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길남규,성기완,안창윤,민택기 충남대학교 공업교육연구소 1999 論文集 Vol.22 No.1
This study deals with the mechanical properties of welding part, by friction welding of SM45C steel rod and SWS41A yoke which have being used Steering-Joint. The experimental results are summrized as follows ; 1. When CO₂welding is replaced with friction welding, we can get benefit manufacture. 2. The result of tensile test showed the highest tensile strength of 612MPa(150% of base metal strength 402MPa). 3. The result of bending test showed the highest bending strength of 1066MPa(80% of base metal strength 1259MPa).
복합레진의 표면거칠기에 따른 투명도와 표면 색상의 차이에 관한 연구
조규정,박수정,조현구,김동준,황윤찬,오원만,황인남 大韓齒科保存學會 2006 Restorative Dentistry & Endodontics Vol.31 No.4
본 연구는 복합레진의 표면 연마에 의한 표면 거칠기가 표면 색상과 투명도에 어떤 영향을 미치는가를 알아보고자 시행하였다. Charisma (Heraeus Kulzer GmbH, Domagen, Germany)의 B1과 A3, Esthet-X (DENTSPLY Caulk, Milford, USA)의 B1과 B3 레진으로 거칠기에 따른 표면 색상을 평가하기 위한 직경 8㎜, 두께 5㎜의 시편을 제작하고, Sof-Lex finishing & polishing system(3M, ESPE Dental Products. St. Paul USA)의 C, M, F, 및 SF 디스크로 시편의 한쪽 면을 연마하였으며, 연마 전 Mylar strip으로 압축된 면을 대조군으로 하였다. 거칠기에 따른 투명도의 차이를 평가하기 위한 두께 1 ㎜의 시편을 Charisma의 A3로 제작하여, 한쪽 면을 600, 1000, 1500 및 2000번 사포로 연마하였다. 각 시편의 연마 전과 후, 연마면의 CIE L^(*)a^(*)b^(*)값과 1 ㎜ 시편의 백색과 흑색 배경판 상에서의 Y값을 spectrophotometer인 Spectrolino (GretagMacbech, Regensdorf, Switzerland)를 사용해 측정 분석하였으며, 각 시편의 연마 전과 후의 평균 표면 조드 (Ra)값을 Surface Roughness Tester SJ-301 (Mytutoyo, Tokyo, Japan)로 측정했다. L^(*)값은 재료와 색상에 상관없이 가장 거친 Sof-lex C 디스크로 연마한 군에서 가장 높은 값을 보였으며 (p < 0.05). Esthet-X B3군을 제외한 모든 군에서 Ra값이 감소함에 따라 L^(*)값도 낮아졌다. a^(*)값은 표면 거칠기에 따라 특정한 변화 양상을 보이지 않았으며, b^(*)값은 Esthet-X B1군을 제외한 모든 군에서 Sof-lex SF 디스크로 연마 시 가장 높은 값을 보였으며 (p < 0.05), Charisma B1과 Esthet-X B3군에서 Ra값과 비교적 높은 상관 관계를 보였다. Contrast ratio는 1000번과 1500번 사포로 연마한 군간을 제외한 모든 군 간에 유의한 차이를 보여으며 (p < 0.05). 표면 거칠기가 감소함에 따라 contrast ratio도 감소하였다(R2 = 0.801). The objectives of this were to evaluate the effect of surface roughness on the surface color and translucency of the composite reins. Two composite resins (Esthet-X, Dentsply, Milford, USA and Charisma, Kulzer, Domagen, Germany) were used to investigate the surface color. Charisma was used to investigate the translucency. 40 disc samples (diameter: 8 ㎜, thickness: 5 ㎜) were made by each product to measure the surface color. Ploymerized each sample's one side was treated by Sof-Lex finishing and polishing system (Group C, M, F, SF). 40 disc samples (diameter: 6 ㎜, thickness: 1 ㎜) were prepared to measure the opacity. 1 ㎜ samples were ground one side with #600, #1000, #1500 and #2000 sandpapers. CIE L^(*)a^(*)b^(*) values of each 5 ㎜ thickness samples, and XYZ values of 1 ㎜ thickness samples on the white and black background were measured with spectrophotometer (Spectrolino, GretagMacbeth, Regensdorf, Switzerland). Mean surface roughness (Ra) of all samples before and after surface treatment was measured using the Surface Roughness Tester SJ-301 (Mytutoyo, Tokyo, Japan). Regardless of type and shade of the composite resin, L^(*) values measured in group C were higher than others (p < 0.05), and L^(*) value decreased as the Ra value decreased except B3 shade of Esthet-X. But there were no significant difference in a^(*) values among groups. In control group and SF, highest b^(*) values were measured (p < 0.05), except B1 shade of Esthet-X. Contrast ratio decreased as the Ra value decreased (p < 0.05). With the above results, difference of surface roughness has influence on surface color and translucency of dental composite resins. 〔J Kor Acad Cons Dent 31(4):312-322, 2006〕
