플랜트에서 가치공학 개념을 적용한 대관경 배관두께 선정에 관한 연구

최가영,유호선,문승재,Choi, Gayoung,Yoo, Hoseon,Moon, Seung-Jae 한국플랜트학회 2011 플랜트 저널 Vol.7 No.3

This research has suggested a method to select pipe wall thickness by application of the value engineering to reduce the cost and quantity that are major part of construction materials. This research shows that the application of value engineering reduces the cost of piping materials by optimizing pipe wall thickness while maintaining process flow date of design pressure and design temperature. Based on this knowledge, the application of the value engineering will lead to the cost reduction and quantity reduction by effective selection of pipe wall thickness. The application of the value engineering will help the EPC companies to win a contract in the overseas plant market.

산약 추출물의 항산화 및 항염증에 관한 실험적 연구

최가영,김병우,Choi, Ga-Young,Kim, Byoung-Woo 대한한방내과학회 2010 大韓韓方內科學會誌 Vol.31 No.2

Objectives : This study evaluated the effect of Dioscoreae Rhizoma on antioxidant and antimicrobial activity in vitro. Methods : In vitro experiments were made on antioxidant by DPPH radical scavenging activity, enzyme activity of SOD, protective effect about $H_2O_2$ and DNA fragmentation in RAW264.7 cells, as well as antimicrobial by Cox-2 expression in LPS-induced RAW264.7 cells. Results : 1. Dioscoreae Rhizoma's antioxidant ability was improved by DPPH radical scavenging activity. 2. Antioxidant ability of Dioscoreae Rhizoma produced good results at more than 0.025 mg/$m{\ell}$. 3. On protective effect of Dioscoreae Rhizoma about $H_2O_2$ on RAW264.7 cells, with addition of Dioscoreae Rhizoma extract the cells' survival increased compared to adding $H_2O_2$ only. 4. About revelation-control of Cox-2 at RAW264.7 cells which induce by LPS, when Dioscoreae Rhizoma's concentration was higher from 0.0125 mg/$m{\ell}$ to 1 mg/$m{\ell}$, its control activity was stronger. Thus we found Dioscoreae Rhizoma has antimicrobial activity. 5. The power of DNA fragmentation control of Dioscoreae Rhizoma was time-independent. Conclusions : From this study we conclude that Dioscoreae Rhizoma has effects on antioxidant and antimicrobial activity. However, considerable work still needs to be done studying antioxidants by concentration, as well as a variety of experiments about antimicrobial activity.

역류성 식도염의 변증과 처방에 관한 문헌적 고찰 - 중국 논문 중심으로 -

최가영,선승호,김병우,이선주,오현석,한인식,고재언,Choi, Ga-Young,Sun, Seung-Ho,Kim, Byoung-Woo,Lee, Sun-Ju,Oh, Hyun-Suk,Han, In-Sik,Ko, Jae-Eon 대한한방내과학회 2011 大韓韓方內科學會誌 Vol.32 No.1

Objectives : This study investigated oriental diagnosis and treatment of reflex esophagitis (RE) such as syndrome differentiation and herbal medicine by reviewing Chinese journals. Methods : A journal search was performed using China National Knowledge Infrastructure (CNKI) from January 2006 to December 2010. The keywords were the various combinations of 'reflex esophagitis', 'Chinese medicine', 'syndrome differentiation', and 'herbal medicine'. All types of journal entries that explained or referred to herbal medicines and definite syndrome differentiations were included. The Types of the journals were randomized clinical trials (RCT), reviews, essays, case series and reports. Vague syndrome differentiations and experimental studies were excluded. Selected journals were extracted and summarized by two researchers independently. Results : 47 Chinese entries were finally selected. 61% of them were case-control trials that had non-randomized, active controlled clinical trials. 36 kinds of syndrome differentiations about RE were investigated. We summarized and divided them into 10 syndrome differentiation groups. 肝胃不和(syndrome of liver qi invading the stomach) in syndrome differentiation, 和胃降逆 (harmonize the stomach and direct qi downward) in method of treatment, and Jwa kum-whan (左金丸) were cited with high frequency in RE. Conclusions : We find that many kinds of syndrome differentiation groups and herbal medicines for reflex esophagitis are used in China, compared with Korea. Further studies will be required about oriental syndrome differentiation and treatment of this disease.

