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).

하절기 ‘매향’ 딸기의 삽목 번식 시 관수방법에 따른 생육 및 발근율

김현민(Hyeon Min Kim),김혜민(Hye Min Kim),정현우(Hyeon Woo Jeong),이혜리(Hye Ri Lee),정병룡(Byoung Ryong Jeong),강남준(Nam Jun Kang),황승재(Seung Jae Hwang) (사)한국생물환경조절학회 2018 생물환경조절학회지 Vol.27 No.2

본 연구는 하절기 ‘매향’ 딸기 자묘의 삽목 번식에 적절한 관수 방법을 구명하기 위해 수행되었다. 딸기 자묘의 삽수는 24구 딸기 전용 포트(24구, 60 × 34 × 10cm)에 상업용 혼합 상토(Tosilee)를 이용하여 삽목하고, 반밀폐형 소형비닐터널에 위치시켰다. 각각의 반 밀폐형 소형터널의 처리는 다음과 같이 처리했다; 대조구(무처리), 두상관수(하루 두 번), 매트관수(하루 두 번), 그리고 안개관수(8:00시부터 18:00시까지 30분 온/오프 설정). 딸기 자묘는 반 밀폐형 소형터널 내에서 8일 동안 발근을 하였고, 그 이후 플라스틱 필름을 제거 하였다. 삽목 후 61일째에 초장, 근장, 1차 근수, 엽병장, 엽장, 엽폭, 크라운 직경, 엽록소 값, 엽면적, 지상부와 지하부의 생체중 및 건물중을 측정하였다. 터널 내의 하루 평균 상대습도는 각각 안개관수, 두상관수, 매트관수, 대조구 순으로 72.5, 56.3, 45.8, 그리고 29%를 나타냈다. 그러나 공기온도는 모든 처리에서 유사하였다. 딸기 자묘의 4일째와 8일째 발근율은 두상관수와 안개관수 처리에서 유의적으로 높았다. 초장, 엽병장, 크라운 직경, 엽면적은 두상관수와 안개관수 처리에서 높은 값을 나타냈다. 게다가 지상부의 생체중 및 건물중은 다른 처리에 비해 두상관수와 안개관수 처리에서 무거웠다. 지하부의 건물중은 안개관수 처리에서 유의적으로 무거웠다. 하지만 근장, 1차 근수, 엽록소 값, 지하부의 생체중은 모든 처리구에서 유의적인 차이를 나타내지 않았다. 결과적으로, ‘매향’ 딸기의 삽목 번식 시 생육과 발근율은 두상관수와 안개관수 처리에서 가장 효과적인 것으로 나타났다. This study was conducted to investigate the optimum irrigation method for propagation of cutting strawberry (Fragaria × ananassa Duch. cv. Maehyang) plantlet in summer season. The cutting strawberry plantlets were planted in 24-cell tray (60 × 34 × 10 cm) filled with commercial mixed medium (Tosilee) and placed in semi closedtype small plastic tunnel. Each semi closed-type small plastic tunnel was treated as follows; control (non-treatment), over head irrigation (twice a day), capillary mats irrigation (twice a day), or fog irrigation (30 minutes turn on and 10 minutes off from 8:00 to 18:00). The strawberry plantlets were rooted during 8 days in the semi closed-type small plastic tunnel, and then plastic film was removed. Growth parameters, such as plant height, root length, number of primary roots, petiole length, leaf length, leaf width, crown diameter, SPAD, leaf area, fresh and dry weights of the shoot and root, were measured at 61 days after cutting. Relative humidity in tunnel was high in the order by fog irrigation, over head irrigation, capillary mats, and the control as 72.5, 56.3, 45.8, and 29% on average, respectively. However, the air temperature was similar in all treatments. On the 4 and 8 days, the rooting rate of strawberry plantlet was significantly higher in the over head irrigation and fog irrigation treatments. Plant height, petiole length, crown diameter, and leaf area were highest in the over head irrigation and fog irrigation treatments. In addition, fresh and dry weights of shoot were greater in over head irrigation and fog irrigation treatments than the others. Dry weight of root was differed significantly heaviest in the fog irrigation treatment. However, root length, no. of primary roots, SPAD value, and fresh weight of root were not significantly different in all treatments. These results indicated that growth and rooting for propagation of cutting strawberry plantlet ‘Maehyang’ were best achievement in the over head irrigation and fog irrigation treatments.

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.

