• 인터넷정보학회논문지
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• 제5권4호
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• pp.115-124
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• 2004

본 논문에서는 가중 퍼지 페트리네트에 기반을 둔 규칙기반시스템을 위한 가중 퍼지 후진추론 알고리즘을 제안한다. 규칙기반시스템에 있는 퍼지 생성규칙은 가중 퍼지 페트리네트로 모형화된다. 여기에서 퍼지 생성규칙에 나타나는 퍼지 명제의 진리값과 규칙의 확신도는 퍼지 숫자로 표현한다. 그리고 규칙에 나타나는 퍼지 명제의 가중값도 퍼지 숫자로 표현하다. 제안한 가중 퍼지 후진추론 알고리즘은 목표노드에서 초기노드까지 후진추론 통로를 생성한 후 목표노드의 확신도를 계산한다. 우리가 제안한 알고리즘은 규칙기반시스템이 더 유연하고 사람과 같은 방법으로 가중 퍼지 후진추론을 하는 것을 가능하게 한다.

• 대한임베디드공학회논문지
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• 제6권2호
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• pp.108-116
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• 2011

Non-line-of-sight (NLOS) error is the most common and also a major source of errors in wireless location system. A novel weighting factor (NWF) method is presented in this paper, based on the RSS(Received Signal Strength) measurements, path loss model and Circular Disk of Scatterers Model (CDSM). The proposed positioning method effectively weighted the TOA distance measurements for each Base Station (BS). Simulation results show that the proposed method efficiently weighted the distance measurements and achieve higher localization accuracy than that of Linear Line of Position (LLOP) and Believable Factor Algorithm (BFA).

• 전자공학회논문지B
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• 제33B권2호
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• pp.20-27
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• 1996

In this paper, we propose a coprime factor model reduction method to get a reduced order controller in $H^{\infty}$ mixed sensitivity problem with frequency weighting functions. for this purpose, the given $H^{\infty}$ mixed sensitivity problem is transformed into robust stabilization problem with coprime factor uncertainty of given plant. This method is to define frequency weighted coprime factors of plant in CSD (chain scattering description) form and reduce the coprime factors using weighted balanced truncation. then a controller is designed to the reduced order coprime factors using J-lossless coprime factorization method. Using this approach, the robust stability condition is derived and good performance is preserved in closed loop system with the given plant and the reduced order controller. Also the order of reduced controller for guaranteeing the robust stability can be determined before designing the reduced controller. The proposed method behaves well in both stable and unstable plant.

• 한국CDE학회논문집
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• 제21권2호
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• pp.151-158
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• 2016

It is important to analyze dimensional errors occurring during shipbuilding process. A ship is constructed by assembling blocks and installing outfits in assembled ship structure. Blocks and outfits have a main direction that has greater importance than other directions from the view point of dimensional error. Therefore, a main direction should have a greater weighting factor than other directions in order to achieve meaningful inspection results. In this paper, a modified point registration method based on iterative closest point (ICP) is proposed. In this method, a user determines one or two main directions among x, y, and z directions, and then each main direction is made to have a greater weighting factor than other directions. For points registration, mapping between measured points and design points are performed by the modified ICP in which weighting factor assigned to each main direction is considered.

• 한국음향학회지
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• 제18권1호
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• pp.10-15
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• 1999

본 연구는 35° Y-X Quartz 기판에 낮은 형상 요소를 갖는 Code Division Multiple Access(CDMA)방식 기지국용 Intermediate Frequency (IF)단 통과대역 필터를 설계하고 제작하는 방법에 대해 연구하였다. 이 기판 위에 임펄스 모델링을 이용하여 낮은 형상 요소를 갖는 표면 탄성파 필터를 제작하기 위해 입력단에는 Apodization weighted형의 빗살무늬 변환기, 출력단에는 Withdrawal weighted형의 빗살무늬 변환기로 구성하였다. 그리고 입출력 IDT의 개수는 리플의 영향을 최소화하기 위해 Kaiser-Bessel 창함수를 이용하였으며, 각각 2200쌍과 1000쌍으로 하였다. IDT 전극의 폭은 3.6㎛, 간격은 3.5㎛였으며 두께는 파장과의 비를 고려해 6000Å으로 할 때 최적의 결과를 얻을 수 있었으며, 구경은 임피던스 정합을 위해 2mm로 하였다. 제작된 SAW필터는 중심 주파수 115.2MHz, 통과대역 폭은 1.27MHz이상, 형상 요소는 1.3이하, 삽입손실 -l5dB 및 저지대역 -45dB이하인 특성을 얻을 수 있었다.

