• 한국정보통신학회논문지
• /
• 제24권1호
• /
• pp.91-99
• /
• 2020

영상 감지 시스템의 기반 기술인 그림자 제거기술의 경우 실시간 영상처리는 계산의 복잡도가 높아 처리속도가 저하되고, 명도 차이만으로 그림자를 제거하기 때문에 조명이나 빛에 민감하다는 문제점이 있다. 따라서 본 논문에서는 기존 시스템의 문제점을 해결하기 위해 가중치 적용 부분을 제거하여 계산의 복잡도를 낮추어 실시간성을 향상시켰다. 또한 수직 히스토그램을 이용해 그림자 인식률을 향상시킬 수 있는 그림자 제거 알고리즘 기반의 영상 감지 시스템을 설계 및 평가하였다. 평가 결과 기존 영상 감지 시스템에 비해 평균 속도가 약 5.6ms, 검출률이 약 5.5%p 향상된 것을 확인하였다.

• 수면정신생리
• /
• 제17권2호
• /
• pp.100-108
• /
• 2010

목 적: 컴퓨터의 보급으로 인터넷 사용이 보편화되면서 인터넷 중독에 대한 관심이 증가하고 있다. 그러나 인터넷 중독의 정확한 병태생리에 대한 이해와 진단 기준은 아직 확립되어 있지 않다. 청소년은 발달 과정 중에 있기 때문에 인터넷 중독에 더 취약할 가능성이 있으며, 우울감과 수면 문제에 대한 이해가 중요하다. 본 연구에서는 청소년의 인터넷 중독, 수면 양상, 그리고 우울감의 특징과 그 연관성을 살펴보고자 하였다. 방 법:서울 시내 일 중, 고등학교의 중학교 2학년(155명), 고등학교 1, 2학년 학생(644명)을 대상으로 하였고 그 중 696명의 설문지를 분석 대상으로 하였다. 설문지에는 Young 인터넷 중독 척도(Young's Internet Addiction Scale, YI-AS), 피츠버그 수면의 질 척도(Pittsburgh Sleep Quality In-dex, PSQI), 우울감 척도(The Center for Epidemiologic Studies Depression Scale, CES-D), 그리고 인터넷 사용 패턴과 기본적인 인구학적 정보에 대한 질문들이 포함되었다. 연구 대상자들을 학년별, YIAS 점수에 따라 나누어 비교하였고, YIAS와 다른 변인과의 상관관계를 분석하였다(two-tailed, p<0.05). 결 과: 인터넷 중독군(internet-addicted, IA)은 14명(2.0%), 과사용군(over-using, ou)은 193명(27.7%), 비중독군(not-addicted, NA)군은 489명(70.3%) 이었으며, 전체 대상군의 평균 IAS 점수는 35.24점, PSQI 점수는 5.53점, CES-D 점수는 16.72점이었다. 평일 평균적인 수면 시간은 학년이 올라가면서 점점 감소하였다(F=51.909, p< 0.001). IA군, OU군, NA군으로 나누어 비교하였을 때 컴퓨터를 공부 이외의 목적으로 사용하는 시간(96.36${\pm}$63.31분 vs. 134.92${\pm}$86.79분 vs. 213.57${\pm}$136.87분, F=34.287, p<0.001), 휴대용 전자기기를 공부 이외의 목적으로 사용하는 시간(84.22${\pm}$79.11분 vs. 96.97${\pm}$91.89분 vs. 152.31${\pm}$93.64분, F=5.400, p=0.005)에 유의한 차이가 있었다. PSQI 총점(5.26${\pm}$2.97 vs. 6.08${\pm}$2.97 vs. 7.50${\pm}$4.41, F= 8.218, p<0.001)과 CES-D 점수(15.40${\pm}$8.08 vs. 19.05${\pm}$8.42 vs. 30.43${\pm}$13.69, F=32.692, p<0.001)에서도 유의한 차이가 있었다. YIAS 점수는 컴퓨터를 공부 이외의 목적으로 사용하는 시간(r=0.356, p${\pm}$0.001), 휴대용 전자기기를 공부 이외의 목적으로 사용하는 시간(r=0.136, p<0.001)과 유의한 상관관계가 있었다. YIAS 점수와 PSQI 점수(r= 0.131, p=0.001), YIAS 점수와 CES-D 점수(r=0.265, p< 0.001), PSQI 점수와 CES-D 점수(r=0.357, p<0.001)는 서로 유의한 상관관계가 있었다. 결 론: 인터넷 중독은 행위 중독의 한 가지로 여러 정신병리와 관련이 있을 뿐만 아니라, 수면의 질을 결정하는 여러 가지 요인들, 우울감과도 밀접한 관련이 있다는 것을 알 수 있었다. 따라서 청소년의 인터넷 중독을 평가할 때 동반될 우울감과 수면 양상에 대한 고려가 함께 이루어지는 통합적인 접근이 필요할 것이다.

