• Science of Emotion and Sensibility
• /
• v.25 no.4
• /
• pp.119-128
• /
• 2022

This study analyzes the effects of the number of angles and bends on resistance in a conductor-embroidered stitch circuit for efficient power transfer through a conductor of wearable energy harvesting to study changes in power lost through connection with actual solar panels. In this study, the angle of the conductive stitch circuit was designed in units of 30˚, from 30˚ to 180˚, and the resistance was measured using an analog Discovery 2 device. The measured resistance value was analyzed, and in the section of the angle where the resistance value rapidly changes, it was measured again and analyzed in units of 5˚. Following this, from the results of the analysis, the angle at which the tension was applied to the stitch converges was analyzed, and the resistance was measured again by varying the number of bends of the stitch at the given angle. The resistance decreases as the angle of the stitch decreases and the number of bends increases, and the conductor embroidery stitch can reduce the loss of power by 1.61 times relative to general embroidery. These results suggest that the stitching of embroidery has a significant effect on the power transfer in the transmission through the conductors of wearable energy harvesting. These results indicate the need for a follow-up study to develop a conductor circuit design technology that compares and analyzes various types of stitches, such as curved stitches, and the number of conductors, so that wearable energy harvesting can be more efficiently produced and stored.

• Journal of the Mineralogical Society of Korea
• /
• v.22 no.3
• /
• pp.207-216
• /
• 2009

Three distinct types of fluid inclusions in amethyst and quartz crystals are associated with metamorphic events in the Korea Amethyst deposit from Uljin-Gun, Gyeongbuk Province. The amethyst displays bimodal grain size distribution in fine-grained, strain-free equigranular quartz with coarse-grained quartz grains with kink bands and undulose extinction. Type I inclusions are liquid-rich and salinity is 0~7 wt% NaCl and the homogenization temperatures ($T_h$) $91{\sim}231^{\circ}C$ with eutectic temperatures ($T_e$) $-52{\sim}-20^{\circ}C$. Type II inclusions are vapor-rich (80~90 vol%). The salinity and $T_h$ ranges 3~6 wt% NaCl and $230{\sim}278^{\circ}C$, respectively with $T_e$ $-56{\sim}-23^{\circ}C$. Type III inclusions contain a daughter mineral other than NaCl. The salinity ranges 32~36 wt% NaCl and $T_h$ $210{\sim}271^{\circ}C$. The textural and fluid inclusion evidences suggest that the host Buncheon granite gneiss and Amethyst pegmatite experienced dynamic recrystallization and the studied fluid inclusions are metamorphic in origin. The metamorphic event possibly occurred at higher temperature than $271{\sim}278^{\circ}C$. The amethysts from Uljin Korea Amethyst can be distinguished from the synthetic amethyst on basis of the distinctive two and three-phases fluid inclusions. Furthermore, it is noticeable that Korea amethyst do not contain NaCl-bearing and $CO_2$-rich fluid inclusions unlike those compared to those from Eonyang and Samcheonpo deposits related to unmetamorphosed granitic rocks.

• Journal of Astronomy and Space Sciences
• /
• v.11 no.1
• /
• pp.71-80
• /
• 1994

It is generally known that the measurement of the ionospheric total electron content(TEC) by GPS can more accurately monitor the broader area of the ionosphere than other current methods. \Ve measured the TEC along a slant path considering the arrival time differences of P-code which is transmitted from GPS satellites with the modulation on two L-band carrier frequencies, L1 (1574.42MHz) and L2 (1227.60MHz). Under the assumptions that the ionosphere is uniformly distributed and its average height is 350km, we transformed the slant TEC to the vertical TEC at the point that the line-of-sight direction to GPS satellite cut across the average height of the ionosphere. Because there is no dual frequency P-code GPS receiver in Korea, we used the data observed at the TAIW GPS station ($N25^{\circ},E121.5^{\circ}$) in Taiwan which is one of the core stations in International GPS and Geodynamics Services (IGS). The TEC values obtained in this work showed a typical daily variation of the ionosphere which is high in the daytime and low in the nighttime. Our results are found to be consistent with the SOLAR-DAILY data of NOAA and the Klobuchar's model for the ionospheric correction of GPS. In addition, in the cornparision with SOLAR-DAILY data, we estimated the precision of our TEC measurement as 2 TEC.

