• Current Photovoltaic Research
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• 제1권1호
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• pp.17-26
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• 2013

In contrast to conventional crystalline cells, back-contact solar cells feature high efficiencies, simpler module assembly, and better aesthetics. The highest commercialized cell and module efficiency was recorded by n-type back-contact solar cells. However, the mainstream PV industry uses a p-type substrate instead of n-type due to the high costs and complexity of the manufacturing processes in the case of the latter. P-type back-contact solar cells such as metal wrap-through and emitter wrap-through, which are inexpensive and compatible with the current PV industry, have consequently been developed. In this paper the characteristics of EWT (emitter wrap-through) solar cells and their status and prospects for development are discussed.

• 임상간호연구
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• 제26권2호
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• pp.232-239
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• 2020

Purpose: This study was an quasi-experimental study to compare the effect of applying polyethylene wrap and aircap in maintaining body temperature of preterm infants. Methods: The participants were 51 preterm infants. Aircap was applied to the experimental group (n=23) and polyethylene wrap was applied to the control group (n=28) when the preterm infants admitted to neonatal intensive care unit. The data was collected at W hospital in J-province from June 2016 to May 2017. A total of 9 body temperature measurements were taken at 3 hours interval from 5 min to 24 hours after admission. Repeated measure ANOVA, independent t-test and χ² test were conducted used with SPSS/WIN 24.0 Results: There were no significant difference in the homogeneity tests for general characteristics and dependent variables prior to the experiments (t=0.57, p=.566). There was a significant difference on body temperature of preterm infants over time (F=3.24, p=.020). There was no significant difference on body temperature between polyethylene wrap and aircap application groups (F=1.29, p=.261). The interaction between the group and the time was insignificant (F=1.51, p=.214). Conclusion: The findings demonstrated that both methods of applying polyethylene wrap and aircap on the body in preterm infants had effect in maintaining body temperature.

• 한국통신학회논문지
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• 제12권3호
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• pp.285-291
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• 1987

Seisimic wave가 지하 내부로 전파되어 갈 때 점차적으로 에너지를 상실함으로써 attenuation현상을 일으킨다. Seismic wave의 velocity를 complex number로 표시하여 실수부는 phase velocity, 허수부는 attenuation 상수로 하여 attenuation특성을 수치적으로 modeling하는 방법을 제시하였다. 이 방법은 주파수와 독립적으로 로그특성으로 감쇄해가는 매질 속에서의 파동의 전파를 modeling한다. 본 연구는 attenuation을 위치함수로 표시하여 순방향 및 역방향 numerical modeling에 응용하여 FFT계산때 발생하는 wrap-arround noise 를 효율적으로 제거함으로써 memory space를 절약하고 computing time을 감소시킬 수 있음을 잘 보여주고 있다.

• Nuclear Engineering and Technology
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• 제36권2호
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• pp.165-174
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• 2004

The distributed resistance model has been recently implemented into the MATRA-LMR code in order to improve its prediction capability over the wire-wrap model for a flow blockage analysis in the LMR. The code capability has been investigated using experimental data observed in the FFM (Fuel Failure Mock-up)-2A and 5B for two typical flow conditions in a blocked channel. The predicted results by the MATRA-LMR with a distributed resistance model agreed well with the experimental data for wire-wrapped subchannels. However, it is suggested that the parameter n in the distributed resistance model needs to be calibrated accurately for a reasonable prediction of the temperature field under a low flow condition. Finally, the analyses of a blockage for the assembly of the KALIMER design are performed. Satisfactory results by the MATRA-LMR code were obtained through and rerified a comparison with results of the SABRE code.

• Ocean Systems Engineering
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• 제12권4호
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• pp.413-437
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• 2022

An innovative concept for wet-transportation and stepwise installation of mono-bucket foundation for 15 MW offshore wind turbine is proposed. Case studies for two different mono-bucket and wrap-buoy dimensions are conducted and their hydrostatic and hydrodynamic performances are compared for both wet-towing and lowering operations. The intact stability and transient responses are analyzed in detail for various stages of lowering operation. Wave-induced motion statistics during wet tow in sea state 4 (highest operational window) are checked. The proposed concept is found to be feasible and can be an alternative cost-effective solution without using heavy-lift crane vessel in practice.

