• KSII Transactions on Internet and Information Systems (TIIS)
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• 제6권1호
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• pp.116-130
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• 2012

Service provision and consumption platforms are more and more used to enable communication between sensors, actuators and intelligent devices, since they provide mechanisms that make possible the combination of components to create composed services. However, these kinds of platforms have limitations to adapt themselves to new and unknown devices. In this work we analyze the challenge of component or bundle communication by using the Open Services Gateway Initiative (OSGi) technology and we propose three mechanisms with the aim of contributing to flexible component communication: Common Service, Specific Service and WSIF Web Service Invocation. We provide these solutions with some architectural models and validate them through different example services. Finally we compare them regarding performance, flexibility and application complexity.

• 한국정보통신학회논문지
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• 제12권7호
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• pp.1321-1328
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• 2008

본 논문에서 제안된 미들웨어는 상황인지와 이벤트 중심적인 구조에 초점을 맞춰 돈사와 같은 농업 서비스를 위한 모니터링 및 제어 시스템이다. u-Farm 미들웨어는 센서 필드로부터 얻어진 상황정보를 모니터링하고 처리함으로써, 농업 애플리케이션 서비스로부터의 다양한 쿼리에 대하여 즉각적인 응답을 제공한다. 이러한 시스템은 제어 장치로 하여금 최적의 유비쿼터스 농업 환경을 제공할 수 있도록 적합한 액션을 취하게 한다.

• 한국정보통신학회논문지
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• 제12권6호
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• pp.1134-1141
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• 2008

센서네트워크 기술의 발전에 따라 그 활용 범위는 가축에까지 확대 되고 있는 추세이다. 그러나 대단위 가축에게 실시되기에는 비용이나, 효율 등에서 문제가 발생한다. 본 논문에서는 대단위로 가축의 생체 데이터 측정을 시뮬레이션을 통해 구현하였으며, 실제와 보다 유사하게 하기 위해 전파모델을 축사환경에 맞게 변경하여 시뮬레이션 하였다. 도출된 결론을 통해 축우 통제를 통한 수집 시나리오가 필요함을 알 수 있었고, 효과적인 라우팅 프로토콜의 수정도 필요함을 알 수 있었다.

• 반도체디스플레이기술학회지
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• 제9권2호
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• pp.67-72
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• 2010

Recently increasing application of flash memory in mobile and ubiquitous related devices is due to its non-volatility, fast response time, shock resistance and low power consumption. Following this trend, SSD(Solid State Disk) using multiple flash chips, instead of hard-drive based storage system, started to widely used for its advantageous features. However, flash memory based storage subsystem should resolve the performance bottleneck for writing in perspective of speed and lifetime according to its disadvantageous physical property. In order to provide tangible performance, solutions are studied in aspect of reclaiming of invalid regions by decreasing the number of erasures and distributing the erasures uniformly over the whole memory space as much as possible. In this paper, we study flash memory recycling algorithms with multiple management units and demonstrate that the proposed algorithm provides feasible performance. The proposed method utilizes the partitions of the memory space by utilizing threshold values and reconfigures the management units if necessary. The performance of the proposed policies is evaluated through a number of simulation based experiments.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2014년도 춘계학술대회
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• pp.884-885
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• 2014

The use of Radio Frequency Identification technology (RFID) in medical context enables not only drug identification, but also a rapid and precise identification of patients, physicians, nurses or any other health care related staffs. The combination of RFID tag identification with structured and secured Internet of Things (IoT) solutions enables ubiquitous and easy access to medical related records, while providing control and security to all interactions. This paper surveyed a basic security architecture, easily deployable on mobile platforms, which would allow to establish and manage a medication prescription service in mobility context making use of electronic personal health records.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2009년도 춘계학술대회
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• pp.789-792
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• 2009

As RFID technology is becoming ubiquitous, the secunty of these systems gets much attention. Its fields of usage include personal identification, supply-chain management systems, and many more. Many kinds of RFID tags are available on the market which differ both in storage, and computational capacity. Since by standard IT means all the tags have small capacities, the security mechanisms which are in use in computer networks are not suitable. For expensive tags with relatively large computational capacities many secure communication protocols were developed, for cheap low-end tags, only a few lightweight protocols exist. In this paper we introduce our solution, which is based on the least computation demanding operator, the exclusive or function. By introducing two tags instead of one in the RFID system, our scheme provides security solutions which are comparable with those provided by the lightweight protocols. In the meantime, our scheme does not demand any computational steps to be made by the ta.

• 한국안전학회지
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• 제35권6호
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• pp.46-53
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• 2020

The domestic construction industry is becoming larger, high-rise and specialized. However, safety consciousness is still staying in low levels and falling accidents are apt to rise compared to other industries. So, the new way of safety management is required for reducing of the construction falling accidents. In this paper, we evaluate appropriateness of safety management on construction sites utilizing USN using smart safery equipment. Thus, we calculate loss costs of falling accidents considering accident rates and costs of the USN using smart safery equipment installation then compare both calculated costs. This research aims to propose the method for reduction of construction accidents in addition to conventional safety control methods by analyzing the propriety of applying USN using smart safery equipment on construction sites.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2013년도 춘계학술발표대회
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• pp.964-967
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• 2013

현재에 시스템의 결함을 분석하는 안전성 분석 기법들이 여러 가지가 있다. 본 논문에서는 많은 결함 분석 기법 중에서 FTA(Fault Tree Analysis)와 FMECA(Failure Modes, Effect and Criticality Analysis)을 통하여 안전성 분석을 하고자 한다. 또한 이 두 가지 기법을 따로 사용하지 않고 전방에서 FTA 분석을 하고 후방에서 FMECA 분석을 수행하는 통합 기법을 제안한다. 이를 통해 각 기법의 단점을 최소화하고 장점을 최대화 하여 안전성 분석의 효율성을 제고하고자 한다.

• 국제학술발표논문집
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• The 3th International Conference on Construction Engineering and Project Management
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• pp.1553-1558
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• 2009

Give high priority to the technologies that can be directly applicable to the U-City development projects which are in progress by many central and local governments. Create a real world product at the end of R&D phase by testing prototypes in test-beds or test-labs. Recently, new construction technologies have been developed, but they are rarely being applied to the construction filed. In this paper, the basic design was examined so that various technologies can be selected through a test-bed, analyzed for the real situation, and applied to actual construction sites. Improve productivity of regional and urban construction exercises and improve competitiveness of related products and services using IT-based telemetering/GIS technology.

• Current Photovoltaic Research
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• 제11권1호
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• pp.1-7
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• 2023

Flexible dye sensitized photovoltaics (f-DSPVs) based on plastic substrates have attracted significant interest due to their light-weight, flexibility, and compatibility with roll-to-roll processing, as well as their potential application to ubiquitous power sources. However, f-DSPVs exhibit inferior power conversion efficiencies (PCE) compared to conventional DSPVs since the fabrication process must be conducted at a low-temperature (≤ 150℃) to prevent thermal damage of the plastic substrates, which generally results in poor interconnection between the TiO₂ nanoparticles. Numerous novel low-temperature manufacturing approaches for flexible photoanode and counter electrode have been developed. In this review, current progress on low temperature strategies for f-DSPVs technology are discussed.