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Development of Weeder Machine to Remove Furrow Weeds by Applying Circle Blade
( Hyunjune Lee ),( Subo Yang ),( Hwanggyu Lee ),( Hongmin Ahn ),( Jinhyun Kim ),( Taewook Kim ) 한국농업기계학회 2018 한국농업기계학회 학술발표논문집 Vol.23 No.1
Removing the weeds from the furrow from the field crop cultivation should be carried out at an appropriate time. Most of the blade currently used in the flat shape and is not suitable for removing weeds from furrow. This research is to develop a weeder machine using a circle blade to efficiently remove weeds in the furrow. The geometric shape of the furrow was designed to develop the weeder machine. Circle blade shapes were based on the depth and width of the furrow from which the field crops were grown. Circle blade shapes were designed to fit the shape and size of the furrow so they would effectively remove weeds in the furrow. Weeder machine driving part is designed to drive a 300mm wheel using a differential gear on the engine’s power extraction device. And the auxiliary wheel was applied to the front of the weeder machine to adjust the height of weeder machine. In the weeding part, a designed by arranging two circle blades in pairs. Depending on the size of the furrow, the angle of placement for the circle blade was designed from 60 to 120 degrees.Power transmission is accomplished by distributing power to both sides using bevel gears. Blade rotation and driving tests were conducted. The optimum circle blades rotation speed of weeder machine drive speed were measured. As a result, it was judgement that the running speed of 4km/h was most suitable at the rotation speed of 3,000~4,000rpm.
Lee Hyunjun,Hong Yong Tae 대한후두음성언어의학회 2023 대한후두음성언어의학회지 Vol.34 No.3
Amyloidosis is a idiopathic clinical syndrome caused by deposition of non-soluble protein fibers in the extracellular matrix of organs and tissues. It causes chronic inflammation and destruction of the architecture and functionality of the involved tissue. Amyloidosis occurring in the upper airway tract is rare, accounting for 0.2% to 1.2% of benign tumors of the larynx. In general, the purpose of treatment is reduce the risk of dysphagia and dyspnea. Endoscopic surgery is the mainstream of the treatment because laryngeal preserving is the most important goal of treatment. However, the disadvantage of this treatment is that it can lose voice and may require multiple reoperation. In this article, we report a case in which vertical partial laryngectomy (VPL) in a patient with laryngeal amyloidosis, because the patient want her voice restoration. It was observed that voice restoration and airway patency were maintained for two years without additional surgical treatment after the surgery. Although additional studies are needed, VPL can be a good option for patients who want to preserve their voice.
Lee, Boreum,Lee, Hyunjun,Kim, Sehwa,Cho, Hyun-Seok,Cho, Won-Chul,Jeon, Byong-Hun,Kim, Chang-Hee,Lim, Hankwon Elsevier 2019 ENERGY Vol.182 No.-
<P><B>Abstract</B></P> <P>Economic uncertainty analysis of employing a membrane reactor (MR) equipped with H<SUB>2</SUB>O separation membranes for a synthetic natural gas (SNG) production as simultaneous power-to-gas and CO<SUB>2</SUB> utilization technologies was carried out. Based on previously reported reaction kinetics, process simulation models were created for a conventional packed-bed reactor (PBR) and an MR. Deterministic economic analysis showed the unit SNG production cost of 1.67 $ kgSNG<SUP>−1</SUP> in an MR compared to 1.82 $ kgSNG<SUP>−1</SUP> in a PBR for a SNG production capacity of 1000 kg d<SUP>−1</SUP>, showing about 8% cost reductions in the MR. From sensitivity analysis, raw material and labor were identified as the key economic factors to affect a unit SNG production cost for all cases studied. Stochastic economic analysis using a Monte-Carlo simulation method provided better insights for economic-uncertainty associated with premature technology like a SNG production in an MR using H<SUB>2</SUB>O separation membranes by presenting a wide range of SNG production costs and their probability.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A H<SUB>2</SUB>O permeable membrane reactor (MR) was proposed to improve SNG yield. </LI> <LI> Deterministic and stochastic economic analysis for SNG production were performed. </LI> <LI> For industrial-scale plant, the MR showed about 8% cost saving of a unit SNG cost. </LI> <LI> Uncertainty analysis presented a wide range of a unit cost from 1.01 to 2.28 $ kg<SUP>−1</SUP>. </LI> </UL> </P>
Some Features of Dye-sensitized Solar Cell Combining with Single-walled Carbon Nanotubes
Lee, Sanghun,Park, Hyunjune,Park, Taehee,Lee, Jongtaek,Yi, Whikun Korean Chemical Society 2014 Bulletin of the Korean Chemical Society Vol.35 No.3
A dye-sensitized solar cell (DSSC) was fabricated with a nanocrystalline $TiO_2$ film electrode on FTO glass, N719 dye, electrolytes (or $CsSnI_3$), and counter Pt electrode by incorporating it with single-walled carbon nanotubes (SWNTs). SWNTs were combined with $TiO_2$ film, $CsSnI_3$, Pt electrode, separately, and the SWNT-containing cell was compared with a pristine cell in cell performance. We also examined the performance change by pressing $TiO_2$ film, during cell fabrication, inside a high pressure chamber. Mostly, the change of conversion efficiency was compared for each cell, and an atomic force microscopy data were suggested to explain our results.
