한국어 학습자들의 학술적 글쓰기에 대한 인식 및 태도 연구

곽준화(Guo, JunHua) 한국사회언어학회 2018 사회언어학 Vol.26 No.3

Guo, JunHua. 2018. “A Study on Korean learners’ Awareness and Attitude about Academic Writing”. The Sociolinguistic Journal of Korea 26(3). 1~30. The purpose of this paper is to investigate the awareness and attitudes of Korean learners about Academic Writing and to identify the problems which should be solved in academic writing education for Korean learners. For this, 62 foreign students were conducted a questionnaire survey, and 18 of them were interviewed to elicit their attitudes, perceptions about academic writing. A result of analysis showed that students have a very negative attitude towards writing. Moreover, they are not aware of the importance of writing. Therefore, they are negligent of writing and do not actively participate in academic activities. Second, students know the connection between general purpose writing learning and academic writing learning, but they have no systematic understanding of Korean academic writing. They simply gain knowledge of writing by imitating. Third, although they showed a willingness to be good at academic writing, they lacked subjective initiative on writing learning. And their writing study was centered on TOPIK. In order to solve these problems, this paper suggested solutions from an ecological perspective: language knowledge entry, learning environment, and learner’s self - growth. First, it is needed to help foreign students to have a systematic knowledge of academic writing as soon as possible. Second, outside the classroom, students should be offered a variety of opportunities to participate in academic activities.third, it is necessary to study the internal motivation of interest which attracts students’ attention and allow them to have a positive attitude about academic writing.

Distributed Event-triggered Consensus Control for Heterogeneous Multiagent Systems under Fixed and Switching Topologies

Junhua Huang,Liding Chen,Xuhuan Xie,Mufeng Wang,Bugong Xu 제어·로봇·시스템학회 2019 International Journal of Control, Automation, and Vol.17 No.8

This paper investigates the distributed consensus problem for heterogeneous multi-agent systems via event-triggered scheme. To alleviate the communication burden, a distributed event-triggered consensus algorithm using an open-loo estimate and neighboring information is proposed. In the proposed event-triggered scheme, the control input of each agent is dependent on the estimate and information at discrete instants. Firstly, the novel event-triggered consensus algorithm is proposed for fixed topology, which involves the discrete communication between neighboring agents. Then, for the switching topology, the triggering condition is proposed by virtue of a topology-dependent dwell time approach. Further, the corresponding consensus procedures are given. Finally, the effectiveness of the proposed scheme is illustrated by numerical results.

Design of a See-Through Head-Mounted Display with a Freeform Surface

Junhua Wang,Min Xu,Yuechao Liang 한국광학회 2015 Current Optics and Photonics Vol.19 No.6

This paper described an off-axis head-mounted display system. It is composed of a 7-piece coaxial relaylens group and a freeform surface combiner. This configuration has a simple structure and a wide fieldof view (FOV). In this design, a freeform surface is chosen as the combiner, to simplify the structureand attain good image quality. We generated this freeform surface by considering both coordinates andnormals of discrete data points. Moreover, we realize a coaxial structure in the relay lens group, whichis compact and benefits from a loose tolerance requirement. The HMD system we finally realized hasa 40° × 30° FOV and 15-mm exit pupil diameter

Design of a See-through Off-Axis Head-Mounted-Display Optical System with an Ellipsoidal Surface

Junhua Wang,Qing Zhou,Jie Chen,Lexin Hou,Min Xu 한국광학회 2018 Current Optics and Photonics Vol.2 No.3

A new method to design a see-through off-axis head-mounted-display (OA-HMD) optical system with an ellipsoidal surface is proposed, in which a tilted ellipsoidal surface is used as the combiner, which yields the benefits of easier fabrication and testing compared to a freeform surface. Moreover, we realize a coaxial structure in the relay lens group, which is simple and has looser tolerance requirements, thus making assembly easier. The OA-HMD optical system we realize has a simple structure and consists of a combiner and 7 pieces of coaxial relay lenses. It has a 48° × 36° field of view (FOV) and 12-mm exit pupil diameter.

Design of a Low Distortion Head-Mounted Display with Freeform Reflective Mirror Based on Two Ellipsoids Structure

Junhua Wang,Yuechao Liang,Min Xu 한국광학회 2016 Current Optics and Photonics Vol.20 No.2

A new method to design a low distortion, even relative illumination, optical see-through head-mounteddisplay (HMD) with a freeform reflective mirror (FFRM) based on the two similar ellipsoids structureis proposed. The HMD we have realized has a simple structure which consists of two similar ellipsoidsurfaces, an FFRM, a 7-piece co-axis relay lens, and an OLED. This structure can be applied to offsetdistortion, reach even relative illumination, and correct the off-axis aberrations. The HMD we finally haverealized has a near 3% low distortion, a higher than 80% relative illumination, and a 40°×30° field ofview (FOV).

