무인 항공기 탑재 카메라 제어 및 영상처리

김광진,안용남,송용규,Kim, Kwang-Jin,Ahn, Yong-Nam,Song, Yong-Kyu 항공우주시스템공학회 2009 항공우주시스템공학회지 Vol.3 No.4

This paper is about EO sensor module control based on the image processing. The main purpose of this research is acquiring a latitude and longitude of the target located on the ground by using image processing. For image processing, OpenCV is employed which is a computer vision library originally developed by Intel, and ATmega128 is used for the EO sensor module control. This task also involves realization of control programs and acquisition of sensor view angle for the position of the target.

강재의 고주기 피로시험 최적화를 위한 알고리즘 및 소프트웨어 개발

김광진,김대용,Kim, Kwang Jin,Kim, Dae Yong 한국강구조학회 2018 韓國鋼構造學會 論文集 Vol.30 No.3

강구조물은 일반적으로 설계 단계뿐만 아니라 유지관리 단 계에서도 피로 검토를 한다. 이러한 피로 검토를 위해서는 S-N 곡선을 이용하므로 구조물의 보다 정확한 피로 평가를 위해서는 소재의 S-N 관계 평가가 잘 이루어져야 한다. 금속재료의 피로시험을 위한 규격이 국내 외에 마련되어 있으나, 다량의 시편을 이용하여 수행되는 일련의 피로시험에서 어느 정도의 응력 수준으로 시험해야할지 결정하는 것은 시험자의 판단에만 의존한다. 본 연구는 금속재료의 피로시험을 일관된 절차에 따라 진행할 수 있도록 알고리즘을 개발하였다. 연구의 목적 달성을 위해 기존 문헌을 조사하여 피로강도 예측 방법에 대해 검토하고, 이 예측 방법을 이용하여 실제 피로시험 전 S-N 곡선을 추정하여 시험하중을 선정하도록 절차을 개발하고 소프트웨어로 구현하였다. 마지막으로 실증시험을 수행하여 소프트웨어의 유용성을 확인하였다. Fatigue tests are conducted for design and(or) maintenance. For fatigue strength evaluation, accurate S-N relationship is firstly determined for metallic materials used. However, many researchers are facing difficulties in deciding a series of test loads, stress level number, stress range intervals, etc. In this study, the rational algorithm and software to conduct fatigue tests was developed. For achieving this purpose, a diversity of methods of fatigue strength estimation were studied. The fatigue software automatically presents real fatigue test results. Finally, practical use of this algorithm and software was proved through verification test.

COD(Crack Opening Displacement) 측정을 통한 강재의 피로균열진전속도 추정에 관한 실험적 연구

김광진,김인태,류용열,Kim, Kwang-Jin,Kim, In-Tae,Ryu, Yong-Yeol 한국강구조학회 2010 韓國鋼構造學會 論文集 Vol.22 No.6

강구조물의 점검시 피로균열이 발견되는 경우에는 보수 보강 시행의 결정과 구조물의 점검주기 결정을 위한 균열의 현재 상태평가와 앞으로의 균열진행 정도에 대한 정량적인 예측이 요구된다. 피로균열에 대한 손상도 평가는 파괴역학 파라미터를 이용한 균열진전속도와 취성파단의 여부 결정이 대표적인 방법으로 파괴역학에 관한 전문적인 지식과 함께 수치해석 프로그램의 활용능력이 필요하다. 이에, 본 연구에서는 피로손상도 평가 방법에 관한 다양성을 확보하고, 파괴역학에 대한 전문적인 지식이 없는 기술자가 피로균열에 의한 강구조물의 손상도를 간편하게 평가 할 수 있는 방법을 개발하기 위한 첫 단계로, 관통균열 시험편을 이용한 균열진전시험을 실시하였다. 그리고 피로균열 표면으로부터 측정된 COD(Crack Opening Displacement)의 크기와 측정위치를 이용하여, 균열진전속도를 추정하기 위한 파라미터를 도출하고, 그 타당성을 분석하였다. 그리고 관통균열이 있는 시험편의 형상, 응력범위, 그리고 응력비에 상관없이 COD를 이용하여 피로균열진전속도를 추정할 수 있는 방법을 제시하였다. Steel structures have a higher probability of being damaged by fatigue than by other causes of deterioration. As such, their maintenance to prevent fatigue damage is essential to sustain their safety and performance during their service period. In their maintenance, the current state of their fatigue cracks must be assessed to determine appropriate reinforcement methods and the suitable time intervals of periodic inspections when fatigue cracks are detected. Determining the crack growth rate is a successful method of predicting fractures, but it requires technical knowledge on fracture mechanics and experience in numerical methods and software for finite element analysis. In this study, a fatigue crack growth test on through-thickness cracked steel plates was conducted to assess the crack growth rate without superior technical knowledge and experience. The relationship between the Crack Opening Displacement (COD) and the crack growth rate was found in relatively long fatigue cracks.