• Journal of Electrical Engineering and Technology
• /
• 제10권4호
• /
• pp.1746-1751
• /
• 2015

In this study low voltage Plasma Electrolytic Oxidation (PEO) was utilized to eliminate high voltage PEO drawbacks such as high cost, dimensional deformation and porosity. Low voltage PEO produces a thin coating which causes low corrosion resistance. In order to solve such problem, 0.1~0.6M pyrophosphates were added in a bath containing 1.4M NaOH, and 0.35M Na₂SiO₃. 70 V PEO was conducted at 25℃ for 3 minutes. Chemical composition, morphology and corrosion resistance of the anodized coating were analyzed. The anodized film was composed of MgO, Mg₂SiO₄, and Mg₂O₇P₂. The morphology of film showed appropriately dense structure and low porosity in the anodized layers. It is found that low voltage Plasma Electrolytic Oxidation in cooperation with phosphating treatment can provide a good corrosion protection for the AZ31B magnesium alloy.

• Structural Engineering and Mechanics
• /
• 제89권2호
• /
• pp.213-223
• /
• 2024

This paper proposes a composite design of fuzzy adaptive control scheme based on TMD RC structural system and the gain of two-dimensional fuzzy control is controlled by parameters. Monitoring and learning in LMI then produces performance indicators with a weighting matrix as a function of cost. It allows to control the trade-off between the two efficiencies by adjusting the appropriate weighting matrix. The two-dimensional Boost control model is equivalent to the LMI-constrained multi-objective optimization problem under dual performance criteria. By using the proposed intelligent control model, the fuzzy nonlinear criterion is satisfied. Therefore, the data connection can be further extended. Evaluation of controller performance the proposed controller is compared with other control techniques. This ensures good performance of the control routines used for position and trajectory control in the presence of model uncertainties and external influences. Quantitative verification of the effectiveness of monitoring and control. The purpose of this article is to ensure access to adequate, safe and affordable housing and basic services. Therefore, it is assumed that this goal will be achieved in the near future through the continuous development of artificial intelligence and control theory.

• 대한지역사회영양학회지
• /
• 제9권4호
• /
• pp.491-500
• /
• 2004

To assess the quality of nutrient intake by area of Korean adults, a dietary survey with the 3-day record method was obtained from 324 subjects aged 40 years and older but younger than 70 (52.4 $\pm$ 8.7) living in a rural area (Ansung) and suburban area of a middle-sized city (Ansan). The quality of nutrient intake was assessed by analyzing Nutrient Adequacy Ratio (NAR), Mean Adequacy Ratio (MAR) and Index of Nutritional Quality (INQ). The average daily mean energy intakes were 1,832 ㎉ for Ansung and 1,842 ㎉ for Ansan, respectively. Daily intakes of fat for Ansung and Ansan subjects were 40.9 and 40.3 g, and those for protein were 75.1 and 73.1 g, respectively. The overall calorie: protein: fat ratio (CPF) of energy intake was 63 : 17 : 20. Daily mean intakes of protein, fat, calcium, phosphorus, iron, potassium, carotene, sodium, thiamin, and niacin were significantly higher in Ansung residents than in Ansan subjects (p < .05). The average intakes of energy, calcium, vitamin A were lower than Recommend Dietary Allowance (RDA) in both areas. Note, over 30% of the study subjects had less than 75% of RDA of calcium, vitamin A and riboflavin. The MAR was higher in Ansung than Ansan residents (0.86 and 0.85, respectively; p < .05). INQs were over 1 for most nutrients except calcium (0.87), and that of calcium and phosphorus was each significantly higher in Ansung than Ansan subjects. Based on these results, nutrient intake quality of subjects aged 40 to 69 years living in the surveyed rural area is comparable to that of semi-industrialized suburban area in Korea. Dietary deficiency in all of calcium, vitamin A, and riboflavin, however, was a common problem for both rural and suburban residents.

• 한국운동역학회지
• /
• 제16권3호
• /
• pp.165-172
• /
• 2006

The purpose of this study was to determine effects of 12-week wearing of unstable shoe on the standing posture and gait mechanics. Nine healthy men were asked to wear the unstable shoes for 12-week and walk for 30 minute everyday. Their standing posture and gait mechanics were measured before and after treatment. Standing posture was measured for each side(anterior, posterior, lateral) for standing position. And gait analysis was measured joint angle of a right lower limb between first right heel contact and second right heel contact. Kinematic data were collected using video camera at 30 frame per seconds. Statistical analysis was paired t-test(p<.05) to compare before training with after that. A head tilt angle was significantly decreased for posterior side(p<.05). The angle of between center of line and surface was significantly decreased at midstance and take off during walking(p<.05). Ankle dorsiflexion significantly increased at heel contact2(p<.05) and ankle plantarflexion significantly increased at midstance and midswing(p<.05). The increase of ankle dorsiflexion showed that our results consisted with previous study. In conclusion, there was not large significant difference in static standing posture but joint angle of lower limb represented many changes with increasing of ankle motion during walking. These were of benefit to body by increasing leg muscle activity but it was necessary for man having a ankle problem to consider. Further studies concerning optimum outsole angle of unstable shoes are necessary.

