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생체분해성 고분자를 이용한 사시수술용 제형개발 및 효용성에 대한 연구
민병무,김용백,김승영,김창식,박근성,길숙종,조항진,이성복,노승무,송규상,강대영,조준식,양준묵,정경수,최선웅,이진호,김학용,인현빈 충남대학교 의과대학 지역사회의학연구소 1998 충남의대잡지 Vol.25 No.1
A new device, muscle clamping system was developed to facilitate exact quatifying technique A strabismus surgery, and reduce the risk of complications. The device is composed of a lower fixing body with three jaws and an upper supporting body. They are used to clip an extraocular muscle and fix it to the sclera with a single bite. Superior rectus recession on 16 rabbit eyes were performed with this new device. Conjunctival injection, muscle adhesion strength, and light microscopic findings were examined at 1, 2, 4 and 8 weeks postoperatively. The Conjunctival injection were minimal, adhesion power ranged from 420 to 600 gram gravity, which is sufficient in withstand the normal pull of human extraocular muscle. In microscopic exam, some Inflammatory cells and fibrosis were found. The new device was technically easy, fast, and accurate, so it may be useful in stabismus surgery.
생체분해성 망막압정을 이용한 망막고정에 대한 실험적 연구
김용백,민병무,김창식,박근성,김승영,길숙종,조항진,이성복,노승무,송규상,강대영,조준식,양준묵,정경수,최선웅,이진호,김학용,인현빈 충남대학교 의과대학 지역사회의학연구소 1998 충남의대잡지 Vol.25 No.1
Biodegradable retinal fixation devices obtain mechnical fixation of the retina with desirable chorioretinal scarring and with the potential for local, sustained release of antimetabolites and steroids to inhibit proliferative vitreoretinopathy. We manufactured a biodegradable retinal tack with barb that was designed in order to prevent intrusion from implantation of retinal tacks. This study was carried to evaluate the efficacy for retinal fixation and the capability for sustained release of drugs with a newly designed biodegradable retinal tack Biodegradable retinal tacks were made of polymers of glycolic acids and were designed with barbs in a shape to prevent the disinsertion. Biodegradale retinal tacks are divided into 3 parts, a conical portion that is inserted into the sclera, a cylinder portion that remains in the vitreous, and a neck portion between the pin and the cylinder. The tapered conical end was manufactured to allow easy insertion through the retina and choroid into the sclera. A cylinder portion was manufactured with a tapered angle that fixes firmly into the orifice of 19 gauge spinal needle. A neck portion, 0.4 mm in diameter, was designed to prevent disinsertion from following implantation of retinal tack. The applicator was a 19 gauge spinal needle and its orifice was prepared to 15°angle to accept the tapered cylinder portion of the retinal tack. The retinal tacks, secured in the needles, were passed through the formed vitreous and inserted into the retina, choroid, and sclera and were released by pushing the internal needle, usually within 2-3mm of the medullary ray of the posterior rabbit retina A retinal tack was placed in each of 8 pigmented rabbit eyes. Slit-lamp biomicroscopy, indirect ophthalmoscopy and fundus photography were performed periodically from 1 day to 8 weeks after surgery. Eight eyes were enucleated and studied by light microscopy at 8 weeks. Biomicroscopic evaluation of the animals revealed edemas adjacent to the retinal surfaces immediately after insertion of the biodegradable retinal tacks in all the animals. These edemas disappeared after 1 week. The first noticeable change in the size of retinal tacks was shown after 2weeks. The size of the retinal tacks gradually got smaller, decreasing to about one-half at 4 weeks and about one-third at 8 weeks. All retinal tacks remained in inserted places without any movement for an 8 week period. On light microscopy, epiretinal proliferations were seen to extend into the vitreous cavity. Cellular capsules that lined the inner aspect of the scleral defect caused by tack insertion were found. However the adjacent retina had a normal cytologic appearance and architecture in all specimens. We manufactured a biodegradable retinal tack that is designed to prevent intrusion from implantation of retinal tacks. All biodegradable retinal tacks reduce in size with time, but no retinal tacks extruded from the inserted place. The newly designed biodegradable retinal tack can be used for retinal fixation and may be used as a vehicle for the introduction of pharmacologic agents to prevent the cellular events that promote proliferative vitreoretinopathy.
Design of Real-Time Autonomic Nervous System Evaluation System Using Heart Instantaneous Frequency
Noh, Yeon-Sik,Park, Sung-Jun,Park, Sung-Bin,Yoon, Hyung-Ro The Korean Institute of Electrical Engineers 2008 Journal of Electrical Engineering & Technology Vol.3 No.4
In this study, we attempt to design a real-time autonomic nervous system(ANS) evaluation system usable during exercise using heart instantaneous frequency(HIF). Although heart rate variability(HRV) is considered to be a representative signal widely used ANS evaluation system, the R-peak detection process must be included to obtain an HRV signal, which involves a high sampling frequency and interpolation process. In particular, it cannot accurately evaluate the ANS using HRV signals during exercise because it is difficult to detect the R-peak of electrocardiogram(ECG) signals with exposure to many noises during exercise. Therefore, in this study, we develop the ground for a system that can analyze an ANS in real-time by using the HIF signal circumventing the problem of the HRV signal during exercise. First, we compare the HRV and HIF signals in order to prove that the HIF signal is more efficient for ANS analysis than HRV signals during exercise. Further, we performed real-time ANS analysis using HIF and confirmed that the exerciser's ANS variation experiences massive surges at points of acceleration and deceleration of the treadmill(similar to HRV).
