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김동규,윤원식,Kim, Donggyu,Yoon, Wonsik 한국정보통신학회 2012 한국정보통신학회논문지 Vol.16 No.10
신호수신시스템은 수신신호의 주파수, 펄스변조, 스캔 변조, 펄스내 위상변조, 펄스내 주파수 변조 등 다양한 신호에 대한 측정 및 분석능력을 보유하여야 한다. 이러한 신호수신시스템의 성능을 평가하기 위하여 신호원들을 실험실 환경에서 효율적으로 모의발생하고 다수 전파가 존재하는 실제 운영환경과 유사한 복잡한 전파환경을 모의발생할 수 있는 효율적인 신호원 발생기를 제안한다. 제안한 모의전파신호원을 신호수신시스템 개발 전 과정에 걸쳐 활용할 경우 정확한 성능 검증 및 시험 비용을 절감할 수 있다. A signal receiving system can measure and analyze frequency, pulse modulation, scan modulation, frequency modulation on pulse, phase modulation on pulse of RF signal. A signal receiving system should be verified under simulated RF signal environment prior to verification on operation in fields. This paper describes an effective method to generate simulated RF signals with considering operational scenario. The simulated RF signal generator can be effectively used to evaluate the performance of the signal receiver and reduce the test cost of the signal receiver.
고유동 흙막이 벽체 재료의 역학적 성능 및 내구성에 대한 강섬유 혼입률의 영향
김동규,이승태,Donggyu Kim,Seungtae Lee 한국지반환경공학회 2023 한국지반환경공학회논문집 Vol.24 No.6
This paper is aimed to evaluate the mechanical properties and durability of high-flowable retaining wall material (RWM) with different levels of steel fiber (SF) content. To produce the specimens of RWM, some chemical agents such as superplasticizer (SP), air-entrained agent (AEA) and viscosity modifying agent (VMA) were added in the fresh RWM. The compressive and split tensile strength measurements were performed on the hardened RWM specimens at the predetermined periods. Additionally, surface electric resistivity and absorption tests according to ASTM standards were carried out to examine mechanical properties of RWM mixes. The durable performances such as chloride ions penetrability and freezing-thawing resistance of RWM mixes were experimentally investigated. As resutls, it was found that the performance of RWM mix with SF were much better than that without SF, especially at the 2% addition of SF. Thus, it is noted that the proper addition of SF in the RWM mix may have a beneficial effect to improve mechanical properties and durability of RWM mixes.
김동규 ( Kim Donggyu ) 국제비교한국학회 2016 비교한국학 Comparative Korean Studies Vol.24 No.3
현재 우리는 `우울 사회`에 살고 있다. 우리의 우울을 제대로 이해하기 위해서는 전통적인 한 담론과 서양의 멜랑콜리 담론을 비교해야 한다. 본 논문의 목적은 한과 멜랑콜리 담론을 간명하게 비교하고, 그 저변에 깔린 철학적 차이를 밝히는 데 있다. 특히 그동안 비교적 소홀히 다루었던 두 개념, 즉 한 담론의 핵심 개념인 `관계론`과 `삭임(발효)`에 대해 초점을 맞출 것이다. 본 논문은 신영복과 박동환의 핵심 아이디어를 중심으로 `실체론과 관계론의 대립지점`을 선명하게 부각시키고, 멜랑콜리의 애도작업과는 변별되는 `삭임의 고유한 메커니즘`에 초점을 맞추고 있다. 관계론에 따르면, 관계는 실체보다 앞서며 실체를 구성하는 일차적 원리다. 관계론은 사이, 소수자, 미완성, 주변부를 중시한다. 그리고 실체론이 개체의 독립성을 강조하는 반면, 관계론은 상호의존성을 강조한다. 존재하는 모든 것이 상호의존적이라면, 그것들의 존재방식은 기생적일 수밖에 없다. 그래서 멜랑콜리가 실체, 개체, 주체로 이어지는 독립적인 존재 특유의 정조라면, 한은 종국에 `붙음살이`를 벗어날 수 없는 생명 일반의 근본(보편) 정조다. 마지막으로 한 담론에서 애도작업에 해당하는 것이 삭임이다. 삭임을 통해 원한은 정한이 된다. 생물학적으로 보자면, 삭임이란 미생물의 비가시적 활동의 산물이다. 이런 점에서 멜랑콜리 담론의 애도작업이 한 개인의 정신적 승화에 가깝다면, 삭임은 비가시적타자들의 조력을 통해 일어나는 육화된 승화에 가깝다. Currently we live in a `depressive society`. In order to understand our depression existing in this society, it is necessary to compare the traditional Han(恨) discourse and the melancholy discourse from the West. The purpose of this paper is to compare the melancholy and Han subtly, and philosophically to elucidate differences between them. Especially we will focus on two core concepts of Han-discourse, that is to say, (1) `relation` and (2) `Sak-im`(fermentation), with which we have dealt neglectfully. I will try to contrast the world view(Weltanschauung) of substance with that of relation and make Shin, Young-Bok`s and Pak, Dong-Hwan`s philosophy a stepping-stone towards our study. According to the theory of relation, the relationship is the primary principle that constitutes substances and it precedes substances. A few concepts i.e. `between`, `minority`, `the unfinished`, `periphery`, etc. are considered as important in the theory of relation. While the independence is stressed in the theory of substance, the interdependence is emphasized in the theory of relation. If all things are interdependent, they must have a `parasitic mode of being`. Melancholy is the mood of independent being(substance, individuality and subject), while Han is the basic mood of every life that can not escape from the parasitic lifestyle. Finally, I will take a closer look at the appropriate mechanism of Sak-im that differs with the work of mourning in melancholy discourse. Sak-im is a fermentation. Biologically, it is a working of invisible microbe. While the work of mourning is close to a spiritual sublimation of the individual, Sak-im is akin to the embodied sublimation which can take place only through the assistance of invisible others.
토크 벡터링을 적용한 인휠 시스템 차량의 핸들링 특성 연구
김동규(Donggyu Kim),최승렬(Seung-ryul Choi) 한국자동차공학회 2018 한국자동차공학회 부문종합 학술대회 Vol.2018 No.6
High-tech battery and high-efficient electric motor make vehicle get changed and turned themselves out to be electrical. With this trend of vehicle development, In-Wheel System-ed Motor is being developed as a power source of Electrical Vehicle(EV). Because In-Wheel System-ed vehicle move their power source into each wheel, vehicle can improve handling performance, stability and chassis response by independent control of each wheel. So this system make driving and regenerative braking torque on each wheel independent by applying Torque Vectoring(TV). Which means vehicle can control their whole body phase by TV. It enable vehicle to get more active body control and improve handling performance than conventional AWD system. But force from road to axis of In-Wheel System make vibration for whole system. These unstability of axis cause NVH problem, fatigue, durability of bearing. And the idea and implementation of TV control algorithm are both complex. This paper classifies In-Wheel system-ed vehicle with dynamic bearing and gear model. We do simulation for mechanical load analysis of the In-wheel system and standard handling test of full-vehicle for verification of TV algorithm.