http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
성기완,길남규,신석우,민택기 충남대학교 산업기술연구소 2000 산업기술연구논문집 Vol.15 No.1
This study dealt with the mechanical properties of aluminum alloy A5083 friction welds contained upset length, tensile test, hardness test, observation of microstructure and tensile fractured surface. The welding conditions of the maximum tensile strength of friction weld were revolution 2000rpm, friction pressure 50MPa, upset pressure 110MPa, friction time 1.0sec, and upset time 6.0sec. This study came to these conclusion as follow : 1.The maximum tensile strength was 355MPa which was 102% of the tensile strength 348MPa of the base material. 2.The conditions when maximum tensile strength was acquired, occurred dimple on the tensile fracture surface and upset length was 4.9mm. 3.The maximum hardness was Hv89 in the weld interface and soft zone was confirmed on the heat affected zone(HAZ).
요부수핵탈출증에서 Thermography의 진단적 가치
신현택,신승우,송재철,정석희,이종수,김성수,신현대 경희대학교 동서의학연구소 2001 東西醫學硏究所 論文集 Vol.2000 No.-
Objectives : Lumbar radiculopathy is a common disease in oriental rehabilitation medicine. It can be diagnosed by physical examination, plain X-ray, Myelography, CT, MRI, EMG etc. But those methods are not useful in observing the clinical procedure. Objectvie evaluating the clinical procedure is very important in treatment of lumbar radiculopathy. Mehthods : We studied the clinical efficacy of thermography in lumbar radiculopathy during conservative managements. We studied 36 patients with lumbar radiculopathy convinced by MRI. The had low back pain and radiating pain on one side. Thermography had taken before an after 4 weeks treatments, and compared with clinical procedure Results and conclusions : Thermography is not pertinent as a primary diagnostic method in lumbar radiculopathy, but useful in observing the clinical procedure. And it can be recommended as a objective evaluation for lumbar radiculopathy.
Hodge operator 와 Riemannian Submersion에 關하여
張澤相 群山大學校 1983 論文集 Vol.5 No.-
Mⁿ을 n 次元 Riemann 多樣體라 하고 內部微分과 그의 adjoint를 각각 d와 d*로 표시하며 △를 Hodge의 operator라 하자. 本稿에서는 Hodge operator가 submersion과 可換하기 위한 必充條件을 살피고 몇가지 성질들을 考察하였다.
張澤相 群山大學校 1982 論文集 Vol.3 No.-
기본군 Π(X, x), H-space와 map deg, exponential map등의 몇가지 성질을 이용하여 n ≥2 일 때 S1과 S2은 same homotopy type이 아님을 밝히고 (Cor11) 대수학의 기본정리를 기본군을 이용하여 증명 (Theo13) 하였다.
유치열에서 scissors bite의 치료에 대한 증례보고 : CASE REPORT
문성권,김정욱,이상훈,한세현,장기택 大韓小兒齒科學會 2006 大韓小兒齒科學會誌 Vol.33 No.2
중심교합위 상태에서 편측이나 양측으로 구치부의 상악치아가 하악치아의 협측으로 위치한 경우를 scissors bite라고 한다. 이런 부정교합은 상악의 폭이 크거나 하악의 폭이 좁은 경우 발생한다. 이로 인해 턱의 성장이 방해를 받고 악궁간 부조화를 유발하며 적절한 저작을 할 수 없게 된다. 따라서 scissor bite는 즉시 차단 교정을 해야 하며 일반적으로 scissors bite의 치료는 고정성 또는 가철성 장치를 이용하여 하악을 확장한다. 이에 저자는 scissors bite를 보이는 환아의 4세의 두명의 남아에게 Schwarz 장치를 이용하여 양호한 결과를 얻어 scissors bite의 치료법 제시에 도움이 되고자 보고하는 바이다. A scissors bite in the posterior teeth occurs when the upper teeth are positioned totally or unilaterally buccal to the lower teeth in centric occlusion. This malocclusion can result from either excessive width of maxilla, deficient width mandible, or combination of both. The malocclusion can lead to hindered growth of jaws or to asymmetry between the jaws. Besides, the severe lingual inclination of the mandibular posterior teeth prevents adequate mastication. Thus, the scissors bite is in need of immediate interceptive orthodontic interbention. The common treatments of the scissors bite is to expand the mandibular arch: fixed or removable appliances. In our clinic, we made a seccess in treatment of the scissors bite using the Schwarz appliance. We treated the scissors bite using the lower Schwarz appliance for a mean observation period of 21 months. The subjects were 2 boys, aged 4 years.
