• 제목/요약/키워드: minimum performance for health

검색결과 57건 처리시간 0.032초

소 질병 검출을 위한 혈청학적 검사의 민감도 평가 (Sensitivity analysis of serological tests for detection of disease in cattle)

  • 이상진;문운경;박선일
    • 대한수의학회지
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    • 제50권1호
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    • pp.43-48
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    • 2010
  • Animal disease surveillance system, defined as the continuous investigation of a given population to detect the occurrence of disease or infection for control purposes, has been key roles to assess the health status of an animal population and, more recently, in international trade of animal and animal products with regard to risk assessment. Especially, for a system aiming to determine whether or not a disease is present in a population sensitivity of the system should be maintained high enough not to miss an infected animal. Therefore, when planning the implementation of surveillance system a number of factors that affecting surveillance sensitivity should be taken into account. Of these parameters sample size is of important, and different approaches are used to calculate sample size, usually depending on the objective of surveillance systems. The purpose of this study was to evaluate the sensitivity of the current national serological surveillance programs for four selected bovine diseases assuming a specified sampling plan, to examine factors affecting the probability of detection, and to provide sample sizes required for achieving surveillance goal of detecting at least an infection in a given population. Our results showed that, for example, detecting low level of prevalence (0.2% for bovine tuberculosis) requires selection of all animals per typical Korean cattle farm (n = 17), and thus risk-based target surveillance for high risk groups can be an alternative strategy to increase sensitivity while not increasing overall sampling efforts. The minimum sample size required for detecting at least one positive animal was sharply increased as the disease prevalence is low. More importantly, high reliability of prevalence estimation was expected with increased sampling fraction even when zero-infected animal was identified. The effect of sample size is also discussed in terms of the maximum prevalence when zero-infected animals were identified and on the probability of failure to detect an infection. We suggest that for many serological surveillance systems, diagnostic performance of the testing method, sample size, prevalence, population size, and statistical confidence need to be considered to correctly interpret results of the system.

A hybrid self-adaptive Firefly-Nelder-Mead algorithm for structural damage detection

  • Pan, Chu-Dong;Yu, Ling;Chen, Ze-Peng;Luo, Wen-Feng;Liu, Huan-Lin
    • Smart Structures and Systems
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    • 제17권6호
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    • pp.957-980
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    • 2016
  • Structural damage detection (SDD) is a challenging task in the field of structural health monitoring (SHM). As an exploring attempt to the SDD problem, a hybrid self-adaptive Firefly-Nelder-Mead (SA-FNM) algorithm is proposed for the SDD problem in this study. First of all, the basic principle of firefly algorithm (FA) is introduced. The Nelder-Mead (NM) algorithm is incorporated into FA for improving the local searching ability. A new strategy for exchanging the information in the firefly group is introduced into the SA-FNM for reducing the computation cost. A random walk strategy for the best firefly and a self-adaptive control strategy of three key parameters, such as light absorption, randomization parameter and critical distance, are proposed for preferably balancing the exploitation and exploration ability of the SA-FNM. The computing performance of the SA-FNM is evaluated and compared with the basic FA by three benchmark functions. Secondly, the SDD problem is mathematically converted into a constrained optimization problem, which is then hopefully solved by the SA-FNM algorithm. A multi-step method is proposed for finding the minimum fitness with a big probability. In order to assess the accuracy and the feasibility of the proposed method, a two-storey rigid frame structure without considering the finite element model (FEM) error and a steel beam with considering the model error are taken examples for numerical simulations. Finally, a series of experimental studies on damage detection of a steel beam with four damage patterns are performed in laboratory. The illustrated results show that the proposed method can accurately identify the structural damage. Some valuable conclusions are made and related issues are discussed as well.

초등학교 채광 성능 실태조사에 따른 건축계획적 개선방안에 관한 연구 (Architectural Implementation for the Daylight-Performance in the Elementary School)

  • 이정철;임홍수;김곤;구재오
    • KIEAE Journal
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    • 제10권3호
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    • pp.43-50
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    • 2010
  • Natural lighting is directly connected with our mental and physical health. For working or learning effect, the proper natural lighting is required for improving our living conditions. School facilities, especially, are the place where includes students' ordinary activities with learning behaviors during the school years from elementary to high school. This study was carried out for the purpose introducing a basic database in that planning a school by researching on the actual in the natural lighting system of some schools' classroom, estimating, and analyzing through a simulation, which resulted in a method of improving the natural lighting system. As a result of measuring and analyzing Daylight Factor(DF) during the time from 9 am to 3 pm when students are activating in their classroom, generally DF range of the sides near to window and aisle seats zone are not distributed well. Besides, two out of four school which are researched would not reach the standards of the law for school sanitary while rest of the schools meet the standards; Average DF 5% and Minimum DF 2%. And the result of a simulation by RADIANCE program shows the most appropriate DF range when it is applied in variable numbers about an oriehows the- South-east 15, south-east 30, south-east 45, south-west 15, south-west 30, and south-west 45 degrees. When it is applied in the variable numbers about glass transmittance - 60%, 70%, and 80% in condition facing south of a classroom, the result shows that the DF range of 80% transmittance is relatively higher than other glasses in the classroom. Thus, when a school is built, plans for an orientation is necessary for improve of elementary schools' environment with the glass installation which is made for high transmittance and is regarded with the students' activities time.

