• 한국인터넷방송통신학회논문지
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• 제9권6호
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• pp.141-154
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• 2009

디지털 생태계는 동적인 IT 비지니스를 표현하는 최근의 새로운 용어이다. 디지털 생태계는 여러 기업들의 경쟁, 통합, 다양한 연합형태 등을 통해 이루어지며. 이러한 환경은 아이디 관리 방식을 매우 복잡하게 만들고 있다. 기존의 아이디 관리 방식들은 이러한 환경에 적용하기에는 너무 제한적이거나, 확장성이 부족하며 적용이 가능한 경우에도 너무 복잡하거나, 사용하기가 어려운 경우가 많다. 본 논문은 디지털 생태계에 적합한 자동화된 분산형 아이디 관리 모델로써 효율성, 명확성, 편의성을 갖춘 분산형 아이디 관리 모델을 정의하고 있으며, OASIS의 SAML표준에 기반을 두어 기존의 아이디 관리 기술들과 상호 연동할 수 있는 방법과 아이디 관리를 위한 단일 서비스와 복합서비스를 위한 기본모델과 확장형 모델을 제안하였으며 향후, 관련 산업분야에 응용이 가능할 것으로 기대된다.

• 인터넷정보학회논문지
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• 제11권2호
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• pp.41-48
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• 2010

u-헬스 서비스를 제공하는 애플리케이션은 기본적으로 개인용 건강관리 기기 즉, PHD와 통신이 가능하고 데이터를 주고받 을 수 있어야 한다. 그러나 이러한 장비들은 대부분 자체 프로토콜 규격을 사용하고 있어 측정된 데이터를 수집하고 u-헬스 서비스 프로바이더에 전달하기 위한 통합 게이트웨이 개발이 어려운 현실이다. 본 논문에서는 이러한 문제점 해결을 위해 u-헬스 게이트웨이를 위한 동적 관리 디바이스 어댑터 모델을 제안하고 프로토타입을 구현하였다. 제안된 모델의 검증을 위해 OSGi 기반 u-헬스 게이트웨이 프레임워크 상에서 프로토타잎을 구현했으며 1채널 심전도 및 혈압/혈당 기기에 대한 디바이스 어댑터 모듈을 구현하였고 측정 데이터 수집 및 전달의 정확성을 확인하였고 의료정보 표준인 HL7 시스템과의 메시지 연동을 통해 기존 시스템과의 상호운용이 가능함을 보였다. 또한 객체 직렬화 방식의 통신 모델을 적용해 어플리케이션과의 연동 및 기능 확장이 용이한 구조임을 확인할 수 있었다.

• 한국안전학회지
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• 제31권1호
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• pp.19-24
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• 2016

Rubber parts are widely used in many applications such as dampers, shock absorbers, and seals used in railway and automotive industries. Much research has thus far been conducted on property estimation and life prediction of rubber parts. To predict the service life of rubber parts at room temperature, most prior work adopts the well-known Arrhenius model that needs the accelerated life test in high-temperature conditions. However, they may not reflect the actual conditions of use that rubber parts are usually used under a specific strain condition during long period of time. In this context, we propose a method for the life prediction of rubber parts in actual conditions of use. The proposed method is based on the accelerated life test using stress relaxation during which three relatively high elongation percentages (100%, 200%, and 300%) are applied to the rubber specimens. Rubber specimens were prepared in accordance with KS M 6518 standard and three stress relaxation testers were fabricated for actual experiments. Finally, a inverse power model for life prediction was derived from experimental results. The predicted life was compared with the actual test life for validation.

• Journal of Biosystems Engineering
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• 제39권3호
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• pp.184-193
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• 2014

Purpose: The aim of this study was to develop a technique for the non-destructive and rapid prediction of the moisture content in red pepper powder using near-infrared (NIR) spectroscopy and a partial least squares regression (PLSR) model. Methods: Three red pepper powder products were separated into three groups based on their particle sizes using a standard sieve. Each product was prepared, and the expected moisture content range was divided into six or seven levels from 3 to 21% wb with 3% wb intervals. The NIR reflectance spectra acquired in the wavelength range from 1,100 to 2,300 nm were used for the development of prediction models of the moisture content in red pepper powder. Results: The values of $R{_V}{^2}$, SEP, and RPD for the best PLSR model to predict the moisture content in red pepper powders of varying particle sizes below 1.4 mm were 0.990, ${\pm}0.487%$ wb, and 10.00, respectively. Conclusions: These results demonstrated that NIR spectroscopy and a PLSR model could be useful techniques for measuring rapidly and non-destructively the moisture content in red pepper powder.

