35㎛ 점탄성수지가 적용된 1.035㎜ 제진강판의 이종소재간 저항점용접 특성분석

배기만(Ki-Man Bae),백종진(Jong-Jin Baek),신창열(Chang-Yeul Shin),김승경(Seung-Kyung Kim),강명창(Myungchang Kang) 한국기계가공학회 2021 한국기계가공학회지 Vol.20 No.12

Recently, owing to the high demand for eco-friendly cars in the automotive industry, noise and vibrations have become major challenges. The use of laminated damping steel is increasing in response to these demands. Laminated damping steel is primarily used in sound insulation plates. The vibration energy is converted into thermal energy due to the viscoelastic resin being located between two steel sheets and being able to damp the vibrations when an external force, such as, noise or vibration is applied to the steel plate. Laminated damping steel is chiefly applied to dash panels in automotive body parts, and because of its structure, junction technology for bonding with other components is necessary. However, there has not been sufficient research conducted on junctions. In this study, regardless of the electrode shape, in the range of 4.0 ~ 8.0 kA welding current, the same welding force and welding time were applied which were 2.8 kN and 200 ㎧ (12 cycles) and the tensile shear load and nugget size were analyzed after the resistance spot welding between different materials of laminated damping steel with a thickness of 1.035 mm. The results show that in the range of 5 ~ 8 kA welding current, 1.035 mm laminated damping steel meets the MS181-15 standard, which is the technical standard of Hyundai-Kia Motors.

줄 히팅을 이용한 아스팔트패드 간접가열에 있어서 통전시간별 융착성 평가

배기만(Ki-Man Bae),최한석(Han-Suk Choi),오보라미(Bo-Ra-Mi Oh),백종진(Jong-Jin Baek),박성환(Seong-Hwan Park),강명창(Myungchang Kang),이재진(Jae-Jin Lee) 한국기계가공학회 2020 한국기계가공학회지 Vol.19 No.8

Recently, vibration and noise have become an important issue in the auto industry. Asphalt vibration damping pads are used to reduce the noise and vibration of automobile bodies, and asphalt is used for many mass-produced parts due to its simple attachment process and low processing costs. In this study, the self-adhesion of asphalt pads using Joule heating was evaluated. To create the asphalt pad for the experiment, the asphalt pad was molded into a specific thickness by using SGACC material and rubber used in the vehicle body as a main component and a modified resin and filler. The SGACC material was 200 mm in length, 200 mm in width, and 0.7 mm in thickness. The asphalt pad was 200 mm in length, 100 mm in width, and 3 mm in thickness. The equipment was composed of a TR (Transformer) DC254kVA and a TC (Time controller) for a current of up to 20,000 A. The current for the Joule heating was set to 7.0 kA and a 3/1 cycle, for which the adhesion of the asphalt pad over the current flow time was evaluated.

크롤러 방식 터널로봇의 모션제어 알고리즘

배기만,이상룡,이상일,이춘영,Bae, Ki-Man,Lee, Sang-Ryong,Lee, Sang-il,Lee, Choon-Young 대한임베디드공학회 2008 대한임베디드공학회논문지 Vol.3 No.2

The pipes have been laid underground while the industry is developing. We have to take maintenance procedure when the pipes are cracked or ruptured. It is very difficult jop to check pipe's crack because the pipes are narrow and laid underground. Using in-pipe robot, we can check the conditions of inner section of pipes, therefore, we designed a crawler type robot to search cracked pipe. In this paper, we have made a special focus on the control of the robot using differential drive algorithm to move in curved section of pipes. The detailed design of the robot with experimental result show the effectiveness of the robot in pipe maintenance.

가속도센서를 이용한 운전패턴 인식기법

허근섭(Gun Sup Hhu),배기만(Ki Man Bae),이상룡(Sang-Ryong Lee),이춘영(Choon-Young Lee) 제어로봇시스템학회 2010 제어·로봇·시스템학회 논문지 Vol.16 No.6

In this paper, we proposed an algorithm to detect aggressive driving status by analysing six kinds of driving patterns, which was achieved by comparing for the feature vectors using mahalanobis distance. The first step is to construct feature matrix of 6×2 size using frequency response of the time-series accelerometer data. Singular value decomposition makes it possible to find the dominant eigenvalue and its corresponding eigenvector. We use the eigenvector as the feature vector of the driving pattern. We conducted real experiments using three drivers to see the effects of recognition. Although there exists differences from individual drivers, we showed that driving patterns can be recognized with about 80% accuracy. Further research topics will include the development of aggressive driving warning system by improving the proposed technique and combining with post-processing of accelerometer signals.