표면플라즈몬공명과 효소면역분석법을 이용한 살충제 카보후란 잔류물 검출 (Sensing of the Insecticide Carbofuran Residues by Surface Plasmon Resonance and Immunoassay)

  • 양길모;조남홍
    • Journal of Biosystems Engineering
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    • 제30권6호통권113호
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    • pp.333-339
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    • 2005
  • The pesticide is raising public interest in the world, because it causes damage to an environmental pollution and the human health remaining agricultural products and an ecosystem, in spite of the advantages. Particularly, each country restricts the residual pesticide and induces observance about the safety and usage standard so that they can control the amount of pesticide used and defend the safety of agricultural products. The habitual practice for the analysis of the residual pesticide depends on GC (gas chromatography), HPLC (high performance liquid chromatography) and GC/MS (gas chromatography/mass spectroscopy), which triturate the fixed quantity of samples, abstract and purify as a suitable organic solvent. These methods have the highly efficient in aspects of sensitivity and accuracy. On the other hand, they need the high cost, time consuming, much effort, expensive equipment and the skillful management. Carbofuran is highly toxic by inhalation and ingestion and moderately toxic by dermal absorption. As with other carbamate compounds, it is metabolized in the liver and eventually excreted in the urine. The half-life of carbofuran on crops is about 4 days when applied to roots, and longer than 4 days if applied to the leaves. This research was conducted to develop immunoassay for detecting carbofuran residue quickly on the basis of surface plasmon resonance and to evaluate the measurement sensitivity. Gold chip used was CM5 spreaded dextran on the surface. An applied antibody to Immunoassay was GST (glutathione-s-transferase). The association and the dissociation time were 176 second and 215 second between GST and carbofuran. The total analysis time using surface plasmon resonance was 13 minutes including regeneration time, on the other hand HPLC and GC/MS was 2 hours usually. The minimum detection limit of a permissible amount for carbofuran in the country is 0.1 ppm. The immunoassay method using surface plasmon resonance was 0.002 ppm.

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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유비쿼터스 컴퓨팅 환경을 위한 RFID/WSN 통합 관리 시스템에 관한 연구 (A Study on The RFID/WSN Integrated system for Ubiquitous Computing Environment)

  • 박용민;이준혁
    • 대한전자공학회논문지TC
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    • 제49권1호
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    • pp.31-46
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    • 2012
  • 유비쿼터스 컴퓨팅 환경을 구현하기 위해서 가장 핵심이 되는 기술은 USN(Ubiquitous Sensor Network)기술로써 RFID(Radio Frequency Identification)와 무선 센서 네트워크(Wireless Sensor Network WSN)를 이용한 다양한 센서 기술과 프로세서 집적 기술 그리고 무선 네트워크 기술을 이용해서 실제 물리적 환경 정보를 원격에서 손쉽게 수집하고 모니터링 하는 것을 가능하게 함으로써 기존 가상 공간의 IT 기술을 다양한 실제 환경에서 확대할 수 있도록 한다. 그러나 RFID와 WSN은 이러한 기술적 유사성과 상호 영향에도 불구하고 별 개의 연구로 인식되었으며 RFID와 WSN의 기술적인 융합에 대한 연구는 미비한 수준이다. 이러한 문제점을 인식한 EPCglobal에서는 국제 표준인 EPCglobal Network를 기반으로 RFID와 WSN 기술을 효율적으로 통합/연동할 수 있는 EPC 센서 네트워크(EPC Sensor Network)를 제안하였다. 제안된 EPC 센서 네트워크는 미들웨어에서 복합 이벤트 처리(Complex Event Processing) 기법을 이용하여 RFID와 WSN을 통해 발생되는 데이터를 단일 환경에서 통합하고, 발생된 이벤트를 EPCglobal Network를 기반으로 연동하는 기술이다. 하지만 이러한 EPC 센서 네트워크는 미들웨어에서 복합 이벤트를 검출하기 위해 복합 이벤트를 구성하는 모든 기본 이벤트가 발생하지 못하는 경우에도 계속적인 검사를 수행하기 때문에 연산 비용이 증가되는 문제점이 있다. 또한 센서 데이터의 표현을 위해 RFID 태그의 EPC를 기반으로 센서 데이터를 하나의 결합된 쌍으로 표현한다. 이것은 센서 데이터를 처리하는데 있어 반드시 EPC가 있어야 함을 의미한다. 즉, 센서 데이터만을 위한 관리 기능은 제공하지 못하는 문제점이 있다. 이러한 EPC 센서 네트워크의 문제점들을 해결하기 위하여 본 논문에서는 RFID/WSN 통합 관리 시스템을 제안한다. 제안하는 RFID/WSN 통합 관리 시스템은 첫 번째, RFID와 WSN 데이터를 인터넷 표준 프로토콜인 SIP(Session Initiation Protocol) 기반의 통합 관리 시스템을 제안하였다. 두 번째, 미들웨어에서 불필요한 복합 이벤트 검출 연산을 위하여 복합 이벤트의 최소 조건을 정의하고 조건을 만족하는 경우에만 복합 이벤트를 검출하는 알고리즘을 제안하였다. 제안하는 기법들의 성능을 평가하기 위하여 SIP 기반의 통합관리시스템을 구현하여 성능을 평가하였다.

