연속섬유가 보강된 2상 복합재료의 종방향 전단계수 해석

이동주,정태현,Lee, Dong-Ju,Jeong, Tae-Hyeon 대한기계학회 1996 大韓機械學會論文集A Vol.20 No.9

Longitudinal shear modulus of continuous fiber reinforced 2-phase composites is predicted by theoretical and numerical analysis methods. In this paper, circular, hexagonal and rectangular shapes of reinforced fiber are considered using unit cell concept. And fiber array is regular rectangular and hexagonal fiber arrangement. Longitudinal shear modulus is a function of fiber distribution pattern and fiber volume change. It is found that the rectangular array has a higher longitudinal shear modulus than the hexagonal one. Also, the rectangular fiber shape in lower fiber volume fraction and the circular fiber shape in higher fiber volume fraction show the higher longitudinal shear modulus. And it has been found that the theoretical and numerical predictions of the longitudinal shear modulus give a good agreement with the experimental data at lower fiber volume fraction. Both the distance and stress transfer between the fibers are discussed as the major determing factors.

표준화 포럼 탐방 - 5G 포럼

이동주,Lee, Dong-Ju 한국정보통신기술협회 2018 TTA저널 Vol.2018 No.-

IEA 가입과 석유비축

이동주,Lee, Dong-Ju 대한석유협회 2001 석유와 에너지 Vol.2001 No.1

구강내과 내원환자에 관한 역학조사 -충남지역에 대한-

이동주,김기석,Lee, Dong-Ju,Kim, Ki-Suk 대한안면통증구강내과학회 2006 Journal of Oral Medicine and Pain Vol.31 No.1

Temporomandibular disorders (TMD) is a collective term embrassing a number of clinical problems that involve the masticatory musculature, the Temporomandibular joint and associated structures, or both. The prevalence of signs and symptoms associated with TMD can be best appreciated by examining epidemiologic studies. But domestic epidemiologic studies about sex, history, chief complaint, diagnosis were not sufficient comparing with foreign countries. The results obtained as follow. 1. The number of visiting patients were 6500 and mean age was 34.06 year (Male's mean age was 33.15, Female's 34.62). In the age of patients, there was no significant difference between sex. 2. There are most patients who were referred by dentist (80.07%). Most diagnostic group was arthrogenous TMD group and followed by myogenous TMD, soft tissue disease. 3. There was strong interaction between diagnostic groups and chief complaint. 4. There was little pain difference between right and left sides. Male mainly had pain onset under 6 month, but female had pain onset more than 6 month. 5. The number of patients who had joint sound history were 3445 (53.15%). There was no significant difference of pain onset between sex. Clicking sound was most among joint sounds which happened to patients. 6. In analyzing the parafunctional habit, male mainly had bruxism, but female had clenching habit.

학술정담 공재 (恭齋) 윤두서의 (尹斗緖) 회화

이동주,최순우,안휘준 ( Dong Ju Lee,Soon Woo Choi,Hwi Jun Ahn ) 일지사 1979 韓國學報 Vol.5 No.4

고려시대의 불교회화

이동주,최순우,황수영,안휘준 ( Dong Ju Lee,Sun U Choi,Su Young Hwang,Hwi Joon Ahn ) 일지사 1979 韓國學報 Vol.5 No.1

광산수의 탈염을 위한 축전식 탈염기술의 적용

이동주,강문성,이상호,박진수,Lee, Dong-Ju,Kang, Moon-Sung,Lee, Sang-Ho,Park, Jin-Soo 한국전기화학회 2014 한국전기화학회지 Vol.17 No.1

