• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2006.11a
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• pp.313-316
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• 2006

디지털 핑거프린팅(Digital Fingerprinting)은 기 밀 정보를 디지털 콘텐츠에 삽입하는 측면에서는 디지털 워터마킹과 동일 하다고 볼 수 있으나 저작권자나 판매자의 정보가 아닌 콘텐츠를 구매한 사용자의 정보를 삽입함으로써 콘텐츠 불법 배포자를 추적할 수 있도록 한다는 점에서 워터마킹과 차별화된 기술이다. 이러한 핑거프린팅 기술은 소유권에 대한 인증뿐만 아니라 개인 식별 기능까지 제공해야 하므로 기존의 워터마킹이 갖추어야 할 요구사항인 비가시성, 견고성, 유일성과 더불어 공모허용, 비대칭성, 익명성, 조건부 추적성 등이 부가적으로 필요하다. 본 논문에서는 행렬의 한 열을 선택 후 쉬프팅 기법을 사용 하서 사용자 정보로 조합하여 핑거프린트를 생성하였다. 이렇게 생성된 핑거프린트 정보를 2레벨 웨이블릿 변환 영역 중 LH2, HL2, HH2 부대역에 삽입하였다. 쉬프팅 정보와 도메인 개념을 사용하여 보다 많은 사용자에게 핑거프린트 정보를 삽입할 수 있으며, 공모공격과 JPEG 압축에서도 최소한 1명 이상의 공모자를 검출할 수 있는 핑거프린팅의 기본 조건을 만족하였다.

• Proceedings of the Korea Information Processing Society Conference
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• 2008.05a
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• pp.541-544
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• 2008

e-비즈니스 환경 하에서 전자적 데이터 교환 또는 WEB을 이용한 비즈니스 트랜잭션 처리를 통해 산업 부분별 자동화나 정보화가 활발히 진행되었다. 전자적으로 데이터를 처리함으로 인해 기존 오프라인을 이용한 비즈니스 환경 보다는 처리 속도나 처리 시간이 단축되었으며 비용도 많이 절감되었다. 그러나 점차 실시간적으로 데이터를 처리하거나 실시간적으로 화물에 대한 흐름을 추적하고자 하는 사용자들의 요구사항이 도출되기 시작하였다. 이에 RFID, USN 등의 유비쿼터스 개념과 기술을 이용한 u-비즈니스가 도입되어 각 분야에 활발히 적용되고 있다. 특히 유통이나 운송 등 물류 분야에 유비쿼터스 기술이 적용됨으로 실시간으로 데이터를 수집할 수 있어 화물의 흐름 추적을 용이할 수 있는 기반이 되고 있다. 본 논문에서는 새로운 비즈니스 환경에 적합하도록 EPC Global 표준에 따라 개발된 RFID 미들웨어를 항만 물류 비즈니스에 적용할 수 있는 비즈니스 모델을 정의하였다. 또한 정의한 비즈니스 모델을 항만 물류 분야에 적용한 사례와 적용 결과에 대해 논의하고자 한다.

• The Journal of the Convergence on Culture Technology
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• v.8 no.5
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• pp.29-37
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• 2022

MDR, a new European medical device regulation newly enacted in 2017, requires that medical device products that have received CE conformity certification through MDD be re-certified by May 2024 in line with the new CE MDR regulation. The new MDR requires more stringent medical device clinical evaluation and clinical investigation than the previous MDD required, and also require the submission of documented post-marketing surveillance data. Korean medical device makers also need to meet the new MDR requirements and obtain conformity certification, but the industry is still confused because they do not understand the new regulations thoroughly. In this study, medical device regulations in Korea, the United States, and Europe are compared, and the European MDR is further compared with the previous European Medical Device Directive MDD to help understand the requirements of the new European Medical Device Act.

• Journal of KIISE:Software and Applications
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• v.34 no.9
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• pp.773-784
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• 2007

Aspect-Oriented Programming (AOP) has focused on improving the modularity of the crosscutting concerns. The existing AOP methodology has been mainly focused on the implementation method of programs and thus developer-oriented concern extraction and development were performed. Recently, many studies for applying AOP to the entire software development processes ranging from requirement analysis to design and implementation are being conducted. But specification methods having consistency from the initial phase of concern extraction to implementation phase are not sufficient. In this paper, we have presented the specification of crosscutting concerns so as to solve these problems. The specification of crosscutting concerns provides guidelines and specification from the requirement analysis phase to the process of converting extracted crosscutting concerns to codes. This method reduces the gap to the process of mapping extracted crosscutting concerns into a single class and thus enhances program development and understandability. In addition, it raises program reusability, maintenance and extensibility by enhancing traceability.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.36 no.6B
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• pp.618-630
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• 2011

