Reed Solomon VLSI Codec for HDTV

Yongho Park,Sangjin Park 대한전자공학회 1994 대한전자공학회 학술대회 Vol.1994 No.7

Operation Protocols To Improve Durability of Protonic Ceramic Fuel Cells

Park, Ka-Young,Kim, You-Dong,Lee, John-In,Saqib, Muhammad,Shin, Ji-Seop,Seo, Yongho,Kim, Jung Hyun,Lim, Hyung-Tae,Park, Jun-Young American Chemical Society 2019 ACS APPLIED MATERIALS & INTERFACES Vol.11 No.1

<P>To develop reliable and durable protonic ceramic fuel cells (PCFCs), the impacts of the operation protocols of PCFCs on the cell durability are investigated through analyses of the main degradation mechanisms. We herein propose three appropriately designed control protocols, including cathode air depletion, shunt current, and fuel cell/electrolysis cycling, to fully circumvent the operating-induced degradation of PCFCs. For this purpose, anode-supported cells, comprised of a NiO-BaCe<SUB>0.7</SUB>Zr<SUB>0.1</SUB>Y<SUB>0.1</SUB>Yb<SUB>0.1</SUB>O<SUB>3−δ</SUB> anode, BaCe<SUB>0.7</SUB>Zr<SUB>0.1</SUB>Y<SUB>0.1</SUB>Yb<SUB>0.1</SUB>O<SUB>3−δ</SUB> electrolyte, and NdBa<SUB>0.5</SUB>Sr<SUB>0.5</SUB>Co<SUB>1.5</SUB>Fe<SUB>0.5</SUB>O<SUB>5+δ</SUB>-Nd<SUB>0.1</SUB>Ce<SUB>0.9</SUB>O<SUB>2−δ</SUB> composite cathode, are prepared, and their long-term performances are evaluated under a galvanostatic condition of 0.5 A·cm<SUP>-2</SUP> at 650 °C. The cell voltages of the protected cells using the operation protocols to prevent performance degradation are stably maintained under the applied current density for more than 1200 h without any noticeable degradation, whereas the performance of the unprotected cell gradually decreased with time, and the decay ratio was 14.9% over 850 h. The significant performance decay of the unprotected cell is strongly associated with the cathode degradation phenomenon, which was caused by the water vapor continuously produced during the electrochemical reactions. Hence, the performance recovery of the PCFCs with the operation protocols is achieved by incrementally decreasing the cathode potential (close to a value of zero) to minimize the effect of high <I>P</I><SUB>H</SUB><SUB><SUB>2</SUB></SUB><SUB>O</SUB> and <I>P</I><SUB>O</SUB><SUB><SUB>2</SUB></SUB> during the PCFC operations.</P> [FIG OMISSION]</BR>

Development of a Radiopharmaceutical using 166Ho-chitosan Complexes against Prostate Cancer

Park KyongBae,Ryu JeiMan,Seong SeungKyoo,Bae EunJung,Song YoungJun,Jung YongHo,Kwak ChuI,Park MunSoo,Lee SangEun,Shin ByungChul,Shigematsu Akiyo 大韓藥學會 2003 大韓藥學會 總會 및 學術大會 Vol.2003 No.1

Graphite patterning in a controlled gas environment

Park, Joonkyu,Kim, K B,Park, Jun-Young,Choi, T,Seo, Yongho IOP Pub 2011 Nanotechnology Vol.22 No.33

<P>Although a number of methods using scanning probe lithography to pattern graphene have already been introduced, the fabrication of real devices still faces limitations. We report graphite patterning using scanning probe lithography with control of the gas environment. Patterning processes using scanning probe lithography of graphite or graphene are normally performed in air because water molecules forming the meniscus between the tip and the sample mediate the etching reaction. This water meniscus, however, may prevent uniform patterning due to its strong surface tension or large contact angle on surfaces. To investigate this side effect of water, our experiment was performed in a chamber where the gas environment was controlled with methyl alcohol, oxygen or isopropanol gases. We found that methyl alcohol facilitates graphite etching, and a line width as narrow as 3 nm was achieved as methyl alcohol also contains an oxygen atom which gives rise to the required oxidation. Due to its low surface tension and highly adsorptive behavior, methyl alcohol has advantages for a narrow line width and high speed etching conditions.</P>

Enhanced proton conductivity of yttrium-doped barium zirconate with sinterability in protonic ceramic fuel cells

Park, Ka-Young,Seo, Yongho,Kim, Ki Buem,Song, Sun-Ju,Park, Byoungnam,Park, Jun-Young Elsevier 2015 Journal of Alloys and Compounds Vol.639 No.-

