A study of the kinematic characteristic of a coupling device between the buffer system and the flexible pipe of a deep-seabed mining system

오재원,이창호,홍섭,배대성,조효제,김형우 대한조선학회 2014 International Journal of Naval Architecture and Oc Vol.6 No.3

This paper concerns the kinematic characteristics of a coupling device in a deep-seabed mining system. This coupling device connects the buffer system and the flexible pipe. The motion of the buffer system, flexible pipe and mining robot are affected by the coupling device. So the coupling device should be considered as a major factor when this device is designed. Therefore, we find a stable kinematic device, and apply it to the design coupling device through this study. The kinematic characteristics of the coupling device are analyzed by multi-body dynamics simulation method, and finite element method. The dynamic analysis model was built in the commercial software DAFUL. The Fluid Struc-ture Interaction (FSI) method is applied to build the deep-seabed environment. Hydrodynamic force and moment are applied in the dynamic model for the FSI method. The loads and deformation of flexible pipe are estimated for analysis results of the kinematic characteristics.

심해저 채광 시스템에서 유연관의 안정적인 운용을 위한 부력재 배치 설계

오재원,민천홍,이창호,홍섭,배대성,임준현,김형우 한국해양과학기술원 2015 Ocean and Polar Research Vol.37 No.2

This paper focuses on the efficient arrangement plan of buoyancy modules, which plan is used to secure the safe operation and structural stability of a marine riser. The marine riser is connected between a vessel and seabed devices. The movement of the vessel and the seabed devices are affected by the motion of the riser. The riser of a deep-seabed integrated mining system exerts a strong influence on the healthy transfer of minerals. So, buoyancy modules must be equipped to compensate for the proble which is the structure stability and the dynamic motion. Installation locations and quantities of the buoyancy modules are determined by real sea experiments. But this is not easy to do because in real sea experimental conditions the cost is expensive as well as being, time-consuming and dangerous. Therefore, the locations and quantities should be determined by numerical simulation. This method is called simulation-based design. The dynamic analysis models of the riser and the buoyancy modules are built into the commercial software of DAFUL.

高濃度電解液領域에 있어서 鉛蓄電池의 諸特性에 關한 硏究

吳在元 大田開放大學 1986 論文集 Vol.5 No.-

Battery capacity increased and decreased with rise and falls in battery temperature, the rate of change becoming higher with higher electrolyte concentration. The rate for negative electrodes was higher than that for positive electrodes. The self-discharge rate for negative electrodes was higher than that for positive electrodes, and was extremely high for both electrodes in electrolytes with a specific gravity of above 1.45 (20℃). Battery life was reduced as electrolyte concentration increased, becoming extremely short as the specific gravity of the electrolyte exceeded 1.30-1.35 (20℃). This was mainly due to softening of positive active material which occurred early in the cycling life test. Other factors in the electrode manufacturing process that might be considered to influence battery life were also studied, including the kind of lead oxides, the amount of sulfuric acid for pasting, and conditions of electrode curing after pasting, but their influences were found to be negligible.

늑대의 리더뽑기

오재원 기술표준원 2008 기술표준 Vol.79 No.-

TRIZ를 활용한 설계AE의 효율적 추진방안

오재원,김광수 한국품질경영학회 2011 한국품질경영학회 학술대회 Vol.2011 No.2

電解液 濃度變化에 따른 鉛蓋電池의 容量特性에 관한 硏究

吳在元 大田開放大學 1985 論文集 Vol.3 No.-

It is well known that the capacity of a lead-acld battery varies greatly with the change in the concentration of Its electrolyte, and studies were thus made of the relation between electrolyte concentration and capacity, In conjunction with the effects of positive and negative plates, the kinds of plates, discharge current densities and changes In electrolyte concentration during discharge. The results of these studies were discussed, taking into considerations the results of surface observation and specific surface area measurements of the plates. It was thus determined that lead-acid battery capacity was dependent not simply on the concentration, but also related to factors mentioned above. Specifically, during discharge the lead sulfate crystals were smaller, the higher the electrolyte concentration and the discharge current density, while electrolyte diffusion was insufficient when the concentration was too low both of factors adversely affecting battery capacity. Thus, it was found that there is an electrolyte concentration which will yield the maximum capacity under each combination of conditions.

한국 공중화분의 특징과 최근의 변화

오재원 대한천식알레르기학회 2007 천식 및 알레르기 Vol.27 No.1

非對稱 Carbenoid 反應

吳在元 大田開放大學 1985 論文集 Vol.2 No.-

乳化型 液膜을 利用한 銅 電解 廢液中의 Ni(Ⅱ) 回收에 관한 硏究(Ⅰ)

