• 한국정밀공학회지
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• 제19권4호
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• pp.168-178
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• 2002

The CNC machine toots has two kinds of fault. One is the fault due to degraded parts and the other is the fault due to operation disability. The phenomena of degradation is predictable but the operational fault is unpredictable because it occurred without any warning. The major faults of CNC machine tool are operational faults which are charged over 70%. This paper describes the model of remote service and the intelligent fault diagnosis system to diagnosis operational faults of CNC machine tools. To generalize fault diagnosis, two diagnosis models such as SF(Switching Function) and SSF(Step Switching Function) are proposed. The SF is static model and SSF is dynamic model for expression of fault. The SF and SSF model can be generated using SFG(Switching Function Generator) which is developed in this research. The three major operational faults such as emergency stop error, cycle start disability and machine ready disability are applied to experiment of fault modeling. To remote service of faults fur CNC machine tool, the web server and client system based internet are proposed as the suitable environment. The developed two technologies are implemented with the internal function of open architecture controller. The implemental results for two technologies are presented to validate the proposed scheme.

• 의료법학
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• 제8권2호
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• pp.69-118
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• 2007

In providing general medical treatments, the medical service contract between the patient and the doctor is the mutually responsible onerous contract. However, the nature of the mutually assumed contract standings of the patient and the doctor has been changing since the implementation of the national health insurance program. For instance, besides the cases of beyond excessive medical charges and medical negligence, if the doctor charged for his/her medical treatments violating the post-treatment/nursing cover criteria, the overpaid medical charge, regardless of being collected with the patient's consent, has to be refunded back to the patient. Medically needed aspects, treatment results, and unfair benefits favoring the patient are not at all taken into consideration in the health insurance scheme. This makes it easier for patients to get refunds for their share of the medical payments by involving the Health Insurance Review & Assessment Service or the National Health Insurance Corporation, without engaging in civil law suits (for reimbursement claim) against doctors. In other words, the doctor's responsibility to provide medical treatments and the patient's responsibility to pay for the medical treatment provided within the contractual realm are being demolished by the administrational arbitration of the National Health Insurance system. The basic rights of medical service providers, and the patient's right to choose are as important constitutional rights, as the National Health Insurance program, which is essential in the social welfare system. Furthermore, the development of the medical fields should not be prevented by the National Health Insurance system. If the medical treatment services can be divided into necessary treatments, general treatments, and high quality treatments, the National Health Insurance is supposed to guarantee the necessary and general treatments to provide medical treatments equally to all the insured with limited financial resources. However, for the high quality treatments, it is recommended that they should not be interfered by the National Health Insurance system, and that they should be left to the private contract between the patient and the doctor.

• 한국데이타베이스학회:학술대회논문집
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• 한국데이타베이스학회 1997년도 International Conference MULTIMEDIA DATABASES on INTERNET
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• pp.376-392
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• 1997

요즘 우리는 정보의 바다라고 불리는 인터네트 때문에 엄청난 변화의 소용돌이에 휩싸이고 있다. 이 인터네트 세계에는 밤낮없이 새로운 정보와 다양한 사고가 넘쳐나고 있으며, 인터네트를 이용한 정보확산은 국가간 국경을 무색하게 하고 있으며 이로 인해 새로운 서비스 사업 기회가 펼쳐지고 있다. 인터네트 서비스의 발전 단계를 살펴보면 인터네트 접속서비스를 위한 Infra 구축단계 그리고 인터네트 Web 구축 제공 사업 등 발전 단계를 거쳐 전자상거래, 그룹웨어 각종 응용서비스 등 컨텐트 (Contenr) 사업의 안정화 단계로 나눌 수 있는데 국내의 경우 모든 단계가 동시에 급성장하고 있다. Web DB의 유료화는 컨텐트 사업 활성화를 위해서는 필수적인 사항으로 이 분야의 기술 개발은 매우 중요한 의미를 가지고 있다. 본 원고에서는 응용서비스의 기본이 되는 Web DB의 유료화 흐름과 최근 한국통신에서 개발되고 있는 유료화 정책인 웹인포샵 서비스에 대한 일부 기술적인 내용을 서술하고자 한다. 본 원고의 일부는 주요 정보통신 신문의 내용을 인용하였음을 밝혀 둔다.