<P><B>Abstract</B></P> <P>In this study, we report the effects of various ceramic processing methods with different sintering aids on the relative density, crystallinity, microstructure, and electrical conductivity of proton conducting BaZr<SUB>0.85</SUB>Y<SUB>0.15</SUB>O<SUB>3−</SUB> <I> <SUB>δ</SUB> </I> (BZY) pellets in details. First, the BZY ceramic pellets are fabricated by the solid-state reactive sintering by adding diverse sintering aids including CuO, NiO, ZnO, SnO, MgO, and Al<SUB>2</SUB>O<SUB>3</SUB>. Among these, CuO is found to be the most effective sintering aid in terms of the sintering temperature and total conductivity. However, transition metals as sintering aids have detrimental effects on the electrical conductivity of the BZY electrolytes. Second, the BZY electrolytes have been synthesized by four different methods: the solid-state, combustion, hydrothermal, and polymer gelation methods. The BZY pellets synthesized by the polymer gelation method exhibit dense microstructure with a high relative density of 95.3%. Moreover, the electrical conductivity of the BZY pellets synthesized by the polymer gelation method is higher than those prepared by the solid-state methods under the same test conditions: 1.28×10<SUP>−2</SUP> Scm<SUP>−1</SUP> (by the polymer gelation method) vs. 0.53×10<SUP>−2</SUP> Scm<SUP>−1</SUP> by the solid-state method at 600°C in wet 5% H<SUB>2</SUB> in Ar.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Report effects of ceramic processing methods on the electrical conductivity of BZY. </LI> <LI> Present effects of sintering aids on the conductivity and density of BZY. </LI> <LI> CuO is the most effective sintering aid for the BZY. </LI> <LI> Polymer gelation is the most effective method in terms of conductivity of BZY. </LI> <LI> Grain boundary conductivity of the polymer gelation BZY is higher than others. </LI> </UL> </P>

영업 관리직 리더십 역량모델개발에 관한 연구

박용호(Yongho Park) 중앙대학교 한국인적자원개발전략연구소 2012 역량개발학습연구 Vol.7 No.3

급변하는 경영환경 속에서 기업들은 자신들의 경쟁력을 유지하기 위해 다양한 노력을 기울이고 있다. 최근의 기업들은 이러한 노력 중에서도 특히 리더의 역량개발에 큰 관심을 보이고 있다. 많은 기업들이 리더들을 위한 역량모델을 구축하고 있고 이를 바탕으로 교육훈련 및 평가를 실시하고 있다는 것은, 리더의 역량에 대한 높은 관심을 증명하는 하나의 사실이라고 할 수 있다. 본 연구는 리더십 역량에 대한 이해를 높이고자 IT 서비스 업종의 영업 관리자들에게 요구되는 리더십 역량이 무엇인지 탐색하고자 한다. 또한 탐색된 각 역량에 대하여 미래의 중요도와 현재의 보유정도를 파악하여 각 역량에 대한 우선순위를 파악하고자 한다. 이러한 연구목적을 위해 본 연구는 국내의 한 IT 서비스 회사를 대상으로 자료를 수집하였다. 수집된 자료를 통해 도출된 리더십 역량모델은 총 10개의 역량으로 구성되었으며, 연구결과는 각 역량에 대해 미래 필요정도와 현재 보유정도에 대한 유의미한 인식의 차이를 보여주었다. 또한 보리치 우선순위공식을 통해 각 역량에 대한 개발의 우선순위도 파악할 수 있었다. 본 연구는 도출된 결과를 통해 이론적• 실천적 시사점과 향후 연구에 대한 제안점을 제시하고 있다. In the rapid changing business environment, business organizations are trying to keep competitiveness. In this business environment, many companies are interested in developing leaders` competency. Also, companies are using leadership competency model as a foundation of training and evaluation for enhancing their leader`s expertise in modern business environment. This study aims to understand leadership competencies more comprehensively through the analysis on the priority in the leadership competencies. The priority which was drawn from this study may be used as the criterion for constructing training system. Data were collected from a domestic IT service company for answering the research questions. The results showed that 10 leadership competencies are needed to the sales managers and those 10 competencies are able to be grouped into two sub-groups. Also, the results identified statistically significant difference between future importance and current performance level in those 10 leadership competencies. The study results examined the different priority in 10 leadership competencies, too. Based on the drawn results, this study provides practical and theoretical implications suggestions for future studies.

현대사회의 경력개발 이슈

박용호 ( Park Yongho ) 인천대학교 사회과학연구원 2013 사회과학연구 Vol.3 No.-

The academic field of Human Resource Development(HRD) is composed of three areas including individual development(ID), organization development(OD), and career development(CD). However, the career development have not been investigated enough so far. This study aims to show the current research issue in career development area in HRD and to provide the suggestion for future study. Traditionally, the career has been defined as the series of work related experience. Based on this definition, the career development has been discussed as the series of the short cycle which may be applied to individual's career stages. In this modern society, there are several career development issues which may be discussed academically for future studies. In modern society characterized rapid changing and globalization, firstly, the subjective career success may be the key evaluation criteria of career development. Second, the career mobility has been enhanced in modern society, and this trend has been named boundaryless career. Third, the individual's responsibility has been critical in managing his own career. This trend has been protean career. Fourth, work and life balance is another key issue in discussing career development. Lastly, career competency is another academically interesting subject. Based on the current career development issue, this study suggest the practical suggestion for HRD practitioners.