Hyunjun Kim,Sang Jun Suh,Ho-Jun Kang,이민석,Yoon-Soo Lee,Jeong-Ho Lee,Dong-Gee Kang 대한신경손상학회 2018 Korean Journal of Neurotrauma Vol.15 No.1
Objective: Patients with traumatic acute subdural hematoma (ASDH) often require surgical treatment. Among patients who primarily underwent craniotomy for the removal of hematoma, some consequently developed aggressive intracranialhypertension and brain edema, and required secondary decompressive craniectomy (DC). To avoid reoperation, we investigated factors which predict the requirement of DC by comparing groups of ASDH patients who did and did not requireDC after craniotomy. Methods: The 129 patients with ASDH who underwent craniotomy from September 2007 to September 2017 were reviewed. Among these patients, 19 patients who needed additional DC (group A) and 105 patients who underwent primarycraniotomy only without reoperation (group B) were evaluated. A total of 17 preoperative and intraoperative factors wereanalyzed and compared statistically. Univariate and multivariate analyses were used to compare these factors. Results: Five factors showed signifcant differences between the two groups. They were the length of midline shifting tomaximal subdural hematoma thickness ratio (magnetization transfer [MT] ratio) greater than 1 (p<0.001), coexistence of intraventricular hemorrhage (IVH) (p<0.001), traumatic intracerebral hemorrhage (TICH) (p=0.001), intraoperative fndingsshowing intracranial hypertension combined with brain edema (p<0.001), and bleeding tendency (p=0.02). An average valueof 2.74±1.52 was obtained for these factors for group A, which was signifcantly different from that for group B (p<0.001). Conclusion: An MT ratio >1, IVH, and TICH on preoperative brain computed tomography images, intraoperative signsof intracranial hypertension, brain edema, and bleeding tendency were identifed as factors indicating that DC would berequired. The necessity for preemptive DC must be carefully considered in patients with such risk factors Objective: Patients with traumatic acute subdural hematoma (ASDH) often require surgical treatment. Among patientswho primarily underwent craniotomy for the removal of hematoma, some consequently developed aggressive intracranialhypertension and brain edema, and required secondary decompressive craniectomy (DC). To avoid reoperation, we investigated factors which predict the requirement of DC by comparing groups of ASDH patients who did and did not requireDC after craniotomy. Methods: The 129 patients with ASDH who underwent craniotomy from September 2007 to September 2017 were reviewed. Among these patients, 19 patients who needed additional DC (group A) and 105 patients who underwent primarycraniotomy only without reoperation (group B) were evaluated. A total of 17 preoperative and intraoperative factors wereanalyzed and compared statistically. Univariate and multivariate analyses were used to compare these factors. Results: Five factors showed signifcant differences between the two groups. They were the length of midline shifting tomaximal subdural hematoma thickness ratio (magnetization transfer [MT] ratio) greater than 1 (p<0.001), coexistence of intraventricular hemorrhage (IVH) (p<0.001), traumatic intracerebral hemorrhage (TICH) (p=0.001), intraoperative fndingsshowing intracranial hypertension combined with brain edema (p<0.001), and bleeding tendency (p=0.02). An average valueof 2.74±1.52 was obtained for these factors for group A, which was signifcantly different from that for group B (p<0.001). Conclusion: An MT ratio >1, IVH, and TICH on preoperative brain computed tomography images, intraoperative signsof intracranial hypertension, brain edema, and bleeding tendency were identifed as factors indicating that DC would berequired. The necessity for preemptive DC must be carefully considered in patients with such risk factors