• 전기산업
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• v.7 no.1
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• pp.114-118
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• 1996

• Proceedings of the KIEE Conference
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• 1999.11d
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• pp.1028-1030
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• 1999

전 세계적으로 송전 용량의 증대 요구에 따라 송전 시스템이 초고압화 되어 가고 있으며 환경친화성 및 여러 특성에 있어 OF(Oii filled) 케이블에 비하여 우수한 성능을 지닌 XLPE(Crosslinked Polyethylene) 케이블의 사용이 급속하게 증가하고 있는 추세이다. 최근 345kV급 이상의 XLPE 케이블 시스템 개발이 해외 선진업체들에 의해 활발히 진행되고 있으며 이의 평가를 해외공인 인증기관에서 수행하여 개발된 제품의 디자인 검증 및 장기간 신뢰성을 입증하고 있다. 이러한 추세에 맞추어 LG 전선은 400kV 케이블 및 접속함의 사내 개발시험후 해외공인 인증기관인 네덜란드의 KEMA에서 IEC 62067에 따른 인증시험을 완료하여 개발된 제품의 높은 신뢰성을 인증 받았으며, 자사의 초고압 기술을 한 단계 상승시켜 세계 선진업체들과 경쟁할 수 있는 발판을 마련하였다.

• Proceedings of the KIEE Conference
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• 2001.11b
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• pp.176-178
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• 2001

This paper presents the application draft of ancillary services for Korean Wholesale Electricity Market. This application draft of ancillary services is based on technical rules for ancillary services agreements prepared by KEMA and the present conditions of KEPCO system operations and future directions.

• Journal of The Korean Society of Integrative Medicine
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• v.4 no.4
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• pp.101-108
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• 2016

Purpose : The purpose of this study was to determine the effect of selective thoracic extensor strengthening exercises in the sitting position using a foam-roller by investigating the electromyographic(EMG) activities of the thoracic and lumbar extensors. Methods : Eighteen healthy subjects with no medical history of back pain were recruited. EMG activity was recorded from thoracic extensor(TE) and lumbar extensor(LE) while subjects performed three thoracic extension exercises: prone thoracic extension(PTE), prone thoracic extension with abdominal draw-in maneuver(PTE-ADIM), and sitting thoracic extension using a foam-roller(STE). TE and LE EMG activity, and TE/LE EMG activity ratio were analyzed by one-way repeated-measures analysis of variance(ANOVA). Where a significant difference was identified, a Bonferroni correction was performed(p<.017, .05/3). Results : TE and LE EMG activity, and TE/LE EMG activity ratio differed significantly among the three exercises(p<.05). Post hoc pair-wise comparison with Bonferroni correction showed that TE muscle activity in the STE exercise was significantly different from PTE and PTE-ADIM exercises(p<.017). There was no significant difference between TE muscle activity for PTE and PTE-ADIM exercises(p>.017). LE muscle activity and TE/LE ratios were significantly different among the three exercises p<.017). Conclusion : TE/LE ratio showed superior selective thoracic extensor strengthening for the STE exercise than PTE and PTE-ADIM exercises. Therefore, we recommend STE exercise for selective thoracic extensor strengthening.

• Journal of The Korean Society of Integrative Medicine
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• v.11 no.1
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• pp.79-86
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• 2023