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.

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.

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

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.

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

20대 남성의 반페미니즘 의식 학습과 전환학습

김현민(Hyeon Min Kim),김한별(Han Byul Kim) 학습자중심교과교육학회 2023 학습자중심교과교육연구 Vol.23 No.2

목적 본 연구에서는 20대 남성의 반페미니즘 의식을 전환학습의 결과로 볼 수 있는 이론적 근거와 반페미니즘 의식 형성의 사회적 조건을 고찰해보고자 하였다. 방법 이를 위하여 반페미니즘 의식의 형성과 공유라는 사회 현상을 전환학습의 틀로 설명할 수 있는 근거를 고찰하고, 교육학, 사회학 분야의 기존 연구물 및 언론 보도 등을 수집, 검토함으로써 20대 남성의 반페미니즘 의식 형성에 기여한 집단적 전환학습의 사회적 조건을 개념적으로 식별해보았다. 결과 20대 남성의 반페미니즘 의식 학습은 다음과 같은 이유에서 전환학습의 틀로 설명할 수 있다. 첫째, 반페미니즘 의식의 형성은 학습자의 성찰과 그로 인한 정체성의 변화라는 차원에서 전환학습의 개념으로 설명할 수 있다. 둘째, 온라인 커뮤니티 등을 통한 반페미니즘 의식의 확산은 담화를 통한 집단적 전환학습의 결과로 볼 수 있다. 셋째, 반페미니즘 운동의 사례는 전환을 공유하는 개인들이 연대함으로써 사회적 행위로 표출된 것으로 볼 수 있다. 또한 20대 남성의 반페미니즘 의식 형성의 배경이 된 사회적 조건은 다음과 같다. 첫째, 386세대로 대변되는 기성세대가 취업 시장의 상층부를 장악한 후 취업 경쟁이 극심해졌다. 둘째, ‘젠더와 권력이 만난’ 결과로 인식되는 여성 우대 정책들이 실시되었다. 셋째, 잠재적 가해자로서의 남성성을 받아들일 것을 요구하는 시대적 흐름이 있었다. 결론 본 연구는 20대 남성의 반페미니즘 의식 학습이라는 사회적 현상을 전환학습이론으로 해석하고자 하였다. 이는 학습자를 주로 개인으로 한정하는 기존의 학습이론 연구의 범위를 확장하여 세대라는 집단을 학습자로 봄으로써 학습 연구의 지평을 넓히고자 한 것이다. 또한 개개인의 경험이 담화를 통해 공유됨으로써 집단적인 관점의 전환을 낳고, 궁극적으로 집단적 전환이 사회적 실천으로 전개되어 가는 과정을 탐색하는 개념적 토대를 제공한다는 점에서 의의를 찾을 수 있다. Objectives The purpose of this study is to examine the theoretical grounds that the anti-feminism consciousness of men in their 20s can be regarded as the result of transformational learning and the social conditions of the formation of anti-feminism consciousness. Methods To this end, we conceptually confirmed the social conditions of collective transformative learning by explaining the social phenomenon in which anti-feminism is formed and shared among men in their 20s as a framework for transformative learning and reviewing research and media reports in educational research and sociology. Results Anti-feminism consciousness learning of men in their 20s can be explained by the framework of transformative learning for the following reasons. First, the formation of anti-feminism consciousness can be explained by the concept of transformative learning in terms of learner reflection and the resulting change in identity. Second, the spread of anti-feminism consciousness through online communities can be seen as a result of collective transformative learning through discourse. Third, the case of the anti-feminism movement can be seen as expressed as social practice by solidarity of individuals who share the transition. In addition, the social conditions behind the formation of anti-feminism consciousness of men in their 20s are as follows. First, after the older generation, represented by the 386 generation, dominated the upper part of the job market, job competition intensified. Second, preferential policies for women were implemented, which were recognized as the result of ‘the meeting of gender and power’. Third, there was a trend of the times that forced the acceptance of masculinity as a potential perpetrator. Conclusions This study attempted to interpret social phenomena such as anti-feminism consciousness learning of men in their 20s as transformative learning theory. This is to expand the scope of existing learning theory research, which mainly limited learners to individuals, and to expand the horizon of learning research by targeting a group called generation. It is also meaningful in that it brings about a change in collective perspective by sharing individual experiences through discourse, and ultimately provides a conceptual basis for exploring the process of developing collective transformation into social practice.

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.