혼합소스 HVPE 방법에 의해 성장된 육각형 Si 결정

이강석,김경화,박정현,김소윤,이하영,안형수,이재학,전영태,양민,이삼녕,전인준,조채용,김석환,Lee, Gang Seok,Kim, Kyoung Hwa,Park, Jung Hyun,Kim, So Yoon,Lee, Ha Young,Ahn, Hyung Soo,Lee, Jae Hak,Chun, Young Tea,Yang, Min,Yi, Sam Nyung,Jeon, I 한국결정성장학회 2021 한국결정성장학회지 Vol.31 No.3

Hexagonal shape Si crystals were grown by the mixed-source hydride vapor phase epitaxy (HVPE) method of mixing solid materials such as Si, Al and Ga. In the newly designed atmospheric pressure mixed-source HVPE method, nuclei are formed by the interaction between GaCl_n, AlCl_n and SiCl_n gases at a high temperature of 1200℃. In addition, it is designed to generate a precursor gas with a high partial pressure due to the rapid reaction of Si and HCl gas. The properties of hexagonal Si crystals were investigated through scanning electron microscopy (FE-SEM), energy dispersive X-ray spectroscopy (EDS), high-resolution X-ray diffraction (HR-XRD), and Raman spectrum. From these results, it is expected to be applied as a new material in the Si industry.

자연형 소하천의 호안공법별 식생분포 조사

이강석,박진기,연규방,박종화,Lee, Kang-Suk,Park, Jin-Ki,Yeon, Gyu-Bang,Park, Jong-Hwa 충남대학교 농업과학연구소 2011 Korean Journal of Agricultural Science Vol.38 No.2

Riparian vegetation distribution patterns and diversity relative to various fluvial geomorphic channel patterns, stream bank stabilization methods, and stream flow processes are described and interpreted for selected nature-friendly small stream bank protection of Goesan, central Korea. Idong Stream Pilot Project, which began in May 2003 and finished in December 2003, was selected to develop effective methods which was nature-friendly stream bank protection. The project aim to maintain or increase stream bank stabilization ecosystem goods and services while protecting downstream and stream bank ecosystem. A number of protecting methods which were a Flight of fieldstone, Vegetation block, Green river block, Stone net, Green environment block, Eco friendly cobble, Vegetation mat and Geo-green cell and Firefly block were applied on the bank of Idong stream. The stream sites have been monitored about vegetation conditions each method in 2007. We selected six points to separately investigate in left and right bank. The main purpose of this study was to find out suitable methods and to improve stream restoration techniques for ecosystem. On the stream bank, H environment block method (9.7) was the highest average of vegetation coverage and Firefly block method (3.87) was the lowest average in applied methods.

광합성 세균 Rhodobacter capsulata 에 의한 우라늄 흡착

이강석,김진규,김인규,박효국,이정호 ( Kang Suk Lee,Jin Kyu Kim,In Gyu Kim,Hyo Kook Park,Jeong Ho Lee ) 한국하천호수학회 1990 생태와 환경 Vol.23 No.4

Aqueous waste effluents from nuclear fuel processing operations may contain trace quantities of heavy metals such as uranium, Conventional treatment of waste waters may be ineffective or expensive when uranium concentrations in the waste water must be reduced down to 1 ㎍/㎖ or less. The ability of some microorganisms to uptake or adsorb dissolved heavy metals offers an alternative method for waste treatment. The adsorption of uranium by Rhodobacter capsulata DSM 1710, a strain of photosynthetic bacteria, was examined to identify factors that might affect a process for the removal of uranium from aqueous solution. The optimal pH for uranium adsorption was 4.5. Temperature had little or no effect on the process since more than 95% of dissoved uranium was adsorbed to the bacterial biomass within 10 minutes after mixing of cell biomass at 25, 30, and 40 ℃, all the same. Maximum capacity of uranium adsorption by R. capsulata DSM 1710 was equivalent to 1/4 of the dry cell mass (248 ㎍ U/㎎-dry biomass), the highest among the reported so far.

