• Journal of Periodontal and Implant Science
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• 제34권1호
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• pp.35-48
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• 2004

Since the occlusal loading is transmitted to the surrounding bone, the success of an implant treatment is closely related to the distribution of the stress on the implant. The finite element analysis method is often used in order to produce a model for dispersion of stress. Assessment of the success of the implant is usually based on the degree of osseointegration which is a bone and implant surface interface. Implant used in this research was designed through the method of shape optimization after the stress on implant was anaylzed by the finite element analysis method. This study was pertinently assessed by a clinical, histologic, histomorphometric analysis after the shape optimized implant was installed on beagle dog tibia. The results are as follows 1. It clinically showed a good result without mobility and imflammatory reaction. 2. Implant was supported by dense bone and bone remodeling showed on the surrounding area of the implant 3. The average percentage of bone-implant contact was 58.1%.The percentage of bone density was 57.6%. Having above results, shape optimized implant showed the pertinence through clinical and histologic aspects. However, to use the shape optimized implant, the further experiment is required for finding problems, improvement.

• 한국전문물리치료학회지
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• 제21권2호
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• pp.8-17
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• 2014

The purpose of this study was to examine the effects of hip joint mobilization (HJM) on walking ability, balance ability, and the joint range of motion in stroke patients to minimize the problems of the musculoskeletal system in patients with central nervous system diseases. All volunteers were randomly assigned to the HJM group ($n_1=14$) and the general neurodevelopment therapy (NDT) group ($n_2=16$). The HJM procedure involved applying Maitland mobilization techniques (distraction, lateral gliding, inferior gliding, and anterior gliding) by grade 3 to both hip joint. The mobilization process included mobilization and NDT for 15 min/day, 3 days a week for 4 weeks. The outcome measures were evaluated, including the hip joint passive range of motion (ROM) test and femur head anterior glide test (FHAG) using prone figure four test, dynamic and static balance abilities [timed up and go (TUG) test and center of pressure (COP) analysis], and walking ability [10-meter walking test (10MWT) and 6-min walking test (6MWT)]. Both the groups showed significant post-training differences in the hip joint ROM (FHAG and degree of hip extension) and 10MWT. The post-training improvements in the TUG test were significantly greater in patients of the HJM group than in the NDT group; however, there were no post-training improvements in COP in both groups. Patients in the HJM group showed post-training improvement in the 6MWT; however, statistically significant differences were not observed. Patients in the NDT group showed post-training improvements in the 6MWT. These results suggest that HJM improves hip joint ROM, dynamic balance ability, and walking speed in stroke patients. However, further studies are required to evaluate the long-term therapeutic efficacy of HJM in stroke patients.

• 한국전문물리치료학회지
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• 제20권3호
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• pp.9-18
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• 2013

The study aimed to compare the effect of the treadmill walking training combined with obstacle-crossing (TWT-OC) and treadmill walking training (TWT) on the walking function of patients with chronic stroke. 29 subjects volunteered to participate in this study; they were randomly assigned to either TWT-OC group (15 subjects) or TWT group (14 subjects). Subjects from the TWT-OC group underwent a treadmill walking combined with obstacles-crossing for 30 minutes daily, three days a week for four weeks, whereas subjects from the TWT group received only a treadmill walking. The 10 m walk test (10MWT), 6-min walk test (6MWT), berg balance scale (BBS), timed up and go test (TUG), activities-specific balance confidence-Korean version (ABC-K), and walking ability questionnaire (WAQ) were measured before and after the 4-week training. The TWT-OC group showed significantly better functional mobility of walking and balance measured by 6MWT (p<.01), BBS (p<.01), and TUG scores (p<.05) when compared with those of the TWT group. Further, within-group comparison showed significant improvement in all variables (p<.01) except for 10MWT. These findings suggest that the TWT-OC and TWT may be helpful for improving the walking function of patients with chronic stroke, and the TWT-OC has probably more favorable outcomes for chronic stroke, however, further trials with wider range of subjects are warranted for generalization and clinical relevance.

