Production of Synthetic Seeds by Encapsulating Gametophytes in Matteuccia struthiopteris, Edible Ferns

Hamin Lee,Bo-Kook Jang,Kyungtae Park,Ju-Sung Cho,Cheol Hee Lee 한국원예학회 2021 한국원예학회 학술발표요지 Vol.2021 No.10

Matteuccia struthiopteris (L.) Tod. is one of the edible ferns consumed globally. However, efficient M. struthiopteris propagation methods have not been developed, and current cultivation methods based on rhizomes are labor intensive. The aim of the present study was to investigate the optimal conditions for the mass propagation of M. struthiopteris through synthetic seed technology. Sporophylls of M. struthiopteris were harvested from a greenhouse in Chungbuk National University, South Korea, in August 2014. After then using gametophytes obtained through in vitro spore germination and then used for synthetic seed experiments. To confirm the SFG (synthetic seeds using fern gametophyte) production conditions, the concentration of sodium alginate (1 ‒ 4%) and the density of gametophytes (2, 5, 7, 10 g) were adjusted. PGRs (gibberellic acid, 3-indoleacetic acid, and kinetin) were added in 5 and 10 mg·L<SUP>-1</SUP> concentration for the growth enhancement of formed sporophytes from SFG. The SFG were sown per cell in a plug tray filled with the soil substrate. For each treatment, 50 cells plug trays were repeated three times, with a completely randomized design in a plastic box. The treatments were cultivated for 12 weeks under a temperature of 25 ± 1.0°C, a light intensity of 43 ± 2.0 μmol·m<SUP>-2</SUP>·s<SUP>-1</SUP>, and a photoperiod of 16/8 h. In the present study, when SFG were sown in the soil substrate, the homogenized gametophyte inside the SFG was regenerated and began to emerge three weeks after sowing. After four weeks, the SFG surface have regenerated completely into a normal gametophyte. After 12 weeks of sowing, sporophytes were formed under all concentrations of sodium alginate. The SFG have shown to be successfully produced using the gametophytes. Conditions of SFG production were also established which facilitated the formation of numerous sporophytes. The results of gametophytes of 2g encapsulated with 2% sodium alginate, they formed a uniform spherical bead shape, and a relatively high rate of sporophyte formation (82.7%) was observed, and the number of sporophytes per SFG was 7.3. Additionally, only the number of sporophytes per SFG added with 10 mg·L<SUP>-1</SUP> GA₃ had increased to 8.9. Therefore, the SFG production method in the present study is practical and suitable for industrialization and can be used as a substitution for the cultivation method of economically important ferns. In addition, it is expected that such methods could be applied to various ferns besides M. struthiopteris.

Structure and Suppression of Nonpremixed Counterflow Flames

Hamins, Anthony,Park, Woe-Chul 한국화재소방학회 2003 한국화재소방학회논문지 Vol.17 No.3

화염변형률과 소화약제의 첨가 및 부력이 비예혼합 대향류 화염의 구조와 소화에 미치는 영향을 조사하기 위해 필라멘트와 열전대를 이용한 실험과 Oppdif 및 FDS를 사용한 수치해석을 수행하였다. 소화농도에 가까운 메탄-공기의 확산화염에 대하여 2.2초의 무중력 낙하실험과 정상중력에서의 측정결과를 수치모사의 결과와 비교하였다. 변형률 7 s^(-1)에서 100s^(-1)까지 무중력상태에서 측정한 임계소화농도로부터 질소의 임계소화농도에 최대치가 있음을 확인하였다. 또한, 부력의 효과, 즉, 화염의 곡률과 두께 변화를 FDS의 계산결과로 확인하였다. 무중력상태에서 화염의 최고온도와 그 위치에 대한 실험치와 계산값이 일치함을 알 수 있었다. Measurements with filaments and thermocouples and computations with Oppdif and FDS were carried out to investigate the impact of flame strain, agent addition, and buoyancy on the structure and extinction of nonpremixed counterflow flames. Measurements through 2.2 s drop tests in microgravity conditions and experiments in normal gravity conditions were compared with the results of computations. For the global strain rates 7 s^(-1) through 100 s^(-l), the turning point behavior in the critical nitrogen concentration at 0-g was confirmed. The effects of buoyancy, that is, changes in the flame curvature and thickness were also confirmed by the computations with FDS. There was agreement in the peak flame temperature and its position between the computations and the measurements in the near extinction methane/air diffusion flames in microgravity.

