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장문석,이용호,강기중 한국기계기술학회 2017 한국기계기술학회지 Vol.19 No.5
The combustion instability in a dual swirl combustor was investigated experimentally. The effects of thermal power and combustor length on combustion instability were evaluated. Pressure and heat release fluctuation were measured simultaneously. In a conventional combustor, the frequency was decreased with increasing combustor length and decreasing thermal power. However, it showed different results with a dual swirl combustor. In regime 1 where thermal power was relatively high, the results showed same tendency with a conventional combustor. In regime 2 where thermal power was relatively low, the frequency was almost constant with increasing combustor length. It was found that a beating phenomenon occurred with increased combustor length in regime 2 by measuring sound pressure fluctuation. By confirming that beating phenomenon occurs only in regime 2, it is considered that beating phenomenon is the dominant factor of combustion instability in regime 2. This beating phenomenon inside combustion chamber greatly affected to combustion instability. The reason of the beating phenomenon seemed to be the difference oscillating period between main flame and pilot flame.
張文錫 國防大學校 1998 敎授論叢 Vol.13 No.-
한 나라의 군사사상은 삼당기간에 걸쳐 형성되는 산물이며 미래에도 그 영향이 반영된다. 현대 일본의 군사사상은 시대상황과 무기체계, 군사제도 등의 변화에 따라 과거 군국주의 군사사상과는 다르다고 보지만, 방위관, 용병사상, 전쟁지도 등의 근저에는 계속 영향을 미칠 수도 있다는 전제하에서 19~20세기 일본이 참가한 전쟁을 통하여 일본의 군사사상을 분석하였다. 제국주의 시대에 있어서 일본의 방위관은 자국영토를 방위하기 위한 ‘주권선’을 지키기 위해주변 영향지역인 ‘이익선’을 확보해야 한다는 논리 하에 그들의 이익선을 계속 확대해 나갔으며, 전쟁의 명분을 미화시키면서 실질적으로는 아시아의 맹주를 지향하여 비정의의 침략전쟁을 획책하였다. 전쟁지도는 군사가 정치에 우선하여 국방방침의 책정은 정부와 관계없이 통수부의 권한으로 결정되었다. 따라서 전쟁의 결정도 통수부가 주도함으로써 전쟁개시는 일본이 주도하였고 상대국의 무력을 격파하는 무력전 중심주의가 군사사상을 지배하였다. 용병사상면에서는 단기결전에 의한 속전속결전략, 기습공격을 수반하는 개전방식, 무자비한 전투행동은 전쟁수행의 특징으로 볼 수 있다. 군사사상의 또 하나의 특징은 정신적인 요소를 모든 면에서 강조하였다. 공격정신, 군기 등의 강령을 채택하고 천황의 군대로서 생명을 바쳐 맹종케 함으로써 인명을 경시하는 비인간적이고 잔인한 전투정신을 요구하였다. 이와 같은 과거 일본의 군사사상은 최근 일본의 군사대국화 성향에 경계심을 갖게 되는 이유 중의 하나로 고려되어야 한다.
고성능 DSP를 이용한 모터, 엔코더 성능평가 시스템 개발
장문석,심재홍,이응혁,최상방,Jang, Mun-Suck,Shim, Jae-Hong,Lee, Enug-Hyuk,Choi, Sang-Bang 한국반도체디스플레이기술학회 2009 반도체디스플레이기술학회지 Vol.8 No.4
In robot operation, a motor with multi-degree of freedom motion control and an encoder for motor control are needed. To perform precise motion, location, and velocity control, the operation of motor and encoder with superior performance is important. In this paper, we studied performance evaluation system that can evaluate the performance of motor and encoder. The performance of motor and encoder can be evaluated in terms of disconnection check, signal variation count, and U, V, W signal check. Disconnection check verifies signal connection between a motor and an encoder, signal variation check verifies A, B signal by counting the number of signal A, B when a motor revolves, and U, V, W signal check verifies operating direction of a motor. The result is shown at graphic LCD integrated in system, and can be checked in PC with PC communication.
