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Whang, Joo-Ho,Chung, Jin-Bum,Kim, Tae-Woo Korean Nuclear Society 2001 Nuclear Engineering and Technology Vol.33 No.5
Optimum characteristics of digital X-ray sensor components were analyzed to develop intra- oral dental digital X-ray image sensor using indirect method. Parametric analysis was carried out to optimize the phosphor thickness and the fiber optic plate (FOP) coupling to charge coupled device (CCD). X-ray absorption and light diffusion in the phosphor layer were analyzed by the Monte Carlo method. Real time X-ray image was obtained with prototype X- ray image sensor using general CCD camera with 1∼10 Ip/mm resolution. It has been previously shown that large resolution degradation in X-ray images was caused by miss alignment of FOP to CCD and optical adhesive selection. In this study, we reported that X-ray image quality was greatly improved by using optimized characteristics of alignment device and phosphor thickness.
A Study on Caliration of Neutron Moisture Gauge Using MCNP4A
Whang, Joo-Ho,Lim, Chun-Il,Song, Jung-Ho 대한방사선 방어학회 1997 방사선방어학회지 Vol.22 No.4
중성자 수분함량 측정기의 개발에 있어서 중성자 계측값과 흙속의 수분함량에 대한 관계식을 유도하기 위해서는 공시체 제작등의 많은 실험을 통해 유도한 교정식이 필요하다. 또한 공시체 제작 및 측정실험의 통계적 오차를 줄이기 위해서는 많은 시간과 노력이 필요하다. 하지만 몬테카를로방법을 사용한 전산코드를 이용하여 수행할 경우 시간과 노력을 줄일 수 있을 뿐만아니라, 보다 일반적인 흙에 대한 교정식을 얻을 수 있다. 본 연구에서는 중성자의 수송문제를 계산하는데 유용한 MCNP4A 전산코드를 이용하여 실제 실험을 모사하였다. 또한 모사결과를 공시체를 제작하여 실험한 결과와 비교하였다. 비교결과 실제실험의 결과와 모사 범위내에서 일치함을 알 수 있었다. 중성자 수분함량 측정기의 교정식 도출 및 교정상수를 결정하기 위해 적용할 수 있음을 알 수 있었다. 또한 수분함량 측정기의 계측값에 영향을 미치는 인자중의 하나인 흙의 건조밀도 변화에 대한 영향을 살펴 보았다. Time-consuming experiments have been required in the development of neutron moisture gauge to induce a relation between the water content in soil and the neutron counts. Applying a monte carlo computer code to simulate the experiments of neutron moisture gauging may contribute to redue time and efforts for experiments and produce a calibration equation which is more applicable to soil in general. In this study MCNP4A, a monte carlo computer code, was employed to simulate soil experiments and the simulated results were compared with experimental ones. The comparative study showed that MCNP4A is applicable to simulate the experiments and calibration equation can be obtained through simulations. Effects of dry density changes were also studied.
황용길,성주경,김재호 대한금속재료학회(대한금속학회) 1974 대한금속·재료학회지 Vol.12 No.2
피크링 폐황산중 용존된 철분을 회수하여 산화철 안료를 만들기 위한 연구이다. 우선 피크링 폐황산 (Fe 44/l, SO^(2-)₄177g/l)을 가성소다 용액으로 중화하여 수산화 제1철을 얻었다. 이것을 100℃, 3∼5 atm(送入空氣壓) 하에서 2시간동안 digestion 하였더니 다음과 같이 되었다. 1) Fe(OH)₂와 피크링 폐황산 (혼합용액의 pH7.9)이 반응시는 α-goethite가 생성되고 철의 회수율은 74% 이상이었다. 2) Fe(OH)₂와 황산제2철용액 (spent solution)이 반응시는 magnetite가 되고 90% 이상의 철이 회수되었다. 3) Fe(OH)₂(pH12 solution)만을 반응시킬시는 δ-goethite가 생성되고 90% 이상의 철이 회수되었다. 상기와 같이 생성된 α-goethite와 magnetite를 600℃에서 하소(calcination) 하였더니 모두 양호한 산화제2철 안료로 되었다. 그리고 δ-goethite를 600℃에서 하소하였더니 α-산화제2철과 magnetite의 혼합물이 생성되었다. The formation of iron oxide in a synthetic picklic sulphuric acid studied at elevated temperature and pressures. Waste picklic sulphuric acid was neutralized by adding sodium hydroxide, resulting hydrous ferrous oxide. The hydrous ferrous oxide thus formed was digested under a pressure of 3 to 5 atmospher at 100℃ for two hours. The results obtained were as follows; 1) When Fe(OH)₂ and picklic acid of pH 7.9 were reacted, 74% of iron was recovered in the form of α-goethite. 2) When Fe(OH)₂ and ferric sulphate solution (spent solution) were reacted, the yield in magnetite was better than 90%. 3) When Fe(OH)₂ of pH 12 reacted alone, δ-goethite was formed and yield was higher than 90%. When magnetite and α-goethite obtained were calcined at 600℃ it had been shown that they both could be turned into α-ferric oxide of the pigment grade, a mixture of α-ferric oxide and magnetite was also formed, when σ-goethite was calcinated at 600℃.