Emission Characteristics of Shape-Engineered InAs/InAlGaAs Quantum Dots Subjected to Thermal Treatments

Hamin Lee,Cheul-Ro Lee,Haeng-Keun Ahn,Jin Soo Kim,Mee-Yi Ryu 한국물리학회 2016 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.69 No.1

We indirectly evaluated the inter-diffusion behaviors of group-III elements at the interface between shape-engineered (SE)-InAs/In0.52Al0.24Ga0.24As quantum dots (QDs) and In0.52Al0.24Ga0.24As (InAlGaAs) barriers by investigating the optical properties. Rapid thermal annealing (RTA) was carried out for five stacks of SE-InAs/InAlGaAs QDs separated by an InAlGaAs spacer under temperatures ranging from 650 to 800 C. The emission wavelength of the SE-QDs subjected to thermal treatment was red-shifted from that for the as-grown QDs. For a RTA temperature of 700 C, the emission wavelength was measured to be 1507 nm at room temperature (RT), which was red-shifted by 3 nm compared to that of the as-grown sample (1504 nm). At an annealing temperature of 800 C, the emission wavelength was 1506 nm, which is still longer than that of the as-grown sample. This behavior is quite different from that of an InAs/GaAs QD system. The RT photoluminescence (PL) yield of the SE-InAs/InAlGaAs QDs subjected to thermal treatment was first enhanced at temperature up to 700 C and then decreased slightly with further increasing RTA temperature. The PL intensity of the QDs for a RTA temperature of 700 C was 8.8 times stronger than that of the as-grown sample.

A case of Galloway-Mowat syndrome with novel compound heterozygous variants in the WDR4 gene

Hamin Kim,Hyunjoo Lee,Young-Mock Lee 대한의학유전학회 2020 대한의학유전학회지 Vol.17 No.2

The combination of central nervous system abnormalities and renal impairment is a notable characteristic of Galloway- Mowat syndrome (GAMOS), a disease which often accompanies microcephaly, developmental delay, and nephrotic syndrome. Many subtypes exist having various phenotypes and genotypes, and many genetic causes are still being identified. An 18-month-old boy first visited our clinic for seizure, delayed development, and microcephaly. During follow-up visits he developed proteinuria and nephrotic syndrome at the age of 6. Nephrotic syndrome became refractory to treatment. These phenotypes were suggestive of GAMOS. Next generation sequencing was performed for genetic analysis and revealed novel compound heterozygous variants in the WDR4 gene: c.494G>A (p.Arg165Gln) and c.540C>G (p.Ile180Met). This is the first case in Korea of GAMOS involving the WDR4 gene.

Enhancing Zanthoxylum schinifolium Seed Oil Quality and Bioactivity through Seed Pre-treatments

Hamin Lee,Kyungtae Park,Yu-Jin Kim,Soyeon Park,Jihun Lee,Kichan Kim,Ju-Sung Cho 한국원예학회 2023 한국원예학회 학술발표요지 Vol.2023 No.10

Estimation of Leaf Area Index of Sweet Pepper Using a Process based Model

Hamin Yoon,Taewon Moon,Jung Eek Son 한국원예학회 2022 한국원예학회 학술발표요지 Vol.2022 No.5

Nonlinear Effect of Information and Communication Technology on Economic Growth Convergence : the Case of 36 Asian Countries