Purpose : Aging is reflected on the face of women due to the depletion of collagen and hydration in the facial skin overtime. This study investigated the effect of multiple SONO^® ultrasound for a 4-week period on the skin health by measuring the skin elasticity and deeper skin elasticity in the tested women subjects. Methods : Twenty healthy women were recruited for this experiment. All the participants applied multiple ultrasound device (SONO^®) during this experiment. The SONO^® device was set to ANTI-AGING function and five power steps such as 1, 3, 10 and 17 MHz were used during this experiment, and directly contacted with the facial skin. Specifically, the probe was contacted with the entire face except for the nose and eyes for 10 min on each side of the face every day and repeated for 4 weeks. The skin elasticity and the elasticity of deeper skin were measured at three times (0, 2, 4 weeks) using a Ballistometer and dermal torque meter, respectively. The one way repeated ANOVA was used to compare the skin elasticity and the elasticity of deeper skin among three times (0, 2, 4 weeks). Results : The skin elasticity (p<.05) and elasticity of deeper skin (p<.05) were significantly increased at 2 weeks and 4 weeks of intervention compared to that at 0 weeks. For the skin elasticity, there was no significant difference between 2 and 4 weeks of intervention (p>.05). For the elasticity of deeper skin, it increased significantly at 4 weeks compared to 2 weeks of intervention (p<.05). Conclusion : These findings suggest that applying multiple SONO^® ultrasound to the facial skin of healthy women for 4 weeks, can increase the skin elasticity and elasticity of deeper skin by supporting epidermal hydration and dermal collagen production.

• International Journal of Internet, Broadcasting and Communication
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• v.12 no.4
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• pp.173-179
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• 2020

In this study, we present the difference in thoracic reposition sense in young people (24.00 ±2.20 years old) with and without habitual slouched posture in two target positions of half flexion and half extension. People with habitual slouched posture (n = 20; 11 men and 9 women) and people without slouched posture (n = 20; 10 men and 10 women) were recruited from three universities. Thoracic spine (T-spine) repositioning errors were measured in two target positions (half flexion and half extension). People with habitual slouched posture showed significantly higher thoracic repositioning error in the extension target position than did people without slouched posture (P<0.05). There was no difference in repositioning error in the flexion target position between the two groups (P>0.05). In conclusion, people with habitual slouched posture show lower T-spine repositioning sense in extension than do people without slouched posture. A rehabilitation program to treat habitual slouched posture, such as postural correction education, should be implemented for individuals with decreased position sense of the T-spine.

• Proceedings of the KIEE Conference
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• 2001.11b
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• pp.182-184
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• 2001

This paper presents the application draft of system frequency and reserve criteria for Korean Wholesale Electricity Market. This application draft of system frequency and reserve criteria is based on frequecy, voltage control rules and technical rules for ancillary services agreements prepared by KEMA and the present conditions of KEPCO system operations and future directions.

• Proceedings of the KIEE Conference
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• 2003.11a
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• pp.460-462
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• 2003

One of many elements considered important is TR-Cost in restructed electrical power market. KEMA supposed the TR-Cost system which involved an allocation rate of groups of generator and load as 5 to 5 but it isn't based on electrical and economic theory. Also there is a defect that we cann't calculate each allocation to numerous members forming the group of generators and loads. Therefore, in this paper, we propose an allocation method by using "generator forcused TR MLF" & "load forcused TR MLF" in consideration of economic signal.

• Proceedings of the KIEE Conference
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• 2007.07a
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• pp.619-620
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• 2007

본 논문에서는 초고압 케이블용 중간접속재의 하나인 프리몰드형 직선접속재의 기본 설계를 바탕으로 당사에서 지난 2006년 네덜란드 KEMA에서 IEC 62067 규격에 맞는 접속재를 개발하여 신뢰성 인증을 받았다. 그 접속재에 저유전율을 갖는 실리콘 고무를 적용했을 때의 전계집중지역의 전계를 완화시키는 방안을 고안하였다. 프리몰드형 직선접속재의 소형화를 위해 고유전율 실리콘 고무와 저유전율 실리콘를 적용하였다. 실제 제품을 생산에 앞서 전계해석 시뮬레이션을 통해 프리몰드형 직선 접속재의 소형화 가능성을 예측해 본다.

• Proceedings of the KIEE Conference
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• 2007.07a
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• pp.489-490
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• 2007

In order to construct a digital substation based on IEC61850, All of the utility company should used IEDs to be verified and also vendors should get a certification from the international conformance testing organizationsuch as KEMA. So KEPRI in charge of POWER IT project related to SAS was required to IED conformance testing system, which can perform the test previously. The system, KEPCO developed, consists of HMI, IED (Intelligent Electronic Device), network equipment, V/I generator etc