DLP 방식의 3D 프린터로 제작된 임시 보철물의 변연 및 내면 정확도 평가
Mi-Jun Noh,Ha-Bin Lee,Ji-Hwan Kim 대한치과기공학회 2022 대한치과기공학회지 Vol.44 No.2
Purpose: The aim of this study was to evaluate the accuracy of provisional crowns manu-factured using a milling machine and a digital light processing (DLP) printer. Methods: A full-contour crown was designed using computer-aided design software. Provi-sional crowns of this design were manufactured using a milling machine and using a DLP three-dimensional (3D) printer (N=20). The provisional crowns were digitized with an extra-oral scanner, and 3D deviation analysis was applied to the scanned data to confirm their accuracy. An independent t-test was performed to detect the significant differences, and the Kolmogorov-Smirnov test was used for analysis (α=0.05). Results: No significant differences were found among the precision of marginal surface be-tween the printed and milled crowns (p=0.181). The trueness of marginal and internal sur-faces of the milled crowns were statistically higher than those of the printed crowns (p=0.024, p=0.001; respectively). Conclusion: The accuracy of provisional crowns manufactured using a milling machine and a 3D printer differed significantly except with regards to the precision of the internal sur-face. However, all the crowns were clinically acceptable, regardless of the manufacturing method used.
Design of Real-Time Autonomic Nervous System Evaluation System Using Heart Instantaneous Frequency
Yeon-Sik Noh,Sung-Jun Park,Sung-Bin Park,Hyung-Ro Yoon 대한전기학회 2008 Journal of Electrical Engineering & Technology Vol.3 No.4
In this study, we attempt to design a real-time autonomic nervous system (ANS) evaluation system usable during exercise using heart instantaneous frequency (HIF). Although heart rate variability (HRV) is considered to be a representative signal widely used ANS evaluation system, the R-peak detection process must be included to obtain an HRV signal, which involves a high sampling frequency and interpolation process. In particular, it cannot accurately evaluate the ANS using HRV signals during exercise because it is difficult to detect the R-peak of electrocardiogram (ECG) signals with exposure to many noises during exercise. Therefore, in this study, we develop the ground for a system that can analyze an ANS in real-time by using the HIF signal circumventing the problem of the HRV signal during exercise. First, we compare the HRV and HIF signals in order to prove that the HIF signal is more efficient for ANS analysis than HRV signals during exercise. Further, we performed real-time ANS analysis using H1F and confirmed that the exerciser's ANS variation experiences massive surges at points of acceleration and deceleration of the treadmill (similar to HRV).
플랜트 초기 개념설계를 위한 에너지 효율 모델링&시뮬레이션에 관한 연구
전찬모(Chan Mo Jun),이혜연(Hye Yun Lee),Wen-Bin Zhao,노상도(Sang Do Noh),조현제(Hyun Jei Jo),조용주(Yong Ju Jo) (사)한국CDE학회 2012 한국 CAD/CAM 학회 학술발표회 논문집 Vol.2012 No.2
환경에 대한 사회적 요구가 높아짐에 따라 온실가스 절감과 오염물질 배출 방지 대책 등에 대한 제조기업의 사회적 노력이 요구되고 있다. 이를 위해 플랜트 엔지니어링 분야에서도 그린빌딩, 지속 가능성을 고려한 연구가 활발하게 수행되고 있다. 그러나 많은 연구가 운영 측면의 최적화, 플랜트 내부 설비의 성능 개선에 중점을 두고 있을 뿐 플랜트의 설계 단계에서부터 최종 폐기단계까지 엔지니어링 전주기를 고려한 온실가스 배출, 에너지 분석 등은 수행되지 못한 실정이다. 본 논문에서는 플랜트의 에너지 효율 및 지속가능성을 평가하기 위한 시뮬레이션 프로그램의 개발을 목표로 한다. 이를 위해 기존의 플랜트 엔지니어링 프로세스에 대한 현행 모델 분석하고 최적의 시뮬레이션 위치 및 지속가능성을 평가하기 위한 요소를 도출해 지속가능성 라이브러리를 구성하고 구성된 라이브러리를 바탕으로 플랜트 구조물의 에너지 효율 분석 모델을 생성하고 지속가능성과 에너지 효율을 분석할 수 있는 시뮬레이션 기술을 구현하였다.