치근단 감염 치아의 치근단 수술 후 예후에 관한 후향적 연구

김현민,박철휘,이상칠,김동우,박대송,정진환,이슬기,송민석,Kim, Hyeon-Min,Park, Chul-Hwi,Lee, Sang-Chil,Kim, Dong-Woo,Park, Dae-Song,Jung, Jin-Hwan,Lee, Seul-Ki,Song, Min-Seok 대한악안면성형재건외과학회 2010 Maxillofacial Plastic Reconstructive Surgery Vol.32 No.3

Purpose: The purpose of this retrospective clinical study was to monitor the outcomes of periapical surgery in periapically infected tooth with or without retrograde filling materials (MTA or IRM). Patients and Methods: A total of 85 teeth in 63 patients were included in the study between November 2004 and August 2008. Randomly, MTA or IRM was used as a retrograde filling material or only apical resection without retrograde filling. Teeth with advanced periodontal bone loss or presence of root fracture were excluded from the study. The patients were subjected to a minimum follow-up period of 12 months, with a mean of 17.1 months. Results: Successful healing was observed in 83.3% of the MTA-treated teeth, 80% of the IRM-treated teeth and 75% of the teeth which was not retrograde filling. Doubtful healing was seen 9.3% (MTA), 13.3% (IRM), 12.5% (no retro-filling). The success rate of upper incisors (92%) was higher than lower lincisor and molars (66.7% and 50%, respectively). Conclusion: In this study, periapical surgery including retrograde filling improves the prognosis. And, no statistically significant differences were found between retrograde filling materials (MTA or IRM).

Device-to-Device 통신을 위한 거리 정보 기반 자원 할당 기술

김현민(Hyeon Min Kim),남종현(Jong Hyeon Nam),강길모(Gil Mo Kang),신오순(Oh-Soon Shin) 한국통신학회 2013 한국통신학회 학술대회논문집 Vol.2013 No.1

3축 힘센서를 이용한 두 손가락 힘측정장치 개발

김현민(Hyeon-Min Kim),윤정원(Jongwon Yoon),신희석(Hee-Suk Shin),김갑순(Gab-Soon Kim) 제어로봇시스템학회 2010 제어·로봇·시스템학회 논문지 Vol.16 No.9

Stroke patients can’t use their hands because of the paralysis their fingers. Their fingers are recovered by rehabilitating training, and the rehabilitating extent can be judged by measuring the pressing force to be contacted with two fingers (thumb and first finger, thumb and middle finger, thumb and ring finger, thumb and little finger). But, at present, the grasping finger force of twofinger can’t be accurately measured, because there is not a proper finger-force measuring system. Therefore, doctors can’t correctly judge the rehabilitating extent. So, the finger-force measuring system which can measure the grasping force of two-finger must be developed. In this paper, the finger-force measuring system with a three-axis force sensor which can measure the pressing force was developed. The three-axis force sensor was designed and fabricated, and the force measuring device was designed and manufactured using DSP (Digital Signal Processing). Also, the grasping force test of men was performed using the developed finger-force measuring system, it was confirmed that the grasping forces of men were different according to grasping methods.

손가락 재활로봇의 5축 힘/모멘트센서를 이용한 손 누름제어

김현민 ( Hyeon Min Kim ),김갑순 ( Gab Soon Kim ) 한국센서학회 2012 센서학회지 Vol.21 No.3

This paper describes the control of the hand fixing system attached to the finger rehabilitation robot for the rehabilitation exercise of patient`s fingers. The finger rehabilitation robot is used to exercise the finger rehabilitation, and a patient`s hand is safely fixed using the hand fixing system. In this paper, the hand fixing system was controlled with PD gains to fix a palm of the hand, and the characteristic test for the hand fixing system was carried out to sense the fixed hand movement of the front and the rear, that of the left and the right, and that of the upper. It is thought that the hand fixing system could safely fix the hand, and the movement of the fixed hand could be perceived using the five-axis force/moment sensor attached to the hand fixing system.

스마트폰 곡면유리 성형시스템의 가압장치 설계 및 곡면유리 성형특성실험

김현민(Hyeon-Min Kim),홍태경(Tae-Kyung Hong),정동연(Dong-Yean Jung),이연형(Yeon-Hyeong Lee),박재현(Jea-Hyun Park),김갑순(Gab-Soon Kim) 제어로봇시스템학회 2014 제어·로봇·시스템학회 논문지 Vol.20 No.5

This paper describes the design of a force applying system for a smart phone curved glass molding system and its characteristic test. The force applying system is composed of a motor and gear, a rectilinear movement structure, a force sensor, an LVDT (Linear Variable Differential Transformer) sensor, an up and down moving block, and so on. The system precisely controls the applying force and time to the plane glass because the glass can be easily destroyed under applied force, and can be bent imperfectly. As a result of the characteristic test, the curved glass can be manufactured using this system, and the holding time under 0N force, the applying force to the plane glass, the time for applying from 0N to maximum force, and the holding time under maximum force at the manufacture feasible temperature 620℃ were found.