쉴드터널 시공 시 막장안정을 위한 지보압의 이론적.수치해석적 고찰

김광진,고성일,추석연,김종수,Kim, Kwang-Jin,Koh, Sung-Yil,Choo, Seuk-Yeun,Kim, Jong-Soo 한국터널지하공간학회 2006 한국터널지하공간학회논문집 Vol.8 No.3

대단면 쉴드 TBM을 이용한 터널굴착공법은 여러 기계화 시공법과 함께 향후 터널 연장의 장대화 추세에 부합하여 국내 활용도가 더욱 높아질 것으로 예상되는 터널 굴착공법이다. 특히 쉴드공법은 지반조건이 열악한 얕은 심도의 터널에 적용성이 우수한 공법으로 인식되고 있으나, 부적절한 장비선정, 터널 시공중 장비결함, 예상치 못한 지반조건 조우 등의 문제로 인하여 시공 중 사고 트러블 사례가 종종 발생되고 있다. 특히 터널막장에서의 트러블 발생 빈도가 매우 높아, 안정적이고 효율적인 굴착을 위해서는 굴착중 막장압 관리가 매우 중요하다. 따라서 본 연구에서는 터널막장의 안정화를 위한 이론적 막장지보압 산정방법의 고찰과 수치해석적 방법에 의한 지보압에 따른 지반거동 양상을 비교 분석 하였다. A large sectional tunnelling method using Shield TBM is expected to be popular as domestic demand of long tunnel gets growing. Although a shield tunnelling method has been recognized as prominent method in consideration of stability and applicability in shallow and poor ground, the cases of accident and constructional trouble have been often happened due to unexpected poor ground condition, or selection and use of improper shield machine. Especially, troubling cases at tunnel face are frequently occurred, so supporting pressure control of tunnel face would be the main issue for securing safer and more efficient tunnel excavation using Shield TBM. In this point, we carried out the numerical feed-back analysis to compare the ground deformation pattern with theoretical result at tunnel face.

이동 로봇 장애물 회피 방법의 수치적 성능 분석

김광진,고낙용,Kim, Kwang-Jin,Ko, Nak-Yong 한국전자통신학회 2012 한국전자통신학회 논문지 Vol.7 No.2

본 논문에서는 대표적인 이동 로봇의 장애물 회피 방법들의 성능을 분석한다. 이를 위해 장애물 회피 성능 지수로서 목표점까지 이동한 거리, 이동 시간, 장애물과의 거리, 로봇 동작의 평활도(smoothness)를 제시한다. 특히 로봇 동작의 평활도는 로봇 동작 시 조향 방향의 각가속도와 저크(jerk)를 사용하여 로봇의 실질적 이동 효율성을 측정하는 성능 지수이다. 주어진 성능 지수에 의하여 4가지의 주요한 장애물 회피 방법을 비교하였다. 주요한 장애물 회피 방법은 인공 전위계 방법, 탄성력(elastic force) 방법, 가상 거리(virtual distance)에 의한 인공전위계 방법, 그리고 가상 거리에 의한 탄성력 방법이다. 시뮬레이션을 통하여 각 방법의 성능을 비교 분석하여 각각의 장애물 회피 특성을 파악하였다. This paper analyzes performance of major obstacle avoidance methods. For the analysis, numerical performance indexes are proposed: motion distance to goal point, motion time, distance to obstacles, and smoothness of the motion. Especially, the index of smoothness measures efficiency of the motion using the angular acceleration and jerk of the robot heading. Four major obstacle avoidance methods are compared in terms of the performance indexes. The four methods are artificial potential field(APF) method, elastic force(EF) method, APF with virtual distance, and EF with virtual distance. Through simulation, the four methods are compared and features of the methods are explored.

