• Science of Emotion and Sensibility
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• v.1 no.1
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• pp.199-211
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• 1998

본 연구의 목적은 한국인을 대상으로 겨울철 체감실험을 통해 SET*(PMV)와 상관관계를 규명하고, ASHRAE Standard 55-74의 쾌적영역과 한국인의 쾌적영역을 비교 검토하는 것이다. 실험에 참가한 각 피험자는 동일한 유니폼을 착용한 체 의자에 앉아 환경시험실에서 2시간 체재하였다. 피험자의 평균피부온도는 신체 3군데에서 측정한 피부온도 값을 이용하였고, 전신온냉감 및 쾌불쾌감 신고는 매 15분 간격으로 측정하였다. 전신온냉감 신고 스케일은 -3= cold, -2=cool, -1=slight cool, o=neutral, +1= Slightly warm, +2=warm, +3=hot 이며, 쾌불쾌감 신고스케일은 0=comfortable, +1=slightly comfortable, +2=uncomfortable, +3=very uncomfortable이다. 겨울철 체감실험을 통해 아래의 결론을 얻었다. 1)전신온냉감이 중립이 될때 청년층의 SET*는 25.5$^{\circ}C$이며, 고령자의 중립온도는 27$^{\circ}C$이었다. 고령자는 청년에 비해 $1.5^{\circ}C$(SET*) 정도 고온을 선호하였다. 2)청년층의 쾌적영역은 24.2-26.8$^{\circ}C$(SET*)이며, 고령자의 쾌적영역은 25.7-28.2$^{\circ}C$이었다. 이러한 쾌적영역은 ASHRAE의 쾌적영역보다 고온지향적임을 알 수 있었다.

• Journal of the Korean Society for Railway
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• v.12 no.1
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• pp.104-109
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• 2009

In order to apply FBG(Fiber Bragg Grating) sensor as one of reliable sensors in the commercial railway structure, the reliability of FBG sensor in the mechanical strength viewpoint have to be confirmed and the maximum strain should surpass the fracture strain of the host structure to measure the measurands until the host structures fail. In this paper, several factors that influence the mechanical failure strength of fiber Bragg grating sensors were analyzed. A set-up for dynamic tensile testing of optical glass fibers with fiber Bragg gratings was made. To increase the FBG failure strength, techniques relying on the H2 loading treatment and stripping methods were established and testified as a result of the tensile strength test of optical fibers.

• Journal of the Korean Society for Library and Information Science
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• v.55 no.4
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• pp.5-22
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• 2021

This study aimed to understand how people perceive the transition from offline to online classes at universities during the COVID-19 pandemic. To achieve the goal, we collected tweets related to online classes on Twitter and performed sentiment and time series topic analysis. We have the following findings. First, through the sentiment analysis, we found that there were more negative than positive opinions overall, but negative opinions had gradually decreased over time. Through exploring the monthly distribution of sentiment scores of tweets, we found that sentiment scores during the semesters were more widespread than the ones during the vacations. Therefore, more diverse emotions and opinions were showed during the semesters. Second, through time series topic analysis, we identified five main topics of positive tweets that include class environment and equipment, positive emotions, places of taking online classes, language class, and tests and assignments. The four main topics of negative tweets include time (class & break time), tests and assignments, negative emotions, and class environment and equipment. In addition, we examined the trends of public opinions on online classes by investigating the changes in topic composition over time through checking the proportions of representative keywords in each topic. Different from the existing studies of understanding public opinions on online classes, this study attempted to understand the overall opinions from tweet data using sentiment and time series topic analysis. The results of the study can be used to improve the quality of online classes in universities and help universities and instructors to design and offer better online classes.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.4
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• pp.2436-2441
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• 2015

BSR noise from automobiles is largely issued in recent as an emotional quality. This study describes the two test methods for determining BSR noise occurred in automotive seat system. First, the sine sweep test is found to be an effective excitation method for determining BSR noise with high frequency. Second, BSR operation test is introduced in such a way that BSR noise during operation of seat height system is measured by several accelerometer at each 800 cycles until 6400 cycles. The periodic noise signal is captured during one cycle after many cycles of operation. Two test method presented in this paper can be analyzed more efficiently BSR noise of the seat.

