Three-Dimensional Z-Plasty(Yoon's Method)를 이용한 내안각 췌피 성형술

박흥식,김우신,윤진호,나민화,김한중 대한미용성형외과학회 1997 Archives of Aesthetic Plastic Surgery Vol.3 No.1

The presence of epicanthal folds in Asian eyelids is one of their unique features, in combination with the lack of supratarsal folds. Western culture has influenced many people to prefer to eliminate the prominent epicanthal fold. A number of surgical techniques have been suggested for their correction. However, difficulty with design, excessive and prominent scarring of medial canthal and nasal area, recurrence, and rigidity of application are potential problems associated with many procedures. This paper describes a epicanthoplasty with three-dimensional Z-plasty. Through epicanthal fold incision, the medial canthal tendon is medially advanced and sutured to the periosteum of nasal bone. After the transposition of the flaps, trimming of the flap is usually required. Three-dimensional Z-plasty creates the attractive eyes. From March, 1995 to March, 1997, the technique was applied to 37 patients with epicanthal fold and was performed with or without double-fold operation. There were 34 females and 3 males with ages ranging from 17 to 30 years. Through 2 years follow-up, this technique has delivered esthetically good results with minimal postoperative scar and could made the reduction of ICD from 40 ± 2.13 mm to 34 ± 1.98 mm. The advantages of epicanthoplasty procedure using three-dimensional Z-plasty(Yoon's method) are as follows; 1) simple in design 2)minimal postoperative scar in the medial canthal area 3) versatile in its application 4) no recurrence 5) no hypertrophic scar 6) preserving ethnic identity.

Power Quality 向上을 위한 Wavelet Transform을 利用한 高調波 除去 技法에 관한 硏究

박성원,백진욱,강승호,김철환 成均館大學校 科學技術硏究所 1998 論文集 Vol.49 No.1

In recent years, electric power quality(PQ) has become an important issue in power systems. This is due to the fact that the usage of power electronics equipments and electronic-based loads which are sensitive to power quality disturbances has been increased. and thus normal operations in industrial and commercial facilities are becoming more vulnerable to the electric power quality disturbances. For improvement of power quality, this thesis presents a new approach to cancel the harmonic of canons types of lest is power quality disturbances using discrete wavelet transforms. This method is io decompose a given disturbance signal into other signals which represent a smoothed version and a detailed version of the original signal. The decomposition is performed using multiesolution signal decomposition techniques. The result shows that the discrete wavelet transform was able to detedct the electric power quality disturbances and to remove the harmonic of electric power quality disturbances.

악교정 수술후 발생한 감염 4증례

진병로,김종섭,박진호,이창곤,박희대,이희경 大韓顎顔面成形再建外科學會 1995 Maxillofacial Plastic Reconstructive Surgery Vol.17 No.1

Postoperative infection following orthognatic surgery is rare. When postoperative infections occur, the initial treatment consists of incision and drainage of the affected area, culturing to identify bacterial stains and verify antibiotic sensitivity, and the institution of the appropriate antibiotic regimen. Some plates and screws may eventually require removal, the initial therapy should be attempted to retain the plates and screws until adequete healing has taken place. In orthoganthic surgery, intra-operative complications as a lesion of inferior alveolar nerve, fracture of osteomised segments, incomplete sectioning, malposittion of segments, haemirrhage may occur. The surgeon should be familiar with possible complications to be caused and how to manage them. Prevention of postoperative infection following the orthognathic surgery consists of minimal periosteal reflection, aseptic management of operation field, proper surgical technique, rigid fixation, prophylactic antibiotics.

저온에서의 자연철의 Mo¨ssbauer Spectra 硏究

朴冠鎬,李敬行,金振璜 동국대학교 1985 論文集 Vol.24 No.-

Mo¨ssbauer parameters of natural iron have been measured from 25K to 298K. The isomer shift was not linear with absolute temperature, except at high temperature, because of quantized lattice levels. We have obtained the Debye and einstein temperature by fitting the kinetic temperature proposed by Mazo and Kirwood. We have found out the following results; 1) Isomer shift values tend to increase, while temperature decrease. 2) Hyperfine splitting values tend to increase, while temperature decrease. 3) Debye temperature is 264 K. 4) Einstein temperature is 202 K.