일차성 식도 이완 불능증에서 내시경적 보툴리늄 독소 주입 치료의 평가
조주영,이준성,김진오,이문성,장재영,심찬섭,조영덕,최우봉,홍수진,문종호,함정식,임희혁,김연수,황성규 대한소화기내시경학회 1997 Clinical Endoscopy Vol.17 No.6
Primary achalasia is a disorder of swallowing in which the lower esophageal sphincter fails to relax. Traditional treatment methods are balloon dilatation and myotomy, but these methods have critical complications and even fatal including esophageal perforation, gastroesophageal reflux, and continuing dysphagia. Botulinum toxin, which has been used for dystonias of skeletal muscles, is presented as a new alternative treatment method for achalasia, aimed to lowering of LES pressure by Pasricha et al. They also reported that endoscopic botulinum toxin injection into LES was effective, safe, and simple method without any significant complication. We report 7 cases of primary achalasia treated with endoscopic botulinum toxin injection, who showed clinical improvement without any complication. We compared results of pre-treatment with those of post-treatment using botulinum toxin in the aspects of clinical, radiological, manometrical recording in these cases. Symptomatic improvement was shown in 4 cases(57.1%), symptom score was decreased from 7.43+- 0.53 to 4.43+- 2.51(p=0.03), The luminal diameter at esophagogastric junction increased from a mean of 3.21+-$gt; 0,99 mm to 5.14+- 0.90 mm (p=0.015), and luminal diameter at esophageal body decreased from a mean of 40.29+- 19.37 mm to 32.71+-15.45 mm (p=0.015). In follow up manometric recording, peristaltic waves at the body were recovered in 2 cases(28.6%), gastroesophageal pressure gradient(AP) was non-significantly decreased from 6.30+-4.0 mmHg to 3.12+-4.47 mmHg (p=0.45). One patient complained of transient chest pain within one hour after the botulinum toxin injection, but she did not need any medication. We concluded that botulinum injection was a simple, safe, and effective therapeutic method for primary achalasia, even though further evaluatian should be performed in the much more cases and the results of long term follow-up, and cost-effectiveness of this method.
무청으로부터 분리된 이소람네틴 3-O-beta-D글루코피라노사이드의 항헤르페스 바이러스 1형(HSV-1) 효과
김호경(Ho Kyoung Kim),강봉주(Bong Joo Kang),박갑주(Kap Joo Park),고병섭(Byoung Seob),황완균(Wann Kyun Whang) 대한약학회 1998 약학회지 Vol.42 No.6
In the course of our search for anti-Herpes simplex virus type I (HSV 1) substances from natural sources, we screened crude drugs for their antiviral activity using SRB assay. The methanol extract from herb of Brassica rapa (Cruciferae) was found to inhibit HSV-1. Though bioassay-directed fractionation of the extract, anti-HSV-1 agent was isolated by chromatographic separation using Amberlite XAD-4 and Sephadex LH-20. The structure of compound I was elucidated by spectral means including 1H-1H COSY, HMQC and HMBC to be isorhamnetin 3-O-beta-D-glucopyranoside (compound I). Compound I was active against HSV-1 with the 50% effective concentration of O.42mg/ml and the 50% cytotoxicity of 5.0mg/ml.
이진호,김홍용,신원창,김관엽,차순주,류종철,황성보,윤진일,함희룡 대한소화기학회 1992 대한소화기학회지 Vol.24 No.6
Nontropical idiopathic splenomegaly or Dacies syndrome is massive splenomegaly of unknown cause, accompanying the pancytopenia, especially neutrapenia and subsequently developing malignant lymphoma. We reported a case of nontrapical idiopathic splenomegaly confirmed by surgery in a 33-year-old woman who presented with severe exertional dyspea and huge splenomegaly.
Hwang, Sung Ho,Yu, Jeong-Sik,Chung, Jae-Joon,Kim, Joo Hee,Kim, Ki Whang The Korean Society of Radiology 2011 KOREAN JOURNAL OF RADIOLOGY Vol.12 No.3
<P><B>Objective</B></P><P>We wanted to validate the additional merit of the thinner coronal reformation images from multidetector CT (MDCT) for making the diagnosis of hepatic cysts.</P><P><B>Materials and Methods</B></P><P>For the 90 benign hepatic cysts confirmed on MRI, the transverse (5-mm thickness) and additional coronal (2-mm thickness) reformation images from MDCT were compared with each other in terms of the Hounsfield units (HUs) and the size of each hepatic cyst.</P><P><B>Results</B></P><P>The attenuations (mean: 17.2 HUs, standard deviation: ± 14.4) on the thinner coronal images were significantly lower than those (mean: 40.7 HUs; standard deviation: ± 20.6) on the thicker transverse images for the small hepatic cysts (≤ 10 mm on the transverse image, <I>p</I> < 0.01). Twenty-three (79%) of the 29 cysts between 5 mm and 10 mm and 21 (51%) of 41 lesions up to 5 mm showed a mean HU value of 20 or less on the coronal reformation images.</P><P><B>Conclusion</B></P><P>By reducing the partial volume effect, routine coronal reformation of MDCT with a thinner section thickness can provide another merit for making a confidential diagnosis of many small sub-centimeter hepatic cysts, and these small cysts are not easily characterized on the conventional transverse images.</P>