• 복식
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• 제57권2호
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• pp.1-10
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• 2007

This study aims at the improvement of sewing function through understandings of dynamic property about the sewing methods and the thread material selection in knitwear. The tensile strength and shear of KES-FB and the Instron were measured for the analysis of the mechanical properties. The knit cloth was structured In the plain stitch, $1\times1$ rib stitch and $2\times1$ rib stitch with the combination of wool and cotton. With regard to the sewing method, intralooping and interlacing were applied. For thread materials, polyester, cotton, wool and silk were used. Since silk has the lowest extension and similar values regardless of its construction in intralooping, it is available knit apparel with uniform elastic recoverv. It also has small shearing resistance. It can be used in apparel which needs big mobility, but it causes rutting problem. Therefore, it is suitable to use intralooping. When the same sewing yarn and textile are use, it can lower shearing resistance and extension in intralooping, Since wool needs a lot of extension energy and it can be cut, intralooping is more suitable than interlacing in sewing of wool. In interlacing using polyester, extension and shearing resistance are high. Therefore, it is suitable for knit sewing with high massing. Silk is not suitable for interlacing since it can be rut. Even though knit materials are different, the RT values of polyester and cotton are similar in same construction. Therefore, they can be substituted each other considering resilience after sewing.

• 문화기술의 융합
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• 제6권3호
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• pp.167-174
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• 2020

본 연구는 실외 동작활동을 연계한 수학활동이 유아의 운동능력에 어떠한 영향을 미치는지 알아보는 데 목적이 있다. 경기도에 위치한 S유치원 만 5세 유아를 대상으로 총 15주간의 프로그램을 실시하였다. 본 연구의 유아 운동능력 검사에서는 지성애(2007)의 유아 운동능력 검사 척도를 사용하였다. 각 영역은 모두 5점 평정척도로 구성되어 있다. 검사 문항의 수는 총 33개 문항이다. 유아의 운동능력에 대한 사전검사와 사후검사를 실시하였다. t 검증을 사용하였다. 본 연구 결과, 실외 동작활동을 연계한 수학활동이 유아의 전체 운동능력, 비이동 운동 능력, 이동 운동 능력의 증진에 긍정적인 효과가 있는 것으로 나타났다. 본 연구의 결과를 바탕으로 한, 실외 동작활동과 통합한 다양한 프로그램이 개발되어 현장에 적용될 것으로 기대한다.

• 디지털콘텐츠학회 논문지
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• 제15권3호
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• pp.319-326
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• 2014

IEEE 802.11 무선랜은 CSMA/CA(Carrier Sense Multiple Access/Collision Avoidance) 방식의 MAC(Media Access Control) 프로토콜을 사용하며, 데이터 충돌을 회피하기 위하여 데이터 전송 시 다른 사용자가 채널을 사용하고 있는지를 캐리어 감지를 통해 확인하게 된다. 현재 IEEE 802.11 표준에서는 캐리어 감지 범위에 영향을 주는 임계값을 일정한 고정 값으로 운용을 하고 있는데, 모바일 Ad-hoc 네트워크와 같이 이동성으로 인해 가변성이 큰 경우에는 고정 특정 캐리어 감지 임계값으로는 효율적인 네트워크 운영이 어렵다. 본 논문에서는 신호대간섭잡음비를 고려하여 캐리어 감지 임계값과 전송속도를 적절히 선택하는 제안된 SINR 기반 동적 캐리어 감지 임계값 방법을 모바일 Ad-hoc 네트워크 환경에 맞게 운영을 함으로써 더 좋은 네트워크 처리율을 얻을 수 있음을 보여준다.

• 한국컴퓨터정보학회논문지
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• 제19권1호
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• pp.43-55
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• 2014

SPDY는 기존 HTTP(Hypertext Transfer Protocol)/1.1의 문제점을 보완하여 웹 속도를 향상시키기 위한 목적으로 구글에서 새롭게 제안한 프로토콜이다. 본 논문은 다양한 환경에서의 성능 측정을 실시함으로써 SPDY 프로토콜의 특징을 알아보고 기존 프로토콜과의 차이점을 비교 분석하였으며 나아가 SPDY의 Flow Control에 대해서 좀 더 자세히 살펴보았다. 측정 실험들을 통해 SPDY 프로토콜은 3G 환경에서는 성능 향상을 보이지만 고속의 무선랜 환경과 이동체 환경에서는 뚜렷한 성능 향상을 보이지 못하는 문제점이 있음을 파악하였으며 Flow Control 역시 제대로 동작하지 않고 있음을 확인하였다. 마지막으로 성능 측정 실험 결과와 이에 대한 분석을 바탕으로 하여 SPDY 프로토콜의 개선방향을 제시하였다.

