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.

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.

현민 지브이티(GVT) 크라이오 펌프 이야기

이동주,Lee, Dong Ju 한국진공학회 2015 진공 이야기 Vol.2 No.3

Cryopump(cryogenic pump), with integrating cryogenic skills into vacuum technology, is the most popular high vacuum pump system, which is widely used at the commercial vacuum industries with TMP. Hyunmin GVT, Inc. is the domestic unique professional manufacturer of the cryopump systems. About ten years ago, while GVT succeeded in domestically producing cryopump systems, this high technology initiated from US became localized completely. But the process of the home production was not easy. It was possible through many trials and errors and after efforts and sacrifices of our engineers. Now many users and customers have the benefit of the advantage and excellence of the domestic cryopump systems. Especially, these days GVT is conducting researches and developments regarding low vibration cryopump and large-sized CWPs and Cryo-TMPs.

컨테이너 운반선 해치-커버 제작시 전 굽힘 변형 거동에 관한 연구

이동주,김경규,신상범,Lee, Dong-Ju,Kim, Gyung-Gyu,Shin, Sang-Beom 대한용접접합학회 2010 대한용접·접합학회지 Vol.28 No.4

The purpose of this study is to establish the control method of the global bending distortion caused by fabrication process of hatch-cover in a container ship. In order to do it, the transitional behavior of global bending distortion in the deck of hatch-cover during fabrication process was measured by 3-dimensional measuring instrument. From the results, the principal factor controlling the global bending distortion was identified as the bending moment associated with the longitudinal shrinkage force and transverse shrinkage caused by welding and flame heating and the change of the centroid axis of hatch-cover in each fabrication process. Therefore, in this study, with the predictive equations of the longitudinal shrinkage force and transverse shrinkage caused by welding and flame heating and the simplified thermo elastic method, the predictive method for the global bending distortion was established and verified by comparing with the measured result. Based on the results, the amount of reverse bending distortion of main stiffeners was determined to prevent the global bending distortion of hatch-cover.

임베디드 시스템을 위한 실시간 함수형 반응적 프로그램 변환기

이동주,우균,Lee, Dong-Ju,Woo, Gyun 한국정보처리학회 2006 정보처리학회논문지 A Vol.13 No.6

함수형 반응적 프로그래밍(FRP: Functional Reactive Programming)은 하스켈(Haskell)에 내장된 언어로서 두 핵심 고차 타입인 행위(Behavior)와 이벤트(Event)를 기반으로 반응적 시스템을 선언적으로 프로그래밍 한다. 이 논문은 다양한 제약사항을 가진 임비디드 시스템에 FRP를 이용하기 위해 실시간 함수형 반응적 프로그래밍(RT-FRP: Real-time Functional Reactive Programming) 변환기를 설계하고 구현한다. RT-FRP 변환기는 RT-FRP 언어의 기능적 의미론을 기반으로 RT-FRP 프로그램에서 C 프로그램을 생성한다. RT-FRP 변환기의 효과적인 변환을 입증하기 위해, 변환기에서 생성된 테스트 프로그램을 실제 임베디드 시스템, 레고 마인드스톰(LEGO Mindstorm)에 탑재하고 수행하였다. 실험 결과, RT-FRP를 이용할 경우 목적파일의 크기가 조금 증가하였으나 명령형 언어를 이용한 프로그램 보다 간결하게 반응적 시스템 소프트웨어를 프로그래밍 할 수 있었다. FRP(Functional Reactive Programming) is a kind of embedded language in Haskell, it declaratively program reactive system based on two essential high-order types named behavior and events. This Paper design and implementation RT-FRP(Real-time Functional Reactive Programming) translator for using FRP in embedded systems with many constraints. The RT-FRP translator generates a C Program from an RT-FRP program according to the operational semantics of the RT-FRP language. To show the effectiveness of the RT-FRP translator, we loaded and executed the test program generated by the translator onto a real embedded system, LEGO Mindstorm. According to the experimental result, the reactive system software can be programmed more concisely using RT-FRP than using an imperative counter part although the size of the binary code is rather increased.

Butyl 고무에 관(關)하여

이동주,Lee, Dong-Ju 韓國고무學會 1968 엘라스토머 및 콤포지트 Vol. No.

고속압밀법에 의해 제작된 유리섬유강화 PET 기지 복합재료의 최적제작조건

이동주,신익재,김홍건,Lee, Dong-Ju,Sin, Ik-Jae,Kim, Hong-Geon 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.5

Glass fiber reinforced PET matrix composite was manufactured by rapid press consolidation technique as functions of temperature, pressure and time in pre-heating, consolidation and solidification stages. The optimal manufacturing conditions for this composite were discussed based on the void content, tensile, interlaminar shear and impact properties. In addition, the levels of crystallinity with various manufacturing conditions were measured using differential scanning calorimetry to investigate the mechanical properties of this composite material as a function of crystallinity. Among many processing parameters, the mold temperature and the cooling rate after forming were found to be the most critical factors in determining the level of crystallinity and mechanical properties. The level of crystallinity affects the tensile properties to some degree. However, impact properties are affected much more. It also affects the degree of ductility, which determines the impact energy of this material.

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.

하이브리드 환기시스템의 운영 및 제어방식

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

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