New type winding 권선법 고려한 Slotless 전동기 설계 기법 연구

이강석,서재한(Jaehan Suh),고상준,채수황(Soohwang Chae),이주(ju Lee),Hyungkwan Jang,Sol Kim 대한전기학회 2018 대한전기학회 학술대회 논문집 Vol.2018 No.-

공항운영 향상을 위한 Self Bag-Drop System(무인수하물처리시스템) 적용가능성 연구

이강석,지민석,Lee, Kang-Seok,Ji, Min-Seok 한국항공운항학회 2015 한국항공운항학회지 Vol.23 No.2

Advanced countries in the aviation industry, especially the United States and European Union, develop and commercialize their own SBD system integrated with IT convergence technology, dominating the international market. Nevertheless, most of SBD technologies in domestic airports rely on other countries. It is imperative that internal airport operators introduce the Self Bag Drop system and produce, apply, and manage the most optimized SBD system for airports and airlines. Upon analyzing the tendency and operation of the SBD system utilized in leading international airports, this is conducted to address the possibility of the future implementation in domestic airports.

자연형 호안공법을 적용한 소하천의 수리특성 분석

이강석,박종화,연규방,Lee, Gang-Seuk,Park, Jong-Hwa,Yeon, Kyu-Bang 한국관개배수위원회 2010 한국관개배수논문집 Vol.17 No.2

Stream Pilot Project, which began in May 2003 and finished in December 2003, was selected to develop effective methods applicable to nature-like streams. Stream restoration projects aim to maintain or increase ecosystem goods and services while protecting downstream and coastal ecosystems. Fields environmental monitoring such as flow discharge and precipitation were conducted along the Idong stream for amount of channel zone change in 2007. This study selected three monitoring positions to measure the water level and discharge of flowing water. A stage-discharge relation is obtained from direct discharge measurements for three stations by fitting an empirical relationship to the data set. Since discharge measures are made only for low flow conditions, a curve of discharge against stage can then be built by fitting these data with a power curve. And this study used data obtained from floodmark checkup as well as HEC-RAS model to analyze the hydrodynamic characteristics of monitoring sites. Reach-averaged hydraulic parameters for the supply reach were calculated from the small area's HEC-RAS model for Idong stream, and a HEC-RAS model used to analyze hydraulics for a period in 2007, after the stream was considered bank stabilization.

학교시설물 내진성능 평가 및 내진보강 가이드라인

이강석,김형준,Lee, Kang-Seok,Kim, Hyung-Joon 한국교육시설학회 2012 교육시설 Vol.19 No.2

기존 R/C 건축물의 내진진단기준

이강석,Lee, Kang Seok 한국구조물진단유지관리공학회 2012 한국구조물진단유지관리공학회지 Vol.16 No.1

기존 국내 학교 건축물의 내진성능 평가법

이강석,Lee, Kang Seok 한국구조물진단유지관리공학회 2012 한국구조물진단유지관리공학회지 Vol.16 No.1

MANET에서 악의적인 노드의 안전하고 효율적인 검출 방안

이강석,최종오,지종복,송주석,Lee KangSeok,Choi JongOh,Ji JongBok,Song JooSeok 한국정보처리학회 2005 정보처리학회논문지 C : 정보통신,정보보안 Vol.12 No.5

최근 MANET에서의 연구는 보안을 고려한 라우팅 서비스에 주목되어 왔으나 기존에 제시되었던 MANET에서의 악의적인 노드를 식별하는 방안들은 거짓 신고하는 악의적인 노드가 있을 때에는 이를 적절히 식별하고 제거하지 못하는 문제점이 있었다. 따라서 본 논문에서는 신고자와 혐의자 목록으로 구성되는 신고 메시지와 신고 테이블을 이용하여 경로 설정단계에서는 정상적으로 동작하지만 데이터 전달 과정에서는 데이터를 버리거나 내용을 변경시키는 행위, 또는 다른 노드를 거짓으로 신고하는 등의 악의적인 노드를 식별하는 효율적인 방안을 제안한다. 제안하는 방안은 DSR 과 AODV에 모두 적용 가능하다. 또한 성능분석을 위해 AODV와 제안된 알고리즘과 비교 분석하여 제안된 알고리즘이 평균 분실률 및 전송량 측면에서 현격한 성능차이를 있음을 보였다. Lately, the MANET research has focused on providing routing services with security and previous schemes have been proposed for detecting malicious nodes in a MANET. However, they still include some problems which malicious nodes cannot be found when they falsely report other nodes as malicious. Accordingly, we propose a novel and efficient scheme for detecting malicious nodes using report messages and a report table which is consisted of node ID both for suspecting and reporting when the malicious nodes behave normally during the route discovery, but the other hand they drop and modify packets, or falsely report other nodes as malicious during the data transmission. Our proposed scheme is applicable to not only DSR but aiso AODV. And we provide some simulation results of our proposed scheme by comparing general AODV with our proposed scheme. Simulation results show that our Proposed scheme outperforms general AODV in terms of average packet loss ratio and packet delivery ratio.