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재난재해로 인한 통신두절시 오감기술을 이용한 무인 수처리 기술 개발
김재열(Jae-Yeol Kim),유관종(Kwan-Jong You),정윤수(Yoon-Soo Jung),안태형(Tae-Hyoung Ahn) 한국기계가공학회 2017 한국기계가공학회지 Vol.16 No.1
Recently, localized heavy rain storms have been occurring frequently due to global warming, and it is difficult to shield a large number of facilities against disaster with limited manpower. The unmanned water treatment system uses five senses to analyze various judgment criteria, which are set according to field situations such as machine vibrations, the temperature of bearings, the sound of the operating machines, and the hydraulic pressure, current, and voltage of the hydraulic floodgates. It thus judges normal or abnormal operation status and conducts unmanned control of such machines. It automatically applies a system to the interruption of communications and therefore improves the reliability of its unmanned irrigation facilities. It maximizes the operational efficiency of managers responsible for various fields, enabling them to discharge water before the situation escalates to a crisis within the golden time, and to protect against damage to humans and property.
스마트워터그리드 맞춤형 기계과부하시 오감기술을 이용한 무인 수처리 시스템에 관한 연구
김재열(Jae-Yeol Kim),유관종(Kwan-Jong You),정윤수(Yoon-Soo Jung),안태형(Tae-Hyoung Ahn),이학재(Hak-Jae Lee) 한국기계가공학회 2017 한국기계가공학회지 Vol.16 No.2
In or To use, manage, and preserve sustainable water resources for the current and future generations amid the threat of abnormal climate, it is necessary to establish a smart water grid system, the next-generation intelligent water management system. In this study, sensors, which make use of the five senses to watch, listen, and detect machine vibration, bearing temperature, machine operation sounds, current, voltage, and other symptoms that cannot be verified when the irrigation facilities are running, are used to establish various decision-making criteria appropriate to on-site situations. Based on such criteria, the unmanned conditions in the facilities were verified and analyzed. Existing technologies require on-site workers to check any defects caused by overloading of machines, which is the biggest constraining factor in the application of an unmanned control system for irrigation facilities. The new technology proposed in this study, on the other hand, allows for the unmanned analysis of the existence of machine vibration. This controls the decision-making process of any defect based on the analysis results, and necessary measures are taken automatically, resulting in improved reliability of the unmanned automation.
Detection and Comparison of Surface Defects in Pipe Welds
Yoon-Soo Jung(정윤수),Jia-Chen Gao(고가진),Tae-Hyoung Ahn(안태형),Jae-Yeol Kim(김재열) 한국기계가공학회 2020 한국기계가공학회지 Vol.19 No.1
At present, 24 nuclear power plants are in operation nationwide as the main power source responsible for about 27% of Korea"s electricity, and five nuclear power plants are currently under construction. Issues of nuclear safety and reliability have always existed, but after the Fukushima accident, ensuring reliability has become an even more important issue for safety. Compared to other kinds of accidents, the initial response after a nuclear accident is more important than any other accident. Prior to accidents, it is important to be able to predict and judge the accident in advance for the sake of prevention. In this research, non-destructive inspection methods for existing pipe welds include radiographic, ultrasonic, magnetic particle practice , and liquid penetration testing. For this experiment, carbon steel pipes like that of the material used in nuclear pipes were adopted, and specimen welded to the flange (Flange) were manufactured. After testing, the weld specimen were not damaged through the infrared thermography (IRT) experiment. This study attempted to improve the safety of carbon steel pipes through a comparative analysis of finite element analysis.
V.S.P(Variable Screw Placement) Plate를 이용한 Unstable Thoraco-Lumbar Spine에 대한 치험
이성태,장석정,김충현,안태형,도성신,신호 대한신경외과학회 1989 Journal of Korean neurosurgical society Vol.18 No.4
Fourteen consecutive patients underwent application of V.S.P.(Variable Screw Placement) spinal plate between January 1989 and July 1989. Operative indications were spondylolisthesis, spinal stenosis, segmental instability, herniated disc with instability, pseudoarthrosis, unstable fracture, and failed surgery syndrome. Our patients consist of 8 cases of spondylolisthesis, 4 cases of fracture-dislocation, one case of spondylolysis with instability, one case of herniated disc(L1-2 interspace). Overall results showed 36% excellent, 50% good, 7%, fair, 7% poor. Two deep wound infections were observed. Screw alignment and the angular relationship of each screw to the spinal plate is considered as important technical factors in minimizing screw failure.
불안정성 흉·요추부 질환에서 Kaneda기구를 이용한 전방융합술
양의중,안계훈,김충현,장석정,안태형,도성신,신호 대한신경외과학회 1990 Journal of Korean neurosurgical society Vol.19 No.2
Recently anterior spinal device in the treatment of the unstable thoraco-lumbar spine has been used. We have experienced 11 patients of the unstable thoraco-lumbar spine, which were composed of 8 patients with burst fracture and 3 patients with tuberculous spondylitis. The 11 patients with neurological deficit were treated with an one stage anterior operation consisting of anterior decompression through vertebrectomy, realignment with Kaneda device. No patient showed neurologic deterioration after surgery. The anterior spinal instrumentation with Kaneda device affored enough stability to enable early ambulation with good alignment and solid fusion.