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가토 두개골 결손부에서의 혈소판풍부혈장(PRP)과 혈소판풍부피브린(PRF)의 골형성 증진 효과
이덕원 ( Deok Won Lee ),김규태 ( Kyu Tae Kim ),류동목 ( Dong Mok Ryu ),지유진 ( Yu Jin Jee ) 한국조직공학·재생의학회 2009 조직공학과 재생의학 Vol.6 No.4
To evaluate the effect of platelet rich plasma(PRP) and platelet rich fibrin(PRF) on bone defects with autogenous bone graft and control(no treatment) in the same rabbit calvaria. Four rabbits were included in prospective study. In each rabbit, four equal 8 mm diameter cranial bone defects were made with trephine drill and it was immediately grafted with PRP, PRF, autogenous bone and one defect was remained with no treatment(control). The defects were evaluated by cone beam CT at 2, 4, 6 and 8 weeks. At 8 weeks, rabbits were sacrificed. Soft X-ray with step-wedge calibration and histologic process were taken with sacrificed rabbits for radiomorphometric and histomorphometric analysis. Radiomorphometrically and histomorphometrically, the results showed a significant increase in bone formation on autogenous bone graft group. Both PRP and PRF groups showed significant increase as compared with the control group. There was no significant difference between PRP group and PRF group. Significant improved bone formation was seen with the addition of PRP or PRF on non-critical sized defects in the rabbit cranial model. And PRF group showed more uniform and similar result compared with PRP group. It is reasonable to think that PRP and PRF can promote bone regeneration. Also, PRF can replace PRP according to good uniform result and simple manipulation.
초등학교 음악전담 교사들의 갈등 구조에 관한 근거이론 연구
권덕원 ( Kwon Doug Won ),석문주 ( Seog Moon Joo ),이지현 ( Lee Ji Hyun ),이해심 ( Lee Hae Sim ) 미래음악교육학회 2020 미래음악교육연구 Vol.5 No.3
본 연구의 목적은 근거이론 연구방법론을 따라, 초등학교 음악전담 교사들과의 면담을 토대로, 그들의 교육에 영향을 주는 요인들을 수집하여 분석하고, 음악전담 교사로서의 갈등 구조에 관한 작은 이론을 도출하는 데 있다. 연구 참여자들은 1차 면담에 14명, 2차 면담에 6명, 그리고 3차 면담에 7명이 참여하였다. 1차 면담은 대면으로 진행하였고, 2차와 3차 면담은 비대면으로 진행하였다. 수집한 데이터에 대해서는 글레이저 방법론을 따라 개방코딩, 선택코딩, 이론적 코딩의 순서로 하였으며, “지속적 비교”와 “포화”를 주요한 방법으로 삼았다. 수집한 데이터에서 출현한 패턴, 개념, 속성, 범주들을 정리하고 상호 관련성을 기준으로 체계화한 결과, 가장 핵심적인 범주는 “음악전담 교사들의 갈등 구조”로 나타났다. 그 핵심범주를 중심으로 두 가지의 개념적 가설을 얻을 수 있었다. 첫째는, 음악전담 교사들은 음악전담 지속동기와 걸림돌요인 사이에서 갈등을 겪고 있으며, 그 갈등의 결과는 “음악전담 지속” 또는 “음악전담 회피”로 나타난다는 것이었다. 그리고 둘째는 지속동기가 강한 교사는 음악전담 교사를 선택하는 경향이 높은 반면, 지속동기가 약하거나 걸림돌요인으로 어려움을 느끼는 정도가 심한 교사들은 음악전담 교사를 포기하고 학급담임 교사를 선택하는 경향이 높다는 것이었다. 초등학교에서 음악교육 수준의 향상을 위하여 노력하고 있는 음악전담 교사들은 지속동기와 걸림돌 요인들 사이에서 끊임없이 갈등을 겪고 있다. 그들이 겪고 있는 갈등을 동료와 같은 마음으로 함께 이해하고, 우리가 지금 바로 할 수 있는 것으로 그들의 어려움을 배려해 준다면, 그들이 음악전담을 지속하려는 판단에 긍정적인 도움을 줄 수 있을 것이다. The purpose of this study is to collect data from interviews of elementary music teachers, to analyze the data, and to generate theories about the structure of their conflict based on the method of grounded theory. We, researchers interviewed 27 music teachers. Some of them(14 teachers) were interviewed in tact, the others(13 teachers) were in untact. We implemented open coding, selective coding, theoretical coding, “constant comparison,” and “saturation,” following Glaser’s theoretical position. We gained a wide concept, “the structure of elementary music teachers’ conflict,” as a core category. And two small theories were generated based on the core category. First, elementary music teachers are undergoing inner conflicts between positive motivations and obstacle factors in terms of continuing to be music teachers in schools. And the result is whether they choose to be music teachers in the next year or to be classroom teachers. Second, teachers who have strong positive motivations show tendencies of choosing to be music teachers, but teachers who have weak motivations and perceive obstacle factors as big problems show tendencies of choosing to be classroom teachers. When we try to understand the conflicts of elementary music teachers as good peers, and considerate them thoughtfully with something that we can do right now, the music teachers would concentrate more on the positive motivations in the decision making for continuing to be music teachers.
