Effect of Mn and C on Age Hardening of Fe–Mn–Al–C Lightweight Steels

Sung‑Won Park,Jun Young Park,Kyong Mox Cho,Jae Hoon Jang,Seong‑Jun Park,Joonoh Moon,Tae‑Ho Lee,Jong‑Ho Shin 대한금속·재료학회 2019 METALS AND MATERIALS International Vol.25 No.3

The effects of Mn and C content on the age hardening of Fe–Mn–Al–C lightweight steels, which have austenitic or duplex(austenite and ferrite) microstructures, were investigated. An increase in Mn content induced a delay of the age hardeningthat is caused by the formation of intra-granular κ-carbides. In order to interpret the effect of Mn content, first-principlescalculations were conducted using the supercells of Fe24Al8C8,Fe24Al8C7,Fe24(Al7Mn)C8, and Fe24(Al7Mn)C7. The calculationsshowed that an increase in Mn content could be the source of the delay of the intra-granular κ-carbide formation bysuppressing C atom’ occupation of the vacancy at the body-centered site of L12. An increase in C content accelerated theformation of intra-granular κ-carbides, which induced the intense age hardening, and coarse inter-granular κ-carbides, whichresulted in significant decrease in impact absorbed energy due to inter-granular fracture.

CM전문회사의 현장관리조직 운영실태 분석

신원상(Shin, Won-Sang),이강민(Lee, Kang-Min),손창백(Son, Chang-Baek) 대한건축학회 2014 大韓建築學會論文集 : 構造系 Vol.30 No.8

This study is aimed at offering basic data for enhancing the organizational structure and productivity of on-site construction management (CM) employees. To accomplish the objective, the organizational operation system and employee evaluation of domestic CM companies were analyzed by site scale to promote efficient operation. The findings are as follows. First, in terms of CM workforce, the employees handling architecture, electricity, and machines represented the highest proportion. As for qualification, top engineers were dispatched to both large-scale and small-scale CM sites more than any other employee. Second, the results on CM organizational productivity are as follows. The per capita sales increased as the service payment increased. In terms of scale, the site worth less than a billion won had per capita sales of 76 million won, about 5 times less than the site worth 5 billion won or more whose per capita sales were 371 million won. The monthly per capita sales also increased as the service payment increased. However, the difference was minimal, about a half of the difference in per capita sales. These findings would be useful for companies that have no systematic criteria for CM organization selection and evaluation.

Implementation of UPT Service in WIN-Based Mobile Communication Networks

Yun Won Chung(정윤원),Min Young Chung(정민영),Dan Keun Sung(성단근),In Jeong Kim(김인정),Jung Keun Shin(신정근),Sung Kim(김성) 한국통신학회 1999 한국통신학회 학술대회 및 강연회 Vol.1999 No.4

Photonic Crystals: Integration of Colloidal Photonic Crystals toward Miniaturized Spectrometers (Adv. Mater. 9/2010)

Kim, Shin-Hyun,Park, Hyo Sung,Choi, Jae Hoon,Shim, Jae Won,Yang, Seung-Man WILEY-VCH Verlag 2010 Advanced materials Vol.22 No.9

<B>Graphic Abstract</B> <P>The cover shows a schematic illustration of patterned colloidal photonic crystals with different bandgap positions. When an unknown light source impinges on the patterned photonic crystals, the light information can be identified from the reflection intensity profile of the constituent photonic crystals. The two optical microscopy images and background image display integrated photonic crystals with 20 different bandgaps spanning the entire visible range, and the SEM image shows the cross-section of the photonic crystal stripes, as reported by Shin-Hyun Kim, Seung-Man Yang, and co-workers on p. 946. <img src='wiley_img_2010/09359648-2010-22-9-ADMA201090022-content.gif' alt='wiley_img_2010/09359648-2010-22-9-ADMA201090022-content'> </P>

과학기술정보콘텐츠 통합관리시스템 구축을 위한 데이터 마이그레이션 모델 수립 및 적용 사례

신성호(Sung-Ho Shin),이민호(Min-Ho Lee),이원구(Won-Goo Lee),윤화묵(Hwa-Mook Yoon),성원경(Won-Kyung Sung),김광영(Kwang-Young Kim) 한국컴퓨터정보학회 2011 韓國컴퓨터情報學會論文誌 Vol.16 No.11