위성기반 증발산량 및 토양수분량 산정 국내 연구동향

최가영,조영현,Choi, Ga-young,Cho, Younghyun 대한원격탐사학회 2022 大韓遠隔探査學會誌 Vol.38 No.6

The application of satellite imageries has increased in the field of hydrology and water resources in recent years. However, challenges have been encountered on obtaining accurate evapotranspiration and soil moisture. Therefore, present researches have emphasized the necessity to obtain estimations of satellite-based evapotranspiration and soil moisture with related development researches. In this study, we presented the research status in Korea by investigating the current trends and methodologies for evapotranspiration and soil moisture. As a result of examining the detailed methodologies, we have ascertained that, in general, evapotranspiration is estimated using Energy balance models, such as Surface Energy Balance Algorithm for Land (SEBAL) and Mapping Evapotranspiration with Internalized Calibration (METRIC). In addition, Penman-Monteith and Priestley-Taylor equations are also used to estimate evapotranspiration. In the case of soil moisture, in general, active (AMSR-E, AMSR2, MIRAS, and SMAP) and passive (ASCAT and SAR)sensors are used for estimation. In terms of statistics, deep learning, as well as linear regression equations and artificial neural networks, are used for estimating these parameters. There were a number of research cases in which various indices were calculated using satellite-based data and applied to the characterization of drought. In some cases, hydrological cycle factors of evapotranspiration and soil moisture were calculated based on the Land Surface Model (LSM). Through this process, by comparing, reviewing, and presenting major detailed methodologies, we intend to use these references in related research, and lay the foundation for the advancement of researches on the calculation of satellite-based hydrological cycle data in the future.

IPA를 활용한 자연휴양림 운영주체별 이용행태 및 관리방안 연구

최가영(Choi, Ga Young),김통일(Kim, Tongil),김재준(Kim, Jae Jun) 한국산림휴양복지학회 2016 한국산림휴양학회지 Vol.20 No.2

물가인상으로 인한 인건비 및 운영비 증가 등으로 인해 자연휴양림 운영에 있어 경영수지 불균형이 지속적으로 발생하고 있다. 특히 사립자연휴양림의 경우, 처음 조성당시 공익적 측면에서 국·공립 자연휴양림과의 보완성을 염두해두었던 것과 달리 막대한 초기투자와 경영난으로 인해 지속적인 관리에 어려움이 따르고 있는 실정이다. 본 연구에서는 국·공·사립 자연휴양림 이용객의 이용행태를 파악하고, 자연휴양림 속성에 대한 중요도-만족도 분석을 통해 운영주체별 특성화 및 차별화 방안을 모색하고자 하였다. 이를 위해 선행연구를 바탕으로 29개의 자연휴양림 구성요소를 도출하였으며, 경기도 내 자연휴양림 6개소(국·공·사립 각 2개소)를 방문한 이용객을 대상으로 설문조사를 수행하였다. IPA 매트릭스 작성결과 운영주체별로 중요하게 여기는 속성이 서로 다르게 나타났으며, 특히 노력집중화의 속성이 다르게 나타나 향후 수익성 및 경쟁력 강화에 있어 각 유형별 특성을 살린 전략이 시행되어야 함을 시사하였다. Profitability of recreation forest is getting worse due to high operating costs and burden of personnel expenses. Despite complementarity effects of increasing public interest between National/Provincial and Private recreation forest, Private one has financial difficulties that are high cost of the primary investment and insufficient management conversion. In this context, this study aimed to examine visitor behavior and to suggest practical implications of specialization and differentiation of 3 different recreation forest type using IPA analysis. Finally 29 attributes of recreation forest were selected through literature review, and on-site survey carried out in 6 recreation forest(2 of each ownership type) in Gyeonggi province. Results of IPA matrix showed that the attributes considered most important and high priority by visitors were different in 3 types. In conclusion, results of this study proposed that in order to satisfy the visitors, National, Provincial and Private recreation forest should take a different marketing approach from those of the general ones, and it will be helpful to improve profitability and competitiveness of recreation forest for the future.

