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Thienyl Pyrazoline 유도체의 가수분해 반응에 대한 속도론적 연구
이기창,강경묵,류정욱 明知大學校 産業技術硏究所 1997 産業技術硏究所論文集 Vol.16 No.-
Hydrolysis of thienyl pyazoline derivatives which is a species of five membered atomic heterocyclic compound was carried out and the reaction rate constants were measured. With the rate constants measured, the reaction mechanism and kinetics of the reaction were studied. With the rate constants measured, the reaction mechanism and kinetics of the reaction were studied. These compounds were hydrolysed in 20%(v/v) dioxane-H₂O solution at 25℃, and hydrolysis rate constants were measured over the range of pH 1.o~ 13.0 using UV. As a result, the reaction was confirmed as a irreversible first order reaction. Hydrolysis rate equation and reaction mechanism applicable over a wide pH range were proposed on the basis of the several results of rate constants, substituent effect, general base effect and identification of the hydrolysis reaction product.
장액성 경계성 난소 종양 환자에서 배변 후 실신으로 발현된 급성 중증 폐색전증
이정욱,김성훈,최상현,류지원,최대로,윤종우,최명진 조선대학교 의학연구원 2014 The Medical Journal of Chosun University Vol.39 No.4
Acute pulmonary embolism (PE) is a common and often catastrophic disease. Early diagnosis and treatment of PE is im-portant, however, prompt diagnosis is difficult due to nonspecific clinical manifestations. On the other hand, syncope may develop as a presenting symptom of PE, and defecation activity could trigger PE. In Korea, PE associated with defecation has not been previously reported. We report on a case of acute massive PE presenting as defecation syncope in a 26-year-old female with a serous borderline tumor of the ovary.
류정욱(Jung-Wook Ryu),이홍열(Hong-Yeol Lee),오세영(Se-Young Oh) 한국식품영양과학회 1999 한국식품영양과학회지 Vol.28 No.2
알긴과 키토산은 생분해성 천연고분자로 알려져 있다. PVA는 수용성 패킹, 종이, 섬유산업에서 사용한다. PVA/algin, PVA/chitosan필름을 생분해성 필름으로 사용하기 위하여 알긴, 키토의 무게혼합비율에 따라 용액블랜딩법에 의하여 제조하였다. 제조한 블랜드필름의 열적, 기계적 성질을 DSC, 인장강도, 신장강도와 SEM에 의한 형태 변화로 확인하였다. 결과적으로 10wt% PVA/chitosan일 때가 순수 PYA와 유사한 열적, 기계적성질을 가졌으며, PVA/algin은 알긴의 혼합비율이 25wt%를 넘으면 상분리현상을 나타내었다. PVA/Algin은 혼합비율이 10wt% 이내일 때 부분적인 상용성을 나타냄을 DSC, 기계적 성질과 SEM으로 확인하였다. TOC법에 의한 분해실험에서 블랜드필름은 pH 7.0, 10.0 완충용액에서보다 pH 4.0 완충용액에서 빠르게 분해가 일어났으며 pH 완충용액에서보다 효소용액에서는 더욱 빠른 분해를 나타내었다. Algin and chitosan are known as biodegradable natural polymers. PVA is useful for the production of water-soluble packaging, paper, textile sizes. PVA/Algin and PVA/chitosan films were prepared by solution blends method in the weight ratio of chitosan, algin for the purpose of useful biodegradable films. Thermal and mechanical properties of blend films such as DSC, impact strength, tensile strength and morphology by SEM were determined. As a result, The ratio of 10.0wt% PVA/chitosan films were similar to PVA at thermal and mechanical properties. PVA/Algin films were found that phase separation was occured as more than 25wt% increasing the blend ratio of algin. PVA/Algin films were observed to be less partially compatibility than 10wt% increasing the blend ratio of algin by DSC, mechanical properties and SEM. Blend films were completely degraded pH 4.0 better than 7.0, 10.0 in the buffer solution. Also, they were rapidly degraded in the enzyme(β-glucosidase) solution better than pH solution by enzymolysis.