국내 데이터베이스 구축 시장은 작년 기준으로 3조 6,633억원 규모로 추정된다. 데이터베이스 산업의 지속적인 성장과 맞물려, 데이터 마이그레이션의 중요성도 날로 높아지고 있다. 고객 위치를 찾아주는 g-CRM이나 고객에게 상품을 추천하는 맞춤 설계 기능 등은 모두 고객 데이터베이스, 상품 데이터베이스, 지리정보 데이터베이스 등이 결합되어야 구현 가능한 서비스들이다. 스마트 비즈니스의 핵심 인프라도 통합되고 완전하며 신뢰할 수 있는 데이터베이스라고 할 수 있다. 이러한 데이터베이스의 중요성에도 불구하고, 데이터 마이그레이션 및 통합 과정의 효율적인 수행 방안이나 데이터 검증 방법에 대하여는 구체적인 연구가 부족한 실정이다. 본 연구에서는 다양한 타입으로 존재하는 과학기술분야 콘텐츠들을 대상으로 데이터 마이그레이션을 위한 모델을 설계하였고, 모델을 기반으로 실제 데이터 마이그레이션 작업을 수행한 결과를 제시하였다. 아울러 데이터 마이그레이션 결과에 대한 검증을 위해 데이터베이스의 완전성, 데이터값의 일관성, 관계의 일관성을 검증하였고, ANSI/ASQ Z1.4-2003에서 제시된 샘플링 검사 기법도 적용하였다. 결과적으로 모델 수립에 의한 체계적인 데이터 마이그레이션 수행은 데이터베이스 정합성 및 데이터값의 정확성에 영향을 미치고, 고품질의 데이터베이스를 유지하기 위한 필수 요소라 할 수 있다. The domestic market of database in Korea is estimated to be over 3.663 trillion won. The data migration is getting to be more important along with the continuous growth of the database industry. g-CRM and private recommending function are examples of the service that can be given through coupling among customer database, product database, geographic information database, and others. The core infrastructure is also the database which is integrated, perfect, and reliable. There are not enough researches on efficient way of data migration and integrating process and investigation of migrated data though trends of database in IT environment as above. In connection with this issue, we have made a model for data migration on scientific and technological contents and suggest the result of data migration process adapting that model. In addition, we verified migration's exhaustiveness, migration's consistency, and migration's coherence for investigation of migrated data and database. From the result, we conclude data migration based on proper model has a significant influence on the database consistency and the data values correctness and is essential to maintain high qualified database.

결련택견의 문화적 특성에 관한 연구

도기현 ( Ki Hyun Do ),원영신 ( Young Shin Won ),조성원 ( Sung Won Jo ) 대한무도학회 2013 대한무도학회지 Vol.15 No.3

