• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2013.10a
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• pp.292-294
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• 2013

바코드는 빠른 시간동안 발전을 해왔으며 이는 우리 생활에 매우 밀접하게 다가왔다. 이러한 바코드 시스템은 손쉽게 제작이 가능하며, 여러 분야에서 사용이 가능하였다. 그러나 이러한 바코드는 간편한 제작과 부착의 용이함을 가지고 있으나 훼손에는 매우 취약하다. 통상적으로 제품의 유통과정에서만 사용되는 바코드는 재사용이 되지 않는 반면 반입 반출이 필요한 제품에 활용 시 바코드는 훼손에 매우 취약하다. 본 논문에서는 앞서 언급한 문제를 해결하기 위하여 바코드 시스템의 단점을 보완하기 위해서 이미지를 활용한 제품의 진위 여부 판단 시스템을 제안하고자 한다. 제안되는 시스템은 RFID등의 별도 인식장비 없이 모바일 디바이스의 기울기센서와 카메라기능을 활용한 정규화 기법을 적용하고, 이미지 비교를 위해 SIFT 알고리즘 최적화 과정을 포함한다.

• 한국IT서비스학회:학술대회논문집
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• 2008.11a
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• pp.285-288
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• 2008

최근 IT 패러다임은 인터넷 중심에서 인간과 사물, 컴퓨터가 융합되는 기술로 급속히 전환되고 있다. 이를 위해 인간과 사물, 사물과 사물 사이 네트워크화를 위해서 RFID/USN 분야가 핵심 IT 산업군으로 형성되고 있다. USN을 활용한 다양한 서비스 가운데 u-Healthcare는 큰 사회적 이슈로 대두되고 있다. 이러한 u-Healthcare system의 원활한 활용을 위해서는 u-Healthcare system을 지원하는 미들웨어(Middleware)에 대한 연구가 필요하다. 따라서 본 연구에서는 미들웨어의 기능 중 센서(Sensor)를 통해 획득한 데이터의 정확성을 높이는 방법에 초점을 두었다. 이를 위하여 멀티 스레드(Multi Thread)방법을 u-Healthcare 미들웨어에 적용하여 다양한 어플리케이션에서 요구하는 개별 데이터의 정확성을 향상 시키는 방안을 연구하였다.

• Proceedings of the IEEK Conference
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• 2007.07a
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• pp.479-480
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• 2007

It is study about implementation of the home network system that used an ubiquitous sensor network and an embedded system in this paper. PXA270 and CC2420 were used, and the home server of a wireless sensor home network system composed it. A wireless control system is composed of a gas valve, a DC motor, a lamp and a door rock. A wireless detection system is composed of a gas detection sensor, a movement detection sensor, an extension detection sensor The wireless detection system that was an environment sensing system was composed of temperature, humidity, mic, illuminance, a speed-up, infrared rays temperature sensing module, and modular, other RFID established an USB camera, and an ubiquitous home network was composed.

• Proceedings of the KSRS Conference
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• 2009.03a
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• pp.139-142
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• 2009

증강현신 기술은 지리정보 가시화 영역에 높은 잠재력을 갖고 있다. 특히, 실제 환경에 가상의 지리정보를 증강시킴으로써 사용자가 직관적으로 정보를 습득, 사용할 수 있다는 점이 장점으로 작용할 것이다. 하지만 기존의 실외환경 증강현실 시스템들은 GPS를 사용하거나 RFID 또는 마커를 사용하여 사용자의 위치를 트레킹 하고자 하였다. 이러한 연구들은 도심환경과 같은 복잡한 공간에서 정확도가 떨어지게 되고, 많은 양의 센서를 설치해야 하기 때문에 실용성에 의문이 든다. 이에 본 논문은 GPS의 장점을 살리면서 별도의 기반시설을 필요로 하지 않는 새로운 트래킹 방법을 제안하고자 한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2015.10a
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• pp.875-877
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• 2015

