• 한국진공학회:학술대회논문집
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• 한국진공학회 2012년도 제43회 하계 정기 학술대회 초록집
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• pp.369-369
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• 2012

The present work deals with selective deposition of copper on fluoropolymers patterned silicon (111) surfaces. The pattern of fluoropolymer was fabricated by nanoimprint lithography (NIL) and plasma reactive ion etching (RIE) was used to remove the residuals layers. Copper was electrochemically deposited in bare Si regions which were not covered with fluoropolymers. The patterns of fluoropolymers and copper have been investigated by scanning electron microscopy (SEM). In this work, we used two deposition methods. One is galvanic displacement method and another is electrodeposition. Selective deposition works in both cases and it shows applicability to other materials. By optimization of the deposition conditions can be achieved therefore this process represents a simple approach for a direct high resolution patterning of silicon surfaces.

• 대한치과의사협회지
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• 제58권11호
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• pp.700-712
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• 2020

The conventional mouthguard fabrication process consists of elastomeric impression taking and followed gypsum model making is now into intraoral scanning and direct mouthguard 3D printing with an additive manufacturing process. Also, dental professionals can get various diagnostic data collection such as facial scans, cone-beam CT, jaw motion tracking, and intraoral scan data to superimpose them for making virtual patient datasets. To print mouthguards, dental CAD software allows dental professionals to design mouthguards with ease. This article shows how to make 3D printed mouthguard step by step.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 1995년도 춘계학술대회 논문집
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• pp.81-85
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• 1995

A guide-wave electro-optical modulatored direct-ional coupler 1X2 was fabricated on LiNbO$_3$ by proton exchange with self-aligned method After proton exchange process, the waveguide is formed by annealing process, The relationship between refractive index change of waveguide and maximun output was studied a long the annealing time. A self-alinged method was used to simplify the fabrication process of the waveguide and the maximize the efficiency of electric field. The modulatored directional coupler 1${\times}$2 has very good figures of merits; The measured crosstalk was -29.5[dB] and the modulating voltage of 8.0[V].

• 한국광학회:학술대회논문집
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• 한국광학회 2002년도 하계학술발표회
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• pp.40-41
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• 2002

광 집적회로의 필요성에 의해 평면형 광소자의 개발이 다각도로 연구되고 있다. 그 중 유리의 광민감성을 이용한 것으로 직접 UV를 조사하여 광도파로를 만드는 방법이 최근 관심을 얻고 있다. 이러한 direct UV-writing 방법을 이용한 경우는 광도과로를 위한 식각 과정을 거치지 않고도 광도파로를 제작할 수 있는 장점이 있다. UV-writing을 이용한 광도파로 형성을 위해서는 undercladding층, core층, overcladding층으로 이루어진 구조의 박막을 제조해야 하며, 특히 빛이 도파되는 core 부분은 UV 조사에 따라 굴절률이 증가하는 광민감성이 높은 물질로 구성되어야 한다. UV조사에 따라 굴절률이 증가하는 광민감성이 높은 물질로 구성되어야 한다. (중략)

• 한국산업정보학회논문지
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• 제12권2호
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• pp.79-84
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• 2007

본 논문에서는 CMOS를 이용한 온도 제어회로를 MOSIS의 0.25um-3.3V CMOS 설계규칙에 따라 설계하고 SPICE 시뮬레이션과 실험을 통하여 성능을 검토하였다. 설계된 회로는 $0^{\circ}C{\sim}150^{\circ}C$의 온도 범위에 대하여 출력 전압이 약 $13mV/^{\circ}C$로 변화하며 좋은 온도 선형성을 나타내었다. 또한, 바이어스 전압을 변화시키면 온도변화에 대한 출력전압의 변화량을 조정할 수 있다. 제안된 회로는 온 칩 수정발진회로의 설계 등에 유용하게 사용될 수 있을 것으로 기대된다.