본 연구에서 광산수의 재활용을 위해 축전식 탈염공정을 적용하였다. 이를 위해 이온교환폴리머를 코팅한 탄소 전극을 활용하였는데 본 성능을 관찰하기 위해 이온교환폴리머를 코팅하지 않은 탄소 전극으로 광산수의 탈염 운전을 수행하고 비교분석하였다. 또한, 광산수의 높은 농도가 축전식 탈염공정에 미치는 영향을 조사하기 위해 저농도의 기수(NaCl 200 ppm)를 활용한 운전 성능 비교 역시 수행하였다. 연구 결과 이온교환폴리머를 코팅한 탄소 전극을 활용한 광산수 탈염 효율 및 제거양 모두 그렇지 않은 전극에 비해 높았고 에너지 소모량은 더 적게 나타났다. 이는 높은 비패러데이 전류, 높은 염농도에 따른 낮은 용액 저항, 전극 기공 내에서의 이중층 중첩효과에 기인하는 것으로 판단되었다. 또한, 이온교환폴리머를 코팅한 전극을 활용한 기수 탈염 운전 결과 낮은 염농도에 따라 용액의 저항이 높아지고, 제거 대상의 염의 양이 낮아 광산수에 비해 매우 높은 효율을 보였으나, 제거양은 매우 낮음을 알 수 있었다. In this study, capacitive deionization (CDI) was introduced for desalination of mining water. Ion-exchange polymer coated carbon electrodes (IEE) were used in CDI to desalt mining water. The CDI performance using the IEE for desalination of mining water was carried out and then was compared with that using general carbon electrodes without ion-exchange polymer coating (GE). Moreover, to investigate the effect of the concentration of influent solutions on CDI performance, the CDI performance using the IEE for desalination of brackish water (NaCl 200 ppm) was also performed and analyzed. As a result, the higher salt removal efficiency, rate and the lower energy consumption in the CDI process using the IEE and mining water were obtained compared with those using the GE and mining water. It is mainly due to higher non-Faradaic current, low ohmic resistance of the influent, overlapping effect of electric double layers in micropore of the electrode. In addition, the CDI process using the IEE and brackish water shows much higher salt removal efficiency and lower salt removal rate than that using the IEE and mining water. This results from the lower concentration (i.e., higher ohmic resistance) and salt amount of the influent.

전자기 및 광학 센서를 적용한 무기체계의 강수 운용규격 설정을 위한 한반도 강수량 분포에 관한 연구

이동주,김재하,Lee, Dong-Ju,Kim, Jai-Ha 한국군사과학기술학회 2010 한국군사과학기술학회지 Vol.13 No.2

When a weapon system is developed, climate elements such as temperature, rainfall, and so on have an effect on development costs and a developing period. Therefore, effects of environment and climate must be examined throughly before the design of weapon systems and be applied to their developments. And so, operational and storage requirements for weapon systems are determined and are applied to related tests through analyzing not only environmental factors such as vibration, shock, and so on, but also climate factors. In this paper, the distribution and the frequency of occurrence of rainfall were analyzed and were suggested as a good guide to determine standards of tests for weapon systems when it's raining.

하이브리드 환기시스템의 운영 및 제어방식

이동주,Lee Dong-Ju 대한설비공학회 2006 설비저널 Vol.35 No.5

두 가지 유로 형태에 따라 이온교환수지를 채운 축전식 탈염기술

이동주,박진수,Lee, Dong-Ju,Park, Jin-Soo 한국전기화학회 2015 한국전기화학회지 Vol.18 No.1

일반적으로 저농도의 염 용액에서 탈염성능이 우수한 축전식 탈염기술에 고농도의 염을 함유한 용액을 처리할 수 있는 가능성을 확인하기 위해 spacer와 spiral 형태의 두 가지 모양의 유로에따라 이온교환수지를 채움으로써 탈염효율을 비교분석하고 기술의 적용가능성을 평가하였다. Spacer와 spiral 형태로 이온교환수지를 채운 축전식 탈염 셀의 탈염효율은 각각 77.21 및 99.94%로, 이는 spiral 형태의 유로에 채워진 이온교환수지가 유입수와 고르게 접촉할 수 있는 유로의 모양을 구성하기 때문에 많은 이온들이 제거될 수 있었다고 판단된다. 또한 pH와 축적 전하량의 변화량에서 탈염성능을 감소시킬 수 있는 페러데이 반응이 현저하게 줄어들었다. 따라서 본 연구를 통해 에너지효율적인 축전식 탈염 기술을 이용하여 고농도의 염 용액의 탈염에 대한 가능성을 제시해주었고, 이온교환수지의 혼합비율의 최적화와 연속식 전기탈이온 기술의 재생공정의 도입에 대한 추가적인 연구를 통해 이상적인 탈염기술을 개발하는 데 큰 기반이 될 것으로 기대된다. To desalinate the aqueous solutions with high salt concentration using the capacitive deionization technology, two resin/membrane capacitive deionization(RMCDI) cells were fabricated by filling mixed ion exchange resins in two different flow channels (spacer and spiral type). The salt removal efficiency of the spacer- and spiral-RMCDI was 77.21 and 99.94%, respectively. Many ions were significantly removed in a spiral RMCDI cell because the feed solution could be more evenly contacted with the ion exchange resins filled on the spiral type flow channel. As the result of the changes of pH and accumulative charges, it was observed that Faradaic reaction was diminished for a spiral RMCDI cell filled by the mixture of cation and anion exchange resins. Therefore, the desalination of the aqueous solutions with high salt concentration by the capacitive deionization technology was proven. In addition, further studies on the optimization of the mixing ratio with ion exchange resins and the introduction of the regeneration process generally occurred in the continuous electrodeionization (CEDI) technology are required to improve the RMCDI technology.