• 제목/요약/키워드: the method of indicators

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ICT 인프라 이상탐지를 위한 조건부 멀티모달 오토인코더에 관한 연구 (A Study of Anomaly Detection for ICT Infrastructure using Conditional Multimodal Autoencoder)

  • 신병진;이종훈;한상진;박충식
    • 지능정보연구
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    • 제27권3호
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    • pp.57-73
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    • 2021
  • ICT 인프라의 이상탐지를 통한 유지보수와 장애 예방이 중요해지고 있다. 장애 예방을 위해서 이상탐지에 대한 관심이 높아지고 있으며, 지금까지의 다양한 이상탐지 기법 중 최근 연구들에서는 딥러닝을 활용하고 있으며 오토인코더를 활용한 모델을 제안하고 있다. 이는 오토인코더가 다차원 다변량에 대해서도 효과적으로 처리가 가능하다는 것이다. 한편 학습 시에는 많은 컴퓨터 자원이 소모되지만 추론과정에서는 연산을 빠르게 수행할 수 있어 실시간 스트리밍 서비스가 가능하다. 본 연구에서는 기존 연구들과 달리 오토인코더에 2가지 요소를 가미하여 이상탐지의 성능을 높이고자 하였다. 먼저 다차원 데이터가 가지고 있는 속성별 특징을 최대한 부각하여 활용하기 위해 멀티모달 개념을 적용한 멀티모달 오토인코더를 적용하였다. CPU, Memory, network 등 서로 연관이 있는 지표들을 묶어 5개의 모달로 구성하여 학습 성능을 높이고자 하였다. 또한, 시계열 데이터의 특징을 데이터의 차원을 늘리지 않고 효과적으로 학습하기 위하여 조건부 오토인코더(conditional autoencoder) 구조를 활용하는 조건부 멀티모달 오토인코더(Conditional Multimodal Autoencoder, CMAE)를 제안하였다. 제안한 CAME 모델은 비교 실험을 통해 검증했으며, 기존 연구들에서 많이 활용된 오토인코더와 비교하여 AUC, Accuracy, Precision, Recall, F1-score의 성능 평가를 진행한 결과 유니모달 오토인코더(UAE)와 멀티모달 오토인코더(Multimodal Autoencoder, MAE)의 성능을 상회하는 결과를 얻어 이상탐지에 있어 효과적이라는 것을 확인하였다.

COVID-19 발생 전·후 생활권 공원녹지 모빌리티 변화 분석 (Mobility Change around Neighborhood Parks and Green Spaces before and after the Outbreak of the COVID-19 Pandemic)

  • 최가윤;김용국;권오규;유예슬
    • 한국조경학회지
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    • 제51권4호
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    • pp.101-118
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    • 2023
  • 팬데믹 기간 동안 도시민의 생활권 공원녹지 이용률은 크게 증가하였으며 COVID-19의 발생은 도시민들에게 생활권 공원녹지의 가치와 기능을 부각시키는 계기가 되었다. 본 연구에서는 COVID-19 발생 전·후 시민들의 이동 및 생활권 공원녹지 이용이 어떻게 변화했는지 실증 분석하고, 이러한 변화에 영향을 미친 사회·공간적 특성을 살펴보고자 한다. 분석 방법으로는 첫째, 통신사 시그널 데이터를 활용하여 생활권 공원녹지 모빌리티 변화를 분석하였다. 체류시간 및 이동량 변화 분석을 통해 COVID-19 발생 이후 나타난 시민들의 이동 특성과 보행 기반의 생활권 공원녹지 방문량 변화를 살펴보았다. 둘째, 생활권 공원녹지 모빌리티 변화에 영향을 미치는 요인을 분석하였다. 상관관계분석과 다중회귀분석을 통해 COVID-19 발생 전·후 시민들의 생활권 공원녹지 방문량에 영향을 미치는 사회·공간적 특성을 살펴보았다. 이후 군집분석을 통해 생활권 공원녹지 서비스의 공급 및 관리 관점에서 포스트 코로나 대응을 위한 생활권 유형을 구분하고, 유형별 생활권 공원녹지 개선 방향을 제시하였다. 주요 연구 결과는 다음과 같다. 첫째, COVID-19 발생 이후 거주지 주변 500m 이내에서의 활동이 증가하였다. 도보생활권에서의 체류시간과 보행 이동량은 2020년과 2021년 모두 증가하였으며 이는 변화한 도보생활권의 범위를 고려해 공원녹지의 양적 확보 기준과 유치거리 등을 재검토할 필요성이 높아졌음을 의미한다. 둘째, 보행을 통한 생활권 공원녹지 방문량이 COVID-19 발생 이후 전반적으로 증가하였다. 집을 중심으로 한 생활권 공원녹지 방문량뿐만 아니라 직장을 중심으로 한 방문량 역시 크게 증가하였다. 팬데믹 시대의 공원녹지 정책은 주거지와 상업·업무시설 밀집지역을 중심으로 서비스 소외지역을 발굴하고, 해당 지역의 공원녹지 서비스를 양적·질적으로 개선하는 방향으로 추진되어야 할 것이다. 셋째, 공원녹지 서비스 수준이 높은 지역일수록 보행을 통한 이동이 많은 것으로 나타났다. 공원녹지의 확보 기준을 단순 면적으로 볼 것이 아니라 보행 접근성 등 시민들의 실제 공원녹지 서비스 향상에 기여하는 지표를 활용할 필요가 있겠다. 넷째, 군집분석 결과 팬데믹 시대에 대응한 생활권 공원녹지의 개선 유형이 다섯 가지로 도출되었다. 이는 앞으로의 공원녹지 정책에서 소규모 생활권 단위의 사회경제적 지위 특성, 공원녹지 서비스 수준 등을 복합적으로 고려할 필요가 있음을 시사한다. 본 연구는 통신사 시그널 데이터 분석, GIS 분석, 통계분석 등 다각적인 분석 방법론을 활용해 포스트 코로나 시대에 대응한 생활권 공원녹지 정책 수립의 근거를 마련했다는 학술적, 정책적 의의를 갖는다.

