 연구 - 고등학교를 중심으로 - (A Study on The Environmental Unit of Geography Curriculum - Centering in High School)

  • 김영미;김창환
    • 한국환경교육학회지:환경교육
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    • 제11권2호
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    • pp.156-176
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    • 1998
  • On the border between the Geography subject and the Science subject, much of the content area is found to be interrelated or shared in common due to the characteristics of each subject. This possibly causes a problem of which of the two subjects should treat these overlapping areas with more responsibility and importance, and, as a result, might cause teachers to neglect the areas and result in insufficient treatment of the areas on both sides. In other words, these overlapping area can be overlooked on both subjects. On the other hand, as the science subject treats these areas more deeply and widely in both quantity and quality, the geography subject might lose its original content area to the science subject and accordingly lose its characteristics as an independent subject. To conclude, the following suggestions must be taken into consideration when we develop and organize the environment-related unit in the geography subject. First, the various real cases damaged by pollution, the efforts and steps to avoid being polluted, the inquiry questions and activities to set up the value of the environment conservation, and sufficient assistant materials such as maps, graphs, photos, illustrations, statistics, which will help to realize the environment problem more directly and clearly, must be presented in the textbooks. Second, as the environment education is not just teaching the environmental pollution, the content should be composed for the students to realize the value of the environment and to change their awareness and attitude toward the environment. Third, the environment education cannot be restricted to a certain subject, or it needs to be approached in multi-subject areas. To exercise a effective environment education while we maintain the unique characteristics of the geography subject, a way to link the environment and the region, which is one of the main concepts of geography, should be developed. Finally, textbooks are indispensible materials to teaching-learning, but for more effective teaching the teachers of geography should try to recompose and reorganize the content and to develop newer and more effective teaching material-aids.

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한국 보건진료원 제도의 시작 (Beginnings of the Community Health Practitioner (CHP) System in Republic of Korea)

  • 이꽃메
    • 한국농촌간호학회지
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    • 제4권1호
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    • pp.31-40
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    • 2009
  • Purpose: This research was done do identify and analyze the beginnings of the community health practitioner system in the Republic of Korea (ROK) around 1980. Method: Primary sources were collected and analyzed, mainly newspapers around 1980, the act for health service for rural areas, and other relative publications. Results: The government of the ROK was trying to solve the problem of doctorless villages and regarded the introduction of primary health care (PHC) services using registered nurses (RNs) to be an economic solution to this problem. The Korean Nurses' Association presented 'a plan for community health service' to the government party and medical association in 1976. In this plan, RNs would provide primary care at the sub-county (myun) level, and hospital would provide secondary care. The Korean Public Health Development Research Center was awarded the project 'RNs and nurse aids as CHP for primary care service and their training'. In 1977, 25 RNs began to work as PHC in 3 areas, and interim findings showed that RNs were very capable of doing PHC. The Ministry of Health and Welfare announced long term plans for health and welfare administration including a tertiary health care delivery system. RNs after training were posted to rural areas with no medical services to do medical treatment for mild cases. The Act for health services for rural areas was enacted on December 31, 1980. Enforcement Ordinance and Enforcement Regulations were enacted in 1981. In 1981, 257 CHP were selected, trained, and deployed. In 1983, the president of the ROK announced continuation of the CHP system for residents of medically vulnerable areas. The number of CHP increased from 257 in 1981 to 2038 in 1989.

희소 모바일 애드 혹 네트워크 환경에서 빅데이터 센싱을 위한 에너지 효율적인 센서 커버리지 알고리즘 (An Energy-Efficient Algorithm for Solving Coverage Problem and Sensing Big Data in Sparse MANET Environments)

  • 길준민
    • 정보처리학회논문지:컴퓨터 및 통신 시스템
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    • 제6권11호
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    • pp.463-468
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    • 2017
  • 모바일 노드를 이용하여 넓은 범위를 센싱하기 위해서는 노드 배치의 균일성이 매우 중요한 이슈 중 하나이다. 본 논문에서는 희소 모바일 애드 혹 네트워크 환경에서 빅 데이터 센싱을 위한 커버리지 문제에 대한 주제를 다룬다. 커버리지 문제에 관한 기존 연구에서는 넓은 범위를 센싱하기 위해 노드의 수가 충분히 많은 환경을 가정하였다. 하지만 희소 모바일 애드 혹 네트워크 환경에서 센서 커버리지 문제는 노드들 간의 센싱 범위가 겹치는 범위를 최소화하기 위해 노드들 간의 거리가 충분히 멀어야 한다. 따라서 본 논문에서는 희소 모바일 애드 혹 네트워크 환경에서 센서 커버리지 문제를 정의하고 중앙 중재자 없이 자가 조직의 방식에 의한 해결 방안을 제시한다. 실험 결과를 통해 제안하는 방식은 커버리지 영역과 에너지 소비 관점에서 효율적임을 보인다.

1인 가구 성인 남성 문제음주의 지역 간 변이요인에 관한 연구: 지리적 가중회귀모형을 이용하여 (Determinants of Problem Drinking by Regional Variation among Adult Males in Single-Person Households: Geographically Weighted Regression Model Analysis)

  • 안중근;최희승;김지우
    • 대한간호학회지
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    • 제53권1호
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    • pp.101-114
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    • 2023
  • Purpose: This study aimed to identify regional differences in problem drinking among adult males in single-person households and predict the determinants. Methods: This study used data from the 2019 Community Health Survey. Geographically weighted regression analysis was performed on 8,625 adult males in single-person households who had been consuming alcohol for the past year. The Si-Gun-Gu was selected as the spatial unit. Results: The top 10 regions for problem drinking among adult males in single-person households were located in the Jeju-do and Jeollanam-do areas near the southern coast, whereas the bottom 10 regions were located in the Incheon and northern Gyeonggi-do areas. Smoking, economic activity, and educational level were common factors affecting problem drinking among this population. Among the determinants of regional disparities in problem drinking among adult males in single-person households, personal factors included age, smoking, depression level, economic activity, educational level, and leisure activity, while regional factors included population and karaoke venue ratio. Conclusion: Problem drinking among adult males in single-person households varies by region, and the variables affecting each particular area differ. Therefore, it is necessary to develop interventions tailored to individuals and regions that reflect the characteristics of each region by prioritizing smoking, economic activity, and educational level as the common factors.