• 전자통신동향분석
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• 제38권3호
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• pp.66-77
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• 2023

Governments intend to use the public warning system to deliver timely and accurate information using accessible communication technologies for protecting the population and reducing damage to life and property. In particular, many countries implement system interworking with smartphones to notify of disasters or emergencies. In Korea, since 2020, due to the influence of the coronavirus disease, frequent emergency text messages led people to turn off related notifications, and complaints for receiving irrelevant messages from nearby warning areas have increased. Therefore, technical improvements for issuing more accurate disaster information to a specific region should be devised through a geography-based emergency disaster message transmission service. We analyze development trends of public warning systems and service cases of geography-based emergency text transmission services in various countries.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2002년도 ITC-CSCC -2
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• pp.1105-1108
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• 2002

Real-time(RT) object-oriented(OO) distributed computing is a form of RT distributed computing realized with a distributed computer system structured in the form of an object network. Several approached proposed in recent years for extending the conventional object structuring scheme to suit RT applications, are briefly reviewed. Then the approach named the TMO(Time-triggered Message-triggered Object)structuring scheme was formulated with the goal of instigating a quantum productivity jump in the design of distributed time triggered simulation. The TMO scheme is intended to facilitate the pursuit of a new paradigm in designing distributed time triggered simulation which is to realize real-time computing with a common and general design style that does not alienate the main-stream computing industry and yet to allow system engineers to confidently produce certifiable distributed time tiggered simulation for safety-critical applications. The TMO structuring scheme is a syntactically simple but semantically powerful extension of the conventional object structuring approached and as such, its support tools can be based on various well-established OO programming languages such as C＋＋ and on ubiquitous commercial RT operating system kernels. The Scheme enables a great reduction of the designers efforts in guaranteeing timely service capabilities of application systems.

• 디지털산업정보학회논문지
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• 제7권3호
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• pp.123-136
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• 2011

Arts gains a new relation as the new academic area that deals with living organisms and through this technology, it affects everything, such as the body, entity, consciousness and unconsciousness to bring an overall change. Based on this premise, arts require a different interpretation from the previous product-focused interpretation or the analysis focusing on the aesthetics. As the result of arts using the scientific methods, I examined the changes of the arts semantics and how it evolved with what kind of contents and characteristics. The net art with the internet base also form a close relationship with the social and cultural codes. In categorizing the social issues and the topical discussions with semantic factors that evolve from the digital biological perspective, it can be divided into four types of complex interaction, positive feedback negative feedback, and amplification of unsettledness. Based on the characteristics of the multimedia and the interactive reaction, the technique and the imagery amplify the message through a spatial and timely meeting in a mutual repletion. In other words, the emotional communication is used to attempt the messages from the products and the expression in various methods.

• 한국항행학회논문지
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• 제24권4호
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• pp.267-272
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• 2020

선박의 상태를 공간 제약 없이 광범위하게 측정하고 이를 정밀히 분석하기 위한 수단들 중 하나로 무선 네트워크의 활용이 하나의 방법이 될 수 있다. 여러 개의 센서들을 적절한 곳에 배치하고 이들 간 네트워크가 자동으로 구성이 되고나면 선박의 상태를 한 장소에서 모니터링 할 수 있다. 아울러 배치된 모든 센서들이 동일한 시각정보를 갖는다면, 이들로부터 감지된 동일한 이벤트에 대하여 위치 또는 이동방향 등도 알아낼 수 있다. 따라서 동기화된 센서들의 활용은 메타정보의 생산을 위한 중요한 요소가 될 수 있다. 이 논문은 선박에서의 효율적 활용을 위한 센서 간 시각동기 알고리즘을 제안한다.

