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윤성일,남숭환,이봉하 공주영상정보대학 2002 논문집 Vol.9 No.-
OOP 언어인 Java, C++는 대표적인 객체지향 언어로서 널리 사용되고 있다. 이들 언어의 특징은 c1ass를 이용하며 다양한 cast방법에 의한 효율적인 프로그래밍 작성이 용이하다는 것을 볼 수 있다. 본 연구에서는 cast의 효율적인 설계방법과 작성기법들에 대하여 연구하였다. 클래스를 이용하여 모듈을 세분화 조립하는 경우 프로그램 성능향상에 현저히 드러난다. 또한 프로그램활용 목적에 따라 유용성, 이식성, 확장성 등을 고려하여 시스템을 디자인하는 것이 중요하다는 것이다. 쉬운 조작으로 많은 효과를 이를 수 있는 것이 COP언어의 특징이다. OOP 언어는 또한 컴파일 시간과 실행시간에 리턴하는 값이 다른 경우 프로그램에 치명적인 영향을 미치기 때문에 class를 이용한 casting 방법을 이용하는데 상당한 주의가 요구되는 것을 위의 예로 보았다. 이로서 향후 연구과제는 실행시간 리턴 값, 오브젝트 참조 값, 메모리의 효율적 사용방법을 위해 새로운 cast 연산자들인 const_cast, dynamic_cast, reinterpret_cast, static_cast의 효율적인 기능을 분석하는데 있다.
Suong Tuyet Thi Ha,Hyung-Won Choi,Byung-Chun In,Yeon-Ok Jung,Jin-Hee Lim 한국화훼학회 2017 화훼연구 Vol.25 No.3
Cut roses often have a short vase life due to water stress and ethylene damage under unfavorable postharvest conditions. In this study, we investigated the effect of various pretreatment solutions on the vase life and postharvest quality of the cut rose cultivar ‘Jinny’ (Rosa hybrida L.). Cut roses were pretreated with eight different preservative solutions for 10 hours: aluminum sulfate (AS), Chrysal (CHR), FloraLife (FLR), lysosome (LYS), MS-1 (MS1), MS-2 (MS2), silver n itrate ( SN), a nd s ilver t hiosulfate ( STS). We found that pretreatment with all solutions except LYS prolonged the vase life and improved the postharvest quality of the cut roses. Among these, STS was the most effective pretreatment solution, significantly extending the vase life from 11.8 days (control) to 19.9 days, retaining the initial fresh weight and a positive water balance for longer, and inhibiting microbial growth in the vase. STS also enhanced the water uptake rate, and maintained the high chlorophyll and soluble sucrose contents in the leaves of the cut rose flowers. In addition, we found that MS1 and MS2, which are natural plant extracts, had strong antimicrobial effects and consequently prolonged the vase life of cut roses by more than 4 days compared with the control. Therefore, MS1 and MS2 can be considered as alternative preservatives in the cut flower industry.
Suong Tuyet Thi Ha,Minjung Kwon,Toan Khac Nguyen,임진희 한국화훼학회 2019 화훼연구 Vol.27 No.3
We examined the efficacy of various pretreatment solutions on the postharvest longevity and quality of ‘Hessa’ cut spray roses (Rosa hybrida L.) to develop an inexpensive and innocuous preservative solution for the cut flower industry. Cut flowers were pretreated with 4 preservatives for 10 hours: Scutellaria baicalensis Georgi extract (SC) at 300 μL·L-1, hydrosol (H), S. baicalensis Georgi extract 300 μL·L-1 + sucrose 1% (SC + Suc), and H + sucrose 1% (H + Suc). The results showed that pretreatment with all the solutions except H + Suc improved the postharvest longevity and extended the longevity of cut rose flowers. We found that 300 μL·L-1 of SC was the most effective preservative, which significantly prolonged the postharvest longevity in cut flowers from 9.7 days (control) to 14.1 days. The beneficial effects of 300 μL·L-1 SC pretreatment were associated with inhibition of bacterial accumulation at the basal portion of cut stems, enhanced water uptake, improved fresh weight, and a positive water balance. SC also effectively maintained chlorophyll fluorescence ratios in the leaves and reduced water stress in cut roses. The results demonstrate the potential of SC as an alternative preservative in the cut rose flower industry.
