일부 치위생과 대학생들에서 자아탄력성과 우울증과의 관계 연구

장성연,김현경 대한치과위생학회 2015 대한치과위생학회지 Vol.17 No.1

This study was conducted to suggest the recognition of importance and the necessity of management by identifying the self elasticity elements which affect the depression of dental hygiene department students. Study subjects were targeting 600 female students who were enrolled in dental hygiene department in six three-year course universities and the survey was conducted from September 2012 to December 2012. 553 collected survey data were analyzed with SPSS 19.0 version program. 1. Significant differences in self elasticity according to general characteristics were identified in age, experience to study one more year, subjective family economy level, satisfaction about the department of major, satisfaction about the university. 2. Significant differences in depression according to the general characteristics were identified in subjective family economy level, satisfaction about the university and satisfaction about the department of major and significant differences in the subcategories of depression were identified in loneliness, helplessness and worthlessness. 3. Confidence, effectiveness in personal relations, optimistic attitudes which are the composing elements of self elasticity were identified to positively affect the depression and as the self elasticity was higher, the depression was lower. 4. As the self elasticity positively affects the depression, it is considered that the school should have the curriculum to raise the liberal arts knowledge and the development of personal counseling program and education which is required to prevent and mediate the depression.

Improvement of Charge Extraction in Colloidal Quantum Dot Solar Cells

장성연 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1

Colloidal Quantum Dot (CQD) have emerged as a promising photoactive material due to low production cost and solution processability. Recent advances in understanding the properties of CQDs and the operation issues improved the performance of CQD based photovoltaic devices (CQDPVs). In this work, room temperature solution-processed high-efficiency CQDPVs are developed by improving charge extraction properties at p-n heterojunctions. Two types of interfacial modification methods; 1) a conjugated polyelectrolyte, WPF-6-oxy-F, and 2) chemical modifier 1,2-ethanedithiol (EDT), were used for ZnO/PbS-CQD heterojunctions. All of the device parameters are improved as a result of the enhanced built-in potential and the reduced interfacial charge recombination at the heterojunction. Consequently, the power conversion efficiency of the CQDPVs reached to a certified power conversion efficiency (PCE) of 10.14% with decent air stability.

1P-338 Development of naringenin riboswitches through tailored evolutionary pathways

장성연,장성호,정규열 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.0

“단순하고 명확하게, 초심으로!”

장성연 한국생물공학회 2022 BT NEWS Vol.29 No.2

Estimation of Residential Electricity Demand in Korea Allowing for a Structural Break

장성연 한국계량경제학회 2020 계량경제학보 Vol.31 No.4

This study examines the time series characteristics of residential electricity demand and its determinants in Korea and the short-run and long-run relationship among them. We employ unit root tests, cointegration, and error-correction models on annual time series for the period 1972--2019. The rapid development of Korea over this period provides clear evidence of the possibility of structural breaks. We find that residential electricity demand and its determinants are trend-stationary processes with a slope change, which implies that there is no need to invoke cointegration methods under the unit root assumption. We expect that the essential modeling strategy presented in this article will be widely applicable.

일부 치위생과 신입생의 학과 선택 동기와 학과 SNS 이용 만족도에 관한 연구

장성연,오현경 한국치위생과학회 2022 대한치위생과학회지 Vol.5 No.2

Background: Due to the declining number of students preparing for university entrance exams , the quota of universities has been decreasing continuously. This situation became increasingly diverse as new media used online, mobile, and PR tools to continuously invite students. This study is aimed at offering the helpful data to plan an effective PR strategy by analyzing the correlation between the major selection and satisfaction of the department’s social media usage among freshmen majoring in dental hygiene. Methods: The collected data from the self-reported survey with freshmen were analyzed using the SPSS 22.0 program. The survey items were motive to select the major, social media platform that subjects used, reasons to use the media, time to visit the department’s social media platform, and satisfaction level on the department’s social media platform, using a 5-point Likert Scale. Results: The reasons for choosing a major were given by 32.2% and 15.9% respondents, respectively, as the vision after graduation and practice facilities. 39.9% and 31.4% used Instagram and YouTube for social media platforms, respectively, for using social media platform; 26.9% and 26.3% visited the department’s social media before and after entering the university, respectively; 46.4% and 24.9% used Instagram and YouTube for department social media; and they generally satisfied with the contents of the department’s social media. 40.9% of them said that information from the department’s social media was useful. 33.8% of them said the information from the department’s social media exceeded their expectations. 46.8% of them answered that the department’s social media made the department’s image positive. 33.4% got interested in the major more due to the department’s social media. According to 32.1% of respondents, the department’s social media was helpful in deciding on a major. With 35.4%, a positive correlation was discovered between the department’s practice facilities and satisfaction on the department’s social media. Conclusion: It is thought that the department’s social media should try continuously by uploading the contents to meet the users’needs on a regular basis and seeking the plans to be able to collect various opinions using surveys through the related social media so that students can select the major and, moreover, lead the positive direction to adapt the university life under the unfamiliar environment after admission.