오재원 大田産業大學校 1995 한밭대학교 논문집 Vol.12 No.0202

This experimental investigation was performed for the recovery of Ni(Ⅱ) in the external aqueous phase in terms of novel liquid surfactant membrane(w/o/w emulsion type) by employing the carrier mediated counter transport mechanism in a batch operation. In this experiment PC88A, Span80, Kerosene and H_2SO_4 were used as a extractant(carrier), a surfactant, a solvent(membrane) and a stripping reagent respectively. From the results of this study, the following were drawn as a conclusion. (1) The extent of extraction increased with an increase in the concentration of Ni(Ⅱ), and the recovery efficiency of Ni(Ⅱ) increased with increasing the concentration of Ni(Ⅱ), and the recovery efficiency of Ni(Ⅱ) was achieved when the sulfuric acid concentration was 1 N. The optimum condition for the Ni(Ⅱ) extraction was as follows: Intial Ni(Ⅱ) concentration : 300 ppm. H_2SO_4 concentration :1 N PC88A concentration 10% by volume Within the experimental condition of this study (2) The optimum condition for the stability of liquid sufactant membrane and the separation of Ni(Ⅱ) was as follows: Span 80 concentration : 4% by volume. Liquid paraffine concentration : 3% by volume. Stirring speed 3,000rpm (3) In the above optimium condition, the recovery efficiency of Ni(Ⅱ) was above 80% within 15minutes from 300 ppm Ni(Ⅱ) aqueous solution. (4) Liquid membrane was Protected enoughly from the breakage by the addition of Span 80(4 Vol.%) and liquid paraffin(3 vol.%) in the kerosene membrane.

1995년과 2000년의 학동기와 2003년 학동전기 소아에서의 아토피피부염의 역학적 변화에 관한 전국적인 연구

오재원,김규언,편복양,이혜란,정지태,홍수종,박강서,이수영,송상욱,김철홍,안강모,남승연,손명현,김우경,이미희,권병철,최성연,이소연,이하백,이상일,이준성 대한 소아알레르기 호흡기학회 2003 Allergy Asthma & Respiratory Disease Vol.13 No.4

Nationwide Study for Epidemiological Change of AtopicDermatitis in School Aged Children between 1995 and 2000 andKindergarten Aged Children in 2003 in KoreaJae-Won Oh, M.D.1, Kyu-Earn Kim, M.D.2, Bok-Yang Pyun, M.D.3, Hae-Ran Lee, M.D.4, Ji-Tae Choung, M.D.5, Soo-Jong Hong, M.D.6, Kang-Seo Park, M.D.7, Soo-Young Lee, M.D.8, Sang-Wook Song, M.D.9, Chul-Hong Kim, M.D.10, Kang-Mo Ahn, M.D.11, Seung-Yeon Nam, M.D.12, Myung-Hyun Shon, M.D.2, Woo-Kyung Kim, M.D.12, Mee-Hee Lee, M.D.13, Byung-Chul Kwon, M.D.2, Sung-Yeon Choi, M.D.2, So-Yeon Lee, M.D.6, Ha-Baik Lee, M.D.1,Sang-Il Lee, M.D.11, and Joon-sung Lee, M.D.13 목 적 : 최근 세계적으로 아토피피부염과 함께 여러 알레르기질환의 유병률이 증가하는 추세이며, 특히 소아에서의 발병률은 성인에 비해 훨씬 높은 것으로 알려져 있다. 구미, 유럽에서의 유병률이 매우 높으며 이러한 추세는 치료와 예방이 개선되고 있음에도 불구하고 계속 증가하고 있다. 이에 저자들은 대한소아알레르기 및 호흡기학회 주관으로 1995년과 2000년 초등학생과 중학생, 그리고 2003년 유치원생을 대상으로 전국적인 아토피피부염 유병률의 역학적 변화와 서울과 지방과의 유병률의 차이를 알아보고 아토피피부염을 유발하거나 악화시킬 수 환경적 요인에 대하여도 알아보고자 하였다.방 법 : 1995년과 2000년에 동일한 설문방법을 이용하여 서울과 지방으로 크게 두 군으로 분류하고 나이별로는 초등학생 6-12세군과 중학생 13-15세군으로 분류하여 설문 조사하였으며, 설문 내용은 ISAAC 프로토콜을 한국어로 번역하였으며 일부 환경 설문은 국내현실에 맞게 추가하여 사용하였다. 대상자수는 1995년 조사에서 총인원 40,429명이었으며, 2000년 조사에서는 총인원 42,202명이었으며 2003년 조사에서 유치원생수는 총인원 725명이었다. 설문방법은 유치원생, 초등학생은 부모나 보호자가 응답하였으며, 중학생은 학생 본인이 응답하였다.결 과 : '지금까지의 아토피피부염'에 대한 유병률은 총인원에 대한 통계는 1995년에 비해 2000년에 유병률이 6-12세와 12-15세 모두에서 증가되었으며, '지난 12개월 동안 아토피피부염'의 발병률에서도 1995년에 비해 2000년에 대상 모든 연령에서 증가되었다. 서울이 지방에 비해 '지금까지 아토피피부염' 유병률과 '지난 12개월 동안 아토피피부염' 발병률이 1995년과 2000년 모두 높게 나타났으며, 진단율과 치료율도 서울이 지방에 비해 높게 나타났다. 1995년과 2000년에서 6-12세에서 여학생이 남학생에 비해 높은 진단율을 나타냈다. 나이에 따른 유병률은 1995년과 2000년에 서울과 지방에서 5세에서 가장 높은 유병률을 보이고, 나이가 많을수록 유병률이 감소되었다. 한편 부모의 알레르기질환과 아토피피부염 병력이 자녀의 아토피피부염 진단율에 의미있게 영향을 미치는 것으로 나타났다.