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Howang, Kyu Tak,Hong, Seok 大邱大學校再活科學硏究所 1981 再活科學 Vol.3 No.1
Semicarbazone의 置換基效果를 폴라로그래프의 피이크퍼텐셜과 UV의 λmax 으로 비교 설명되었으며, 또한 LUMO와 HOMO의 에너지와 관련지웠다. 이때 메틸기의 수가 증가할 수록 Semicarbazone의 환원성이 커졌으며, λmax은 장파장쪽으로 이동되었으나, Δm은 이외로 증가되었다. The effects of substituent groups of semicarbazones were compared with polarpgraphic peak potentials, λmx,s of UV, which were related to LUMO energy and HOMO energy difference, Δm. The substituent effects of semicarbazones show that the more increased the number of methyl group, the more easily reduced alkyl semicarbazones generally. λmax,s of alkyl semicarbazones also shifted to long wave, but Δm was increased exclusively.
실존주의 철학의 문명사적 독법 - 칼 야스퍼스의 존재의식과 실존적 역사성 -
전홍석 ( Jeon¸ Hong-seok ) 한국동서철학회 2020 동서철학연구 Vol.0 No.98
우리는 21세기 4차 산업혁명기에 직면해서 문명사적 변곡점, 위기, 불안, 또한 그와 연동하는 동아시아의 분열상을 극명하게 목도하고 있다. 무엇보다 현 동아시아권은 서구식 근대국가 세계시스템이 지배하는 사회이며 그에 동조하는 사유 없는 인간의 파시즘적 ‘악의 평범성(the Banality of Evil)’이 재현되고 있다는 데 경각심을 갖지 않을 수 없다. 본 연구에서는 1ㆍ2차 산업혁명이라는 세계문명사의 대변혁기에 발흥한 실존주의를 빅 히스토리의 문명사적 차원에서 해독, 그 해법의 실마리를 찾아보고자 했다. 그 구체적인 논지 전개는 먼저 실존주의 철학(실존철학)의 문명사적 독해를 수행하고 그러한 지평 위에서 칼 야스퍼스(Karl Theodor Jaspers, 1883~1969)의 실존ㆍ초월 지향적 역사철학이 계도하는 세계상과 그 현재적 의미 맥락들을 점검해보았다. 오늘날 문명사의 변곡점, 세계체제의 대변환기로 볼 때 20세기 전반 기계문명이나 근대국가 이데올로기에 치열하게 저항하고 대안을 궁구한 실존철학은 현대문명의 미래비전을 간직한 인문학적 보고이다. 특히 야스퍼스의 존재의식의 변혁, 곧 ‘실존적 역사성’은 인간부재의 어두운 디스토피아로 그려지는 4차 산업혁명과 이 시대의 난제들을 자극하는 유의미한 해법의 단서를 제공한다. 그가 개진하는 충실, 자유, 무제약성, 본래적 자기, 초월, 상호소통, 실존적 결단, 연대, 공동책임 등 인간상들은 21세기 메가트랜드 지구지역적(glocal) 평화협력과 그에 접속하는 동아시아 신문명시스템(new civilization system)을 구성하는 인간학적 모티프(motif)임은 물론이다. Confronting the age of the fourth industrial revolution in the 21st century, we are clearly witnessing the inflection point in the history of civilization, crisis, anxiety, and the dissolution of East Asia. Above all, East Asia currently has a society governed by the modern Western world system, and we must arouse attention to the fact that the fascistic, groundless ‘Banality of Evil’ is being reproduced to accord with these phenomena. This study aimed to interpret existentialism as an ideology that rose suddenly during those transition periods in the history of civilization called the first and second industrial revolutions and to find clues for such interpretation. In the development of the specific point, existential philosophy was read through the history of civilization. Based on this reading, the world view and present semantic contexts guided by the existence- and transcendence-oriented historical philosophy of Karl Theodor Jaspers(1883~1969) were examined. Looking at the inflection point in the history of civilization and the transition period of the world system, existential philosophy is a repository of humanities that cherishes the future vision of contemporary civilization by fiercely resisting and studying alternatives to the machine civilization from the 20th century and ideologies of modern countries. In particular, the revolution in the consciousness of existence by Jaspers or ‘existential historicality’ presents a meaningful clue to solve the conundrums of the fourth industrial revolution and present age illustrated as a gloomy dystopia with the absence of human beings. Human characteristics expressed by Jaspers; such as faithfulness, freedom, unconstrained nature, inherent self, transcendence, mutual communication, existential resolution, solidarity, and collective responsibility, are the humanistic motifs that constitute global cooperation for peace, the mega-trend of the 21st century, and the new civilization system of East Asia connected to the mega-trend.
