• The Journal of the Korea institute of electronic communication sciences
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• v.10 no.9
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• pp.1065-1070
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• 2015

The era of IoT in which all objects are intelligent and are connected to the Internet has been started. In order to establish and activate an IoT eco system, open services platform is very important. In this paper, we developed a gateway that utilize the Raspberry Pi which is open source hardware for IoT open service platform. The gateway supports a variety of wireless interface and equipped with MQTT, a standard messaging protocol for IoT. To confirm main function of developed gateway, we built a IoT test bed and verified normal operation of our gateway.

• KIPS Transactions on Computer and Communication Systems
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• v.4 no.7
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• pp.227-234
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• 2015

USN-based real-time monitoring systems, which receive raw data from sensor nodes and store the processed information in traditional servers, recently get to be replaced by IoT(Internet of Things)/WoT(Web of Things)-based ones. Especially, Social Web of Things(SWoT) paradigm can make use of cloud storage over Social Network Service(SNS) and enable the possibility of integrated access, management and sharing. This paper proposes an improved SWoT-based real-time monitoring system which makes up for weak points of existing systems, and implements monitoring service integrating a legacy sensor network and commercial SNS without requiring additional servers. Especially, the proposed system can reduce emergency propagation time by employing PUSH messages.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.25 no.6
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• pp.1449-1453
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• 2015

Constrained IoT devices cannot achieve full coverage of software attestation even though the integrity of software is critical. The limited modification attacks on control flow of software aim at the shadow area uncovered in software attestation processes. In this paper, we propose a light-weight protection system that detects modification by injecting markers to program code.

• Proceedings of the Korean Society of Agricultural Engineers Conference
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• 2003.10a
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• pp.603-606
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• 2003

This study was carried out to investigate the effects of T-P concentrations in irrigation water on the growth, yield, and grain quality of rice. It acquire fundamental knowledges to set up irrigation water quality standards. The pot experiment was conducted with 5 treatments using irrigation waters. It consisted of various total phosphorus concentrations(control, 1, 2, 5, 10mg/L) and replicated four times with randomized block design. The results of this study showed that as T-P concentrations in irrigation water increases, plant height tended to increase. Dry weight of rice plant at T-P 10mg/L was significantly higher than the control. However, T-P in irrigation water did not affect plant height, tiller number, plant dry weight, yield, and quality of rice.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2005.11a
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• pp.279-282
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• 2005

디지털TV라는 진화된 매체와 방송, 통신 융합이 라는 새로운 패러다임의 등장으로 인해 T-Commerce는 그 잠재성에 많은 기대를 받고 있는 시장이다. 그러나 현재까지 국내에서는 양방향 데이터 방송이 보편화된 상황이 아니며, 성공 사례도 부족하여, 비즈니스 모델에 대한 구체적인 연구가 요구되고 있다. 본 연구에서는 T-Commerce 비즈니스 모델에 있어 고객 만족도에 영향을 미치는 고객 가치를 도출하고자 한다. 이를 위해서 우선, e-비즈니스 모델과 고객 만족도에 영향을 미치는 가치에 대한 선행연구들을 통해서 e-Commerce의 고객 가치 요인들을 분석하였다. 선행연구 분석결과를 T-Commerce 프로세스와 접목하여 6가지의 주요 요인을 채택하여, 홈 네트워크 시범단지의 포커스 그룹을 대상으로 실시된 T-Commerce 소비자 조사 결과를 바탕으로 타당성을 검증하였다.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.20 no.1
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• pp.1-9
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• 2021

In this paper, we propose an IoT-based traffic safety pedestrian system for the elderly by factor analysis. The proposed system performs a factor analysis of the elderly safety variables and uses the analysis results to provide an optimal path for the elderly. In order to verify the performance of this system, we experimented with performance measurements on elderly pedestrian paths. As a result, we confirm that it provides a better safety path than mobile navigation.

• Proceedings of the Korea Information Processing Society Conference
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• 2023.11a
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• pp.796-798
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• 2023

IoT 기기 사용량의 증가로 인해 해킹 사례도 함께 증가하며 보안의 중요성이 커지고 있다. 본 논문은 IoT 보안 취약점을 해결하기 위해 정상/악성코드의 데이터셋을 Grayscale로 변환하여 악성코드/정상코드로 분류하는 알고리즘을 개발해 IoT 기기에서 성능을 검증한다. 분류에 이용되는 딥러닝 알고리즘은 CNN(Convolutional Neural Network)으로 99.60%의 평균 정확도를 나타내며 IoT 기기(라즈베리파이)에서도 잘 작동됨을 확인할 수 있다.

• Journal of the Korea Society of Computer and Information
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• v.3 no.2
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• pp.69-76
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• 1998

To test all internal faults in the case that the number of Primary Input is N, we need patterns that are composed of PI's of maximum 2N. In this paper, we proposed the method to reduce a search space by dividing the multiple output circuit into subcircuit that is related with output. And this method, called PBM(Partition-Based Method), can generate a set of test pattern. The method can effectively generate a test pattern for evaluating all fault of circuit, because the length of input pattern is smaller than that of full circuit and PBM doesn't search any signal line that is not concerned with detecting fault.

• Journal of KIISE:Databases
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• v.30 no.5
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• pp.540-551
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• 2003

Recently, several works have been proposed for updating XML documents［l-3] stored in databases. These researches defined update operations and resolved some semantic problems. Because the update operations are usually validated after execution, several conflicts nay occur. For solving these conflicts, XML database systems must be able to validate an update operation immediately according to DTD before the update operation is executed. Furthermore, in many studies for updating, they just validate whole XML documents and can't validate parts of them. If updates are very frequent, validating whole XML documents will cause performance degradation. In this paper, we propose solutions for these two problems. We extract and store DTD information. Then, when an XML document stored in the database is updated, we verifies whether the update is valid or not by using the information. Consequently, XML database systems can always maintain valid XML documents. The validity of update operations is checked immediately before the actual update operation is applied to the database and the validation is performed on only updated parts of an XML document in the database.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2008.06a
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• pp.725-726
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• 2008