정상인에서 5가지 체간 안정화 운동자세가 초음파 영상을 이용한 복부근 두께에 미치는 영향

강정현 ( Jung Hyun Kang ),심재훈 ( Jae Hyun Shim ),천승철 ( Seung Chul Chon ) 한국전문물리치료학회 2012 한국전문물리치료학회지 Vol.19 No.3

The aim of this study is to compare measurements of abdominal muscle thickness using ultrasonography imaging (USI) to those using a special transducer head device, during five different trunk stabilization exercises, ultimately to determine which exercise led to the greatest muscle thickness. Thirty eight healthy subjects participated in this cross-sectional study. The five types of trunk stabilization-i.e., a sit-up on the supine, an upper and lower extremity raise with quadruped on the prone, a leg raise in sitting on the ball, trunk rolling on the ball, and balance using sling on the prone position-were each performed with an abdominal draw. The thickness of the abdominal muscle-including the transverse abdominal (TrA), internal oblique (IO), and external oblique (EO)-was measured by USI with a special transducer head device, at rest and then at contraction in each position. Data were analyzed using one-way repeated ANOVA with the level of significance set at α=.05. The results were as follows: 1) the TrA thickness was statistically significant (p<.05), whereas the IO and EO thicknesses were not (p>.05); 2) among the five types of trunk stabilization, TrA thickness significantly increased with the balance using a sling in the prone position, (p<.05), whereas no significant difference was noted for the four types of trunk stabilization (p>.05); 3) reliability data showed that there was a high degree of consistency among the measurements taken using the special transducer head device (ICC=.92). In conclusion, the balance using a sling in the prone position was more effective than any of the four other types of trunk stabilization in increasing TrA thickness in healthy subjects.

초분광 영상을 이용한 오이, 토마토 모종의 수분함유량 추정

강정균 ( Jeong Gyune Kang ),유찬석 ( Chan Seok Ryu ),김성헌 ( Seong Heon Kim ),강예성 ( Ye Seong Kang ),( Tapash Kumar Sarkar ),민영봉 ( Young Bong Min ),강동현 ( Dong Hyeon Kang ) 한국농업기계학회 2016 한국농업기계학회 학술발표논문집 Vol.21 No.1

IT 벤처기업의 종업원의 역할갈등이 직무몰입과 직무만족에 미치는 영향에 관한 연구

강정현(Jung hyun Kang),정대율(Dae yul Jeong) 한국창업학회 2012 한국창업학회지 Vol.7 No.2

Recently, the demand of mobile applications increased explosively, the IT venture companies in Korea, more than 90% of them are small and medium enterprise, have difficulty in the personnel management due to the frequent turnover of the his workforce. Most of employees of IT venture company who are expert in information technology and system development are suffering from role conflicts due to the over expectancy of his/her supervisor and work overloading. Many researchers have been proved that the role conflicts influence on the job performance and job satisfaction negatively. That s why most employees leave the organization or turn over the job. We propose a research model that hypothesize the relationship among the role conflicts, job involvement, and job satisfaction, and also the leadership will moderate the role conflicts and the dependent variables, job involvement and job satisfaction. The results of the hypothesis test were some different from the previous researches, in which, the role conflicts affected to the job satisfaction significantly but there was no evidence that the role conflicts affect to the job involvement. So, the model needed more explanatory variables, such as leadership to explain our research domain situation. We classified the leadership as three type, servant, transactional, and transformational leadership. We are interest in which leadership type is more effective in moderating the role conflicts. The empirical test showed that the servant leadership was most effective, but transactional leadership wasn t effective. The transformational leadership moderated effectively to the job satisfaction, but wasn t to the job involvement. From the hypothesis tests, we could derive some important implications to the IT personnel management.

초분광 영상을 이용한 오이 모종의 수분함유량 추정

강정균 ( Jeong Gyune Kang ),유찬석 ( Chan Seok Ryu ),민영봉 ( Young Bong Min ),강동현 ( Dong Hyeon Kang ) 한국농업기계학회 2015 한국농업기계학회 학술발표논문집 Vol.20 No.2