• Journal of Aquaculture
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• v.21 no.1
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• pp.7-12
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• 2008

Toxicity of ten commercial disinfectants(hydrogen peroxide, sodium hypochlorite, chlorine dioxide, povidon iodine, formaldehyde, glutaraldehyde, quaternary ammonium compounds(QAC), didecyl dimethyl ammonium chloride(DDAC), ortho-dichlorobenzene, and copper sulfate) was measured by chinook salmon embryo-214 cell line and three fish species: flounder Paralichthys olivaceus, black rockfish Sebastes pachycephalus, and black sea bream Acanthopagrus schlegelii. The $LC_{50}$ levels of 24 hours acute toxicity with the ten disinfectants were tested in three species of fish. Effectiveness of ten chemical disinfectants were varied by each chemical as well as by species. Hydrogen peroxide showed the higest activity at 201, 269, and 139 ppm in the flounder, the black rockfish, and black sea bream, respectively. DDAC showed the lowest activity at 2.1, 1.0, and 1.5 ppm in the flounder, the black rockfish, and black sea bream, respectively. The highest variation was observed in copper sulfate by both the chemicals and the species.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.15 no.8
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• pp.4776-4783
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• 2014

Many studies have examined the reduction of primary noise sources, but quality-related noise, such as BSR, is rarely studied. This study describes the quantitative BSR test method using a multi-axial simulator. The sine sweep test was conducted to detect the system resonance and its relation to BSR noise with high frequency. This method is applied to the seat frame with/without the vibration durability test. The results showed that the $1^{st}$ lateral resonance leads to higher BSR frequency noise. In addition, the reduction of the lateral mode system stiffness after the durability test results in a decrease in the BSR noise in sine sweep test mode.

• KOREAN JOURNAL OF PACKAGING SCIENCE & TECHNOLOGY
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• v.30 no.2
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• pp.149-160
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• 2024

One of the main functions of packaging is promoting the products. Competitive markets demand that products appeal more to consumers in many perspectives. Other than its original purpose, which is protection, packaging has been tasked with implementing the emotional appeal of a product through unique shapes, textures, and visual designs. Understanding emotional appeals to consumer is a potential marketing strategy so that research have been done about techniques to visualize the design and print the specific textures. Especially, paper-like films are known as eco-friendly or emotional design and they are able to protect the products from oxygen or water vapor better than papers. In this study, paper-like films, which is printed with inks to have rougher surfaces, are analysed in terms of roughness, friction, imaging and sensory evaluation of subjective softness from consumers. Also, the prediction model was established with the correlation of the measured results and sensory panel test (SPT) of consumer preferences by touch. The results showed that the prediction of subjective texture preference was contributed by 63.9% for surface roughness and 36.1% for friction profile parameters. It confirmed that surface roughness characteristics should be prioritized to improve tactile preference for paper-like films.

• Journal of fish pathology
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• v.19 no.3
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• pp.277-284
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• 2006

Application of wood vinegar in fish farms has been used for the disinfection of pathogenic microorganisms and the treatment of infectious diseases. This study was performed to know the acute toxicity of wood vinegar to carp Cyprinus carpio, flounder Paralichyhus olivaceus, rock fish Sebastes schlegeli and black sea bream Pagrus major. The 24 hr, 48 hr and 96 hr LC50 respectively were: carp 1243, 1143 and 1016 ppm; flounder 1397, 1253 and 1226 ppm; rock fish 1058, 993 and 967 ppm; and black sea bream 650, 616 and 596 ppm. Death and survival of fish exposed to lethal concentrations of wood vinegar were apparently related to massive necrosis, fusion and epithelial lifting of gill lamellar epithelium, suggesting the osmotic imbalance and lack of oxygen uptake.

