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全南 昇州地域의 단감 施設栽培에 있어서 PE Film의 被覆時期가 生育에 미치는 影響
張準明,陳英旭 순천대학교 지역개발연구소 1993 地域開發硏究 Vol.4 No.-
This experiment was conducted to study the effects of P.E film covering dates on Growth and Development in non-heating plastic house cultivation of sweet persimmon 'shur Chon,. The obtained results are as follows; Budding and blooming of sweet perimmon 'Sur Chon, were earlier in PE film covered house than in control. The earlier covering date was, the sooner was the budding flowering time. PE film covering promoted shoot length but suppressed shoot diameter, leaf length, leaf width and leaf area. As covering date is earlier, shoot diameter and leaf growth were more suppressed. There was no difference in fruit growth between PE film covered house and control. Fruit growth tended to be retard at early stage but acclerated at late stage in cintrol compared with in PE film covered house. The number of fruit dropped was less than 57 of control. Fruit setting was 4.2% to 19.8% higher than 63.4% of control. The earlier the P.E film covering time was, the shorter was the necessary time for fruit maturing. The fruit matured 3 to 11 days earlier than 129 days of control. Fruit weight decreased more in PE film covered house than 156.9g in control. There was no difference in acid content and fruit hardness. Sugar and vitamin C increased significantly compared with those in control. In the non-heating house cultivation, yield per 10a ranged 864 to 1,020kg with PE film covering, which was more than 849kg of control. Thus it was possible to increase farmers' income 2.1 or 3.2 times as much as 936,000 won of control.
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마이크로캡슐 상변화 물질을 이용한 나노공학 초고성능 시멘트 복합체의 열적 및 기계적 성능평가
장준명,허종완,정봉용,김성한 한국복합신소재구조학회 2023 복합신소재구조학회논문집 Vol.14 No.5
Phase change materials (PCMs) have gained attention as latent heat storage materials capable of absorbing or releasing energy during phase transitions. Researchers have explored the integration of various PCMs into construction materials for different temperature applications in recent decades. However, the method of incorporating PCMs significantly influences the mechanical and thermal responses of concrete. Various techniques have been proposed for adding PCMs to concrete, but integrating microencapsulated PCMs (m-PCMs) often reduces the mechanical strength of the resulting concrete. To overcome these limitations, this study focuses on the use of ultra-high performance cementitious composites (UHPCC) because of their exceptional strength and durability properties. We present a novel approach to create a nano-engineered UHPCC that incorporates PCMs, aiming to address the drawbacks of existing technologies. Additionally, multiwalled carbon nanotubes (MWCNTs) were introduced to enhance both the mechanical and thermal performance of the cementitious composite. Our results demonstrate that the inclusion of MWCNTs not only improved the mechanical strength but also enhanced the thermal performance of the cementitious composites.
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Some Remarks on Non-Symplectic Automorphisms of K3 Surfaces over a Field of Odd Characteristic
장준명 영남수학회 2014 East Asian mathematical journal Vol.30 No.3
In this paper, we present a simple proof of Corollary 3.3 in \cite{J} using the fact that for a K3 surface of finite height over a field of odd characteristic, the height is a multiple of the non-symplectic order. Also we prove for a non-symplectic CM K3 surface defined over a number field, the Frobenius invariant of the reduction over a finite field is determined by the congruence class of residue characteristic modulo the non-symplectic order of the K3 surface.
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장준명 충청수학회 2014 충청수학회지 Vol.27 No.2
In this paper, we prove that the image of the represen- tation of the automorphism group of a supersingular K3 surface of Artin-invariant 1 over odd characteristic p on the global two forms is a finite cyclic group of order p + 1. Using this result, we deduce, for such a K3 surface, there exists an automorphism which cannot be lifted over a field of characteristic 0.
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DEFINING FIELDS OF SPECIAL SUPERSINGULAR K3 SURFACES
장준명 영남수학회 2019 East Asian mathematical journal Vol.35 No.5
Inthispaper,weprovethataspecialsupersingularK3surface of Artin invariant σ over a field of odd characteristic p has a model over a finite field of p2σ elements.
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듀얼빔 레이저를 이용한 자동차 도어 모듈용 알루미늄 합금의 용접성에 관한 실험적 연구
김진영,장준명,이주영,이승환,정철영,김대인 대한용접·접합학회 2021 대한용접학회 특별강연 및 학술발표대회 개요집 Vol.2021 No.11
최근 엄격해지는 연비 및 CO₂ 배출 규제에 대응하기 위해 경량소재 사용량이 꾸준히 늘고 있다. 전기자동차의 경우 모터와 배터리팩 무게를 상쇄하기 위해 다양한 경량소재가 사용된다. 특히 알루미늄은 도어, 엔진 후드, 범퍼, 서스펜션 부품까지 적용되고 있고, 이들 부품을 제작하기 위해 레이저 용접이 많이 사용되고 있다. 최근 알루미늄 용접에 적용되고 있는 듀얼빔 레이저 용접 기술은 레이저가 조사되는 영역의 강도 분포를 코어 중심과 주변 링에 대해 독립적으로 변화시킴으로써, 기존 레이저와는 다른 keyhole 거동을 유도하는 방법이다. 본 연구에서는 전기자동차용 알루미늄 도어 모듈에 사용되는 알루미늄 합금 소재에 대해 듀얼빔 디스크 레이저를 사용하여 용접성을 실험적으로 평가하였다.
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