미맹출 영구 견치 및 소구치 근원심 폭경 추정에 관한 연구
황민성,김정욱,장기택,이상훈 大韓小兒齒科學會 2002 大韓小兒齒科學會誌 Vol.29 No.1
본 연구는 서울시 치과의사횡에서 주관한 건치아동 선발대회 후보의 경석고모형 162쌍을 분석하여 성별에 따라 하악 영구 4전치 근원심 치관 폭경합의 계측치에서 상악 및 하악의 편측 영구 견치 및 제 1, 2 소구치 근원심 폭경합을 추정하는 회귀방정식과 확률표를 구하였다. 그리고 성별간 차이를 비교하여 다음과 같은 결과를 얻었다. 1. 남자와 여자 모두 동일한 악궁 내에서 좌우측 영구 견치 및 소구치의 폭경합은 유의한 차이가 없었다.(p>0.05). 남녀간의 상하악 좌우측 영구 견치 및 소구치의 폭경합의 계측치(x)에서 상악 및 하악의 편측 영구 견치 및 제 1, 2 소구치의 근원심 폭경합(y)을 추정하기 위한 회귀 방정식은 다음과 같았다. 남자 상악 영구 견치 및 소구치 폭경합 : y=10.45+0.53x 남자 하악 영구 견치 및 소구치 폭경합 : y=10.07+0.51x 여자 상악 영구 견치 및 소구치 폭경합 : y=12.65+0.42x 여자 하악 영구 견치 및 소구치 폭경합 : y=11.70+0.42x 남자+여자 상악 영구 견치 및 소구치 폭경합 : y=11.01+0.50x 남자+여자 하악 영구 견치 및 소구치 폭경합 : y=9.87+0.51x The purpose of this study was to establish regression equations and probability charts for predicting the summ of mesiodistal crown diameters of unerupted unilateral canine and premolars from the sum of mesiodistal crown diameters of four mandibular incisors in Korean male and female. The plaster casts of 162 children(75 boys and 87 girls) among the contestees in 1994-2001 Healthy Dentition Contest in Seoul were measured. Sex differences are compare and the following results were obtained: 1. Bilateral comparison of sum of widths of permanent canine and premolars showed no significant differences for either sex(p>0.05). Sum of widths of permanent canine and premolars of male were significantly larger than that of female(p<0.01). 2. Regression equations for the prediction of sum of widths of permanent canine and premolars in each sex were as follows: Male ∑ Maxillary 345 : y=10.45+0.53x Male ∑ Mandibular 345 : y=10.07+0.51x Female ∑ Maxillary 345 : y=12.65+0.42x Female ∑ Mandibular 345 : y=11.70+0.42x Male+female ∑ Maxillary 345 : y=11.01+0.50x Male+female ∑ Mandibular 345 : y=9.87+0.51x
Homotopy Extension性의 몇가지 適用에 관하여
張澤相 群山大學校 1984 論文集 Vol.7 No.-
위상공간 X, Y가 같은 homotopy type이 아님을 보일 때는 각각의 homotopy type invariant을 구하고, 같은 homotopy type임을 보일 때는 한 homotopy equivalence X→Y을 구하는 방법등이 유용하게 이용된다. X, Y가 거듭된 adjunction space로 주어졌을 때 homotopy equivalence을 보이기 위하여 本 稿에서는 homotopy extension property로 glueing theorem을 증명하고 adjunction space에서의 몇가지 적용을 고찰하였다.