• 정보처리학회논문지:컴퓨터 및 통신 시스템
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• 제1권3호
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• pp.171-180
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• 2012

전력시스템의 배전분야 정보모델 및 데이터교환 국제표준인 CIM(Common Information Model, IEC61968) 기반 MDMS(Meter Data Management System, 미터데이터관리시스템) 개발에 있어서, 가장 중점을 두는 부분은 짧은 주기로 수집되는 데이터의 효과적인 관리와 AMI 데이터를 활용하기 위하여 상위시스템들과 어떻게 통합서비스 할 것인가에 대한 이슈이다. 본 논문에서는 기존의 AMR 환경과 다르게 양방향 서비스 인프라를 제공하는 AMI 환경에서 MDMS 구현 방안과 기능들을 제안한다. 본 논문에서 제안하는 MDMS의 특징은 국제전력표준인 CIM과 통합서비스버스(ESB)를 활용하여 상호운영성을 확보했다는 점과 컴포넌트 기반으로 시스템 모듈을 구현하여 현장 활용도 향상이 가능하다는 점이다. 본 연구의 제안된 결과는 지능형전력망 구현에 있어서 CIM 기반 전력시스템의 효율적인 개발 및 운영에 기여할 것으로 기대한다.

• 한국물환경학회지
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• 제36권6호
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• pp.636-650
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• 2020

A modeling system that can consider the overall water environment and be used to integrate hydrology, water quality, and aquatic ecosystem on a watershed scale is essential to support decision-making in integrated water resources management (IWRM). In adapting imported models for evaluating the unique water environment in Korea, a platform perspective is becoming increasingly important. In this study, a modeling platform is defined as an ecosystem that continuously grows and provides sustainable values through voluntary participation- and interaction-of all stakeholders- not only experts related to model development, but also model users and decision-makers. We assessed the conceptual values provided by the IWRM modeling platform in terms of openness, transparency, scalability, and sustainability. I We also reviewed the technical aspects of functional and spatial integrations in terms of socio-economic factors and user-centered multi-scale climate-forecast information. Based on those conceptual and technical aspects, we evaluated potential modeling platforms such as Source, FREEWAT, Object Modeling System (OMS), OpenMI, Community Surface-Dynamics Modeling System (CSDMS), and HydroShare. Among them, CSDMS most closely approached the values suggested in model development and offered a basic standard for easy integration of existing models using different program languages. HydroShare showed potential for sharing modeling results with the transparency expected by model user-s. Therefore, we believe that can be used as a reference in development of a modeling platform appropriate for managing the unique integrated water environment in Korea.

• 한국콘텐츠학회논문지
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• 제13권2호
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• pp.512-521
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• 2013

본 논문에서는 정보 서비스 기획 단계에서 시맨틱 기반으로 NDSL+NTIS 데이터베이스를 융 복합하여 국가R&D정보 내비게이션 서비스를 개발하기 위한 사용자 니즈 분석과 정보 시각화에 대해 알아본다. 사용자 니즈를 조사 분석하기 위해 산 학 연 연구자 중심으로 30명의 설문과 12명의 현장 인터뷰를 통해 여러 R&D 정보 서비스로부터 개선 방안을 마련하였다. 또한 새로운 정보 시각화 서비스를 설계하기 위해 대화형 내비게이션 타입의 국가R&D 정보 시각화 서비스를 제안하고 사용자 니즈 분석에 따라 페르소나와 화면 프로토타입을 작성하였다. 본 논문에서는 345,411건의 학술 논문과 620,55건의 공저자, 49,958건의 연구보고서를 NDSL에서 가져오고 187,466건의 국가R&D 과제를 NTIS에서 가져와서 융합하는 국가 R&D정보 융 복합 아키텍처를 설계하였다. 향후 본 논문에서 제안한 국가R&D정보 융 복합 아키텍처가 R&D 정보 융 복합의 선도 모델 및 표준이 되고 대화형 내비게이션 타입의 정보시각화 서비스가 사용성을 크게 향상시키기를 기대한다.

• 보건행정학회지
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• 제29권2호
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• pp.195-205
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• 2019

Background: The food and food service influence the quality of life and the general health condition of older persons living in long-term care (LTC) facilities. Purchasing good food materials is a ground of good food service. In Korea, the residents in LTC facilities should pay for the cost of food materials and ingredients out of their pocket because it is not covered by LTC insurance. This study explored what factors affect the cost of food materials paid by LTC facility residents and which factor affects most. Methods: We used data from the study on out-of-pocket payment on national LTC insurance, which surveyed 1,552 family caregivers of older residents in LTC facilities. We applied conditional multi-level model, of which the first level represents the characteristics of care receivers and caregivers and its second level reflects those of LTC facilities. Results: We found that the facility residents with college-graduated family caregivers paid 11,545 Korean won more than those with less than elementary-graduated ones. However, the income level of family caregivers did not significantly affect the amount of the food material cost of the residents. The residents in privately owned, large, metropolitan-located facilities were likely to pay more than those in other types of facilities. The amount of the food material cost of the residents was mainly decided by the facility level factors rather than the characteristics of care recipients and their family caregivers (intra-class correlation=82%). Conclusion: These findings suggest that it might be effective to design a policy targeting facilities rather than residents in order to manage the cost of food materials of residents in LTC facilities. Setting a standard price for food materials in LTC facilities, like Japan, could be suggested as a feasible policy option. It needs to inform the choice of LTC users by providing comparable food material cost information. The staffing requirement of nutritionist also needs to be reviewed.

