• 한국안전학회지
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• 제34권6호
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• pp.88-95
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• 2019

It has been only a few years since drones have been introduced to Korea, and as the use of drones has increased in industrial sites as well as in hobby activities, accidents such as workers' body parts coming into contact with rotating propellers have been occurring since 2016. Industrial accident cases are being filed. In the case of a remote control vehicle, if you release the remote controller in the event of an abnormal situation, it stops in place and no further danger occurs but in case of drones flying over the sky is different. Sudden motor stops during flight, uncontrolled changes in flight posture, loss of radio waves, loose propeller, etc, numerous factors can lead to accidents due to unintentional movements. Therefore, drone operators need safety knowledge as well as high knowledge about drones. However, drones with a weight of less than 12 kg can fly without a pilot's certification, and therefore, a minimum accident prevention measure is required. 10 accidents approved as industrial accidents since 2016, 23 accidents surveyed by general drone operator, 40 accidents surveyed by the Korean Consumer Resources Unfortunately for the purpose of writing this paper, drones are a new species and do not have many parameters for analysis but my experience has shown that the type of disaster does not deviate significantly. In addition, there is no paper that analyzes drone related industrial accidents not only in Korea but also in other countries. However, even if you watch an overseas drone accident video through YouTube, it is not much different from the case that occurs in Korea. I hope that this study will be of little help to all the drone pilots as well as the work safety of industrial drones used in industrial sites.

• 한국가스학회지
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• 제13권6호
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• pp.29-33
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• 2009

본 연구에서는 Al6061-T6 소재의 알루미늄 라이너와 탄소섬유-에폭시 및 유리섬유-에폭시 복합 소재를 적층으로 감아서 제조한 복합소재 연료탱크에 대한 강도안전성을 유한요소법(FEM)으로 해석하였다. 복합소재 연료탱크는 내구성 향상을 위해 자긴공정(autofrettage process)으로 제조한 다음에 압축천연가스를 공급하였다. 자긴공정을 거친 가스탱크의 응력안전에 대한 FEM 해석결과는 미국의 DOT-CFFC와 한국의 KS 설계안전 평가기준과 비교 평가하였다. FEM 계산결과에 의하면, 자긴공정을 거친 연료탱크의 응력강도는 돔 지역에서 약간 불안정한 것으로 나타났고, 몸체의 평행부에서는 비교적 균일한 안정성을 보여주고 있다. 자긴공정을 거친 복합소재 연료탱크의 평행부에서 관찰된 강도안전성 데이터는 평가기준 데이터로 제공된다. 9.2리터의 복합소재 연료탱크의 응력강도 안전성에 대한 계산결과에 따르면, 미국의 DOT-CFFC와 한국의 KS 평가기준치를 모두 만족하는 것으로 나타났기 때문에 안전한 설계라 할 수 있다.

• 대한교통학회지
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• 제30권2호
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• pp.127-136
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• 2012

다중추돌사고의 형태는 연쇄 추돌이라고 불리우는 뒤로부터의 순차적인 추돌과 앞으로부터의 순차적인 추돌, 그리고 순서가 섞여 있는 추돌형태로 구분된다. 다중추돌사고에 대하여 몇가지 효과적인 재구성 해석 방안을 제시한다. 브레이크 다이브 등으로 인한 차량 파손과 승객 부상을 활용하는 전통적인 경험적 수법과 강체역학 범주내에서의 이론적인 해석 결과를 구하여 당장에의 실용적인 적용이 가능하도록 하였다. 국내에 보급이 확산되고 있는 영상사고기록장치를 활용하고 시뮬레이션 프로그램 등을 병행 활용하여 다중추돌사고를 효과적으로 해석하는 방안을 제시하였다. 저장 동영상에 대한 단순 직관적인 조사를 넘어설 수 있도록 동영상 분석 결과에 근거한 시뮬레이션 해석을 수행하여 다중추돌사고에 대한 구체적이고 다양한 정보의 획득을 가능하게 하여 원인 규명 및 책임 소재 등을 명확하게 구분할 수 있도록 하였다.

• 동의신경정신과학회지
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• 제28권2호
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• pp.123-136
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• 2017