Suong Tuyet Thi Ha,임진희,인병천 한국원예학회 2019 원예과학기술지 Vol.37 No.2
The plant hormone ethylene regulates diverse aspects of plant growth and development, includingflower senescence and abscission. In cut roses, the impact of ethylene on flower senescence variesgreatly depending on the ethylene sensitivity of the floral organs, which is determined by the varietyof the rose. To understand the relationship between ethylene synthesis and sensitivity in floral organs,we examined tissue-specific differences in gene expression and regulation using two rose cultivarswith differing ethylene sensitivity. We monitored the expression patterns of genes related to ethylenebiosynthesis (RhACS1, RhACS2, RhACS3, RhACS4, and RhACO1), receptor (RhETR1, RhETR2,RhETR3, RhETR4, and RhETR5), and signaling (RhCTR1, RhCTR2, RhEIN3-1, RhEIN3-2, andRhEIN3-3) in various floral organs of ethylene-sensitive (SENS; ‘All For Love’) and -insensitive(INSENS; ‘Peach Valley’) rose cultivars. The expression of ethylene-related genes in all floral organswas generally higher in SENS than INSENS cultivars. The presence of exogenous ethylene acceleratedthe accumulation of RhACS1-4 and RhACO1 transcripts in SENS petals and leaves and in INSENSstamens and stigmas, leading to an increase in RhETR1-5 expression in the floral organs. Meanwhile,RhCTR1-2 expression decreased considerably, with a consequent increase in RhEIN3 transcripts inSENS petals and leaves and INSENS stamens and stigmas. The differential expression of ethylenerelatedgenes in the same tissues indicates that the site of initiation of the ethylene-inducible responsesvaries among the varieties, and this is probably related to the ethylene sensitivity of the flowers.
Suong T. T. Ha,Jin-Hee Lim,Byung-Chun In 한국원예학회 2019 원예과학기술지 Vol.37 No.1
In cut roses (Rosa hybrida L.), the vase life of ethylene-sensitive cultivars (SENS) is determined by ethylene, and that of ethylene-insensitive cultivars (INSENS) is closely related to water relations. This variation in senescence among rose cultivars makes it difficult to prolong the vase life of cut roses after harvest. In this study, we investigated the combination effect of germicide and ethylene inhibition on the postharvest characteristics of cut rose ‘Matador’ and ‘Dolcetto’ cultivars. Cut roses were treated with three preservative solutions: sodium hypochlorite (Cl), sodium hypochlorite + aminoisobutyric acid (ClA), and sodium hypochlorite + aminoisobutyric acid + 1-methylcyclopropene (ClAM), subsequently exposed to ethylene. We found that all treatments extended the vase life and improved the postharvest quality in the both rose cultivars. Among these, ClAM was the most effective treatment solution, significantly extending the vase life by 4.3 days in ‘Matador’ (SENS) and 4.7 days in ‘Dolcetto’ (INSENS) compared with control flowers. ClAM also effectively inhibited bacterial growth in the vase, enhanced solution uptake, and maintained the initial fresh weight and a positive water balance for longer periods. In addition, we found that ClAM strongly inhibited ethylene-induced petal senescence by suppressing the transcript levels of RhACS2 and RhACO1 in the both rose cultivars. These results suggest that ClAM can be used in a wide range of rose cultivars to prolong the longevity of cut roses due to its combination effects with inhibition of ethylene damage and improvement of water absorption.
Suong Tuyet Thi Ha,함지영,최봉수,인병천 한국화훼학회 2023 화훼연구 Vol.31 No.1
The effects of light intensity and external sucrose on the vase life of cut roses were estimated by monitoring the net photosynthesis and chlorophyll fluorescence. Cut flowers were held under different light intensities 10 (L10) or 50 (L50) μmol‧m-2‧s-1 with or without treatment with external sucrose. We found substantial differences in stomatal conductance, photosynthesis rate, photosystem II (PSII) quantum efficiencies, specific fluxes, and vase life of the cut flowers when exposed to different light intensities. Light intensity at 50 μmol‧m-2‧s-1 increased photosynthesis capacity, thus delaying petal senescence and extending the vase life of cut flowers. L50 flowers maintained a high photosynthetic rate by reducing heat dissipation (DI0/RC) and increasing electron transport (ET0/TR0 and ET0/ABS) in the electron transport chain of the photosynthesis apparatus. The application of external sucrose extended the vase life of cut flowers by improving water balance and sustaining turgor pressure in the petals of the cut flowers. The net rate of photosynthesis of the cut flowers was increased by higher light intensity; however, it was not affected by the application of external sucrose. Our results indicate that the application of external sucrose is necessary to improve the longevity of cut flowers when endogenous sucrose production by photosynthesis is insufficient under low light conditions during the postharvest period. In addition, our results revealed that most of the photosynthetic parameters were significantly correlated with the vase life of cut rose flowers. Moreover, the relation between the rate of photosynthesis and chlorophyll fluorescence parameters indicates that the rise from the basic dark-adapted fluorescence yield to the maximum (OJIP transient) method can be used as a tool for the evaluation and prediction of the photosynthesis rate in cut flowers.