Methy Tosylate의 가용매분해반응에 관한 硏究

朴炳瑞,金永基 順天大學校 1985 論文集 Vol.4 No.1

pxksdhf-아세토니트릴 및 메탄올-아세톤 혼합용매계에서 MeOTs의 가용매 분해반응을 50℃와 60℃에서 속도론적으로 연구하였다. 메탄올-아세토니틀릴 혼합용매계에서는 메탄올 함량이 90%(V/V%)인 용매조성에서 최대 반응속도 현상이 나타났다. 확장된 Grunwald-Winstein 관계식을 이용하여 본 혼합용매의 친핵도 N값을 구하였으며, 용매의 친핵도는 용매조성 변화에 따라 달라짐을 알 수 있었다. Kinetic studies for the solvoluysis of methyl tosylate have been carried out in methanol-acetonitrile and methanolacetone mixtures at 50. O and 60. O ℃. In this reaction system maximum rate constant was shown at 90% (V/V%) methanol acetonitrile mixture. Solvent nucleophilicity N values were calculated from kinetic data using the extended G runwald-W instein equation It is shown that the values vary according as the solvent composition changes.

연료가스 생산을 위한 폐타이어와 하수슬러지의 수증기가스화반응

송병호 국립7개대학공동논문집간행위원회 2004 공업기술연구 Vol.4 No.-

Waste tire scrap and dried sewage sludge have been gasified with steam in a thermobalance at temperature of 550-850℃ and steam pressure of 25-101.3 kPa. The volatile in waste tire particles was rapidly evolved in two minutes, and the residual char that is about 30 wt% of particle was reacted with steam to produce product gas containing hydrogen. Three gas-solid reaction models in literature have been used to describe the reaction behavior. The results indicate that steam gasification of both the waste tire and sludge is mainly controlled by chemical reaction. The rate of reaction is proportional to the partial pressure of steam. Among the tested gas-solid reaction models, the modified volumetric reaction model was found to be mostly appropriate. The apparent activation energy for steam gasification of waste tire, coal and sludge were found to be 39.1, 99.3, 156.5 kJ/mol respectively and the apparent reaction rates were determined.

Pleurotus ostreatus의 액체 종균 생산에 관한 연구

강태수,천병익 江原大學校 産業技術硏究所 1988 産業技術硏究 Vol.8 No.-

For the improvement of productivity of Pleurotus ostreatus, the production of liquid spawn was studied. The highest liquid spawn production was obtained after shaking culture for 4 days in the culture medium containing 5%(W/V) wheat flour, 0.2%(W/V) yeast extract, 0.1%(W/V)KNO3 0.05%(W/V)MgSO47H2O, 0.05%(W/V)KH2PO4. The optimum pH and temperature was 7.0 and 30℃. The period required to complete the mycelial growth after spawning were 28, 22, 10 and 9 days, respectively, when the 2%(V/V) of solid spawn and 2%(V/V), 5%(V/V) and 10%(V/V) of liquid spawn were inoculated. The days required from spawning to fruiting bodies were 38, 34, 28 and 27 days.

