According to the statistics of the last five years, fishing vessel accidents accounted for about 80% of collisions of all ships and has led to many casualties. To prevent collision accidents, it is important to assess the collision risk potential related to the sailing characteristics of fishing vessels. The authors represented the traffic patterns of vessels that sail around Wando waters based on Automatic Identification System (AIS) and Radio Detecting and Ranging (RADAR) data. The authors analyzed the statistical near miss data between fishing vessels and non-fishing vessels in the Wando Vessel Traffic Services (VTS) area and assessed the risk of ship collisions. From this research, the authors identified waters with a high risk of ship collisions. The analyzed results can be used as basic data to develop collision prevention strategies which aides the decision making and efficient operation of VTS officers (VTSO.)

G192.8-1.1 has been known as one of the faintest supernova remnants (SNRs) in the Galaxy until the radio continuum of G192.8-1.1 is proved to be thermal by Gao et al. (2011). Yet, the nature of G192.8-1.1 has not been fully investigated. Here, we report the possible discovery of faint non-thermal radio continuum components with a spectral index α ~ 0.56 (Sν∝ν^-α) around G192.8-1.1, while most of the radio continuum emission is thermal. Also, our Arecibo Hi data reveal an Hi shell, expanding with an expansion velocity of 20 – 60 km s-1 , that has an excellent morphological correlation with the radio continuum emission. The estimated physical parameters of the Hi shell and the possible association of non-thermal radio continuum emission with it suggest G192.8-1.1 to be an ~ 0.3 Myr-old SNR. However, the presence of thermal radio continuum implies the presence of early-type stars in the same region. One possibility is that a massive star is ionizing the interior of an old SNR. If it is the case, the electron distribution assumed by the centrally-peaked surface brightness of thermal emission implies that G192.8-1.1 is a “thermal-composite” SNR, rather than a typical shell-type SNR, where the central hot gas that used to be bright in X-rays has cooled down. Therefore, we propose that G192.8-1.1 is an old evolved thermal-composite SNR showing recurring emission in the radio continuum due to a nearby massive star. The infrared image supports that the Hi shell of G192.8-1.1 is currently encountering a nearby star forming region that possibly contains an early type star(s).

The purpose of this study was to investigate the effects of active and passive postural perturbation on ankle dorsiflexor responses in stroke patients. The subjects consisted of 13 stroke patients. Using wireless electromyography, the patients’ ankle dorsiflexor muscle responses were measured under the following conditions: active dorsiflexion (AD), active perturbation (AP), and passive perturbation (PP). Tibialis anterior muscle activity increased most significantly during PP of the affected side (118.64±56.28). The most significant increase for the non-affected side was in AD (72.64±24.56). Tibialis anterior muscle activity was compared under each condition. The affected side showed significant differences between PP and AD and between PP and AP (p<.05). The non-affected side showed not significant differences between each condition. The ratios of tibialis anterior muscle activity under AP to that under AD were 1.00 on the affected side and .75 on the non-affected side and the difference was not significant (p>.05). The ratios of tibialis anterior muscle activity under PP to that under AD were 3.30 on the affected side and 1.14 on the non-affected side and the difference was significant (p<.05). Passive perturbation improved tibialis anterior muscle activity on the affected side, and training based on this approach may have the potential to improve the ankle dorsiflexion of people with stroke.

The trochanteric prominence angle test (TPAT) has been used to measure the femoral anteversion angle between the tibial crest and the vertical line. However, the exact anatomical reference of the tibial crest has not yet been identified in the literature. Thus, the purposes of this research were twofold: first, to compare the femoral anteversion angle measured at three different anatomical references of the tibial crest (the proximal tibial crest, the proximal third of tibial crest, and the proximal half of tibial crest) and, second, to determine inter-and intra-rater reliabilities of the femoral anteversion angle measured at these three different anatomical references of the tibial crest during the TPAT. We recruited 14 healthy subjects, and a total of 28 legs were examined. The TPAT was measured using a digital inclinometer. A 1-way repeated-measure analysis of variance was used to compare the femoral anteversion angle measured at three different anatomical references of the tibial crest, and intraclass correlation coefficients (ICCs) were calculated to determine reliability. The femoral anteversion angle measured at the proximal tibial crest was significantly higher than that at the proximal third of the tibial crest and the proximal half of the tibial crest. The inter-and intra-rater reliabilities of femoral anteversion angle were measured at three anatomic references of the tibial crest were all found to be high during the TPAT (ICC=.9 0~.98). In conclusion, clinicians should recognize that the different degrees of the femoral anteversion angle could be measured when different anatomical references of the tibial crest were used, and that reliabilities were high when an exact anatomical reference of the tibial crest was used during the TPAT.

