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박준식,최진화,조명우,최길운,Park, Joon-Sik,Choi, Jin Hwa,Cho, Myeong-Woo,Choi, Gil-Woon 한국기계가공학회 2004 한국기계가공학회지 Vol.3 No.1
In this paper, mechanical behaviors of developed pedicle screw system, made of bio-mechanical materials(Ti-6Al-4V, Grade 5), ale predicted using FEM analysis. As a first step, morphologic construction of normal Korean spines and surgical operation convenience are considered to design optimum pedicle screw system. In this step, various design variables are considered as design parameters to develop optimized models. As a next step, tension and bending tests are performed to improve the structural performance of the developed system using finite element method. In this step, required Static compression and bending test specifications by ASTM F-04 25 04 01 are applied to understand the bio-mechanical behaviors of the designed spinal implant system under various load types. As the results of this research, it is possible to develop efficient pedicle screw system, having enough rigidity and fixation to stand any spinal damage under allowable stress conditions.
박준식,서태일,배종석,윤길상,Park, Joon-Sik,Seo, Tae-Il,Bae, Jong-Suk,Yoon, Gil-Sang 한국생산제조학회 2006 한국생산제조학회지 Vol.15 No.3
Existing orthopedic implants such as pedicle screw and spinal cage were designed to fix the spinal structure. But, nowadays, physicians want to rehabilitate there original functions. To achieve this request, we studied micro-movable structure for interspinous. As a first step, we designed interspinous structure by 3D CAD to join each spinous processes. Next, we simulate it with various factors such as the thickness of micro-movement structure and the design of clip. At last, we performed static compressive test to satisfy the failure load of 339N and dynamic endurance test of 1.2M cycle. As a result, we developed interspinous implant and did several surgery to evaluated its satisfaction.
3wt% Si 첨가강의 레이저용접부 성형성에 미치는 용접변수의 영향
박준식,우인수,이종봉,Park, Joon-Sik,Woo, In-Su,Lee, Jong-Bong 대한용접접합학회 2006 대한용접·접합학회지 Vol.24 No.4
The aim of present study is to investigate the effect of welding parameters and heat treatment conditions on the formability of the $CO_2$ laser welded silicon steel sheet. It was found that there is optimum range of the heat input ($0.6{\sim}0.7kJ/cm$) and gap distance ($0.125{\sim}0.150mm$) for the high tensile strength and the avoidance of the fracture in weld metal. Also, it was essential fur the improvement of formability to perform pre- and post-welding heat treatment which cause the uniform mixture of base metal and welding consumable.
박준식,정보영,안규백,이종봉,Park, Joon-Sik,Jung, Bo-Young,An, Gyu-Baek,Lee, Jong-Bong 대한용접접합학회 2007 대한용접·접합학회지 Vol.25 No.4
선박의 고강도화 및 극후물화가 진행됨에 따라 선체 구조물의 파괴 특성에 대한 관심이 높아지고 있으며, 최근 균열정지의 관점에서 취성균열 정지특성에 대한 연구가 활발히 이루어지고 있다. 기존의 연구결과에 따르면 65mmt 이상의 극후물 용접부에 대해서 취성균열 정지특성의 저하가 발생할 가능이 있다고 보고되고 있으며, 취성균열 정지특성이 우수한 강재의 개발 이외에 용접부 보강재의 부착, 보수 용접 실시 등 개선 방안을 마련하기 위한 다양한 연구가 진행되고 있다. 그러나 극후물 용접부 취성균열 전파기구에 관한 규명은 현재 전무한 실정이며, 강재 두께의 영향 이외에 용접 입열량 용접부 잔류응력 등의 효과가 복합적으로 검토되어야 한다. 아울러 극후물 용접부 균열정지 파괴인성의 평가, 대형파괴시험을 대체할 소형시험법의 개발 및 검증 등에 관한 연구가 요구된다.
대학 입학예정자를 위한 기초수학 특강의 학업성취도 분석
박준식,표용수,Park, Joon-Sik,Pyo, Yong-Soo 영남수학회 2013 East Asian mathematical journal Vol.29 No.4
The purpose of the study is to find out how to improve the ability of problem-solving for matriculants who have deficiency in understanding general mathematics. To figure out effective teaching method for the matriculants, we manage special lecture for basic mathematics and, analyze student assessment, course evaluation and also effects on calculus subject.
박준식 ( Joon Sik Park ),표용수 ( Yong Soo Pyo ) 한국수학교육학회 2013 수학교육논문집 Vol.27 No.1
P대학에서는 수학 기초학력 부진학생들의 문제해결력 향상과 학업성취도 고양을 위하여, 기초수학및연습 교과목을 개설하고 있다. 이 교과목은 미적분 학의 선수과목으로 운영되며, 수준별 학급을 편성하여 다양한 학습 자료를 활용한 발표 중심의 수업을 진행하고 있다. 본 논문에서는 한국공학인증 지원을 위해 기초수학및연습 교과목의 강의 포트폴리오를 제출한 30개 학급에서 수강한 1,106명의 취득 성적과 및 강의평가 결과를 분석하였다. 아울러, 각 담당교수가 제출한 강의 포트폴리오의 강의개선보고서를 기반으로 기초수학및연습 교과목의 수준별 학급 운영에 대한 유의점과 그 개선방안을 찾아본다. In order to improve the problem-solving abilities and enhance the academic achievement of under achieving students for university basic mathematics, P-university has opened the basic mathematics and practice education courses. These education courses are operated as prerequisite subject of Calculus and we are progressing the class focused on presentation with variety learning materials by organizing level-based classes In this paper, we analyzed the acquired grade and the result of teaching assessment of 1,106 students registered in the 30 classes that the teaching portfolio of the basic mathematics and practice education courses were submitted to support ``Accreditation for Engineering Education of Korea``. In addition, we tried to find attention points and improved solutions on operating the level-based class of the basic mathematics and practice education courses based on the ``Continuous Quality Improvement Report`` of teaching portfolio submitted by each professor who is in charge of this class.