• The Journal of The Korea Institute of Intelligent Transport Systems
• /
• v.21 no.2
• /
• pp.33-43
• /
• 2022

The number of car crashes increases along with the increasing number of vehicles. Hence, diverse initiatives on traffic accidents have been implemented, targeting zero crash fatalities. According to the 3rd Traffic Safety Master Plan of 2016, the current standard selecting road accident black spots prioritizes locations with the high cumulative death toll. While this standard is suitable for roads that a city government manages to some extent, it is not suitable for roads less than 20 meters that a borough (Gu) handles. The roads under the supervision of a borough do not have enough death toll, and thus improvements on its road accident black spots are highly limited. In addition, discovering the causes of traffic accidents is not easy when the number of car accidents is obtained by considering only fatal accidents, which are relatively low in number. Therefore, including all traffic accidents might identify causes of accidents and result in better advancements. Therefore, this research follows rational decision-making and suggests new National Traffic Safety Master Plan standards. These new standards are obtained by comparing accident costs between the location of fatal crashes and road accident black spots. The analysis result shows that considering all types of accidents yields better results. For example, a Three-way Intersection in front of Zion Day Care Center, one of the selected spots under the current standard, has lower road crash costs than Sinchon Intersection, a selected spot under a new standard. Therefore, the study concludes that the standards to select road accident black spots need to include traffic accident severity and road crash costs.

• Journal of the Korean Crystal Growth and Crystal Technology
• /
• v.18 no.4
• /
• pp.146-154
• /
• 2008

This study was carried out for the purpose of obtaining the basic data for color identification of amethyst by spectrophotometer. For this, the eleven amethyst stone and one citrine stone from eight countries were prepared in facet cut or plate. The transmittance and reflection of this samples were investigated as a function of wavelength. The transmittance or reflection was transformed to tristimulus value (X, Y, Z) and chromaticity value (x, y, z) and then compared with the results of eye observation which was plotted on cm xyY color space. Finally, the influence of the amethyst's thickness on transmittance or reflection was investigated.

• Korean Security Journal
• /
• no.36
• /
• pp.317-347
• /
• 2013

This study focuses on the characteristics of terrorist bombing incidents and causal factors on terrorist bombing incidents and number of casualty per incident in Afghanistan though statistical quantitative analysis. For doing so, the bombing data from GTD(Global Terrorism Database) of START program occurred from January 1st 2002 until December 31st 2011 was used. By using descriptive analysis, chi-square, and logistic regression analysis, characteristics of bombing incidents and causal factors on the frequency of incidents and the number of casualty were identified. According to the analysis results, a clear pattern was appeared in terrorist bombing incidents. This result suggests that terrorists rationally and strategically calculate bombing operations and therefore terrorist bombing incidents and number of casualty per incident are conditioned or affected by time, season, Pashtun tribal entity, production level of drugs, the characteristics of targets.

• Journal of Korean Society of Transportation
• /
• v.32 no.2
• /
• pp.119-129
• /
• 2014

This study aims to evaluate the accident reduction effects of 'Section Speed Enforcement System' (SSES) operation in freeways. In pursuing the above, this study collects the accident data for 5 years (2 years before operation and 3 years after operation) at all 9 sections where SSESs are operated, and evaluates annually the effects before and after operation using the comparison group method (C.G. Method). The measures of effectiveness are total accidents (TAs), fatal and serious accidents (FSAs), total injuries (TIs) and fatal and serious injuries (FSIs). The main results are as follows. First, TAs and TIs are reduced to 41.7 and 17.1%, respectively. Second, FSAs and FSIs are reduced to 41.7 and 32.2%, respectively. Therefore, SSES has more effectiveness at fatal and serious accident. Third, the accident reduction effect has been increasing, and particularly the effect of 'after three years' is evaluated to be notable.