강성보,윤병수,홍일표,민택기 忠南大學校 産業技術硏究所 1998 산업기술연구논문집 Vol.13 No.1
This study deals with the friction weldability of STS304 Austenitic stainless steel to 6000 series aluminium alloys, those are A6061-T6, A6063, A6351. The total upset the biggest in case of STS304-A6063 and depend on strength of aluminium alloy. All welded specimen in the condition of upset pressure 75MPa exceeded the tensile strength of base metal. As a result of analyzing the tensile fracture surfaces, it showed ductility in case of both STS304-A6063 and STS304-A6351, while it showed poor ductility in case of STS304-A6061-T6. The results of bending test coincide with characteristic of tensile fracture surfaces. In the case of STS304-A6063 and STS304-A6351, any crack did not appear in welded joint, even in bending up to 90o. As a result of EDAX analysis of welded joint, it has been confirmed that Ni, Cr and Fe in STS304 were diffused toward aluminium alloy side. Consequently, friction weldability of STS304-aluminium alloys is determineded by combination of micro deformation and diffusion.
CuW와 Cu를 이용한 마찰용접부의 미세조직에 관한 연구
姜聲甫,閔宅基,洪日杓 忠南大學校 産業技術硏究所 1996 산업기술연구논문집 Vol.11 No.2
This report deals with the microstructure when the friction welding between CuW and Cu. As a result of microstructure analysis, the application of high friction pressure and upset pressure is able to decrease bonding strength because the microstructure of weld interface is changed abruptly. The fine tungsten grains at high friction pressure(6kg/㎟) could induce the crack formation along weld interface and fracture adjacent to the weld interface. HAZ of Cu side was narrowed with high friction pressure because time required to reach steady state was decreased.
Air abrasive technique 을 이용한 복합레진 수복 증례
장기택,이상훈,한세현,이창우 大韓小兒齒科學會 1997 大韓小兒齒科學會誌 Vol.24 No.4
The air abrasive technique is a non-mechanical method by which teeth are treated before restoration and stains and calculi are removed from tooth surfaces using the kinetic energy of small particles. The air abrasive technique in dentistry was first introduced in the 1950's with as instrument called 'Airdent'. But, as the main restorative materials of the period were amalgam and gold, and the instrument's inability to control the flow of particles caused the particles to be spread throughout the clinics, widespread use was not possible. In the 1990's, as these techincal problems were solved and more interest in new restorative materials rose in an effort to preserve sound tooth structure, new developments took place in instruments related to the air abrasive technique. The air abrasive technique produces less pressure, vibration and heat that might cause patient discomfort and facilitates the preservation of sound tooth structure. It also reduces the need for anesthesia and is less harmful to the pulp. Other advantages include increase in dentin bonding strength of composite resin, lower possibility of saliva contamination and maintenance of a dry field. But there is not direct contact between the nozzle and the tooth, the operator cannot use his or her tactile sense and must rely solely upon visual input. Other disadvantages are : the tooth preparation depends on the operator's ability ; alpha-alumina particles, after bouncing off the tooth surface, cause damage to dental mirrors ; the equipment is expensive and takes up a certain amount of space in the clinic. The author conducted case report using the air abrasive technique on patient visiting the Department of Pediatric Dentistry at Seoul National University Dental Hospital and arrived at the following conclusions. 1. The tooth preparation capability of different air abrasive devices varied widely among manufacturers. 2. It was more effective in treating early caries lesions and stains compared to lesions where caries had already progressed to produce soft dentin. 3. The cold stream and noise caused by the evacuation system was a major cause of discomfort to pediatric patients. 4. As there is no direct contact with tooth surface when using the air abrasive technique for tooth preparation, considerable experience and skill is required for proper tooth preparation.