• Science of Emotion and Sensibility
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• v.16 no.1
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• pp.85-94
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• 2013

Recently, researches of piezoelectric energy harvesting were tried and in this study, a piezoelectric energy harvesting clothes was developed. First, piezoelectric energy harvesting zone on the extremities were drawn by 3D motion capturing and as a result, the hip, the elbow, and the knee were determined. A new structure of piezoelectric harvester was developed for appling to clothes. Because it needed to be flexible and sensitive for human body, the 2 layer stacked structure was proposed. A prototype of seamless garment was designed for a harvesting clothes because it needed to be body-tight and not to restrict the movement. High peak-to-peak voltages were acquired from the energy harvesting clothes.

• Proceedings of the Korean Society for Emotion and Sensibility Conference
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• 1999.03a
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• pp.219-219
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• 1999

마직물은 통기성, 흡수성, 투습성이 좋고 건조가 빠른 편이므로 여름철 직물로 많이 사용되어 왔다. 마직물은 또한 뻣뻣하며 몸에 감기지 않고 촉감이 깔깔하여 시원한 느낌을 주며 다른 직물에 비해 강직하고 표면이 거칠고 드레이프성이 떨어지는 등의 독특한 태를 가지고 있다. KES-F 시험기에 의해 여러 물성량들을 종합적으로 계측할 수 있게 됨에 따라 의복의 착용감에 만족을 주는 소재의 성능에 대한 연구가 종래의 주관적평가에서 KES-F 시스템을 이용하여 객관적으로 태를 예측하는 방법으로 진행되고 있다. 그러나 태를 평가하는 객관적 방법에서는 일반적으로 Kawabata와 Niwa에 의해 만들어진 평가식들이 주로 사용되나 이런 식들은 주로 모직물이나 합성섬유직물들을 평가하기에는 적합하지만 마직물의 독특한 태를 평가하기에는 부족하다고 생각된다. 마직물의 태가 기존의 객관적 평가방법만으로는 규명되지 않기 때문에 주관적 태평가방법을 아울러 실시해야 할 필요가 있다고 생각된다. 따라서 본 연구에서는 마직물의 태를 평가하는 방법의 하나로 주관적 평가척도를 개발하고 이 척도를 사용하여 마직물의 주관적인 태 특성을 살펴보았다. 그리고 KES-FB 시스템을 사용한 객관적인 태를 측정하여 주관적 평가치와 객관적 측정치로부터 태 평가의 산출식을 유도하였다. 실험에 사용된 직물은 혼방률, 밀도, 두께 등이 다양한 암, 저마 그리고 마혼방직물과 한산모시, 중국마, 신합섬 직물 등 총 54종을 사용하였다. 마직물의 주관적 태 평가를 위해 26문항의 형용사쌍으로 구성된 9점의 의미미분척도를 개발하였으며 이 척도를 사용해 주관적 평가를 실시하였다. 또 객관적 평가를 위해 KES-FB 시스템을 통해 역학적 특성치를 구하였다. 주관적 평가를 실시한 결과 마직물의 태에 영향을 미치는 7개의 요인이 추출되었다. 이 요인들은 표면성질, 신축성/드레이프성, 중량감, 강연성, 회복성, 수분특성, 밀도감이었으며, 요인들로 설명되는 누적분산값은 67.18%였다.주관적 평가의 결과와 객관적 평가 결과를 이용해 마직물의 태를 평가하는 산출식을 제시하였다. 태 평가치의 경우 16가지 특성치를 모두 넣는 방법과 stepwise 방법, 또 Kawabatark 사용한 순차적 군 회귀법의 세가지 방법의 회귀식 중 16가지 특성치를 모두 넣는 방법의 결정계수가 가장 높았다.