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MRF기법을 이용한 하이브리드 차량용 교류발전기 냉각 팬 유동해석
송상우(Sangwoo Song),허남건(Nahmkeon Hur),권정기(Jungki Kwon) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
In this research, the main purpose is to investigate the alternator cooling fan performance. The CFD simulation has been performed for various inlet/outlet angles and the flow fields is compared. The realizable k-ε turbulence model is used and for the rotating effect the MRF method is applied. The rotation speed is set up to 2000 rpm and the number of blades is set up to 11. As a result influence of inlet/outlet angles and air temperature on cooling fan performance is analyzed.
차압식 유량계를 실장을 위한 Single Capacitive Type Differential 압력 센서 개발
신규식,송상우,이경일,이대성,정재필,Shin, Kyu-Sik,Song, Sangwoo,Lee, Kyungil,Lee, Daesung,Jung, Jae Pil 한국마이크로전자및패키징학회 2017 마이크로전자 및 패키징학회지 Vol.24 No.1
In this paper, we have developed a differential pressure flow sensor designed as a single capacitive type. And the sensor was fabricated using a MEMS process. Differential pressure flow sensors are the most commonly used sensors for industrial applications. The sensing diaphragm and bonding joint of the MEMS pressure sensor are easily broken at high pressure. In this paper, we proposed a structure in which the diaphragm of the sensor was not broken at a pressure exceeding the proof pressure, and the differential pressure sensor was designed and manufactured accordingly. The operating characteristics of the sensor were evaluated at a pressure three times higher than the sensor operating pressure (0-3 bar). The developed sensor was $3.0{\times}3.0mm$ and measured with a LCR meter (HP 4284a) at a pressure between 0 and 3 bar. It showed 3.67 pF at 0 bar and 5.13 pF at 3 bar. The sensor operating pressure (0-3 bar) developed a pressure sensor with hysteresis of 0.37%. 최근 계측기의 소형화, 전자화에 따라 차압식 유량계의 경우 기존에 기계가공을 통해 개발하던 센서부를 전자식 MEMS 차압센서로 대체하려는 많은 노력이 있으나, MEMS 차압센서의 경우 고압이 인가시 실리콘 다이아프램의 파괴 및 센서의 접합부의 파괴가 발생하는 문제점이 있다. 따라서 본 논문에서는 proof pressure 이상의 압력에서 센서의 다이아프램이 파괴되지 않는 구조를 제안하였으며, 그에 따른 차압식 압력센서를 설계 및 제작하였다. 센서 동작압력(0-3 bar)의 3배 이상의 압력에서 센서의 동작특성을 평가하였다. 개발된 센서는 $3.0{\times}3.0mm$이며, 0~3 bar 사이의 압력에서 LCR meter (HP 4284a)로 측정한 결과 3.67 pF at 0bar, 5.13 pF at 3 bar를 나타내었으며, 센서의 동작압력(0-3 bar)에서 0.37%의 hysteresis를 나타내는 압력센서를 개발하였다.
저온 소성용 TiO₂ 페이스트를 이용한 유연 염료감응 태양전지 제작
이혁수(Hugs Lee),송상우(Sangwoo Song),조만식(Mansik Jo),조슬기(Seulki Jo),김동우(Dongwoo Kim),성창현(Changhyun Sung),문병무(Byungmoo Moon) 한국신재생에너지학회 2017 신재생에너지 Vol.13 No.1
This study examined the production of flexible dye-sensitized solar cells (DSSCs). The heat treatment temperature of the TiO₂ working electrode needs to be lowered before it can be used on flexible substrate. Therefore a low-temperature sintering paste was developed using commercially available TiO₂ nano-particles (P25). The TiO₂ paste was prepared by changing the amount of titanium isoproxide (TTIP) as a binder. Photo-electrodes were prepared using the commercially available and home-made TiO₂ paste for comparison. The DSSCs using home-made TiO₂ paste showed a power conversion efficiency (PCE) of 4.167%.
박재호(Park, Jaeho),이경주(Lee, Kyungju),송상우(Song, Sangwoo),조슬기(Jo, Seulki),문병무(Moon, Byungmoo) 한국신재생에너지학회 2011 한국신재생에너지학회 학술대회논문집 Vol.2011 No.11
Dye-sensitized solar cells(DSSCs) have been recognized as an alternative to the conventional p-n junction solar cells because of their simple fabrication process, low production cost, and transparency. A typical DSSC consists of a transparent conductive oxide (TCO) electrode, a dye-sensitized oxide semiconductor nanoparticle layer, liquid redox electrolyte, and a Pt-counter electrode. In dye-sensitized solar cells, charge recombination processes at interfaces between coducting glass, TiO₂, dye, and electrolyte play an important role in limiting the photon-to-electron conversion efficiency. A layer of ZTO thin film less than ~200nm in thickness, as a blocking layer, was deposited by DC magnetron sputtering method directly onto the anode electrode to be isolated from the electrolyte in dye-sensitized solar cells(DSCs). This is to prevent the electrons from back-transferring from the electrode to the electrolyte (I^-/I₃^-). The presented DSCs were fabricated with working electrode of Ga-doped ZnO glass coated with blocking ZTO layer, dye-attached nanoporous TiO₂ layer, gel electrolyte and counter electrode of Pt-deposited GZO glass. The effects of blocking layer were studied with respect to impedance and conversion efficiency of the cells.