황련해독탕의 항균활성 및 표준화 연구 (Anti-bacterial Activity and Standardization on Hwangryunhaedok-tang)

  • 이대연;이영우;김완수;심선형;권필승;이인희
    • 대한임상검사과학회지
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    • 제51권2호
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    • pp.214-220
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    • 2019
  • 황련해독탕은 한방산업에서 염증관련 질환에 다빈도로 사용되는 처방이다. 본 연구의 목적은 전통적 한약인 황련해독탕의 항균활성을 확인하고 지표성분을 선정하는 것이다. 황련해독탕의 항균활성을 측정하기 위하여 디스크 확산법과 최소억제농도법을 사용하였다. 사용균주는 Staphylococcus aureus ATCC 25923, Escherichia coli ATCC 23724였으며 대조군으로 oxacillin과 ciprofloxacin을 이용하여 황련해독탕의 항균활성을 확인하였다. 결과적으로 디스크 확산법에서는 S.aureus ATCC 25923에서 황련해독탕 20 mg과 10 mg은 $11.7{\pm}1.3mm$, $8.7{\pm}0.7mm$의 억제환을 형성하였으며 E.coli ATCC 23724에서는 황련해독탕 20 mg이 $8.0{\pm}0.0mm$의 억제환을 형성하였다. 최소억제농도는 S.aureus ATCC 25923가 31.25 mg/mL, E.coli ATCC 23724 에서는 125.0 mg/mL였다. 표준화를 위한 HPLC 정량분석 결과, 황련해독탕은 berberine을 16.55 mg/g 함유하고 있었으며 geniposide를 81.85 mg/g 함유하고 있었다. 천연물을 이용하여 항생제를 개발할 경우에는 내성세균을 억제하고 부작용을 줄일 수 있다는 장점이 있다. 이러한 점을 착안하여 지속적으로 연구를 진행한다면 한방산업과 더불어 여러 산업에서의 발전을 기대할 수 있을 것이다.

전기 차 운행 데이터를 활용한 인공지능 기반의 배터리 분석 및 평가 방법 연구 (Research on artificial intelligence based battery analysis and evaluation methods using electric vehicle operation data)

  • 홍승모
    • 한국정보전자통신기술학회논문지
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    • 제16권6호
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    • pp.385-391
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    • 2023
  • 최근 탄소배출을 최소화하기 위해 전기자동차의 사용이 증가함에 따라 핵심 부품인 리튬이온 배터리의 상태 및 성능 분석의 중요성이 대두되고 있다. 따라서 배터리의 상태 및 성능에 영향을 줄 수 있는 배터리의 전압, 전류 및 온도뿐만 아니라 전기 자동차의 운행 데이터 및 충전 패턴 데이터를 활용한 종합적인 분석이 필요하다. 따라서 전기적 이동 수단에서 수집되는 배터리 데이터 수집 및 데이터 전처리, 단순 배터리 데이터에 추가적인 운전자 운전 습관에 대한 데이터 수집 및 전처리, 분석된 영향인자를 기반으로 인공지능 알고리즘 세부 설계 및 수정, 해당 알고리즘을 기반으로 하는 배터리 분석 및 평가 모델 설계하였다. 본 논문에서는 실시간 전기버스를 대상으로 운행 데이터와 배터리 데이터를 수집하여 Random Forest 알고리즘 활용하여 학습시킨 후, XAI 알고리즘을 통해 배터리 상태 중요 영향인자로 배터리의 상태, 운행 및 충전 패턴 데이터 등을 종합적으로 고려하여 운행 패턴에서 급가속, 급 감속, 급정지와 충 방전 패턴에서 일 주행횟수, 일일 누적 DOD와 셀 방전에서 셀 전압 차 , 셀 최대온도, 셀 최소온도의 요소가 배터리 상태에 많은 영향을 미치는 인자로 확인되었으며, Random Forest 알고리즘 기반으로 배터리 분석 및 평가 모델을 설계하고 평가하였다.

