하악 정중선의 편위와 하악골의 높이차가 저작근 활성에 미치는 영향

정대연,한경수,현태연,곽동곤,Jung, Dae-Yeon,Han, Kyung-Soo,Hyun, Tae-Yeon,Kwag, Dong-Kon 대한안면통증구강내과학회 2001 Journal of Oral Medicine and Pain Vol.26 No.1

This study was performed to investigate the effect of mandibular midline shift and difference of mandibular height between both sides on the electromyo- graphic(EMG) activity of the masticatory muscles on clenching or gum chewing movement. For this study, 105 patients with temporomandibular disorders(TMD) were selected and panoramic radiograph were taken. Amount and side of the midline shift and height of the mandible from antegonial notch to the top of the condylar head were measured on panoramic view. $BioEMG^{(R)}$ (Bioresearch Inc., Milwaukee, USA) was used for recording of EMG activity(${\mu}V$) of the anterior temporalis and the superficial masseter on clenching or gum chewing movement. EMG activity on clenching during 533msec period were measured for activity of the starting point and the one second-after activity as the early EMG and the maximum EMG, respectively. EMG activity on gum chewing movement were measured for activity of the first and the second chewing stroke. The data collected were analysed by SPSS windows program, and the results of this study were as follows : 1. Height of the mandible was 8.06cm on right side and 8.03cm on left side, and showed no difference by age, but significantly differed by sex with higher in male subjects. 2. Mean value of the midline shift was 0.1mm with range of 0~5mm on both sides. The amount and side of the midline shift did not related with height difference of the mandible and/or the EMG activity of the masticatory muscles on clenching. 3. Prevalence of higher right side and higher left side of the mandible were almost same, and the EMG activity of higher side was not higher than that of the other side. 4. In the subjects with height difference of more than 5mm between both sides of the mandible, the early EMG activity on clenching were differed for the anterior temporalis, but the maximum activity were differed for the superficial masseter. 5. In the subjects with height difference of more than 5mm between both sides of the mandible, EMG activity of the anterior temporalis of the gum chewing side was not higher than that of the other side when chewing on the side of lower height, but in the subjects with height difference of less than 5mm, the EMG activity was higher than that of the other side.

고등학생들의 학습자 변인에 따른 디지털 영어학습전략 사용 양상에 관한 연구

정대연(Jung, Dae-Yeon),배지영(Bae, Jiyoung) 팬코리아영어교육학회(구 영남영어교육학회) 2021 영어교육연구 Vol.33 No.1

The purpose of this study is to examine high school students digital English learning strategies and analyze the interrelations between their use of digital English learning strategies and individual learner variables such as gender, grade, exposure and experience of digital devices, and English learning experience. The participants of the current study were five hundred fifty-seven students selected from one public high school located in Chungnam area. A questionnaire was developed to investigate the use of digital English learning strategies based on Oxford’s (1990) SILL and Bae and Kim’s (2018a) instruments. Data collected from 557 participants were statistically analyzed, and the results are as follows. As a result of analyzing the differences in the use of digital English learning strategies in grade and gender among individual learners variables, in all strategy types, girls showed statistically higher use of strategies than boys at lower grades. Additionally, it is shown that the frequency of use of digital devices and the use of digital English learning strategies are not necessarily in direct proportion. Finally, all of the general English learning periods had a statistically significant effect on the use of digital English learning strategies of high school students. In general, it was found that learners with a longer period of English learning use digital English learning strategies more actively. The suggestions and implications for the further study are presented. (225 words)

높이 자동제어가 가능한 차량 장착형 지뢰탐지장치에 대한 연구

강신천,정호영,정대연,성기열,김도종,김지웅,Kang, Sin Cheon,Chung, Hoe Young,Jung, Dae Yon,Sung, Gi Yeul,Kim, Do Jong,Kim, Ji Woong 한국군사과학기술학회 2017 한국군사과학기술학회지 Vol.20 No.4

The vehicle-mounted mine detection system with large detection sensor modules can search wide areas with a fast detection speed. To mount the heavy mine detectors on a manned or unmanned vehicle, it is necessary to design the detector driving mechanism and control system based on the considerations driven from the characteristic analysis and the operation requirements of the detection system. Furthermore, while operating the mine detector mounted on a mobile vehicle, it is significant to keep the height from the ground to sensors within a certain distance in order to get a qualified detection performance. As the mine detection sensor, we used ground penetrating radar widely used to geotechnical exploration, mine detection and etc. In this paper, we introduce a driving mechanism through analyzing the characteristics of the vehicle-mounted mine detection system. We also suggest a method to automatically control the distance between the ground and GPR by utilizing the GPR output values, used to detect mines at the same time.

