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N-phenylbenzohydrazonyl bromide의 加水分解反應
權奇星,成洛道,朴文奎 충남대학교 자연과학연구소 1979 學術硏究誌 Vol.6 No.1
The rate constants for the hydrolysis of phenylbenzohydrazonyl bromide (BPH) at various pH range are determined by spectrophotometry and a rate equation which can be applied over wide pH range is obtained. Analysising pH-rate profile, the total rate constants consists of three parts; (1) pH independent part, (2) dependent on hydrogen ion, and (3) dependent upon hydroxide. A general rate equation which can be applied over wide pH is as following; kt=ko+k^(H)[H₃O^(+)]+k^(OH)[OH^(-)] kobsd.=2.76×10^(-6)+6.41×10^(-4)[H₃O^(+)]+3.77×10^(-19)/[H₃O] The hydrolysis proceed through addition-elimination below pH 2.50 and SN₂reaction above pH 13.0. In the range of pH 4.0-11.50, SN₁reaction occur respectively.
X선 촬영인자의 변화에 따른 영상의 주관적인 화질 평가
권덕문,박명환,김성환,박종삼,이준일,남효덕 대구보건대학 2001 대구보건대학 論文集 Vol.21 No.-
In this study, visual recognition of X-ray images were estimated using hawlet charts. The resolution has achieved excellent result when densities of film were 1.0~1.5. The more thickness of object was increase, the more the resolution was decrease, because scattered X-ray were increased. The more distance of object to film was increase, the more the resolution was decrease, because groedel effect. The more focal spot size was increase, the more resolution was decrease, because unsharpness was increase. The more field size was increase and grid ratio was decrease, the more resolution was decrease, because scattered X-ray were increase. As a result, we could to improve image quality by determination of resolution according to Radiography parameters. And, we proved that hawlet charts were useful for estimate of image quality and set up x-ray radiography.
α-Bromobenzaldehyde-p-nitrophenylhydrazone의 알카리 가수분해 반응 메카니즘
권기성,이천배,박문규,성낙도 충남대학교 기초과학연구소 1980 연구논문집 Vol.1 No.-
The rate constants for the hydrolysis of the derivatives of α-bromobenzaldehyde-p-nitro-phenylhydrazone (p-H, p-OCH_3, p-Cl, p-NO_2) at various pH have been determined by UV spectrophotometry in 50% dioxane at 25℃ and the following rate equations which can be applied over wide pH range were obtained. i. e. α-bromobenzaldehyde-p-nitrophenylhydrazone; kobs.=1.25×10 exp (-7) + 7.92×10 exp (-11)/〔H^+〕+1.51×10 exp (-7) α-bromo-p-chlorobenzaldehyde-p-nitrophenylhydrazone; kobs.=1.06×10 exp (-7) + 1.08×10 exp (-10)/〔H^+〕+1.45×10 exp (-7) α-bromo-p-methoxybenzaldehyde-p-nitrophenylhydrazone; kobs.=1.79×10 exp (-7) + 1.40×10 exp (-10)/〔H^+〕+4.08×10 exp (-7) α-bromo-p-nitrobenzaldehyde-p-nitrophenylhydrazone; kobs.=7.10×10 exp (-8) + 2.89×10 exp (-10)/〔H^+〕+2.37×10 exp (-7) Below pH 2, the rate of hydrolysis of α-bromobenzaldehyde-p-nitrophenylhydrazone is accelerated by electron-donating group (ρ=-0.91). Above pH 5, however, this reaction is slowded down by electron-attracting group (ρ=0.37). From the rate equation and the effect of solvent and substituent upon the rate of reaction, below pH 2, the hydrolysis proceed through SN_1 mechanism. Above pH 5, the hydrolysis proceed through 1.3-dipolar ion mechanism. And in the range of pH 2∼5 these two reactions occur competitively.
p-Methoxystyrylphenylsulfone의 가수분해 반응메카니즘에 대한 반응속도론적 연구
權奇星,高東成,朴文奎,金演斗,成洛道 충남대학교 기초과학연구소 1981 연구논문집 Vol.2 No.-
The rate constants for the hydrolysis of p-methoxystyrylphenylsulfone were determined at wide pH ranges by means of UV spectrophotometer and the rate equations which could be applied to the experimental results were obtained. Form the facts, reaction mechanism was proposed : above pH 11.5, the rate is only dependent on the concentration of hydroxide ion and below pH 9.5, the reaction is initiated by the attack of a water molecule on the activated carbon-carbon double bond. In the range of pH from 9.5 to 11.5, these two reactions occur competitively.
권정현,장홍래,성제중,안형근,장순재,송문호 한국비파괴검사학회 2003 학술대회 논문집 Vol.- No.1
The nondestructive testing using ultrasonic pulse-echo data is an effective test methodology esperially for metal structure. Typically, the ultrasonic pulse-echo data is processed and the results are shown in A-scan, B-scan or C-scan formats. Upon viewing B-scan and C-scan data the viewer is able to identify the location of faults as well as their rough dimension. In this paper, we evaluate the applicability of various 3-D visualization methods frequently used in medical imaging, namely, surface rendering (SR), volume rendering (VR) and maximum intensity projection (MIP), for nondestructive testing purposes. Such 3-D visualization of ultrasonic pulse-echo data enables easier identification of the location and dimension of faults more accurately.
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.
과도한 운동으로 발생한 횡문근융해증에 의한 급성신부전증 1예
문철호,류보열,모성환,김태종,기장도,박용관,김용환,정종훈 조선대학교 1995 The Medical Journal of Chosun University Vol.20 No.1
Rhabdomyolysis may be defined as a clinical and laboratory syndrome which releases muscle cell contents into the plasma, such as creatine phosphokinase, due to skeletal muscle injuries. It can be the result of many diverse causes including muscle disease, ischemia, genetic disorder, metabolic disorder, infectious disease, drugs, comatose state, trauma or vigorous exercise that can lead to acute renal failure as a complication. Since first reported in 1941, rhabdomyolysis-induced acute renal failure has been documented many times, and the major causes of this disease are carbon monoxide poisoning, snake bites, and etc in Korea Reports of acute renal failure after exercise-related rhabdomyolysis with myoglobinemia are rare. We report a case of acute renal failure caused by exercise-related rhabdomyolysis in a 20 year old man.
Azomethine 탄소원자의 친핵성 치환반응 (제 1 보) 물-디옥산 혼합용매중 Aryl N-Aroylchloroformimidate 유도체의 가용매 분해반응
성낙도,권기성,박문규 圓光大學校 1981 論文集 Vol.15 No.1
Kinetic studies on solvolsis reactions of aryl N-aroylchloroformimidate derivatives in 1.4-dioxane-water mixture have been carried out by means of ultra-violet spectrophotometry at 20℃. Results of m values of Grunwald-Weinstein plots(m=0.4~0.8), substituent effect(ρ=0.15), and n values of Kivinen plots(n=0.7~1.2), show that the solvolysis displacement of aryl N-aroylchloroformimidate derivatives proceed via SN₂ mechanism.