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국내 연안 카페리 차량 고박 장치 안전성에 관한 연구 제2부
정준모(Joonmo Choung),조희상(Huisang Jo),이경훈(Kyunghoon Lee),이영우(Young Woo Lee) 한국해양공학회 2016 韓國海洋工學會誌 Vol.30 No.6
For a carferry with a displacement of 1,633 tonf, a seakeeping analysis-based direct load approach (DLA) was used in Part I of these series, where the final deliverable was the long-term probabilistic acceleration components. In Part II of these series, the tangential acceleration components are explained based on two approaches: a standard called the IMO CSS code and simple formulas with the probable maximum roll and pitch rotations. The subsequent tangential acceleration-induced external force components are also introduced for these two approaches. The lashing strength components were selected from the IMO CSS code. It was assumed that two different vehicles (a car and a truck) were stowed at the most distant locations on the main deck to assume the largest tangential acceleration components and were secured with four steel wires with longitudinal and transverse lashing angles of 45∘. Four cases were considered, with different methods for predicting the acceleration components and different tools for the external loads and lashing strengths involved: cases Rule-LS (rule-based maximum probable roll and pitch angles for predicting the acceleration components in conjunction with LashingSafety), DLA-LS (seakeeping-based long-term acceleration components with LashingSafety), CSS-LC (IMO CSS code-based acceleration components using LashCon), and CSS-LS (IMO CSS code-based acceleration components using LashingSafety). In terms of the acceleration and external force components, the CSS-LC and CSS-LS results are more than two times the results of Rule-LS. Thus, when the external forces and lashing strengths are evaluated using CSS-LC and CSS-LS, the truck needs more lashing wires, while Rule-LS and DLA-LS predict that the present lashing configuration is on the safe side.
국내 연안 카페리 차량 고박 장치 안전성에 관한 연구 제1부
정준모(Joonmo Choung),조희상(Huisang Jo),이경훈(Kyunghoon Lee),이영우(Young Woo Lee) 한국해양공학회 2016 韓國海洋工學會誌 Vol.30 No.6
The capsizing and consequent sinking of a coastal car ferry was recently reported, with numerous human casualties. The primary cause was determined to be a sudden turn with improperly stowed and secured cargo. Part I of this study introduces how long term acceleration components are determined from seakeeping analyses. A carferry with a displacement of 1,633 tonf was selected as the target vessel. Sea data that included the significant wave heights and periods were collected at four observation buoys, some of which were far away from two main voyage routes: Incheon-Jeju and Pusan-Jeju. Frequency response analyses were performed to obtain the linearized radiation force coefficients, hydrostatic stiffnesses, and wave excitation forces. Time response analyses were sequentially performed to produce the motion-induced acceleration processes. The probabilistic distributions of the acceleration components were determined using a peak and valley counting method. Long term extreme acceleration components were proposed as a final result.
Park, Joonmo,Jun Kim, Hee,Nam, SangHyeon,Kim, Hyowook,Choi, Hak-Jong,Jang, Youn Jeong,Sung Lee, Jae,Shin, Jonghwa,Lee, Heon,Baik, Jeong Min Elsevier 2016 Nano energy Vol.21 No.-
<P><B>Abstract</B></P> <P>Two-dimensional design based on ultrathin TiO<SUB>2</SUB> film for enhanced visible light absorption and photo-catalytic applications is reported, which mainly consists of three layers of gold film, TiO<SUB>2</SUB> film, and gold nanoparticles (Au NPs). The Au and TiO<SUB>2</SUB> films are produced by e-beam evaporation and atomic layer deposition, respectively, in a carefully controlled way to minimize surface roughness. As compared with bare TiO<SUB>2</SUB> film, the Au NPs/TiO<SUB>2</SUB>/Au film significantly increased the photoactivity over the entire UV and visible wavelength range. The Au film increases the light absorption in the UV region with TiO<SUB>2</SUB> acting as an impedance-matching layer, while the Au NPs increase the light absorption in the visible region due to the plasmonic resonance effects, increasing the photocurrent under visible light. 3D numerical simulation results suggest that the Au film also plays an important role in enhancing the electrical field intensity at the TiO<SUB>2</SUB> film in contact with Au NPs, by efficient excitation of localized surface plasmon resonances, thereby, contributing to the enhanced photoactivity of the film in the visible range. This simple system may serve as an efficient platform for solar energy conversion utilizing the whole UV-visible range of solar spectrum based on two-dimensional plasmonic photoelectrodes.</P> <P><B>Graphical abstract</B></P> <P>The table of contents entry: Two-dimensional metastructured film with Titanium Oxide is fabricated as a photo-catalytic photoanode with exceptional visible light absorption. The metastructured film consist of three layers of Au film, ultrathin TiO<SUB>2</SUB> layer (20nm), and Au nanoparticles (NPs), and shows high light absorption of about 90% in the visible range of 380–700nm, while the Au film shows only 60 % in the wavelength of 380–500nm.</P> <P>[DISPLAY OMISSION]</P>
The Brightness Characteristics of the V- grooved LGPs Carved with Heated Tip
Kyuman Choi,JoonMo Lee,Yunsik Lee,SeungMok. Lee 대한전자공학회 2010 ICEIC:International Conference on Electronics, Inf Vol.1 No.1
LGP referred as an important component in a back light unit of the LCD. Appropriate cutting conditions of the tip were investigated followed by the LGP was fabricated using the previously optimized tip. The tip was heated to make the V-groove which possessed the depths of tens to hundreds ㎛. The brightness and brightness uniformity characteristics of the LGP fabricated in this experiment were found to be about 20% and 15% higher than that of the commercial products.
