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기계학습 알고리즘을 이용한 반도체 테스트공정의 불량 예측
장수열,조만식,조슬기,문병무,Jang, Suyeol,Jo, Mansik,Cho, Seulki,Moon, Byungmoo 한국전기전자재료학회 2018 전기전자재료학회논문지 Vol.31 No.7
Because of the rapidly changing environment and high uncertainties, the semiconductor industry is in need of appropriate forecasting technology. In particular, both the cost and time in the test process are increasing because the process becomes complicated and there are more factors to consider. In this paper, we propose a prediction model that predicts a final "good" or "bad" on the basis of preconditioning test data generated in the semiconductor test process. The proposed prediction model solves the classification and regression problems that are often dealt with in the semiconductor process and constructs a reliable prediction model. We also implemented a prediction model through various machine learning algorithms. We compared the performance of the prediction models constructed through each algorithm. Actual data of the semiconductor test process was used for accurate prediction model construction and effective test verification.
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.
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%.
Backlash제거를 위해 Multi-Magnet Disc를 이용한 절대각 센서
박성우(Sungwoo Park),노지형(Jihyoung Roh),전민석(Minseok Jeon),남철(Chul Nam),표재우(Jaewoo Pyo),이석우(Seagwoo Lee),공준호(Junho Gohng),문병무(Byungmoo moon),이대성(Daesung Lee) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
These days absolute steering angular sensor(SAS) is used in vehicles as a component of electric power steering, anti-collision system, ASS/ESP, auto light system, auto parking system and so on. A number of SASs are developed and used in companies and research institution. The sensors are mostly magnetic type because of non-contact type and prevention of pollution. Most magnetic type SAS have used AMR sensors and gears. But this method has the backlash problem. So we use a multi-magnet disc for elimination of backlash without gears. Hall IC is used to SAS for multi-magnet's magnetic flux is measured. As a result, characteristics of this method are resolution which is 0.014° and elimination of backlash problem.