• The Journal of the Korea Contents Association
• /
• v.13 no.12
• /
• pp.439-446
• /
• 2013

The purpose of this study is to analyze the status and the competitiveness improvement of character industry comparing to relative LQ index of the no. of character company, the no. of employee and the amount of revenue of 2007, 2009, and 2010 between including Metro area and regional blocks(kangwon, chungchung, daekung, honam, dongnam and jeju region). The results of this research are as follows. In case whole regional analysis, no. of employee and no. of character company suggested jeju, dongnam and Metro have high competitiveness during the 3 years and amount of revenue suggested consistent high competitiveness 6 block except Metro. But in case of except of Metro, no. of character company and the no. of employee indicated dongnam and jeju showed competitiveness during 3 years. Chungchung area indicated high competitiveness at no. of employee(2009) and no. of character company(2011). The amount of revenue indicated jeju area have high competitiveness during 3 years.

• Proceedings of the Safety Management and Science Conference
• /
• 2012.11a
• /
• pp.415-423
• /
• 2012

고용노동부 산업재해분석 자료에 의하면 최근 5년간 (2006년~2010년)의 총 재해자수(사망자수) 472,329명(11,662명), 경제적 직접손실액 16,814,806백만원, 경제적 손실 추정액(직 간접) 84,074, 030백만원으로 인적 물적 손실이 크다는 것을 알 수 있다. 본 연구에는 산업안전보건법상의 안전관리자 선임된 사업장 211개소 대상으로 안전관리자의 직무특성에 따른 산업안전정책방향 이해도에 관한 조사를 하였다. 연구대상자의 기업체의 특성을 보면 지역별, 업종별, 규모별, 노조설립 여부에 따라 산업안전정책방향에 대한 인식도 차이가 있는 것으로 나타났으며, 연구대상자의 직무특성을 보면 연령, 경력, 근무부서에 따라서도 산업안전정책방향에 대한 이해도 차이가 있다는 것을 알 수 있었다. 본 연구에서는 기업체 산업안전관라자 직무특성에 따른 산업안전정책방향 이해도 분석을 통해 정부의 정책변화, 경영자 안전관리자의 안전의식 변화가 필요할 것으로 사료된다.

• 도로교통
• /
• s.94
• /
• pp.51-64
• /
• 2003

본 연구는 사고요인과 사고모형의 문헌고찰을 통해 고속도로를 주행하는 버스와 화물차의 사고모형을 개발하고 그 적용방안에 대해 고찰하고자 수행되었다. 고속도로 사고 중 대형차로 인한 차량당 사고율은 승용차보다 월등히 높아 사고의 심각성을 나타내고 있으며, 따라서 이에 대한 별도의 검토가 필요한 시점에 와 있다. 특히 본 연구에 활용된 자료는 비집계된 사상자수로 구간자료를 집합화함으로써 발생하는 문제점을 해소할 수 있다. 모형의 분석기법으로 국내의 경우, 대부분 단순회귀식으로 사고모형을 개발, 적용하여 왔으나 사고수와 사상자수의 특성상 이산적 확률변수로 해석하여 포아송분포와 음이항분포로 적용하는 것이 바람직하다. 따라서 본 연구에서는 버스와 화물차의 사고유형별로 적합한 사고 모형을 개발하여 이로 인한 인사사고 요인에 대한 영향을 분석하고 그 적용방안을 제시하였다. 이러한 연구는 도로설계, 운영, 교통법규, 교통행정 등의 분야에서 거시적인 정책적 방향성을 제시하리라 판단된다. 특히 본 연구는 고속도로 운영주체인 한국도로공사의 고속도로사고조서를 바탕으로 사고유형별 사고모형을 개발, 적용한 것으로 고속도로의 안정성 향상을 위한 제반 정책 수립에 기초자료로 활용될 것으로 기대된다.