청소년의 스마트폰 중독과 우울 및 불안과의 관계

김경은,김필송,민주연,박수경,신서인,이지은,정해인,조호정,최정원,최정인 이화여자대학교 간호과학대학 2013 이화간호학회지 Vol.- No.47

Purpose: The purpose of this study was to investigate the relationships between the degree of smart phone addiction among adolescents and their depression and anxiety levels. Method: In this study, 379 high school students were selected using the convenient sampling method. The instruments used for this study were smart phone addiction measure, the CES-D (Center for Epidemiological Studies-Depression Scale), and the STAI (State-Trait Anxiety Inventory). Data were analyzed using the SPSS 20.0 program with descriptive statistics, t-test, ANOVA with Scheffe test, and Pearson’s correlation coefficient. Result: The mean score for smart phone addiction was 40.45±17.27, depression was 36.56±9.58, state anxiety was 44.00±9.61, and trait anxiety was 45.70±9.75. There were significant differences between the degree of smart phone addiction and the following variables: gender (t=-4.953, p<.001), hours of smart phone use per day (F=12.259, p<.001), types of frequently used features (F=3.485, p=.008), and satisfaction level for smart phone (F=5.18, p<.001). There were statistically significant relationships (p<.001) among degree of smart phone addiction, depression level, and state and trait anxiety levels. Conclusion: The results of this study suggested that there was a significant relationship between smart phone addiction and mental health, specifically, depression and anxiety among adolescents. Further research is needed to develop nursing strategies to provide care for adolescents who frequently utilize smart phones.

지방산 유지 원료에 따른 고형비누의 특성에 관한 연구

정명선,배한수,이봉연,민경혜,류덕환 계명대학교 생활과학연구소 2001 科學論集 Vol.27 No.-

The experimental results on the washing efficiency of detergent made from corn oil, wasted cooking oil and pig fat oil are as follows ; Laundry factors in this experiment are detergent concentration, laundry temperature and laundry time. 1.The surface tension of each detergent showed the lowest in 0.2% concentration corn oil 60.84, wasted cooking oil 61.11, pig fat oil 60.73dyne/cm. 2.The wasthing efficiency based on different concentration of detergents showed the highest in 0.2% concentration. 3.The highest washing efficiency appeared in 0.2% concentration 40℃ temperature and 40~50 min. time. There showed no difference in the washing efficiency according to the volume of water. It can be said that the frictional force of bearing rather than the volume of water worked on the efficiency.

상악 정중 과잉치의 위치와 병발증간의 관계

정연화,나경수,조봉혜 대한구강악안면방사선학회 2008 Imaging Science in Dentistry Vol.38 No.2

Purpose : The purpose of this study was to evaluate the relationship between the position of mesiodens and its complications. Materials and Methods: The subjects for this study consisted of 172 patients with mesiodens. Panoramic radiographs and cross-sectional tomography were taken of all of the subjects. Their clinical records and radiographs were analyzed in order to study the direction and vertical and sagittal position of mesiodens, as well as complications caused by mesiodens. Results : The number of mesiodens was one in 112 cases (65.1%) and two in 60 cases (34.9%). Complications were found in 121 mesiodentes (52.2%), with being median diastema the most frequent. The incidence of complications was high in erupted mesiodens (75.0%), in horizontal mesiodens (89.8%) and in mesiodens located within the arch (75.7%), but was low in mesiodens impacted above apex (29.8%), in normal position (34.4%) and in palatally positioned mesiodens (46.5%). Conclusion : It was suggested that the frequency of complications was different according to the vertical position, the direction of the crown and the sagittal position.

디젤엔진排出에서 나노PM 粒子計測用 凝縮核개수기(CPC) 特性에 關한 比較解析

鄭珉元,崔源鶴,柳鍾植,李海喆,車京玉 明知大學校 産業技術硏究所 2008 産業技術硏究所論文集 Vol.27 No.-

Recently, the nano-PM 's number concentration emitted by diesel internal combustion engine has focused on attention because this particulate matters are suspected being hazardous of human health. In this study, the particulate matters (PM) emissions of these vehicles were investigated by number concentration. A condensation particle counter (CPC) system was applied to measure the particle number and size concentration of diesel exhaust particles at the end of dilution tunnel along the NEDC(ECE15+EUDC) vehicle test mode using TSI 3010D and HCT 4312 CPC. As the research result, the characteristic of CPC comparison diesel nano-particle number and size distribution was investigated in this study.

SrTiO₃첨가에 따른 (x)BaTiO₃-(1-x)SrTiO₃의 유전적, 전기적 특성

정해덕,장동환,김덕근,홍경진,최창주 木浦大學校 工業技術硏究所 1998 工業技術硏究誌 Vol.8 No.-

In this paper, a ferroelectric material BaTiO3 was added to SrTiO3, then (x)BaTiO3-(1-x)SrTiO3(0.7≤x≤1) ceramics were fabricated with stable electrical properties in high voltage. Microstructures and electrical properties were investigated according to mixing conditions of addition material SrTiO3. As a result of the investigation of all experiments, the shrinkage was excellent in 0.9BaTioO3-0.1SrTiO3. The grain size was increased, the curie temperature was shifted low temperature. The 0.9BaTiO3-0.1SrTiO3 was appeared stable property in temperature vs. permittivity. Also, 0.9BaTiO3-0.1SrTiO3 was showed stable dielectric properties at 25~85[C]. V-I properties of specimen were observed in the temperature range of 21~143[C], were divided into three regions. the region I below 10[kV/cm] was shown Ohmic conduction, the region II from 10 to 30[kV/cm] was explained by the poole-Frenkel emission theory and the region III above 30[kV/cm] was analysed by the tunneling effect.