택견으로 마을과 마을이 편을 갈라 마을의 명예를 걸고 한바탕 겨루어 보는 것을 ``결련택견``이라고 하는데 택견의 단체전이라는 단순한 의미를 넘어 우리문화의 많은 특성을 보여주는 소중한 문화유산이다. 타격투기에서는 찾기 어려운 단체전 격투기 스포츠 종목인 결련택견의 특성을 파악하여 그 속에 내재된 우리나라의 문화적 특성을 살펴보고자 하는 것이 본 연구의 목적이다. 결련택견의 문화적 특성에 대한 연구결과는 다음과 같다. 첫째, 결련택견은 격투기 스포츠 중에서 매우 드물게 열린 공간인 야외 마당에서 단체전으로 행해지고 있었다. 둘째, 결련택견은 누구나가 쉽게 참가하고 관람할 수 있으며 선수와 관중이 다른 격투기 스포츠와는 달리 매우 밀착되어 있는 것으로 나타났다. 셋째, 경기규칙이 단순하기에 누구나가 쉽게 참여할 수 있는 대중성과 간단한 규칙으로 인한 경기의 의외성이 연결되어 있었다. 넷째, 결련택견에서의 승자는 계속해서 경기에 임하는 연승제이므로 영원한 승자가 있을 수 없으며, 특히 연승제라는 규칙 안에서 출전선수의 차례가 정해져 있지 않고 상황에 따라 선수를 출전시키기 때문에 팀을 위한 희생이 필요한 구조를 가지고 있는 것으로 나타났다. 이는 강자와 약자의 명확한 구분보다는 팀을 위해 희생하고 함께 즐길 수 있는 대동단결의 구조로 되어 있다는 것을 보여주고 있었다. 다섯째, 특별한 보호구가 없이도 심각한 부상을 방지할 수 있는 경기규칙으로 안전성을 확보하고 있었으며, 공격기술의 제한을 통하여 상대선수를 보호할 수 있는 안전장치가 발달된 안전한 격투기 스포츠이다. 이러한 특성들은 인간 존중의 문화를 가지고 있는 우리문화의 한 단면을 잘 보여주고 있다. 마지막으로 경기 전후에 각 선수들이 독창적으로 선보이는 ``본때뵈기``와 같은 즉흥적 퍼포먼스는 개인의 강한 개성과 자유스러운 우리민족의 예술적 창의성을 잘 보여주고 있으며, 격투기임에도 풍류를 즐기는 우리 민족의 문화적 특성이 담겨있다. 한바탕 힘과 기예를 겨루면서도 서로를 존중하고, ``우리``를 강조하며 단결을 중요시하는 결련택견은 우리의 문화이기에 무조건 소중하다는 국수주의적인 사고가 아니라 21세기 스포츠계에 새로운 패러다임을 보여줄 수 있다는 점에서 매우 가치가 높은 우리민족의 자랑스러운 문화유산이라 할 수 있다. Taekkyeon is the only Korean martial art to be designated as a Korean national treasure (no. 76). Long ago in Korea Taekkyeon competitions were held between towns. However, these competitions were about more than just winning. These Taekkyeon teams fought for the pride and honor of their towns. This style of Taekkyeon is know as ``Kyulyun Taekkyeon``. When observing Kyulyun Taekkyeon you are able to see more than just fighting. Watching Kyulyun Taekkyeon allows a person to glimpse various precious aspects of Korean culture and its people. The purpose of this study is to detail Korean culture as it is observed through Kyulyun Taekkyeon`s unique group fighting competitions. Kyulyun Taekkyeon competitions are a team sport, which embody three unique characteristics. First, Kyulyun Taekkyeon competitions are held outside in the open public. Second, the rules of a Kulyun Taekkyeon competition are easy, allowing anybody who wishes to compete or enthusiastically watch along. Third, due to Kyulyun Taekkyeon`s open friendly atmosphere, both Kyulyun Taekkyeon competitors and spectators can unite as one. In addition, Kyulyun Taekkyeon competitions can be enjoyed by people of all ages, both young and old. For this reason, Kylyun Taekyon helps to bring a towns people together. In a Kyulyun Taekkyeon competition a player continually fights until he loses. Therefore, in Kyulyun Taekkyeon there is no such thing as an undefeated champion. Additionally, due to the ordering of players in a Kyulyun Taekkyeon competition, sometimes a coach must strategically sacrifice one of his players in order to give his team a better chance of winning. In a Kyulyun Taekkyeon competition the sacrifice of a player for his team is as equally admired as the skill of a winning player. Due to the rules of a Kyulyun Taekkyeon competition players are limited in the techniques in which they can use. By limiting the techniques of a player Kyulyun Taekkyeon creates a safe, yet realistic sport. This can be seen to display Korea`s culture of respecting others. Finally, before a Kyulyun Taekkyeon competition players must showcase their skills in a special performance called a ``bontaebaegie``. Bontaebages can be seen to display Korean`s artistic talent. I am not insisting these things just because Kyulyun Taekkyeon is Korean, but instead because of Kyulyun Taekkyeon`s ability to revolutionize 21st century sports.