온라인 초등영어 수업의 방향: 온라인 영어 수업에 관한 초등학습자들의 인식도 조사

최가영 ( Choi¸ Gayoung ),윤택남 ( Yoon¸ Tecnam ) 서울교육대학교 초등교육연구원 2020 한국초등교육 Vol.31 No.4

코로나로 인하여 학교에서는 본격적인 온라인 수업에 돌입하게 되었고, 이에 교육계에서는 많은 혼란을 겪게 되었다. 특히 상호작용 활동이 배제된 상황에서 영어 교과의 경우 그 특성상 교사와 학생들은 많은 어려움에 직면하게 되었다. 이에 본 연구에서는 온라인 영어 수업에 대한 초등학습자들의 인식을 파악함으로써 온라인 영어 수업의 실태와 개선점을 알아보고, 바람직한 온라인 영어 수업의 방안을 고찰해보고자 하였다. 이 연구에서는 강원도의 N초등학교에 재학 중인 초등학생 4~6학년 268명이 참여하였으며, 연구 도구로는 온라인 설문지가 사용되었다. 설문지는 온라인 수업 및 수업구성과 활동의 선호도, 온라인 영어 수업에 대한 만족도 및 난이도로 구성되었다. 결과는 자모비 통계 프로그램을 활용하여 양적으로 분석되었으며 연구 결과를 바탕으로 초등학습자들의 온라인 영어 수업에 대한 인식은 다음과 같이 요약할 수 있다. 첫째, 초등학습자들은 온라인 영어수업보다 대면 영어 수업을 훨씬 더 선호하는 것으로 나타났다. 둘째, 초등학습자들이 온라인 영어 수업에서 선호하는 수업 구성은 영어 교사가 자체 제작한 수업 영상이었으며, 활동은 게임 활동으로 수업이 진행되는 것이었다. 셋째, 온라인 영어 수업 자체에서는 수업 구성 측면에서 대체로 만족하였으나, 난이도 측면에서는 ‘대체로 쉬웠다.’고 답하면서 적절하지 않다고 답하였다. 넷째. 성별 및 학년에 따른 온라인 영어 수업 만족도 및 난이도 차이에서는 유의미한 차이가 보이지 않았던 것으로 나타났다. 이러한 결과는 온라인 영어 수업을 직접 수강하는 학습자의 관점을 반영하므로 미래의 감염병 상황에 대비하여 온라인 수업을 설계하는 데에 중요한 자료가 될 것으로 기대된다. 아울러 영어 교과에서는 비대면이라는 한계를 극복하여 수업 효과를 극대화하며 양질의 온라인 수업을 확보하기 위한 교육 당국 및 관계자들의 많은 노력이 뒷받침되어야 할 것이다. As COVID-19 made remote learning a new norm, every party involved has been going through trial and error in its implementation. To improve the situation calls for more scholarly research. The purpose of this study is to investigate primary students’ perceptions on online English education and thereby to identify better approaches to this new mode of English learning. As for the methodology, researchers surveyed 266 students between grades four and six in N elementary school located in Gangwon Province. The survey was conducted online and consisted of questions concerning satisfaction levels and difficulty levels in online English education, and preference between online and face-to-face learning. For the data analysis, the Jamovi statistical program was used to administer the frequency and descriptive analysis, Independent Samples t-test as well as One-Way ANOVA. The finding are as follows: First, the survey takers far preferred face-to-face English learning to the online counterpart. Second, between the video instructions given by their own English teachers and those from outside sources, primary students preferred the former; and their favorite class activity was playing games. Third, they were generally satisfied with online English learning as such but found it not difficult enough, not with difficulty levels. Forth, the personal variables of gender and grade did not make a significant difference in satisfaction and difficulty levels in online English education. It is expected that these findings, as representing the views of learners themselves, will serve as an important resource for coping with the infectious disease-caused challenges of the present and the future. The study could also clearly remind English teachers that they need to make every effort to give high-quality instructions even in the difficult reality of remote learning.

