• 한국기계가공학회지
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• 제21권2호
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• pp.116-122
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• 2022

This study proposed a method of testing the stability when selecting gears to reduce the weight of a 3-DOF wrist mechanism for a pick-and-place 3-DOF parallel robot with an increased workspace by using an additional straight axis at its top. We performed SolidWorks^® modeling- and ANSYS^®-based structural analysis of a pinion gear, which is most vulnerable to the force from a 3-DOF wrist mechanism, to lighten the robot weight for performing various tasks. When the initial analysis results considerably differed from the theoretical values calculated in advance, we checked and identified the errors in the contact conditions or input values. Ultimately, it is believed that the methodology presented in this paper will help in mitigating errors during analysis and determine the accurate values for a lightweight 3-DOF wrist mechanism for a parallel robot with an expanded workspace.

• Asian Pacific Journal of Cancer Prevention
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• 제16권17호
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• pp.7935-7941
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• 2015

The aim of this study was to implement massive parallel sequencing (MPS) technology in clinical genetics testing. We developed and tested an amplicon-based method for resequencing the BRCA1 and BRCA2 genes on an Illumina MiSeq to identify disease-causing mutations in patients with hereditary breast or ovarian cancer (HBOC). The coding regions of BRCA1 and BRCA2 were resequenced in 96 HBOC patient DNA samples obtained from different sample types: peripheral blood leukocytes, whole blood drops dried on paper, and buccal wash epithelia. A total of 16 random DNA samples were characterized using standard Sanger sequencing and applied to optimize the variant calling process and evaluate the accuracy of the MPS-method. The best bioinformatics workflow included the filtration of variants using GATK with the following cut-offs: variant frequency >14%, coverage ($>25{\times}$) and presence in both the forward and reverse reads. The MPS method had 100% sensitivity and 94.4% specificity. Similar accuracy levels were achieved for DNA obtained from the different sample types. The workflow presented herein requires low amounts of DNA samples (170 ng) and is cost-effective due to the elimination of DNA and PCR product normalization steps.

• Journal of the Korean Wood Science and Technology
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• 제52권2호
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• pp.157-174
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• 2024

This study investigates the influence of varying concentrations of boric acid (BA) preservative on the physical and mechanical properties of light red meranti (LRM) found in Sarawak. LRM or Shorea leprosula samples were treated with various concentrations of BA via the dip diffusion method using American Society for Testing and Materials (ASTM) standards. The physical property, particularly the retention rate and mechanical properties, bending strength, modulus of elasticity (MOE), tensile and compression strength parallel to grain of impregnated and control samples were tested to determine the effects of BA preservative. The retention rate was found to increase with increasing BA concentration and higher surface area to volume ratio. The mechanical properties in terms of the MOE and tensile strength parallel to grain were found to be greater than those of the control samples, whereas the bending strength and tensile strength parallel to grain were lower. Amongst the results, only the retention rate and MOE showed significant interaction effects at 5% level of significance between all factors tested (samples size and BA concentration for retention rate and BA concentration for MOE).

• 한국산학기술학회논문지
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• 제14권2호
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• pp.858-867
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• 2013

본 연구에서는 MPSOC(Multiprocessor System-on-Chip) 환경의 소프트웨어적인 측면을 주 연구대상으로 하였고 범용 전문 프로그래머들에게 병렬 애플리케이션 프로그래밍을 위한 패턴언어를 제공한다면 병렬처리의 장점을 호소할 수 있을 것으로 보았다. 특히 자체적인 분류에 따른 Data, Tasks, Data flow 모델을 선별하고 그중 CUDA와 HOPES를 경험한 대상으로 Petri Net을 활용, 그들의 숙련도를 확인하는 과정을 포함한다. 각 영역의 숙련 정도, 서로 다른 모델에 대한 이해도를 실험을 통해 검증하였다. 페트리넷은 병렬프로그래밍의 설명에 용이한 모델로 특히 동시성과 병렬성을 설명하는데 탁월한 모형을 제시 할 수 있었다. 실험대상자들에게 페트리넷에 관한 4시간의 선행학습을 시킨 후 56명에게 실험을 실시하여 독립표본 t-검정을 수행했다. 비록 설정된 두 가지 가설이 지지되지 않았지만, 각 영역에서의 숙련자들이 Tasks 중심 혹은 Data 중심의 모형을 얼마나 상호 이해하는가를 판단 할 수 있었다.