Study on TiO<sub>2</sub> nanoparticle for Photoelectrode in Dye-sensitized Solar Cell
조슬기(Jo, Seulki),이경주(Lee, Kyungjoo),송상우(Song, Sangwoo),박재호(Park, Jaeho),문병무(Moon, Byungmoo) 한국신재생에너지학회 2011 한국신재생에너지학회 학술대회논문집 Vol.2011 No.11
Dye-sensitized solar cells (DSSC) have recently been developed as a cost-effective photovoltaic system due to their low-cost materials and facile processing. The production of DSSC involves chemical and thermal processes but no vacuum is involved. Therefore, DSSC can be fabricated without using expensive equipment. The use of dyes and nanocrystalline TiO₂ is one of the most promising approaches to realize both high performance and low cost. The efficiency of the DSSC changes consequently in the particle size, morphology, crystallization and surface state of the TiO₂. Nanocrystalline TiO₂ materials have been widely used as a photo catalyst and an electron collector in DSSC. Front electrode in DSSC are required to have an extremely high porosity and surface area such that the dyes can be sufficiently adsorbed and be electronically interconnected, resulting in the efficient generation of photocurrent within cells. In this study, DSSC were fabricated by an screen printing for the TiO₂ thin film. TiO₂ nanoparticles characterized by X-ray diffractometer (XRD) and scanning electron microscope (SEM) and scanning auger microscopy (SAM) and zeta potential and electrochemical impedance spectroscopy(EIS).In addition, DSSC module was modeled and simulated using the SILVACO TCAD software program. Improve the efficiency of DSSC, the effect of TiO₂ thin film thickness and TiO₂ nanoparticle size was investigated by SILVACO TCAD software program.
납-비스무스 공융물 환경에서의 적층제조된 재료의 부식 거동 연구
김태용(Taeyong Kim),김병주(Byeongju Kim),김기동(Gidong Kim),송상우(Sangwoo Song),김지현(Ji Hyun Kim) 대한기계학회 2022 대한기계학회 춘추학술대회 Vol.2022 No.11
This paper study on LBE corrosion behavior of clad material manufactured by direct energy deposition . Fe-12Cr-2Si alloys, which is corrosion resistance material with clad, are immersed in 550 ℃, 1e-7 wt.% dissolved oxygen concentration static LBE. At the same time, SS316L clad are also exposed to same condition. Through a scanning electron microscope, corroded cross-section of clad Fe-12Cr-2Si, clad SS316L and as-received SS316L are compared. The clad Fe-12Cr-2Si shows more enhanced corrosion resistance than as-received Fe-12Cr-2Si because grain size of the clad is bigger so that diffusion paths like grain boundaries decrease. On the other hand, corrosion resistance of the clad SS316L is inferior to as-received SS316L. When passive layer is not sufficient, solub le Ni in LBE is easy to diffuse not only grain boundary but also grain. Larger grain which has high diffusivity along crystal plane locally, deeper the dissolution and LBE penetration depth.
HIP 공정이 PBF 기반 스테인리스강 316L 적층 소재의 피로 성능에 미치는 영향
오동진(Dongjin Oh),강용준(Yongjoon Kang),김기동(Gidong Kim),박소영(Soyoung Park),송상우(Sangwoo Song) 대한용접·접합학회 2020 대한용접·접합학회지 Vol.38 No.1
Additive manufacturing (AM) is an interesting technology with the potential to replace general fabrication techniques such as machining, forming and casting. AM provides two main benefits: greater freedom of part design and lower material consumption. To improve quality, many researchers have investigated the mechanical characteristics of AM products and additive parameters. In the present study, tensile and fatigue tests were conducted on stainless steel (SS) 316L manufactured using powder bed fusion (PBF) technology. These tests were carried out using two different building directions, along the Z and X axis, to investigate the effect of additive direction. In addition, the effects of hot isostatic pressing (HIP) related to fatigue properties, which can influence the volume density and porosity of the specimen, was studied. Based on the test results, changes in the mechanical characteristic and fatigue strength due to the HIP treatment were investigated.
적층제조된 316L 스테인리스강 용접금속의 응고균열 감수성
박소영(So-Young Park),강용준(Yongjoon Kang),오동진(Dongjin Oh),송상우(Sangwoo Song),홍현욱(Hyun-Uk Hong) 대한용접·접합학회 2021 대한용접·접합학회지 Vol.39 No.1
In this study, the solidification cracking susceptibility of the weld metal of additively manufactured 316L stainless steel was investigated. Laser powder bed fusion was employed to fabricate rectangular specimens with a thickness of 4 mm, and Trans-Varestraint tests were performed to evaluate the weldability of the specimens. Subsequently, the maximum crack lengths were measured and used as indices of susceptibility. The results showed that the weld metal of additively manufactured 316L stainless steel had higher susceptibility to solidification cracking than that of conventional wrought 316L stainless steel. The high susceptibility was considered mainly due to the primary austenite solidification mode in the weld metal of the additively manufactured specimen having a relatively higher content of nitrogen.