자동차용 피스톤 핀의 전·후방압출에서 유동제어에 관한 시리험적 연구

박종남,박태준,김동환,김병민 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.7

드럼세탁기용 커플링 부품 다이캐스팅 금형개발

박종남,노승희,이동길 한국산학기술학회 2020 한국산학기술학회논문지 Vol.21 No.6

This study conducted a prototype development and evaluation by performing die-casting mold design, mold manufacturing, and injection condition optimization based on flow and solidification analysis to meet the needs of the coupling parts produced by die casting. Through flow analysis, the injection conditions suitable for 100% filling in the cavity were found to be a molten metal temperature of 670 ℃, injection speed of 1.164 m/s, and filling pressure of 6.324~18.77 MPa. In addition, solidification close to 100 % occurred in all four cavities when the solidification rate was 69.47 %. A defect inspection on the surface and inside the product revealed defects, such as poor molding and pores. In addition, the dimensions of the injected product were within the target tolerance and showed good results. Through the feedback of the results of flow and solidification analysis, it was possible to optimize the mold design, and the injection optimization conditions were confirmed to be a total cycle time of approximately 6.5 seconds. Good quality carrier parts with an average surface hardness of approximately 45 mm from the gate measured at 97.48(Hv) could be produced. 본 연구의 목적은 소비자 및 현장의 니즈에 부합하면서 다이캐스팅으로 생산할 수 있는 커플링 부품을 개발하고자 하였으며, 유동 및 응고해석을 기반으로 다이캐스팅 금형 설계, 제작, 및 사출조건 최적화 도출을 실시하였고 사출된 제품의 측정 및 평가를 수행하였다. 유동해석을 통하여 캐비티 내부가 100% 충진되기 위한 적정한 사출조건은 용탕의 온도 670℃, 사출속도 1.164m/s, 충진압력 6.324~18.77MPa로 분석되었다. 또한, 응고율이 69.47%일 때 4개의 캐비티 모두에서 100%에 근접하는 응고가 발생됨을 알 수 있었으며, 이를 기초로 시사출 조건설정 등에 응용하였으며 그 결과 사이클 타임은 약 6.5초로 도출되었다. 다이캐스팅으로 시사출된 제품의 표면 및 내부의 품질 검사를 수행한 결과 성형불량 및 기공 등의 결함은 전혀 발견되지 않았으며, 주요 개소의 치수를 측정한 결과 모든 항목에서 허용하는 공차 이내의 값을 보였다. 또한, 게이트로부터 약 45mm 이격된 곳의 평균 경도값은 97.7(Hv)로 나타나는 등 전체적으로 양호한 치수 및 품질의 부품을 제작할 수 있었다.

1LF-8 Synthesis of quantum dots and their optoelectronic application through surface engineering

박종남 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.0

Quantum dots (QDs) have attracted considerable attention as promising materials for use in various optoelectronic devices due to their excellent properties, such as band gap tuning across the full colour spectrum and high quantum efficiency. In particular, monodisperse and highly crystalline QDs have been widely pursued as prospective active materials for next-generation displays as well as a promising class of solar cell manufactured at low cost. Here, recent advances in the understanding of QD to develop the new synthetic methodology for QDs and their application to optoelectronic devices will be presented including fundamental concepts of QDs.

Effects of High Concentration CO2 Treatment on the Blackening and Quality Changes of Cut Cabbage

박종남,정천순,Ki Wung Kwak,Jang Hyun Kyong,Sang Jun Park,Seok Hyun Eom 한국원예학회 2007 Horticulture, Environment, and Biotechnology Vol.48 No.6

This study was carried out to investigate the effects of high concentration CO2 treatment on the blackening and quality changes of cut cabbage. Cut cabbages were exposed to air (control), 30, 60, and 90% CO2, for 9 h at 13℃, and then stored for 3 days at room temperature (27±4℃). PPO activity was lower in the cut cabbages treated with CO2 than in the control. Total phenolics concentration decreased slowly in the cut cabbages as PPO activity was inhibited by CO2. Fastened blackening occurred in the control during storage, and there was positive relationship between blackening index and PPO activity. Higher respiration rates and ethylene production induced by high CO2 treatment were rapidly restored to the initial levels as storage period was extended. In contrast, production of ethylene increased constantly up to the second day of storage in the control with decay. At the end of storage, total sugar concentrations were lowest in 90% CO2, while weight loss and ascorbic acid contents were not significantly different among the treatments.

나노입자 기반 에너지 소재 및 촉매 연구 동향

박종남 한국화학공학회 2017 NICE Vol.35 No.5

랜덤신호의 Walsh 파워 스퍽트럼 특성연구

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.

乘用車 點火시스템의 電磁波 干涉 特性에 關한 硏究

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.

전기 비저항법을 이용한 철근부식 거동에 대한 연구

한정섭,이상호,박종남 東亞大學校 海洋資源硏究所 1996 硏究論文集 Vol.9 No.1

To study the behavior of rebar corrosion, a electrical resistivity method was adapted. The Wenner array was used for samples having limited sizes. The vertical sounding to the pseudo-depth shows that the apparent resistivity decreases as a pseudo-depth become deeper and at near the surface of rebar it increases abruptly and then it decreases again. It was confirmed that according to the type and the amount of corrosion products the resistivity values were changed.

초음파 분석장비(UMQA4)를 이용한 파일의 건전도 시험을 위한 모형실험

박종남,이재경,김현건 동아대학교 건설기술연구소 1999 硏究報告 Vol.23 No.2

The ultrasonic logging method is one of the earliest methods of checking the integrity of pile. The main purpose of the paper is to conduct the model test in water to qualify the ultrasonic analyser, UMQA4, in its accuracy and repeatability and to offer basic information for effective analysis with the field data by model testing of the scaled concrete pile, and thus to increase the applicability of the apparatus. The result of experiment shows that the system is stable and excellent in repetition; and relatively easy and rapid in locating any defects in the pile in vertical section, but not in horizontal one, which should be studied further by tomography, etc. Also, further study on model-test should be done for its applicability to classifying near-surface rock mass features.

차량의 파워 트레인과 운전 조건이 차량의 냉각 성능에 미치는 영향

박종남,김재호,차경옥 明知大學校 産業技術硏究所 2003 産業技術硏究所論文集 Vol.22 No.-

Abstract - With the ever increasing demanded on automatic transmission, improve performance, add air conditioning, meet noise and pollution legislation the need to evaluate and improve cooling system performance at the design stage is becoming increasingly important. ATB is the abbreviation for Ait-to-Boil. This is the extrapolated ambient temperature at which the coolant would boil. ATB is the measure of cooling system capability. Coolant temperature control insures durability and long engine life in vehicle users application. A numerical simulation is conducted to compare the various experimental results by the "e-NTU" method. The purpose of this paper is to suggest the matching technique of vehicle cooling system including automatic transmission by means of various experimental results and comparing with simulation results.