사료용 피의 건답과 무논 파종 시 입모 및 초기생육특성

안석현,정남진 韓國作物學會 2014 한국작물학회지 Vol.59 No.1

제주피의 발아특성 및 파종 심도에 따른 초기 생육 특성을 조사한 결과를 요약하면 다음과 같다. 가. 사료피 1호 종자는 15℃ 이상에서 발아가 가능하였으며, 10-25℃의 범위에서 20℃에서 가장 높은 발아율을 보였다. 나. 입모율은 담수와 직파에서 모두 20℃에서 가장 높았으며, 담수직파에서 평균 입모율은 5.9%, 건답직파는 70.5%로 나타났다. 다. 사료피 1호의 출아가 가능한 종자의 최대 파종 깊이는 담수직파에서 15, 20, 25℃에서 0.5, 1.8, 1.5 cm, 건답직파는 각각의 온도에서 9.5, 10.0, 9.9 cm로 파종조건과 온도에 따라 변이를 보였다. 라. 사료피 1호는 담수와 건답직파 모두에서 온도와 관계없이 파종심도와 중배축장이 정의상관관계를 보여, 출아에 중배축 신장이 가장 크게 영향을 미치고 있을을 알 수 있다. This research was carried out to determine the characteristics of germination in relation to temperature, and seedling emergence and growth affected by soil moisture in forage millet. The seeds of forage millet could germinate at more than 15℃ at the rate of 0, 90.5, 97.3 and 96.8% respectively 10 days after seeding at 10, 15, 20 and 25 ℃. The result showed that the temperature needs to be 15 ℃ or more for the seeds to germinate. The effects of seeding depth on the growth characteristics and emergence of millet seed were investigated in waters and direct seeding methods by thoroughly mixing the seed and soil. In water treatment, the emergence rates were 3.7% at 15 ℃, 7.6% at 20 ℃, 6.3% at 25 ℃, while direct seeding treatment showed the emergence rates of 65.6, 75 and 71% at 15, 20 and 25 ℃, respectively. At 15, 20, and 25 ℃, seeds in water seeding could germinate at 0.5, 1.8, 1.5 cm of soil depth, while in direct seeding, they could germinate at the depth of 9.5, 10.0, 9.9 cm. When the initial growth characteristics of the seeds were investigated, there was positive correlation between seeding depth and mesocotyl length in both water and direct seed methods. Growth and development in terms of leaf age, root length, coleoptiles and mesocotyl length, and plant height were found maximum at 0.5 cm soil depth for water seeding, and 3-5 cm soil depth for direct seeding. Results showed that there were close relationship among temperature, soil depth and moisture acquiring methods, and the combination of these factors greatly affected the initial growth characteristics and development of millet seeds. It can be concluded that, to get good seedling stand and germination of millet seed, millet should grown in field condition at the depth of 0.5 cm or less for water seeding, and 3-5 cm for direct seeding method.

머신러닝 기반 IoT 장치를 식별하는 기법 분석

안석현,박민수,조성제,김홍근 한국차세대컴퓨팅학회 2023 한국차세대컴퓨팅학회 학술대회 Vol.2023 No.06

인터넷 기술의 발전으로 인하여 IoT 장치 사용이 증가함에 따라 발생하는 보안 위협도 증가하고 있다. 이러한 보안 위협을 해결하거나 완화하기 위해 IoT 장치 식별이 중요하다. 본 논문에서는 머신러닝 기반으로 IoT 장치를 식별하는 4가지 기법을 비교·분석하여, 각 기법에서 사용된 특징 정보, 머신러닝 모델, 데이터 셋, IoT 장치 등을 살펴본다. 분석을 통해 IoT 장치 식별에 효과적인 특징 정보, 머신러닝 모델을 제시한다.

‘더 크게, 더 빨리 경쟁’의 종식 곡면기술과 해상도, 차원 다른 경쟁_2013 CES (Consumer Electronic Show) 참관기

안석현 한국언론진흥재단 2013 新聞과 放送 Vol.- No.506

학습 환경에서 색온도의 선호도가 자율신경계에 미치는 영향

안석현,김희창,윤현아,허남훈 한국산업경영시스템학회 2019 한국산업경영시스템학회 학술대회 Vol.2019 No.추계

졸겔법으로 합성된 Me-TiO₂-sol의 광촉매 산화반응을 이용한 실내오염물질 제거활성 연구

안석현 ( Suk-hyun Ahn ),정민기 ( Min-gie Jung ),정진도 ( Jin-do Chung ) 한국환경기술학회 2020 한국환경기술학회지 Vol.21 No.6

In this study, a TiO₂-sol photocatalytic study was conducted to remove CO, HCHO, and CH₃CHO corresponding to various indoor pollutants. After coating on the inner surface of pyrex tube of various prepared TiO₂-sol photocatalysts, the coating property was confirmed through FE-SEM analysis, and excellent removal performance was confirmed in uniform coating properties of TiO₂ particles. However, the studied TiO₂-sol photocatalyst has very low reaction activity to CO and HCHO, and can be solved through calcination/reduction heat treatment process by adding a noble metal Pt to solve this. Particularly, it was confirmed that the Pt/TiO₂-sol photocatalyst increased the formation and dispersion of the surface Pt⁰ species through a reduction process, thereby improving the removal performance of CO, HCHO, and CH₃CHO.