동맥경화성 하지 동맥 폐색증에 대한 우회로 수술의 효과 (The Effect of a Bypass Operation for Atherosclerotic Arterial Obstructive Disease at the Lower Extremity)

  • 최원석;박재민;이양행;한일용;전희재;윤영철;황윤호;조광현
    • Journal of Chest Surgery
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    • 제41권5호
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    • pp.610-618
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    • 2008
  • 배경: 동맥경화성 하지 동맥 폐색증의 치료는 보존적 운동 요법, 약물 요법, 수술 방법 등으로 증상의 완화 및 혈류 개선을 기대할 수 있는데 그 중 동맥간 우회로 수술이 가장 효과적이라고 알려져 있다. 본 연구는 본원에서 시행한 우회로 수술의 단기 추적 결과를 조사하여 그 효과를 평가하고 개존율에 영향을 미치는 인자를 분석하여 향후 치료의 지표로 삼고자 한다. 대상 및 방법: 2002년 6월에서 2006년 4월까지 본원 흉부외과에서 동맥경화성 하지 동맥 폐색증으로 진단받고 동맥간 우회로 수술을 받았던 환자 96명을 대상으로 하였다. 증상과 Ankle-brachial index (ABI)의 변화를 통해 우회로 수술의 효용성을 파악하고 수술 후 합병증, 하지 절단율 그리고 이식편 개존율 등을 통해 단기 결과를 확인하였다. 성별, 연령, 흡연 유무, 동반 질환, 문합 위치, 이식편의 크기와 종류 등의 항목으로 개존율에 미치는 위험인자를 확인하였다. 이외에 폐색 부위, 약 복용 등을 각 의무기록을 바탕으로 후향적으로 조사하였다. 전체 평균 추적 기간은 $29.4{\pm}13.1$개월이었다. 결과: 대상 환자들의 평균 연령은 $65.95{\pm}9.61$세로 남성이 88예였으며 허혈성 하지 통증이 가장 많은 증상이었다. 동반 질환으로는 고혈압(61%), 당뇨병(42%), 심장 질환(35%) 순이었고 흡연자는 88명(91.7%)이었다 동맥 폐색 부위 중 가장 많은 부위는 표재성 대퇴동맥으로 44예(40%) 이었다. 수술 방법 중 이식편으로 Polytetra-fluoroethylene (PTFE) 인조 혈관을 이용한 대퇴-슬와동맥간 우회로술을 가장 많이 시행하였으며 대복재정맥도 11예에서 사용하였다. ABI는 수술 전 $0.30{\pm}0.11$에서 수술 후 $0.63{\pm}0.11$으로 의미 있는 증가를 보였다(p<0.001). 수술 후 1년, 3년 이식편 개존율은 각각 86.4%, 68.0%이었다. 개존 실패를 보인 경우는 29예(30.21%)였으며 남성, 흡연 그리고 고혈압이 동반되어 있는 경우가 실패군에서 유의하게 높았고 이 중 고혈압이 위험인자로 유의한 결과를 보였다(p=0.042). 결론: 동맥경화성 하지 동맥 폐색증의 동맥간 우회로 수술은 하지 통증, 파행증의 호전과 하지 절단을 예방하는데 비교적 효과적인 치료 방법이다. 장기적인 이식편 개존율을 유지하기 위해서는 남성 흡연자의 금연을 적극 유도하고 고혈압 환자의 철저한 혈압 조절이 동반됨과 동시에 수술시 적절한 이식편의 선택, 규칙적인 약물 복용, 꾸준한 외래 추적관찰 등의 효과적인 관리가 필요할 것으로 사료된다.

