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Nitrogen Fertilization on the Growth of Rape (Brassica napus L.) in Newly Reclaimed Land in Korea
Yang, Chang-Hyu,Kim, Taek-Kyum,Kim, Sun,Baek, Nam-Hyun,Choi, Weon-Young,Lee, Jang-Hee,Jung, Jae-Hyeok,Lee, Yong-Hwa,Kim, Si-Ju,Lee, Kyeong-Bo Korean Society of Soil Science and Fertilizer 2011 한국토양비료학회지 Vol.44 No.4
This study was conducted to find out the optimum nitrogen application rate for the stable production of rape in the newly reclaimed land located at Gangwhal region of Saemangum reclaimed land in which the soil is sandy loam (Munpo series). There were five treatments of nitrogen fertilization from zero to 60% increment based on the standard fertilization of $150kg\;ha^{-1}$. The growth of rape (Sunmang) was not affected by salt content while soil salinity was increased at blossoming season of rape. Compared to yield of standard fertilization the yield and the content of oleic acid of rape were increased by 4~26% with the increasing additional nitrogen fertilizer. The results obtained from the growth and yield of rape in this study indicated that it was possible to cultivate rape in a newly reclaimed land if soil salinity was kept below $3dS\;m^{-1}$.
Kim, Si-Jun,Yang, Keun-Hyeok,Lee, Kyung-Ho,Yi, Seong-Tae Techno-Press 2016 Computers and Concrete, An International Journal Vol.17 No.2
This study examined the mechanical properties and adiabatic temperature rise of low-heat concrete developed based on ternary blended cement using ASTM type IV (LHC) cement, ground fly ash (GFA) and limestone powder (LSP). To enhance reactivity of fly ash, especially at an early age, the grassy membrane was scratched through the additional vibrator milling process. The targeted 28-day strength of concrete was selected to be 42 MPa for application to high-strength mass concrete including nuclear plant structures. The concrete mixes prepared were cured under the isothermal conditions of <TEX>$5^{\circ}C$</TEX>, <TEX>$20^{\circ}C$</TEX>, and <TEX>$40^{\circ}C$</TEX>. Most concrete specimens gained a relatively high strength exceeding 10 MPa at an early age, achieving the targeted 28-day strength. All concrete specimens had higher moduli of elasticity and rupture than the predictions using ACI 318-11 equations, regardless of the curing temperature. The peak temperature rise and the ascending rate of the adiabatic temperature curve measured from the prepared concrete mixes were lower by 12% and 32%, respectively, in average than those of the control specimen made using 80% ordinary Portland cement and 20% conventional fly ash.
경막외 Hydromorphone 자가조절진통에서 소양증에 대한 경막외 Naloxone의 효과
방시라 ( Si Ra Bang ),김희숙 ( Hee Suk Kim ),김지혁 ( Ji Hyeok Kim ),심우석 ( Woo Seok Sim ),곽미숙 ( Mi Sook Gwak ),양미경 ( Mi Kyung Yang ),김정수 ( Chung Su Kim ),함태수 ( Tae Soo Hahm ),조현성 ( Hyun Sung Cho ),최덕환 ( Duck H 대한통증학회 2006 The Korean Journal of Pain Vol.19 No.1