잇꽃 종자의 발아에서 제(Hilum)의 형태적 특성과 기능

안석현(Seok-Hyeon Ahn),정남진(Nam-Jin Chung) 한국원예학회 2013 원예과학기술지 Vol.31 No.1

This research was carried out to clarify the germination characteristics with reference to hard seed coat in safflower. Morphologically, seed coat surface has hilum and micropyle which were evident during seed development stage. In the flower of developing seeds, the hilum area is connected with placenta of maternal tissue while the micropyle area is connected with the style of pistil. When the seeds imbibed, the hilum surface began to crack and the embryo protrudes through the hilum. To investigate the route for moisture absorption and gas exchange on the seed coat, the hilum and the micropyle were artificially sealed by paraffin. The seeds whose hilum were sealed could not germinate, which indicates that the exchange of moisture and oxygen takes place through hilum in safflower seeds. The germination was tested at 15℃, 20℃, and 25℃ by three substrates with different moisture conditions; top of paper method (hilum submerged in water), between-paper method, and soil seeding. The germination percentages were31.3% at 15℃, 15.7% at 20℃ and 6.0% at 25℃ in the top of paper method; and 45.5% at 15℃, 30.0% at 20℃ and 14.0% at 25℃ in the between-paper method; and 80.0% at 15℃, 77.0% at 20℃ and 78.0% at 25℃ in the soil seeding, respectively. When the internal structure of hilum was investigated through SEM, it was found out consisting of vascular bundle element. In conclusion, the hilum of safflower seed was closely related with water absorption and gas exchange during initial germination process.

분산전원의 고장 전류 영향 분석

안석현(Seok-Hyun An),손승완(Seung-Wan Son),김인수(Insu Kim) 대한전기학회 2021 대한전기학회 학술대회 논문집 Vol.2021 No.7

왕우렁이를 이용한 벼 친환경재배포장에서 벼와 왕우렁이 생장에 대한 중간낙수 효과

황기철,안석현,정남진 한국유기농업학회 2013 韓國有機農業學會誌 Vol.21 No.3

This study was performed to examine whether it is possible to promote rice growth by midsummer drainage without damage of golden apple snails in environmentfriendly rice farming. The effect of drainage on the life of snails was examined in a greenhouse before the filed experiment. Spats (young shells) of snails survived 100% at 12 days after drainage, and 93.3% at 15 days after drainage. The midsized shells survived 100% at 9 days, 93.3% at 12 days, and 86.6% at 15 days after drainage. In the field experiment, 10-days drainage did not affect the snail population and there was no significant difference of weeding activity of snails between the midsummer drainage treatment and the continuous submerged treatment. The plant height and the effective tiller number in the midsummer drainage treatment were higher than those of the continuous submerged treatment. The rice yield of midsummer drainage plot was 511kg/10a, which was 66kg/10a higher than 445kg/10a of continuous submerged plot. In conclusion, midsummer drainage could increase rice growth and yield without damage of golden apple snails in the environment-friendly rice farming.

운영 기술 환경에서 수동적 스캐닝 기반 장치 식별의 비교 분석

박민수,안석현,박세연,조성제,김홍근 한국소프트웨어감정평가학회 2023 한국소프트웨어감정평가학회 논문지 Vol.19 No.3

보안 위험을 완화하기 위해서는 조직의 자산을 식별하고 보안 취약점을 제거해야 한다. 자산 식별을 위해기존 IT 환경에서는 능동적 스캐닝과 수동적 스캐닝 기법을 적용해왔다. 본 논문에서는 먼저 기존 네트워크스캐닝 방식을 OT 시스템에 적용할 때의 문제점을 살펴본다. 수동적 스캐닝 기법을 적용하여 OT 장치를 식별할 때 필요한 네트워크 트래픽의 특징 정보를 선택하기 위해, OT 장치와 유사한 특성을 가진 IoT 장치 식별 연구에서 사용된 네트워크 트래픽 특징(TTL, TCP Window Size, IAT 등)을 분석하였다. 또한, 네트워크트래픽 특징 정보의 유형을 식별하고, 이를 기반으로 효과적인 OT 장치 식별을 위한 앞으로 해결해야 할 연구 이슈들을 제시한다. To mitigate security risks, organizational assets must be identified and security vulnerabilities eliminated. active scanning and passive scanning techniques have been applied in existing IT environments to identify assets.. In this paper, we first examine the problems of applying the existing network scanning methods to OT systems. Then, to select network traffic features required when identifying OT devices by applying a passive scanning, we analyze network traffic features (TTL, TCP Window Size, IAT, etc.) used in prior studies on identifying IoT devices which have similar properties to OT devices. In addition, we recognize the types of network traffic features, and present research issues to be addressed for effective identification of OT devices.

OT 네트워크에서 자산 식별을 위한 네트워크 트래픽 특성 분석

박민수,안석현,조성제,김홍근 한국차세대컴퓨팅학회 2023 한국차세대컴퓨팅학회 학술대회 Vol.2023 No.06

디지털 전환으로 인해 스마트 전력망, 스마트 빌딩, 스마트 팩토리 등의 ‘스마트 X’ 기술로 인해 OT(Operational Technology) 네트워크가 인터넷과 연결되고 있다. 이로 인해 OT 네트워크에 대한 사이버 공격이 증가하고 있다. 사이버 공격을 방어하기 위한 시작점은 조직의 네트워크 내 자산을 식별하는 것이다. OT 시스템의 자원 부족과 실시간성의 요구로 인해, 전통적인 IT 시스템에서 사용되었던 자산 식별 방법을 OT 시스템에 적용하는 것은 한계가 있다. 본 논문에서는 OT 네트워크에서 자산을 식별하기 위한 네트워크 트래픽 특징 정보를 선정하고, 이를 활용하여 OT 장치를 식별할 수 있음을 보인다.