광섬유 격자 다중화 스트레인 센서 시스템

이용욱,정재훈,정승환,이병호,김남식 한국비파괴검사학회 2001 한국비파괴검사학회지 Vol.21 No.2

광섬유 센서는 구조물에 대한 비파괴적인 측정이 가능하고, 전자파에 의한 간섭이 발생하지 않으므로, 전자파 장애의 영향을 무시할 수 있는 장점이 있다. 또한, 구조물 건조시 콘크리트 같은 대상체에 광섬유를 내장시킬 경우에는 검사시 대상체를 파괴시키지 않고서도 대상체의 손상여부와 역학적 거동을 측정 및 해석할 수 있는 비파괴 검사 기술이다. 특히 광섬유 브래그 격자 센서는 그러한 대상체에 대한 비파괴 검사를 수행하는데 가장 적합한 센서이다. 광섬유 브래그 격자 센서는 그러한 대상체에 대한 비파괴 검사를 수행하는데 가장 적합한 센서이다. 광섬유 브래그 격자는 특정파장의 빛을 반사 또는 제거시키는 특성을 지니고 있으며, 스트레인 같은 물리량이 광섬유 브래그 격자에 가해지면, 반사되는 빛의 중심파장이 이동하여 이를 통해 물리량을 측정할 수 있다. 정ㆍ동적 스트레인을 측정할 수 있는 광섬유 브래그 격자 센서는 건축물이나 토목구조물 등의 안전 진단(health monitoring)을 위해 사용되고 있으며, 최근에는 도로나 교량과 같은 토목 구조물로의 응용에 있어서 필수적인 동적 스트레인의 측정에 대해 그 관심이 집중되고 있다. 본 연구에서는 패브리=페로(Fabry-Perot) 필터를 이용하여 다중점에서 동적 스트레인을 측정할 수 있는 센서 시스템을 제작하였으며, 제작된 센서 시스템을 모의 구조물(외팔보)에 적용하여 모의 구조물에 가해지는 정적, 동적 스트레인을 측정하였다. 측정 결과는 기존의 전기적 센서와 유사하였다. An optical fiber sensor is capable of nondestructive measurement of a structure and it has an advantage of the immunity to electromagnetic interference because light is not affected by electromagnetic wave. In addition, if optical fibers are buried in an object like a concrete, this sensor can analyze defects and physical status of the object without disassembling it. Especially, the fiber Bragg grating sensor is a promising optical fiber sensor capable of nondestructive test of such an object. A fiber Bragg grating has the characteristics of reflecting or blocking light of a specific wavelength. If we apply physical quantity like strain to the fiber Bragg grating, the center wavelength of the reflected light is shifted and then we can find the physical quantity applied to the fiber Bragg grating by measuring the center wavelength shift of the reflected light. The fiber Bragg grating sensor capable of static and dynamic strain measurement is being used in health-monitoring of buildings, structures, etc. Recently increasing is interest in dynamic strain measurement inevitable to the civil structures such as roads and bridges. In this study we implemented the optical fiber sensor system which can measure dynamic strain at multiple points using Fabry-Perot wavelength demodulation. And we measured the static and dynamic strain using this sensor system with a test structure(cantilever). Measurement results were similar to those obtained with the conventional electrical measurement methods.

알레르기성 비염 환자에서 절지동물성 특이항원의 양성율 및 항원간 일치율

황규윤,남해선,박준수,권준택,백병준,김장묵,오천환,조성란 순천향의학연구소 2000 Journal of Soonchunhyang Medical Science Vol.6 No.2

The current study was designed to evaluate the positive rates of arthropod allergens by Korean inhalant panel of MAST-CLA in patients with allergic rhinitis. One hundred sixty patients, diagnosed to allergic rhinitis in an Out Patient Center of Soonchunhyang University Chunan Hopsital during Aug 1998 to July 2000, were studied. 1. The overall positive rate among 35 specific allergens was 59.4% (95 patients). 2. The arthropod related allergen accounted for 82.1% (78 patients) of the positive rate. 3. Each positive rate of Dermatophagoides farinae (Df), Dermatophagoides pteronyssinus (Dp), house dust (Hd), and cockroach mix (Cm) was 45.0% (72 patients), 43.1% (69 patients), 28.1% (45 patients), and 8.8% (14 patients), respectively. 4.Significant agreement between arthropod allergens was observer (P < 0.05). 5. The obseved agreement between Df and Dp was 95.6%, showing most significant Kappa index (Kappa = 0.911, P < 0.001). There results suggested that although MAST-CLA is a useful measure of identifying specific allergens, the specificity of two mite allergen relatively low, implying because of common allergen between mites in Korean panel of MAST-CLA. Our data also supported that arthropod is the major cause of allergen in patients with allergic rhinitis, however, the MAST-CLA should be modified in order to exclude common allergen of mite and to include more specific mite allergen.

