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High performance quantum dot light emitting devices via surface engineering
박종남 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
InP quantum dots (QDs) are non-toxic emitters, which are considered an alternative to CdSe-based QDs. However, the limited choice and high cost of P precursors have a negative impact on their practical applicability. Here, we report the largescale synthesis of highly luminescent InP@ZnS QDs from an elemental P precursor (P<sub>4</sub>), which was simply synthesized via the sublimation of red P powder. In addition, all-inorganic perovskite quantum dots (PeQDs) based light-emitting devices (LEDs) was fabricated using CsPbX<sub>3</sub> QDs by a solid-state ligand exchange with aromatic acid/amine. The improvement in the overall photoemission efficiency of the resulting LED was confirmed under red, green, and blue conditions, demonstrating the luminance of 1889 cd/㎡ and a current efficiency of 6.28 cd/A was achieved.
박종남,노승희,이동길 한국산학기술학회 2019 한국산학기술학회논문지 Vol.20 No.11
Generally, end effectors for automatic robots can use ceramics such as alumina(Al2O3) and silicon carbide(SiC). In this study, black alumina was developed and used in the semiconductor field through powder molding press forming. The black alumina can be mass produced.Alumina and black alumina were ground using a plane grinder to apply to the end effector of an automatic robot. The optimal cutting conditionswere found by analyzing the surface roughness(Ra) of black alumina through grinding. The alumina surface roughness is the feed rate was about 0.72 mm/sec, and the number of revolutions was best at 0.4879 ㎛ at 1700 rpm. In addition, the black alumina surface roughness shows a precision of less than 0.2 ㎛ in most cutting conditions. The feed rate was about 0.72 mm/sec, and the number of revolutions was best at 0.1361 ㎛ at 1900 rpm. The surface roughness of black alumina was better than that of alumina by about 0.35 to 0.47 ㎛. 반도체 시장에서 소재 개발 및 제조 공법에 대한 연구는 꾸준히 진행되고 있다. 일반적으로 자동 로봇용 End Effector는 알루미나(Al2O3)와 탄화규소(SiC) 등의 세라믹이 사용되었다. 본 연구는 대량생산이 가능한 분말 성형 프레스 법을 통해 반도체 현장에서 사용되는 블랙 알루미나를 개발하였다. 그리고 알루미나와 블랙 알루미나를 자동 로봇의 End Effector에 적용될 수 있도록 평면 연삭기를 사용하여 연삭가공을 실시하였다. 연삭가공을 통해 블랙 알루미나 대한 표면 거칠기(Ra)를 비교 · 분석하여 최적의 절삭 조건을 확인 할 수 있었다. 알루미나 표면 거칠기는 이송 속도가 0.72 ㎜/sec이고 회전수가 1,700 rpm에서 0.4876 ㎛로 가장 양호하였다. 블랙 알루미나 표면 거칠기는 대부분의 절삭 조건에서 0.2 ㎛이하의 정밀도를 나타내었으며, 이송 속도가 0.72 ㎜/sec이고 회전수가 1,900 rpm에서 0.1364 ㎛로 가장 양호하였다. 블랙 알루미나의 표면 거칠기는 알루미나 보다 0.35 ㎛ ~ 0.47 ㎛ 정도 양호하였다.
자동차용 피스톤 핀의 전.후방압출에서 유동제어에 관한 실험적 연구
박종남,박태준,김동환,김병민,Park, Jong-Nam,Park, Tae-Joon,Kim, Dong-Hwan,Kim, Byung-Min 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.7
In cold forging of piston-pin for automobile parts, the flow defect appears by the dead metal zone. This appearance evidently happens in products with a thin piercing thickness for the dimension accuracy and the decrease of material loss. The best method that can prevent flow defect is removing dead metal zone. The purpose of this study is to investigate the material flow behavior of forward-backward extruded piston-pin through the relative velocity ratio and the stroke control of upper moving punch & container using the flow control forming technique. The finite element simulations are applied to analyse the flow defect, then the results are compared with the plasticine model material experiments. The model experiment results are in good agreement with the FE simulation ones.
박종남 동아대학교 공과대학 부설 한국자원개발연구소 1990 硏究報告 Vol.14 No.1
Study was made on the characteristics of the Walsh power spectrum, particularly in terms of bias and variance of the estimate againt the true power spectrum, in order to provide basic infomations for geophysical data analysis. Random data for the analysis have been derived from an autoregression equation, Xi+1=a*Xi+Ni where a is a constant, indicating degrees of correlations beween neihboring data, and Ni the random noise. In this study, three different values of a, that is, a=-0.9, -0.5, and -0.1 are used for the autoregression. It is confirmed that the power spectra are much dependent upon the characteristics of the input data. In case of the input data which have high correlations between neighboring data, the optimum condition for the spectral analysis should be of the input being as long as possible. In this case it increases the sequential resolution as well. However, with low correlations between neighboring data, the input data should be divided into blocks as long as the sequential resolution is allowed. Obviously, the analysed results of each block should be averaged with an appropriate filtering.
吳栗權,車京玉,朴鍾南 明知大學校 産業技術硏究所 1996 産業技術硏究所論文集 Vol.15 No.-
The ignition system of any sparked-ignited internal combustion engine-powered device is well recognized as a major source of radiated electromagnetic interference(EMI). Measurements of the electromagnetic noise radiated by automotive ignition systems were made at 150㎑ - 1㎓. With the widespread use of various electrical applicances in daily life, there has been an increase in unnecessary radiated electromagnetic waves influencing many spheres of social life. In addition to the radiation of unnecessary electromagnetic waves by electrical machinery, considerable noise arises from ignition systems of internal combustion engine. Automotive ignition noise is due to fast rise-time(impulsive) currents that flow in the vehicle's wiring. The three major sources of impulses are the breakdown in the distributor of the gap between the rotor and the posts, the breakdown of the spark plug gap, and the closure of the breaker points. Each of these sources can be threated individually to suppress the ignition noise.