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대학생 집단의 학습기술·학습동기·학업적응도와 학업성취와의 관계
김기정 서원대학교 2004 敎育發展 Vol.23 No.1
The study skills, learning motivation. academic adjustments are the significant factors that positively influence the learning process of school learners. In this study, the study skills were measured by 7sub-skills of self-managements, listening and participating in class, task-solving, effectively reading, report writing, information processing, and test-taking Learning motivation were composed of academic self-efficacy and academic failure tolerance And academic adjustments were composed of single scale with 20 items. The purpose of this study were to examine relationships between these process variables and learning outcomes, to explore the relative importance and combined effects of these process variables(10 factors) to academic achievements, and to find the differences in the process variables by sex and academic achievements levels. For this study, 100 male students and 229 female students were purposively sampled in S University. Their GPA were also obtained from their instructors. The major findings in this study were as followings. First, the study skills, learning motivation, and academic adjustments were closely interrelated with the correlation of .53 - .72. The combined effects of study skills and learning motivation to academic-adjustments were 61 percent. Among the variance, the test-taking skill had 57 percent, and self-efficacy skill, task-solving skill, and effectively reading skill had 11 percent, 2 percent, and 1 percent respectively. Second, lower achiever showed more negative behavior and attitudes than normal and higher achiever in 9 factors of the learning process variables. Among these factors. task-solving skill were found to be most important factor through regression analysis. This factor explained 15 percent of variance of academic achievements. Third, the level that college students have utilized study skills in their school learning were 2.8 and the level of learning motivation were 2.5 on 4-point scale. The skill that the students used most frequently were task-solving(3.1 point). Female students showed more positive behavior than male students in the use of study skills. In learning motivation, male showed more positive attitudes. But there were no significant differences by sex in academic adjustment.
저상굴절버스의 전 차륜 조향 시스템 ECU 개발에 대한 연구
김기정,이수호,정기현,최경희,박태원,문경호,Kim, Ki-Jeong,Lee, Soo-Ho,Chung, Ki-Hyun,Choi, Kyung-Hee,Park, Tae-Won,Moon, Kyeong-Ho 한국정보처리학회 2010 정보처리학회논문지 A Vol.17 No.1
삶의 질이 높아지고 고령화 사회가 시작되면서, 사회적 약자들이 사용하기 쉬운 교통수단의 개발의 필요성이 증대되고 있다. 이러한 요구에 부응하기 위해, 한국철도기술연구원에서 주관하여 저상굴절버스(Bi-modal Tram)의 개발을 시작하게 되었다. 이 저상굴절버스는 버스와 같은 높은 접근성의 특징을 가져야 할 뿐만 아니라, 지하철과 같이 차체가 낮아야 하며, 휠체어나 승객의 발이 승강장과 차량 사이 틈에 끼지 않도록 정확한 주차가 이루어져야 한다. 하지만 저상굴절차량의 길이가 길어, 이러한 요건을 맞추기 위해서는 전 차륜 조향 시스템이 개발-장착되어야 한다. 전 차륜 조향 시스템이 장착된 저상굴절차량은 1축 차륜이 조향될 뿐 아니라, 1축 조향각 또는 굴절각과 속도 등의 상태에 따라 2축과 3축 차륜이 조향되는 특징을 가지고 있다. 본 연구에서는 전 차륜 조향장치의 개발 과정을 다룬다. As standard of living is higher and aging society is coming, it is needed to develop transportation that is easy to use for weak person. To comply with the demands, it is started to make Bi-modal Tram that is on KRRI(Korea Railroad Research Institute)'s hands. This tram has to have good accessibility like bus, be low level from ground like subway, and park accurately so wheel chair's or passenger's foot can't fall into the gap. But Bi-modal Tram have long length, so it need development of All Wheel Steering System. The Bi-modal Tram that have all wheel steering system steer not only the first axle but also the second and third axle from the first axle or articulation angle, and velocity, and so on. At this study, we discuss AWS ECU's development process.
표면치밀화 기술에 의해 제조된 소결 기어의 기계적 특성
김기정,김기범,이두환,박종관,정동국,Kim, Ki-Jung,Kim, Ki-Bum,Lee, Doo-Hwan,Park, Jong-Kwan,Jeong, Dong-Guk 한국분말야금학회 2012 한국분말재료학회지 (KPMI) Vol.19 No.3
A novel PM (powder metallurgy) steel for automotive power-train gear components was developed to reduce manufacturing cost, while meeting application requirements. The high-density PM steel was manufactured by mixing using special Cr-Mo atomized iron powders, high-pressure compaction, and sintering. Tensile strength, charpy impact, bending fatigue, and contact fatigue tests for the PM steel were carried out and compared to conventional forged steel. Pinion gears for auto-transmission were also manufactured by helical pressing, sintering, and surface densification process. In order to evaluate the durability of the PM parts, auto-transmission durability tests were performed using dynamometer tests. Results showed that the PM steel fulfilled the requirements for pinion gears indicating suitable tensile, bending fatigue, contact fatigue strengths and improved gear tooth profile. The PM gears also showed good performance during the transmission durability tests. As a result, the PM gears showed significant potential to replace the conventional forged steel gears manufactured by tooth machining (hobbing, shaving, and grinding) processes.
