Changes in Leaf Variegation and Coloration of English Ivy and Polka Dot Plant under Various Indoor Light Intensities

Kim, Jongyun,Kang, Seung Won,Pak, Chun Ho,Kim, Mi Seon American Society for Horticultural Science 2012 HortTechnology Vol.22 No.1

<P>Variegated foliage plants are often used in interiorscaping in low light environments. The changes in leaf morphology and coloration of two variegated foliage plants, english ivy (<I>Hedera helix</I> ‘Golden Ingot’) and polka dot plant (<I>Hypoestes phyllostachya</I>), under various light intensities [photosynthetic photon flux (<I>PPF</I>) at 2.7, 6.75, 13.5, 67.5, and 135 μmol·m<SUP>−2</SUP>·s<SUP>−1</SUP>] were investigated to elucidate their optimum indoor light environment. Digital image analysis was used to quantify the changes in variegation area and color in CIELAB color space. The changes in leaf morphology (thickness, length:width) and coloration were different between the two species. In general, growth of both species increased with increasing <I>PPF</I>. English ivy showed no significant changes in leaf variegation under different <I>PPF</I>. Under low <I>PPF</I> (≤13.5 μmol·m<SUP>−2</SUP>·s<SUP>−1</SUP>), newly developed leaves of polka dot plant had reduced leaf variegation (44%, 72%, and 85% variegation loss under 13.5, 6.75, and 2.7 μmol·m<SUP>−2</SUP>·s<SUP>−1</SUP>, respectively). Anthocyanin content in leaves of polka dot plant also decreased with decreasing <I>PPF</I>, which reduced plants’ aesthetic quality. English ivy leaves under high <I>PPF</I> (≥67.5 μmol·m<SUP>−2</SUP>·s<SUP>−1</SUP>) displayed high brightness (L*) and yellowish green color (hue angle < 108°), which diminished its aesthetic value. Smaller leaf size and narrower shape of polka dot plant leaves under high <I>PPF</I> (≥67.5 μmol·m<SUP>−2</SUP>·s<SUP>−1</SUP>) also diminished its aesthetic value. Overall, english ivy performed well in a <I>PPF</I> range from 2.7 to 13.5 μmol·m<SUP>−2</SUP>·s<SUP>−1</SUP>, and polka dot plant required a <I>PPF</I> of at least 13.5 μmol·m<SUP>−2</SUP>·s<SUP>−1</SUP> to maintain its red-purple variegation in the indoor environment.</P>

Classification of Korean Chrysanthemum Species based on Volatile Compounds Using Cluster Analysis and Principal Component Analysis

Kim, Su Jeong,Ha, Tae Joung,Kim, Jongyun,Chang, Dong Chil,Kim, Ki Sun 한국응용생명화학회 2014 Applied Biological Chemistry (Appl Biol Chem) Vol.57 No.6

In the analysis of chemotype relationship among Korean Chrysanthemum species, the volatile compounds in the leaves of 15 taxa were analyzed and identified by gas chromatograph/mass spectrometry. Principal component analysis and cluster analysis used for the grouping based on the volatile compounds. Fifteen taxa of Charysanthemum species were categorized into three groups. Groups I and II included higher ketones than Group III. Group I had five C. zawadskii subspecies: acutilobum, acutilobum var. tenuisectum, acutilobum var. alpinum, lucidum, and coreanum. Five C. zawadskii subspecies were analyzed with main volatile compounds of D-limonene and m-thymol. Group II consisted of four C. zawadskii subspecies including naktongense, yezoense, latilobum, and latilobum var. leiophyllum, and one species C. makinoi. They consisted of main compounds of linalool, cis-chrysanthenol, eugenol, and chrysanthenone. Group III included five C. indicum species and related species: C. indicum, var. albescens, var. acuta, C. boreale, and C. lineare. The present study was able to classify volatile compounds of Korean Chrysanthemum species attributable to major compounds, such as hydrocarbons (sabinene, cymene, ${\beta}$-selinene), alcohols (1-octen-3-ol, cis-chrysanthenol, hinesol), ketones (chrysanthenone, camphor), and esters (cis-sabiene hydrate, trans-chrysanthenyl acetate).

