• 전자공학회논문지D
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• 제35D권7호
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• pp.17-24
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• 1998

We proposed a novel bondwire inductor buried in plastic package for low cost MMIC and characaterized the electrical perofmrance in a wide frequency range using the full-wave analysis of finite element method(FEM), and then we fabricated and measured the scale-up model in order to prove the characteristics. Th ebondwire inductor has higher quality factor and higher cutoff frequency than the conventional spiral inductor designed n the same area as the bondwire inductor. Since the air-bridge process is not requried for the bondwire inductor, it is very suitable for low cost plastic-packaged MMIC production. The bondwire inductor has the field distribution localized around the bondwire inductor and hence is more compatible to the crosstalk problems.

• Journal of Welding and Joining
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• 제18권4호
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• pp.64-69
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• 2000

Reliability of PBGA(Plastic Ball Grid Array) package is very weak compared with normal plastic packages. The reliability are the lower resistance to popcorn cracking, which is reduced by moisture absorption in PCB(Printed Circuit Board). This paper adapts plasma treatment process and analyzes their effect. The contents of C and Cl decrease after plasma treatment but O, Ca and N relatively increase. The Plasma treatment to improve the adhesion between EMC(Epoxy Molding Compound) and PCB(solder mask). The degree of improvement was over 100% Max., which is depend on the properties of EMC. Ar+H$_2$as plasma gas show good result. There is a little difference in RF power and treatment time.

• 산업경영시스템학회지
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• 제18권34호
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• pp.35-42
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• 1995

In the plastic extrusion process, product quality is influenced by work condition for temperature of cylinders and dies. The work conditions are various, so it is difficult to standardization of the work conditions. Therefore, the work conditions are depended on the workers of experience and skill. In the plastic extrusion process, it has five control heating points on the cylinder and three control heating points on the die. In addition, there is one control point on the extrusion process. It is extrusion speed. In this case, we don't know how these affect product quality. We structure the multiple linear regression equation with the temperature of cylinders and dies as independent variables and the product weight as dependent variable. We solve this equation using statistic computer package named Juse-Qcas.

• 한국식품과학회지
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• 제41권3호
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• pp.272-277
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• 2009

포장된 두부의 유통기간 중 두부 포장재를 통해 유입되는 산소량에 따른 두부 및 충진수에 미생물 성장률을 기준으로 두부의 유통기간을 예측하고자 하였다. 미생물 균의 성장 및 두부 포장재를 통해 유입된 산소량의 변화를 3차원적 수치 묘사의 수학적 모델로 정량적으로 예측하였으며, 이를 위해 산소의 확산 메커니즘 원리를 고려한 유한차분해석법을 적용하여 개발하였다. 3차원적 수치묘사의 수학적 모델을 통한 예측 결과는 미생물의 수가 두부 제품보다 충진수에 더 높은 것으로 나타났다. 따라서 포장된 두부의 유통기간은 두부 제품의 미생물 수뿐만 아니라 충진수의 미생물 수에도 영향을 끼치리라 예측된다. 두부 제품의 물리적 특성, 적용된 포장재의 산소투과율 및 충진수의 깊이 등에 따라 포장된 두부의 유통기간에 영향을 주는 것을 관찰하였다.

• Food Science and Biotechnology
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• 제14권5호
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• pp.694-697
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• 2005

The objectives of this study were to compare the quality changes of cheese slices individually packed in four kinds of edible pouches in order to select the most suitable variety for individual packaging. The edible Z2 pouch (zein with oleic acid) was selected as maintaining the best cheese qualities based on the physical and microbiological changes undergone by the samples over 4-week storage at $5^{\circ}C$. The cheese sample individually packed in Z2 inner edible pouch and repacked in a plastic (OPP/LLDPE) outer pouch was not significantly different in physical and microbiological changes from that individually packed in a plastic (OPP/LLDPE) inner pouch and repacked in a plastic (OPP/LLDPE) outer pouch. Therefore, it may be concluded on the basis of the physical and microbiological evidence that the Z2 edible pouch can be used as an inner package for cheese slices when it is inside a plastic outer pouch.

• 한국포장학회지
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• 제19권2호
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• pp.103-108
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• 2013

본 연구는 국내와 일본에서 판매하는 소금 중 본 연구의 주 관심 대상인 천일염의 패키지 디자인 요소에 해당되는 포장재별 용량에 따른 형태와 패키지 색채 및 그래픽을 비교분석하였다. 국내산 천일염과 일본산 천일염의 패키지 디자인의 형태와 비주얼 요소들을 비교, 분석한 결과, 형태는 용량에 따라 구분이 명확하게 나타났다. 국내산 천일염은 다양한 재질과 형태의 디자인을 적용하는 반면 일본산 천일염의 경우 300 g미만은 플라스틱 소재의 스탠드 파우치형을 적용하고 300 g이상은 플라스틱 소재의 파우치형을 적용하는 것으로 나타났다. 국내산 천일염은 용량에 관계없이 플라스틱 소재의 스탠딩 파우치형을 많이 적용하고 있고 스탠딩 파우치는 개폐방식이 지퍼식으로 되어 있어서 보관이나 사용면에서 편의성이 높은 것으로 나타났다. 비주얼 요소에서 색상과 그래픽을 비교 분석한 결과, 국내산 천일염은 미네랄이 풍부하고 신안지역 섬에서 생산한다는 지역적인 특성을 살려 구체적인 염전과 염부의 그래픽을 많이 애용하고 있다. 따라서 바다의 상징적인 그래픽을 적용하는 일본과는 차별화가 뚜렷하고 색상에 있어서도 소금을 상징하는 흰색을 주조색으로 적용하고 있다. 염전과 갯벌에서 연상되는 흰색과 갈색을 통해 천일염만의 독특한 아이덴티티 색상을 나타냈다.