다물리 시뮬레이션을 통한 차량용 압전 유압 완충기에 대한 연구
이홍석(Hongseok Lee),장홍석(Hongseok Jang),박종규(Jongkyu Park) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.5-3
A Piezoelectric Energy Harvesting Shock Absorber (PEHSA) System of a Vehicle is developed and analyzed. While driving a vehicle, only about 20% of fuel energy is consumed for driving to overcome air drag force and friction between the tires and the road. In particular, vibration energy caused by a bumpy road, vehicle speed, acceleration, deceleration, braking, steering, etc, is dissipated by shock absorber in the vehicle suspension. The objective of this paper is to develop a new suspension system of the vehicle including a shock absorber combined with piezoelectric materials as an energy harvester which transforms vibration energy to electrical energy. The multi-physics simulation was performed using Comsol Multiphysics for expecting the characteristics of the PEHSA system.
Hongseok Jang,서세관,조대성 국제구조공학회 2022 Steel and Composite Structures, An International J Vol.45 No.1
This study assessed the compressive and tensile strengths and modulus of elasticity of waste polyethylene terephthalate (PET) using the ASTM standard tests. In addition, short carbon and glass fibers were mixed with waste PET to examine the improvements in ductility and strength during compression. The bonding was examined via field-emission scanning electron microscopy. The strength degradation of the waste PET tested under UV was 40–50%. However, it had a compressive strength of 32.37 MPa (equivalent to that of concrete), tensile strength of 31.83 MPa (approximately ten times that of concrete), and a unit weight of 12–13 kN/m3 (approximately half that of concrete). A finite element analysis showed that, compared with concrete, a waste PET pile foundation can support approximately 1.3 times greater loads. Mixing reinforcing fibers with waste PET further mitigated this, thereby extending ductility. Waste PET holds excellent potential for use in foundation piles, especially while mitigating brittleness using short reinforcing fibers and avoiding UV degradation.
3D Moving Target Tracking Using TDoA and FDoA Measurements based on SIR Particle Filter
Hongseok Jung(정홍석),Jaebok Lee(이재복),Paulson Eberechukwu,Sunwoo Kim(김선우) 한국통신학회 2022 한국통신학회 학술대회논문집 Vol.2022 No.2
The accuracy of outdoor moving-target tracking systems usually suffers from ranging errors, sensor position, and velocity errors caused by low SNR (signal noise ratio) and non-line-of-sight (NLOS) conditions. In this paper, we propose a new method for moving-Target tracking using joint time-difference-of-arrival (TDoA) and frequency difference-of-arrival (FDoA) measurements. In this work, we introduce particle filter to fuse the interval measurement of TDoA and FDoA for estimating the velocity and position of a moving target. The particle filter plays a key role in the field of moving target detection and estimation, such as unmanned aerial vehicles (UAVs). The estimated interval must contain the actual values of the position and velocity of the moving target. The simulation is expected to improve the accuracy of the positioning performance while minimizing the sensor position and velocity error.
Augmented Reality Application for Automotive Industry
Hongseok Park,Yakov K. Yen 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_3
Competitiveness forces companies to invent more and more effective methods and tools for the planning of complex production systems. Virtual Reality technology introduced for design of manufacturing systems demonstrated a decrease in planning times as well as the improvement of the quality of planning results. Such introduction of various virtual planning tools implies the complete integration of all planning tasks and demands an intuitive interaction with complex computer models of factory layouts, equipment, facilities, etc. Known methods and tools are limited to a purely virtual representation of planning objects and thus require the complete 3D modeling of the whole manufacturing system. The high costs reduce the possible benefits of these tools and this technology in general. The technology of augmented reality (AR), as a new human-machine interface, introduces a noteworthy perspective for a new generation manufacturing system design. Using AR technology a physically existing production environment can be superimposed with virtual planning objects (3D CAD geometries). Planning tasks can thus be validated without modeling the surrounding environment of the production domain. In this paper we discuss the benefits of AR techniques in certain stages of manufacturing system planning activities and represent an application of AR technology in the field of Automotive Industry.