• International Journal of Industrial Entomology and Biomaterials
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• 제10권2호
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• pp.147-151
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• 2005

Serious attempt for the improvement of quality parameters in silkworm hybrids came rather very late in India. Realising the need for productive breeds to the field and reorientation in breeding methodology, the silkworm breeders of CSRTI, Mysore were able to develop silkworm breeds with fine denier namely, JPN7, CSR48, B63 and B65 of specific industrial requirement through directional selection. As the success of silkworm breeds mainly depends on their combining ability, the developed breeds were subjected for hybrid evaluation. Out of 42 bivoltine hybrids studied, one hybrid, $CSR48{\times}CSR5$ was identified for its superiority over the existing bivoltine hybrids namely $CSR2{\times}CSR4,\;CSR2{\times}CSR5\;and\;CSR18{\times}CSR19$ for majority of qualitative traits. Post cocoon testing of large quantity of cocoons of $CSR48{\times}CSR5$ resulted in the production of high quality '3A'grade silk. It is for the first time in the Indian Sericulture industry that high quality silk with longer filament length of 1474 m, denier of 2.47, standard size deviation of 0.983 d, maximum size deviation of 1.322, neatness of 96 p, reelability of $85\%$, tenacity of 3.87 g/d, elongation of $22.32\%$ and cohesion of 110 strokes was produced. The superiority of fine denier silkworm breeds and their hybrids are discussed.

• 한국자동차공학회논문집
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• 제22권2호
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• pp.175-181
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• 2014

A four-link mechanism consisting of torsion bars is used for opening the trunk lid in most midsize sedans. When the weight of the lid is in equilibrium with the spring force exerted by torsion bars, the lid stops opening at a pop-up height. However, the actual pop-up height has large deviations from the specified height even with the same parts in the same car model, which leads to quality issues. Automotive manufacturers have experienced this deviation problem despite much effort to resolve it. In this research, we developed a multi-body dynamics model for the analysis of pop-up deviation of a trunk lid with torsion bars, which can simulate the actual pop-up motion of the trunk lid by considering kinematic constraints of the motion and friction forces in joints. We could also determine the most important factor that governs the pop-up height by sensitivity analysis of all parts. The developed system can be used for the analysis of other trunk lid systems to control the tolerance of parts.

• Industrial Engineering and Management Systems
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• 제15권3호
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• pp.231-238
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• 2016

Traditional acceptance sampling plans have focused on the proportion of nonconforming items as an attribute criterion for quality. In today's modern quality management under high quality production environments, the reduction of the deviation from a target value in a quality characteristic has become the most important purpose. In consequence, various inspection plans for the purpose of reducing the deviation from the target value in the quality characteristic have been investigated. In this case, a concept of the quality loss evaluated by the deviation from the target value has been accepted as the variable evaluation criterion of quality. Further, some quality measures based on the quality loss have been devised; e.g. the process loss and the process capability index. Then, as one of inspection plans based on the quality loss, the rigorous design procedure for the variable sampling plan having desired operating characteristics (VS-OC plan) indexed by the quality loss has been proposed by Yen and Chang in 2009. By the way, since the estimator of the quality loss obeys the non-central chi-square distribution, the rigorous design procedure for the VS-OC plan indexed by the quality loss is complicated. In particular, the rigorous design procedure for the VS-OC plan requires a large number of the repetitive and complicated numerical calculation about the non-central chi-square distribution. On the other hand, an approximate design procedure for the VS-OC plan has been proposed before the proposal of the above rigorous design procedure. The approximate design procedure for the VS-OC plan has been constructed by combining Patnaik approximation relating the non-central chi-square distribution to the central chi-square distribution and Wilson-Hilferty approximation relating the central chi-square distribution to the standard normal distribution. Then, the approximate design procedure has been devised as a convenient procedure without complicated and repetitive numerical calculations. In this study, through some comparisons between the rigorous and approximate design procedures, the applicability of the approximate design procedure has been confirmed.

