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테입캐스팅을 이용한 대면적 (100 cm<sup>2</sup>) 연료극 지지체식 평판형 고체산화물 연료전지의 개발
유승호,송근숙,손희정,김종희,송락현,정두환,백동현,신동열,Yu, Seung-Ho,Song, Keun-Suk,Song, Hee-Jung,Kim, Jong-Hee,Song, Rak-Hyun,Jung, Doo-Hwan,Peck, Dong-Hyun,Shin, Dong-Ryul 한국전기화학회 2003 한국전기화학회지 Vol.6 No.1
본 연구에서는 중저온에서 작동되는 연료극 지지체식 평판형 연료전지를 연구하였으며, 저가의 공정인 테입케스팅법을 이용하여 $0.8\~1mn$의 두께와 $25,\; 100,\;150cm^2$크기의 평판형 연료극 지지체를 제작하였고, 연료극 지지체의 특성을 확인하기 위해서 기공률, 가스 투과율 그리고 전기전도도 등을 측정하였다. $12wt.\%$의 결합제를 사용하여 제작된 지지체의 기공률은 $45.8\%$이고 환원 시 $53.9\%$로 증가함을 보였다. 연료극 지지체는 $850^{\circ}C$에서 900S/cm의 높은 전기전도도를 나타내었으며, 1기압 하에서 공기로 측정하였을 때 6l/min의 기체투과량을 보였다. 단전지의 제조는 테잎케스팅 법으로 제조된 연료극 지지체위에 슬러리 디핑 코팅법을 이용하여 전해질과 공기극을 순차적으로 제조하였다. YSZ의 농도를 $10wt.\%\;와\;20wt.\%$로 하여 제조된 전해질의 두께는 각각 form와 300m이었고, 공기극은 LSM-YSZ/LSM/LSCF의 다층 구조로 구성되었다. $10{\mu}m$두께의 전해질은 매우 치밀하였고 3기압 하에서 가스 투과도는 2.5ml/min을 나타내었다. 단전지의 성능 시험에서 $20\~30{\mu}m$두께의 전해질을 갖는 연료극 지지체식 평판형 연료전지는 $750^{\circ}C$에서 0.6V, $300 mA/cm^2$성능을 보였다. For the development of low temperature anode-supported planar solid oxide fuel cell, the planar anode supports with the thickness of 0.8 to 1 mm and the area of 25, 100 and $150\;cm^2$ were fabricated by the tape casting method. The strength, porosity, gas permeability and electrical conductivity of the planar anode support were measured. The porosity of anode supports sintered at $1400^{\circ}C$ and then reduced in$H_2$ atmosphere was increased from $45.8\%\;to\;53.9\%$. The electrical conductivity of the anode support was $900 S/cm\;at\; 850^{\circ}C$ and its gas permeability was 6l/min at 1 atm in air atmosphere. The electrolyte layer and cathode layer were fabricated by slurry dip coating method and then had examined the thickness of $10{\mu}m$ and the gas permeability of 2.5 ml/min at 3 atm in air atmosphere. As preliminary experiment, cathode multi-layered structure consists of LSM-YSZ/LSM/LSCF. At single cell test using the electrolyte layer with thickness of 20 to $30{\mu}m$, we achieved $300\;mA/cm^2$ and 0.6V at $750^{\circ}C$
뫼비우스 증후군 - 발병기전, 임상양상, 진단 및 치료 -
유승호,Seung Ho Yu 대한융합한의학회 2021 대한융합한의학회지 Vol.1 No.1
Objectives: To review the concept of Moebius syndrome. Methods: Literature search was done to study definition, epidemiology, pathophysiology, clinical feature, and treatment of Moebius syndrome. Pubmed, RISS, Google scholarship and uptodate scholastic were used in the research. Search words were 'Moebius syndrome', 'treatment of Moebius syndrome'. Only English and Korean studies were assessed. Results: Moebius syndrome is rare disease characterized by nonprogressive congenital uni- or bi-lateral facial (VII cranial nerve) and abducens (VI cranial nerve) palsy. This facial palsy is found across the world, and its incidence is approximately 1 per 250,000. Moebius is diagnosed by clinical features. Facial palsy, eye abduction problem, limb deformities, global cerebral nerve impairment can be shown. Rehabilitation, smile surgery, and acupuncture can be used to treat this. Conclusion: Moebius syndrome's epidemiology, pathogenesis, treatment is still not fully revealed. It is known to be a congenital disease which didn't have exact treatment except surgery. But, it needs further study about exact treatment, diagnosis, and pathogenesis.