IoT 환경의 센서 네트워크와 RFID 태그 등에서의 AES나 SEED에 대응 할 수 있는 새로운 저전력 경량화 암호 알고리즘이 필요 해짐에 따라 본 논문에서는 2006년 국내에서 제안된 HIGHT와 2007년 CHES에서 제안된 PRESENT 알고리즘을 Arduino에 적용하여 성능을 비교분석 하였다. 그 결과 HIGHT 알고리즘이 PRESENT알고리즘에 비하여 더 짧고, 적은 수행시간과 프로그램 메모리 사용량을 보였으며, 더 많은 동적 메모리 사용량을 보였다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2009.10a
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• pp.1067-1070
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• 2009

It is important to control environment information such as temperature in distribution & logistics systems. To manage temperature and environment information in realtime, SCCM(Smart Cold Chain Management) system must manage and integrate tags and various types sensor information. But, it needs standard code system to manage and integrate various types tags and sonsors. In this paper, we propose standard code system to apply the SCCM system.

• Journal of the Korea institute for structural maintenance and inspection
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• v.15 no.3
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• pp.116-124
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• 2011

In this study, a new method to estimate the bridge deflection is developed by using Wireless Tilt Sensor. Most of evaluations of structural integrity, it is very important to measure the geometric profile, which is a major factor representing the global behavior of civil structure, especially bridges. In the past, Because of the lack of appropriate methods to measure the deflection curve of bridges on site, the measurement of deflection had been done restrictly within just a few discrete points along the bridge. Also the measurement point could be limited to locations installed with displacement transducers. So, in this study, the deflection of the structure was measured by wireless tilt sensor instead of LVDT(Linear Variable Differential Transformer). Angle change of tilt sensor shows structural behavior by the change of the resistor values which is presented to voltage. Moreover, the maximum deflection was calculated by changing the deflection angle which was calculated as V(measured voltage) ${\times}$F(factor) to deflection. The experimental tests were carried out to verify the developed deflection estimation techniques. Because the base of tilt measuring is the gravity, uniform measurement is possible independent of a measuring point. Also, measuring values were showed very high accuracy.

• Journal of the HCI Society of Korea
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• v.2 no.2
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• pp.27-34
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• 2007

In ubiquitous computing, there is increasing demand for ubiquitous displays that react to a user's actions. We propose a method of navigating pictures on an ambient display using implicit interactions. The ambient display can identify the user and measure how far away they are using an RFID reader and ultrasonic sensors. When the user is a long way from the display, it acts as a digital picture and does not attract attention. When the user comes within an appropriate range for interaction, the display shows pictures that are related to the user and provides quasi-3D navigation using the TIP(tour into the picture) method. In addition, menus can be manipulated directly on a touch-screen or remotely using an air mouse. In an emergency, LEDs around the display flash to alert the user.

• Journal of Korea Multimedia Society
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• v.12 no.5
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• pp.644-652
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• 2009

New communication environments such as USN, WiBro and RFID have been realized nowadays. Thus, in order to ensure security and privacy protection, various light-weight block ciphers, e.g., mCrypton, HIGHT, SEA and PRESENT, have been proposed. The block cipher mCrypton, which is a light-weight version of Crypton, is a 64-bit block cipher with three key size options (64 bits, 96 bits, 128 bits). In this paper we show that 8-round mCrypton with 128-bit key is vulnerable to related-key rectangle attack. It is the first known cryptanalytic result on mCrypton. We first describe how to construct two related-key truncated differentials on which 7-round related-key rectangle distinguisher is based and then exploit it to attack 8-round mCrypton. This attack requires $2^{45.5}$dada and $2^{45.5}$time complexities which is faster than exhaustive key search.

• The Journal of the Korea Contents Association
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• v.7 no.2
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• pp.92-99
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• 2007

This paper presented a low power design of a 32bit block cypher processor reduced from the original 128bit architecture. The primary purpose of this research is to evaluate physical implementation results rather than theoretical aspects. The data path and diffusion function of the processor were reduced to accommodate the smaller hardware size. As a running example demonstrating the design approach, we employed a modified ARIA algorithm having four S-boxes. The proposed 32bit ARIA processor comprises 13,893 gates which is 68.25% smaller than the original 128bit structure. The design was synthesized and verified based on the standard cell library of the MagnaChip's 0.35um CMOS Process. A transistor level power simulation shows that the power consumption of the proposed processor reduced to 61.4mW, which is 9.7% of the original 128bit design. The low power design of the block cypher Processor would be essential for improving security of battery-less wireless sensor networks or RFID.