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RISS 인기검색어
- 검색키워드
- 저자 : Fariza, Dian Prasetyo (검색결과 3 건)
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(A) study on micro-dot printing and its application by using electrohydrodynamic jet printing
Fariza, Dian Prasetyo Sungkyunkwan University 2013 국내석사
Electrohydrodynamics (EHD) jet printing technology has been chosen as the main alternatives for overcoming the limitation of the conventional lithography fabrication process. This printing technology provides relatively low-cost, simple fabrication process of the micro-devices. Compared with the conventional inkjet printing, the EHD jet printing is able to realize below 20 µm patterning even though with high viscosity ink. The main objective of this thesis is performing the basic study of the tiny patterning below 20 µm by using EHD jet printing focused on the dot printing realized by drop-on-demand (DoD) ejection mode. In this study, both ink type conductive and non-conductive ink were used. Silver (Ag) nano-particles ink and UV-curable photopolymer ink was used as the conductive and non conductive ink respectively. In the real application, the dot patterned with photopolymer material is mostly used for the micro-lens and micro-lens arrays fabrication. Therefore this thesis also presents the study of the micro-lens and micro-lens arrays fabrication on the flexible substrate as the implementation of dot printing real application. Finally this thesis presents the analysis of the dot uniformity and the effect of some physical parameters including the temperature and the surface wettability of the printing substrate on the dot morphologies. This study shows that the uniform Ag dots below 10 µm could be realized by using EHD jet printing. The dot diameter increased up to 14 µm while the substrate was heat up to 40 0C. Furthermore this study shows that the EHD jet printing technology could be used as the breakthrough for the low-cost and rapid fabrication of tiny micro-lens and micro-lens array on the flexible substrate. The optical parameters of the micro-lens could be adjusted as controlling the printing drop number during printing process. The minimum and maximum micro-lens diameter could be fabricated was 11.92 μm and 24.4 μm respectively.
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Influence of Winter Monsoon on Cloud Thermodynamic Phase over Central and South-East Asia
Mustafan, Wan Fariza Binti 이화여자대학교 대학원 2015 국내석사
Previous studies stated that ice crystal number concentration (Ni) - give a strong constraint on the calculation of cloud radiative forcing (CRF) and become an important parameter for studying the general circulation of the atmosphere. Thus, it is important to study both the microphysical and dynamical processes in order to understand the factors disturbing the natural relationship between Ni and temperature. Here, we investigated the relationship between cloud thermodynamic phase at -20°C isotherm and Winter Monsoon (November to March) over Central Asia (Tibet, latitudes 31°N to 45°N and longitude 75°E to 105°E) and South-East Asia (SEA, latitudes 10°S to 20°N and longitude 95°E to 130°E) by analyzing the vertical profile of Cloud Aerosol Lidar with Orthogonal Polarization (CALIOP). Attention was paid on Tibet and SEA as these regions showed significant reduction in supercooled liquid cloud fraction (SCF) values during the Winter Monsoon. We found that the formation of cirrus cloud over Tibetan plateau tends to reduce SCF by 20 % and the formation of deep convective clouds over the SEA tends to reduce SCF by approximately 18 %. We suggested that the reduction of SCFs highly corresponding to the formation of cirrus clouds by ice nucleation and secondary ice crystal in deep convective clouds by ice multiplication processes. In this study, we described the relevant mechanism by using the satellite data that show how the Winter Monsoon change the liquid and ice cloud fraction of mixed-phase clouds in Tibet and SEA regions 이전 연구에 의하면 얼음 입자 수농도(Ni)는 구름복사강제력의 계산에 영향을 주어 대기 대순환의 연구에도 중요한 값이다. 따라서 Ni와 온도와의 자연적 관계를 깨는 여러 요인들을 이해하기 위해 미세물리적, 역학적 과정들을 연구하는 것은 매우 중요하다. 본 연구에서는 CALIOP 위성의 연직분포 자료를 분석하여 중앙아시아(티벳)과 동남아시아(SEA)에서 겨울몬순과 -20°C 등온면에서의 구름상과의 상관관계를 보였다. 티벳과 SEA지역에 집중한 이유는 겨울몬순 기간에 이 지역에서 과냉각수적비율(SCF)이 현저히 감소하였기 때문이다. 티벳 고원에서는 권운의 형성으로 SCF 20%가 감소하며, SEA에서는 깊은 대류운의 형성으로 SCF 18%가 감소하였다. 권운은 얼음의 핵생성 과정에 의해, 깊은 대류운에서는 빙정 증가(ice multiplication)에 의해 SCF가 감소하는 것으로 사료된다.본 연구에서는 인공위성 관측자료를 사용하여 관련 메커니즘을 묘사함으로써, 겨울몬순이 티벳과 SEA지역의 혼합상 구름의 수적 또는 빙정 구름의 비율을 어떻게 줄이는지를 설명하였다.
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Estimating households' demand for access to and usage of wireless and local telephone services
Ahmad, Fariza University of Illinois at Urbana-Champaign 2002 해외박사(DDOD)
This research examines households' access and usage demand for wireless service, local telephone service and additional telephone line(s). Households are quite responsive to prices when deciding to subscribe to and use wireless service. Wireless access and usage prices have negative impact on wireless subscription, while local telephone access price has positive impact. The magnitude of the own-price elasticity are between −0.45 and −0.52, while the magnitude of the cross-price elasticity are between 0.12 and 0.24. Positive cross-price effect supports the hypothesis that access to wireless and local telephone services are substitutes. Moreover, a more elastic wireless usage demand is observed, with own-price elasticity ranges from −0.66 to −2.29. However, the cross-price effect is not significant. Consistent to prior studies, I find a very inelastic local telephone access demand, with own-price elasticity of −0.002. However, households are more responsive to prices in the access demand for an additional telephone line, with own price elasticity ranges from −0.42 to −0.54. With respect to cross-price effect, households perceive wireless service and another telephone line as complements and later as substitutes. In addition, households are also responsive to the prices when making local toll calls, but a mixed cross-price effect is observed. Although I hypothesize that households' responsiveness to prices increase over time, this hypothesis is not supported, except in the wireless usage demand. Furthermore, the hypothesis that households having multiple telephone lines or wireless service are more responsive to prices than those not having the service is supported. The findings also indicate the importance of households' demographic characteristics, telecommunications intensity, cellular market characteristics and quality of services in all demand models. Finally, the finding that wireless and local telephone services are substitutes indicates that wireless service is a competing service to local telephone service, especially when households decide to purchase another telephone line. Thus, policy makers and regulators can treat wireless service as a competing provider in the local telephone market. Moreover, the research findings also suggest the use of wireless service as an alternative to local telephone in an effort to promote a universal telephone service to the U.S. households.
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