• 한국경영과학회:학술대회논문집
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• 대한산업공학회/한국경영과학회 1996년도 춘계공동학술대회논문집; 공군사관학교, 청주; 26-27 Apr. 1996
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• pp.328-332
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• 1996

B-ISDN is expected to be a main vehicle of future telecommunications. There has been a series fo studies on the demand and the market prospect of B-ISDN services. It is true, however, that they lacked some economic reality since the price of services has been overlooked which is a critical economic factor. In this study, we analyze some aspects of the tariff system of B-ISDN services. First, we explore and summarize the billing parameters of B-ISDN services from diverse characteristics of services and ATM network. These parameters are essential if the services are to be charged based on usage. Secondly, we discuss what factors be considered in the design fo B-ISDN services tariff systems from various points of view shch as traffic charactristics, information types and connection types, etc. The results of this study will offer fundamental insights in the design of B-ISDN service pricing scheme and provide reference for efficient services providing.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2003년도 추계학술대회 논문집(II)
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• pp.365-371
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• 2003

In this study, market strategies for the HSR's fare system are suggested for successful operation of high speed train opened in April 2004. For price strategies, we suggested HSR's fare system considered competition with other transportation modals are supposed to be charged and some discount-fare policies compared to service distances are needed for the successful operation of high speed train after the train open. In addition, this study concludes that for non-price strategies, various services for customers driving for enough demand can provide the base for stable operation of high speed train in Korea by making balances or profitability.

• 한국경영과학회지
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• 제27권4호
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• pp.139-147
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• 2002

In this paper, a mathematical model was introduced to analyze pricing and quality strategies for the web sites of electronic intermediaries. Especially, I focused on the intermediary sites that initiate their businesses by providing free services such as free e-mail, search, and directory services. intermediaries may gather third party providers looking for new markets for their services, based on customers who want to use the free services. And intermediaries provide charged intermediary services to both of customers and providers. By analyzing the mathematical model, I can find optimal quality and prices to maximize the profit of intermediaries. And I can found also that intermediaries should make efforts to improve their productivity of developing their services to make profits.

• 한국항행학회논문지
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• 제19권6호
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• pp.601-606
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• 2015

최근 무선 데이터 서비스는 스마트폰을 중심으로 다양한 멀티미디어 기기들로 확산되고 있다. 무선 데이터 서비스는 과거 유선망을 기반으로 하는 데이터 서비스에서 모바일 기기를 이용한 무선 데이터 서비스로 대체되고, 특히 국내에서는 Wi-Fi (Wireless-Fidelity) 서비스 와 LTE (long term evolution) 서비스를 동시에 지원하는 단말기가 증가하고 있다. 현재 Wi-Fi 서비스망을 이용한 데이터 서비스는 무료로 제공되며, LET 망을 이용한 데이터 서비스는 유료로 제공 된다. 따라서 하나의 단말이 두 서비스를 동시에 지원하기 위해서 Wi-Fi 서비스를 우선순위로 하는 스마트 전환 기능을 제공하고 있다. 하지만 하나의 단말이 두 가지 서비스 지원을 위해 Wi-Fi 망과 LTE 망 사이에서 로밍과 핸드오버를 수행하는 과정 중 데이터 서비스가 멈추는 문제가 빈번히 발생되고 있다. 본 논문에서는 끊김 없는 무선데이터 서비스 지원을 위해 망과 망 전환 시 발생되는 데이터 서비스의 끊김 현상을 해결하기 위한 방법을 제안하였다.