Objectives: The objective of this study is to investigate the anti-amnesic effects of AR, Aucklandiae Radix, ground powder on scopolamine (Sco)-induced memory impairment in mice (C57BL/6) through its favorable acetylcholine (ACh) and acetylcholinesterase (AChE) activity, Choline acetyltransferase (ChAT) mRNA expression, and antioxidant effect. Methods: Six groups, a total of 20 intact or 100 Sco treated mice, were selected based on their body weights and were used in this study. Half of the mice in each group were used for the passive avoidance task test and the measurements of hippocampus ACh content, AChE activity and ChAT mRNA expression. The remaining half of the mice in each group were used for the Morris water maze test and cerebral antioxidant defense system measurement. Results: Marked decreases in step-through latency times in the passive avoidance task test and increases in escape latency times in the Morris water maze test were observed with decreases in the hippocampus ACh content and ChAT mRNA expression, and increases in the hippocampal AChE activities, as a result of Sco intraperitoneal treatment, in the present study. In addition, destruction of the cerebral cortex antioxidant defense systems was observed in Sco control mice as compared with intact vehicle control mice. However, 28 days of continuous oral pre-treatment with AR ground powder at doses of 400, 200 and 100 mg/kg markedly and dose-dependently inhibited the Sco treatment-related amnesia. Conclusions: The results prove that oral administration of AR ground powder reduces Sco-induced memory impairment. This is because it can preserve ACh, related to ChAT mRNA expression, cause AChE inhibition, and activate the cerebral antioxidant defense system.

• 국제물리치료학회지
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• 제9권4호
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• pp.1683-1686
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• 2018

Low back pain (LBP) is the most common reason for seeking physical therapy (PT) care. Recent studies suggest that axial loading can have a positive impact on the intervertebral disc by improving its tensile strength. Further, whole body vibration (WBV) appears to improve spinal muscle relaxation. Therefore, this case study describes the use of axial loading using a mini-trampoline in a female with chronic LBP. This case report is a single subject design. This patient is a 29-year-old female with a six-month history of low back pain following a motor vehicle accident. MRI found herniated discs at L4 and L5, clinical tests were positive for pain in the L4 and L5 dermatome and myotome the slump test was positive for neural tension, and LBP was constant at 4-6/10 over the past four months. She received axial loading exercises using a mini-trampoline and performed six sessions that were, scheduled twice a week for three weeks. Her Oswestry Disability Index (ODI) score improved from 40% at the time of her first visit to 22% at her final visit. Pain measure on the Numeric Pain Rating Scale (NPRS) after the first treatment was 7/10, and her pain after the final treatment was 0/10. These changes in the pain scores are clinically significant and exceed the minimal clinically important difference (MCID). This patient had a significant improvement in her pain using the NPRS and the ODI. This case study suggests that axial loading may be an effective treatment for some individuals with discogenic chronic low back pain.

• 고려인삼학회:학술대회논문집
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• 고려인삼학회 2002년도 학술대회지
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• pp.385-391
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• 2002

Panax ginseng (family- Araliaceae) is a native plant of Korea and has been used for past several years among oriental people. To evaluate the radioprotective potential of P. ginseng on the formation of giant cells in the testis of Swiss albino mice, the animals were divided into four groups: -(I)-Only vehicle was administered. (II)P. ginseng treated group: -The animals received 10 mg/kg body weight P. ginseng root extract (in DDW) i.p. continuously for 30 days. (III) Irradiated group: -The animals were exposed to 8 Gy gamma radiation at the dose rate of 1.69 Gy/min at the distance of 80 ems. (IV) Combined treatment group: -Animals were given P. ginseng extract for four days and on fourth day they were irradiated to 8 Gy gamma radiation after 30 minute of extract administration. The animals of these three groups were autopsied on day 1,3, 7, 14 and 30 days. In ginseng treated group, active spermatogenesis was observed without any toxic effect. Histopathological studies of irradiated group (II) revealed reduction in germ cell count, loss of sperms and formation of multinucleated giant cells on day 7th. These giant cells were formed by round nuclei of early or late spermatids. In combination group (III), although germinal epithelium was still disorganized with loss of cells in few tubules, but no giant cell formation was observed. In order to know the mechanism of radioprotection of ginseng, LPO and GSH were estimated. It was observed that pretreated irradiated animals showed inhibition of LPO and increase in GSH. Thus the present study suggests ginseng protects male gonads. This may be attributed to the inhibition of LPO and increase synthesis of GSH byginseng.

• Journal of Ginseng Research
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• 제37권4호
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• pp.435-441
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• 2013

This study investigated the effects of Korean Red Ginseng (KRG) on radiation-induced bone loss in C3H/HeN mice. C3H/HeN mice were divided into sham and irradiation (3 Gy, gamma-ray) groups. The irradiated mice were treated for 12 wk with vehicle, KRG (per os, p.o.) or KRG (intraperitoneal). Serum alkaline phosphatase (ALP), tartrate-resistant acid phosphatase, estradiol level, and biomechanical properties were measured. Tibiae were analyzed using micro-computed tomography. Treatment of KRG (p.o., 250 mg/kg of body weight/d) significantly preserved trabecular bone volume, trabecular number, structure model index, and bone mineral density of proximal tibia metaphysic, but did not alter the uterus weight of the mice. Serum ALP level was slightly reduced by KRG treatment. However, grip strength, mechanical property, and cortical bone architecture did not differ among the experimental groups. The results indicate that KRG can prevent radiation-induced bone loss in mice.