• 마이크로전자및패키징학회지
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• 제13권4호
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• pp.17-25
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• 2006

본 논문에서는 FC-PBGA 패키지를 대상으로 하여 온도변화에 따른 열변형에 대한 실험과 해석을 수행하였다. 모아레 간섭계를 이용하여 각 온도단계에서 변위분포를 나타내는 간섭무늬를 얻고, 그로부터 굽힘변형 거동 및 솔더볼의 변형률에 대한 해석을 수행하였다. 한 개의 패키지가 PCB에 연결되어 있는 단면 패키지 결합체와 두 개의 패키지가 PCB의 양쪽에 연결되어 있는 양면 패키지 결합체의 변형 거동을 비교하였다. FC-PBGA의 단면 패키지 결합체 패키지의 최대 굽힘변위는 결합되지 않은 패키지보다 20%정도 작게 발생된 것으로 나타났으며 앙면 패키지의 경우는 대칭성으로 인하여 칩 윗면의 최대 굽힘변위가 단면패키지보다 반 정도 작게 발생되었다. 솔더볼의 파손에 큰 영향을 미치는 유효변형률은 단면 패키지 결합체의 경우 칩 가장자리의 바로 바깥쪽 솔더볼에서, 양면 패키지 결합체의 경우는 칩 가장자리의 바로 안쪽 솔더볼에서 가장 큰 값을 가졌으며, 그 최대값은 양면패키지 결합체의 경우가 50%정도 더 큰 것으로 나타났다.

• 한국포장학회지
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• 제10권1호
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• pp.1-6
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• 2004

Amount of residual ink solvent on the packaging materials from Korea, Japan and Europe was measured and compared. The amount of packaging materials from Korea was much higher than that of Japan and Europe. To reduce the residual amounts of ink solvent, aging condition of printed packaging materials including aging time and temperature was modified and evaluated. Aging with high temperature and short time ($60^{\circ}C$ and 24 hours) was more effective for reduction of residual amount of ink solvent than that with low temperature and long time. To find out change of reduction pattern of residual amount of solvent according to plastic packaging material, several monolayer and multilayer packaging materials were selected. Among the monolayer packaging materials, the amount of EVOH and PET was lower than that of polyolefin plastic film including PE and PP. PP/EVOH/PET among the selected multilayer film showed the lowest amount of residual ink solvent on food packaging materials. Result of this research revealed that the residual amount of ink solvent can be reduced by proper selection of aging condition with and by appropriate application of mutilayer plastic film.

• 한국의류산업학회지
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• 제19권1호
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• pp.30-39
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• 2017

This study examines on the relationship of appearance instrumentality and appearance-related variables (appearance concern, appearance management behavior) of college students. Questionnaires were administered to 313 college students living in Daegu. The SPSS 20.0 package was utilized for data analysis which included frequency analysis, Cronbach's ${\alpha}$, factor analysis, cluster analysis, cross tabulation analysis and t-test. Three factors of appearance instrumentality(love relationship, social achievement, interpersonal relationship), two groups of appearance concern(high, low) and five factors of appearance management behavior(skin care/cosmetics usage behavior, body management behavior, plastic surgery behavior, hair management behavior, fashion management behavior) were utilized for the problem analysis of the study. The results of this study were: First, there was no significant differences in the appearance concern group according to appearance instrumentality. Second, appearance instrumentality had a significant differences on appearance management behavior. Social achievement showed a significant differences in plastic surgery behavior. And love relationship showed a significant differences on plastic surgery behavior and fashion management behavior. Third, the appearance concern had a significant differences on all of appearance management behavior. High group of appearance concern showed a higher average than low group of appearance concern in fashion management behavior, skin care/cosmetics usage behavior, hair management behavior, plastic surgery behavior, body management behavior.

• 한국정밀공학회지
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• 제14권12호
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• pp.73-85
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• 1997

The rolling force and roll deformation behavior in the twin roll type strip continuous casting process has been computed to estimate the thermal charcteristics of a caster roll. To calculation of rolling force, the relationship between flow stress and strain for a roll material and casting alloy are assumed as a function of strain-rate and temperature because mechanical properties of a casting materials depends on tempera- ture. The three dimensional thermal dlastic-plastic analysis of a cooling roll has also been carried out to obtain a roll stress and plastic strain distributions with the commercial finite element analysis package of ANSYS. Temperature fields data of caster roll which are provided by authors were used to estimated of roll deformation. Roll life considering thermal cycle is calculated by using thermal elastic-plastic analysis results. Roll life is proposed as a terms of a roll revolution in the caster roll with and without fine failure model on the roll surface. To obtain of plastic strain distributions of caster roll, thermomechan- ical properties of roll sleeve with a copper alloy is obtained by uniaxial tensile test for variation of temperature.