• 한국항해항만학회지
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• 제44권4호
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• pp.347-353
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• 2020

항로표지는 선박에게 위치정보 등 다양한 정보를 제공함으로써 해양사고 예방 및 해양환경 보호 등에 기여하고 있다. 이러한 항로표지의 중요성을 인식하여 무역항을 입출항하는 선박에 톤당 24원의 항로표지이용료가 징수되고 있다. 그러나 24원의 항로표지이용료는 1999년에 책정된 이후 현재까지 유지되어 오고 있는 반면, 해운 및 항만 4.0 시대변화에 따라 자율운항 선박 및 스마트 항만운영 등을 위한 항로표지의 새로운 역할에 대한 수요는 점점 증가하고 있다. 따라서 본 연구의 목적은 이러한 해운 및 항만산업의 변화에 따른 적정한 항로표지이용료의 추정에 있으며, 이를 위해 평택청을 대상으로 총괄원가를 회수하는 방법을 도입하였다. 항로표지이용료 추정은 연도별 및 누적환산 연도별 2가지와 항로표지이용료 징수대상이 무역항 이용 선박임으로 평택청의 항로표지를 전체와 대상 항로표지로 구분한 총 4가지 경우로 추정하였다. 추정결과 평택청의 항로표지이용료는 53.78-71.62원(2019년 기준)으로 현재 24원보다 29.78-47.62원이 높게 추정되어 인상이 필요하였다. 이러한 연구결과는 항로표지의 역할을 고려한 관련 예산 운영과 정책 운용에 유용한 기초자료로 활용될 수 있을 것이다.

• 대한지역사회영양학회지
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• 제9권5호
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• pp.615-628
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• 2004

This study is designed to examine influences of living arrangements on psycho-social factors, health and nutritional status, dietary adequacy and meal service utility patterns of the elderly. Nutritional status was evaluated by Mini Nutritional Assessment (MNA). Three hundred and nine elderly (110 men and 199 women) who participated in meal service in the Chung-buk province were investigated. Proportion of the elderly living alone, couples only, living with spouse and family, living with family without spouse; and living with other than family were 30.7%, 25.9%, 14.2%, 24.3% and 4.9% respectively. The mean age of the elderly was 74.1 years and the elderly who are living couples only and living with spouse and family were younger than those with other living status. Living arrangements seem to be related to psycho-social factors, health and nutritional status, and dietary quality. Those who live alone and live with other than family were mostly women and they have lower socio-economic status, psycho-social, health and nutritional status and dietary patterns compared with those of the elderly who are living with spouse or family. It was found that the elderly who live a couple only and live with spouse and family had better emotional, health and nutritional index than those of the elderly who live with family without spouse, especially in case of females. Most of elderly perceived that participation of meal service programs had a positive effect on their daily life and satisfied with meals. The elderly living alone and living with other than family were more frequently using meal service but had a negative attitude about the charged meal service for better quality than the elderly with other living status. The most important reason for all the elderly to participate in meal service was to meet their friends and then to get other services. Particularly those who are living alone and living with other than family showed lack of moivation to prepare and set the meal, and for them the economic reason is also important. They also replied that the poor health and lack of other help were the most difficult problems for them to prepare meals. It would be effective to provide nutritional services that meet specific needs of the elderly according to their characteristics and living environment.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2000년도 하계종합학술대회 논문집(3)
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• pp.97-100
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• 2000

As network resources have become faster and demands for multimedia service through network have increased, the demand for Media server system has increased. These kinds of media server solve their bottle neck problem of internal storage device by using parallel system which takes advantage of fast network resource. Many vendors have suggested each of their media server system to solve these problem radically, but most of them require major modification of infra component and additional drawback has added. For example, storage mechanism for specific media requires new file system which is totally different from traditional one, and algorithm for enhancing performance may not suit for traditional operating system environment. In this paper, we designed a parallel media server based on web interface of traditional system and implemented a program for media server. Implemented server system performs parallel processing through web interface without any modification of traditional system, and controls which is related to merging load by distributed data is charged only to client and control server and consequently load of storage server can be minimized. And also, data transfer protocol for streaming media includes Retransfer algorithm and client Admission control policy relevant to performance of whole system.