가족계획과 모자보건 통합을 위한 조산원의 투입효과 분석 -서산지역의 개입연구 평가보고- (An Intervention Study on Integration of Family Planning and Maternal/Infant Care Services in Rural Korea)

  • 방숙;한성현;이정자;안문영;이인숙;김은실;김종호
    • Journal of Preventive Medicine and Public Health
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    • 제20권1호
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    • pp.165-203
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    • 1987
  • This project was a service-cum-research effort with a quasi-experimental study design to examine the health benefits of an integrated Family Planning (FP)/Maternal & Child health (MCH) Service approach that provides crucial factors missing in the present on-going programs. The specific objectives were: 1) To test the effectiveness of trained nurse/midwives (MW) assigned as change agents in the Health Sub-Center (HSC) to bring about the changes in the eight FP/MCH indicators, namely; (i)FP/MCH contacts between field workers and their clients (ii) the use of effective FP methods, (iii) the inter-birth interval and/or open interval, (iv) prenatal care by medically qualified personnel, (v) medically supervised deliveries, (vi) the rate of induced abortion, (vii) maternal and infant morbidity, and (viii) preinatal & infant mortality. 2) To measure the integrative linkage (contacts) between MW & HSC workers and between HSC and clients. 3) To examine the organizational or administrative factors influencing integrative linkage between health workers. Study design; The above objectives called for quasi-experimental design setting up a study and control area with and without a midwife. An active intervention program (FP/MCH minimum 'package' program) was conducted for a 2 year period from June 1982-July 1984 in Seosan County and 'before and after' surveys were conducted to measure the change. Service input; This study was undertaken by the Soonchunhyang University in collaboration with WHO. After a baseline survery in 1981, trained nurses/midwives were introduced into two health sub-centers in a rural setting (Seosan county) for a 2 year period from 1982 to 1984. A major service input was the establishment of midwifery services in the existing health delivery system with emphasis on nurse/midwife's role as the link between health workers (nurse aids) and village health workers, and the referral of risk patients to the private physician (OBGY specialist). An evaluation survey was made in August 1984 to assess the effectiveness of this alternative integrated approach in the study areas in comparison with the control area which had normal government services. Method of evaluation; a. In this study, the primary objective was first to examine to what extent the FP/MCH package program brought about changes in the pre-determined eight indicators (outcome and impact measures) and the following relationship was first analyzed; b. Nevertheless, this project did not automatically accept the assumption that if two or more activities were integrated, the results would automatically be better than a non-integrated or categorical program. There is a need to assess the 'integration process' itself within the package program. The process of integration was measured in terms of interactive linkages, or the quantity & quality of contacts between workers & clients and among workers. Intergrative linkages were hypothesized to be influenced by organizational factors at the HSC clinic level including HSC goals, sltrurture, authority, leadership style, resources, and personal characteristics of HSC staff. The extent or degree of integration, as measured by the intensity of integrative linkages, was in turn presumed to influence programme performance. Thus as indicated diagrammatically below, organizational factors constituted the independent variables, integration as the intervening variable and programme performance with respect to family planning and health services as the dependent variable: Concerning organizational factors, however, due to the limited number of HSCs (2 in the study area and 3 in the control area), they were studied by participatory observation of an anthropologist who was independent of the project. In this observation, we examined whether the assumed integration process actually occurred or not. If not, what were the constraints in producing an effective integration process. Summary of Findings; A) Program effects and impact 1. Effects on FP use: During this 2 year action period, FP acceptance increased from 58% in 1981 to 78% in 1984 in both the study and control areas. This increase in both areas was mainly due to the new family planning campaign driven by the Government for the same study period. Therefore, there was no increment of FP acceptance rate due to additional input of MW to the on-going FP program. But in the study area, quality aspects of FP were somewhat improved, having a better continuation rate of IUDs & pills and more use of effective Contraceptive methods in comparison with the control area. 2. Effects of use of MCH services: Between the study and control areas, however, there was a significant difference in maternal and child health care. For example, the coverage of prenatal care was increased from 53% for 1981 birth cohort to 75% for 1984 birth cohort in the study area. In the control area, the same increased from 41% (1981) to 65% (1984). It is noteworthy that almost two thirds of the recent birth cohort received prenatal care even in the control area, indicating that there is a growing demand of MCH care as the size of family norm becomes smaller 3. There has been a substantive increase in delivery care by medical professions in the study area, with an annual increase rate of 10% due to midwives input in the study areas. The project had about two times greater effect on postnatal care (68% vs. 33%) at delivery care(45.2% vs. 26.1%). 