• 기술혁신연구
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• 제8권2호
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• pp.97-117
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• 2000

TOEM strategy is widely used in Japan and Korea because of the diverse advantages such as cost sharing, technology transfer, equipment lease and base technology acquisition between parent company and OEM supplier. There are, however, some disadvantages that (1)OEM suppliers are likely to be reactive to environmental changes and (2) may have difficulty in building competitive position and long-term growth. When the parent company relocates its plant to foreign countries to achieve lower labor cost or to enhance value added this change will affect directly the OEM supplier's outcome. The parent company's divestiture from existing businesses will also affect the OEM supplier. For the OEM supplier to survive in face of these strategic changes it must enter the new countries with the parent company. Alternatively, the OEM supplier must actively diversify its technologies based on its core capabilities of existing product and process technologies and seek new business arenas. The strategy of aligning its businesses with the parent company's new business strategy allows the OEM supplier to share the new market while it requires the OEM supplier to develop core capabilities. In Korea many small and medium sized OEM suppliers are dependent on a few large companies. For the industry structure in Korea where industry concentration is extremely high OEM suppliers should move away from the past strategy, where they are dependent on the parent company's low profitability businesses. They should actively enter new businesses for which parent companies enter to achieve long-term growth.

• 인터넷정보학회논문지
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• 제12권1호
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• pp.111-118
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• 2011

인터넷 웹페이지나 XML 등을 통해 정보를 공유할 때, 친숙한 정보항목 명칭은 사용자 간에 혼동을 최소화한다. 친숙한 단어를 선택하기 위해 언어 전문가의 의견을 구하는 경우 비용과 시간이 소모되지만, 자동화된 지표는 별도의 비용 없이 참고정보를 제공하여 사용자가 친숙한 단어를 선택하도록 돕는다. 본 논문은 사용자가 인터넷에서 쉽게 접할 수 있는 지표를 수집하여, 친숙한 단어를 선택하는데 사용 효과를 비교 조사하였다. 수집된 지표는 단어 길이, 관련 사이트에 사용되는 빈도, 검색 사이트에서 결과 건수이다. 관련 사이트에 사용되는 빈도에 의해 선택된 단어가 여성의 것과 최고 76%, 남성의 것과 최고 71% 매칭 되는 것으로 나타나, 참고 지표로 사용 가능한 것으로 결과가 나타났다.

• 대한가정학회지
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• 제30권3호
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• pp.285-305
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• 1992

The purpose of this study was to describe the current status of dual-earner families in Seoul. The specific aims of this study were to examine the dynamics of marital relationship, parent-child relationship and old mother-daughter/daughter in law relationship in the same family. The sample consised of 265 dual-earner families was selected based on wives' jobs, primarily non-professional. The information was gathered from working couples and their school-aged children. The findings of this study were as follows: 1. Sex role attitude of husbands was more traditional than their wives. Therefore, housework sharing of husbands was very low and wives' perception of inequity was high. Wives' marital satisfaction was affected by the wives' perception of inequity, joint leisure activity, sexual satisfaction, and wives' job satisfaction. Husbands' marital satisfaction was affected by sexual satisfaction, perceived difficulties and problems of the husbands caused by wives' employment, and the degree of their housework participation. 2. The emotional uneasiness of children during mothers' absence was reported. The communication about mothers' job was helpful to gain children's understanding toward mothers' job. Mothers suffered from guilty feeling of neglecting their children in spite of their good performance of mothering role. 3. The employed daughters/daughters in law perceived high rewards and low cost in relationships with their mothers/mothers in law. The perceived quality of daughter-mother relationship was higher with low cost and high rewards than that of daughter in law/mother in law. Finally practical and policy implications were suggested.

• 한국전자거래학회지
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• 제2권2호
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• pp.89-113
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• 1997

Modeling methodology has been widely used for analysis and design of a information system. Specially, under the CALS environments, modeling approach is more important because the enterprise functions are inter-related and information sharing speeds up the business. In this paper, we suggest functional requirements about modeling methodology for CALS by surveying the IDEF0 and ARIS. The former is FIPS 183 and the latter is basic methodology of SAP/R3 which is world-wide ERP system. The proposed functional requirements include all semantics of IDEF0 and adds some features. The first is adding modeling components which are semantic representations. In addition to ICOMs, we add the time and cost component which is required to execute the function. The second is tracing mechanism. When we need some information, we drive the functions related with the information by reverse tracing of the function which produces the information as a output and input. Through the tracing, we find out the bottleneck process or high cost process. This approach guarantees the integrity of data by designating the data ownership. Finally, we suggest the final decomposition level. We call the final decomposed function into unit function which has only one output data. We can combine and reconstruct some of functions such as 'lego block' combination.

• 융합보안논문지
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• 제15권5호
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• pp.9-15
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• 2015

클라우드 컴퓨팅은 서버의 추가 구축에 대한 비용절감, 데이터 스토리지 확대에 대한 비용 절감, 컴퓨터 자원에 대한 공유, 새로운 기술의 적용에 대한 편의성 등의 장점을 가지고 있다. 그러나 서비스 모델의 다양성으로 인하여 새로운 보안의 우려사항이 높아지고 있어, 이용자가 서비스의 안정성을 신뢰할 수 있도록 인증제도가 운영되고 있다. 이에 본 논문에서는 인증제도의 신뢰성을 확보하기 위해 기존 IT환경에서 적용되던 위험 분석 방법과 달리 공공 IaaS(Infrastructure as a Service) 클라우드 서비스 특징을 고려, 새로운 위험분석 방법을 제안한다.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2013년도 춘계학술발표대회
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• pp.695-697
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• 2013

Medical data sharing is increasing due to treatment duplication which increases the cost of medication. Medical healthcare system has been improved to combine with cloud computing. It reduces treatment delay and the medical data error. However, the concern about the privacy protection of medical information is also significant. Medical information is more sensitive than other information because involuntary disclosure can affect in both personal and social life. Privacy cloud brokerage has conquered great attention for solving these problems. Our method provides a security model in the cloud computing environment that facilitates the exchange of medical records between assigned custodians. It allows doctors to obtain a complete patient medical records which can help to avoid duplication, reduce the medical error and healthcare cost as well. In addition, our method offers a trustworthy solution against the privacy violence.