• 한국복합재료학회:학술대회논문집
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• 한국복합재료학회 2001년도 추계학술발표대회 논문집
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• pp.199-205
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• 2001

This paper describes the design methodology, manufacturing process, rebar tensile and bending properties. Braidtrusion is a direct Composite fabrication technique utilizing an in-line braiding and pultrusion process. The produced Composite rebar exhibits ductile stress-strain behavior similar to that of conventional steel bar. Various rebar diameters ranging from modeling scale(3m) to full-scale prototype of 9.5mm have been produced Glass Fiber Reinforced Plastics(GFRP) rebar were successfully fabricated at $\phi$8.5mm and $\phi$9.5mm nominal diameters of soild and hollow type using a braidtrusion process. Tensile and bending specimens were tested and compared with behavior of stress-strain of GFRP rebar and steel bar.

• 센서학회지
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• 제13권4호
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• pp.264-269
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• 2004

This paper describes on an advanced technology of 3C-SiC/Si(100) wafer direct bonding using PECVD oxide to intermediate layer for SiCOI(SiC-on-Insulator) structure because it has an attractive characteristics such as a lower thermal stress, deposition temperature, more quick deposition rate and higher bonding strength than common used poly-Si and thermal oxide. The PECVD oxide was characterized by ATR-FTIR. The bonding strength with variation of HF pre treatment condition was measured by tensile strength measurement system. After etch-back using TMAH solution, roughness of 3CSiC surface crystallinity and bonded interface was measured and analyzed by AFM, XRD, and SEM respectively.

• 한국재료학회:학술대회논문집
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• 한국재료학회 2011년도 추계학술발표대회
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• pp.3.1-3.1
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• 2011

Nanoengineered materials with advanced architectures are critical building blocks to modulate conventional material properties or amplify interface behavior for enhanced device performance. While several techniques exist for creating one dimensional heterostructures, electrospinning has emerged as a versatile, scalable, and cost-effective method to synthesize ultra-long nanofibers with controlled diameter (a few nanometres to several micrometres) and composition. In addition, different morphologies (e.g., nano-webs, beaded or smooth cylindrical fibers, and nanoribbons) and structures (e.g., core-.shell, hollow, branched, helical and porous structures) can be readily obtained by controlling different processing parameters. Although various nanofibers including polymers, carbon, ceramics and metals have been synthesized using direct electrospinning or through post-spinning processes, limited works were reported on the compound semiconducting nanofibers because of incompatibility of precursors. In this work, we combined electrospinning and galvanic displacement reaction to demonstrate cost-effective high throughput fabrication of ultra-long hollow semiconducting chalcogen and chalcogenide nanofibers. This procedure exploits electrospinning to fabricate ultra-long sacrificial nanofibers with controlled dimensions, morphology, and crystal structures, providing a large material database to tune electrode potentials, thereby imparting control over the composition and shape of the nanostructures that evolved during galvanic displacement reaction.

• 한국정밀공학회지
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• 제21권12호
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• pp.160-166
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• 2004

Self-Assembled Monolayers(SAMs) by alkanethiol adsorption to thin metal film are widely being investigated fer applications as coating layer for anti-stiction or friction reduction and in fabrication of micro structure of molecule and bio molecule. Recently, there have been many researches on micro patterning using the advantages of very thin thickness and etching resistance of Self-Assembled Monolayers in selective etching of thin metal film. In this report, we present the several machining method to form the nanoscale structure by Mask-Less laser patterning using alknanethiolate Self-Assembled Monolayers such as thin metal film etching and heterogeneous SAMs structure formation.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2009년도 춘계학술대회 논문집
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• pp.96-98
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• 2009

This report summarizes our recent efforts to produce large-grained CIGS materials from porous nanoparticle thin films. In our approach, a $Cu_xSe$ nanoparticle colloid were first prepared by reacting a mixture of CuI in pyridine with $Na_2Se$ in methanol at reduced temperature. purified colloid was sprayed onto heated molybdenum-coated sodalime glass substrates to form thin film. After thermal processing of the thin film under a selenium ambient. $Cu_xSe$ colloid and thin film were characterized by scanning electron microscopy, x-ray diffraction. The optical(direct) band gap energy of $Cu_xSe$ thin films is 1.5 eV.