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자동차 현가장치인 Lower Control ARM의 다목적 최적설계 적용에 관한 연구
박남신,이동화,이강영,박영철 동아대학교 생산기술연구소 2002 生産技術硏究所硏究論文集 Vol.7 No.2
It's difficult to design existing parameter design in optimal design of complicated three dimension construction . So in this study, we established the same multi-step optimal design process as multi-objective optimal design using topological design and robust design technique methods, By the optimized design of third dimension construction which has various characteristics that may occur in actual spot, the weight of Lower control Arm that is not satisfied with design standard of the initial model is reduced by 30% more than the early model through the multi-object optimal design
莞島地域에 分布하는 深成火成岩類에 대한 岩石學的 및 地球化學的 硏究
申仁鉉,朴南臣 조선대학교 기초과학연구소 1992 自然科學硏究 Vol.15 No.1
This study is petrological and geochemical results of plutonic igneous rocks distributed in the wando area. Plutonic igneous rocks is classified into granitic gnesis, granite, diorite, micrographic granite, quartz-porphry by production state and mineral composition in study area. The area of granodiorite includes granitic gnesis and granite, that of granite does micrographic granite and quartz pophyry, and that of diorite and gabbro includes diorite by Mode and Norm analyses of them. Micrographic granite of a kind of plutonic rocks is distributed far and wide in this study area. Probably micrographic granite is plutonic rocks produced at compressional plate margin and boundary as 61.2% of Calc/Alkaline values. Micrographic granite includes relative alkali rich or intermediate alkali field by relation chart of alk to al according to the values of Niggli, and is magma type applicable to the area of salic by that of fm to al. Micrographic granite kinds of is granites of Ⅰ-type by the relation chart of Na_2O and Micrographic granite shows eruption peculiarity of Calc-Alkaline magma by Harkers oxide to sillica variation and AFM figures.
LiFePO<sub>4</sub>와 Li<sub>4</sub>P<sub>2</sub>O<sub>7</sub>의 <sup>7</sup>Li MAS NMR 특성 연구
한덕영,박남신,이상혁,이학만,김창삼,Han, Doug-Young,Park, Nam-Sin,Lee, Sang-Hyuk,Lee, Hak-Man,Kim, Chang-Sam 한국결정성장학회 2011 한국결정성장학회지 Vol.21 No.1
[ $^7Li$ ]Magic Angle Spinning(MAS) NMR Spectroscopy를 활용하여 $Li_4P_2O_7$와 $LiFePO_4$ 물질에서 $^7Li$ 핵의 NMR 특성 및 화합물 분자내의 국부적 구조 연구를 수행하였다. $Li_4P_2O_7$와 $LiFePO_4$ 물질 연구는 리튬이온전지에서 고체-전해질 경계상(SEI, solid-electrolyte interphase) 물질 연구를 위한 것이다. $Li_4P_2O_7$와 $LiFePO_4$ 분말은 고상합성법으로 제조하였다.$^7Li$MAS NMR 실험은 $27^{\circ}C$에서 $97^{\circ}C$의 영역에서 변온 실험을 수행하였으며 이는 주변 온도 변화 환경에서 $Li_4P_2O_7$ 물질 내의 Li 핵의 구조 변화를 관찰하기 위한 것이다. $^7Li$ MAS NMR 측정 결과 시료 온도가 $27^{\circ}C$에서 $97^{\circ}C$의 온도 분포 영역에서는 $Li_4P_2O_7$ 물질 내부의 Li 핵은 구조적으로 변화하지 않는 것이 확인되었다. 금번 실험을 통하여 $LiFePO_4$ 분말에 5.0 wt%이내로 포함되어있는 $Li_4P_2O_7$ 물질의 $^7Li$ MAS NMR 신호를 측정할 수 있는 측정 조건을 알았다. [ $^7Li$ ]Magic Angle Spinning (MAS) NMR spectroscopy has been used to study the lithium local environments in $Li_4P_2O_7$ and$LiFePO_4$ materials. The purpose of this study was to know the structure of the solid electrolyte interphase (SEI) in lithium ion cells composed of $LiFePO_4$ as cathode material. $Li_4P_2O_7$ and $LiFePO_4$ were prepared by a solid-state reaction. The $^7Li$ MAS NMR experiments were carried out at variable temperatures in order to observe the local structure changes at the temperatures in $Li_4P_2O_7$ system. The $^7Li$ MAS NMR spectra of in $Li_4P_2O_7$ indicate that the lithium local environments in $Li_4P_2O_7$ were not changed in the temperature range between $27^{\circ}C$ and $97^{\circ}C$ Through this work, we confirmed that the small amount of $Li_4P_2O_7$ less than 5.0 wt% in $LiFePO_4$ could be clearly measured by the $^7Li$ MAS NMR spectroscopy at high spinning rate over than 11 kHz.
원통형 삼중모드 유전체 공진기를 이용한 대역 통과 여파기의 설계
장건호(Geon-Ho Jang),박남신(Nam-Shin Park),김병철(Byung-Chul Kim),이돈용(Don-Yong Lee),원정희(Jung-Hee Won),왕욱광(Xu-Guang Wang) 한국전자파학회 2015 한국전자파학회논문지 Vol.26 No.1
본 논문에서는 삼중 TE01δ 모드를 가지는 세라믹 유전체 공진기와 새로운 결합 네트워크를 이용한 대역 통과 여파기를 제안한다. 원통형 유전체 공진기의 삼중 공진 모드를 이해하고, 모드 간 결합분석을 통해 900 MHz 대역의 대역 통과여파기의 설계를 보인다. 유전체 공진기의 높은 품질계수와 제어 가능한 3개의 전송 영점을 통해 우수한 삽입 손실과 감쇄 특성을 얻을 수 있으며 기존 단일 모드 유전체 공진기를 이용한 여파기와 비교하여 60 %의 소형화를 달성하였다. 제안된 대역 통과 여파기 및 설계방법은 회로 해석 및 3차원 모의실험과 측정을 통하여 설계목표와 비교 분석되어 그 타당성을 증명하였다. In this paper, the design of a compact triple-mode bandpass filter using a high-Q cylindrical dielectric resonator is proposed. In detail, the triple TE01δ modes along three orthogonal axes are used and novel coupling structure in the metallic enclosure is adopted to introduce the coupling between the resonant modes. Due to the cross coupling, the proposed bandpass filter has an asymmetric frequency response with flexible three transmission zeros, one of which can be located very close to the passband edge to provide an extremely sharp skirt characteristic with low insertion loss. The proposed filter is about 60 % miniaturized compared with conventional single-mode dielectric resonator filter. The proposed bandpass filter design is validated by the circuit and 3D EM simulations and measurements compared to the target specifications.
이재인,김찬오,김상렬,박남신 한국산업안전학회 1992 한국안전학회지 Vol.7 No.3
In this study, the methods to identify the causes of electrical fires are suggested. Among several causes of electrocal fires, it is focused upon a short-circuit and an over-current accidents, which take the highest ratio compare with any other causes. To propose the exact method of identification, electric wires(HIV, IV ), fuses and plug-receptacls are tested under the conditions of electrical accidents and external fires, respectively. By analyzing the microphotographs, the differences between the results from electrical fires and the others are found out.