• Journal of the Institute of Electronics Engineers of Korea SC
• /
• v.40 no.3
• /
• pp.172-180
• /
• 2003

The purpose of this study is to observe the heat transfer process in in-vivo human muscle based on Proton Resonance Frequency(PRF) method in Magnetic Resonance Imaging(MRI). MRI was obtained to measure the temperature variation according to the heat transfer in phantom and in-vivo human calf muscle. A phantom(2% agarose gel) was used in this experiment. MR temperature measurement was compared with the direct temperature measurement using a T-type thermocouple. After heating agarose gel to more than 5$0^{\circ}C$ in boiling hot water, raw data were acquired every 3 minutes during one hour cooling period for a phantom case. For human study heat was forced to deliver into volunteer's calf muscle using hot pack. Reference data were once acquired before a hot pack emits heat and raw data were acquired every 2 minutes during 30minutes. Acquired raw data were reconstructed to phase-difference images with reference image to observe the temperature change. Phase-difference of the phantom was linearly proportional to the temperature change in the range of 34.2$^{\circ}C$ and 50.2$^{\circ}C$. Temperature resolution was 0.0457 radian /$^{\circ}C$(0.0038 ppm/$^{\circ}C$) in phantom case. In vivo-case, mean phase-difference in near region from the hot pack is smaller than that in far region. Different temperature distribution was observed in proportion to a distance from heat source.

• Proceedings of the IEEK Conference
• /
• 1998.06a
• /
• pp.11-14
• /
• 1998

This paper introuces a new efficient method of synchronization acquisition which is the most important element in DS-CDMA system using the phase offset of binary code. This approach uses the binary code function which can easily estimate the phase offset from the received spreading waveforms which respect to the receiver-stored replica of the spreading code. This paper proposes the initial acquisition model with repeat error control device that is good for perfomance. The hardware is implemented by TMS320c30

• 시스템엔지니어링워크숍
• /
• s.1
• /
• pp.54-59
• /
• 2003

A parametric cost estimation has a somewhat problem in the application of Korean defence acquisition program environment. In this paper, it is presented the solution suitable in the environment. The analysis is performed to the PRICE model and Korean defense industry cost accounting. Then, the scheme to solve such problems is presented is terms of data management and appropriate for usage.

• Proceedings of the Korean Statistical Society Conference
• /
• 2003.05a
• /
• pp.103-108
• /
• 2003

데이터마이닝을 위한 대용량 데이터베이스를 축소시키는 방법 중에 속성선택 방법이 많이 사용되고 있다. 본 논문에서는 세 가지 속성선택 방법을 사용하여 조건속성 수를 60%이상 축소시켜 결정나무와 로지스틱 회귀모형에 적용시켜보고 이들의 효율을 비교해 본다. 세 가지 속성선택 방법은 MDI, 정보획득, ReliefF 방법이다. 결정나무 방법은 QUEST, CART, C4.5를 사용하였다. 속성선택 방법들의 분류 정확성은 UCI 데이터베이스에 주어진 Credit 승인 데이터베이스와 German Credit 데이터베이스를 사용하여 10층-교차확인 방법으로 평가하였다.

• Proceedings of the Korean Fiber Society Conference
• /
• 1998.10a
• /
• pp.369-372
• /
• 1998

직물은 다른 소재들에 비하여 약한 외력에도 매우 쉽게 변형되고, 또한 다시 회복하는 성질을 가지고 있어서 인체에 직접 접촉하는 의복용으로 가장 적합한 유연성 소재로서 인류 역사와 함께 이용되어져왔다. 하지만 사용 중 발생하는 구김이나, 봉제 시에 발생하는 심퍼커 등은 직물이 가진 점탄성에 기인하는 현상으로서, 그 외관상의 가치를 저하시킨다. 따라서 구김이나 심퍼커를 억제하여 직물의 형태적 안정성을 획득하려는 노력들이 계속되어져 왔다. (중략)

• Proceedings of the IEEK Conference
• /
• 2007.07a
• /
• pp.207-208
• /
• 2007

In this paper, the tilted image sequence, which is obtained the transmission electron microscopy (TEM) for a 3D reconstruction, is aligned based on the fiducial marker method. A direct correlation method is also conducted between adjacent tilted images for the performance comparison. Using real TEM tilted images, we can successfully perform the alignment.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
• /
• 2023.05a
• /
• pp.212-213
• /
• 2023

항·포구내에서 주.야간에 걸쳐 미등록 선박을 검출하기 위해, 가시광 및 IR, 라이다 센서를 통해 선박 영상 및 거리정보를 획득하고, 딥러닝 기술을 적용하여 선박의 외관에 대한 특징 분석 및 선박에 표기된 문자열의 인식, 선박의 크기 측정을 통해 선박을 분류하고 특정하는 기술 개발

• The Journal of the Korea institute of electronic communication sciences
• /
• v.5 no.1
• /
• pp.31-36
• /
• 2010

In this paper, an autonomous mobile robot for fire detection is designed. The robot is equipped with thermal sensor which rotates for wide range of detection. The fire detector A2TPMI is used. A data processing method for robust fire detection is also implemented. AD converter and Kalman filter is applied to remove noisy signal from the fire detection sensor.

• Proceedings of the Korean Society of Precision Engineering Conference
• /
• 2004.05a
• /
• pp.298-298
• /
• 2004

본 연구는 외부에서 고 농도 (30％)의 산소 공급이 공간 인지 능력에 어떠한 변화를 유발하는지 뇌기능 영상의 시계열 신호 분석을 통해 관찰하고자 한다. 8명의 오른손잡이 남자 대학생 (평균 23.5세)이 피험자로 참여하였다. 21％와 30％ 산소 농도를 각각 BL/min의 양으로 일정하게 공급할 수 있는 장치를 개발하였다. 공간 인지 능력 측정을 위해 20 문항을 포함하는 두 개의 문제지를 제작하였고, 과제 수행 결과로부터 정답률을 산출하였다. 3T MRI 기기를 사용하였고, single-shot EPI 방법으로 뇌기능 영상을 획득하였다.(중략)

• Solar Energy
• /
• v.12 no.3
• /
• pp.84-93
• /
• 1992

Solar assisted heat pump with freon circulating system has been developed. Revising the cool chamber(flower storage) with the solar thermal hot water producing system, the more amount of hot water can be produced, which can be even used for room panel heating. The compressor was cooled by water jaket instead of air cooled so that the system energy efficiency was improved quite well.