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박종락,이호상 한국금형공학회 2019 한국금형공학회지 Vol.13 No.1
Analytical and experimental study were carried out in order to achieve simultaneous coating and injection molding of an automotive armrest. A mold was designed to be included one core and two cavities, which were composed of a substrate cavity and a coating cavity. The materials used were PC/ABS for substrate and 2-component Polyurethane for coating. The predicted flow patterns were in good agreement with experimental results in injection molding and in-mold coating. Based on analysis and experiment, it was found that the optimal processing conditions were packing pressure of 90MPa and holding time of 7sec.
The High Reflectance of Metallo-Dielectric One-Dimensional Photonic Band-Gap Structures
박종락,박시현,김현수,김진태,이준기 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.48 No.6
We present a new design for multilayer reflectors and investigate metallo-dielectric onedimensional photonic band-gap structures. Our metallo-dielectric reflector is constructed by stacking consecutive layers of a high-index dielectric material, a low-index dielectric material, and a metal (HLM structure). Optimizing the thicknesses of the layers with a periodic HLM structure produces high reflectance, while using very few layers composed of approximately four skin depths of the metal. Alternatively, optimizing the thicknesses of the layers with a non-periodic HLM structure results in a mirror with an even higher reflective.
Analysis of a Laser Direct Writer with an Acousto-optic Modulator Employed for Dose Gray-scaling
박종락,Youngsik Kim,Tom D. Milster 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.51
We have studied a laser direct writing system for the fabrication of gray-scale diffractive optic elements in terms of its system characteristic curve that can be understood as a composite function of a characteristic curve for an acousto-optic modulator employed for dose gray-scaling and that for a photoresist used for continuous profile formation. A mathematical analysis method was developed and applied to retrieve the two constituent characteristic curves for the acousto-optic modulator and the photoresist from the system characteristic curves. The validity of the results was confirmed through comparison with direct measurements.
레이저 직접 묘화 시스템의 에어리얼 이미지에 관한 연구
박종락,범태원,김영식,Tom D. Milster,박승태,권해혁 조선대학교 공학기술연구원 2022 공학기술논문지 Vol.15 No.4
We studied the aerial image of an laser direct writing system. An analytical expression for the pixel image was introduced and a concise formula for the aerial image of the system was presented. Simulations of a sawtooth pattern having various period values were performed. The aerial image contrast was obtained as a function of the sawtooth pattern period. It was found that the shorter the period, the worse the aerial image contrast. For sawtooth pattern periods larger than 84.0 ㎛ (40-pixel), the image contrast was greater than 0.9, while for sawtooth pattern periods smaller than 10.5 ㎛ (5-pixel), the image contrast was lower than 0.5
식품 산업에서의 근적외선 분광법을 이용한 비파괴 분석법 동향
박종락 한국식품과학회 2022 식품과학과 산업 Vol.55 No.1
Near-infrared spectroscopy (NIRS) is one of the representative non-destructive and eco-friendly analysis methods used for rapid analysis of various ingredients in the food industry. To develop analysis model with NIRS, Chemometrics are applied after pre-treatment of spectrum. Many studies have been reviewed on the analysis of general and functional components for agricultural and livestock products. In the case of livestock products, some studies have been conducted for on-line analysis. This study investigated results on various samples and component applying near-infrared spectroscopy. Furthermore, the results according to sample condition were compared. It was confirmed that NIRS is applied to various fields in the food industry.
박종락 한국의사결정학회 2002 경영과학연구 Vol.11 No.-
Nowadays, the complexity and dynamics of organizations, and the growth in networked information resources require automated negotiation to support flexible and fast online negotiation. Many researchers have studies automation, which mainly used to solve conflicts in distribution of tasks and resources between agents in multi-system. There are many methods to support automated negotiations. But, it's very complex and has many hypotheses which are not easy to satisfied in practice. So we may adopt adding argument method which has five type of attribute. Aim of the paper is to describe through a simple example a general methodology for adding arguments to explain flexible and fast online negotiation.