1,3-Disubstituted Pyrido [2,3-d] Pyrimidinedione
류정욱,이기창,강삼룡 明知大學校 産業技術硏究所 1984 産業技術硏究所論文集 Vol.3 No.-
1,3-Disubstituted pyrido [2, 3-d] pyrimidine-2, 4-diones derivatives were synthesized by the following method A and B. Method A: 1-Substituted pyrido [2, 3,-d] pyrimidine-2, 4-diones were prepared by the reaction of 2-[N-substituted amino] nicotinic acid with urea at high temperature. On the other hand method B:1-Substituted pyrido [2, 3-d] pyrimidine-2 4-dione prepared by the reaction of 2-[N-substituted amino] nicotinamide with ethyl carbonate at low temperature. It was largely affected by catalyst and temperature that the synthesis of 2-[N-substituted amino] nicotinic acid as starting material, and amide of 2-[N-substituted amino] nicotinic and derivative was synthesized by the typical nucleophilic substitution of acyl halide. Considering the reaction time and temperature, however, it is clear that the method B is more efficient than the method A. The former requires only 2-3 hours of reaction time at 20-40℃, while the latter requires 7 hours at 180-200℃. Yields for two methods obtained were 60% all. Yields of 1, 3-disubstituted pyrido [2, 3-d] pyrimidine-2, 4-dione as object was obtained about 60% by the reaction of intermediate material with alkylated in the DMF solvent. It has been affirmed that the mechanism of reactions involved in synthesis was of nucleophilic substitution. The molecular structure, and molecular weight of 1, 3-disubstituted pyrido [2, 3-d] pyrimidine-2, 4-diones were confirmed by the analysis of physicochemical instrumentation such as IR, NMR, and Ms spectra, and the physical properties were examined.
송전선로 드론 순시·정밀점검 운용 및 공공용 드론길 구축방안에 대한 연구
우정욱,박준영,김석태,이재경,류서현,Woo, Jung-Wook,Park, Joon-Young,Kim, Seok-Tae,Lee, Jae-Kyung,Ryu, Seo-Hyeon 한국전력공사 2020 KEPCO Journal on electric power and energy Vol.6 No.3
KEPCO Research Institute developed a GIS-based autopilot drone inspection system for electric power facilities and since its pilot application in 2017, it has been successfully used to detect defects in power transmission lines. This paper presents how to operate this system in the field of power line inspection. Power transmission lines are located in a wide variety of environments such as plains, mountains, river crossings, sea crossings, and industrial areas. Among these, some transmission lines are difficult for human workers to access because of their geographies and some should be checked more often due to their severe contamination. Considering these field conditions, we classified drone operation in two categories to increase its effectiveness and efficiency - patrol surveillance and detailed inspection tasks. This paper describes the detailed procedures of the two tasks above and their field application experiences. In addition, this paper newly proposes how to construct public drone roads by using the information of KEPCO's power transmission lines.
류서현,박준영,김석태,이재경,고병성,우정욱 대한전기학회 2022 전기학회논문지 Vol.71 No.7
In this paper, we proposed a Beyond Visual Line Of Sight(BVLOS) drone system for inspection of transmission lines. As drone technology advances, drones are replacing dangerous tasks in the electric power industry. According to this trend, Korea Electric Power Corporation has developed the automatic inspection drone system for transmission lines. This system targeted inspection of transmission lines in the visible area. Since the transmission line is mainly located in mountainous area, the drone frequently enter the invisible area. In order to inspect multiple transmission lines with the existing system, frequent movement for drone takeoff and a lot of preparation time are required. To overcome this problem, we upgraded the existing system to inspect BVLOS transmission lines. For BVLOS flight, laws and regulations must be observed. Therefore, essential functions were derived from laws and regulations, and these functions were developed to be suitable for inspection of transmission lines. Finally, our system was verified through special flight approval from the Ministry of Land, Infrastructure and Transport. Through the new transmission line inspection drone system, the multiple transmission lines can be efficiently inspected at once.
초음파 분무 열 분해법을 통해 제조된 불소 도핑 된 주석 산화물 나노 입자의 전기화학적 특성
이도영,이정욱,안건형,류도형,안효진,Lee, Do-Young,Lee, Jung-Wook,An, Geon-Hyoung,Riu, Doh-Hyung,Ahn, Hyo-Jin 한국재료학회 2016 한국재료학회지 Vol.26 No.5
Fluorine-doped tin oxide (FTO) nanoparticles have been successfully synthesized using ultrasonic spray pyrolysis. The morphologies, crystal structures, chemical bonding states, and electrochemical properties of the nanoparticles are investigated. The FTO nanoparticles show uniform morphology and size distribution in the range of 6-10 nm. The FTO nanoparticles exhibit excellent electrochemical performance with high discharge specific capacity and good cycling stability ($620mAhg^{-1}$ capacity retention up to 50 cycles), as well as excellent high-rate performance ($250mAhg^{-1}$ at $700mAg^{-1}$) compared to that of commercial $SnO_2$. The improved electrochemical performance can be explained by two main effects. First, the excellent cycling stability with high discharge capacity is attributed to the nano-sized FTO particles, which are related to the increased electrochemical active area between the electrode and electrolyte. Second, the superb high-rate performance and the excellent cycling stability are ascribed to the increased electrical conductivity, which results from the introduction of fluorine doping in $SnO_2$. This noble electrode structure can provide powerful potential anode materials for high-performance lithiumion batteries.