• 대한치과보철학회지
• /
• 제44권4호
• /
• pp.383-393
• /
• 2006

Statement of problem : Limited research on flowable resin has been undertaken on its application directly on dentin associated with the adhesive systems. Purpose : This study was to evaluate the shear bond strengh and fracture aspect of flowable resin on human dentin with various types of dentin bonding adhesives with thermo cycling effect. Materials and methods: Filtek-Flow(3M ESPE, USA) was used as flowable resin and Eighty human molars were randomly divided into 4 groups : three dentin bonding adhesives (Scotchbond-Multipurpose : 3-step contentional system, One-Step : One-bottle system. Prompt L-Pop : All-in-one, self-etching primer) and 32% etching treatment without bonding adhesive as a control group. For evaluating their durability of bonding, each group was subdivided : storaging in the water at 37$^{\circ}C$(24 hours) and thermocycling (0$^{\circ}C$-55$^{\circ}C$, 30 seconds intervals, 1000 cycle). Shear bond strength tests were performed and resin-dentin interface and fracture mode were observed. Results were analysed by one-way ANOVA and Scheffe's multiple range test. Results and Conclusion : 1. At 0 cycle, the mean shear bond strength of One-Step exhibited the highest value of all groups(p<0.05), and there were no significant differences between Prompt L-Pop and Scotchbond-Multipurpose, Scotchbond-Multipurpose and control(p>0.05). After 1000 thermocycling, One-Step exhibited higher value than other groups(p<0.05), and there were no significant differences among other groups (p>0.05). 2. The shear bond strength of each group was significantly decreased after thermocycling except Scotchbond-Multipurpose (p>0.05). 3. The most common failure mode was adhesive type and mixed type, next in order.

• 대한치과보철학회지
• /
• 제41권2호
• /
• pp.169-181
• /
• 2003

Statement of problem : The survival rate of wide diameter implants was lower than of 3.75-mm implants in some clinical researches. Purpose : The purpose of this study was to investigate the influence of implant diameter on the osseointegration of implants in the rabbit femoral condyle and tibial metaphyses by means of removal torque measurements and histomorphometric analysis. Material and Method : Ten adult New Zealand White rabbits were used in this study Two 3.75-mm diameter implants were inserted through one cortical layer in the tibial metaphyses and one 3.75-mm diameter implant was inserted in the femoral condyle. 5.0-mm diameter implants were inserted in the other leg in the same manner. A total of 60 implants (3.75-mm diameter implants:30 : 5.0-mm diameter implants:30) were installed. After a healing time of 4 and 12 weeks, the peak removal torque values required to shear off the implants were recorded. From the removal torque values (Ncm) obtained, the mean shear stress ($N/mm^2$) was calculated. And the percentage of direct bone-to-implant contact and the percentage of bone area inside the thread were measured by Kappa Image Base-metreo. The Student's t-test was undertaken for statistical analysis (p<0.05). Results : The removal torque value of 5.0-mm diameter implants was higher than of 3.75-mm diameter implants (p<0.05). The difference of shear stress value between 3.75-mm and 5.0-mm diameter implants was not statistically significant (p>0.05). The percentage direct bone-to-implant contact had no statistical difference between two groups (p>0.05). The percentage of bone area inside the thread had no statistical difference between two groups (p>0.05). Conclusion It is concluded that the quality f osseointegration is not influenced by increasing implant diameter.

• Asian Pacific Journal of Cancer Prevention
• /
• 제15권16호
• /
• pp.6531-6534
• /
• 2014

Background: In Iran, breast cancer is the most prevalent cancer in women and a major public health problem. Methods: A cross sectional study was carried out to determine knowledge on breast cancer and breast self-examination (BSE) practices of 384 females living in the city of Hamadan, Iran. A purposive sampling method was adopted and data were collected via face-to-face interviews based on a validated questionnaire developed for this study. Results: Among respondents 268 (69.8%) were married and 144 (37.5%) of the respondents reported having a family history of breast cancer. One hundred respondents (26.0%) claimed they practiced BSE. Level of breast cancer knowledge was significantly associated with BSE practice (p=0.000). There was no association with demographic details (p<0.05). Conclusion: The findings showed that Iranian women's knowledge regarding breast cancer and the practice of BSE is inadequate. Targeted education should be implemented to improve early detection of breast cancer.

• Journal of Acupuncture & Meridian Studies
• /
• 제11권6호
• /
• pp.361-366
• /
• 2018

Anxiety is a common preoperative problem in cesarean section candidates. Nonpharmacologic anxiety control has been demonstrated to be more suitable in pregnant women. The current study was a randomized, single-blind clinical trial which evaluated the effect of acupressure on preoperative C-section anxiety. In this study, 60 patients facing surgery were randomly divided into two groups of 30 patients each. Those patients in the intervention group received simultaneous acupressure at the Yintang and HE-7 acupoints for 5 minutes before surgery, and patients in the control group received intervention at a sham acupoint. The anxiety level of patients was preoperatively assessed twice using the Spielberger's State-Trait Anxiety Inventory. The mean anxiety scores of the two groups were shown to be insignificantly different before the intervention (p = 0.859), whereas a significant difference between the mean anxiety scores of the two groups was observed after the intervention (p = 0.001), suggesting that acupressure reduced the anxiety of patients before surgery.