• 한국정보처리학회논문지
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• 제4권8호
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• pp.1987-1994
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• 1997

ATM 교환기 소프트웨어 품질 특성은 신뢰성이 높고 기능성, 확장성 및 유지 보수성이 조아야만 한다. 소프트웨어의 개발 과정이나 설계 후에 이러한 품질 특성이 만족되었는지의 여부를 평가하고 검증하는 테스팅 도구들은 많이 개발되어 왔으나 ATM 관련 소프트웨어의 품질 평가 도구는 기능성에서 뒤떨어지고 품질면에서도 부적합하다. 본 논문에서는 CHILL 언어로 작성된 ATM 교환기 소프트웨어를 대상으로 이를 평가하기 위한 테스팅 분석자료, 디버깅 및 유지 보수 정보를 제공하는 정적 도구를 설계하여 구현한다. 이 도구는 입력 프로그램에 대한 높은 가시성을 제공하여 병렬 프로세싱에 관한 정보를 통계표와 그래프로 나타내는 특성을 갖는다.

• 전자공학회논문지A
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• 제32A권12호
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• pp.25-35
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• 1995

An analysis method of electromagnetic coupling through an arbitrarily shaped aperture on the upper wall of parallel-plate waveguide, when excited by an electromagnetic plane wave from outside, is considered. The mixed-potential integral equation, in which Green's functions are expressed in a computationally efficient closed form by using the Prony's method and the Sommerfeld identity, is formulated. Expanding the unknown equivalent magnetic surface current in terms of two-dimensional rooftop-type basis functions and choosing razor testing, the integral equation is reduced to a linear algebraic equation, which is solved. The results are compared with the previous results. Fairly good agreements between them are observed.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2002년도 춘계학술대회 논문집 전기기기 및 에너지변환시스템부문
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• pp.183-185
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• 2002

This paper proposes the test method for the testing of a RLC parallel circuit on the electronic circuit board. This method utilizes a guarding circuit and a phase detection circuit. The guarding circuit separates electrically the tested device or circuit from printed circuit board. Phase detector estimates the phase difference from two signals, voltage and current. This method computes R. L and C value from phase difference($\theta$) and impedance value(Z) obtained by enforcing two other frequence stimulus under the guarding state.

• 전자공학회논문지B
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• 제33B권7호
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• pp.173-182
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• 1996

In this paper, we propose the parallel, self-organizing, hierarchical neural netowrks as a handwritten digit recognition system. This system can absorb the various shape variations of handwritten digits by using the different methods of extracting the features in each stage neural network (SNN) of the PSHNN, and can reduce training time by using the single layer neural network as the SNN, and can obtain high rate of correct recognition by using the certainty area in all the output nodes individually. experiments have been performed with NIST database. In which we use 21, 315 digits (10, 625 digits for training and 10,663 digits for testing). The results show that the correct rate is 97.48% the error rate is 1.72% and the reject rate is 0.78%.

• 한국음향학회지
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• 제20권2호
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• pp.21-26
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• 2001

본 논문에서는 잡음에 강인한 음성인식을 위해서 expectation-maximization (EM) 방식을 이용하여 잡음의 평균값을 추정하는 새로운 알고리듬을 제안하였다. 제안된 알고리듬에서는 온라인상의 인식용 음성이 직접 Bayesian 적응을 위해서 사용되며, 또한 훈련데이터를 이용하여 잡음의 평균값에 대한 사전 (prior) 분포를 알아낸 후 Bayesian 적응시에 이용한다. 잡음 음성의 모델링을 위해서는 PMC (parallel model combination) 방식을 이용하였고, 제안된 방식을 이용하여 자동차 잡음 환경 하에서 인식 실험을 수행한 결과, 기존의 PMC 방식에 비해서 향상된 인식성능을 보임을 알 수 있었다.

• Fibers and Polymers
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• 제5권4호
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• pp.316-320
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• 2004

Waterproof fabrics are seamed and sealed by waterproof sealing tape to prevent water from penetrating through the stitch holes. As this process may change the mechanical properties of breathable waterproof fabric related to its deformation with human body, the changes in mechanical properties were investigated. In both of parallel and perpendicular directions, tensile characteristics were remarkably changed with seaming and sealing processes. The increase of LT and WT means that the clothing sealed by waterproofing tape may produce somewhat discomfort feeling. On the other hand, the bridge of the sewing thread seemed to be reinforced by waterproofing tape. Shear characteristics such as G, 2HG, and 2HG5 gradually increased with seaming and sealing processes in parallel direction. However, they decreased with sealing process in perpendicular direction because the seam line would work as an axis located at the center of the testing range.