• 한국의류학회지
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• 제31권3호
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• pp.364-375
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• 2007

The propose of this study is to develop the optimal sizing system of ready-to-wear far elementary school boys using a newly invented statistical technique. The body measurements was classified by the method that equalizes the distribution of the subjects using the probability density function, to theoretically systemize a method to determine a size range of ready-to-wear for elementary school boys between 7 to 12 yeiws old. The results were as follows: 1. Height group includes 9 types of heights: 115, 120, 125, 130, 135, 140, 145, 150 and 155. 2. In the case of short children's groups, the variance in bust girth and waist girth is narrow. The people cluster together around the average. The size deviation of ready-to-wear is small. 3. In the case of tall children's groups, the variance in bust girth and waist girth is wide. The people spread widely around the average. The size deviation of ready-to-wear is large. 4. The optimal size system is suggested considering the weight of growth exponent of children according to their respective ages. Clothing companies can selectively choose sizes that meet the target of their brands. 5. It suggests the body sizes chart, which based on their means by the middle size children for each height group, so that clothing companies make use of it.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2011년도 제42회 하계학술대회
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• pp.1680-1681
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• 2011

In this paper, particle counting system using a CMOS image sensor is demonstrated. The system utilizes a linear photodetector array as a detection element. Therefore, the particles are detected by large detection region, in contrast to a single detector in conventional particle counting devices, while maintaining the sensitivity. The advantage of proposed system is that particles are detected in a relatively large area without using the particle focusing method. Also, proposed system can be easily integrated with a microfluidic chip by attaching the device underneath the bottom plate of the microfluidic chip. Detection of polystyrene microbeads has been tested at a flow rate of 4.89mm/s. For 21 measurements, proposed system showed an average count error of 7.29% and a standard deviation of 4.74%. Potentially, the proposed system can detect even smaller particles simply by utilizing a higher resolution CMOS image sensor.

• Journal of Electrical Engineering and Technology
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• 제13권5호
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• pp.2050-2058
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• 2018

Impulse characteristic of transmission tower grounding grid is needed for lightning protection of transmission line. This paper describes an outdoor experimental test facility established for large-scale grounding grid of transmission tower, made up of four impulse current generators and a circle current return electrode. The amplitude of impulse current is up to 100 kA. The results of the CDEGS simulation and GPR measurement reveal the uniform current distribution in the test arrangement. An impulse test for a square electrode with extended conductors is carried out in condition of three current waveforms with different amplitude. Based on the electrical network model and iterative algorithm method, a calculation model is proposed to simulate the impulse characteristic of large-scale grounding grid considering soil ionization. The curve of impulse resistance against the current amplitude shows the soil ionization both from the simulation and test. Deviation between the simulation and test result is less than 15%.

• 대한두경부종양학회지
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• 제24권1호
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• pp.69-72
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• 2008

Lymphomas of the nasal sinuses are relatively uncommon and represent less than 1% of all head and neck malignancies. Most common symptoms are nasal obstruction, epistaxis, rhinorrhea. We report a case of primary extranodal diffuse large B-cell non-Hodgkin's lymphoma in nasal sinuses accompanying with exophthalmos. A 70-year-old male patient was referred to our hospital with exophthalmos and severe septal deviation. We conducted endoscopic biopsy with septoplasty and biopsy result was diffuse large B-cell lymphoma. He received chemotherapy(R-CHOP) and radiotherapy. At follow-up, he remained free of disease.

• Radiation Oncology Journal
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• 제25권4호
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• pp.249-260
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• 2007