유아 교사의 혁신유치원 근무 경험 탐색

강정현(Kang, Jeong-Hyun),권귀염(Kwon, Kyee-Yum) 한국영유아교원교육학회 2021 유아교육학논집 Vol.25 No.2

본 연구는 유아 교사들의 혁신유치원 근무 경험을 탐색하는 것을 목적으로 한다. 혁신유치원에 근무한 경험이 있는 5명의 유아 교사가 연구에 참여하였으며, 자료 수집은 각 참여자들과의 개별 심층 면담 2회, 그룹 면담 1회, 관련 문서자료의 수집을 통해 이루어졌다. 자료 분석 결과, 참여자들은 혁신유치원 근무 경험이 자신을 성찰하고 재도약하는 시간이었으며, 특히 수업 나눔이 도움이 되었다고 하였다. 이들은 소통의 중요성을 깨닫고 다양한 구성원들과 소통을 시도하였으며, 위계적인 현재의 유치원 조직문화에 대해 고민하였다. 이 과정에서 참여자들은 혁신유치원의 성패를 좌우하는 핵심은 제도가 아닌 사람임을 깨닫게 되었다. 또한 혁신유치원 운영 과정에서의 불합리함과 어려움을 경험하면서 문제의식을 느끼고 정책의 진정한 의미 실현에 대해 고민하기도 하였다. 이러한 연구 결과를 바탕으로 교육적 측면, 조직문화 측면, 정책 실행 측면에서의 시사점을 논의하였으며, 후속 연구를 제안하였다. This study aimed to explore early childhood teachers’ experiences in innovative kindergartens. Five early childhood teachers who had experiences in working at innovative kindergartens participated in the study. Data were collected through two in-depth individual interviews with each participant, a group interview, and gathering related documents. The results of data analysis are as follows. By working in the innovative kindergartens, the participant teachers were able to reflect and re-develop themselves as educators; lesson-sharing was particularly helpful. They recognized the importance of communication, and tried to interact with diverse kindergarten members. The hierarchical organizational culture of kindergartens was a point of concern to them. The teachers realized that the success of innovative kindergartens depends on people, not the system. Since the participants became aware of unreasonable aspects of the operating system of innovative kindergartens and experienced difficulties in the work approach, they pondered how to actualize the appropriate direction of innovative kindergartens. Based on the results, implications regarding education, organizational culture, and innovative kindergarten policy were discussed, and suggestions for further research were made.

Hospitalist 제도에 대한 외과 전공의 및 전임의의 인식 조사

강정현(Jeonghyun Kang) 대한종양외과학회 2015 Korean Journal of Clinical Oncology Vol.11 No.2

중소IT기업 S/W 개발인력의 직무몰입 영향요인에 관한 연구

강정현(Kang, Juong-Hyun),정대율(Jeong, Dae-Yul) 한국산학기술학회 2012 한국산학기술학회논문지 Vol.13 No.8

본 논문의 목적은 중소 IT기업 S/W 개발자의 생산성을 높이기 위하여 어떤 요소들이 직무몰입에 긍정 또는 부정적 영향을 미치는가를 분석하는데 있다. 본 연구에서는 개발자의 직무능력을 중요한 선행변수로 보고 있다. 그리 고 역할갈등과 태도가 직무몰입을 가져오는 중요한 매개 작용을 한다는 가설에서 출발하였다. 실증자료를 통한 경로 분석 결과, 직무능력 변수들이 매개변수인 역할갈등과 태도에 영향을 미치며, 이들이 직무몰입에 직, 간접적으로 영향 을 미치는 것으로 나타났다. 특히 중요한 발견은 업무지식이 높을수록 역할갈등은 낮게 나타났으며, 업무기술력이 높 은 인력일수록 역할갈등이 더 높게 나타났다. 이는 중소 IT기업의 경우 조직 내에서 직무기술력이 우수할수록 많은 기대와 일을 시키는 것에서 기인되었다고 보아진다. 결국, IT 개발자의 업무지식을 높이고 직무에 대하여 좋은 태도 를 형성하여야 직무몰입을 높일 수 있다. The purpose of this paper is to find the factors that affect on the job involvement of S/W developer in the small and medium IT companies. We suggested structural model with two mediating variables, role conflicts and attitude of workers. The model considered job competency(job knowledge, technological competences, and communication skill) as independent variables which affect on the mediating variables directly and final dependent variable indirectly. The hypotheses tests showed that the job knowledge affected negatively on the role conflicts as the hypothesis assumed, but technological competences affected positively(reserve direction) on the role conflicts. This finding means that the more he / she has good job skill and technologies, the more does he required to do many things in the organization. The results of path analysis showed that attitude of workers mediated between the role conflicts and job involvement significantly. We concluded that although the workers are suffered from the role conflicts, it could be mitigated by their job knowledge and the favorite attitude toward their job, and finally they could more involve in their job.

