• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
• /
• 1988.05a
• /
• pp.46-48
• /
• 1988

The effect of cold reduction ratio on magnetic properties of 45% Ni-Fe permalloy was studied. To know the relationship between the crystal orientation and the magnetic properties, the pole figure was measured by X-ray diffraction method. In the case of single rolled reduction, the coercive force decreased with cold reduction ratio monotonically, but the maximum permeability, induction and squreness increased drastically. In the case of double rolled reduction (total reduction ratio is 90%), the saturation and residual induction increased slightly with secondary reduction ratio, but the maximum permeability and the coercive force had the maximum and the minimum value at the 50/50% reduction ratio respectively. And strong {100} <100> pole was developed by increasing the cold reduction ratio.

• Proceedings of the Korean Information Science Society Conference
• /
• 2006.06a
• /
• pp.85-87
• /
• 2006

압타머칩은 (주)제노프라에서 개발한 새로운 개념의 바이오칩으로서, 압타머(aptamer)를 이용하여 혈액중의 특정 단백질군의 상대적인 양의 변화를 측정할 수 있으며, 질병 진단에 바로 응용할 수 있는 도구이다. 본 논문에서는 압타머칩 데이터 분석을 통해 심혈관 질환 환자의 질병 진행 단계를 예측할 수 있음을 보인다. 정상, 안정/불안정성 협심증, 심근경색의 네 단계로 표지된 환자의 혈액 샘플로부터 제작한 (주)제노프라의 3K 압타머칩 데이터를, 일반 DNA 마이크로어레이 분석과 동일한 과정을 거쳐 분류한 결과, 각 단계별 환자샘플이 확연히 구분되는 것을 확인하였다. 분산분석 결과 P-Value를 이용하여 자질 선택을 수행하고, 분류 알고리즘으로는 신경망, 결정트리, SVM, 베이지안망을 적용한 결과. 각 알고리즘별로 50대 남성환자 31개의 샘플에 대하여 $77{\sim}100%$의 정확도로 심혈관 질환의 단계를 구분해내었다.

• Journal of Korea Foundry Society
• /
• v.13 no.1
• /
• pp.94-101
• /
• 1993

The effects of strontium content as modifier on microstructure and mechanical properties were studied in Al-10%Si-0.3%Mg cast alloys. There were not big differences in the form of eutectic Si particle and its morphology depending on adding amount of strontium, but the alloy modified by 0.012%Sr had shown the higher values than the alloy modified 0.038%Sr in strength, elongation and impact value.

• Korean Journal of Animal Reproduction
• /
• v.17 no.4
• /
• pp.347-356
• /
• 1994

A simpled and sensitive microplate enzyme immunoassay(EIA) was developed for the determination of progesterone concentration in serum, based on progesterone monoclonal antibody as anti-progesterone, horseradish peroxidase(HRP) as enzyme-label and tetramethylbenzidine(TMB) as substrate. The assay has a sensitivity of 5 pg-120pg/well and intra- and inter-assay coefficients of variation for progesterone standard curve (1.0ng~10.0ng/ml) were ranged 2.5~9.9% and 1.7.8.0%, respectively, determination coefficient of the regressio equation of our standard curve(R2=0.990$\pm$0.007) were high, and this is the same level as that of commercial kit(Hormonost Bio-Lab, Germany, R2=0.98~0.99). The progesterone concentration of serum determined by both kits (Work & Bio-Lab) were significantly correlated (r=0.95, P<0.01) although a little higher value were resulted in our kit than that of commercial kit. It generally is these results indicated that the microplate-EIA can be cused for the determination of progesterone in serum, as well as, for the determination of the early pregnancy diagnosis.