HaMin Hong,Jeongseok Song 한국제도경제학회 2020 제도와 경제 Vol.14 No.1

지난 수 십년 동안 정보통신 기술은 다양한 산업에서의 생산성을 제고하였다. 본 논문은 1990년부터 2017년 기간에 걸친 아시아 36개국의 패널 자료를 이용하여, 정보 통신기술을 반영한 경제성장 수렴에 대한 실증분석을 실시한다. 정보통신기술은 그 자체로써 생산성 향상의 직접적 요인으로 작용하는 동시에 기술전파 요인으로써 간접 적으로 생산성 향상에 기여한다. 특히 기술전파 요인이라는 차원에서, 정보통신기술이 기술확산의 원천으로 작용한다는 점에 대한 많은 관심이 필요하다. 그러나 기술확산에 대한 기존의 많은 연구에도 불구하고, 경제성장 수렴에 대한 논의에 있어서 정보통신 기술을 기술확산에 접목한 이론적 연구는 많지 않다. 이러한 선행연구의 미비한 부분 에 착안하여, 본 연구는 정보통신기술과 경제성장률 간의 관계를 살펴보는 데 있어서 비선형 함수 구조를 설정한다. 본 논문은 준모수적 추정 방법의 일종인 부분선형모형 을 이용하여 정보통신기술과 경제성장수렴의 관계를 살펴보고자 한다. 또한, 본 논문 은 부분선형모형의 추정결과와 고정효과모형의 추정결과를 비교한다. 본 연구의 실중 분석 결과에 따르면 정보통신기술 요인을 비선형함수에 포함시켜 이를 통제할 경우 회귀분석모형의 종속변수인 경제성장률의 관측주기가 낮아짐에 따라 1인당 GDP 설명 변수의 회귀분석계수 추정값은 그 절대값이 증가한다. 또한, 부분선형모형 추정으로부 터 도출된 1인당 GDP 설명변수의 회귀분석계수 추정값은 고정효과모형 추정 결과에 비해 그 값이 전반적으로 더 크다는 결과를 발견한다. 이러한 분석결과는 정보통신기 술 변수의 비선형 특성을 고려할 때 경제성장수렴 현상을 보다 더 잘 이해할 수 있다는 시사점을 제공한다. 또한 본 논문은 부분선형모형의 모형설정이 적합한 지 여부를 검정하며, 그 검정결과로부터 정보통신기술을 비선형모형으로 설정하는 것이, 선형모 형으로 설정하는 것에 비해 더 적합함을 발견하였다. 또한, 본 논문은 비선형모형을 곡선 형태로 추정할 경우 그 형태가 역 U자임을 발견한다. 이러한 비선형함수의 형태는 정보통신기술이 경제성장에 기여하는데 있어서, 최적값이 존재함을 암시한다. 이상 의 결과들을 종합할 때 본 연구는 비선형 모형이 정보통신기술과 경제성장의 관계를 파악하는데 있어서 유용하다는 시사점을 제공한다. Over the past decades, many economies observed that the development of Information and Communication Technology (ICT) has increased productivity in various industries. This paper empirically examines an economic growth convergence under the presence of the ICT by using panel data for 36 Asian countries from 1990 to 2017. The ICT can directly work as a driving force for productivity and indirectly as a technology propagator. As a technology propagator, the ICT deserves more attention as a source of technology diffusion. Despite many existing studies on the diffusion, theoretical studies have not yet incorporated the ICT into the diffusion issue in discussing the growth convergence. Responding to the unfilled gap in the literature, we impose a nonlinear functional form on the relation between the ICT and economic growth rate. In this paper, we employ a semi-parametric partially linear model (PLM) to relate the ICT elements to the growth convergence. In this paper, we compare fixed-effect results to the PLM results. Our results show that, controlling the ICT nonlinearly, the absolute size of the estimates for the GDP per capita increases as the frequency of growth rates becomes lower. We also find that, for the GDP per capita, the PLM estimates’ absolute values are greater relative to the fixed-effect results for all the frequencies. Our findings imply that considering nonlinearity of the ICT variable enhances understanding of economic growth convergence. We also perform the specification-fit test for PLM estimation and find that the nonlinear specification of the ICT variable is suitable. Further, we observe that the fitted curves of nonlinear functions are hump-shaped for all the frequencies. Then, it is implied that there can exist optimal level of the ICT for its contribution to the economic growth. In sum, all the results suggest that nonlinear modeling is a suitable empirical strategy for the relationship between the ICT and economic growth.

Comparison of Antioxidant Activity of Peony Seed Oil and Cake

Hamin Lee,Jihun Lee,Kichan Kim,Ju-Sung Cho 한국원예학회 2022 한국원예학회 학술발표요지 Vol.2022 No.11

Effect of Hydropriming and Light Quality Treatments on Sprout Growth and Antioxidant Activity in Brassica oleracea var. capitate Seeds

Hamin Lee,Boran Ji,Bo-Kook Jang,Kyungtae Park,Sang Yeob Lee,Kyunggu An,Ju-Sung Cho 한국원예학회 2022 원예과학기술지 Vol.40 No.2

A Comparative Study on the Quality Characteristic and Antioxidant Activity according to Oil Extraction Methods of Cabbage and Kohlrabi Seeds

Hamin Lee,Boran Ji,Bo-Kook Jang,kyungtae Park,Heon Sang Jeong,Ju-Sung Cho 한국원예학회 2022 한국원예학회 학술발표요지 Vol.2022 No.11