Effect of Micronutrient Supplementation on the Growth of Preschool Children in China

Junhua Han,Yuexin Yang,Xiaoping Shao,Mei He,Lihua Bian,Zhu Wang 한국영양학회 2002 Nutritional Sciences Vol.5 No.3

Building Cooling Load Prediction Based on Time Series Method and Neural Networks

Junhua Zhuang,Yimin Chen,Xiaoxia Shi,Dong Wei 보안공학연구지원센터 2015 International Journal of Grid and Distributed Comp Vol.8 No.4

Predicting the load in a building is essential for the optimal control of heating, ventilating and air-conditioning (HVAC) systems that use Ice Thermal Energy Storage (ITES) technology and also for cost and energy reduction of the non-storage systems. To solve the problems of the low accuracy of prediction by a single method, and most load predictions focusing on short-time prediction that cause reducing the practical significance, the application of the combined prediction method of time series and neural networks is presented in this paper. A case study shows that high accuracy is achieved by using the combined prediction model based on these two methods compared with the time series method in predicting the building load for longer time.

A Novel Electrochemical Method for Sensitive Detection of Melamine in Infant Formula and Milk using Ascorbic Acid as Recognition Element

Junhua Li,Daizhi Kuang,Yonglan Feng,Fuxing Zhang,Zhifeng Xu,Mengqin Liu 대한화학회 2012 Bulletin of the Korean Chemical Society Vol.33 No.8

A novel and convenient electrochemical method has been developed for sensitive determination of melamine (MEL) using ascorbic acid (AA) as the recognition element. The working electrode employed in this method was modified with the nanocomposite of hydroxyapatite/carbon nanotubes to enhance the current signal of recognition element. The interaction between MEL and AA was investigated by fourier transform infrared spectroscopy and cyclic voltammetry, and the experimental results indicated that hydrogen bonding was formed between MEL and AA. Because of the existing hydrogen bonding and electrostatic interaction, the anodic peak current of AA was decreased obviously while the non-electroactive MEL added in. It illustrated that the MEL acted as an inhibitor to the oxidation of AA and the decreasing signals can be used to detect MEL. Under the optimal conditions, the decrease in anodic peak current of AA was proportional to the MEL concentrations ranging from 10 to 350 nM, with a detection limit of 1.5 nM. Finally this newly-proposed method was successfully employed to detect MEL in infant formula and milk, and good recovery was achieved.

MicroRNA-217 Functions as a Tumour Suppressor Gene and Correlates with Cell Resistance to Cisplatin in Lung Cancer

Junhua Guo,Zhijun Feng,Zhi’ang Huang,Hongyan Wang,Wujie Lu 한국분자세포생물학회 2014 Molecules and cells Vol.37 No.9

MiR-217 can function as an oncogene or a tumour suppressor gene depending on cell type. However, the function of miR-217 in lung cancer remains unclear to date. This study aims to evaluate the function of miR-217 in lung cancer and investigate its effect on the sensitivity of lung cancer cells to cisplatin. The expression of miR-217 was detected in 100 patients by real-time PCR. The effects of miR-217 overexpression on the proliferation, apoptosis, migration and invasion of SPC-A-1 and A549 cells were investigated. The target gene of miR-217 was predicted by Targetscan online software, screened by dual luciferase reporter gene assay and demonstrated by Western blot. Finally, the effects of miR-217 up-regulation on the sensitivity of A549 cells to cisplatin were determined. The expression of miR-217 was significantly lower in lung cancer tissues than in noncancerous tissues (p < 0.001). The overexpression of miR-217 significantly inhibited the proliferation, migration and invasion as well as promoted the apoptosis of lung cancer cells by targeting KRAS. The up-regulation of miR-217 enhanced the sensitivity of SPC-A-1 and A549 cells to cisplatin. In conclusion, miR-217 suppresses tumour development in lung cancer by targeting KRAS and enhances cell sensitivity to cisplatin. Our results encourage researchers to use cisplatin in combination with miR-217 to treat lung cancer. This regime might lead to low-dose cisplatin application and cisplatin side-effect reduction.

Acoustic Power Measurement for a Cylindrical Concave Transducer by using the Self-Reciprocity Method

Junhua Li,Lili Yu 한국물리학회 2018 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.73 No.1

A novel solution of measuring the acoustic power for a convergent cylindrical wave is proposed based on the self-reciprocity method, which turns the acoustic-power measurement to an electrical-parameters measurement. The formula for estimating the acoustic power was derived for a cylindrical concave transducer. The diffraction and the reflection corrections were also investigated for the precise measurement of the acoustic power. The performance of this method was compared with that of the radiation force balance (RFB) method. The experimental results showed good agreement. Moreover, the self-reciprocity method is more robust to the environment than the traditional RFB method and in practice can be extended to low-level acoustic power measurements.