• 한국정보디스플레이학회:학술대회논문집
• /
• 2005.07a
• /
• pp.310-313
• /
• 2005

CW laser dopant activation (CLDA) is suggested as an alternative to conventional thermal annealing. The sheet resistance of the ion doped poly-Si after CLDA is sufficiently low compared to the value measured after thermal annealing. The surface damage due to ion doping on the poly-Si can be recovered while CW laser scan for dopant activation. Therefore, the CLDA can be applied to LTPS processing.

• 한국기계연구소 소보
• /
• s.19
• /
• pp.81-92
• /
• 1989

This paper presents a simple identification method of the actual kinematic parameters for the robot with parallel joints. It is known that Denavit-Hartenberg's coordinate system is not useful for nearly parallel joints. In this paper, the coordinate frames are reassigned to model the kinematic parameter between nearly parallel joints by four parameters. The proposed identification method uses a straight ruler about 1m long. A robot hand is placed by using a teaching pendant at the prescribed points on the ruler, and corresponding error function is defined. The identified kinematic parameters which make the error function zero are obtained by iterative least square error method based on the singular value decomposition. In the compensation of joint angles, only the position is considered because the usual applications of robot do not require a precise orientation control.

• Proceedings of the KIPE Conference
• /
• 2017.07a
• /
• pp.208-209
• /
• 2017

When controlling a three-phase inverter that drives AC motor, it is important to know the value of the current. In this case, shunt sensing methods are known as low cost and useful performance. However, for certain swithcing condition, immeasurable areas exist and it is necessary to reconstruct the current in the area. This paper proposes a reconstruction method using voltage injection in synchronous coordinates system at the area, and verify the validity of the method through simulation.

• The Transactions of the Korean Institute of Power Electronics
• /
• v.25 no.3
• /
• pp.162-170
• /
• 2020

In this paper, we report our study of the current measuring technique by implementing a pick-up coil in the PCB pattern instead of the current measuring sensor in a power converter using a WBG device. The proposed PCB pattern coil structure has a higher mutual inductance value than the conventional pattern by constructing the coil using the multi layer board. It has high sensitivity and is configured without additional process outside the PCB. In the current measurement, the integrator is measured by integrating the coil at the back end and the current waveform measured using proposed pick-up coil is confirmed by comparing it with the original current waveform through DPT simulation.

• Proceedings of the Korean Information Science Society Conference
• /
• 2005.07b
• /
• pp.703-705
• /
• 2005

연속적이고 동적인 실세계에서의 경로 탐색 문제는 이동 로봇 분야에서 주된 문제 중 하나였다. 최근 컴퓨터 성능이 크게 발전하면서 컴퓨터 게임들이 실제에 가까운 연속적인 3차원 환경 모델을 사용하기 시작하였고, 그에 따라 보다 복잡하고 동적인 환경 모델 하에서 경로 탐색을 할 수 있는 능력이 요구되고 있다. 강화 학습 기반의 경로 탐색 알고리즘인 평가치 반복(Value iteration) 알고리즘은 실시간 멀티에이전트 환경에 적합한 여러 장점들을 가지고 있으나, 문제가 커질수록 속도가 크게 느려진다는 단점을 가지고 있다. 본 논문에서는 연속적인 3차원 상황에서 빠르게 동적 변화에 적응할 수 있도록 하기 위하여 작은 세상 네트웍 모델을 사용한 환경 모델 및 경로 탐색 알고리즘을 제안한다. 3차원 게임 환경에서의 실험을 통해 제안된 알고리즘이 연속적이고 복잡한 실시간 환경 하에서 우수한 경로를 찾아낼 수 있으며, 환경의 변화가 관측될 경우 이에 빠르게 적응할 수 있음을 확인할 수 있었다.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.12 no.4
• /
• pp.603-610
• /
• 2008

In this paper, we propose an efficient noise reduction algorithm for digital hologram during acquisition and transmission. The proposed algorithm segment a digital hologram with object region and background region after DCT. Then, we adopt a histogram transition method for object region and zero-value change method for background region. The experimental results show that our algorithm has beuer performance than a natural image denoising algorithm.