서론 : 본 연구는 문헌 고찰을 통해 다양한 형태의 촉각적 제시장치와 그 발달과정에 대해 연구했다. 또한 촉각적 제시장치의 사용과 연구에 있어서 유니버셜 디자인 모델의 적용을 고찰하고 제안하였다. 본론 : 촉각적 제시장치는 사람들이 보다 접근성 있는 삶을 살아갈 수 있도록 만들어주는 한 수단으로 사용되어 왔다. 그것들은 시각적, 청각적, 또는 다른 감각이 손상되었을 때 정보를 나타내 줄 수 있는 변형된 방법을 제공 한다. 촉각적 제시장치는 크게 촉각-기반의 형태와 전력-기반의 형태로 분류될 수 있다. 촉각-기반의 제시장치 는 피부에 가해지는 진동 감각에 의해 자극되는 것이고 전력-기반의 형태는 자극제로서 전기적 전류를 사용하는 것이다. 촉각적 제시장치의 복잡성은 의도된 사용에 따라 달라지는데, 현재 단일요소적, 1차원적, 2차원적, 그리고 3차원적 장비들이 사용 가능하다. 촉각적 제시장치들은 그 크기와 필요한 전력이 다양해서 별개의 적절한 수단을 사용하여 촉감을 이용한 접근성을 제공해 준다. 그것들은 초반에는 시각장애를 지닌 사람들의 접근성을 향상시키는데 기여했으나, 최근에는 그 사용이 확대되고 있다. 촉각적 제시장치의 첫 출현 이후 그 기술은 접근성과 상품성 측면에서 점점 진화되어 왔고 그래서 사람들은 더 멋있고 기능적이고 저가의 제품들을 이용할 수 있게 되었다. 촉각적 제시 및 제어장치의 사용은 지남, 조종, 그리고 의사소통에 있어서의 접근성을 촉진시킨다. 그러나 그 혜택은 아직 특정한 장애를 지닌 사람들에게 제한되어 있다. 결론 : 촉각적 제시장치의 잠재적 혜택을 모든 사람에게 최대화시키기 위해서는, 그것이 특정 질병을 보상하기 위 해서뿐만 아니라 일상의 평범한 삶을 보다 편리하게 만들기 위함으로 확장되는 것이 바람직하다. 이러한 관점에서, 다양한 인간 요소들을 연구하여 촉각적 제시장치의 발전을 보장하는 것이 중요하다. 또한 향후 촉각적 제시 장치의 발전에 있어서 특정한 적용을 위한 필요들뿐만 아니라 유니버셜 디자인까지 고려되어야 할 것이 제안된 다.

Second language (L2) research has reported a facilitative role of interaction in L2 learning. It points out that interactional corrective feedback (ICF), which naturally occurs during negotiation for meaning, is one of many benefits. Research argues that such feedback can draw learners’ attention to their nontargetlike utterances. However, many researchers question whether ICF is perceived by learners as correction to language in meaning-based classrooms since it is interwoven with an on­going conversation. In light of this, the current study aims to investigate in nine intact classrooms how learners perceive ICF. In doing so, the study pioneers in the investigation of how learners perceive ICF differently depending on whether they are direct or indirect recipients. In addition, the study examines whether the type of ICF plays a role in learner perception. The study analyzed stimulated recall interviews from 45 students to measure learner perception. The results show that learners perceived about 50% of ICF as correction and that they were generally more sensitive to the corrective function of feedback when they were direct recipients. However, when instructors use recasts, there is no significant difference in learner perception between direct recipients and indirect recipients.

Two component polyurethane (PU) flame retardant coatings were prepared by blending trichloro modified polyesters (TCMPs) and isophorone diisocyanate isocyanurate. TCMPs were synthesized by polycondensation of trichlorobenzoic acid (TCBA), a flame retardant component, with adipic acid, 1,4 butanediol, and trimethylolpropane. The content of TCBA was varied in 10, 20, and 30 wt% for the reaction. Theses new flame retardant coatings showed various properties comparable to other non flame retardant coatings. Moreover, we carried out the combustion test and the flammability test for our flame retardant coatings. The results of vertical burning test for the coatings containing more than 20 wt% of TCBA were determined as no burn. The results of flammability test for the coatings with 20 wt% and 30 wt% of TCBA contents indicated the limiting oxygen index (LOI) values of 26% and 29% respectively, which implied relatively good flame retardancy.

To prepare weather-resistant modified silane acrylic resin coatings for an architectural purpose, tetrapolymers were synthesized by radical polymerization. 3-Methacryloxypropyltrimethoxysilane (MPTS) as a silicone monomer and n-butyl acrylate, methyl methacrylate, and n-butyl methacrylate as acrylic monomers were used. The composition of monomers was adjusted to fix the glass transition temperature of acrylic polymer for 20℃. The composition of MPTS in the synthesized polymer were varied from 10 wt% to 30 wt%. On the basis of synthesized resin amber paints were prepared and their physical properties and effects on weatherability were examined. The presence of MPTS in modified silane acrylic resins generally resulted in low molecular weight and broad molecular weight distribution, and also lowered the viscosity of the copolymers. The coated films prepared from these resins showed good and balanced properties in general. Adhesion to the substrate was outstanding in particular. Weatherability tests were carried out in three different types such as outdoor exposure, QUV, and SWO. The test results showed that the modified silane acrylic resins containing 30 wt% of MPTS had superior weathering properties.