Mobile RFID system, that consists of the existing RFID reader mounted on the mobile devices such as smartphones, is able to provide the users a variety of services and convenience. Although the users can get the information about a certain product anytime anywhere, there is high probability that their privacy may be violated because their belongings with RFID tags can be scanned by other mobile readers at any time. Several RFID authentication schemes have been proposed to deal with these privacy issues. However, since the existing solutions require heavy computation on the tag side, most of them is not applicable to the general low-cost passive tags which do not have any processing unit. In this paper, we propose the efficient authentication scheme for mobile RFID system applicable to the passive tags as well as the active ones by the best use of computing capability of mobile devices. The proposed scheme satisfies the import security issues such as tag protection, untraceability, anti-traffic analysis. We also implement the proposed scheme on top of real smartphone for feasibility and show the experimental results from it.

• Journal of the Society of Naval Architects of Korea
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• v.48 no.3
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• pp.207-214
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• 2011

Ship design requirements described in the building specification should be reflected in the design process. This paper identifies the configuration of requirements mentioned in the building specification using Ontology Representation Language (OWL). Ontology-based semantic search system specifies the requirement items. Through this extraction, building specifications mentioned for each entry are configured to the tree. Tracking requirements for ship design and a set of procedures to instruct is also used for the V model of systems engineering. The semantic search engine of robot agent and ontology can search the requirements specification document and extract the design information. Thereafter, design requirements for the tracking model that proposes the relationship between the associated BOM(bill of material) and product structure.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.22 no.5
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• pp.99-103
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• 2022

Millimeter-wave tracking radars operate in various environmental restrictions, thus they demand stable power sources with low noise level under high fluctuation of input voltage. This paper presents the design and implementation of the compact power supply with max power of 727 W for Ka-band tracking radar applications. To meet requirements of voltage accuracy and system efficiency for transceiver circuits, upper plates of buck converters are attached on the covers of power supply for efficient heat dissipation. The proposed power supply achieves system efficiency of 88.4 %, output voltage accuracy of ±2 % and noise level of <1% under full load conditions.

• Journal of Navigation and Port Research
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• v.37 no.1
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• pp.9-14
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• 2013

The e-navigation has been being developed in IMO is a sort of strategy to provide user-oriented services for safe navigation and environmental protection based on the architecture and its related services complying with the user needs. At NAV $57^{th}$ meeting in 2011, the overarching e-navigation architecture was approved which represent overall relationship only between onboard and ashore elements, so more detail technical architecture for each element should be developed for implementation in view of services and systems. Considering the continuous and iterative verification of e-navigation development process required by IMO, the relationship and traceability should be took in consideration between the outcome of e-navigation process and the element of the architecture. In this paper, we have surveyed literarily the user needs, result of gap analysis and practical solutions to address them and defined the architecture elements and their relationship considering the three kinds of views of DoDAF(Architecture Framework) of US department of Defence, in result, proposed the e-navigation shipboard technical architecture.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.19 no.11
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• pp.96-104
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• 2018

Military vessels are complex weapon systems consisting of various integrated onboard equipment. Since their acquisition of military equipment takes a long period of time and a prototype ship is deployed and tested, vessel development has relied on its proprietary process. However, due to the growing complexity of onboard equipment technology, application of systems engineering (SE) process has become indispensable. Nonetheless, an effective design process complementing the existing design with the SE has not yet been developed. As such, we have studied an improved basic design process for submarines based on SE. To do so, we analyzed the processes for the basic design, technical review, and requirement management. Included reviews and requirements are SRR, SFR and PDR, and SSRS, SSS, and SSDD. By combining the results in the SE framework, we built an improved basic design process that can be applied in parallel with the SE-based technical review and requirement management. To assess the process, we applied our proposed model to the submarine development undergoing the basic design phase. It is possible to effectively manage the requirements, design artifacts and improve traceability, and also utilize them as test and evaluation materials. The SE-based basic design process is expected to be useful in other kinds of vessel design.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.20 no.3
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• pp.121-127
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• 2020

The small tracking radar targets the target in a real-time, fast-moving, fast-moving target against aircraft with a large RCS that is maneuvering at low speed and a small RCS aircraft maneuvering at high speed (fighters, drones, helicopters, etc.) It is a pulsed radar that detects and tracks. Performing a performance test on a tracking radar in a real environment is expensive, and it is difficult to quantitatively measure performance in a real environment. Describes the composition of the laboratory environment's comprehensive performance test facility and the main requirements and implementation of each configuration.Anechoic chambers to simulate the room environment, simulation target generator to simulate the signal of the room target, target It is composed of a horn antenna driving device to simulate the movement of a vehicle and a Flight Motion Simulatior (FMS) to simulate the flight environment of a tracking radar, and each design and implementation has been described.