• 대한용접접합학회:학술대회논문집
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• 대한용접접합학회 2007년 추계학술발표대회 개요집
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• pp.199-202
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• 2007

The center floor is a part of underbody of cars. The assembling method is mostly a resistant spot welding. But the resistant spot welding has many demerits in productivity such as low welding speed, large spatter occurring, hard to verify the welding quality. The laser welding has many merits such as high welding speed, high static and dynamic weld strength. So the laser welding has been studied to substituted the resistant spot welding. Therefore, in this study, as a pre-evaluation stage for replacing the resistance spot welding with laser in production of automobile parts, the weldability of cold rolled and zinc coated steel sheets is studied and also evaluated the weld strength by the tensile shear test. And the shape of weld bead appearances and micro structure of the weld bead section is also evaluated.

• 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.

• 한국생활과학회지
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• 제8권1호
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• pp.165-178
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• 1999

Knitwears it was only for the innerwear, but which has become more available for sportswear and highly valuable formal-dresses for women's apparel and is set a trend toward high value-added products worldwide. Also the industry connected knitwears is more widely applicative than woven industry and is running on the well founded basement for the small enterprises. This study notes that what problems are caused and which utilities can be expected when we design knitwears by Primavision and Texpia CAD system considered the programs for development of domestic knitwears industry. There are much various benefits for designing knitwears from CAD system as shortening working hours, convenience, accuracy, quality control and productivity. It doesn't depend on designer's technique, sense and experiences, but provides, through building the design accuracy, chance to have a precise communication with buyers to be satisfied with the multiplicity, uniqueness and high-quality resulting from reducing the mistake on the operation. But there are some problems for using CAD design system those are no selections for the form, type and thickness of the yarn. Even though it is knitted by the same gauge, the texture conditions show complete difference if the form and thickness is different with. The gauge control without regarding those ought to be improved and the yarn designing function should be appended like in a tektite design. And the CAD design system can not reflect the variables of operating knitting machine and needle. The CAD design system provides the manufacturers with merits those they can change the colors easily to select which one appeals to the customer and check the effects of producing and modeling on monitor. But, in the each producing progress, there are still problems to reduce the practical steps, so intensive care is required of each part.

• 한국연초학회지
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• 제28권1호
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• pp.36-42
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• 2006

The papermaking process for a reconstituted tobacco sheet (RECON) has been preferred more because of the various merits such as a wide range of Recon products with better quality. The screw press is one of the very important process in RECON making process which divides the mixed raw materials into the soluble material and the insoluble material and could greatly affect the productivity and product quality. In this study, the characteristics of the screw press process in a Recon making mill were evaluated for two different RECON products. Three different efficiency index were proposed for the more detailed analysis of the screw press process. The result showed that the difference in the raw material might result in the difference in the efficiency and the properties of the extracts and the filter cake, especially in the HWS. The washing technique which applied in this experiment showed the amount of residual HWS in the fiber portion were not much changed by the each steps of the screw press.

• 한국건축시공학회지
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• 제23권6호
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• pp.809-820
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• 2023

현대 사회에서는 1인 가구가 증가하고 주거 공간에 대한 수요가 증가하고 있으며 이에 대한 적절한 대안 모색이 중요하다. 빠른 시간 내에 경제적이고 지속 가능한 주거 공간을 제공하기 위한 방법으로 모듈러 건축이 주목받고 있다. 본 연구에서는 BIM(Building Information Modeling) 기술을 활용한 모듈러 건축 유닛 설계 및 시공 과정 최적화 방법을 제안한다. 1인 가구의 주거 요구사항과 삶의 질 향상을 위한 요인을 분석하였다. 이를 바탕으로 BIM을 활용하여 효율적이고 경제적인 모듈러 공동주택 유닛을 개발하였다. BIM은 건축 요소의 시각화 및 상호 연결을 제공하여 설계 과정의 오류를 최소화하고 생산성을 향상시킬 수 있다. 모듈러 건축의 장점과 한계를 평가하였다. BIM을 활용한 모듈러 건축물은 주거 문제를 해결할 수 있는 효과적인 대안으로 제시될 수 있으며 주거 공간의 품질과 다양성을 높일 수 있다. 다만 기술적 요구사항 및 비용 등의 한계도 고려되어야 한다. BIM 기반 1인 가구 공동주택 유닛 설계의 가능성과 장점을 제시하고 1인 가구 개선을 위한 실질적인 해결책으로 활용될 수 있다.

• 한국토양비료학회지
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• 제5권1호
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• pp.9-15
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• 1972

새로 육종(育種)된 다수성(多收性) 품종인 IR677계통(수원 213 및 214)과 진흥(振興) 및 팔달(八達)을 사용 포장상태(圃場狀態)에서의 군란구조(群落構造)를 비교분석(比較分析)하여 다음과 같은 결과(結果)를 얻었다. 1) IR667계통 (IR8${\times}$Taichung Native 1${\times}$Yukara)은 군락(群落)높이가 낮고 개벽도(開蘖度)가 크며 개엽도(開葉度)가 적고 엽장비율(葉長比率)(지엽장(止葉長)/3엽장(葉長))이 적고 4+5절간장(節稈長)이 짧으며 5절간(節幹) 직경(直俓)이 커서 결과적으로 엽면적지수(葉面積指數)가 크며 수중형(穗重型)이고 엽중비율(葉重比率)(엽중(葉重)/엽초십간중)이 큰 장점을 갖는 반면 엽폭(葉幅)이 크고 엽수(葉數)(잎수/$m^2$)가 적고 비엽면적(比葉面積)( $cm^2/g$)이 적고 노화(老化)에 의한 군락파양율(군낙파양율)이 큰 단점(短點)을 갖고있다. 2) IR667 계통은 군락구조(群落構造)의 10개(個) 구성요소(構成要素)에 의한 구조(構造)의 평가방식(評價方法)으로 제안(提案) 한 "군락평점(群落評點)"이 훨씬 높으며 결과적으로 수량(收量)도 높았다. 3) 개별엽(個別葉)의 질(質)은 장려품종이 좋은때문에 보다 높은 수량을 위한 조합(組合)은 장려품종의 엽(葉)으로 IR667의 구조(構造)를 갖는 것이다.