사물 인터넷 프로세서 8-bit AVR 상에서의 경량암호 TinyJAMBU 고속 최적 구현
권혁동(Hyeok-Dong Kwon),엄시우(Si-Woo Eum),심민주(Min-Joo Sim),양유진(Yu-Jin Yang),서화정(Hwa-Jeong Seo) 한국정보보호학회 2023 정보보호학회논문지 Vol.33 No.2
암호 알고리즘은 많은 연산 자원을 요구하며 복잡한 수학적 원리를 통해 보안성을 가진다. 하지만 대부분의 사물인터넷 기기는 가용 자원이 한정적이며 그에 따라 연산 성능이 부족하다. 따라서 연산량을 적게 사용하는 경량암호가 등장하였다. 미국 국립표준기술연구소는 경량암호 표준화 공모전을 개최하여 경량암호의 원활한 보급을 꾀했다. 공모전의 알고리즘 중 하나인 TinyJAMBU는 순열 기반의 알고리즘이다. TinyJAMBU는 키 스케줄을 거치지 않는 대신 많은 순열 연산을 반복하며, 이때 시프트 연산이 주로 사용된다. 본 논문에서는 8-bit AVR 프로세서상에서 경량암호 TinyJAMBU를 고속 최적 구현하였다. 제안 기법은 시프트 연산을 반대 방향으로 하여 시프트 횟수를 최소화한 리버스 시프트 기법과 키와 논스가 고정인 환경에서 일부 연산을 사전 연산한 기법이다. 제안 기법은 순열연산에서 최대 7.03배, TinyJAMBU 알고리즘에 적용 시 최대 5.87배 성능 향상을 보였다. 키와 논스가 고정인 환경에서는 TinyJAMBU의 알고리즘이 최대 9.19배만큼 성능이 향상되었다. Cryptographic algorithms require extensive computational resources and rely on complex mathematical principles for security. However, IoT devices have limited resources, leading to insufficient computing power. As a result, lightweight cryptography has emerged, which uses fewer computational resources. NIST organized a competition to standardize lightweight cryptography and TinyJAMBU, one of the algorithms in the competition, is a permutation-based algorithm that repeats many permutation operations. In this paper, we implement TinyJAMBU on an 8-bit AVR processor with a proposed technique that includes a reverse shift method and precomputing some operations in a fixed key and nonce environment. Our techniques showed a maximum performance improvement of 7.03 times in permutation operations and 5.87 times in the TinyJAMBU algorithm, improving up to 9.19 times in a fixed key and nonce environment.
Lee, Chang Hyeok,Lim, Hyo Jin,Park, Jae Hyoung,Kim, Jung Hyun,Kim, Jung Soo,Jeong, Min Joon,Song, Min Kyung,Kim, Si Hwan,Hwang, Su Min,Eom, Tae Kang,Lee, Min Jung,Lee, Yang,Ryu, Sung Ju The Kangwon-Kyungki Mathematical Society 2013 한국수학논문집 Vol.21 No.3
We continue the study of power-Armendariz rings over IFP rings, introducing $k$-power Armendariz rings as a generalization of power-Armendariz rings. Han et al. showed that IFP rings are 1-power Armendariz. We prove that IFP rings are 2-power Armendariz. We moreover study a relationship between IFP rings and $k$-power Armendariz rings under a condition related to nilpotency of coefficients.
양창휴(Chang-Hyu Yang),이장희(Jang-Hee Lee),김선(Sun Kim),정재혁(Jae-Hyeok Jeong),백남현(Nam-Hyun Ba다),최원영(Weon-Young Choi),이상복(Sang-Bok Lee),김영두(Young-Doo Kim),김시주(Si-Ju Kim),이경보(Gyeong-Bo Lee) 한국토양비료학회 2012 한국토양비료학회지 Vol.45 No.3
