• TTA Journal
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• s.134
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• pp.24-29
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• 2011

지난 1990년대에는 월드와이드웹 (WWW)이 화투였고, 2000년대에는 모바일 인터넷이 화두였다면, 2010년대는 모든 사물이 네트워크에 연결되는 Internet of Things(이하 IoT)의 세상이 될 것으로 전망되고 있다. 지난 2005년에 발간된 ITU 보고서에 따르면, IoT가 식별자(부착하는 사물)와 센서 및 무선 센서 네크워크(감지하는 사물), 임베디드 시스템(생각하는 사물), 나노공학(수축하는 사물) 분야의 기술 발전을 통하여 감각뿐 아니라 지능적 형태로 전 세계의 모든 사물 및 객체가 상호 연결될 것이라 주장하며, 이에 대한 준비와 대비가 필요하다고 언급한 바 있다. 또한, 본 보고서는 IoT 실현을 위한 가장 중요한 도전으로 표준화와 협력, 프라이버시, 사회 도덕적 이슈에 대한 철저한 대응이 될 것이라 직시한 바 있다. 이제 우리가 살아가는 세상은 또 다른 새로운 변화에 직면하고 있는 것이다. 현재 전 세계에는 15억 대의 PC와 10억 대의 휴대폰이 인터넷에 연결되어 있으며, 향후 2020년까지 약 500억 대에서 1,000억 대의 장치가 인터넷에 접속하는 IoT 세상으로 전환될 것으로 예측하고 있다. 더욱이, M2M 통신뿐만 아니라 객체 사이 통신까지 포함한다면 인터넷에 연결되는 잠재적 객체의 수는 100조 개에 달할 것이라고 한다. 최근 우리나라에서도 사물지능통신이란 용어가 자주 회자되고 있다. 사물지능통신을 광의의 의미에서 해석하면 IoT로 일컬을 수 있을 것이며, 다만, 협의의 의미로 해석한다면, M2M 통신을 지칭하는 것이 맞는 해석이라고 생각된다. 이에 본 특집에서는 사물지능통신 기술에 대한 현황 및 정책, 앞으로의 서비스 전망, 나아가 표준화 추진 동향 등에 대해 살펴보고 앞으로 다가올 미래 디지털 ICT 사회 변화를 조명해 보고자 한다.

• The Journal of the Korea Contents Association
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• v.9 no.8
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• pp.121-128
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• 2009

Iris recognition is a biometric technology which can identify a person using the iris pattern. Recently, iris information is used in many fields such as access control and information security. It is important for the iris recognition system to extract the feature which is invariant to changes in iris patterns. Those changes can be occurred by the influence of lights, changes in the size of the pupil. In this paper, we propose a novel method based on vector summation of gradient orientation vectors. Experimental results show that the proposed method reduces processing time with simple vector calculation, requires small feature space and has comparable performance to the well-known previous methods.

• Journal of Korea Multimedia Society
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• v.19 no.6
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• pp.1024-1033
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• 2016

In this study, a system is proposed for analyzing whether driver's eyes are open or closed on the basis of images to determine driver's drowsiness. The proposed system converts eye areas detected by a camera to a color space area to effectively detect eyes in a dark situation, for example, tunnels, and a bright situation due to a backlight. In addition, the system used a thickness distribution of a detected eye area as a feature value to analyze whether eyes are open or closed through the Support Vector Machine(SVM), representing 90.09% of accuracy. In the experiment for the images of driver wearing glasses, 83.83% of accuracy was obtained. In addition, in a comparative experiment with the existing PCA method by using Eigen-eye and Pupil Measuring System the detection rate is shown improved. After the experiment, driver's drowsiness was identified accurately by using the method of summing up the state of driver's eyes open and closes over time and the method of detecting driver's eyes that continue to be closed to examine drowsy driving.

• Journal of Korea Multimedia Society
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• v.16 no.6
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• pp.782-794
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• 2013

This paper proposes the wafer position recognition algorithm using camera. First, for eliminating the image distortions caused by the illumination and the irregular camera position, the wafer image is restored as a circle through projective transformation. Next, we use edge detection algorithm to extract the wafer's edge and then apply Generalized Symmetry Transform(GST) to extract a circle. The GST evaluates symmetry between two points by combining a distance weight function, a phase weight function, and a logarithmic mapping of the points' intensities and detecting interest regions. Trough several experiments, we found out the proposed method is able to prevent the cleaning system and the wafer from damaging.

• 월간 기계설비
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• no.4 s.201
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• pp.30-36
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• 2007