• 대한한방부인과학회지
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• 제28권3호
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• pp.54-73
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• 2015

Objectives The object of this study was to evaluate the effect of Yikgeebohyul-tang aqueous extracts (YKBHT) on the propylthiouracil (PTU)-induced rat hypothyroidism. Methods The rats were divided into 6 groups : intact vehicle control, PTU control, LT4, YKBHT 500, 250 and 125 mg/kg treated groups. Hypothyroidism was induced by daily subcutaneous treatment of PTU 10 mg/kg for 28 days. YKBHT aqueous extracts were administered once a day as an oral dose of 500, 250 and 125 mg/kg for 42 days. The changes were observed : weight of body, thyroid gland, liver, testis, epididymis and prostate, serum thyroid hormone levels, serum male sex hormone levels, serum lipid profiles, liver and testis antioxidant system. These results were compared with LT4 0.5 mg/kg intraperitoneally treated rats. Results These PTU induced hypothyroidism and related hepatic and male reproductive organ damages were favorably and dose-dependently inhibited by treatment of YKBHT 500, 250 and 125 mg/kg, and YKBHT also effectively regulated the PTU-induced abnormal antioxidant defense factor changes in the both liver and testis. Although, LT4 also inhibited PTU-induced hypothyroidism and relative liver damages. But it deteriorated the hypothyroidism related testis, epididymis and prostate damages through testicular oxidative damages. Conclusions : The result of this study suggests that YKBHT has favorable effects on the hypothyroidism and related liver and reproductive organ damages with augmentation of antioxidant defense factor in the testis and liver. YKBHT 500, 250 and 125 mg/kg dose-dependently inhibited PTU-induced hypothyroidism and related liver and male reproductive organ damages in rats.

• 비교문화연구
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• 제21권
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• pp.113-138
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• 2010

This writing verifies ideology producing unethical stratification or discrimination targeting on Grandeur's TV commercial after 2008. And attempts to point out the utopia desired by those commercials reproduces distorted ideology at Korean society. To achieve this, the analysis model was postulated utilizing narratology and semiotics system in application of methodology. The result of discussion, is that the 2008 'Grandeur New Luxury' commercial can have utilized the inflected patriotism and sexual fantasies as the core strategy of storytelling. The fact trebly othering women's body from the point of view of gender ethics can be pointed out as the biggest problem in this commercial. 2009 'Grandeur New Luxury' frankly stimulates costumer's desire of stratum rise and possessiveness, circulating the logic 'owning a vehicle' is a proof of their existence. Also considering the meaning woman narration takes up in corresponding commercial, criticism utilizing feminine signifier as a tool to reinforce male success legend was available. Finally 2010 'The Luxury Grandeur' commercial was able to make a judgement using the mechanism of present consumption culture cleverly which Baudrilliard and Althusser has critically recognized. Because commercial images precisely utilizes the mistake called the 'phantasme-$m{\acute{e}}connaissance$' or the 'reconnaissance-$m{\acute{e}}connaissance$' that consumers easily make. Reminding TV commercials exerts control power against unspecified many sitting in front of the TV, continuous studies with same interest are needed in the future. This writing will be able to have a meaning as attempting narratological methodology for analyzing the storytelling of car TV commercials. But systemizing the criticism about the commercial as a single narrative with going through theoretical supplementation is being respected in the future.

• Journal of Biomedical and Translational Research
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• 제19권4호
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• pp.73-78
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• 2018

Osteoporosis is a major worldwide public health problem that poses a great economic burden to society. Puerariae Radix, the dried root of Pueraria lobata (Wild.) Ohwi, has been widely used in Asia. This study investigated the effects of Puerariae Radix (PR) on bone loss in ovariectomized (OVX) mice. C3H/HeN mice (10 weeks old) were divided into sham and OVX groups. The OVX mice were treated with vehicle, $17{\beta}-estradiol$ ($E_2$), PR (oral administration, 250 mg/kg/day) or PR (intraperitoneal administration, 50 mg/kg/every other day) for 6 weeks. Grip strength, uterus weight, serum alkaline phosphatase (ALP), estradiol concentration and osteoclast surface levels were measured. Tibiae were analyzed using microcomputed tomography. There were no significant differences in the degree of grip strength, body weight and uterine weight between OVX group and PR-treated group. As compared with the OVX group, the serum estradiol levels were significantly increased in the PR-treated group. PR (i.p.) significantly preserved trabecular bone volume, trabecular bone number, structure model index and bone mineral density of proximal tibiae metaphysic. The administration of PR lowered serum ALP and osteoclast surface levels in OVX mice, suggesting that PR can reduce the bone turnover rate in mice. The results indicate that the supply of PR can prevent OVX-induced bone loss in mice.