백서 좌골신경의 압좌상과 절제에 따른 말초신경 재생의 비교

박노부,김진수,김호석 大韓顎顔面成形再建外科學會 1995 Maxillofacial Plastic Reconstructive Surgery Vol.17 No.1

The purpose of this experimental study was to examine and compare the regeneration capacity between crushed nerve & transected nerve. For this study, 20 Sprague-Dawley female albino rats were used as experimental animals and divided into two groups. In group 1, the sciatic nerves were crushed 6mm. in length for 1 min. using maximum force with a needle holder. In group 2, the sciatic nerves were resected 6mm. in length and the gaps were encased by inserting the proximal and distal stumps into each end of silicone tubes. The animals were sacrificed 1 month & 2 months after the experiment. All specimens were fixed in 2.5% glutaraldehyde and 1% Osmium tetroxide solution then embedded in epon 812 and were cross-sectioned at 1 ㎛. After these procedures, specimens were observed under Light microscope. The results obtained were as follows. 1. Group 1 showed greter diameters of regenerating nerves than group 2. 2. Group 1 showed greater number of axons than group 2.

급성 내피손상을 받은 백서 대퇴정맥에서 냉동요법의 효과

박흥식,윤진호,김한중,나민화 大韓成形外科學會 1999 Archives of Plastic Surgery Vol.26 No.5

In the case of crush injury, the failure rate of replantation of free tissue transfer is high. Recently, the freezing of intact and repaired microarteries has been known to relieve spasm without inducing thrombosis in vivo. Therefore, the author thought that the vascular freezing of crushed vein showing only unrecognized endothelial damage after adequate debridement of a damaged vessel can also relieve spasm without inducing thrombosis and improve the patency rate of microvascular anastomosis. In this study, the process of vascular freezing was investigated in veins with acutely damaged endothelium using ethly chloride in a rat model. Two experiments were performed in 30 Sprague-Dawley rats, weighing about 250 gm. In the first experiment, a new crush model was established on the femoral vein of the rats. The degree of vessel injury was evaluated as crush energy. The proper crush energy was determined only by the endothelial damage without inducing thrombosis(0.037 J). In the second experiment, femoral veins were crushed with the energy of 0.037 J on the left side and then frozen after inflicted crush injury with the same energy on the right side. The gross and pathologic findings and patency rates were observed at postoperative day 2, 10 and 30. Patency in both the crushed and crush-freezing group was 100%. Pathlolgic findings in the crush-freezing group were more severe loss of the intima and most parts of the media, as well as cellular depopulation of the media when compared to the crushed group. Microthrombi adherent to the wall were demonstrated in several crush-freezing specimens, but the crush-freezing group showed relief of crush-induced vasopasm and endothelial regeneration. In conclusion, the freezing of microveins with acute endothelial damage relieves spasm without inducing thrombosis. Therefore, this study presents the posslbility of clinical application of vascular freezing in a case of crush injury requiring microvascualr anastomosis.

電氣工學敎育의 發展方向에 關한 硏究

李鎭局,徐相壽,朴魯峰,李忠鎬,劉鍾哲,金洪奎,趙武濟,韓運東,池平植 충주대 2003 産業科學論文集 Vol.11 No.-

In this paper, we discuss actual conditions for running school of electrical and electronic engineering in domestic universities. Also, we catch hold of industrial circles's demands in electrical engineering education and analyze questionary results according to goes into effect school of electrical and electronic & information engineering in major of electrical and electronec engineering's students. Conclusively, we present suitable model in electrical engineering by correction of problems.

현무암 석분 활용에 대한 연구

민경원,진호일,최성범,박진동 강원대학교 부설 석재복합신소재 제품연구센터 2002 석재연 논문집 Vol.7 No.-

철원지역에서 발생되는 현무암 석분은 주로 휘석과 사장석, 방해석, K-장석 등으로 구성되어 있고 건조한 상태에서 회색을 띄며 참비중은 2.86이고 94 vol.%이상이 미사질이나 모래질 입도로 이루어져 있다. 현무암 석분은 pH 8.3인 약알카리성으로서 중금속 용출시험 결과 환경보전법에서 설정한 Cu, Pb, Zn, Cd, Cr, As, Hg 등 6가지의 중금속 원소가 모두 기준값 이하의 낮은 용출 함량을 보여 농지개량을 위한 객토용으로서의 충분한 이용 가능성을 나타내었다. 현무암 석분은 광물학적 및 물리적·화학적 특성과 폐기물인 석분을 다량 소모시키면서 2차적인 석폐기물을 발생시키지 않아야 한다는 점등을 고려할 때, 결합재의 배합비를 석분에 대한 무게비로 대략 45∼50wt% 정도로 하여 폴리머 복합소재를 이용한 캐스트 제품을 만들어 상품화하는 것이 바람직할 것으로 판단되며, 이를 위해서는 지역 특성에 맞는 다양한 캐릭터 및 몰드 제작은 물론 캐스트용 제품의 고기능화에 대한 지속적인 연구가 요구된다. The sludges mostly of silt or sand size grains (above 94 vol.%) from the Cheolwon district are mainly composed of pyroxene, plagioclase, calcite and K-feldspar, and showed gray colors in dried state. Their true specific gravities and pH's are 2.86 and 8.3, respectively. The sludges from the Cheolwom district have less leached contents of six heavy metals (Cu, Pb, Zn, Cd, Cr, As and Hg) than those of standard levels established in the Soil Environment Conservation Regulation, which impliess that the sludges can be utilized as modifier of soil nature. In consideration of mineralogical, physical and chemical properties and effects of consuming the basalt sludges without secondary stone wastes, some character products had been developed by utilizing the basalt powder sludges with adding binder (unsaturated polyester resin) in 45∼50wt%. Further studies on development of regional character, commercialization of cast products, manufacture of mold and etc. are recommended for more effective utilization of basalt powder sludges.

