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多目的 函數 最適化 方法을 고려한 트러스 構造物의 最適化에 관한 연구
柳熙仲 호남대학교 산업기술연구소 1995 산업기술연구논문집 Vol.2 No.-
本 硏究에서는 多目的 函數最適化 方法에 의해 서로 相沖되는 여러개의 目的函數를 갖는 트러스 構造物의 最適化 알고리즘을 誘導하고자 한다. 多目的 函數 最適化 方法에 의해 트러스 構造物의 最適化를 試圖하는 本 硏究에서는 設計變數로 部材의 斷面圖를 取하고 第1目的 函數로서는 體積을, 第2目的 函數로서는 第1目的 函數와 서로 相沖되는 變位을 取하며, 制約條件으로서는 應力 制約을 考慮해서 最適化 問題를 形成한다. 本 硏究에서는 加重値 方法(Weighting Method)을 適用해서 許容方向法에 의해 最適解를 求한다. 本 硏究의 알고리즘을 13部材 트러스 構造物에 適用하여 얻은 結果로부터 本 硏究에서는 다음과 같이 要約할 수 있다. 1) 本 硏究의 方法은 設計基準이 各各 다른 여러 가지 部分 構造로 이루어진 複雜한 構造物의 最適設計에 適合하다. 2) 서로 相沖되는 多目的 函數를 갖는 最適設計에서 最適解는 加重値에 따라 다름을 알 수 있다. This study aims at development of algorithm for the optimization of truss structures having several conflicting objectives by means of Multi-Objective optimization method. This study utilizing the Feasible Direction method. design variables are taken as the cross sectional areas of truss members, volume as the first objective function and displacement conflicting with the first objective function as the second objective function. The algorithm in this research is numerically tested for truss structure having the thirteen members. The numerical results can be summarized as 1) The algorithm in this approach is suitable for optimization of complex structures with conflicting design criteria. 2) The optimun solution differs according to weighting factors in optimum design problem having several conflicting objectives.
수열합성 공정으로 합성된 산화갈륨의 상변화에 따른 광촉매 특성
류희중,김선재,이인규,오훈정,황완식,Ryou, Heejoong,Kim, Sunjae,Lee, In Gyu,Oh, Hoon-Jung,Hwang, Wan Sik 한국반도체디스플레이기술학회 2021 반도체디스플레이기술학회지 Vol.20 No.2
GaOOH is obtained via hydrothermal synthesis procedure. The formed GaOOH is turned into α-Ga<sub>2</sub>O<sub>3</sub> at 500℃ annealing. As the annealing temperatures increase the α-Ga<sub>2</sub>O<sub>3</sub> is in part turned into β-Ga<sub>2</sub>O<sub>3</sub> and fully turned into β-Ga<sub>2</sub>O<sub>3</sub> after 1100℃. XPS and PL results reveal that heterojunction interface between α-Ga<sub>2</sub>O<sub>3</sub> and β-Ga<sub>2</sub>O<sub>3</sub> become maxim at 500℃ annealing condition, which result in the highest photocatalytic activity. The presence of heterojunction interface slows down the recombination process by separating photogenerated electron-hole pairs and thereby enhance the overall photocatalytic activity.
류희중,이원재,유대현,박병윤 대한성형외과학회 2004 Archives of Plastic Surgery Vol.31 No.4
Zygoma fracture is very common in facial trauma because zygoma composes a prominent part of the midface. For the zygoma fracture, its precise reduction and fixation is very important to prevent residual facial asymmetry. There are various modalities of treatment of fractured zygoma and now open reduction with multiple rigid fixation technique is widely accepted. The method of internal fixation enables accurate reduction and stable fixation. However, closed reduction can be used in simple and uncomminuted cases. Although the closed reduction has some advantages of simplicity, it has lost popularity because of the inadequate mechanical fixation and poor visualization. We designed an improved technique of the closed reduction and fixation using double Kirschner's wires. 19 patients were treated with this technique and all cases showed successful results without any complications. The potential advantages of this technique include simple procedure, short operation time, less incisional scar and soft tissue violation and fairly low price without use of foreign materials like miniplates. We conclude that double Kirschner's wire suspension technique is a simple and effective method in the treatment of uncomminuted zygoma fracture.
산화 그래핀을 이용한 구리이온 흡착과 투과도 특성을 이용한 구리이온 농도 실시간 측정
김승두,류희중,오훈정,황완식,Kim, Seungdu,Ryou, Heejoong,Oh, Hoon-Jung,Hwang, Wan Sik 한국반도체디스플레이기술학회 2021 반도체디스플레이기술학회지 Vol.20 No.2
Various Cu ions are discharged into water from various industries, which results in a severe trouble for groundwater, soil, air, and eventually animals and humans. In this work, graphene oxide (GO) is introduced as a Cu removal absorber and the real-time monitoring method is demonstrated. The results show that GO is a very effective material to absorb Cu ions in the solution. In addition, the residual Cu ions in the solution is monitored via optical transmittance method, which well match with Inductively Coupled Plasma Mass Spectrometer (ICP-MS) analysis.
산화갈륨 나노구조 광촉매 특성을 이용한 이산화탄소 저감 및 에틸렌 생성 작용
서다희 ( Dahee Seo ),류희중 ( Heejoong Ryou ),서종현 ( Jong Hyun Seo ),황완식 ( Wan Sik Hwang ) 한국전기전자재료학회 2022 전기전자재료학회논문지 Vol.35 No.3
Ultrawide bandgap gallium oxide (Ga<sub>2</sub>O<sub>3</sub>) semiconductors are known to have excellent photocatalytic properties due to their high redox potential. In this study, CO<sub>2</sub> reduction is demonstrated using nanostructured Ga<sub>2</sub>O<sub>3</sub> photocatalyst under ultraviolet (254 nm) light source conditions. After the CO<sub>2</sub> reduction, C<sub>2</sub>H<sub>4</sub> remained as a by-product in this work. Nanostructured Ga<sub>2</sub>O<sub>3</sub> photocatalyst also showed an excellent endurance characteristic. Photogenerated electron-hole pairs boosted the CO<sub>2</sub> reduction to C<sub>2</sub>H<sub>4</sub> via nanostructured Ga<sub>2</sub>O<sub>3</sub> photocatalyst, which is attributed to the ultrawide and almost direct bandgap characteristics of the gallium oxide semiconductor. The findings in this work could expedite the realization of CO<sub>2</sub> reduction and a simultaneous C<sub>2</sub>H<sub>4</sub> production using a low cost and high performance photocatalyst.
류선무(Ryusunmoo),김성기(Kimsunggi),박영일(Parkyoungil),류희중(Ryuheejung) 한국농어촌관광학회 2002 농어촌관광연구 Vol.9 No.1
This study has aims as follow: to renew our perception of the importance of farm village in order to activate rural areas; to understand the function and role of agricultural circumstances; to make clear the background from which Green Tourism has appeared and the relation of Green Tourism with national life; to elicit how to use land systeqlatically, how to secure stable income If rural areas and activate these areas, how to make comfortable living environment, how to make multilayered public function in rural areas, how to define agriculture as the sixth industry and how to present the ways to administer agriculture from several perspectives.<br/> <br/>