Periapical multilocular osteoporotic bone marrow defect

Jung, Yun-Hoa,Cho, Bong-Hae,Nah, Kyung-Soo 대한구강악안면방사선학회 2005 Imaging Science in Dentistry Vol.35 No.4

A case of osteoporotic bone marrow defect, which appeared as a well-defined multilocular radiolucency overlapping the roots of mandibular right second molar, was reported. On periapical radiograph, a daughter cyst-like radiolucency was seen at the anterior margin of the lesion making it difficult to rule out odontogenic keratocyst.

흰쥐 발생과정에서 새로운 Clathrin Assembly Protein 유전자의 발현에 관한 연구

정혜선,조경혜,김형래,김현 서울여자대학교 자연과학연구소 1997 자연과학연구논문집 Vol.9 No.-

Clathrin has been known to be involved in the formation of vesicle coat in trans Golgi network (TGN) and plasma membrane. AP 180, a clathrin assembly protein, has been reported to have an important role in promoting the polymerization of clathrin into a clathrin coated vesicle in neurons. We had a novel clathrin assembly protein (NCAP) gene that had a high degree of homology (95% amino acid sequence similarity, 86% identity) with AP 180 protein when translated into amino acids. To study the expression pattern of NCAP mRNA during the period of synaptogenesis, in situ hybridization histochemistry was carried out. Like AP 180, NCAP mRNA was highly expressed in the brain between the 1st week and third week after birth which represents the period of synaptogenesis in rat nervous system. However the results also showed that NCAP mRNA was expressed in other tissues. In the lung, the high level of expression was shown from the late embryonic stage till adult. The expression in the kidney was shifted from cortical areas to medulla through the development. And the strong expression in the liver was found at embryonic stage but specific expression was not observed after birth. From these results, NCAP is suggested to be a new clathrin assembly protein that promotes polymerization of clathrin into a clathrin coated vesicle in various tissues.

Cone Beam형 전산화단층영상을 이용한 상악대구치 발치 후 상악동 함기화 평가

정연화,나경수,조봉혜 대한구강악안면방사선학회 2009 Imaging Science in Dentistry Vol.39 No.3

Purpose : The purpose of this study was to examine the inferior expansion of the maxillary sinus floor following maxillary molar extraction. Materials and Methods : Cone beam computed tomographic images of 59 subjects were used to evaluate the height difference of the maxillary sinus floor between extraction sites and contralateral dentate sites. The height of the maxillary sinus floor was defined as the vertical distance to the Frankfort plane from the level of the anterior nasal spine to the most inferior point of the sinus floor. We examined the difference in sinus pneumatization according to the number of missing teeth and the vertical relationship of the molar roots to the sinus floor. Results : The inferior expansion of the maxillary sinus floor was 1.20±1.86 mm on the maxillary first molar and 1.90±2.42 mm on the maxillary second molar. Increased expansion was observed in cases where two proximate molars were extracted. There was no significant difference in sinus pneumatization following extraction according to the vertical relationship of the molar roots to the sinus floor. Conclusion : The results of this study confirm that sinus pneumatization occurs following maxillary molar extraction. In situations where pneumatization can affect treatment after molar extraction, three-dimensional radiography should be considered. (Korean J Oral Maxillofac Radiol 2009; 39 : 109-13)

디젤 乘用車輛에서 DPF 條件에 따른 極微細粒子의 排出 特性에 關한 硏究

鄭珉元,崔源鶴,柳鍾植,李海喆,車京玉 明知大學校 産業技術硏究所 2008 産業技術硏究所論文集 Vol.27 No.-

Recent1y, the nano-PM(Particulate Matters) number concentration emitted by diesel internal combustion engine has focused on attention because this nano-PM is suspected being hazardous of human health. In this study, the PM of the diesel passenger vehicles were investigated by number concentration. A condensation particle counter (CPC) system was used to measure the particle number concentration and size of diesel exhaust particles at the end of dilution tunnel during the NEDC(ECE15+EUDC) vehicle test mode using light-duty diesel passenger vehicles with DPFs. As a research result, the characteristic of DPF performance about diesel nano-particle number concentration and size distribution was investigated in this study.

파노라마 방사선사진과 cone beam CT에서 하악 제3대구치와 하악관의 관계 평가

정연화,나경수,조봉혜 대한구강악안면방사선학회 2008 Imaging Science in Dentistry Vol.38 No.3

Purpose : The purpose of this study is to evaluate the position of the mandibular canal in relation to the mandibular third molar by cone beam CT in cases showing a close relationship between the third molar and the mandibular canal on the panoramic radiograph. Materials and Methods : The panoramic images and cone beam CT scans of 87 impacted mandibular third molars in 60 patients were evaluated to assess the tooth relationship to the mandibular canal. The clearness of the canal wall and the vertical depth of the lower third molar were evaluated on panoramic radiographs. The lower third molars were assessed using cone beam CT to determine the proximity and position of the canal relative to the roots. Results : In the 66 cases where the canal wall was unclear on the panoramic radiographs, 58 (87.9%) of the third molars had contact between the canal and root; 34 (51.5%) canals were showed an inferior position and 22 (33.3%) showed a linguoinferior position on cone beam CT. Conclusion : Interruption of the canal wall on panoramic radiographs was highly predictive of contact between the mandibular canal and the third molar. Cross sectional CT may be indicated for localization of the mandibular canal in such cases.