이 논문에서는 게이트 절연막 위에 vapor deposition polymerization(VDP)방법을 사용하여 성막한 유기 점착층을 진공 열증착하여 유기 박막 트랜지스터(OTFTs)소자를 제작할 수 있음을 증명하였다. 우리가 제작한 Staggered-inverted top-contact 구조를 사용한 유기 박막 트랜지스터는 전기적 output 특성이 포화 영역안에서는 포화곡선을, triode 영역에서는 비선형적인 subthreshold를 확실히 볼 수 있음을 발견했다. 0.2μm 두께를 가진 게이트 절연막위에 유기 점착층을 사용한 OTFTs의 장 효과 정공의 이동도와 문턱전압, 그리고 절멸비는 각각, 약 0.4cm2/Vs, -0.8V, 106 이 측정되었다. 게이트 절연막의 점착층으로써 폴리이미드의 성막을 위해, 스핀코팅 방법 대신 VDP 방법을 도입하였다. 폴리이미드 고분자막은 2,2bis(3,4-dicarboxyphenyl)hexafluoropropane dianhydride(6FDA)와 4,4'-oxydianiline(ODA)을 고진공에서 동시에 열 증착 시킨 후, 그리고 150℃에서 1시간, 다시 200℃에서 1시간 열처리하여 고분자화된 막을 형성하였다. 그리고 점착층이 OTFTs의 전기적 특성에 주는 영향을 설명하기 위해 비교 연구하였다.

The yields of the fractions of n-hexane-soluble, ethyl acetate-soluble and methanol-soluble from the P. densiflora sawdust were obtained 1.36%, 2.21% and 4.03% using organic solvents, respectively (Table 1). The antifungal activity of the n-hexane extracts against L. edodes at concentrations 125, 250, 500, 750 and 1000 ppm were 36.5%, 41.2%, 43.1%, 45.4% and 47.6%, respectively (Table 2). The percent of antifungal activity against L. edodes was the greatest for the n-hexane extracts, ranging from 36.5% to 47.6% at a concentrations of 125 ppm to 1000ppm, with the values for all concentrations significantly different from one another. In this experiment, the antifungal activity by the n-hexane extracts was the highest. This result supposed that the n-hexane extracts have not only many more inhibitory compounds against L. edodes than the ethyl acetate and methanol extracts but also the inhibitory compound may be more easily dissolved by n-hexane than by ethyl acetate or methanol.

The yields of the n-hexane-soluble, ethyl acetate-soluble, methanol-soluble and methanol-insoluble fractions from the powdered water extracts were 8.2%, 10.6%, 32.0% and 49.2%, respectively (Table 1). The antifungal activities of water extracts, n-hexane-soluble fraction, ethyl acetate-soluble fraction, methanol-soluble fraction and methanol-insoluble fraction against L. edodes were 23.5%, 26.2%, 41.5%, 25.4% and 2.5%, respectively, at 1000ppm (Figure3). The ethyl acetate-soluble fraction showed much higher antifungal activity than the other fractions. The antifungal activity of the ethyl acetate-soluble fraction against L. edodes at 1000 ppm showed a statistically significant difference in the fractions of n-hexane-soluble, ethyl acetate-soluble, methanol-soluble and methanol-insolub

1. Antifungal activity of water extracts The antifungal activity of the water extracts against L. edodes was proportional to the concentration of the water extracts. The antifungal activity of the water extracts at 1000 ppm was the highest among the tested concentration against L. edodes mycelia. The antifungal activity were significantly different from each concentration of the water extracts. Therefore, it can be concluded that the water extracts of the P. densiflora sawdust have inhibitory compounds to the growth of L. edodes mycelia. 2. Yield and antifungal activity of fractions from water extracts The powdered water extracts was further treated serially using organic solvents in order to separate the water extracts into the fractions of n-hexane-soluble, ethyl acetate-soluble, methanol-soluble and methanol-insoluble. The ethyl acetate-soluble fraction showed much higher antifungal activity than the other fractions. The antifungal activity of the ethyl acetate-soluble fraction against L. edodes at 1000 ppm showed a statistically significant difference in the fractions of n-hexane-soluble, ethyl acetate-soluble, methanol-soluble and methanol-insoluble. And, there was not significantly difference between the antifungal activities of the n-hexane-soluble and methanol-soluble fractions at 1000 ppm. 3. Antivungal activity of fractions of organic solvent extracts The fractions were isolated from each organic solvent by the silica-gel column chromatography and then the fractions were confirmed and divided on the values of Rf by the thin-layer chromatography. The fractions were produced six band of the n-hexane, nine band of the ethyl acetate and eight band of the methanol extracts. The HIII fraction from the n-hexane extracts showed the highest growth inhibition against L. edodes mycelium.

After having inoculated the mycelium of L. edodes on the block medium, the P. densiflora sawdust of the B and C groups were the slowest of their respective groups on day 169.4 and day 169.9 harvesting times. The first harvest of the fruiting body from the Q. variabilis sawdust of the control medium was obtained on day 162.9