Natural History of Unruptured Intracranial Aneurysms : A Retrospective Single Center Analysis

Byoun, Hyoung Soo,Huh, Won,Oh, Chang Wan,Bang, Jae Seung,Hwang, Gyojun,Kwon, O-Ki The Korean Neurosurgical Society 2016 Journal of Korean neurosurgical society Vol.59 No.1

Objective : We conducted a retrospective cohort study to elucidate the natural course of unruptured intracranial aneurysms (UIAs) at a single institution. Methods : Data from patients diagnosed with UIA from March 2000 to May 2008 at our hospital were subjected to a retrospective analysis. The cumulative and annual aneurysm rupture rates were calculated. Additionally, risk factors associated with aneurysmal rupture were identified. Results : A total of 1339 aneurysms in 1006 patients met the inclusion criteria. During the follow-up period, 685 aneurysms were treated before rupture via either an open surgical or endovascular procedure. Six hundred fifty-four UIAs were identified and not repaired during the follow-up period. The mean UIA size was $4.5{\pm}3.2mm$, and 86.5% of the total UIAs had a largest dimension <7 mm. Among these UIAs, 18 ruptured at a median of 1.6 years (range : 27 days to 9.8 years) after day 0. The annual rupture risk during a 9-year follow-up was 1.00%. A multivariate Cox proportional hazards analysis revealed that the aneurysm size and a history of subarachnoid hemorrhage (SAH) were statistically significant risk factors for rupture. For an aneurysms smaller than 7 mm in the absence of a history of SAH, the annual rupture risk was 0.79%. Conclusion : In our study, the annual rupture risk for UIAs smaller than 7 mm in the absence of a history of SAH was higher than that of Western populations but similar to that of the Japanese population.

A Classification Scheme for Information and Telecommunications Technologies

Byoun, Bogyun,Bae, Moonsik,Youn, Cheong,Mirza, Misbah 충남대학교 기초과학연구소 1996 忠南科學硏究誌 Vol.23 No.2

Classification helps us assign knowledge and relationships to unknown objects and to structure domains of systematic inquiry. This is particularly applicable to the emerging new fields which are coming about as a result of the convergence of information and telecommunications fields. This paper looks at different classifications schemes which can be applied to these fields and suggests a suitable scheme with examples of its application to the above mentioned fields. The classification scheme presented is multi-dimensional. These dimensions are structural, commercial. and functional. They take into account aspects necessary in the classifications of such technologies. The scheme also incorporates some necessary aspects of software design process, namely, coupling and cohesion.

ACUTE ORAL TOXICITY ACCORDING TO OECD TG (TEST GUIDELINE) 423 OF NIKEL (Ⅱ) CHLORIDE AND SODIUM CHORMATE (Ⅳ) IN RATS

Byoun-Baek Seo,Eun-Hye Jo,Jae-young Choi,Eung-Roh Park,San-Hee Lee,Jun-Heyon Yoon,Kyung-hee Choi 한국환경독성학회 2009 한국독성학회 심포지움 및 학술발표회 Vol.2009 No.11

Multisensor Image Fusion and Efficient Road Detection Using KOMPSAT Imagery

Byoun, Seung Gun,Kim, Sung Chai,Lee, Kwae Hi 대한원격탐사학회 2001 International Symposium on Remote Sensing Vol.17 No.1

This work is composed of two different sections. One is a method to fuse low-resolution LANDSAT 7 multi spectral images and KOMPSAT panchromatic image based on robust wavelet transform method, and the other shows an efficient strategy for road detection using an ansotropic diffusion and the rotation filter using variance value to the original KOMPSAT panchromatic image. The proposal wavelet fusion approach finally generates the significant multi-sensor fused images with combined both spectral intermission from LANSAT 7 image and structure from KOMPSAT image. The experimental result of efficient road detection process shows superior automatic road detection than other methods for 2S6 by 256 KOMPSAT test images Keyword: additive wavelet method, fusion, anisotropic diffusion, KOMPSAT, road detection.

Disposable Technologies in Downstream Processing of Biopharmaceuticals

Byoun Soon Hwi 한국생물공학회 2010 한국생물공학회 학술대회 Vol.2010 No.10