호텔 직원이 지각한 권력이 집단응집성과 조직몰입에 미치는 영향
이덕원 ( Lee Duk-won ) 한국호텔리조트학회(구 한국호텔리조트카지노산학학회) 2018 호텔리조트연구 Vol.17 No.2
This study is to investigate the effect of power on group cohesivenss and organizational commitment of hotel employees and the purpose of investigating the providing directions for hotel employees to have a consistent to promote satisfaction with organizational involvement. For this study a questionnaire survey, targeting hotel employees with more than 1 year experience in domestic special first class hotel with top 10 hotels of in 2016 customer satisfaction index, was made during 8 weeks period, total 350 sheets were distributed and 312 samples were used for the empirical analysis. The according to the empirical analysis result, Power was defined by five factors derived from exploratory factor analysis: reward power, coercive power, legitimate power, expert power and referent power. two sub-factors of power, reward power had a positive(+) effect and coercive power had a negative(-) effect on group cohesivenss. Second, reward power, referent power had a positive(+) effect on organizational commitment.
마이크로 가공시스템을 위한 로딩-언로딩 매니퓰레이터 개발
윤덕원(Deok-won Yun),신동익(Dong-ik Shin),김진호(Jin-ho Kim),한창수(Chang-soo Han),이낙규(Nak-kyu Lee),이혜진(Hye-jin Lee) 한국생산제조학회 2007 한국공작기계학회 춘계학술대회논문집 Vol.2007 No.-
In this paper we present a 3-DOF manipulator of which task is to unload the product from a micro factory. The micro factory developed by KITECH presses sheet metal to produce a micro valve that is used for micro pump. Our research is focused on the development of a small-sized unloading manipulator which works in the narrow workspace between the dies. We have implemented pick-and-place task with vacuum pressure and 3-DOF motion with stepping motors. We present the design procedures and analysis required in each module.
이덕원(Deok-Won Lee),이현우(Hyun-Woo Lee),권용대(Yong-Dae Kwon) 대한치과의사협회 2014 대한치과의사협회지 Vol.52 No.4
Bisphosphonates are widely used in the treatment of many medical conditions, such as osteoporosis, multiple myeloma, Paget’s disease, etc. However, side effect has been documented in the published data during the past years, osteonecrosis of the jaw in patients receiving long-term bisphosphonate therapy. Although pathogenesis of BRONJ(bisphophonate-related osteonecrosis of the jaw) is not yet fully understood, it is currently known to be a disease associated with suppressed bone turnover by bisphophonate. Recent literature has indicated a similar association with nonbisphosphonate drugs used in cancer therapy including monoclonal antibodies denosumab and bevacizumab and multikinase inhibitor sunitinib. Accordingly, many studies have been carried out on the biochemical markers examination to assess the risk for BRONJ. The treatment of BRONJ is reported with a review of the relevant literature. However, there is still a controversial discussion about the adequate treatment. It is necessary to accumulate further studies in order to establish more useful biochemical markers and effective treatment for BRONJ.
