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김경기,김용진,안중호,Kim, Kyung-Ki,Kim, Yong-Jin,Ahn, Jung-Ho 한국분말야금학회 2011 한국분말재료학회지 (KPMI) Vol.18 No.1
$Y(OH)_3$ nanowires were synthesized by a hydrothermal reaction of metallic Y with aqueous solution of LiOH. The morphology and the size of the nanowires changed with varying the volume of the LiOH solution inside the autoclave. $Y(OH)_3$ nanowires transformed to $Y_2O_3$ by a subsequent heat-treatment without morphological change. By a proper control of hydrothermal reaction parameter and heat-treatment, the yield of pure $Y_2O_3$ nanowires up to 97% was attained.
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A Case of Intradural Epidermoid Tumor in Lumbar Region
김경기,최창화,고준경 대한신경외과학회 2004 Journal of Korean neurosurgical society Vol.36 No.1
The authors describe a case of intradural epidermoid tumor in which the patient presented with low back pain and weakness of right lower extremity. The magnetic resonance imaging study showed intraspinal mass lesion at L2-3. The patient had no history of previous lumbar puncture. It was removed totally through laminectomy of L2 and L3 without any injury of the neural structure. The pathological findings were compatible with epidermoid tumor. The postoperative course was uneventful without any neurologic deficit. Characteristics of this lesion with a pertinent literature is reviewed.
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김경기,Kim, Gyeong-Gi 한국방위산업진흥회 1993 國防과 技術 Vol.- No.169
유도탄에 의존하는 전투 경향은 향후 계속적으로 증대될 것이며 더구나 유도탄은 지금까지 설명한 것 같이 장거리화, 고속화, 스텔스화, 고고도 또는 저고도 탄도선택, 명중 직전까지 탐지 곤란 및 최종유도 단계에서 고가속도 운동 등 성능은 향상 일로에 있습니다. 함정의 생존성을 제고시키기 위한 각국의 대함유도탄 방어체계 개발 노력은 함정 탑재 무기체계인 근접방어 무기체계, 함대공유도탄, ESM 및 유도탄 기만 장치의 지속적인 성능개량과 함께 지속될 것입니다
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김경기,서강태,정동수 대한설비공학회 2000 설비공학 논문집 Vol.12 No.12
In this study, condensation heat transfer coefficients(HTCs) of 2 nonazeotropic refrigerant mixtures of HFC32/HFC134a and HFC134a/HCFC123 at various compositions were measured on a horizontal smooth tube. All data were taken at the vapor temperature of 39$^{\circ}C$ with a wall subcooling of 3~8K. Test results showed that HTCs of tested mixtures were 11.0~85.0% lower than the ideal values calculated by the mass fraction weighting of the pure components HTCs. Thermal resistance due to the diffusion vapor film was partly responsible for the significant reduction of HTCs with these nonazeotropic mixtures. The measured data were compared against the predicted ones by Colburn and Drew\`s film model and a good agreement was observed.
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김경기,박지웅,조준희 대한토목학회 2020 KSCE Journal of Civil Engineering Vol.24 No.11
For effective pre-construction process, engineers create a 4D building information model (BIM). However, the rich information associated with the creation of the 4D BIM leads to manual effort. Past studies explored methods that automatically generate construction schedules using 3D building models. However, no method properly utilized relationships between building elements to robustly generate 4D BIMs that are structural stable during installation. This research presents an approach to the automated generation of structurally stable construction sequences using a 3D BIM. Focusing on steel erection, we create a framework integrating a 3D BIM and algorithms to create a 4D BIM with detailed steel erection sequences of individual elements. This research explores an approach to a variation of static indeterminacy for each installation process of steel elements. The principle of this approach is based on the relationships among the nodes and the connections among steel elements, information about which is available to those involved in the project. For validation, we test a prototype software program using a BIM for a real-world construction project. The results indicate that the prototype utilizing the static indeterminacy variation could generate a large number of random sequences and successfully transforms them into stable sequences. This study establishes the foundational step of generating constructible sequences using structural information in BIM which is found to be more robust than previous approaches, and results of this study can lead to follow up studies for full automation such as automated analysis and optimization of the sequences.
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김경기,서강태,채순남,정동수 대한설비공학회 2002 설비공학 논문집 Vol.14 No.2
In this study, external condensation heat transfer coefficients (HTCs) of two non-azeotropic refrigerant mixtures of HFC32/HFC134a and HF0134a/HCF0123 at various compositions were measured on both low fin and Turbo-C enhanced tubes of 19.0 mm outside diameter All data were taken at the vapor temperature of 39$^{\circ}C$ with a wall subcooling of 3- 8 K. Test results showed that HTCs of the tested mixtures on the enhanced tubes were much lower than the ideal values calculated by the mass fraction weighting of the pure compo- nents'HTCs. Also the reduction of HTCs due to the diffusion vapor film was much larger than that of a plain tube. Unlike HTCs of pure fluids, HTCs of the mixtures measured on enhanced tubes increased as the wall subcooling increased, which was due to the sudden break up of the vapor diffusion film with an increase in wall subcooling. Finally, heat transfer enhancement ratios for mixtures were found to be much lower than those of pure fluids.
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경추간반탈출증환자에 대한 후방 추궁 절제 및 추간공확장술의 수술 결과
김경기,최병관,최창화 대한신경외과학회 2004 Journal of Korean neurosurgical society Vol.36 No.2
Objective : Whether the anterior approach is better than the posterior one for cervical disc disease still remains unsettled. However, anterior discectomy and fusion procedures for all types of discs have been more popular than the posterior one. Posterior approach should not be underestimated since it has many benefits. To study it's feasibility, the effectivenes and safety of the lamino-foraminotomy for cervical disc disease, we review 10 surgical cases with posterior approach. Methods : Ten consecutive cervical lateral disc protrusion cases which underwent lamino-foraminotomy with or without discectomy were reviewed. Patient's age, sex, main symptom, EMG studies, surgical procedure were studied retrospectively. The outcome was rated with Prolo's scale. Results : There were one female and nine male patients. Major preoperative symptoms were radicular pain radiating to upper extremity, numbness, axial neck pain and motor weakness. Electromyography was performed in eight cases with six correspondent results. Lamino-foraminotomy was performed in all cases and discectomy was done in nine patients. By modified Prolo's outcome scale, nine patients enjoyed good results and one was moderate, nine patients were able to carry on their original occupations. The mean hospital stay was 14.6 days. There was no postoperative instability. Conclusion : With posterior approach, critical complications of anterior approach could be averted. No bone graft is needed. No graft donor site pain is expected either. Hostpital stay could be shortened. The posterior foraminotomy is an easy and effective procedure in the treatment of patients for laterally located soft disc herniations.
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