초분광 영상을 이용한 토마토 모종의 수분함유량 추정

강동현 ( Dong Hyeon Kang ),유찬석 ( Chan Seok Ryu ),민영봉 ( Young Bong Min ),강정균 ( Jeong Gyune Kang ) 한국농업기계학회 2015 한국농업기계학회 학술발표논문집 Vol.20 No.2

불등풀가사리 추출물의 항산화 활성 및 조골세포 분화에 미치는 영향

강정현(Jeong Hyeon Kang),정경임(Kyung Im Jung),박미화(Mi Hwa Park),오근혜(Geun Hye Oh),김미향(Mihyang Kim) 한국식품영양과학회 2023 한국식품영양과학회지 Vol.52 No.5

본 연구에서는 불등풀가사리 추출물의 항산화 활성을 검토하고, 조골세포에 대한 분화와 골 형성에 미치는 영향을 확인하기 위하여 MC3T3-E1 세포의 증식률과 ALP의 활성 및 골 석회화 정도를 측정하고 OPN과 Runx2 및 osterix 단백질 발현 정도를 분석하였다. 불등풀가사리 추출물의 총 폴리페놀 함량을 gallic acid를 표준물질로 사용하여 측정한 결과 3.04 ㎎ GAE/g으로 나타났다. 불등풀가사리 추출물의 DPPH 라디칼 소거능은 농도 의존적으로 증가하였고(P<0.05), 1,000 ㎍/mL 농도에서 대조군과 비교하여 최대 92.41%로 나타났으며, SOD 활성은 1,000 ㎍/mL에서 54.26%로 나타났다(P<0.05). 불등풀가사리 추출물이 MC3T3-E1 조골세포의 성장에 미치는 영향을 MTT 분석법으로 확인한 결과, 100 ㎍/mL로 처리 시 123.13%로 나타나 높은 조골세포 성장률을 보였다. MC3T3-E1 조골세포에서 불등풀가사리 추출물의 농도에 따른 ALP 활성은 추출물 10 및 50 ㎍/mL 농도에서 각각 118.93%, 115.21%로 무첨가군에 비해 증가하였다(P<0.05). Alizarin Red 염색법에 의한 석회화 형성도를 현미경으로 관찰한 결과 불등풀가사리 추출물 처리에 의해 calcium spot이 많이 형성되었으며, 석회화 정도를 수치화한 결과 모든 농도에서 대조군에 비해 높은 석회화 형성능을 보였는데, 시료 50 ㎍/mL 농도에서 133.86%로 최대 활성을 보였다. MC3T3-E1 조골세포에서의 OPN과 Runx2 및 osterix 단백질 발현량은 불등풀가사리 추출물 50 ㎍/mL 농도에서 분화 대조구보다 각각 1.26배, 2.13배, 2.87배 증가하였다. 이상의 결과에서 불등풀가사리 추출물은 높은 항산화 활성을 나타내었으며, 조골세포 증식, ALP 활성, 골 석회화 형성 및 조골세포 분화 인자의 단백질 수준을 조절하여 그 발현을 증가시키는 것으로 확인되어 기능성 제품 개발을 위한 소재로써 충분한 가치가 있는 것으로 생각된다. Osteoporosis is a disease characterized by decreased bone strength, decreased bone mass, and bone deterioration. The current study investigates the effects of Gloiopeltis furcata ethanol extract (GFE) on antioxidant activity and osteoblast differentiation in MC3T3-E1 osteoblastic cells. Antioxidant activities of GFE were examined by evaluating 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging activity, superoxide dismutase (SOD) activity, and total polyphenol content. Results showed that GFE contains 3.04 ㎎ gallic acid equivalents/mL. GFE exhibited significantly strong scavenging activity in the DPPH assay, and 54.26% SOD activity was exhibited at 1,000 ㎎/mL concentration. Furthermore, GFE significantly increased the viability and proliferation of the MC3T3-E1 osteoblastic cells. Exposure to GFE promoted alkaline phosphatase (ALP) activity and mineralized nodules in MC3T3-E1 cells. Moreover, a dose-dependent increase in the expression of proteins associated with osteoblast growth and differentiation, such as Runx2, ALP, and osterix, was observed in the GFE-treated cells. Taken together, these results indicate that GFE encompasses both antioxidant potential and osteoblast differentiation properties. Thus, we conclude that GFE can potentially be applied as an alternate therapy for the prevention and treatment of osteoporosis.

장애인 재활승마의 치료 효과에 관한 문헌 고찰

강정현(Kang, Jung-Hyun),유병인(Yoo, Byung-In),이용상(Lee, Yong-Sang) 한국웰니스학회 2007 한국웰니스학회지 Vol.2 No.1