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Opto-electronic properties of TiO2nanohelices with embedded HC(NH2)2PbI3perovskite solar cells
Lee, Jin-Wook,Lee, Seung Hee,Ko, Hyun-Seok,Kwon, Jeong,Park, Jong Hyeok,Kang, Seong Min,Ahn, Namyoung,Choi, Mansoo,Kim, Jong Kyu,Park, Nam-Gyu The Royal Society of Chemistry 2015 Journal of materials chemistry. A, Materials for e Vol.3 No.17
<P>A HC(NH2)2PbI3solar cell of perovskite structure based on TiO2nanohelices has been developed. Well-aligned helical TiO2arrays of different pitch (<I>p</I>) and radius (<I>r</I>), helix-1 (<I>p</I>/2 = 118 nm,<I>r</I>= 42 nm), helix-2 (<I>p</I>/2 = 353 nm,<I>r</I>= 88 nm) and helix-3 (<I>p</I>/2 = 468 nm,<I>r</I>= 122 nm), were grown on fluorine-doped tin oxide (FTO) glass by oblique-angle electron beam evaporation. HC(NH2)2PbI3perovskite was deposited on the TiO2nanohelices by a two-step dipping method. Helix-1 showed higher short-circuit current density (<I>J</I>SC), whereas helix-3 exhibited slightly higher open-circuit voltage (<I>V</I>OC). HC(NH2)2PbI3perovskite combined with helix-1 demonstrated an average power conversion efficiency of 12.03 ± 0.07% due to its higher<I>J</I>SCcompared to helix-2 and helix-3. The higher<I>J</I>SCof helix-1 could be attributed to its greater light scattering efficiency and higher absorbed photon-to-current conversion efficiency. In addition, despite having the longest pathway structure, helix-1 showed rapid electron diffusion, attributed to its higher charge injection efficiency due to the larger contact area between perovskite and TiO2. We have established that fine tuning of the interface between perovskite and the electron-injecting oxide is a crucial factor in achieving a perovskite solar cell of high performance.</P>
이남영(Namyoung Lee),김용대(Yongdae Kim),지상현(Sanghyun Jee) 한국자동차공학회 2002 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2002 No.5_2
An overview of the analytical noise and vibration simulations performed to support the design and development of the frame vehicle was presentfd Analytical models of the structural vehicle and acoustic cavity were developed, and several simulations related to the NVH were performed in the development Stage. All of the simulations were performed to minimize development time as well as to optimize the cost, weight, and performanace of the NVH and the maximwn frequency of these analyses is 200 Hz.<br/> The modal analysis and design sensitivity analysis of the body-in-white and frame were performed to minimize the mass While maintaining the body stiffness. Most of the subsystems such as steering, suspension and exhaust pipe system were analyzed respectively in the combined system for the design studies of the idle shake and high-speed wheel shake analysis. Structure-borne noise due to both road-induced vibration and engine vibration were considered. Most of the NVH analysis procedure for the frame vehicle was validated to make the design implementation. The vehicle design cycle was reduced and the noise and vibration quality was improved by application of these simulations.
이호철(Hocheol Lee),이남영(Namyoung Lee),송창규(Changkyu Song),박천홍(Chunhong Park),이후상(Husang Lee) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
In this paper, we suggest a polishing head with a mechanical gimbals-like structure for the optics fabrication. In the small tool polishing processes, several types of polishing mechanism have been tried to get more deterministic and high efficient optical fabrication. The conventional polishing processes to use the contacting pad material of polyurethane or pitch need the higher polishing rate to shorten the overall polishing time for large optics. Therefore, new polishing head mechanism is designed to use the air backpressure and gimbals-like hinge structure to increase polishing velocity. In the following experiment, mechanical adaptability was confirmed both on the flat glass and the convex aluminum surface.