발기부전 검사에서 천연색 복합초음파촬영술과 야간음경발기검사의 일치도
송윤섭,구자현,김민의,이혜경,김두상,박영호,이남규 순천향의학연구소 1999 Journal of Soonchunhyang Medical Science Vol.5 No.1
We intended to know that the result of color duplex ultrasonography corresponded to that nocturnal penile tumescence rigidity in the diagnosis of erctile dysfunction. We performed both color duplex ultrasonography and nocturnal penile tumescence rigidity in 15 erectile dysfunction men. Colr duplex ultrasonography was done with a 7 MHz. color Doppler unit after intracorporeal pharmacological injection and measured maximal arterail diameter, peak systolic velocity, end-diastolic velocity and the results were compared with rigidity and tumescence in nocturnal penile tumescence rigidity using RigiScan. The positive predictive value, negative predictive value, sensitivity, specificity, overall accuracy of color duplex ultrasonography was reasonable when the result of color duplex ultrasonography was compared with the that of nocturnal penile tumescence rigidity. According to this results, color duplex ultrasonography could not only predict but also correspond to nocturnal penile tumescence. Therefore, we suggest that color duplex ultrasonography can relpace nocturnal penile tumescence rigidity if psychogenic and neurogenic erectile dysfunction are distinguished by history and neurologic examination.
김윤영,김남령,이용균,최순규,이시우,정대일 東亞大學校 1993 東亞論叢 Vol.30 No.1
As a new protective group for diols, cyclic oxalates (20) (24) were synthesized by using oxalyl chloride, ethyl oxalyl chloride, diethyl oxalate and oxalic acid. In the reaction of diol with oxalyl chloride, the product was a mixture of the cyclic oxalate (20) and mono oxalated(21). When ethyl oxalyl chloride was used which pyridine as base, acyclic oxalates (22) (25) were obtained. Whereas ethyl oxalyl chloride which triethylamine instead of pyridine, cyclic oxalates (20) (24) as well as acyclic oxalates (22) (25) were obtained. Using diethyl oxalate, the amounts of cyclic oxalates (20) (24) were increased, but there were some difficulties in separations of its desired products. Oxalic acid, however, did not afford cyclic oxalates but gave formate which probably was formed by decarboxylation of hydroxyoxalyl group.
四肢의 Scar Revision에 있어 Modified Millard's Trick의 利用
金勳男,崔性玔,李斗炯,李圭源,皇甫宗演 大韓成形外科學會 1976 Archives of Plastic Surgery Vol.3 No.1
No matter how various methods may be tried, for scar repair of extremities, the results were not so acceptable unfortunately. Of these procedures, Millard's trick (The Double-Breasted Vest Principle) is the one of most popular methods and which has been loved by many surgeons, esp, plastic surgeons, up to date. However, even this method couldn't satisfied us, because of undesirable disadvantages, and our new repair method, entitle "Modified Millard's Trick Method" was designed with supplement of disadvantages of Millard's Tric in mind and has been used in attempt to prevent recurrence of the usual spread. This approach is advocated for scars in area where stretch-ing is usual or where a careful regular repair has failed to prevent it. If there is any depression associated with the scar, this is corrected simultaneously by advancing both skin flaps in opposite direction. We have tired this new method for 1- cases of patients, esp. for relatively wide linear scar (over 5cm) on extremities.