• 한국치위생학회지
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• 제13권5호
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• pp.749-757
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• 2013

Objectives : The aim of the study is to investigate the relationship between salivary flow, palate recognition threshold, DMFT index and oral health influence point (OHIP-14) of the adults over 40 years old. Methods : Salivary flow and taste recognition threshold were measured in 220 adults over 40 years old from three dental clinics in Daegu from January 3 to February 4, 2012. A total of 208 questionnaires were analyzed. Results : The adults recognized the sour taste in low concentration level when the salivary flow was faster. DMFT index was low in those who recognized sweet and sour taste that affected OHIP-14. Conclusions : Tooth decaying food must be restricted because of its high acidity in the past despite the individuals' taste recognition threshold was neglected. Before the diet control, it is necessary to measure the taste threshold of the individuals. Training for improving salivary flow is very important to prevent dental caries and to preserve good taste.

• 대한임상전기생리학회지
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• 제4권1호
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• pp.85-93
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• 2006

The purpose of this study was to determine the effect of transcutaneous electrical nerve stimulation(TENS) and He-Ne laser at auricular point on delayed onset muscle soreness(DOMS). Twenty healthy adult males and females performed eccentric exercise of the elbow flexor. DOMS was induced in a standardised fashion in the nondominant elbow flexor of all subject by repeated eccentric exercise. Subject were assigned randomly to one of trees groups. Group 1 received TENS to the appropriate auricular point for biceps pain, Group 2 received laser to the appropriate auricular point for wrist pain, Group 3 received no treatment and served as controls. After exercise, treatments were applied at 24 hours and at 48 hours and at 72 hours after. Group 1 showed stastically significant increase(p<0.05) in pain threshold after treatment whereas the Group 2 and 3 did not. Group 1 showed a significant increase in pain threshold than Group 2. These results suggest that TENS has the capability to higher pain threshold but laser does not.

• Archives of Plastic Surgery
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• 제47권6호
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• pp.559-566
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• 2020

Background Infraorbital nerve dysfunction is commonly reported after zygomaticomaxillary complex fractures. We evaluated sensory changes in four designated areas (eyelid, nose, zygoma, and lip) innervated by the infraorbital nerve. This evaluation was conducted using the static two-point discrimination test and the vibration threshold test. We assessed the diagnostic significance of the blink reflex in patients with infraorbital nerve dysfunction. Methods This study included 18 patients, all of whom complained of some degree of infraorbital nerve dysfunction preoperatively. A visual analog scale, the infraorbital blink reflex, static two-point discrimination, and the vibration threshold were assessed preoperatively, at 1 month postoperatively (T1), and at a final follow-up that took place at least 4 months postoperatively (T4). The results were analyzed using a multilevel generalized linear mixed model. Results Scores on the visual analog scale significantly improved at T1 and T4. The infraorbital blink reflex significantly improved at T4. Visual analog scale scores improved more rapidly than the infraorbital blink reflex. Two-point discrimination significantly improved in all areas at T4, and the vibration perception threshold significantly improved in the eyelid at T4. Conclusions Recovery of the infraorbital blink reflex reflected the recovery of infraorbital nerve dysfunction. We also determined that the lip tended to recover later than the other areas innervated by the infraorbital nerve.

• 한국게임학회 논문지
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• 제7권4호
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• pp.117-123
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• 2007

본 논문은 컴퓨터 바둑에서 돌의 영향력(Stone Influence)과 영향력점(Influence Point) 그리고 영향력 영역(Influence Area)을 제안한다. 돌의 영향력은 놓인 돌과 빈 정점사이의 거리에 따라 정의하며, 영향력점은 돌의 영향력에 대해 임계치를 이용하여 정의한다. 형세평가를 위한 요소로 영향력 영역을 영향력점 덩어리와 코어를 이용하여 정의한다. 저자는 정석 자료를 이용한 실험을 통해서 영향력점의 임계치를 구하였으며, 영향력 영역이 바둑 게임에서 세력으로 성공적으로 적용 가능하였습니다.

• 한국방송∙미디어공학회:학술대회논문집
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• 한국방송∙미디어공학회 2022년도 하계학술대회
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• pp.825-828
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• 2022

In this paper, we propose an efficient image size selection method for video-based point cloud compression. The current MPEG video-based point cloud compression reference encoding process configures a threshold on the size of images while converting point cloud data into images. Because the converted image is compressed and restored by the legacy video codec, the size of the image is one of the main components in influencing the compression efficiency. If the image size can be made smaller than the image size determined by the threshold, compression efficiency can be improved. Here, we studied how to improve the compression efficiency by selecting the best-fit image size generated during video-based point cloud compression. Experimental results show that the proposed method can reduce the encoding time by 6 percent without loss of coding performance compared to the test model 15.0 version of video-based point cloud encoder.

• The Journal of Korean Physical Therapy
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• 제23권2호
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• pp.53-59
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• 2011

Purpose: This study was designed to compare the effects of transcutaneous electrical nerve stimulation (TENS) and silver spike point (SSP) therapy on current perception threshold (CPT) and mechanical pain threshold (MPT). Methods: Forty-five healthy adult male and female subjects were studied. Fourteen of them were males and twenty-one were females. Subject were randomly assigned to receive; (1) TENS (80/120 Hz alternating frequency), (2) SSP (3 Hz), or (3) no treatment (control group). Electric stimulation was applied over LI4 and LI11 on acupuncture points of the left forearm for 30 minutes. CPT and MPT were recorded before and after electrical stimulation. The data were analyzed using linear mixed models, with group treated as a between subject factor and time a within-subject factor. Results: At 30 minutes after cessation of electrical stimulation the CPT of C fibers and A${\delta}$fibers was reduced in the TENS group that of C fibers was reduced in the SSP group (p<0.05). After cessation of electrical stimulation, the MPT of C fibers and A${\delta}$fibers increased in the TENS group, and that of A${\delta}$fibers increased in the SSP group (p<0.05). Conclusion: After TENS and SSP stimulation, MPT of C fibers and A${\delta}$fibers were selectively increased. In particular, the TENS group showed increases in both C and A${\delta}$fibers, while the SSP group showed increases only in A${\delta}$fibers.