Choi Jin Ho,Lee Sang Hyub,Kim Joo Seong,Park Namyoung,Lee Myoeng Hwan,Lee Min Woo,Cho In Rae,Paik Woo Hyun,Ryu Ji Kon,Kim Yong-Tae 거트앤리버 소화기연관학회협의회 2023 Gut and Liver Vol.17 No.5
Background/Aims: The combinatorial effects of prophylactic methods for postendoscopic retrograde cholangiopancreatography pancreatitis (PEP) in patients with risk factors remain unclear. In this network meta-analysis, we compared the efficacy of various prophylactic strategies to decrease the risk of PEP among patients with risk factors. Methods: A systematic review was performed to identify randomized controlled trials from PubMed, Embase, and the Cochrane Library through July 2021. We used frequentist network meta-analysis to compare the rates of PEP among patients who received prophylactic treatments as follows: class A, rectal nonsteroidal anti-inflammatory drugs; class B, prophylactic pancreatic stent; class C, aggressive hydration; or control, no prophylaxis or active control. We selected those studies that included patients with risk factors for PEP. Results: We identified 19 trials, comprising 4,328 participants. Class ABC (odds ratio [OR], 0.08; 95% confidence interval [CI], 0.03 to 0.24), class AC (OR, 0.10; 95% CI, 0.02 to 0.47), class AB (OR, 0.12; 95% CI, 0.05 to 0.26), class BC (OR, 0.13; 95% CI, 0.04 to 0.41), class A (OR, 0.16; 95% CI, 0.05 to 0.50), and class B (OR, 0.26; 95% CI, 0.14 to 0.46), were associated with a reduced risk of PEP as compared to that of the control. The most effective prophylaxis was ABC (0.87), followed by AC (0.68), AB (0.65), BC (0.56), A (0.49), and B (0.24) according to P-score. Conclusions: The results of this network meta-analysis suggest that the more prophylactic methods are employed, the better the outcomes. It appears that for patients with risk factors, we need to prevent PEP through the use of these well proven combination strategies.
Kim Ga Hee,Choi Kyu,Paik Namyoung,Lee Kyu Taek,Lee Jong Kyun,Lee Kwang Hyuck,Han In Woong,Kang Soo Hoon,Heo Jin Seok,Park Joo Kyung 거트앤리버 소화기연관학회협의회 2022 Gut and Liver Vol.16 No.4
Background/Aims: As pancreatic mucinous cystic neoplasms (MCNs) are considered premalignant lesions, the current guidelines recommend their surgical resection. We aimed to investigate the concordance between preoperative and postoperative diagnoses and evaluate preoperative clinical parameters that could predict the malignant potential of MCNs. Methods: Patients who underwent surgical resection at Samsung Medical Center for pancreatic cystic lesions and whose pathology was confirmed to be MCN, between July 2000 and December 2017, were retrospectively analyzed. Results: Among a total of 132 patients 99 (75%) were diagnosed with MCN preoperatively. The most discordant preoperative diagnosis was an indeterminate pancreatic cyst. The proportion of male patients was higher (24.2% vs 7.1%, p=0.05) in the diagnosis-discordance group and the presence of worrisome features in radiologic imaging studies, such as wall thickening/enhancement (12.1% vs 37.4%, p=0.02) or solid component/mural nodule (3.0% vs 27.3%, p=0.02), was lower in the diagnosis-discordance group. The presence of symptoms (57.7% vs 34.9%, p=0.02), tumor size greater than 4 cm (80.8% vs 55.7%, p=0.04), and radiologic presence of a solid component/ mural nodule (42.3% vs 16.0%, p=0.01) or duct dilatation (19.2% vs 6.6%, p=0.01) were significantly associated with malignant MCNs. Conclusions: In our study, the overall diagnostic concordance rate was confirmed to be 75%, and our findings suggest that MCNs have a low malignancy potential when they are less than 4 cm in size, are asymptomatic and lack worrisome features on preoperative images.