RNAseq-based Transcriptome Analysis of Burkholderia glumae Quorum Sensing

Kim, Sunyoung,Park, Jungwook,Kim, Ji Hyeon,Lee, Jongyun,Bang, Bongjun,Hwang, Ingyu,Seo, Young-Su The Korean Society of Plant Pathology 2013 Plant Pathology Journal Vol.29 No.3

Burkholderia glumae causes rice grain rot and sheath rot by producing toxoflavin, the expression of which is regulated by quorum sensing (QS). The QS systems of B. glumae rely on N-octanoyl homoserine lactone, synthesized by TofI and its cognate receptor TofR, to activate the genes for toxoflavin biosynthesis and an IclR-type transcriptional regulator gene, qsmR. To understand genome-wide transcriptional profiling of QS signaling, we employed RNAseq of the wild-type B. glumae BGR1 with QS-defective mutant, BGS2 (BGR1 tofI::${\Omega}$) and QS-dependent transcriptional regulator mutant, BGS9 (BGR1 qsmR::${\Omega}$). A comparison of gene expression profiling among the wild-type BGR1 and the two mutants before and after QS onset as well as gene ontology (GO) enrichment analysis from differential expressed genes (DEGs) revealed that genes involved in motility were highly enriched in TofI-dependent DEGs, whereas genes for transport and DNA polymerase were highly enriched in QsmR-dependent DEGs. Further, a combination of pathways with these DEGs and phenotype analysis of mutants pointed to a couple of metabolic processes, which are dependent on QS in B. glumae, that were directly or indirectly related with bacterial motility. The consistency of observed bacterial phenotypes with GOs or metabolic pathways in QS-regulated genes implied that integration RNAseq with GO enrichment or pathways would be useful to study bacterial physiology and phenotypes.

Automated Irrigation System Using Soil Moisture Sensor in Horticulture

Jongyun Kim 한국토양비료학회 2014 한국토양비료학회 학술발표회 초록집 Vol.2014 No.6

Volatile Flavor Compounds in the Leaves of Fifteen Taxa of Korean Native Chrysanthemum Species

Kim, Su Jeong,Ha, Tae Joung,Kim, Jongyun,Nam, Jung Hwan,Yoo, Dong Lim,Suh, Jong Taek,Kim, Ki Sun Korean Society of Horticultural Science 2014 원예과학기술지 Vol.32 No.4

This study was conducted to compare the volatile flavor compounds found in the leaves of 15 taxa of Korean native Chrysanthemum species. The volatile flavor compounds from the taxa were collected using a simultaneous steam distillation and extraction technique and were analyzed using gas chromatography/mass selective detector (GC/MSD). A total of 45 volatile flavor compounds were identified with six functional groups: 14 alcohols, 4 ketones, 19 hydrocarbons, 5 esters, 2 acids, and 1 aldehyde. The main functional group in 15 taxa of Chrysanthemum species was alcohols, accounting for 28.7% of volatile flavor compounds, followed by ketones (21.2%) and hydrocarbons (13.2%). Camphor, which is known for its antimicrobial properties, was the most abundant volatile compound (30%) in C. zawadskii ssp. latilobum and var. leiophyllum. In particular, C. indicum subspecies and C. boreale contained ${\alpha}$-thujone, which has outstanding anti-bacterial, anti-cancer, anti-inflammatory, anti-ulcer, and anti-diabetic efficacies. C. indicum var. albescens could be used in perfumes, since it showed 21 times more camphene than C. indicum. In addition, C. indicum var. acuta contained a fairly high content of 1,8-cineole, which has an inhibitory effect on mutagenesis. C. lineare contained only pentadecanoic acid compounds, whereas other taxa hexadecanoic acids. Overall, the Korean native Chrysanthemum species had considerable variation in volatile flavor compounds in their leaves. This study provides a good indication of specific potential use for various applications.

Isoform- and receptor-specific channel property of canonical transient receptor potential (TRPC)1/4 channels

Kim, Jinsung,Kwak, Misun,Jeon, Jae-Pyo,Myeong, Jongyun,Wie, Jinhong,Hong, Chansik,Kim, Sung-Young,Jeon, Ju-Hong,Kim, Hyun Jin,So, Insuk Springer-Verlag 2014 Pfl ugers Arch Vol.466 No.3

초등학생의 디지털 리터러시 활동 실태 조사 연구

김종윤 ( Kim Jongyun ),오은하 ( Oh Eunha ),김희동 ( Kim Heedong ) 국어교육학회 2017 國語敎育學硏究 Vol.52 No.2