Raman 분광법에 의한 Ⅲ족 Nitride OMVPE 전구체들의 열분해에 관한 연구

이순애,박진호 영남대학교 공업기술연구소 2000 工業技術硏究所論文集 Vol.28 No.1

The homogeneous gas phase decomposition of TMGa and NH3 in an inverted, vertical cold-wall reactor was studied in-situ by Raman spectroscopy. Pure rotational Raman scattering from the carrier gas(N2) was used to determine the temperature variations in the reactor, and the vibrational Raman spectra of the precursor molecules were used to measure species concentration profiles. It was found that the pyrolysis of TMIn, TMGa and NH3 in a N2 environment is initiated above 493K, 623K and 673K, respectively, and the temperature ranges over which pyrolysis occurs were wider than previously reported using an isothermal flow tube apparatus.

염풍화에 의한 석재 구조물의 부식에 관한 연구

민경원,진호일,박진동 강원대학교 부설 석재복합신소재 제품연구센터 2003 석재연 논문집 Vol.8 No.-

염의 결정, 수화 및 열팽창에 의한 암석의 풍화는 암석 파괴의 주요 원인으로 알려져 있다. 도시환경에서도로와 보도에 과다하게 뿌려지는 NaCl, CaCI₂ 등의 제설제와 해무에 의하여 내륙으로 이동된 바다의 염은 석조 문화재, 건물 및 콘크리트 구조물의 손상을 일으키게 된다. 신선한 화강암, 풍화된 화강암 및 저품위의 석회암을 대상으로 염의 과포화 수용액에 암석시료를 일정시간을 침수시킨 후 건조시키는 과정을 반복하는 인공염풍화 실험을 실시하였다. 매회 시험 후 측정한 암석시료의 초음파 전파속도가 일정한 첫수의 반복시험 후에는 거의 일정한 값을 보이므로 반복된 시험으로 암석내의 공극이 염의 결정으로 포화되었음을 유추할 수 있다. NaCl염이 CaCl₂염에 비해 상대적으로 암석에 더 큰 손상을 입히며, 흡수율이 높고 조립의 화강암이 석회암에 비해 쉽게 파괴되었다. NaCl에 의한 염풍화 시험을 반복함에 따라 암석시료의 초음파 전파속도는 점차 감소하는 경향을 보이나, 자연 풍화로 암석입자의 상호 결합력이 낮아진 풍화 화강암 시료의 경우, 초기 실험 중에는 암석입자 간의 공극에 염분 결정이 침전되어 초음파 전파속도가 증가되었다. 염풍화는 석재구조물의 손상의 주요 요인으로 석조 문화재 및 건물의 적절한 보존을 위하여 향후 계속적인 연구가 요구된다. The weathering of rocks by salt crystallization salt hydration and thermal expansion of salt has been recognized as one of powerful causes of rock disintegration. In urban circumstances, deicing salts such as NaCl and CaC1₂ introduced unnecessarily large quantities onto walks and driveways have done severe damage to stone and concrete near ground level. Salts from sea spray may be carried inland and infiltrate stones to cause the decay of stone monuments and buildings. Fresh and slightly weathered granites and low-grade limestones were selected and prepared for artificial salt weathering tests with NaCl and CaC1₂salts. After certain repeated cycles of immersion in supersaturated salt solutions and drying, the ultrasonic velocities through the tested rock specimens become nearly constant which implies that the pores be saturated with salts. NaCl salt does lead more deterioration of rocks than CaC1₂ salt and coarser grained granites with higher absorption especially when weathered, are more easily damaged by salt crystallization than limestones. Generally the ultrasonic velocities through the rock specimens show decreasing trends with repeated cycles of NaCl-test, but for the originally weathered sample, those show a increasing trend in early cycles probably resulted from precitation of salt crystals in rock pores. Conclusively, salt weathering would be an important destructive factor in stone materials and therefore, it is essential to understand salt weathering thoroughly for proper conservation of stone monuments and buildings.