• 대한물리의학회지
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• 제11권4호
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• pp.105-114
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• 2016

PURPOSE: This study is to investigate the therapeutic effect of Tetrax on balance dysfunction caused by ataxia in cerebellar stroke. METHODS: A total of thirty subjects with cerebellar stroke were recruited. The participants was divided into two groups, the experimental (n=15) and the control group (n=15). Tetrax training and conventional physical therapy (CPT) were performed in experimental group, whereas the patients in the control group were treated with CPT twice a day. Each session of the Tetrax and CPT was carried out for 30 minutes, 5 times per week for 4 weeks. Korean version of the Scale for the Assessment and Rating of Ataxia (K-SARA) was the primary outcome measure, and the secondary outcomes covered Berg balance scale (BBS), falling index (FI), Timed up and go (TUG), and modified Barthel index of Korean version (K-MBI). All outcome measures were evaluated before and after 4 weeks. RESULTS: K-SARA was decreased significantly after 4 weeks intervention in both the experimental (p<.05) and the control group (p<.05). Furthermore, the experimental group produced significantly better outcomes in K-SARA, BBS, FI, and TUG compared with the control group (p=.012, p=.027, p=.008, and p=.048). There were significant correlations between K-SARA and BBS, FI, TUG, and K-MBI (p<.001, p<.001, p=.004, and p<.001). CONCLUSION: The restoration of ataxia was related with the improvement of the balance, falling risk, mobility, and activity of daily living. Tetrax training was effectively aided recovery of ataxia after cerebellar stroke.

• Transactions on Electrical and Electronic Materials
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• 제18권1호
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• pp.55-57
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• 2017

Amorphous oxide thin film transistors (TFTs) were fabricated with 0.5 wt% silicon doped zinc tin oxide (a-0.5SZTO) thin film deposited by radio frequency (RF) magnetron sputtering. In order to investigate the effect of annealing treatment on the electrical properties of TFTs, a-0.5SZTO thin films were annealed at three different temperatures ($300^{\circ}C$, $500^{\circ}C$, and $700^{\circ}C$ for 2 hours in a air atmosphere. The structural and electrical properties of a-0.5SZTO TFTs were measured using X-ray diffraction and a semiconductor analyzer. As annealing temperature increased from $300^{\circ}C$ to $500^{\circ}C$, no peak was observed. This provided crystalline properties indicating that the amorphous phase was observed up to $500^{\circ}C$. The electrical properties of a-0.5SZTO TFTs, such as the field effect mobility (${\mu}_{FE}$) of $24.31cm^2/Vs$, on current ($I_{ON}$) of $2.38{\times}10^{-4}A$, and subthreshold swing (S.S) of 0.59 V/decade improved with the thermal annealing treatment. This improvement was mainly due to the increased carrier concentration and decreased structural defects by rearranged atoms. However, when a-0.5SZTO TFTs were annealed at $700^{\circ}C$, a crystalline peak was observed. As a result, electrical properties degraded. ${\mu}_{FE}$ was $0.06cm^2/Vs$, $I_{ON}$ was $5.27{\times}10^{-7}A$, and S.S was 2.09 V/decade. This degradation of electrical properties was mainly due to increased interfacial and bulk trap densities of forming grain boundaries caused by the annealing treatment.

• Asian-Australasian Journal of Animal Sciences
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• 제29권9호
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• pp.1229-1238
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• 2016

This study was conducted to determine the relationships of five intragenic single nucleotide polymorphism (SNP) markers (protein kinase adenosine monophosphate-activated ${\gamma}3$ subunit [PRKAG3], fatty acid synthase [FASN], calpastatin [CAST], high mobility group AT-hook 1 [HMGA1], and melanocortin-4 receptor [MC4R]) and meat quality traits of Duroc breeding stocks in Korea. A total of 200 purebred Duroc gilts from 8 sires and 40 dams at 4 pig breeding farms from 2010 to 2011 reaching market weight (110 kg) were slaughtered and their carcasses were chilled overnight. Longissimus dorsi muscles were removed from the carcass after 24 h of slaughter and used to determine pork properties including carcass weight, backfat thickness, moisture, intramuscular fat, $pH_{24h}$, shear force, redness, texture, and fatty acid composition. The PRKAG3, FASN, CAST, and MC4R gene SNPs were significantly associated with the meat quality traits (p<0.003). The meats of PRKAG3 (A 0.024/G 0.976) AA genotype had higher pH, redness and texture than those from PRKAG3 GG genotype. Meats of FASN (C 0.301/A 0.699) AA genotype had higher backfat thickness, texture, stearic acid, oleic acid and polyunsaturated fatty acid than FASN CC genotype. While the carcasses of CAST (A 0.373/G 0.627) AA genotype had thicker backfat, and lower shear force, palmitoleic acid and oleic acid content, they had higher stearic acid content than those from the CAST GG genotype. The MC4R (G 0.208/A 0.792) AA genotype were involved in increasing backfat thickness, carcass weight, moisture and saturated fatty acid content, and decreasing unsaturated fatty acid content in Duroc meat. These results indicated that the five SNP markers tested can be a help to select Duroc breed to improve carcass and meat quality properties in crossbred pigs.