• KNOM Review
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• 제22권1호
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• pp.30-41
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• 2019

MQTT 프로토콜은 IoT 정보 전송을 위한 오픈 Publish / Subscribe 시스템 중 하나이다. 본 논문에서는 MQTT 클러스터링 시스템에 동적으로 참여하는 가입자를 적절한 브로커에 배정하는 알고리즘을 제안한다. 중앙 집중식 브로커가 있는 MQTT 시스템에서는 가입자와 중개자 간의 연결 및 메시지 손실이 발생한다. 이 논문에서는 확장 가능한 개방형 IoT 시스템을 개발하고 SDN 인프라에서 MQTT 브로커 클러스터링을 고려하여 이 문제를 해결한다. 특히 이 논문은 SDN 기반 MQTT 클러스터에서 브로커의 부하 및 통신비용을 줄이기 위해 브로커의 주제 공유에 따라 브로커에 가입자를 할당하는 문제에 중점을 둔다. 실험 결과는 제안 된 알고리즘이 기존의 방법에 비해 부하 및 비용을 감소시킴을 보여준다.

• International Journal of Computer Science & Network Security
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• 제24권6호
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• pp.33-40
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• 2024

Introducing renewable energy sources, such as wind and photovoltaic arrays, in microgrids that supply remote regions with electricity represents a significant leap in electricity generation. Combining photovoltaic panels and diesel engines is one of the most common ways to supply electricity to rural communities. Such hybrid systems can reduce the cost of electricity generation in these remote power systems because they use free energy to balance the power generated by diesel engines. However, the combination of renewable energy sources and diesel engines tends to complicate the sizing and control of the entire system due to the intermittent nature of renewable energy sources. This study sought to investigate this issue in depth. It proposes a robust hybrid controller that can be used to facilitate optimum power sharing between a PV power source and diesel generators based on the dynamics of the available PV energy at any given time. The study also describes a hybrid PV-diesel power plant's essential functional parts that produce electricity for a microgrid using a renewable energy source. Power control needs to be adjusted to reduce the cost of power generation.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제18권6호
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• pp.1599-1618
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• 2024

Access control has always been one of the effective methods to protect data security. However, in new computing environments such as big data, data resources have the characteristics of distributed cross-domain sharing, massive and dynamic. Traditional access control mechanisms are difficult to meet the security needs. This paper proposes CACM-MMSR to solve distributed cross-domain access control problem for massive resources. The method uses blockchain and smart contracts as a link between different security domains. A permission decision model migration method based on access control logs is designed. It can realize the migration of historical policy to solve the problems of access control heterogeneity among different security domains and the updating of the old and new policies in the same security domain. Meanwhile, a semantic reasoning-based permission decision method for unstructured text data is designed. It can achieve a flexible permission decision by similarity thresholding. Experimental results show that the proposed method can reduce the decision time cost of distributed access control to less than 28.7% of a single node. The permission decision model migration method has a high decision accuracy of 97.4%. The semantic reasoning-based permission decision method is optimal to other reference methods in vectorization and index time cost.

• 한국건설관리학회논문집
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• 제13권4호
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• pp.100-109
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• 2012

도로사업현장의 특징은 인접 공구간 비슷한 공종과 공기를 가지고 유사한 장비 자원을 사용하는 다(多)공구 현장이라는 것이다. 그러나 현재 도로현장들은 각 공구의 개별 기성에 취중한 '칸막이식' 운영에 의해 지속적으로 수급불균형상태가 발생하여 고가의 장비들이 비효율적으로 운영되는 것으로 드러났다. 본 연구에서는 다공구현장 내의 장비들을 적시적소에 공구간 공유하여 전체 사업의 자원 활용도를 높일 수 있는 자원공유시스템을 정립하고자 한다. 본 논문은 그 첫 단계로써 도로사업현장에서 장비의 생산성과 그 운영 실태에 대한 연구내용을 중점적으로 소개한다. 현장의 자원운영실태 파악을 위한 설문을 통해서 다공구 도로현장의 자원공유시스템 도입에 필요한 공유적합자원표를 얻었으며, 다공구 현장의 자원활용도 측정을 위해서는 계획편차(DPR), 정규화계획편차(nDPR), 수급불균형지수(SDI)등의 공식을 새롭게 고안하였다. 이들 공식을 실제 도로현장의 작업일지 데이터에 적용하였으며, 그 결과 각 공구별 nDPR값과 SDI값을 얻었다. 분석결과 도로사업현장의 자원운영은 추가임대와 유휴자원이 계속적으로 발생하는 비효율적인 운영임을 파악하였다. 또한 공구별로 부족/유휴 상태가 골고루 발생하여 공구간 장비를 공유할 경우 상쇄효과를 통해 장비의 생산성이 높아질 것을 간접적으로 파악할 수 있었다. 본 논문에서 도출된 결과들은 추후 자원공유시스템 정립의 기초자료로 활용 가능할 것으로 판단된다.