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김지호,류권일,고영헌,김팔규 忠南大學校 産業技術硏究所 2001 산업기술연구논문집 Vol.16 No.2
In general, the term soft ground includes clayey soils, which have large compressibility and small shear resistance due to the external load. All process of consolidation in compressible soils can be explained in terms of transfer of load from an incompressible pore-water to a compressible soil structure. Therefore, one of the most important subjects about the characteristics of the time-dependant consolidation of the clay foundation by the charge of load may be the presumption of the final settlement caused by consolidation and the degree of consolidation according to the time. Pioneering work by Terzaghi imparted scientific and mathematical bases to many aspects of this subject and many people have used this theory to measure the consolidation settlement until now. In the paper, Finite Difference Methods for consolidation are considered. First, it is shown the stability criterion of Explicit scheme and the Crank-Nicolson scheme, although unconditionally stable in the mathematical sense, produces physically unrealistic solutions when the time step is large, it is also shown that The fully Implicit scheme shows more satisfactory behavior, but is less accurate for small time steps. And then we need to decide what scheme is more proper to consolidation. The purpose of this paper is to suggest the pertinent scheme to consolidation.
Duchenne 근이영양증 환자에서 Propofol과 Remifentanil을 이용한 전정맥마취 경험 : 증례보고
김상훈,이현영,소금영,정종달,고지현 朝鮮大學校 附設 醫學硏究所 2009 The Medical Journal of Chosun University Vol.33 No.S
Patients with Duchenne's muscular dystrophy are considered to be at risk of peri-operative complications. It's patients can be associated with cardiac arrest, rhabdomyolysis, malignant hyperthermia during anaesthesia. This is a case report of a 14 years old male patient who had known Duchenne muscular dystrophy was scheduled for open reduction and internal fixation of right humerus fracture. Regional anesthesia was refused by the patient. Total intravenous anesthesia (TIVA) was performed with propofol and remifentanil, which was started at the targeted effect concentration of 3.0μg/ml and 10ng/ml via target controlled infusion. After the end of operation, the patient was awaken without any problem and was transferred to recovery room.
Effect of cell-density on in-vitro dopaminergic differentiation of mesencephalic precursor cells
Ko, Ji-Yun,Lee, Ji-Yeon,Park, Chang-Hwan,Lee, Sang-Hun Lippincott Williams Wilkins, Inc. 2005 NEUROREPORT - Vol.16 No.5
Neural precursor cells isolated from early embryonic mesencephalon are in-vitro expanded and differentiated toward dopamine neurons. However, conditions for controlled conversion of the precursors into dopamine neurons largely remained to be determined. We here examined the effects of plating cell density and duration of in-vitro cell expansion on the precursors-derived dopamine differentiation. The yield of dopamine neurons from cultured mesencephalic precursors was greater when the cells were initially plated at higher density. Soluble factors secreted from the precursors appeared to be responsible for the cell density effect. We further demonstrated that the dopamine differentiation potential of the precursors was lost after a long-term cell expansion. Therefore, in order to attain high percentage of dopamine neuron population in mesencephalic precursor cultures, cultures need to be seeded at high cell density and to be expanded for a short period of time.
Choi, Ji Hun,Ji, Young Geon,Ko, Jung Jae,Cho, Han Jun,Lee, Dong Hyeon Wolters Kluwer Health, Inc. All rights reserved. 2018 Pancreas Vol.47 No.5
OBJECTIVES: The aim of this study was to investigate the effects of the activated P2X7 receptors on the proliferation and growth of human pancreatic cancer cells. METHODS: Proliferation was measured by incorporating bromodeoxyuridine into pancreatic cancer cells, MIA PaCa-2 and HPAC. Expression of P2 receptors and signal molecules was examined using quantitative reverse transcription/polymerase chain reaction and/or Western blot. Proliferative effects of the P2X7 receptors in vivo were examined using a xenotransplant model of pancreatic cancer cell lines. RESULTS: Incubating pancreatic cancer cells with adenosine triphosphate (ATP) and 2&vprime;(3&vprime;)-O-(4-Benzoylbenzoyl)ATP resulted in a dose-dependent increase of cell proliferation. The P2 receptor antagonist, KN-62, and small interfering RNA against P2X7 receptors, significantly decreased the proliferative effects of ATP. The ATP-induced proliferation was mediated by protein kinase C, extracellular signal-regulated protein kinases 1 and 2 (ERK1/2), and c-Jun N-terminal kinase (JNK); specifically, ATP increased the phosphorylation of ERK1/2 and JNK. The expression of inducible nitric oxide synthase was decreased by P2X7 receptor activation. In a xenotransplant model, applying ATP significantly increased the growth of induced tumors. CONCLUSIONS: The P2X7 receptor activation by extracellular nucleotides increased proliferation and growth of human pancreatic cancer cells via ERK1/2 and JNK. This supports the pathophysiological role of P2X7 receptors in pancreatic disease and recovery.