이 연구의 목적은 초등학생들의 디지털 리터러시 활동 실태를 조사하여 초등학생들의 디지털 환경 노출 정도와 활동 양상에 대한 기초적인 연구 자료를 산출하는 것이다. 이를 위해 2016년 5월과 6월에 우리나라 초등학교 3~6학년 총 10,111명을 대상으로 설문을 실시하였다. 조사 결과 98.3%의 가정에 인터넷이 연결되어 있다고 응답하였고, 컴퓨터보다는 스마트폰에, 주중보다 주말 활동에 더 많은 시간을 보냈다. 활동 빈도는 동영상 보기가 가장 높게 나타났고, 그 다음으로 메신저, 게임, 정보검색 순으로 낮아졌다. 활동의 목적으로는 여가 목적이 가장 높게 나타났고, 친교 목적은 4.6%로 가장 낮게 나타났다. 이 중 여가 목적과 학습 목적의 활동에는 양상의 차이가 있었다. 3, 4학년과 5, 6학년 사이, 대도시와 중소도시·읍면지역 사이에 편차가 나타났으나, 성별 차이는 유의하지 않았다. 이 차이는 이후 학업 성취 등 다른 요인들에 구조적으로 영향을 미칠 수 있다는 점에서 주목할 필요가 있다. 이를 바탕으로 관련 디지털 리터러시에 대한 제언 및 논의점을 제시하였다. The purpose of this study aims to provide basic research data about Korean elementary students` digital literacy activities. The 10,111 3rd to 6th grade students participated in this survey. The students spent more time in using smart phones than computers, and they used both devices more during weekends than weekdays. On a daily basis, students` digital literacy activities were ordered: watching videos was the highest activities, and the next frequent activities were instant messaging, gaming, and information searching. Nearly half students did digital activities for recreational purpose. Only less than 5% students participated in the digital activities for social purposes. There were response gaps between 3rd and 4th grade students and 5th and 6th ones, and between big cities and other regions. However, gender differences were insignificant or negligible. The findings from this study need to be considered because the differences of digital literacy environments and activities may influence students` academic achievements and other factors.

FDR 토양수분센서의 올바른 이용을 위한 Calibration 방법

김종윤(Jongyun Kim),정선옥(Sun-OK Chung),이동훈(Donghoon Lee),조영열(Young Yeol Cho),장승호(Seung-Ho Jang),최종명(Jong-Myoung Choi) 한국원예학회 2014 한국원예학회 학술발표요지 Vol.2014 No.10

라이프로그와 수면의 정보 연관성을 활용한 수면의 질 예측 알고리즘

최종윤(Jongyun Choi),김혜수(Hyesu Kim),박서연(Seoyeon Park),정찬혁(Chanhyuk Jung),정현규(Hyeongyu Jeong),김민수(Minsu Kim),양근석(Geunseok Yang) 한국정보과학회 2023 한국정보과학회 학술발표논문집 Vol.2023 No.6

연령대와 지형경사를 고려한 근린생활권 도시녹지 보행 접근성 평가 - 청주시 원도심지를 대상으로 -

김종환(Kim, Jonghwan),김종윤(Kim, Jongyun),윤성수(Yoon, Sungsoo),문영주(Moon, Youngjoo),강완모(Kang, Wanmo) 한국지적정보학회 2021 한국지적정보학회지 Vol.23 No.3

녹지에 대한 보행 접근성은 도시민의 육체적·정신적 건강 향상에 중요하다. 하지만 거주 환경이나 신체적 조건에 따라 시민들이 접근 가능한 도시녹지 서비스의 수준은 달라질 수 있다. 본 연구는 청주시 원도심 지역을 대상으로 보행로의 경사도와 연령 그룹별(10세 이상 49세 이하의 청·장년층, 50세 이상 69세 이하의 중년층, 70세 이상의 노년층) 보행속도를 고려하여 도시녹지 접근성을 분석하였다. 접근성 분석에서 경사도가 고려되지 않았을 때 일부 노년층 거주자를 제외한 모든 연령층은 도시녹지에 10분 내로 접근할 수 있었다. 그러나 경사도를 고려했을 때 도시녹지에 10분 내로 접근할 수 없는 사람들이 중년층에서도 드러났다. 또한, 산지형태의 면적이 큰 임목지가 분포하는 행정구역은 경사도가 높은 보행로가 임목지뿐만 아니라 주변 공원으로 연결되기 때문에 상대적으로 보행 접근성이 낮은 것으로 나타났다. 이러한 결과들은 도시녹지 보행 접근성 평가 및 향상에 있어 보행능력에 영향을 끼치는 경사도와 시민의 연령도 고려해야 함을 시사한다. The pedestrian accessibility of urban green spaces is crucial in terms of improving mental and physical health of citizens. The level of services from green spaces accessible to citizens may vary depending on their residential locations or physical status. This study analyzes the pedestrian accessibility of green spaces in the old town area of Cheongju-si considering the slope of pedestrian roads and walking speed of different age groups (the young: 10-49 years, the senior: 50-69 years, and the elderly: over 70 years). All age groups except for a few elderly residents can access to urban green spaces in 10 minutes when the slope is not considered in the accessibility analysis. However, people, who cannot access to urban green spaces in 10 mins by walking, were also revealed in the senior group when considering the slope. In addition, administrative districts accounted for large mountainous areas can have relatively low pedestrian accessibility, because the high-slope pedestrian paths were connected to urban green spaces. Our results suggest that for assessing and improving the pedestrian accessibility of urban green spaces, the slope and ages, which affect on walking performance, should be considered.