장문석 구보학회 2017 구보학보 Vol.0 No.16
I examined relationship between socialism and statistics in colonial Korea reading ChoseonChiKwnag(The Light of Choseon), the socialist magazine. In Chapter 2, I examined the widespread use of statistics and mathematical thinking in colonial Korea during the early and mid-1920s. In Chapter 3, I examined the position of Marxist theory as the basis of scientific characteristic in the middle and late 1920s, and the colonial intellectuals, a subject of analysis, asked for knowledge about Choseon. In Chapter 4, I analyzed discourse practices through statistics by the writers of ChoseonChiKwnag(The Light of Choseon). ①Colonial socialists tried to do the discourse practice to make a counter interpretation through statistics. However, the access to the knowledge of statistics was limited to colonial subjects. The writers of ChoseonChiKwnag(The Light of Choseon), therefore, made a discourse practice of ②quotation of numbers, ③uninterpreated reprinting of statistics, and ④invitation of knowledge. Through the points discussed in this article, I intend to make it a future task to newly read the relationship between socialism and statistics in colonial Korea. 이 글은 1920년대 중후반 사회주의 잡지 『조선지광』을 대상으로 식민지 조선에서 사회주의와 통계의 관련성을 검토하였다. 2장에서는 1920년대 초중반 식민지 조선에서 통계와 수리적 사고가 널리 확산되었음을 살펴보았다. 3장에서는1920년대 중후반 『조선지광』을 대상으로 과학성의 근거로서 맑스주의의 이론의 위치를 살폈고, 이론이 분석 대상으로서 조선에 대한 지식을 요청하였고, 이 지점이 『조선지광』이 통계를 요청하는 장소(topos)임을 밝혔다. 4장에서는 구체적으로 『조선지광』의 필자들이 통계를 통해 수행한 담론적 실천을 분석하였다. 식민지 사회주의자들은 ①통계를 통한 대항해석에 가장 힘주어 담론적 실천을 수행하고자 하였다. 하지만 식민지 주체에게 통계라는 지식에 대한 접근은 제한이 있었으며, 그 결과 『조선지광』에서는 ②숫자의 인용, ③통계의 비해석적 전재(轉載), ④지식의 모집 등의 형태의 실천 또한 발견할 수 있었다. 이 글에서 파악한 논점을 경유하여, 식민지 조선에서 사회주의와 통계의 관계를 새롭게 읽어내는 것은 추후의 과제로 삼고자 한다.
장문석,박재현,김수태,김일곤,조성진 한국기계가공학회 2015 한국기계가공학회지 Vol.14 No.2
In this study, analysis and experiments were carried out on temperature distributions and thermal deformations in a dry vacuum pump with vertical screws for safe operation. When a vacuum pump is working, it is necessary to get rid of the heat generated by the friction of bearings and the compression of air to prevent the vacuum pump from being damaged by interference between two screws and housing through thermal deformation. Additional cooling was proposed by using oil flow through the inner channel of the rotating axis for lower temperature control of the vacuum pump. Analysis and experimental results were compared in terms of temperature distribution and thermal deformation of the vacuum pump, and two sets of results matched reasonably well. These results for a dry vacuum pump with vertical screws can be used in similar model development and can minimize errors in design and manufacture by providing reasonably accurate prediction in advance.
쇄양(鎖陽)의 Diphenyl-picryl-hydrazyl (DPPH) 소거 활성 및 HepG2 세포에 대한 항산화 효과
장문석,양웅모,김도림,박은화,박수연,박성규,Chang, Mun-Seog,Yang, Woong-Mo,Kim, Do-Rim,Park, Eun-Hwa,Park, Soo-Yeon,Park, Seong-Kyu 대한한의학방제학회 2007 大韓韓醫學方劑學會誌 Vol.15 No.2
The purpose of this study was to investigate the anti-oxidant effect of Cynomorium songaricum. The extract of Cynomorii Herba was studied for diphenyl-picryl-hydrazyl (DPPH) radical scavenging activity, HepG2 cell viability and $H_2O_2$-induced cytotoxicity by a modified MTT assay. DPPH radical scavenging activity was measured after 30 minutes. The extract was tested by 1. 5, 10, 50, 100 and 500 ${\mu}g/ml$ concentrations. HepG2 cell viability by a modified MTT assay was measured in the concentrations of 10, 50, 100, 250, 500 ug/ml for 24 h. The results showed that the extract scavenged DPPH radical up to 52.2% with 50 ug/ml concentration. The extract did not reduced the cell viability and $H_2O_2-induced$ cytotoxicity (69.4%) was blocked by the extract in the concentrations of 50, 100, 250 and 500 ${\mu}g/ml$. In conclusion, the extract of Cynomorii Herba has potent antioxidant activity.