제32회 전국수학교육연구대회 특집/논문초록 : 논문초록 ; 수학교육공학 : 테크놀로지를 활용한 교수학적 환경에서 대수적 연산오류지도에 관한 연구

박용호 ( Park Yongho ),탁동호 ( Tag Dongho ) 한국수학교육학회 2004 뉴스레터 Vol.20 No.1

Adenoviral vector-mediated glucagon-like peptide 1 gene therapy improves glucose homeostasis in Zucker diabetic fatty rats

Lee, Yongho,Kwon, Mi Kyong,Kang, Eun Seok,Park, Young Mi,Choi, Seung Ho,Ahn, Chul Woo,Kim, Kyung Sub,Park, Chul Won,Cha, Bong Soo,Kim, Sung Wan,Sung, Je Kyung,Lee, Eun Jig,Lee, Hyun Chul John Wiley Sons, Ltd. 2008 The journal of gene medicine Vol.10 No.3

<B>Background</B><P>Glucagon-like peptide-1 (GLP-1) is a gut-derived incretin hormone that plays an important role in glucose homeostasis. Its functions include glucose-stimulated insulin secretion, suppression of glucagon secretion, deceleration of gastric emptying, and reduction in appetite and food intake. Despite the numerous antidiabetic properties of GLP-1, its therapeutic potential is limited by its short biological half-life due to rapid enzymatic degradation by dipeptidyl peptidase IV. The present study aimed to demonstrate the therapeutic effects of constitutively expressed GLP-1 in an overt type 2 diabetic animal model using an adenoviral vector system.</P><B>Methods</B><P>A novel plasmid (pAAV-ILGLP-1) and recombinant adenoviral vector (Ad-ILGLP-1) were constructed with the cytomegalovirus promoter and insulin leader sequence followed by GLP-1(7–37) cDNA.</P><B>Results</B><P>The results of an enzyme-linked immunosorbent assay showed significantly elevated levels of GLP-1(7–37) secreted by human embryonic kidney cells transfected with the construct containing the leader sequence. A single intravenous administration of Ad-ILGLP-1 into 12-week-old Zucker diabetic fatty (ZDF) rats, which have overt type 2 diabetes mellitus (T2DM), achieved near normoglycemia for 3 weeks and improved utilization of blood glucose in glucose tolerance tests. Circulating plasma levels of GLP-1 increased in GLP-1-treated ZDF rats, but diminished 21 days after treatment. When compared with controls, Ad-ILGLP-1-treated ZDF rats had a lower homeostasis model assessment for insulin resistance score indicating amelioration in insulin resistance. Immunohistochemical staining showed that cells expressing GLP-1 were found in the livers of GLP-1-treated ZDF rats.</P><B>Conclusions</B><P>These data suggest that GLP-1 gene therapy can improve glucose homeostasis in fully developed diabetic animal models and may be a promising treatment modality for T2DM in humans. Copyright © 2007 John Wiley & Sons, Ltd.</P>

PC-1D 도핑프로파일에서 BSF 후면전계효과에 따른 P타입 결정질 실리콘 고효율 태양전지에 관한 연구

박용호(Park, Yongho),김봉기(Kim, Bonggi),이준신(Lee, Junsin) 한국신재생에너지학회 2011 한국신재생에너지학회 학술대회논문집 Vol.2011 No.11

BSF 후면전계효과는 태양전지의 개방전압 증가를 결정하며 효율에 매우 중요한 요인이다. 본 연구에서는 p-type에서의 후면전계효과를 확인하기 위해 PC1D 시뮬레이션(Simulation)을 통해 p+ 영역의 표면농도와 깊이에 따른 전기적 특성을 분석 하였다. 최적효율을 찾기위해 면저항을 30{Omega}/{square}으로 고정하고 깊이와 표면 농도값을 가변하였다. 최적화 결과 표면농도값이 작아지고 깊이가 커질수록 효율이 좋아지는 경향이 나타났으며 Peak doping=5{times}10^{18}cm^{-3}, Juction depth=12.52um에서 최고효율 19.14%를 얻을 수 있었다. 본 시뮬레이션을 바탕으로 실제 태양전지 제작 과정에 적용 가능하다. p-type 태양전지 제작에서 후면의 p+ 영역의 깊이를 증가시키고, 표면 농도를 낮추는 공정을 통해 효율향상을 기대 할 수 있다.