한국인 알코올 중독환자에서 도파민 D4 수용체의 대립 유전자 연관성에 대한 연구
유승호,이민수,Ryu, Seung Ho,Lee, Min Soo 대한생물정신의학회 2001 생물정신의학 Vol.8 No.2
The dopamine D4 receptor gene has a hypervariable segment in the coding region characterized by a varying number of 48bp repeats in exon III of the gene. Varying the numbers of repeated segments may change the length, structure, and function of the receptor, which makes this gene a possible candidate for variations in dopamine-related behaviors, such as alcoholism and drug abuse. We evaluated the dopamine D4 receptor genotype in male alcoholics and normal controls. All alcoholics and controls were unrelated and from the Korean population. Genotype and allele frequencies in 67 alcoholics were compared to 67 controls who were free of alcohol abuse, substance abuse, and major mental illness. No association was found between the dopamine D4 receptor allele and alcoholism. This result indicate that there is no association of the dopamine D4 receptor with alcoholism in Korean. Further systemized investigation to determine the role of dopamine D4 receptor gene in alcoholism with a larger sample size will be required.
유승호,Ryu, Seung Ho 대한생물정신의학회 2002 생물정신의학 Vol.9 No.1
Even though alcoholism is a multi-factorial psychiatric disorder, it is reasonable to suppose that genetic factors play a substantial role in the manifestation of this disorder. Because alcohol is the reinforcing substance which manifests its effects through activation of the mesolimbic dopaminergic reward pathway of the brain, the gene encoding dopamine receptor subtypes can be a major natural candidate gene. Since 1990, many association studies have identified strong evidence implicating the dopamine D2 receptor(DRD2) gene in alcoholism, specifically TaqI A minor(A1) allele. Association studies have also been conducted on other dopamine receptor(DRD3 & DRD4) polymorphisms but the results have yet to be confirmed. Through a number of other approaches, each dopamine receptor gene has been investigated in association with different phenotypes in alcoholism, but further researches will be needed. In conclusion, studies in the past decade have shown that the TaqI A1 allele of the DRD2 gene is associated with alcoholism in various subject groups. Other dopamine receptor genes have since been added to the list but yet to be identified. Thus, the knowledge of these genes and their functional significance will enhance the understanding of the underlying biological mechanisms of alcoholism. Furthermore, it could lead to more helpful prevention and treatment approaches to alcoholism.
유승호(Seung Ho Yoo) 한국경영과학회 2017 한국경영과학회지 Vol.42 No.1
This study investigates a buyer-supplier supply chain, in which a buyer delegates the production process to a supplier as in many practices. The consumer’s buying intention and overall supply chain performance are affected not only by the buyer’s decision on sales price but also by the supplier’s decision on product quality. Therefore, the buyer has a motivation to control the supplier’s quality investment. Among various incentive schemes that the buyer can adopt in practice, we consider a revenue-sharing contract and investigate its unique characteristics. By comparison with a typical wholesale price contract, we reveal that the revenue-sharing contract can enhance supply chain’s overall performance, including quality, demand, and profits of not only overall supply chain but also each player. We contribute to the academia and the supply chain practice by providing important guidelines in adopting incentive schemes and effectively managing product quality in a supply chain.
스마트시티 구현을 위한 데이터 시각화 도구로써 시티대시보드
유승호(Yoo, Seung-Ho) 대한건축학회 2017 대한건축학회 학술발표대회 논문집 Vol.37 No.2
The concept of the smart city has been developed as the latest urban model to apply advanced Information and Communication Technologies (ICT) into the urban environment. This paper provides a work in progress that will elevate a method for data visualization and its impacts in the milieu of the smart city. Visualizing multiple types of urban data in the real time is considered as the most fundamental and important aspect of the smart city to understand citizens for operating the urban mechanism, and lead them to proper actions based on the current situation. We present ‘City Dashboard’ that has been adopted in various cities in the world as an integrated data visualization method to deliver valid data to citizens. Furthermore, we seek to identify the characteristics and limitations of the City Dashboard for the sake of providing more benefits of smart city initiatives and implementation than what they have been worked.