본 연구는 새만금간척지 광활 및 계화지구 신간척지에서 조사료의 안정생산을 위한 적정 작부체계를 설정코자 2009년 10월부터 2011년 10월까지 수행하였다. 동계 사료작물로 청보리 (영양), 호밀 (곡우), 이탈리안 라이그라스 (passerel plus)와 하계 사료작물로 옥수수 (광평옥), 수수×수단그라스 (G7)를 재배하여 토양화학성, 양분흡수량, 사료가치, 생육 및 수량성을 검토하였다. 시험전 토양은 유기물, 유효인산 및 치환성칼슘 함량이 매우 적었고 치환성마그네슘?나트륨 함량이 많은 알칼리성 염류토양 이었다. 재배기간 동안 토양염농도 변화는 0.2%이하를 나타냈고 염피해는 없었다. 동계 사료작물 입모율은 호밀 〉 청보리 〉이탈리안 라이그라스 순으로 양호하였고 생초 및 건물수량은 이탈리안 라이그라스 〉 호밀 〉 청보리 순으로 높았다. 조단백 함량은 이탈리안 라이그라스 〉 청보리 〉 호밀 순으로 총가소화영양 함량은 청보리 〉 이탈리안 라이그라스 〉 호밀 순으로 많은 경향을 나타냈다. 하계 사료작물 조단백질 및 중성용매불용성섬유, 산성용매불용성섬유 함량은 수수×수단 그라스에서 총가소화영양 함량은 옥수수에서 높았다. 동?하계 사료작물 경엽 및 곡실의 무기양분 함량은 이탈리안 라이그라스와 옥수수에서 높았다. 시험 후 토양화학성은 pH가 낮아지고 총질소 및 유효인산, 치환성칼륨?칼슘 함량이 증가한 반면에 유기물, 치환성마그네슘?나트륨 함량이 감소되는 경향을 나타냈다. 동작물과 하작물을 연계한 수량성 (‘10∼’11)에서 생초수량은 청보리 - 옥수수 (74,740 kg ha<SUP>-1</SUP>) 대비 IRG - 수수×수단그라스 10%, IRG - 옥수수 7%, 호밀 - 수수×수단그라스 6%, 호밀 - 옥수수 및 청보리 - 수수×수단그라스 3% 증수되었고 건물수량은 청보리 - 옥수수 (20,280kg ha<SUP>-1</SUP>) 대비 IRG - 수수×수단그라스 7%, 호밀 - 수수×수단그라스 6%, IRG - 옥수수 3%, 청보리 - 수수×수단그라스 3%, 호밀 - 옥수수 3% 증수되었으며 TDN수량은 청보리 - 옥수수 (13,830 kg ha<SUP>-1</SUP>) 대비 IRG - 수수×수단그라스 2%, 청보리 - 수수×수단그라스 및 IRG - 옥수수 1% 증수되었다. 따라서 생초, 건물수량 및 TDN수량이 높은 “IRG -수수×수단그라스” 및 “청보리 - 수수×수단그라스” 조합을 신간척지 토양특성 (사양토, 배수약간불량, 토양염농도 0.2% 이하)에 알맞은 사료작물 작부조합으로 판단되었다. This study was conducted to find out the optimum cropping system for the stable production of forage crops in the newly reclaimed land located at Gwanghwal and Gyehwa region of Saemangum reclaimed tide land from October, 2009 to October, 2011. Whole crop barley (WCB), Rye, Italyan-ryegrass (IRG) as winter crops and Corn, Sorghum×sudangrass hybrid (SSH) as summer crops were cultivated. Soil chemical properties, nutrient uptake, feed value, growth and yield were examinated. The testing soil was showed saline alkali soil where the contents of organic matter, available phosphate and exchangeable calcium were very low, while exchangeable sodium and magnesium were higher. Changes of soil salinity during the growing season of forage crops were less than 0.2%, and the growth of forage crops was not affected by salt injury. Standing rates of winter crops were higher in the order of Rye, WCB, and IRG, while the dry matter yield of winter crops was higher in the order of IRG, Rye and WCB. The highest crude protein (CP) content was recorded in IRG, and total digestive nutrients (TDN) contents were increased in the order of WCB, IRG, and Rye. The TDN content was higher in corn, whereas other feed value was higher in SSH. The content of mineral nutrients on stem, leaf and grain in IRG, Corn were high. After experiment pH was lowed, contents of exchangeable magnesium, sodium and organic matter were decreased while contents of total nitrogen, available phosphate and exchangeable potassium, calcium were increased. Winer crops and summer crops after continually cultivating in cropping system, fresh matter yield increased, compared to WCB-Corn (74,740 kg ha<SUP>-1</SUP>), IRG-SSH 10%, IRG-Corn 7%, Rye-SSH 6%, Rye-Corn and WCB-SSH 3%. Dry matter yield increased, compared to WCB-Corn (20,280 kg ha<SUP>-1</SUP>), IRG-SSH 7%, Rye-SSH 6%, IRG-Corn/Rye-Corn/WCB -SSH 3%. The TDN yield increased, compared to WCB-Corn (13,830 kg ha<SUP>-1</SUP>), IRG-SSH 2%, WCB-SSH and IRG-Corn 1%. Therefore, we suggest that the crop combination of IRG-SSH and WCB-SSH would be preferred for silage stable production.