흉·요추부 골절환자의 수술적 치료 결과

신규철,강대술 건국대학교 의과학연구소 1998 건국의과학학술지 Vol.8 No.-

There have been progressive increase in use of internal fixator for the treatment of thoracolumbar spinal fracture that offers several advantages such as more rigid fixation and stabilization of the fractured spine, earlier mobilization and rehabilitation, prevention of the further deformity, shortening of the hospitalization. We analyzed the clinical outcomes of 28 cases of thoracolumbar spinal fracture patients who had an operation from January 1994 to January 1997. The results obtained are as follows; 1. Of 28 cases, 17 cases were male and 11 cases were females. Average age was 42 years. 2. The most common site of injuries was L1 (11 cases). 3. The surgical indications are 1) 40% reduction of the height of anterior surface of the vertebra in compression fracture 2) the unstable bursting fracture 3) association with more than 35 degrees kyphotic deformity 4) posterior soft tissue injury in flexion-distraction injury 5) associated with neurologic symptoms. 4. The clinical outcomes as relief of pain, adaptation for the previous job, postoperative complications are good. 5. The proper surgical indication is to be considered as the most important factor in surgical treatment of the thoracolumbar spinal fracture.

일측 경추 신경근증에 대한 전방경유 미세 추간공확장술의 기술상의 개선

김대용,김우경,이상구,김영보,박철완,박찬우 The Korean Neurosurgical Society 2004 Journal of Korean neurosurgical society Vol.35 No.2

개량형 치과용 시멘트의 용해도 및 피막도에 관한 비교연구

김철위,김종배,백대일,이용근 대한치과기재학회 1987 대한치과재료학회지 Vol.14 No.1

The purpose of this study was to evaluate the solubility, disintegration and film thickness of twenty-five commercially available cements-zinc phosphate (AD, AS, DH, FZ, GCB, HC, HZ, LZ, LMZ, SC and TZ), polycarboxylate (DA, DR, GCC, HPC, LC, PF, SCB, and SU) and glass jonomer (HB and OS) cements used in Korea. These tests were performed according to the modified methods of KDA Specification No. 1, 2, ISO 1566, 4104, and ANSI/ADA Specification No. 8, 61. The following results were obtained: 1. The solubility of the glass ionomer cements was higher than that of the zinc phosphate and the polycarboxylate cements. 2. The film thickness of the zinc phosphate cements was slightly higher than that of the polycarboxylate and the glass ionomer cements. 3. The solubility and the disintegration of the glass ionomer cements showed considerable differences according to the products.

Diethyl 1-chloro-2-phenyl-2-(tosyl) aminoethylphosphonate 의 결정 및 분자구조

김대영,이재혁,신준철,김문집 순천향대학교 기초과학연구소 1997 순천향자연과학연구 논문집 Vol.3 No.1

The crystal and molecular structure of diethyl 1-chloro-2-phenyl-2-(tosyl)aminoethyl phosphonate has been determined from single crystal X-ray diffraction study ; C19H25NO5PCIS, Monoclinic, P2₁/a, a=10.8507(11)Å, b=16.1201(12)Å, c=12.7354(12)Å, β=90.192(7)°, V=2227.6(3)ų, T=293(2)K, Z=4, Cuk α(λ=1.54178Å). The structure was solved by direct method and refined by full-matrix least squares to a final R=5.17% for 2444 unique observed F0> 4σ(F0) reflections and 254 parameters.

치면열구전색제의 시차열분석에 관한 연구

조대윤,김철위 大韓齒科器材學會 1992 대한치과재료학회지 Vol.19 No.1

The phase change and thermal reaction of various types of pit and fissure sealants may be important to find out the compositional variation and thermal stability of those materials. In this experiment, the autothermograms of pit and fissure sealant were obtained, from which we determined the difference of reaction mechanism according to the compositional change and temperature rise. Three species of light cured resin based pit and fissure sealant, three species of chemically cured resin based pit and fissure sealant, and one species of type Ⅲ glass ionomer pit and fissure sealant were analyzed by differential thermal analyzer (DTA). The temperature was raised from room temperature to 700℃ with the heating rate of 20℃/min. and each sample weight was 15 ㎎. From the experiment, the following results were obtained: 1. The pit and fissure sealants studied in this experiment, as the temperature rise, generally showed endothermic transition at low temperature, and exothermic transition at higher temperature. 2. The light cured and chemically cured resin based pit and fissure sealants showed exothermic transition within the range of 207.0℃∼244.0℃, and endothermic transition within the range of 480.0℃∼520.3℃. 3. There was no significant difference in the peak temperature of endothermic and exothermic transition between the light cured and chemically cured resin based pit and fissure sealants (p>0.05). 4. Type Ⅲ glass ionomer pit and fissure sealant showed exothermic transition within the range of 243℃∼246℃, endothermic transition within the range of 478℃∼486℃, and second exothermic transition within the range of 546℃∼564℃.