Direct Growth of Graphene on Insulating Substrate by Laminated (Au/Ni) Catalyst Layer
Ko, Yong Hun,Kim, Yooseok,Jung, Daesung,Park, Seung Ho,Kim, Ji Sun,Shim, Jini,Yun, Hyeju,Song, Wooseok,Park, Chong-Yun The Korean Vacuum Society 2015 Applied Science and Convergence Technology Vol.24 No.4
A direct growth method of graphene on insulating substrate without catalyst etching and transfer process was developed using Au/Ni/a-C catalyst system. During the growth process, behavior of the Au/Ni catalyst was investigated using EDX, XPS, SEM, and Raman spectroscopy. The Au/Ni catalyst layer was evaporated during growth process of graphene. The graphene film was composed mono-layer flakes. The transmittance of the graphene film was ~80.6%.
In-plane Switching Liquid Crystal Cell with a Mixed Bent Electrode Structure for Fast Response Time
Ko, Tae-Woon,Kim, Jae-Chang,Lee, Joun-Ho,Choi, Hyun-Chul,Ji, Seung-Hoon,Choi, Jung-Min,Lee, Chul-Hun,Lee, Gi-Dong The Korean Infomation Display Society 2008 Journal of information display Vol.9 No.3
A bent electrode structure is proposed in the super in-plane switching (S-IPS) liquid crystal (LC), as it can reduce the response time without loss of transmittance in the bright state. The electrode angle in each position of the bent electrode was optimized to simultaneously achieve high transmittance and fast response time. The electro-optical characteristics of the proposed LC cell structure were experimentally compared with those of the conventional cell. It was observed that the response time became over 8% shorter without loss of transmittance when the proposed bent structure was applied.
Ko, Hyun-Min,Hong, Hun-Pyo,Yoon, Ji-Young,Yoon, Ji-Uk,Lee, Do-Won,Kim, Cheul-Hong The Korean Dental Society of Anesthsiology 2013 Journal of Dental Anesthesia and Pain Medicine Vol.13 No.3
Background: Desflurane has very short induction time because its physical characteristics. But its pungent odor and tendency to irritate the upper airway make it unsuitable for induction of anesthesia. This study was performed to determine what time is prefer to start the desflurane inhalation. Methods: Forty adults (17-45 years) were enrolled in a randomized, double-blind study. Twenty start desflurane inhalation just after loss of consciousness, and the others received desflurane after intubation. We monitored vital signs, BIS, desflurane concentration, rocuronium injection pain response, and airway irritation signs. Results: The demographic data were not different two groups. Early inhalation group showed more stable cardiovascular response than that of late inhalation group. But rocuronium injection pain response and airway irritation sings were not different between two groups. Conclusions: Early inhalation of desflurane (6 vol%) just after loss of consciousness attenuates cardiovascular responses during intubation.
Ko, Ji-Yun,Park, Chang-Hwan,Koh, Hyun-Chul,Cho, Youl-Hee,Kyhm, Jee-Hong,Kim, Young-Soo,Lee, Inchul,Lee, Yong-Sung,Lee, Sang-Hun Blackwell Publishing Ltd 2007 Journal of Neurochemistry Vol.103 No.4
<P>Abstract</P><P>Human embryonic stem (hES) cells can be guided to differentiate into ventral midbrain-type neural precursor (NP) cells that proliferate <I>in vitro</I> by specific mitogens. We investigated the potential of these NP cells derived from hES cells (hES-NP) for the large-scale generation of human dopamine (DA) neurons for functional analyses and therapeutic applications. To address this, hES-NP cells were expanded <I>in vitro</I> for 1.5 months with six passages, and their proliferation and differentiation properties determined over the NP passages. Interestingly, the total hES-NP cell number was increased by > 2 × 10<SUP>4</SUP>-folds over the <I>in vitro</I> period without alteration of phenotypic gene expression. They also sustained their differentiation capacity toward neuronal cells, exhibiting <I>in vitro</I> pre-synaptic DA neuronal functionality. Furthermore, the hES-NP cells can be cryopreserved without losing their proliferative and developmental potential. Upon transplantation into a Parkinson’s disease rat model, the multi-passaged hES-NP cells survived, integrated into the host striatum, and differentiated toward the neuronal cells expressing DA phenotypes. A significant reduction in the amphetamine-induced rotation score of Parkinson’s disease rats was observed by the cell transplantation. Taken together, these findings indicate that hES-NP cell expansion is exploitable for a large-scale generation of experimental and transplantable DA neurons of human-origin.</P>