• 한국군사과학기술학회지
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• 제24권2호
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• pp.187-196
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• 2021

The Network-Centric warfare over weapon data link networks has been developed for the recent decade. Since the US navy had begun to develop tactical digital information chain, it has gradually transformed into weapon data link technology. As data link network system and its protocol have been advanced into high-technology, focusing and targeting on moving targets become possible in net-enabled environments. However, it is difficult to identify the primary information from numerous battlefields and understanding approaches to damage a target in a timely manner. In this paper, to better understand the targeting assessment, we suggest a specific solution: Bomb Hit Indication(BHI) using information in weapon data link messages. In order to prove our suggestion, we implement the BHI solution and apply it into the weapon data link integrating system.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2006년도 International Symposium on GPS/GNSS Vol.2
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• pp.9-14
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• 2006

Galileo is the European Global Navigation Satellite System, under civilian control, and consists on a constellation of medium Earth orbit satellites and its associated ground infrastructure. Galileo will provide to their users highly accurate global positioning services and their associated integrity information. The elements in charge of the computation of Galileo navigation and integrity information are the OSPF (Orbit Synchronization Processing Facility) and IPF (Integrity Processing Facility), within the Galileo Ground Mission Segment (GMS). Navigation algorithms play a key role in the provision of the Galileo Mission, since they are responsible for computing the essential information the users need to calculate their position: the satellite ephemeris and clock offsets. Such information is generated in the Galileo Ground Mission Segment and broadcast by the satellites within the navigation signal, together with the expected a-priori accuracy (SISA: Signal-In-Space Accuracy), which is the parameter that in fault-free conditions makes the overbounding the predicted ephemeris and clock model errors for the Worst User Location. In parallel, the integrity algorithms of the GMS are responsible of providing a real-time monitoring of the satellite status with timely alarm messages in case of failures. The accuracy of the integrity monitoring system is characterized by the SISMA (Signal In Space Monitoring Accuracy), which is also broadcast to the users through the integrity message.

• 한국콘텐츠학회논문지
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• 제17권10호
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• pp.503-517
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• 2017

최근 다큐멘터리 영화의 대중적 성공작들이 나타남에 따라 그 요인에 대한 관심이 대두되고 있다. 이에 본 연구는 보편적 메시지로 대중성을 확장한 <님아, 그 강을 건너지 마오>와 강한 정치적 메시지를 담은 <두 개의 문>의 사례를 통해 다큐멘터리 영화의 흥행요인을 규명하고자 했다. 이를 위해 Litman and Kohl(1989)이 제시한 영화 흥행요인 구분인 창조적 영역, 배급유통영역, 마케팅 영역을 기준으로 두 영화의 제작, 배급 담당자들의 인터뷰를 기반하여 사례분석을 이루었다. 분석결과, 강렬한 인물이나 사건 등의 실화 소재, 영화의 참신한 시선과 메시지, 영화적 완성도, 영화성격에 맞는 배급전략, 시의적 시기에 상영, 적절한 홍보, 광고 전략이 두 영화의 공통된 흥행요인임을 확인할 수 있었다. 이외에도 <님아, 그 강을 건너지 마오>는 민간투자로 인해 배급과 마케팅 비용이 풍부했던 점과 와이드릴리즈배급전략이 유효했고, <두 개의 문>은 정부의 개봉지원과 그리고 참여관객이라는 특수한 요인이 흥행에 영향을 미쳤음을 알 수 있었다. 이와 같이 본 연구는 다큐멘터리 영화의 흥행 요인을 규명하고, 이에 따른 전략적 작용에 대한 방안을 구체적으로 도출함으로써 다큐멘터리 영화의 대중화를 위한 시사점을 제시하고자 했다.