Nanogenerators: Fully Rollable Transparent Nanogenerators Based on Graphene Electrodes (Adv. Mater. 19/2010)

Choi, Dukhyun,Choi, Min-Yeol,Choi, Won Mook,Shin, Hyeon-Jin,Park, Hyun-Kyu,Seo, Ju-Seok,Park, Jongbong,Yoon, Seon-Mi,Chae, Seung Jin,Lee, Young Hee,Kim, Sang-Woo,Choi, Jae-Young,Lee, Sang Yoon,Kim, Jo WILEY-VCH Verlag 2010 ADVANCED MATERIALS Vol.22 No.19

<B>Graphic Abstract</B> <P>The cover shows an image of fully rollable transparent nanogenerators synthesized using chemical vapor deposition grown large-scale graphene sheets as transparent electrodes and piezoelectric ZnO nanorod arrays. Sang-Woo Kim, Jae-Young Choi, and co-workers report on p. 2187 the electrical and structural stability of the nanogenerators, with excellent charge scavenging performance under external mechanical loads such as bending and rolling. This study shows that graphene-based nanogenerators are very promising for self-powered rollable transparent device applications. <img src='wiley_img_2010/09359648-2010-22-19-ADMA201090066-content.gif' alt='wiley_img_2010/09359648-2010-22-19-ADMA201090066-content'> </P>

SL 무기질 바닥재의 경제성 분석에 관한 연구

박호근 ( Ho Geun Park ),홍성욱 ( Seong Wook Hong ),양재영 ( Je Yong Yang ),김상원 ( Sang Won Kim ),신찬호 ( Chan Ho Shin ),최민권 ( Min Kwon Choe ) 한국건축시공학회 2011 한국건축시공학회 학술발표대회 논문집 Vol.11 No.1

This study is concerned with the development of the SL inorganic floor covering. First, volatile organic compounds, inorganic test profile on the SL through the flooring is environment-friendly inorganic noncombustible floor finishes the event of fire toxic gases (such as volatile organic compounds) emissions have been identified as not at all. Second, SL-breathable material, the concrete floor to prevent aging, long life, which are three levels of noise, shock-absorbing function was decreased. Third, SL economic analysis of mineral flooring terrazzo tile floors compared with the normal material. On a terrazzo tile cost 13,500 won ~ 24,500 won, but It have found that, in terms of labor SL 36,899 won ~ 38,899 won flooring mineral balance. Occurs in the total amount when compared with terrazzo tile floors and 25,399 won 3T, 5T and economical analysis concludes that the original 12,399 won.

우황청심원(牛黃淸心元)이 저산소증 유발 배양신경세포에 미치는 영향

조규선,신길조,문일수,이원철,정승현,Cho, Gyu-Seon,Shin, Gil-Cho,Moon, Il-Soo,Lee, Won-Chul,Chung, Sung-Hyun 대한한방내과학회 2001 大韓韓方內科學會誌 Vol.22 No.2

Objectives : The purpose of this investigation is to evaluate the effects of Woohwangcheongsim-won on neuronal death of hypoxic E18 cortical neuroblast. Methods : To evaluate the effect of Woohwangcheongsim-won on neuronal death caused by hypoxia, the survival rate of E18 cortical neuroblast was measured with MTT assay and the changes of several synaptic proteins and enzymes were investigated with the immunoblot assays. Results : The E18 cortical neuroblasts were added 50, 100, 500, 1,000, and $5,000{\mu}g/ml$ Woohwangcheongsim-won. They showed neurotoxicity, when the concentration of Woohwangcheongsim-won was above $1,000{\mu}g/ml$. The E18 cortical neuroblasts, which were added 50, 100, and $500{\mu}g/ml$ Woohwangcheongsim-won, were exposed 98% $N_2/5%\;CO_2$ for 3 hours to induce hypoxia, 3 days later, the survival rate of $50{\mu}g/ml$ Woohwangcheongsim-won was 141.5% when compared to the control group. On the immuneblot assays, the expressions of ${\alpha}$CaMKII, NR2A, NR28, PDE2, PSD-95, and eEF-$1{\alpha}$ were increased in normoxia, but those of NR2A, NR2B were decreased in hypoxia when compared to the control group. Conclusions : The data shows that the effects of Woohwangcheongsim-won on neuronal death of hypoxic E18 cortical neuroblast is a significant result.

Magnetoelastic coupling origin in second - order spin reorientation transition in ultrathin Co - Pd alloy films

Sang-Koog Kim,Jeong-Won Lee,Jong-Ryul Jeong,Jonggeol Kim,Sung-Chul Shin 한국진공학회 2001 한국진공학회 학술발표회초록집 Vol.- No.-