4. The study area had better reproductive efficiency (wanted pregancies with FP practice & healthy live births survived by one year old) than the control area, especially among women under 30 (14.1% vs. 9.6%). The proportion of women who preferred the 1st trimester for their first prenatal care rose significantly in the study area as compared to the control area (24% vs 13%). B) Effects on Interactive Linkage 1. This project made a contribution in making several useful steps in the direction of service integration, namely; i) The health workers have become familiar with procedures on how to work together with each other (especially with a midwife) in carrying out their work in FP/MCH and, ii) The health workers have gotten a feeling of the usefulness of family health records (statistical integration) in identifying targets in their own work and their usefulness in caring for family health. 2. On the other hand, because of a lack of required organizational factors, complete linkage was not obtained as the project intended. i) In regards to the government health worker's activities in terms of home visiting there was not much difference between the study & control areas though the MW did more home visiting than Government health workers. ii) In assessing the service performance of MW & health workers, the midwives balanced their workload between 40% FP, 40% MCH & 20% other activities (mainly immunization). However, $85{\sim}90%$ of the services provided by the health workers were other than FP/MCH, mainly for immunizations such as the encephalitis campaign. In the control area, a similar pattern was observed. Over 75% of their service was other than FP/MCH. Therefore, the pattern shows the health workers are a long way from becoming multipurpose workers even though the government is pushing in this direction. 3. Villagers were much more likely to visit the health sub-center clinic in the study area than in the control area (58% vs.31%) and for more combined care (45% vs.23%). C) Organization factors (admistrative integrative issues) 1. When MW (new workers with higher qualification) were introduced to HSC, it was noted that there were conflicts between the existing HSC workers (Nurse aids with less qualification than MW) and the MW for the beginning period of the project. The cause of the conflict was studied by an anthropologist and it was pointed out that these functional integration problems stemmed from the structural inadequacies of the health subcenter organization as indicated below; i) There is still no general consensus about the objectives and goals of the project between the project staff and the existing health workers. ii) There is no formal linkage between the responsibility of each member's job in the health sub-center. iii) There is still little chance for midwives to play a catalytic role or to establish communicative networks between workers in order to link various knowledge and skills to provide better FP/MCH services in the health sub-center. 2. Based on the above findings the project recommended to the County Chief (who has power to control the administrative staff and the technical staff in his county) the following ; i) In order to solve the conflicts between the individual roles and functions in performing health care activities, there must be goals agreed upon by both. ii) The health sub·center must function as an autonomous organization to undertake the integration health project. In order to do that, it is necessary to support administrative considerations, and to establish a communication system for supervision and to control of the health sub-centers. iii) The administrative organization, tentatively, must be organized to bind the health worker's midwive's and director's jobs by an organic relationship in order to achieve the integrative system under the leadership of health sub-center director. After submitting this observation report, there has been better understanding from frequent meetings & communication between HW/MW in FP/MCH work as the program developed. Lessons learned from the Seosan Project (on issues of FP/MCH integration in Korea); 1) A majority or about 80% of the couples are now practicing FP. As indicated by the study, there is a growing demand from clients for the health system to provide more MCH services than FP in order to maintain the achieved small size of family through FP practice. It is fortunate to see that the government is now formulating a MCH policy for the year 2,000 and revising MCH laws and regulations to emphasize more MCH care for achieving a small size family through family planning practice. 2) Goal consensus in FP/MCH shouBd be made among the health workers It administrators, especially to emphasize the need of care of 'wanted' child. But there is a long way to go to realize the 'real' integration of FP into MCH in Korea, unless there is a structural integration FP/MCH because a categorical FP is still first priority to reduce the rate of population growth for economic reasons but not yet for health/welfare reasons in practice. 3) There should be more financial allocation: (i) a midwife should be made available to help to promote the MCH program and coordinate services, (in) there should be a health sub·center director who can provide leadership training for managing the integrated program. There is a need for 'organizational support', if the decision of integration is made to obtain benefit from both FP & MCH. In other words, costs should be paid equally to both FP/MCH. The integration slogan itself, without the commitment of paying such costs, is powerless to advocate it. 4) Need of management training for middle level health personnel is more acute as the Government has already constructed 90 MCH centers attached to the County Health Center but without adequate manpower, facilities, and guidelines for integrating the work of both FP and MCH. 5) The local government still considers these MCH centers only as delivery centers to take care only of those visiting maternity cases. The MCH center should be a center for the managment of all pregnancies occurring in the community and the promotion of FP with a systematic and effective linkage of resources available in the county such as i.e. Village Health Worker, Community Health Practitioner, Health Sub-center Physicians & Health workers, Doctors and Midwives in MCH center, OBGY Specialists in clinics & hospitals as practiced by the Seosan project at primary health care level.

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