• 한국비블리아학회지
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• 제21권4호
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• pp.49-66
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• 2010

현대과학기술의 발전은 한 사회의 문화와 사회구성원간의 커뮤니케이션에 큰 영향을 미친다. 따라서 기존의 정보를 수집, 정리하여 이용자에게 제공하던 도서관은 현대사회의 변화에 발맞추어 다양한 역할을 부여받게 되었다. 최근 공공도서관 신축 또는 리모델링 수요의 급증이 예상되고 있지만 우리는 아직 도서관의 유형과 서비스 규모를 고려한 도서관 공간운영에 대한 모델이 없는 실정이다. 본 연구는 공공 도서관이 합리적이고 체계적인 공간운영을 하기 위하여 필요한 조건과 사례를 검토하고 공간구성의 현황과 문제점을 도출하여 해결대안이 될 수 있는 공간요소의 재구성을 통해 효율적인 운영을 위한 공간구성체계를 제시하는 것을 목적으로 한다. 따라서 본 연구에서는 급증하는 도서관의 조립과 리모델링 사업계획에서 참고할 수 있도록 도서관의 특성과 서비스 규모에 상응하는 합리적인 공간운영 표준모델의 개발을 위해, 첫째, 국내 공공도서관 공간구성 현황을 조사 분석하고 둘째, 국내 및 해외의 도서관 건축물 공간구성 사례 수집분석하며, 셋째, 향후 신축할 국내 공공도서관 건축물을 유형별로 정의하여 공간구성에 대한 합리적인 권장모델을 개발하여 제시하고자 한다.

• 한국문헌정보학회지
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• 제4권
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• pp.43-71
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• 1975

Operations research has developed rapidly since its origins in World War II. Practitioners of O. R. have contributed to almost every aspect of government and business. More recently, a number of operations researchers have turned their attention to library and information systems, and the author believes that significant research has resulted. It is the purpose of this essay to introduce the library audience to some of these accomplishments, to present some of the author's hypotheses on the subject of library management to which he belives O. R. has great potential, and to suggest some future research directions. Some problem areas in librianship where O. R. may play a part have been discussed and are summarized below. (1) Library location. It is usually necessary to make balance between accessibility and cost In location problems. Many mathematical methods are available for identifying the optimal locations once the balance between these two criteria has been decided. The major difficulties lie in relating cost to size and in taking future change into account when discriminating possible solutions. (2) Planning new facilities. Standard approaches to using mathematical models for simple investment decisions are well established. If the problem is one of choosing the most economical way of achieving a certain objective, one may compare th althenatives by using one of the discounted cash flow techniques. In other situations it may be necessary to use of cost-benefit approach. (3) Allocating library resources. In order to allocate the resources to best advantage the librarian needs to know how the effectiveness of the services he offers depends on the way he puts his resources. The O. R. approach to the problems is to construct a model representing effectiveness as a mathematical function of levels of different inputs(e.g., numbers of people in different jobs, acquisitions of different types, physical resources). (4) Long term planning. Resource allocation problems are generally concerned with up to one and a half years ahead. The longer term certainly offers both greater freedom of action and greater uncertainty. Thus it is difficult to generalize about long term planning problems. In other fields, however, O. R. has made a significant contribution to long range planning and it is likely to have one to make in librarianship as well. (5) Public relations. It is generally accepted that actual and potential users are too ignorant both of the range of library services provided and of how to make use of them. How should services be brought to the attention of potential users? The answer seems to lie in obtaining empirical evidence by controlled experiments in which a group of libraries participated. (6) Acquisition policy. In comparing alternative policies for acquisition of materials one needs to know the implications of each service which depends on the stock. Second is the relative importance to be ascribed to each service for each class of user. By reducing the level of the first, formal models will allow the librarian to concentrate his attention upon the value judgements which will be necessary for the second. (7) Loan policy. The approach to choosing between loan policies is much the same as the previous approach. (8) Manpower planning. For large library systems one should consider constructing models which will permit the skills necessary in the future with predictions of the skills that will be available, so as to allow informed decisions. (9) Management information system for libraries. A great deal of data can be available in libraries as a by-product of all recording activities. It is particularly tempting when procedures are computerized to make summary statistics available as a management information system. The values of information to particular decisions that may have to be taken future is best assessed in terms of a model of the relevant problem. (10) Management gaming. One of the most common uses of a management game is as a means of developing staff's to take decisions. The value of such exercises depends upon the validity of the computerized model. If the model were sufficiently simple to take the form of a mathematical equation, decision-makers would probably able to learn adequately from a graph. More complex situations require simulation models. (11) Diagnostics tools. Libraries are sufficiently complex systems that it would be useful to have available simple means of telling whether performance could be regarded as satisfactory which, if it could not, would also provide pointers to what was wrong. (12) Data banks. It would appear to be worth considering establishing a bank for certain types of data. It certain items on questionnaires were to take a standard form, a greater pool of data would de available for various analysis. (13) Effectiveness measures. The meaning of a library performance measure is not readily interpreted. Each measure must itself be assessed in relation to the corresponding measures for earlier periods of time and a standard measure that may be a corresponding measure in another library, the 'norm', the 'best practice', or user expectations.