순응형 파지와 정밀한 집기가 가능한 유연한 그리퍼의 강도 및 강성 분석
이덕원(Deok Won Lee),전형석(Hyeong Seok Jeon),정용준(Young Jun Jeong),김용재(Yong Jae Kim) 제어로봇시스템학회 2016 제어·로봇·시스템학회 논문지 Vol.22 No.10
In this paper, we introduce a flexible gripper that we have engineered to precisely pinch in parallel and compliantly grasp objects. As found in most conventional industrial grippers, the parallel pinching property is essential for precise manipulation. On the other hand, the grippers with a flexible structure are more adept at grasping objects with arbitrary shapes and softness. To achieve these disparate properties, we introduce a flexible gripper mechanism composed of multiple flexible beam structures. Utilizing these beam structures, the proposed gripper is able to grasp arbitrarily shaped objects. Additionally, a unique combination of flexible beams enables the gripper to pinch objects using the parallel fingertips for enhanced precision. A detailed description of the proposed mechanism is provided, and an analysis of the strength and stiffness of the fingertip and finger body is presented. The Results section compares the theoretical and experimental analyses and verifies the properties and performance of the proposed gripper.
고분해능 전자현미경법을 이용한 (Bi, La)<sub>4</sub>Ti<sub>3</sub>O<sub>12</sub> 박막의 결정학적 특성 평가
이덕원,양준모,박태수,김남경,염승진,박주철,이순영,박성욱,Lee, Doek-Won,Yang, Jun-Mo,Park, Tae-Su,Kim, Nam-Kyung,Yeom, Seung-Jin,Park, Ju-Chul,Lee, Soun-Young,Park, Sung-Wook 한국재료학회 2003 한국재료학회지 Vol.13 No.7
The crystallographic characteristics of the $(Bi, La)_4$$Ti_3$$O_{12}$ thin film, which is considered as an applicable dielectrics in the ferroelectric RAM device due to a low crystallization temperature and a good fatigue property, were investigated at the atomic scale by high resolution transmission electron microscopy and the high resolution Z-contrast technique. The analysis showed that a (00c) preferred orientation and a crystallization of the film were enhanced with the diffraction intensity increase of the (006) and (008) plane as the annealing temperature increased. It indicated a change of the atomic arrangement in the (00c) plane. Stacking faults on the (00c) plane were also observed. Through the comparison of the high-resolution Z-contrast image and the $Bi_4$$Ti_3$$O_{12}$ atomic model, it was evaluated that the intensity of the Bi atom was different according to the atomic plane, and it was attributed to a substitution of La atom for Bi at the specific atom position.
자가혈액에서 농축한 골유도성장인자의 임상응용과 개발의 최근동향
이덕원 ( Deok Won Lee ),지유진 ( Yu Jin Jee ) 한국조직공학과 재생의학회 2009 조직공학과 재생의학 Vol.6 No.1
골 형성을촉진하는 물질로는 골유도단백(BMP), 혈소판 유래 성장인자(PDGF), 형질 전환 성장인자(TGF-β) 등의 다양한 골 형성 기질 등이 있다. 이러한 성장인자는 치유 과정시 조직의 재생에 필수적인 신생혈관의 형성, 세포의 화학주성 및 분열촉진, 간세포 증식, 기질합성 등을 조절하는 인자로 조직재생에 기여한다. 최근 조직공학 연구가 발전하면서 이러한 국소적 역할을 하는 성장요소들에 대하여 활발히 연구되고 있다. 이러한노력 중 하나가 혈액내 혈소판에 존재하는 여러 성장인자를 임상적으로 이용하고자 혈소판을 농축하여 적용하는 혈소판풍부혈장(PRP)과 혈소판풍부 피브린(PRF) 이다 . PRP와 PRF는 방법의 용이성과 효능면에서 많은 장점을 가지고 있기에 이에 대한 관심과 연구가 지속되고 있다. 하지만 아직 임상적 적용에 대하여 학문적 고찰과 개선이 필요하므로 이에 대한 문헌고찰과 최근의 연구를 살펴보고자 한다.