TRIP-16 화합물의 베타세포 당지질독성 해독 기전 분석

박선미(Sun mi Park),정대연(Dae youn Jeong),구진모(Jin mo Ku),황윤정(Yoon Jung Hwang),최성이(Sung E Choi),강엽(Yup Kang),정귀완(Kwi wan Jeong) 대한약학회 2016 약학회지 Vol.60 No.6

Gradual deterioration of pancreatic beta cells is a conundrum still to be resolved in the diabetes field. The toxicity manifested by high level of glucose and saturated fatty acid (SFA), which is collectively termed as glucolipotoxicity, has been accepted as a predominant factor of beta cell dysfunction or failure. In this study, we examined the effect of TRIP (Triazolo[ 3,4-a]phthalazine)-16, a compound derivatized from TRIP which had been identified in a high throughput screening to discover chemicals protecting INS-1 cells from glucolipotoxicity. We also investigated its mode of action to reduce glucolipotoxicity, especially regarding modulation of lipid metabolism. From a series of cell-based experiments, we observed that TRIP-16 reduced fatty acid-induced triglyceride (TG) accumulation, whereas it increased oxidation rate of glucose or palmitate. The compound also reduced reactive oxygen species generated by palmitate and upregulated expression levels of carnitine palmitoyltransferase-1a (CPT-1a), peroxisome proliferator-activated receptor gamma coactivator 1-alpha (PGC- 1α) and uncoupling protein 2 (UCP-2), implicating that it can facilitate mitochondrial energy metabolism to oxidize palmitate. In terms of beta cell functioning, TRIP-16 augmented glucose-stimulated insulin secretion (GSIS) per se. Taken together, our data strongly suggest that TRIP-16 can be a potential drug candidate for prevention of type 2 diabetes through beta cell protection.

다중 객체 인식을 위한 파티클 필터 기반 클러스터링 방법

류권무(Kwon-Moo Ryu),조현진(Hyeon Jin Jo),정대연(Dae Yon Jung),V. Raghul,E. Dinesh,주영훈(Young Hoon Joo) 대한전기학회 2020 대한전기학회 학술대회 논문집 Vol.2020 No.7

하악 정중선의 편위와 하악골의 높이차가 저작근 활성에 미치는 영향

정대연,한경수 원광대학교 치의학연구소 2001 圓光齒醫學 Vol.10 No.2

This study was performed to investigate the effect of mandibular midline shift and difference of mandibular height between both sides on the electromyo- graphic(EMG) activity of the masticatory muscles on clenching or gum chewing movement. For this study, 105 patients with temporomandibular disorders(TMD) were selected and panoramic radiograph were taken. Amount and side of the midline shift and height of the mandible from antegonial notch to the top of the condylar head were measured on panoramic view. BioEMG^ (Bioresearch Inc., Milwaukee, USA) was used for recording of EMG activity(㎶) of the anterior temporalis and the superficial masseter on clenching or gum chewing movement. EMG activity on clenching during 533msec period were measured for activity of the starting point and the one second-after activity as the early EMG and the maximum EMG, respectively. EMG activity on gum chewing movement were measured for activity of the first and the second chewing stroke. The data collected were analysed by SPSS windows program, and the results of this study were as follows : 1. Height of the mandible was 8.06㎝ on right side and 8.03㎝ on left side, and showed no difference by age, but significantly differed by sex with higher in male subjects. 2. Mean value of the midline shift was 0.1㎜ with range of 0∼5㎜ on both sides. The amount and side of the midline shift did not related with height difference of the mandible and/or the EMG activity of the masticatory muscles on clenching. 3. Prevalence of higher right side and higher left side of the mandible were almost same, and the EMG activity of higher side was not higher than that of the other side. 4. In the subjects with height difference of more than 5㎜ between both sides of the mandible, the early EMG activity on clenching were differed for the anterior temporalis, but the maximum activity were differed for the superficial masseter. 5. In the subjects with height difference of more than 5㎜ between both sides of the mandible, EMG activity of the anterior temporalis of the gum chewing side was not higher than that of the other side when chewing on the side of lower height, but in the subjects with height difference of less than 5mm, the EMG activity was higher than that of the other side.