목적: 국내에서 시행되고 있는 세기변조 방사선 치료(IMRT)의 품질 향상을 위하여, 우편으로 시행하는 원격 품질보증 시스템을 개발하고, 이 시스템의 정확성 확인에 이어서, 국내 의료기관에서 타당성을 검증한다. 대상 및 방법: 원격 품질 보증 시스템은 두경부 팬톰과 IMRT의 치료계획 지침을 포함하는 사용자 설명서로 구성되어 있다. 두경부 용 팬톰은 내부에 CT영상에서 분별이 가능한 모사 치료표적(target)과 3개의 위험장기(좌, 우 이하선, 척추)를 포함하고 있으며, 각 모사 장기의 중심에서 열형광 소자(TLD)를 삽입하여 흡수 선량을 측정하도록 구성되어있다. 또한 2차원상의 선량분포를 확인 가능하도록 Gafchromic@EBT 필름을 2개의 평면에 삽입하도록 고안하였다. 고안된 팬톰과 사용자 설명서를 국내의 4개 기관에 보내어, 팬톰에 대한 IMRT치료계획을 수행하고 치료를 시행하였다. 치료계획 시 예측된 치료표적과 위험장기 내의 각 TLD에서 예측되는 절대 선량과 TLD의 측정값을 비교하였고, 횡단면에서 면의 중심을 지나는 2개의 직교하는 수평선과 수직선상에서 예측되는 상대적인 선량분포 값과 실제 측정값을 비교하였다. 결 과: 치료 표적에서의 선량측정 값은 모두 치료계획시의 예측값과 3% 오차 안에서 일치하였으나(평균오차, 1.5%), 좌우 이하선에 해당하는 위험장기에서는 최소 3.3%최대 19.8%의 차이를 보였다. 척추에 해당하는 위험장기에서의 오차의 범위는 $0.7{\sim}1.4%$였다. 2차원 선량분포는 3개 기관에 대한 자료를 분석하였는데, 직선상에서 예측 값과 5%이상의 차이를 보이는 비율이 수평선에서는 $7{\sim}27%$, 수직선상에서는 $7{\sim}14%$였다. 결 론: 본 연구에서 개발한 IMRT치료의 원격 품질보증 시스템과 사용자 설명서는 국내 시행이 가능한 상태로 판단된다. 그러나, 시행 시에 치료표적에서의 오차는 크지 않을 것으로 예상이 되지만, 위험장기에서의 오차는 클 것으로 예상되며, 이에 대한 방안이 마련돼야 할 것이며, 또한 임상의 중요성과 연관해 의미 있는 2차원 선량분포의 기준 마련이 요구된다.

• 생물환경조절학회지
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• 제18권3호
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• pp.215-224
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• 2009

공기유동 제어기술의 개발을 위한 기초자료를 제공 할 목적으로 토마토 재배 온실의 냉난방과 환기 및 공기유동 관련 실태를 조사하고, 온실유형과 난방방식별 온습도 분포를 실측하여 균일도를 분석하였다. 충남 부여 세도지역의 토마토 재배 온실 136농가를 대상으로 조사한 결과 대부분을 차지하는 단동 플라스틱 온실의 천창 설치 비율이 낮고 환기팬과 유동팬 설치비율도 매우 낮을 뿐만 아니라 설치제원도 편차가 매우 큰 것으로 나타났다. 아치형 단동 플라스틱온실의 천창 환기 구조의 개발보급과 연동곡부의 천창도 지붕상부로 이동시킬 필요가 있으며, 개별 천창구조 및 환기팬과 유동팬에 대한 설치 가이드라인의 제정이 요구된다. 냉방설비를 설치한 농가는 하나도 없었으며 난방방식의 대부분을 차지하는 온풍난방에서 덕트의 설치제원 역시 편차가 큰 것으로 나타났고, 온풍덕트의 배기풍속 및 배기온도 또한 거리에 따른 편차가 매우 큰 것으로 관측되었다. 수출경쟁력 화보를 위한 고품질의 생산물을 연중 안정적으로 생산하기 위해서는 온실냉방기술의 보급이 절실하며 난방방식이나 덕트설치 방식의 개선이 필요한 것으로 판단된다. 온실내 온습도 분포가 균일한지 여부를 판단하는 지표로 사용되고 있는 최대 편차와 실제 균등한 정도를 나타낼 수 있는 균일도와의 관계를 분석해 본 결과 높은 상관관계를 보였으나 주간에는 직선식으로 야간에는 2차 곡선식으로 다르게 표현되었다. 온습도 분포의 균일한 정도를 판정할 수 있는 객관적인 기준이 마련된다면 최대편차 대신 균일도를 지표로 사용하는 것이 더 합리적일 것으로 판단된다. 온실유형과 난방방식에 따라 온 습도분포의 균일도가 상당히 다른 것을 확인할 수 있었으며 야간에는 온수난방의 경우 이랑배관으로, 온풍난방의 경우 온풍덕트의 적절한 배치를 통하여, 주간에는 환기와 공기유동을 통하여 균일도를 개선할 수 있을 것으로 판단되었다.

• 대한기계학회논문집
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• 제10권6호
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• pp.823-829
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• 1986

본 연구에서는 와동의 대류속도를 H.H. Brunn의 방법과 달리 측정하였으며, 또 이를 이용하여 와동의 중심들 사이의 간격을 구하고자 한다. 이를 위하여 먼저 포텐셜코어영역(potential core region)과 혼합층영역(mixing layer region)의 경계 및 천이영역(transition region)과 난류영역(turbulent region)경계를 구하여야 한다. 각 영역들의 대체적인 구분은 Fig.1과 같다.