• The Journal of Korean Physical Therapy
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• 제26권6호
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• pp.379-385
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• 2014

Purpose: This study was to determine the immediate effects of pulsed magnetic field (PMF) in subjects with upper trapezius (UT) trigger point (TrP). Methods: Fifteen subjects with UT TrP were recruited for the study's PMF group (pain threshold=$2.29kg/cm^2$), and 15 age-, weight-, and gender-matched subjects with UT TrP were recruited for control group (pain threshold=$2.25kg/cm^2$). Pressure algometer was used to measure pressure pain threshold on UT TrP and, cervical range of motion (ROM) inclinometer was used to measure cervical ROM. Surface electromyography was used to record UT, lower trapezius, and serratus anterior muscle activity and relative ratio during scapular plane abduction between pre- and post-treatment. Results: The PMF effectively improved pain threshold and concurrently increased ROM (rotation to the painful side, lateral flexion to the nonpainful side). In addition, the PMF may effectively deactivate UT activity during abduction and the muscle activity ratio between UT and serratus anterior. Conclusion: These findings provided empirical evidence that PMF can be an effective treatment method to reduce pain threshold, to increase cervical ROM, and deactivate UT activity in individuals with TrP.

• 혜화의학회지
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• 제22권2호
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• pp.155-162
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• 2014

Objective : The purpose of this study was to investigate the effects of acupuncture treatment on frequently adopted acupuncture point and self exercise therapy for lumbar sprain patient Methods : For this study, a retrospective chart review was conducted. Data are derived from lumbar sprain patients who have received hospital treatment in Daejeon Univ. Cheon-Ahn Korean Hospital. All patients were treated with acupuncture treatment on high frequency acupuncture point (BL25, BL23, BL24, GB30, BL40, BL26, BL60, GB34), physical therapy and herbal medicine and self exercise therapy(Swiss ball exercise, Lumbar stabilization exercise.) We measured visual analogue scale(VAS), Oswestry disability index(ODI), Pain threshold twice(pre-treatment and post-treatment) on 1st day and 5 days later. Results : After being treated, lumbar sprain patients were meaningful improved in VAS, ODI, pain threshold The VAS score, ODI score were statistically decreased after treatment and the pain threshold was statistically increased after treatment. Conclusion : In this study, treatment on frequently adopted acupuncture point and self exercise therapy were effective on lumbar sprain patient.

• 한국전기전자재료학회논문지
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• 제17권10호
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• pp.1049-1055
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• 2004

Chemical Mechanical Polishing (CMP) is referred to as a three body tribological system, because it includes two solids in relative motion and the CMP slurry. On the assumption that the abrasives between the pad and the wafer could be a major reason not only for the friction force but also for material removal during polishing, the friction force generated during CMP process was investigated with the change of abrasive size and concentration of CMP slurry. The threshold point of average coefficient of friction (COF) with increase in abrasives concentration during interlayer dielectric (ILD) CMP was found experimentally and verified mathematically based on contact mechanics. The predictable models, Mode I (wafer is in contact with abrasives and pad) and Mode II (wafer is in contact with abrasives only), were proposed and used to explain the threshold point. The average COF value increased in the low abrasives concentration region which might be explained by Mode I. In contrast the average COF value decreased at high abrasives concentration which might be regarded to as Mode II. The threshold point observed seemed to be due to the transition from Mode I to Mode II. The tendency of threshold point with the variation of abrasive size was studied. The increase of particle radius could cause contact status to reach transition area faster. The correlation between COF and material removal rate was also investigated from the tribological and energetic point of view. Due to the energy loss by vibration of polishing equipment, COF value is not proportional to the material removal rate in this experiment.

• 스마트미디어저널
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• 제5권4호
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• pp.26-40
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• 2016

최근 모바일 기기가 발전함에 따라 사용자의 위치 수집 및 분석 방법에 대한 연구가 활발히 이루어지고 있다. 사용자의 위치분석 방법 중 궤적 데이터 마이닝은 사용자의 궤적을 바탕으로 의미 있는 정보를 추출하기 위해 사용된다. 궤적 데이터 마이닝을 수행하기 위해서는 사용자의 GPS 궤적을 분석하여 Stay Point를 추출하는 과정이 선행되어야 한다. 기존의 Stay Point 추출 알고리즘은 두 가지의 임계값이 필요하며 해당 임계값들은 사용자가 임의로 설정함으로써 알고리즘의 신뢰도가 떨어지고, 실내에서 머문 지점과 실외에서 머문지점에 대한 구분이 없기 때문에 Stay Point 위치의 모호성이 높아지는 문제점이 있다. 본 논문에서는 통계적 분석방법을 이용하여 SP를 추출하는 방법을 제안한다. 제안 알고리즘은 가우시안 확률분포를 사용하여 실내와 실외 SP를 각각 추출함으로써 SP 위치의 모호성을 개선하였다. 또한, 사용자가 임의로 설정하는 임계값이 없기 때문에 알고리즘의 신뢰도를 향상시켰다.