본태성 수장부 다한증 환자에서 선택적인 T3 교감신경 차단술

윤승환,조준,문창택,장상근,배기만,Youn, Seung-Hwan,Cho, Joon,Moon, Chang-Taek,Chang, Sang-Keun,Bae, Ki-Man 대한신경외과학회 2000 Journal of Korean neurosurgical society Vol.29 No.11

Objectives : In general, conventional T2, T3 thoracoscopic sympathicotomy must be one of the most effective treatments for the essential palmar hyperhidrosis. However, this is offset by the occurrence of a high rate of side effects, such as embarrassing compensatory sweating and Hornor's syndrome. The authors have performed a selective T3 thoracoscopic sympathicotomy to our patients to see whether it provides successful results with less side effects. Its preliminary results were compared with those of conventional T2, T3 thoracoscopic sympathicotomy. Methods : The thoracoscopic sympathicotomy was performed in 54 patients suffering from essential palmar hyperhidrosis. Twenty-four patients underwent a conventional sympathicotmy(group A) from Jan 1997 to Dec 1997 and 30 patients a selective T3 sympathicotmy(group B) from Jan 1998 to Dec 1999. For assessment of postoperative success and of complications all patients charts were reviewed. Patients further received a postal questionnaire regarding long-term effect, satisfaction, and side-effects. Results : No recurrence was observed in both groups. The global rate of compensatory sweating was significantly(p =0.020) different in both groups : 11 patients(45.8%) in group A and 5 patients(16.73%) in group B. The Hornor's syndrome was observed only in 4 patients in group A. The preliminary results of the procedure in group A were considered fully-satisfying by 16 patients(66.6%), 6 patients(25%) were satisfied partially, and only 2 patients(8.3%) were dissatisfied, and those of the procedure in group B satisfying by 26 patients(86.6%), 4 patients(13.3.% ) were satisfied partially, and none dissatisfied. Conclusion : The selective T3 sympathicotomy results in a significant decrease in the rate of disturbing side effects comparing to conventional T2, T3 sympathicotomy and it dose not lead to recurrence. Our results contribute to recommendations of a selective T3 thoracoscopic sympathicotomy as treatment of choice in essential palmar hyperhidrosis.

USN 기반 탱크로리 운행 안전 모니터링 시스템

류시현(Si-Hyun Ryu),박근영(Geun-Young Park),배기만(Ki-man Bae),이상룡(Sang-Ryong Lee),이춘영(Choon-Young Lee) 한국에너지학회 2008 한국에너지공학회 학술발표회 Vol.2008 No.-

독성가스나 가연성 폭발 위험이 있는 원료를 운반하는 탱크로리 및 벌크로리는 출발지에서부터 목적지 및 중간 경로를 따라 지속적으로 차량 및 탱크의 상태를 모니터링하는 것이 안전을 위해 필요하다. 따라서 본 논문은 탱크로리 운행에 관한 안전 모니터링 시스템에 관하여 제안하고, 차량에 부착된 여러 센서노드들을 통한 차량의 주행상태를 실시간으로 모니터링 및 저장하며, 센서 데이터를 기반으로 차량의 위험도를 판단하는 알고리즘을 적용하여 운전자에게 경고할 수 있도록 하는 탱크로리용 안전 시스템 및 중앙 관제 시스템과의 연계에 관해 고찰한다.

결핵성 늑막 삼출증 환자에서 비디오 흉강경을 이용한 수술

배기만 건국대학교 의과학연구소 1999 건국의과학학술지 Vol.9 No.-

Tuberculous pleurisy is a common clinical manifestations and the traditional methods of treatment are anti-tuberculous medication and thoracentesis. However, high incidence of complications and prolonged hospital stay occurring with the traditional treatment necessitated new therapeutic modalities. Recently, the VATS(video-assisted thoracoscopic surgery) was introduced and rapid progression of its indications and techniques were made and we evaluated the effectiveness of the VATS in tuberculous pleurisy patients. From Mar.1997 to Feb. 1999, 45 patients with tuberculous pleurisy underwent video-assisted thoracoscopic pleural biopsy and closed thoracostomy drainage. The mean operative time was 27.3±5.5 minutes and mean duration of chest tube indwelling was 5.5±1.6 days with the mean hospital stay of 8.6±2.6 days. The most frequently occurring complications were dead spae in the pleural cavity and atelectasis although they were not significant. The follow up chest X-ray revealed excellent recovery in 16(35.6%) cases, good recovery in 20(44.4%) cases, fair recovery in 6(13.3%) cases and poor recovery in 3(6.6%) cases. In this study, video-assisted thoracoscopic pleural biopsy and drainage is relatively easy resulting excellent outcomes and minimal complications, therefore, we think that VATS is effective methods in treating patients with the tuberculous pleurisy.

Ti-6Al-4V 합금의 α상 형상에 따른 미세균열 생성거동

장영원,박찬경,이종수,배기만 대한금속재료학회(대한금속학회) 1993 대한금속·재료학회지 Vol.31 No.1

The purpose of this study is to investigate the deformation characteristics and microcrack initiation behavior depending on the microstructure of Widmanstatten-α(Wα) and equiaxed-α(Eα) in a Ti-6Al-4V Alloy. In Wα structure, microcracks were observed to form along the α/β interfaces, the colony boundaries and the grain boundary α layers both in tension and fracture tests. In Eα structure, most of microvoids were found to form at the α/β interfaces. The lower tensile strength and ductility of Wα structure was mainly due to the strain localization along the prior β grain boundaries and colony boundaries, which was preceded by the easy slip transfer through α/βinterfaces within the colony. The large increase in fracture toughness of Wα structure was, however, primarily attributed to the crack path deviation depending on the colony orientation.