播種期移動에 따른 生育, 收量 및 種實成分의 變化

金鍾喆,吳柱成,鄭大守 東亞大學校 大學院 1997 大學院論文集 Vol.22 No.-

Days to flowering and maturity had a get tendency to be short according as delaying the seeding, the number of pods and 100 seed weight had a tendency to increase by the early seeding, although there were no significant differences of seeding time on the stem length, number of branches, and number of main stem nodes, respectively. Yield of each soybean variety showed the highest value at the plot seeded on 20th June, and the corresponding value was low at the plot seeded on 5th June. Oil contents in both tested soybeans had a tendency to increase according as delaying the seeding, however, proteins showed an increasing tendency according as the earlier seeding date. The contents of histidine, valine, tryptophan, and alanine had also a tendency to increase according as the earlier seeding date. On the contrary, the contents of theronine, methionine, lysine, serine, and proline were respectively increased according as delaying the seeding. The contents of glycine and threonine showed the highest level at the plot seeded on 20the June. Among the contents of minerals in each tested soybean, potassium content was low at the plot seeded on 20th June, although there were no regular tendency of the treatments.

洪水追跡法에 의한 河道變移豫測(Ⅰ) (理論)

李大澈,이종석,朴昌圭 大田産業大學校 1996 한밭대학교 논문집 Vol.13 No.1

This study is in order to evaluate for the topographic variation by the flood routing method in alluvial channel of the erodibility. Basic equations in natural open channel induced from the control volume for the governing equation with continuity and momentum in water and sediment and the solution for these equations worked out by the finite difference method in numerical analysis. Predictions of the topographic variation leading out from as change direction and rate the various in channel width, changes in bed profiles and radius of curvature. And also, bank erodibility factor induced by the correction coefficient with conditions of bank organization and material properties, and the values used in zero to one from non-erodibility bank to non-cohesive bank, respectively.

수종 유기산 용액에서 글라스 아이오노머 시멘트의 표면조도 및 색 변화에 관한 연구

김용대,문현정,임범순,김철위 대한치과기재학회 1997 대한치과재료학회지 Vol.24 No.2

The chemical bonding ability of glass ionomer cement to tooth structure and sustained fluoried release render glass ionomer cements advantageous over other restorative materials, such a amalgam and composite resins. Poor polishability and high solubility in organic solvents, however, are still a significant disadvantage of the existing glass ionomer cements. The purpose of this study was to estimate the aging effect of glass ionomer cements in organic acid solutions on surface change and color change. Using metal molds, disk type speciments, 100mm×1mm were prepared from three chemical-curing and three light-curing glass ionomer cements. Specimens were prepared from each material following the manufacturer's intructions, and setted against a mylay matrix strip supported by a glass slab. Three specimens were prepared for each experimental groups. Profilometric analyses were carried out using the surface roughness tester(Surtronic 3P, Rank Taylor Hobson Ltd. England). R?? valuse, which were the mathematical mean values of the departure of the roughness profile from the mean line calculated by the machine, recorded. Color measurements(CIE coefficients ; L, a, b) were peformed using the spectrophotometer(CM-3500d, Minolta, Japan). Before aging treatment and after 1, 7, 14, 21, and 28 days aged at 37℃ in a various organic and solutions(such as acetic acid, lactic acid and citric acid) and deionized water, surface roughness and color coefficients measuements were carried out. Then, surface roughness changes(ΔRa) and (ΔE) of specimens were calcuiated. From the experiment, the following results were obtained : 1. Chemical-cured glass ionomer cements showed statistically surface roughness changes after aged in the deionized water(P<0.10), and light-cured glass ionomer cements showed statistically significant color changes after aged in the deionized water(P<0.10). 2. Chemical-cured glass ionomer cements showed statistically color changes after aged in acetic acid solutions (P<0.10), and light-cured glass ionomer cements did not showed statistically significant surface roughness changes, but showed statisticall significant color changes after aged in acetic acid solutions (P<0.10). 3. Chemical-cured glass ionomer cements did not showed statistically significant color changes as a function of concentration of lactic acid solutions (p>0.10), and light-cured glass ionomer cements showed statistically significant color changes after aged in acetic acid solutions. 4. Chemical-cured glass ionomer cements did not showed statistically significant surface roughness changes as a function of concentration iof lactic acid solutions (p>0.10), but showed significantly less solubility in lactic acid solutions than chemical-cured glass ionomer cements.