지속가능성의 바이오필릭 디자인을 활용한 브랜드 아이덴티티 - 호텔 사례를 중심으로 -

최가영(Choi, Kayeong),이현수(Lee, Hyunsoo) 한국실내디자인학회 2020 한국실내디자인학회 학술대회논문집 Vol.22 No.2

국가 R&D 특허성과의 기술융합 네트워크 분석

최가영 ( Choi Ga Yeong ),조남욱 ( Cho Nam Wook ) 한국경영공학회 2020 한국경영공학회지 Vol.25 No.4

Purpose The purpose of this study is to analyze the changes in the technology convergence network of national R&D patent performance and the differences in technology convergence research trends between independent R&D and collaborative R&D. Methods Co-occurrence networks have been established in which multiple International Patent Classification (IPC) codes appear per patent in 2014 and 2017. Then, network analysis methods and QAP (Quadratic Assignment Procedure) analysis methods have been used in this study. Results As a result, this study shows that the degree of linkage between technologies related to national R&D projects has increased over time. The main fields of technology convergence research have been changed to ICT fields such as digital and data (G06Q, G06F) and bio fields such as food (A23L) and cosmetics (A61Q). The Ministry of Agriculture, Food and Rural Affairs actively conducts convergence research by introducing new technologies such as ICT. The Ministry of Health and Welfare actively conducts convergence research in the field of bio-health. Conclusion This study showed the changes and characteristics of technology networks of convergence R&D and collaborative R&D. The results of this study are expected to be used as a guideline for decision making in the government's R&D policies.

노년기근로자의 퇴직현상에 관한 심층적 연구

최가영(Ga Young Choi),조임현(Im Hyun Cho),이의훈(Eue Hun Lee) 한국노년학회 2001 한국노년학 Vol.21 No.1

본 연구는 노년기근로자들의 퇴직현상 및 이와 관련된 직장생활을 사실적으로 밝혀내기 위하여 진행되었다. 선진국에 비해 정년연령이 낮은 우리나라의 경우, 최근에는 정년이 되기 전의 조기ㆍ강제퇴직이 시행되고 있다. 노년인구비율은 증가하고 있는데 반해, 기업내 노년기근로자의 수는 점차 감소하고 있다. 이들은 기업으로부터 조기퇴직을 강요받거나 수용해야 하는 입장에 처해 있다. 고령자라는 이유만으로 직장에서 소외되고, 바람직하지 않은 퇴직을 선택해야하는 것이다. 퇴직 전 직장에서의 바람직하지 않은 경험은 퇴직 후 적응에 부정적인 영향을 미칠 것이다. 이와 같은 내용을 다룬 선행연구는 거의 없는 형편이다. 따라서 구체적이며 심층적인 결과를 획득하기 위해 심층면접을 통한 질적연구방법을 사용하였다. 기업 및 공무원, 사립교원을 포함한 20명을 심층면접하였으며, 그 결과를 분석하였다. 분석결과 노년기근로자일수록 기업의 조기퇴직 압력을 높게 지각하고 있으며, 나이가 많다는 사실만으로 소외되고 있는 것으로 나타났다. 또한 퇴직에 대해 대체로 부정적인 견해를 나타냈으며, 가장 큰 원인인 생계문제 타계를 위해 재취업을 원하고 있는 것으로 나타났다. 따라서 기업내 적절한 노년기근로자의 경력관리와 교육훈련이 필요하다는 것을 알 수 있다. 또한 국가 및 기업 차원에서의 재취업 및 환경변화에 따른 적응훈련이 필수적이라고 할 수 있다. 본 연구결과에 대한 논의와 시사점을 제시하였으며, 향후 연구를 위한 연구과제를 제안하였다. The purpose of this study is to investigate retirement and related working life of Korean older workers. Average retirement age in Korea is much lower than other developed countries. Even worse, because of recent economic recession, early or forced retirement has been induced throughout almost all industries. While Korean population is aging, number of older workers has been declined. They are well trained and have a lot of work-related knowledge. But they are alienated and feel forced to retire only because they are older than others. This situation creates a lot of negative effects among older workers. This study has been done using qualitative method in order to find out deep-seated response of older workers on retirement, especially early or forced retirement. Personal in-depth study has been done on 20 workers and retirees. Results show that older workers perceive the pressure of retirement from a company and colleagues and they feel to be alienated from the work place only because they are older than others. They have a negative feeling toward retirement basically because they retire too early and have to make a living at least for the time being after retirement. They want new full-time or part-time job after retirement. In order to reduce their negative feeling toward retirement, career management and training programs for retirees are necessary. Future research in this area has been suggested.