시뮬레이션을 이용한 이동 로봇의 충돌회피 알고리즘 비교

김광진,고낙용,박세승,Kim, Kwang-Jin,Ko, Nak-Yong,Park, Se-Seung 한국전자통신학회 2012 한국전자통신학회 논문지 Vol.7 No.1

본 논문에서는 이동 로봇이 자율주행을 하기 위해 사용되는 충돌회피 알고리즘을 실제 로봇과 똑같은 환경에 적용된 시뮬레이터를 통해 성능을 알아본다. 이동 로봇의 충돌회피를 위해 기존에 인공전위계 알고리즘과 Elastic force 알고리즘 등이 제안되어져있다. 본 연구에서는 시뮬레이션을 통해 이 두 가지 방법에 의한 동작시간과 경로의 이동 길이를 비교하였다. 시뮬레이터는 IPC(Inter Process Communication)를 기반으로 개발되어졌으며, 알고리즘의 비교에는 차륜형 이동 로봇을 사용하였다. This paper compares two collision avoidance algorithms using a simulator. The collision avoidance is vital for autonomous navigation of a mobile robot. Artificial potential field method and elastic force method are major approaches for the collision avoidance. The two algorithms are compared in the respect of the time for motion completion and the length of the motion path. The simulator is developed based on IPC(Inter Process Communication) and a differential drive mobile robot is used for the comparison.

난소 절제 흰쥐의 골대사에 미치는 골쇄보(骨碎補)의 영향

김광진,정지천,Kim, Kwang-Jin,Jeong, Ji-Cheon 대한한방내과학회 2001 大韓韓方內科學會誌 Vol.22 No.2

Objectives : This study was undertaken to study the action mechanism of Rhizoma Davalliae (RD) at parameter related to regulating bone density. Methods : We measured alkaline phosphatase activity and the contents : calcium, hydroxyproline, osteocalcin, calcitonin, and parathyroid hormone after the ovariectomized rats had been treated with RD for 30 days. Results : The following changes occurred: First, the serum calcium content and the calcitonin content, which decreased in ovariectomized rats, increased with RD treatment. Second, the serum alkaline phosphatase activity, the parathyroid hormone ativity, the osteocalcin content, the urinary calcium content, and the hydroxyprolin content-which increased in ovariectomized rats-decreased with RD treatment. Conclusions : These results show that RD treatment can recover abnormal calcium metabolic process by sex hormone inequality, promoting bone formation and inhibiting bone absorption.

북한경제의 달러화와 김정일 '궁정경제'