투기 선수들의 경기시 운동상해에 관한 조사 연구

김대건,윤민철 敎育硏究院 東國大學校 1998 교육문제연구 Vol.13 No.-

This study was aimed to investigate and analyze the cause of injury, symtoms, the region, the ways of prevention and others which have been resulted from the training or game of the athletes of the game event in order to be used as the basic materials in exploring the effective ways of minimizing the injury during the play The followings are the results from the above investigation and analysis conducted by practical ways. 1) Of the causes of the injury from sports, carelessness of the atheletes showed the highist rate of reply by 60 players(22.81%) while fatigue(extreme training) by 48 players(18.25%) , loosened attention by 33 players(12.5%) and show-off of the capacity of the athletes and lack of preparatory exercise by 27 players(10.27%) , a comparative high rate of reply 2) As the ways of preventions the injury, 48 players(18.25%) answered that mental concentration and burden of making record should be reduced by highest rate of reply while 45 players(17.11%) replied that the skill should be elevated, 28 players(10.65%)recovery from fatigue and 23 players(8.75%) perioddical physical examination. 3) When asked the case of the symtoms of injury exeperienced by the athletes as of now,the blister of the skin injury showed 1206 cases(35.33%) , and muscel blow of the injury of muscle and tendon was 1474 cases(33.82%), and broken bone of the bone injury was 1301 Cases(57.41%), and the Sprain of the injury of joint W3S 495 cases(30%), and neuralgia of the nerve and sense organs was 520 cases(38.15%) showing the highest rate of reply. 4) When asked on the experience of injury, Taekwondo athletes had injury at the jount of hand by 325 cases(10.98%), Judo players at the calf of the leg by 425 cases(9.75%). and at the below part of the (ace by 385 cases(13.36%). Wrestlers at the shoulder and neck by 295 cases(9.84%) showing highest rate of reply, and generally they and injury at the joint of hand by 1021 cases(7.77%),leg joint 960 cases(7.31%) and showulder 950 cases(7.23%) 5) When asked the ways of medical treatment after sot injured, 84 players(31 94%) were treated by orthopedy, and when asked the duration after injury, 99 players(37.64%) have been treated immediately and emergency treatment ways showed that 87 players(38.08%) treated for themselves, and the period of being injured has shown that they sot injured during the practice by 131(49.81%), and the time of being injured was at the afternoon training by 156 players (59.31%) , and the place of injury was at the regular place of contestgame by 184 players(69.96%) by highest rate of reply.

이트리아 첨가 붕규산염 유리로 제조한 알루미나-유리 복합체의 파괴인성 평가

원대희,이민호,박주미,배태성,진영철 대한치과기재학회 1998 대한치과재료학회지 Vol.25 No.2

The study was performed to evaluate the fracture toughness of dental alumina-glass. Alumina compacts were prepared by press 150㎏/㎠ and sintering at 1100℃ for 2hrs. Dense composites were made by infiltrating partially sintered alumina with four different borosilicate glasses containing 1, 3, 6, 9 mol% Yttria(Y₂O₃) at 1200℃ for 6hrs. Apparent porosity was measured by the KS L 3114 principle method. Fracture toughness values were about ∼4.72 MPa·m½. Porosity rates of alumina-glass composites were about 0.2%. The fracture surface of the alumina-glass composites showed a Palmqvist crack pattern at the fracture origin and indicated a tendency by the frictional interlocking between the microstructurally rough fracture surfaces.