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고체추진 로켓모터의 지상연소시험시 발생되는 진동현상에 관한 연구
김준엽,장성조,김도영 대한기계학회 1993 대한기계학회논문집 Vol.17 No.9
Many items, as internal pressure, thrust, temperature, strain, etc. are measured in Ground Firing Test (GFT) of rocket motors. But these items are influenced by various phenomena occurred during propellant combustion. In this study, natural frequencies of motor itself and system(motor+loadcell) on Stand were measured. Also motor responses were measured during burning and analyzed so that the vibration characteristics occurred during GFT and the causes and characteristics of vibration signal appearing on thrust curve were identified.
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(t, n) 임계치 기법을 이용한 센서네트워크에서의 공개키 인증
김준엽,김완주,이수진,Kim, Jun-Yop,Kim, Wan-Ju,Lee, Soo-Jin 한국군사과학기술학회 2008 한국군사과학기술학회지 Vol.11 No.5
Earlier researches on Sensor Networks preferred symmetric key-based authentication schemes in consideration of limitations in network resources. However, recent advancements in cryptographic algorithms and sensor-node manufacturing techniques have opened suggestion to public key-based solutions such as Merkle tree-based schemes. These previous schemes, however, must perform the authentication process one-by-one in hierarchical manner and thus are not fit to be used as primary authentication methods in sensor networks which require mass of multiple authentications at any given time. This paper proposes a new concept of public key-based authentication that can be effectively applied to sensor networks. This scheme is based on exponential distributed data concept, a derivative from Shamir's (t, n) threshold scheme, in which the authentication of neighbouring nodes are done simultaneously while minimising resources of sensor nodes and providing network scalability. The performance advantages of this scheme on memory usage, communication overload and scalability compared to Merkle tree-based authentication are clearly demonstrated using performance analysis.
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Spontaneous Intracerebral Hemorrhage: Management
김준엽,배희준 대한뇌졸중학회 2017 Journal of stroke Vol.19 No.1
Spontaneous non-traumatic intracerebral hemorrhage (ICH) remains a significant cause of mortality and morbidity throughout the world. To improve the devastating course of ICH, various clinical trials for medical and surgical interventions have been conducted in the last 10 years. Recent large-scale clinical trials have reported that early intensive blood pressure reduction can be a safe and feasible strategy for ICH, and have suggested a safe target range for systolic blood pressure. While new medical therapies associated with warfarin and non-vitamin K antagonist oral anticoagulants have been developed to treat ICH, recent trials have not been able to demonstrate the overall beneficial effects of surgical intervention on mortality and functional outcomes. However, some patients with ICH may benefit from surgical management in specific clinical contexts and/or at specific times. Furthermore, clinical trials for minimally invasive surgical evacuation methods are ongoing and may provide positive evidence. Upon understanding the current guidelines for the management of ICH, clinicians can administer appropriate treatment and attempt to improve the clinical outcome of ICH. The purpose of this review is to help in the decision-making of the medical and surgical management of ICH.
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학업 성취변화에 기초한 학교 내 성취 격차 유형분류 및 영향 요인 탐색
김준엽,박인용,시기자 한국교육평가학회 2014 교육평가연구 Vol.27 No.5
이 연구는 고등학교 입학당시 성취수준에 따라 차별적으로 학업성취 변화에 영향을 미치는 변인과 학업성취 변화 유형에 따른 학교 특성 및 성취변화 유형 결정 요인에 대해 탐색하였다. 연구 결과 첫째, 자기주도학습 시간, 수업태도, 교과태도는 학업성취 향상에 긍정적인 효과를 보였으며, 교사와 학생 및 학부모의 학업에 대한 열의가 높은 학교에서 학업성취가 향상되는 효과가 있었다. 둘째, 자기주도학습 시간이 과외시간에 비해 학업성취 향상에 보다 긍정적인 효과를 주는 것으로 나타났다. 특히 국어, 수학, 영어 교과 순으로 과외시간보다 자기주도학습 시간의 효과크기가 크게 나타나 영어 공교육 강화의 필요성을 확인하였다. 셋째, 자율형 공립 학교는 일반 공립 학교에 비해 학업성취가 중위수준 이상인 학생의 성취 향상에 효과적으로 나타나 자율형 공립 학교에서 학습부진 학생을 위한 보정교육이 보다 강화될 필요가 있음을 확인하였다. 넷째, 학교 규모는 하위 성취수준 학생의 성취 향상에 부정적인 효과를 나타냈다. 다섯째, 전체 학업성취 수준에서 모두 향상한 '전체 성취 향상 학교'를 구분하는 주요 변인은 자기주도학습 시간인 반면, 상위수준 학생의 성취가 향상한 '상위 성취 향상 학교'를 구분하는 주요 변인은 과외시간이었다. The study investigated the differential effects of variables on academic achievement, the school characteristics, and the determinants of school types. The results are as follows. First, self-directed learning time, class attitude, subject attitude had positive effect on academic achievement and in schools with high academic climate academic achievement improved. Second, self-directed learning time had more positive effect on the improvement of the academic achievement rather than extracurricular learning. Particularly, the effect of self-directed learning in English were lower than that in Korean and mathematics, and thus, we need to strengthen English public education. Third, the results suggest that we need to strength education for the under achievement students in autonomous public schools. Fourth, the results suggest that we need to concern about the under achievement students in the big schools. Fifth, the results suggest that we need a program to enhance student ability of self-directed learning and also, we need to improve the quality of alternatives to private education for high achievement students.
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김준엽,이시복,Kim, Joon-Yeop,Lee, Si-Bok 한국음향학회 1989 韓國音響學會誌 Vol.8 No.1
탄성 평판에 왕복압축기를 설치할때의 최적마운트 설계문제를 다루었다. 마운트 부재로 네 개의 짧은 중공 고무원통(hollow rubber cylinder)을 사용하여 설계변수로서 고무원통의 두께, 지름, 높이, 그리고 설치위치를 고려한다. 최소 힘 전달율을 주는 최적마운트 매개변수 결정에는 구속 로젠브록법을 이용한다. The optimal mounting system for reciprocating comperssor supported on a flexible is designed. Four short hollow rubber cylinders are used as mounting pads, and so the thickness, diameter, height and location of the rubber mounts are considered as design parameters. The optimal mounts parameters which give the smallest force transmittance, are obtained by Constrained Rosenbrock Method.
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