• Journal of Welding and Joining
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• 제18권1호
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• pp.83-90
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• 2000

It was attempted to improve seam-tracking performance by applying a new arc-sensing algorithm for FCAW(flux-cored arc welding) process in fillet joints. For this study the authors have introduced three different weight factors: $\circled1$ arc currents at the weaving end are more weighted, $\circled2$ arc currents are evenly weighted along the weaving, and $\circled3$ arc currents at the weaving center are more weighted. To evaluate the 3 factors the values of signal-to-noise(S/N) ratio has been measured. The values were obtained for various welding conditions with different gaps in horizontal and vertical fillet joints. The test results showed that the S/N ratio of the 1st case was highest which resulted in the best of seam tracking performance. In addition, the comparison between the seam tracking performance in horizontal fillet joints and that in vertical ones has been done, and the result showed that tracking performance in vertical joints was relatively better than that in horizontal joints.

• Journal of the Korean Data and Information Science Society
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• 제19권2호
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• pp.577-585
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• 2008

This paper suggests a marginal probability model for analyzing repeated polytomous response data when some factors are nested in others in treatment structures on a larger experimental unit. As a repeated measures factor, time is considered on a smaller experimental unit. So, two different experiment sizes are considered. Each size of experimental unit has its own design structure and treatment structure, and the marginal probability model can be constructed from the structures for each size of experimental unit. Weighted least squares(WLS) methods are used for estimating fixed effects in the suggested model.

• 동아시아식생활학회지
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• 제14권3호
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• pp.207-216
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• 2004

This study was performed in oder to investigate to dietary behavior, perceived stress and their correlations of University students. The number of subjects was 549 and the results of this study are as followed: Only 13.9% of students-20% of male students, 10% of female students-exercise regularly. Regular exercise and health condition had no statistical relationship in this study. 83.9% of subjects had experience of alcohol drinking (19.4% of male students, 7.3% of female students). Many students replied that they drink alcohol 1∼2 times per a week. 24.4% of students-only 2.6% of female students-were smoking and great number of smokers were drinking also. The BMI of 46.7% of subjects were in normal range. 48.2% were in under weighted and 5.1% were in over weighted or obesity. The stress factor of University students were analyzed into 12. Inner stress factors like as identity, coursework, friendship, health problem were more potent in female students than male. Among the health related habits, disease itself had a great effect on many stress factors but regular exercise had a little.

• 대한전기학회논문지
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• 제41권9호
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• pp.1021-1030
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• 1992

When using a least squares estimator with exponential forgetting factor to identify continuous-time deterministic system, the problem of determining minimum eigenvalue is described in this paper. It is well known fact that the convergence rate of parameter estimates relies on various factors consisting of the estimator and especially, theirproperties can be directly affected by all eigenvalues in the parameter error differential equation. Fortunately, there exists only one adjusting eigenvalue in the given estimator and then, the parameter convergence rates depend on this minimum eigenvalue. In this note, a new result to determine the minimum eigenvalue is proposed. Under the assumption that the input has as many spectral lines as the number of parameter estimates, it can be proven that the minimum eigenvalue converges to a constant value, which is a function of the forgetting factor and the parameter estimates number.

• Nuclear Engineering and Technology
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• 제55권11호
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• pp.4282-4286
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• 2023

Nuclear energy is estimated by the machine learning method as the mathematical quantifications where neural networking is the major algorithm of the data propagations from input to output. As the aspect of nuclear energy, the other energy sources of the traditional carbon emission-characterized oil and coal are compared. The artificial intelligence (AI) oriented algorithm like the intelligence of a robot is applied to the modeling in which the mimicking of biological neurons is utilized in the mathematical calculations. There are graphs for nuclear priority weighted by climate factor and for carbon dioxide mitigation weighted by climate factor in which the carbon dioxide quantities are divided by the weighting that produces some results. Nuclear Priority and CO2 Mitigation values give the dimensionless values that are the comparative quantities with the normalization in 2010. The values are 1.0 in 2010 of the graphs which are changed to 24.318 and 0.0657 in 2040, respectively. So, the carbon dioxide emissions could be reduced in this study.