비파잎 분말 첨가 증편의 항산화 활성 및 품질 특성

최가영(Ga Young Choi),김명현(Myung Hyun Kim),한영실(Young Sil Han) 한국식품영양과학회 2021 한국식품영양과학회지 Vol.50 No.10

본 연구에서는 비파잎을 기능성 소재로 활용 가능성을 알아보고 비파잎 분말을 이용한 기능성 식품으로 증편 개발을 위해 비파잎 분말을 각각 0%, 1.5%, 3%, 4.5%, 6%를 첨가한 증편을 제조하여 증편의 항산화 활성 및 품질 특성을 분석하였다. 비파잎 분말의 총 폴리페놀은 169.30 mg GAE/g이었으며, 이를 증편에 첨가한 경우 시료 첨가량에 비례하여 총 폴리페놀 함량이 증가했다. 비파잎 분말의 DPPH 및 ABTS 라디칼 소거 활성을 측정한 결과 IC50값은 각각 9.76 μg/g, 86.63 μg/g으로 나타났다. 또한, 제조된 증편의 DPPH 및 ABTS 라디칼 소거 활성도 첨가량에 따라 유의적으로 증가하는 결과를 나타내었다. 비파잎 분말을 첨가한 증편의 품질 평가로는 pH, 당도, 수분함량, 조직감, 주사전자 현미경(SEM) 관찰을 실시하였다. 증편의 pH 및 당도는 첨가량에 따라 증가하는 결과를 나타내었으며, 수분함량은 비파잎 분말 첨가량이 증가함에 따라 감소하였다. 증편의 색도는 비파잎 분말 첨가량이 증가할수록 L값은 낮아지고 a값과 b값은 증가하는 유의적인 차이를 보였다. 조직감 중 경도와 검성, 씹힘성은 감소하는 결과를 나타내었으며, 응집성과 탄력성은 증가하는 결과를 나타내었다. 증편의 주사전자현미경(SEM) 관찰에서는 비파잎 분말 첨가량에 따라 기공 크기가 커지고 불규칙적으로 변하는 결과를 관찰하였다. 증편의 특성 강도 검사에서는 비파잎 분말의 첨가량이 증가할수록 비파잎의 색과 향, 쓴맛이 증가하였고, 촉촉한 정도는 감소하는 결과를 얻었다. 기호도 검사에서는 전반적으로 비파잎 분말 4.5% 첨가군에서 가장 높게 평가되었고 다음으로 3% 첨가군이 높은 점수를 받았다. 이상의 결과를 종합해 볼 때 증편에 비파잎 분말을 첨가하는 것은 항산화능이 증가하여 증편의 가치를 높일 수 있고, 건강지향적인 측면을 고려한 증편 개발이 가능할 것으로 생각된다. 특히 비파잎 분말 4.5% 첨가 수준이 전반적인 기호도와 생리활성 측면에서 증편의 가치를 높일 수 있을 것으로 생각된다. This study examined the antioxidant activity and quality of Jeung-Pyun prepared with different concentrations of loquat leaf powder (0%, 1.5%, 3%, 4.5%, and 6% of total material). We estimated the antioxidant activity using the DPPH-ABTS assay, and by determining the total polyphenol and flavonoid content of loquat leaf powder. To evaluate the quality characteristics, we measured pH, sugar and moisture content, color, and texture, made observations under an scanning electron microscope (SEM), and then assessed sensory properties and conducted preference evaluations. When the loquat leaf powder content increased, we noticed a significant increase in the total polyphenol, flavonoid content, and scavenging activity of the Jeung-Pyun measured using DPPH-ABTS (P<0.05). Characteristics of quality such as pH, sugar content, a value, b value, cohesiveness and springiness of Jeung-Pyun showed a significant increase with the addition of loquat leaf powder (P<0.05), whereas pH, moisture content, L values, hardness, gumminess and chewiness showed a significant decrease (P<0.05). The observations under the SEM showed that as the proportion of loquat leaf powder increased, the pores collapsed and merged, whereas the size of the pores became larger, and the number of pores decreased. Sensory evaluations showed that the Jeung-Pyun containing 4.5% of loquat leaf powder had the highest rating in all the sensory tests. In summary, loquat leaf powder improved the antioxidant activity and quality characteristics of Jeung-Pyun, which could then be used to develop various food items.