전산화단층촬영 영상에서 통계적 특징을 이용한 질감특징분석 알고리즘의 적용: 간세포암 중심으로 (Application of Texture Feature Analysis Algorithm used the Statistical Characteristics in the Computed Tomography (CT): A base on the Hepatocellular Carcinoma (HCC))

  • 유주은;전태성;권진아;정주영;임인철;이재승;박형후;곽병준;유윤식
    • 한국방사선학회논문지
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    • 제7권1호
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    • pp.9-15
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    • 2013
  • 본 연구는 전산화단층촬영에서 간 질환의 자동 인식으로 질감특징분석(texture feature analysis. TFA) 알고리즘을 제안하고자 하였으며, 간세포암(Hepatocellular carcinoma. HCC)에 대한 컴퓨터보조진단(computer-aided diagnosis. CAD) 시스템을 설계하고, 제안하는 각 알고리즘의 성능을 평가하고자 하였다. HCC 영상에서 분석영역($40{\times}40$ 픽셀)을 설정하고 각 부분영상에 통계적 특징을 이용한 6가지 TFA 파라메터(평균 밝기, 평균 대조도, 평탄도, 왜곡도, 균일도, 엔트로피)비교하여 간세포암 인식률(recognition rate)을 구하였다. 결과적으로 TFA는 간세포암 인식률을 나타내는 척도로 유의함을 알 수 있었으며 6가지 파라메터에서 균일도가 가장 인식률이 높았으며 평균 대조도, 평탄도, 왜곡도가 비교적 높았고 평균 밝기와 엔트로피는 상대적으로 낮은 인식률을 나타내었다. 이와 관련하여 높은 인식률을 보인 알고리즘(최대 97.14%, 최소 82.86%)을 간세포암 영상의 병변을 판별하여 임상의 조기 진단을 보조하여 치료를 시행한다면 진단의 효율성이 높아 질 것으로 판단되었으며, 향후 효율적이고 정량적인 분석을 추가함으로써 질병인식의 일반화에 대한 기준 연구가 필요 할 것으로 사료되었다.

향상된 장애물 극복형 실내 이·승강 전동휠체어의 설계 및 제작 (Design and Manufacture of Improved Obstacle-Overcoming type Indoor Moving and Lifting Electric Wheelchair)

  • 김영필;함헌주;홍성희;고석철
    • 한국산학기술학회논문지
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    • 제21권11호
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    • pp.851-860
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    • 2020
  • 인구 고령화와 건강 복지에 대한 사회적 관심이 높아지면서 재활복지기를 포함한 실버 및 헬스케어 산업과 관련한 연구들이 활발하게 진행되고 있다. 본 연구에서는 기존에 1차적으로 설계·제작되었던 이·승강 전동휠체어를 사용자 측면에서 보다 더 안전성과 편의성을 갖도록 개선하고자 하였다. 사용자 체형을 고려한 헤드레스트 높이조절 기능의 시트 디자인, 사용성 증대를 위한 암레스트의 길이조절 및 95° 회전 기능, 사용자 탑승 편의성을 위한 바닥까지의 시트하강 및 운행 시 승강할 수 있는 기능, 캐스터 회전반경 및 안전성 증대를 위한 발판 추가 및 풋레스트 길이 조절 기능, 승·하강 시 흔들림 방지를 위한 프레임 및 승·하강 링크 설계 등을 개선시켰다. 또한 안전주행을 위한 컨트롤러 및 드라이브 부문과 사용자 편의성 측면의 기능들을 추가적으로 설계·제작하였다. 추가 기능을 보완하여 제작된 실내 전동휠체어의 동작 상태를 평가하기 위해 구동 실험을 수행하였다. 연속 주행시간, 회전반경, 승·하강 최대 하중, 최대 승강 높이, 소음레벨, 운행 보조센서 센싱 최소거리, 서버 및 앱 프로그램 상호연동 및 기기호환성, 듀티 사이클 최대 오차율의 성능실험을 수행하였다. 실험 결과, 더 개선하여 설계·제작한 전동휠체어는 시험 목표 값을 달성하였으며, 성공적으로 동작하는 것을 확인할 수 있었다. 향후 연구로는 개선하여 제작된 이·승강 전동휠체어에 대해 사용자 측면에서의 사용성 평가를 수행할 것이다.