김광진 ( Kwang Jin Kim ) 연세대학교 북한연구원 2007 통일연구 Vol.11 No.2

Dollarization and dependence on hard currency for Kim Jong Il, north korean economy and the people is more than serious now. The world already experienced Kim Jong Il`s ``pertinacity`` to getting back frozen 25million dollars at BDA, Macau., even not hesitating to show up with failed atomic bomb test. With a new government in South Korea, the south-north relationship is passing through temporary adjustment period and hundreds of thousands of food aid is stopped for a few months, but the rumor is at rampant that a massive starvation is about to break out in North Korea. This is only a case showing North Korea`s dependence on outside. It makes quite anxious to know how the present economic situation and rehabilitation ability is for them and why they can not survive even several months without outside help. For correct diagnosis of this, it`s needed to look into economic structure, foreign dependence and serious dollarization. The main focus of discussion here is on dollarization. There are 2 kinds in dollarization of economy; one is by government`s active involvement through foreign exchange, monetary and foreign economic policy and the other is natural process by market itself as a result of economic downfall, steep devaluation of national currency, increased outside dependence and expanding black market economy. The situation in Peru in mid 90`s is for former case. As for North Korea, it was propelled by ``Royal Court Economy`` which was set up and expanded by Kim Jong Il and this case is not exactly by government policy. The devastated people`s economy run by cabinet, its increased outside dependence, deepening reliance of formal economy and citizens on market by its expansion, rapidly growing 2nd economy and steep fall of ``WON`` is another reason. Kim Jong Il himself and market affected both in a mixed way. Independence of munitions industry in 1972 from cabinet by setting up ``Committee of Economy No. 2`` and growing up economic sector at party with a start of ``Bureau 39`` in 1974 formed up ``Royal Court Economy`` which is military-industrial complex. It became the direct source of Kim Jong Il`s ruling finance and began to serve solely for munitions industry and system`s safeguard. Structured mainly for foreign trade and hard currency earning, it has eaten out people`s economy, becoming a group or conglomerate and now occupy 40-60% of the total national economy. Its expansion and running by Dollar kicked up more serious dollarization of economy. Now almost all the nation`s hard currency income is made and overtaken by this economic sector. Its current asset is 248 times more than people`s economy. This is the main obstacle to rehabilitation of people`s economy. The economic sector run by cabinet extracted to 45% scale in late 90`s, the peak of hardship, as compared with the level of late 80`s when steep fall began. This brought increased outside dependence, growing market and exploding 2nd economy. For survival, citizens were forced into the market rather than relying on state distribution. At the same time, value of ``WON`` fell 20 times for 5-6 years since it was devalued to market level in 2002 which was called ``7.1 measure.`` All these accelerated objection of national currency, increased possession of dollar and black market transactions which makes dollarization extreme. Now it is not too much to say that north korean economy is ``dollar economy,`` or ``hard currency economy``. Inflow of outside assistance and dollar at present economic structure means direct inflow into Royal Court Economy,`` the military-industrial complex. The rehabilitation of north korean economy is only possible when people`s economy, the key industries revive. At the moment, the monopoly of hard currency by ``Royal Court Economy`` and its priority in resource distribution blocks this way. This is the main reason why North Korea can not stand on itself even though a vast amount of aid was input into the state for past 10 years. Of course, food, fertilizer and heavy oil aid for consuming purpose might be another reason but this is only an excuse. Some say that on a condition one can not change the present system from outside, it can be a pretty smart way to make use of ``Royal Court Economy`` sector as motivating force in changing North Korea by letting them taste market economy, which has freer access to outside world. It is sure that the employees in this sector has better ability and skill, and in future they will play the major role in leading change, for they have more frequent contact with outside, better information and understanding of market mechanism. This imposes us another difficult task of choosing how to look at ``Royal Court Economy`` and how to handle them.

조기 개화성의 스프레이 카네이션 ‘페이보우’ 육성

김광진(Kwang Jin Kim),정향영(Hyang Young Joung),최성렬(Seong Roul Choi),신학기(Hak Ki Shin),김형득(Hyoung Deug Kim) 한국원예학회 2002 한국원예학회 학술발표요지 Vol.2002 No.3

톨루엔 처리에 따른 실내식물 화분 토양 내에 미생물 분포 구명

김광진(Kwang Jin Kim),김현주(Hyeon Ju Kim),유은하(Eun Ha Yoo),정현환(Hyun Hwan Jung),장혜숙(Hye Sook Jang),김형주(Hyung Joo Kim),최용근(Yong-Keun Choi),송학진(Hak-Jin Song) 한국원예학회 2015 한국원예학회 학술발표요지 Vol.2015 No.10