LTE-Advanced 네트워크에서 셀간 D2D 통신을 위 한 거 리정보 기반 자원할당 및 전력제어 기법

김현민(Hyeon Min Kim),신오순(Oh-Soon Shin) 한국통신학회 2014 한국통신학회 학술대회논문집 Vol.2014 No.6

현장 실측을 통한 Pico-Hydropower System(PHPS)의 건물 급수설비 적용성 검토

김현민(Hyeon Min Kim),이신혜(Shin Hye Lee),정창호(Chang Ho Jeong),여명석(Myeong Seok Yeo) 대한설비공학회 2022 대한설비공학회 학술발표대회논문집 Vol.2022 No.6

A pico-hydropower system (PHPS) can be utilized as a renewable clean energy in building in-pipe system, but its feasibility is still on debate. This is because of the lack of related standards and limited real-site installations. In this study, some paper reviews regarding PHPS and building integrated PHPS examples are introduced. Also, data had been collected from the only PHPS-installed residential building in Korea to analyze the amount of generated power and the in-pipe water flow condition, e.g., pressure, from March 28, 2022 to May 2, 2022. The results show that the daily average energy generation is 21.1kWh and its standard deviation is only about 7%, which implies that the stable daily energy production can be expected from PHPS.

흑목이 버섯 열수추출 다당의 성분 및 구조적 특성

김현민(Hyeon-Min Kim),허원(Won Hur),이신영(Shin-Young Lee) 한국생물공학회 2009 KSBB Journal Vol.24 No.6

A hot-water extract from fruit body of Auricularia auricula was purified by ethanol precipitation and subsequent dialysis. The polysaccharide showed a typical IR spectrum similar to β-glucan and was composed of glucose and mannose in a molar ratio of 16.8:83.2 indicating that it is a glucomannan. A glucomannan-like polysaccharide was also identified from Tremella fuciformis. Both of the polysaccahrides showed the presence of acetyl groups and presented colorimetric responses for β-1,4-glucomannan indicating the acetylated β-glucomannan similar to the typical polysaccharide found in Aloes.

단축 힘센서를 이용한 두 손가락 잡기 힘측정장치 개발 및 특성평가

김현민 ( Hyeon Min Kim ),신희석 ( Hi Suk Shin ),윤정원 ( Joung Won Yoon ),김갑순 ( Gab Soon Kim ) 한국센서학회 2011 센서학회지 Vol.20 No.3

Finger patients can`t use their hands because of the paralysis their fingers. Their fingers are recovered by rehabilitating training, and the rehabilitating extent can be judged by measuring the pressing force to be contacted with two fingers(thumb and first finger, thumb and middle finger, thumb and ring finger, thumb and little finger). At present, most hospitals have used a thin plastic-plate for measuring the two-finger grasping force, and we can only judge that they can grasp the plate with their two-finger through it, because the plate can`t measure the two-finger grasping force. But, recently, the force measuring system for measuring two-finger grasping force was developed using three-axis force sensor, but it is very expensive, because it has a three-axis force sensor. In this paper, two-finger force measuring system with a one-axis force sensor which can measure two-finger grasping force was developed. The one-axis force sensor was designed and fabricated, and the force measuring device was designed and manufactured using DSP(Digital Signal Processing). Also, the grasping force test of men was performed using the developed two-finger force measuring system, it was confirmed that the grasping forces of men were different according to grasping methods, and the system can be used for measuring two-finger grasping force.

3축 힘센서를 이용한 구물체 잡기 손가락 힘측정시스템 개발

김현민 ( Hyeon Min Kim ),김갑순 ( Gab Soon Kim ) 한국센서학회 2010 센서학회지 Vol.19 No.3

Stroke patients can`t use their hands because of the paralysis of their fingers. Their fingers are recovered by rehabilitating training, and the rehabilitating extent can be judged by grasping a spherical object. At present, the object used in hospital is only a spherical object, and can`t measure the force of fingers. Therefore, doctors judge the rehabilitating extent by touching and watching at their fingers. So, the spherical object measuring system which can measure the force of their fingers should be developed. In this paper, the finger-force measuring system with a three-axis force sensor which can measure the spherical-object grasping force is developed. The three-axis force sensor is designed and fabricated, and the force measuring device is designed and manufactured using DSP(digital signal processing). Also, the grasping force test of men is performed using the developed finger-force measuring system, it was confirmed that the average force of men was about 120 N.