Tawfik, Wael Z.,Kumar, C. M. Manoj,Park, Joonmo,Shim, Sang Kyun,Lee, Hansung,Lee, Jaehwi,Han, Jong Hun,Ryu, Sang-Wan,Lee, Naesung,Lee, June Key Royal Society of Chemistry 2019 Journal of Materials Chemistry C Vol.7 No.37
<P>High efficiency and mass-scale production ultraviolet (UV) light sources have become a basic requirement for various applications, and as such have attracted considerable technological interest. Here, a flat 2 inch UV-light-source tube-based triode structure operating at 330 nm with a pulse-scan mode was achieved by integrating the AlGaN/GaN multi-quantum well (MQW) heterostructure as a cathodoluminescence (CL) layer and carbon nanotube (CNT) field emitters. The AlGaN/GaN MQW heterostructure CL layer was grown on a high-quality 2 inch AlN/sapphire template through metal-organic chemical vapor deposition. The CNT emitters were fabricated on the metal substrate using a cost-effective print screen method. The advantages of these emitters include their high stable emission efficiency for large-scale production, cold emission nature, controllable emission by the electric field, and environmentally friendly nature. This promising and effective integration demonstrates an output power of 590 mW and a power efficiency of 2.45% with a low consumption energy of 24 W (anode current 3 mA; anode voltage 8 kV) in pulse-scan mode. This work is the first step toward realizing future mass-scale and high efficiency UV light source tubes over a wide range of wavelengths.</P>
Joonmo Park,Jin-Kyoung Oh,Kwang-Woo Kwon,Young-Ho Kim,Sung-Soo Jo,Jun Key Lee,Sang-Wan Ryu IEEE 2008 IEEE photonics technology letters Vol.20 No.4
<P>A photonic crystal (PC) light-emitting diode (LED) was fabricated using an anodized aluminum oxide (AAO) nano-pattern technique, which has potential applications to mass production. The AAO nano-pattern, which was anodized in 0.3-M oxalic acid at 70 V, was transferred to the n-GaN bottom cladding through reactive ion etching and covered during the regrowth of GaN to form periodic air holes. The PC was embedded into the bottom cladding, which resulted in a low operating voltage. For the PC LED, the light output was enhanced by more than 20%, while the operating voltage increased only slightly. The radiation pattern of the PC LED showed two lobes at approximately plusmn30deg, which originated from the diffraction by PC.</P>
Effect of Zn on Pore Characteristics in Lotus-Type Porous Cu
Lee, Ji-Woon,Kim, Hyung-Tae,Kim, Sang-Wook,Jung, Taek-Kyun,Jin, Changhyun,Choung, Joonmo,Kim, Changjae,Chung, Soonwan,Hyun, Soong-Keun American Scientific Publishers 2018 Journal of Nanoscience and Nanotechnology Vol.18 No.3
<P>The effect of Zn on pore characteristics in lotus-type porous Cu alloy was investigated. The lotus-type porous Cu-Zn alloys were fabricated with Zn content from 0.01 to 0.1 at% by the centrifugal casting method. The results demonstrated that the porosity was rarely affected by Zn content. However, the average pore diameter and pore number density of the lotus type porous Cu-Zn alloys were significantly affected by the Zn content. The average pore diameter decreased as the Zn content increased up to 0.01 at%, and then increased as the Zn content increased up to 0.1 at%. In contrast, the variations in the pore number density of the lotus-type porous Cu-Zn alloys showed the reversed tendency with respect to that of the average pore diameter. The increase in heterogeneous nucleation sites for pores attributed to the decreased average pore diameter and the increased pore number density.</P>