• 한국대기환경학회지
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• 제21권6호
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• pp.573-583
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• 2005

Fugitive dust, which is emitted in the ambient air without first passing through a stack or duct designed to control flow, is frequently generated by means of wind erosion from storage yards at Pohang Steel Wokrs. The size distribution of fugitive dust is mostly in the range of coarse particulate which is deposited as soon as emitted and less harm to human health; however $20\%$ of fugitive dust contains PM 10 known as one of most harmful airborne pollutant. Consequently, effective control and reduction of fugitive dust is strongly requested by the local society, but it is not easy so far because the generation and dispersion of fugitive dust highly depends on meteorological conditions, and it being occurred for irregularity. This research presented a fugitive dust control system for each meteorological condition by providing statistical prediction data obtained from a statistical analysis on the probability of generating the threshold velocity at which the fugitive dust begins to occur, and the frequency occurring by season and by time of the wind direction that can generate atmospheric pollution when the dispersed dust spreads to adjacent residential areas. The research also built a fugitive dust detection system which monitors the weather conditions surrounding storage yards and the changes in air quality on a real-time basis and issues a warning message by identifying a situation where the fugitive dust disperses outside the site boundary line so that appropriate measures can be taken on a timely basis. Furthermore, in respect to the spraying of water to prevent the generation of fugitive dust from the storage piles at the storage yard, an advanced statistical meteorological analysis on the weather conditions in Pohang area and a case study of fugitive dust dispersion toward outside of working field during $2002\∼2003$ were carried out in order to decide an optimal water-spraying time and the number of spraying that can prevent the origin of fugitive dust emission. The results of this research are expected to create extremely significant effects in improving surrounding environment through actual reduction of the fugitive dust produced from the storage yard of Pohang Steel Works by providing a high-tech warning system capable of constantly monitoring the leakage of fugitive dust and water-spray guidance that can maximize the water-spraying effects.

• 한국정보과학회논문지:데이타베이스
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• 제35권4호
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• pp.307-318
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• 2008

XML 메시지 중계기에서의 주요 이슈들 중 하나는 XML 스트림에 대한 다중 연속 XPath질의를 효율적으로 처리하는 방안이다. 본 연구는 이 문제를 효과적으로 해결하기 위한 시스템을 제안한다. 제안되는 시스템에서는 XPath 질의집합을 XP-table이라는 새로운 영역 기반 데이터 구조로 변환한다. XP-table은 대상 질의들의 공통적인 선택조건들을 공유하며, 실행시간 질의 수행 전에 구축된다. XML 스트림은 XP-table과의 효율적 매칭을 위해 스트림 릴레이션(SR)으로 실행시간에 변환된다. 제안된 시스템에서는 XML의 구조적 특성을 반영한 XP-table과 SR 간의 효과적인 매칭 전략이 제시된다. 또한, YFilter나 LazyDFA와 같은 기존 방법론과의 비교를 포함한 일련의 실험들을 통해, 제안 시스템이 질의 처리의 실행시간 부하를 줄임으로써 시간 효율성이 중요한 스트림 환경에서의 안정적 데이타 처리 능력을 보여준다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제16권2호
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• pp.445-466
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• 2022

As everything linking to the internet, people can subscribe to various services from a service provider to facilitate their lives through the Internet of Things (IoT). An obligatory thing for the service provider is that they should push the service data safely and timely to multiple IoT terminal devices regularly after the IoT devices accomplishing the service subscription. In order to control the service message received by the legal devices as while as keep the confidentiality of the data, the public key encryption algorithm is utilized. While the existing public encryption algorithms for push service are too complicated for IoT devices, and almost of the current subscription schemes based on push mode are relying on centralized organization which may suffer from centralized entity corruption or single point of failure. To address these issues, we design a secure subscription-push service scheme based on blockchain and edge computing in this article, which is decentralized with secure architecture for the subscription and push of service. Furthermore, inspired by broadcast encryption and multicast encryption, a new encryption algorithm is designed to manage the permissions of IoT devices together with smart contract, and to protect the confidentiality of push messages, which is suitable for IoT devices. The edge computing nodes, in the new system architecture, maintain the blockchain to ensure the impartiality and traceability of service subscriptions and push messages, meanwhile undertake some calculations for IoT devices with limited computing power. The legalities of subscription services are guaranteed by verifying subscription tags on the smart contract. Lastly, the analysis indicates that the scheme is reliable, and the proposed encryption algorithm is safe and efficient.