영상처리와 확장칼만필터를 이용한 쿼드로터의 동적 물체 추종
김기정,유호윤,이장명,Kim, Ki-jung,Yu, Ho-Yun,Lee, Jangmyung 제어로봇시스템학회 2015 제어·로봇·시스템학회 논문지 Vol.21 No.7
This paper proposes a new strategy for a quad-rotor to track a moving object efficiently by using image processing and an extended Kalman filter. The goal of path planning for the quad-rotor is to design an optimal path from the start point to the destination point. To lengthen the freight time of the quad-rotor, an optimal path is required to reduce the energy consumption. To track a moving object, the mark signed on the moving object has been detected by a camera mounted first on the quad-rotor. The center coordinates of the mark and its area are calculated through the blob analysis which is one type of image processing. The mark coordinates are utilized to obtain information on the motion direction and the area of the mark is utilized to recognize whether the object moves backward or forward from the camera on the quad-rotor. In addition, an extended Kalman filter has been applied to predict the direction and speed of the dynamically moving object. Through these schemes, it is aimed that the quad-rotor can track the dynamic object efficiently in terms of flight distance and time. Through the two different route freights of the quad-rotor, the performance of the proposed system has been demonstrated.
A Study on the Mitigation of the Exposure Dose Applying Bolus Tracking in Brain Perfusion CT Scan
김기정,정홍량,임청환,홍동희,심재구,유인규,Kim, Ki-Jeong,Jung, Hong-Ryang,Lim, Cheong-Hwan,Hong, Dong-Hee,Shim, Jae-Goo,You, In-Gyu The Society of Digital Policy and Management 2014 디지털융복합연구 Vol.12 No.3
급성기 허혈성 뇌졸중 증상이 있는 뇌 관류 CT 검사를 시행한 환자를 대상으로 장비사가 제시한 고정 시간 기법(Fixed time technique)과 조영제 추적 기법(Bolus tracking technique)을 비교하여 환자의 피폭선량을 분석하고자 하였으며, 조영제 추적 기법의 유용성과 최적의 조영증강 구간을 구현하는 Time graph를 알아보기 위한 것이다. 환자에서는 PCT의 $CTDI_{VOL}$은 고정시간기법에서 431.72mGy, Bolus tracking에서 323.61mGy로 측정되었고, DLP값은 고정시간기법에서 $1243.47mGy{\cdot}cm$, Bolus tracking에서 $932mGy{\cdot}cm$로 측정되었다. Time graph는 고정시간기법에서 다양하게 나타났으나, Bolus tracking 기법에서는 최적의 Time graph를 얻을 수 있었으며, 뇌 관류 CT검사 시 Bolus tracking기법을 적용하여 피폭선량을 25% 정도 감소시킬 수 있었다. This study was conducted to analyze the patient's exposed dose targeting the patients who had acute ischemic stroke symptoms and CT brain perfusion scan, by comparing fixed time technique and bolus tracking technique which was provided by the manufacturer and to identify the Time graph to implement the usability of contrast medium's tracking technique the best contrast enhancement intervals. $CTDI_{VOL}$ of PCT in patient appeared to be 431.72mGy in fixed scan delay protocol, whereas 323.61mGy in Bolus tracking technique. The value of DLP appeared to be $1243.47mGy{\cdot}cm$ in fixed scan delay protocol, whereas $932mGy{\cdot}cm$ in Bolus tracking technique. Time graph appeared to be various in fixed scan delay protocol, whereas the optimal time graph could be obtained in Bolus tracking. The exposure dose could be reduced by 25% applying Bolus tracking technique when taking brain perfusion CT scan.
척수내 종양과 감별을 요하는 비종양성 척수증 : 수술로 확진된 8례의 후향적 분석
김기정,정천기,심기범,김현집,Kim, Ki-Jeong,Chung, Chun-Kee,Sim, Ki-Bum,Kim, Hyun-Jib 대한신경외과학회 2000 Journal of Korean neurosurgical society Vol.29 No.7
Objective : It is difficult to differentiate intramedullary spinal cord tumors preoperatively from non-neoplastic pathologies in patients presenting as non-compressive myelopathies in magnetic resonance imaging(MRI). In this report, the authors reviewed nonneoplastic intramedullary spinal cord lesions preoperatively diagnosed as tumors and discussed their clinical and radiological characteristics and usefulness of surgical intervention. Methods : From January, 1985 to January, 1999, authors experienced eight non-neoplastic pathologies mimicking intramedullary spinal cord tumors and analysed their medical records, radiological findings and histopathological specimens retrospectively. Results : There were five males and three females and the duration of symptoms were from two to 20 months(mean, 9.8 months). The location of lesions were four cervical, one cervicothoracic and three thoracic. All patients manifested sensory abnormality, seven motor weakness, and six bladder symptom. All cases had swollen spinal cords and increased signal intensities in spin-echo sequences. Six cases showed contrast enhancement : four cases were focal and two diffuse. Under the impression of intramedullary tumors, the patients were operated upon. Final diagnoses on the base of clinical and pathologic finding were : three subacute necrotizing myelopathies, two multiple scleroses, two myelopathy of unknown etiology. One case showed no gross abnormality in surgical field in spite of adequate exposure of the lesion, so biopsy was not performed. In that case, postoperative MRI revealed spontaneous resolution of the lesion. Conclusion : MRI is invaluable diagnostic tool in screening myelopathies. However, its high sensitivity and lack of specificity make difficulty in preoperative differential diagnosis of non-compressive myelopathies. Although no surgical morbidity occurred in our series, we sometimes failed to confirm definite diagnosis even with biopsy. In such a circumstance, long-term follow up is needed.