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박종남,Park, Jong-Nam 한국금형공학회 2013 한국금형공학회지 Vol.7 No.1
During the cold forming, due to high working pressure acting on the die surface, failure mechanics must be considered before die design. One of the main reasons of die failure in industrial application of metal forming technologies is wear. The mechanisms of wear are consisted of adhesion, abrasion, erosion and so on. Die wear affects the tolerances of formed parts, metal flow, and costs of process. The only way to control these failures is to develop a prediction method on die wear suitable in the design state in order to optimize the process. The wear system is used to analyse 'operating variables' and 'system structure'. In this study, with AISI D2, AISI 1020, AISI 304SS materials, a series of the wear experiments of pin-on-disk type to obtain the wear coefficients from Archard's wear model and the upsetting processes are carried out to observe the wear phenomenon during the cold forming process. The analysis of upsetting processes are performed by the rigid-plastic finite element method. The result of the analysis is used to investigate the die wear the processes, and the analysis simulated die wear profiles are compared with the experimental measured die wear profiles.
박종남,정성택,조규재,Park, Jong-Nam,Jeong, Seong-Taek,Cho, Gyu-Jae 한국기계가공학회 2003 한국기계가공학회지 Vol.2 No.2
Composite materials are widely used to make all kinds of machine parts, internal and structural materials of cars, aerospace industries, building structures, ship materials, sporting goods and others. It is worth the while to use composite materials as various substitutions when compared With others. But the use is limited in the field of the mechanical processing because of its difficulties in cutting. The surface roughness of in and out in the hole processing was discussed after cutting the GFRP with HSS drill in the vertical machining center. And it is observed that as it processed more, the powdered chip may be got more than the fluid type long chip.
선삭가공시 Ti-6Al-4V 합금의 절삭특성에 관한 연구
박종남,조규재,이승철,Park, Jong-Nam,Cho, Gyu-Jae,Lee, Seung-Chul 한국기계가공학회 2004 한국기계가공학회지 Vol.3 No.4
The titanium has many superior characteristics such as specific strength, heat resistance, corrosion resistance, organism compatibility, non-magnetic and etc. and their quantity are abundant. This study performed turning operation of Ti-6Al-4V alloy using the TiAlN coated tool which was treated with PVD. Experimental works were also executed to measure cutting force, chip figuration and surface roughness for different cutting conditions. As a result of study, tool wear was serious at the condition over 100m/min of cutting speed. The excellent cutting condition of cutting depth was at 1.0mm.
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.
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,김재열,조규재,Park, Jong-Nam,Kim, Jae-Yoel,Cho, Gyu-Jae 한국생산제조학회 2010 한국생산제조학회지 Vol.25 No.3
The Titanium has many superior characteristics which are specific strength, heat resistance, corrosion resistance, organism compatibility, non-magnetic and etc. and their quantity are abundant. this study performed turning operation of Ti-6Al-4V alloy using the TiAlN Coated Tool which treated Physical Vapor Deposition. Experimental works are also executed to measure cutting force, tool wear, chip figuration and surface roughness for different cutting conditions. As a result of study. Cutting depth influences on the cutting force much more than the feed rate and the value of the cutting force is the most stable at the depth of 1.0mm. And tool wear was serious at over 100m/min of cutting speed and cutting condition was excellent at 1.0mm of cutting depth.
디젤 하이브리드 전기자동차의 엔진 정지 및 시동 기능의 개발
박종남(Jongnam Park),박진우(Jinwoo Park),박상민(Sangmin Park),임훈섭(Hunseob Lim),김현옥(Hyunok Kim) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Hybrid Electric Vehicle (HEV) has two power sources, one is an internal combustion engine, the other one is an electric motor, and HEV is developed for reducing fuel consumption and emission. The main driving strategy of HEV is start & stop mode and boosting & regeneration mode done by electric motor. Therefore, the effect for fuel consumption by engine start & stop function should be evaluated and optimized in HEV. This paper introduces mild type Diesel HEV and evaluation results of engine start algorithm by electric motor. In addition that, this paper evaluates the contribution of fuel consumption by engine start & stop function based on test results in chassis dynamometer by FTP mode.
박종남(Park, Chongnam),정무권(Chung, Moo-Gwon),전미양(Jun, Miyang) 한국아시아학회 2018 아시아연구 Vol.21 No.2
본 연구는 빈곤문제개발협력연구원(IPAID)의 네팔 Tikapur 지역조사 데이터를 이용하여 사회적 자본과 소득의 관계를 분석하였다. 최근 사회적 자본의 구성 요인에 따라 소득에 미치는 영향이 달라진다는 연구 결과를 바탕으로, 사회적 자본을 결속형 사회 자본과 교량형 사회 자본으로 구분하여 소득과의 관계를 분석하였다. 분석 방법은 사회적 자본과 소득 간의 내생성 문제를 고려하여 도구변수를 활용한 2단계 최소제곱법을 이용하였다. 분석 결과를 요약하면, 결속형 사회 자본은 소득 증대에 긍정적으로 작용하는 것으로 밝혀졌으나, 교량형 사회자본과 소득의 관계는 역-U자형 관계로 나타났다. 지역 발전과 빈곤 감소전략을 추진할 때 결속형 사회 자본을 증진할 수 있는 다양한 프로그램 개발이 요구된다. 아울러 교량형 사회 자본 구축은 개인적인 차원을 넘어 지역 정부, 시민사회, 언론 등의 지원이 뒷받침 되어야 할 것이다. This study analyzed the relationship between social capital and income, asking if social capital, categorized as bonding and bridging, would have a positive impact on income. The study uses a regional survey data produced by the Institute for Poverty Alleviation and International Development(IPAID) and employes two stage least squares(2SLS) method. The results of the analysis suggest that bonding in social capital has a positive effect on income increase, while the relationship between bridge social capital and income shows an inversed-U type relationship. The paper argues that through efforts of local government, civil society, and the media, a further developed programs that promote bonding in social capital would result in regional development and poverty reduction.