ESCO란 에너지 절약회사(Energy Saving Company) 또는 에너지 서비스 회사(Energy Service Company)를 뜻하는 용어로 지난 1992년 정부에서 에너지 절약을 촉진하기 위해 정책자금을 도입하면서 등장했다. 이들 기업은 정부에서 정책자금을 빌려 공장이나 아파트 등 에너지 사용자에게 에너지 절약시설을 지어주고 에너지를 줄인양만큼 투자비를 회수해 간다. 고유가가 계속되면서 에너지절약 전문기업인 ESCO 단위 사업규모가 점차 대형화되고 있다. ESCO 투자실적은 1998년 이후 에너지절약 시설 개체 사업의 급속한 증가에 힘입어 매년 급격히 성장하고 있다. 최근에는 2천억원대의 시장규모를 가지고 2005년에는 건당 평균 9.1억원이 지원된 것으로 나타났다. 에너지관리공단 자금지원팀의 자료에 의하면 ESCO투자사업 자금지원은 1993~1998년 197건에 480억원이 지원됐으나 2005년에는 202건에 1,829억원이 지원된 것으로 나타났다. 지난 2006년 9월 말 현재 ESCO투자사업 자금지원은 106건에 1,020억원이 대출 은행에 추천된 것으로 알려졌다. 또한 에스코 사업분야가 조명기기·보일러 등 단순설비 교체에서 열병합발전소·냉난방설비, 공정개선 및 폐열회수 등 복합설비 쪽으로 확대되고 있는 것으로 나타났다. 따라서 에너지 소비가 큰 화학 철강 제지 등 산업체, 대형병원, 산업단지 등이 새 에너지 절감 시스템을 도입하면 에너지 효율성 개선에 효과적인 사업이다. 본지는 지난호에 ESCO사업 현황과 투자사례를 게재하고, 이번호에는 ESCO사업 지원시책과 외국의 ESCO활동 현황 및 국내의 ESCO 투자사례를 게재할 계획이다.

• Journal of Korea Multimedia Society
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• v.13 no.2
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• pp.225-236
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• 2010

This study proposes a method for the recognition of emergency situation according to the bimodal information of camera image sensor and gravity sensor. This method can recognize emergency condition by mutual cooperation and compensation between sensors even when one of the sensors malfunction, the user does not carry gravity sensor, or in the place like bathroom where it is hard to acquire camera images. This paper implemented HMM(Hidden Markov Model) based learning and recognition algorithm to recognize actions such as walking, sitting on floor, sitting at sofa, lying and fainting motions. Recognition rate was enhanced when image feature vectors and gravity feature vectors are combined in learning and recognition process. Also, this method maintains high recognition rate by detecting moving object through adaptive background model even in various illumination changes.

• The Transactions of the Korean Institute of Power Electronics
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• v.7 no.4
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• pp.359-365
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• 2002

Three-phase four-wire electrical distribution systems have been widely employed in manufacturing plants, commercial and residential buildings. Due to the nonlinear loads, the neutral conductor carries excessive harmonic currents resulting in wiring failure of the neutral conductor, overloading of the distribution transformer and a voltage drop between the neutral and the ground. This paper proposes a reduced rating active power filter to suppress neutral current harmonics in three-phase four-wire electrical distribution systems. The proposed system is simple in control and the VA rating of the inverter could be significantly reduced since only the fundamental current due to unbalanced loading flows through the inverter switch. The experimental results on a prototype validate the proposed control approach.

• Korean Journal of Computational Design and Engineering
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• v.2 no.1
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• pp.35-43
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• 1997

Concurrent Engineering is one of the methods which are used for the rapid product development. One of the important features in Concurrent Egineering is that the development process is to be parallel and the organization should be cross-functional. In order that the process be parallel and that the organization be cross-functional, an integrated information system such as PDM (Product Data Management) is required. Although the integrated data base is constructed, it could be meaningless if the application softwares were not inter-operable. This study shows an example of intergrated information system from three-dimensional product design to mold design and tooling for the development of Deflection Yoke(DY) which is one of the important parts of Cathode Ray Tube(CRT). A three-dimensional product design software, which is based on a commercial code, has been developed by ourselves. Selective Laser Sintering(SLS), which is one of the rapid prototyping techniques, has been used in this study. Mold design has been done by the three-dimensional way. A newly developed method of mold tooling, which is called Quick Die Manufacturing(QDM), has been introduced.

• Transactions of Materials Processing
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• v.22 no.2
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• pp.74-79
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• 2013

The ultra-precision polishing method using MR fluid has come into the spotlight for polishing metals and optical materials. The MR fluid jet polishing process can be controlled using a change of viscosity by an imposed magnetic field. The MR fluid used for polishing process is a mixture of CI particles, DI water, $Na_2CO_3$ and glycerin. The efficiency of polishing depends on parameters such as polishing time, magnetic field, stand-off distance, pressure, etc. In this paper, the MR fluid jet polishing was used to polish nickel and brass mold materials, which is used to fabricate backlight units for 3-D optical devices in mobile display industries. In MR jet polishing, ferromagnetic materials like nickel can decrease the polishing efficiency by interaction with the cohesiveness of the MR fluid more than non-ferromagnetic materials like copper. A series of tests with different polishing times showed that the surface roughness of brass (Ra=1.84 nm) was lower than that of nickel (Ra=2.31 nm) after polishing for 20 minutes.

• The Journal of the Korea institute of electronic communication sciences
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• v.6 no.6
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• pp.973-980
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• 2011

In this paper, we gaze upon the movement faces the problem points are difficult to identify a user based on points and that corrective action is needed to solve the identification system is proposed a new eye. Kalman filter, the current head of the location information was used to estimate the future position in order to determine the authenticity of the face facial features and structural elements, the information and the processing time is relatively fast horizontal and vertical elements of the face using the histogram analysis to detect. And an infrared illuminator obtained by constructing a bright pupil effect in real-time detection of the pupil, the pupil was tracked - geulrinteu vectors are extracted.