Systematic evolution of ligands by exponential enrichment (SELEX) for RNA aptamer that particularly binds to ε-caprolactam

장성연,정규열 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0

ε-Caprolactam is a monomer of Nylon 6 used for fiber and plastic, and the global ε-caprolactam market is estimated to $US 10.6 billion per year. RNA aptamer is applicable for diverse fields such as therapeutic agent, research reagent, and diagnosis. Because RNA aptamer that specifically binds to ε-caprolactam has not been discovered or developed, we performed systematic evolution of ligands by exponential enrichment (SELEX) that consists of repeated series of processes in order to obtain synthetic RNA aptamer for caprolactam. We carried out several rounds of SELEX and obtained a pool of RNA aptamer and the enriched aptamer pool can be applied in various areas of biotechnology where in vitro or in vivo detection of ε-caprolactam is needed.

지속가능한 공간 디자인 기획 활용 모델 제안 - 공간의 가치 생성 요소와 작용을 중심으로 -

장성연 한국브랜드디자인학회 2016 브랜드디자인학연구 Vol.14 No.3

현재 대부분의 디자인 기획은 현 시대 요구되는 제품 또는 공간의 기능과 미적 가치를 현재적 시점으로 담아낸다. 하지만 디자인의 실제적 가치 생성은 수용자로부터 받아들여진 후부터 발생되며, 특히 공간은 비가역성과 고착성으로 인하여 오랜 시간에 걸쳐 가치가 변화된다. 따라서 본 연구는 시간의 흐름에 따라 작용하는 공간 영향 요소들의 시각화 모델을 구축, 지속적 가치를 고려한 공간 디자인 기획에 활용 가능하게 하는 것을 목적으로 한다. 현재 대부분의 공간디자인 기획에서의 특성과 한계를 파악하고 공간의 가치를 형성하는 요소들의 작용을 추출, 시간의 흐름을 포함한 단계별 공간가치 생성 요소와 작용에 대한 시각화 된 모델을 개발하였다. 또한, 개발된 모델을 통하여 지속가능한 기획이 필요한 동대문 디자인 플라자를 분석하여 모델의 활용 가능성을 증명하였다. 시간의 흐름에 따라 나타나는 공간의 현상과 가치들을 예측하여 공간 기획 시 적용 할 수 있는 기반 조사 및 분석 가능한 틀을 제시하였다. 공간을 기획할 시 활용 가능한 시간의 단계별 공간의 가치 발생 요소와 작용을 가시적으로 보일 수 있도록 시각적 활용의 방법을 제시했다는 것에 연구의 의의가 있다. Most design planning made at present embody the arrangements, functions, and aesthetic values of the spaces required in this era from the contemporary perspective. However, the success of design begins not from the time of completion, but from the moment when it is accepted by the recipients. In particular, the value of space is changed over time due to the irreversibility. The purpose of this study is to build a visualization model for the action of space influencing factors that operate over time and enable it to be used for space design planning considering sustainable value. A step-by-step visualization model was developed for the space value creation factors and operations including the flow of time by drawing the operations of factors that create the value of space while identifying the characteristics and limitations in the space design planning stage. Furthermore, the potential for utilization of the model was demonstrated by analyzing the DDP which requires sustainable planning as an urban landmark through the developed model. The main role of this model is to predict the phenomena and values of space that appear over time and to perform basic investigation and analysis that can be applied to planning. The significance of this model lies in the presentation of a visual utilization method to predict the actions of phased factors according to the purpose of the space and to clearly visualize the values generated as a result of it.

Electrical Properties of Organic Single Molecules

장성연 한국공업화학회 2007 한국공업화학회 연구논문 초록집 Vol.2007 No.1

일부 치위생과 학생들의 임상실습 시 교과목 효용에 관한 연구

장성연,Jang, Sung-Yeon 대한치과위생학회한국치위생과학회 2021 대한치위생과학회지 Vol.4 No.1

Background: The present study aimed to analyze which curriculum is the most relevant to dental hygiene students when they participate in clinical practice in order to provide a useful reference for preparing educational guidance in this field. Method: The survey utilized in the present study consisted of six questions about general characteristics, such as grade, satisfaction with major, amount of clinical practice, period of clinical practice, place of clinical practice, and the most interesting are during clinical practice. When evaluating curriculum relevancy, the following were ranked on a 5-point Likert scale, where 5 = very useful, 4 = comparatively useful, 3 = normal, 2 = comparatively unuseful, 1 = very unuseful: difference in requirements in the field of clinical practice, reason for this difference, and question about the utility of each curriculum. On this scale, higher points implied higher relevance. Result: The highest groups of curricula regarding curriculum utility were as follows: operative dentistry (59.6%), pre-clinical practice (55.2%), dental materials and clinical practice (54.4%), and prosthetic dentistry (49.6%). The lowest groups of curricula regarding curriculum utility were as follows: oral physiology (2.0%), oral histology and embryology (1.6%), and oral microbiology (1.2%). These results imply a lack of connection between the curriculum and tasks in clinical practice. Conclusion: Based on the results of the present study, it appears that both theory and practice courses of the clinical curriculum must be conducted systematically, and that there is a need to conduct education for the fundamental curricula, such as oral physiology, oral histology and embryology, and oral microbiology, regarding the relevance of tasks practiced in clinics.