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Kinetics and Mechanism of the Aminolysis of O-Methyl S-Aryl Thiocarbonates in Acetonitrile
오혁근 대한화학회 2011 Bulletin of the Korean Chemical Society Vol.32 No.5
The aminolysis of O-methyl S-aryl thiocarbonates with benzylamines are studied in acetonitrile at −45.0 ^oC. The βX (β_(nuc)) values are in the range 0.62-0.80 with a negative cross-interaction constant, ρXZ = −0.42, which are interpreted to indicate a concerted mechanism. The kinetic isotope effects involving deuterated benzylamine nucleophiles (XC_6H_4CH_2ND_2) are large, k_H/k_D = 1.29-1.75, suggesting that the N-H(D) bond is partially broken in the transition state by forming a hydrogen-bonded four-center cyclic structure. The concerted mechanism is enforced by the strong push provided by the MeO group which enhances the nucleofugalities of both benzylamine and arenethiolate from the putative zwitterionic tetrahedral intermediate
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활주방지장치(WSP)의 TSI 규격만족 현차시험 방법에 대한 연구
오혁근,김석원,김상수,이종섭 한국철도학회 2019 한국철도학회논문집 Vol.22 No.5
The WSP (Wheel Slide Protection) System of trains has a critical role in confirming safe braking performanceand preventing train accident due to flatting of wheels in low adhesion condition. In this study, the related TSIstandard for the performance evaluation of WSP is analyzed, and the relevant test items for vehicle and evaluation criteriaare presented. Also, in order to realize general low adhesion test condition among vehicle test items of WSP, awater spraying device was manufactured and it was confirmed that the flow rate of 7.3L/min meets the internationalstandard. In order to evaluate the performance of the WSP, the spraying device was installed on the test vehicle andemergency braking test was carried out at 120 and 160 km /h. As a result of the braking test, braking distance extensionwas 108%, relative air consumption values were 2.5 (120km/h) and 3.3 (160km/h), initial adhesion coefficient was0.062, and minimum slide values were 0.87 at 120km h and 0.89 at 160km /h. The test condition satisfying the criterionwas determined and soapy water concentration was 1.5%.
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오혁근 한국디지털디자인학회 2014 디지털디자인학연구 Vol.14 No.2
수학, 기하학, 미학으로 연결되어지는 역사적 맥락은, 수학의 엄격한 아름다움과 디자인•예술의 감성적인 정형성의 융합 가능성을 설명하는 단초가 된다. 소수(primes) 수열은 엄격한 규칙에 의존하는 여타 수학적 개념들과는 달리 무한성, 불규칙성, 단위속성 등의 특성을 지니기 때문에 우연적 패턴양식을 창출하고자하는 본 연구의 소재로 최적의 조건을 갖추고 있다. 예측 불가능한 수학적 요소에서 특정의미가 부여된 패턴양식을 창출하여 다양한 환경에 적용하는 작업은 디자이너에게 새로운 미적 가치창출의 기회를 부여하고, 사용자에게도 색다른 경험을 제공할 수 있다. 본 연구에서는 소수와 더불어, 원주율(π)과 같이 소수점 이하의 수가 특정 패턴이 없이 진행하는 무리수를 다양한 수학적 도구를 통하여 시각화한 후, 패턴과 보간곡선의 형상으로 결과물을 추출하여 디자인 환경에 적용하는 과정을 진행하였다. 그 결과, 무한수열의 무질서해 보이는 집합이 수학적 정량화 작업을 통하여, 패턴양식과 관계된 새로운 미적 경험을 창출하는 원동력이 될 수 있다는 가능성을 제시하였다. The historical context linked with mathematics, geometry, and aesthetics serves as a basis to explain the possibility of combining stern beauty of mathematics with sensitive conformality of design arts. Prime series, unlike other mathematical concepts that rely on strict rules, feature infinity, irregularity and unit attributes among others, offering optimal condition as a theme of this study intended to create accidental patterns. Creating a pattern given a specific meaning derived from unpredictable mathematical elements and applying it to various environments provide both designers and users with pleasant opportunities of creating new aesthetic values and having brand new experiences, respectively. This study has visualized irregular numbers such as pi(π) whose decimal place numbers feature irregularity, along with primes, using a variety of mathematical tools, extracted the outcomes in the form of patterns and interpolation curves and apply them to design environments. The results are found to demonstrate the possibility of seemingly disordered infinite sequences serving as a driving force to create unexpected aesthetic experience related to patterns created through mathematical quantification.
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오혁근 한국디자인리서치학회 2021 한국디자인리서치 Vol.6 No.2
Lego products, the representative of block toys, have reached beyond children's toys and hobbies of adults to create works of art or practical products, and block products that have the advantage of being able to freely repeat assembly and disassembly have the possibility of infinite creation. In this study, the development of a braille generating machine was carried out by focusing on the morphological similarity between blocks and 6-point braille among various application fields of block products. First, an efficient method of expressing braille was proposed, and after assembling a physical structure using Mindstorms EV3 and a technic bricks, a machine driving device was proposed that generates a designated braille by performing coding work to operate it. In the future, we look forward to the development of products with commodity value through continuous research on original practical products that take advantage of the brick's ability to assemble and disassemble. 블록완구의 대표라 할 수 있는 레고제품은 아동용 장난감이나 성인들의 취미를 넘어서 예술작품이나 실용적인 제품을 만들어내는데 이르렀으며, 조립과 분해를 자유롭게 반복할 수 있다는 장점을 지닌 블록제품은 무한창작의 가능성을 내포하고 있다. 본 연구에서는 다양한 블록제품의 활용분야 중에서 블록과 6점 점자의 형태적 유사성에 착안하여 점자생성 머신의 개발을 진행하였다. 우선 점자를 표현하는 효율적인 방법을 제안하고, 마인드스톰 EV3와 테크닉 브릭을 활용하여 물리적 구조를 조립한 후, 이를 작동시키기 위한 코딩작업을 진행하여 지정된 점자를 생성하는 기계구동 장치를 제안하였다. 향후, 조립 분해가 가능하다는 브릭의 장점을 활용한 독창적 실용제품들의 지속적인 연구가 이루어져 상품가치를 지닌 제품의 개발을 기대한다.
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Kinetics and Mechanism of the Aminolysis of Aryl N-Benzyl Thiocarbamates in Acetonitrile
오혁근 대한화학회 2011 Bulletin of the Korean Chemical Society Vol.32 No.1
The aminolysis reactions of phenyl N-benzyl thiocarbamate with benzylamines in acetonitrile at 50.0 ^oC are investigated. The reactions are first order in both the amine and the substrate. Under amine excess, pseudo-first coefficient (k_(obs)) are obtained, plot of k_(obs) vs free amine concentration are linear. The signs of ρXZ (< 0) are consistent with concerted mechanism. Moreover, the variations of ρX and ρZ with respect to the sustituent in the substrate and large ρXZ value indicate that the reactions proceed concerted mechanism. The normal kinetic isotope effects (k_H/k_D = 1.3 ~1.5) involving deuterated benzylamine nucleophiles suggest a hydrogen-bonded, four-centered-type transition state. The activation parameters, ΔH^‡ and ΔS^‡, are consistent with this transition state structure.
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