• Archives of Reconstructive Microsurgery
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• 제3권1호
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• pp.72-80
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• 1994

저자들은 수무지 절단 및 연부조직 결손을 주소로 고려대학병원 정형외과로 내원한 환자들을 대상으로 30례의 족무지 유리피부편을 이용한 수무지 재건술을 시행하고 비교적 장기간의 추시 관찰을 시행한 바 다음과 같은 결과를 얻었다. 1. 총 30례중 1례를 제외한 29례에서 이식이 성공하였으며 미용적 측면과 기능적인 면에서 모두 우수한 결과를 얻을 수 있었다. 2. 합병증으로 1례에서 이식실패, 6례에서 부분피부괴사, 1례에서 부정유합, 15례에서 이식골의 흡수가 있었으며 그중 1례에서 피로 골절이 관찰되었다. 3. 제1수장골 경부 절단시에도 수무지의 재건이 가능하였으나 무지 운동성의 제한과 많은 이식골의 골흡수가 문제점으로 제시되었다. 이상에서 족무지 유리 피부편을 이용한 수무지 재건술은 수무지 절단환자에 있어 미용상 및 기능적인 면에 있어 우수하며 공여부에도 비교적 결손이 적은 추천할 만한 수술법으로 사료되며 또한 술자는 합병증의 방지를 위하여 세심한 주의를 기울여야 할 것이며 미세수술수기에도 숙달되어야 할 것이다.

• Archives of Reconstructive Microsurgery
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• 제18권2호
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• pp.62-66
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• 2009

Purpose: Despite the free tissue transfer using microsurgical technique being the current trend of soft tissue reconstruction of the hand, the pedicled groin flap has the advantage to provide coverage for the mangled hand without necessitating the use of a damaged arterial system and also providing the benefit of saving the arterial system for later free tissue transfer. This report presents the author's experience using pedicled groin flap in four cases of mangled hands with massive bone and soft tissue defects requiring later thumb reconstruction with the free wrap around flap. Materials and methods: The patients' age ranged from 30 to 51 years; three patients were male and one was female. The causes of mangled hand included two machinery crush injuries, one laboratory explosion and one motor vehicle accident. While evaluating the post-operative results, factors like flap survival, complications, stability in opposition, pinch power and 2 point discrimination were taken into account. Results: All massive soft tissue defects of the hands were completely covered with pedicled groin flap successfully. The reconstructed thumb using free wrap around flap did not have any limitation in opposition. There was no occurrence of post-operative infection and all the flaps survived completely. The average pinch power was 70% of the contralateral intact thumb and average 2 point discrimination was 10 mm. Conclusion: The pedicled groin flap for the reconstruction of the massive soft tissue defects of the hand with subsequent reconstruction of the thumb with a wrap around flap is a very useful procedure. The combined use of pedicled groin flap and wrap around flap allows adequate coverage of sizable soft tissue defects and functional thumb opposition in cases of reconstruction of the mangled hands.

• 공업화학
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• 제16권6호
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• pp.800-808
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• 2005

미생물에 의해 분해되는 랩제조용 복합수지를 개발하고, 이에 대한 제조과정과 물성에 대하여 연구하였다. 이런 목적을 위해 원재료 수지, 산화제, 활제의 종류와 사용량 등 같은 몇 가지 조건을 최적화하였다. 생분해성 랩을 제조하기 위한 복합수지는 polyester 계열에서 PBAS (아디프산, 숙신산 및 1.4-부탄디올의 3성분 공중합체)와 PBAST (숙진산, 아디프산, 디메틸테레프탈레이트 및 1.4-부탄디올의 4성분 공중합체)를 이용하였다. 또한 PBAS에서는 1차 산화방지제로는 Irganox 1010과 1076 (0.1 phrs), 2차 산화방지제로는 Irgafos TNPP (0.2 phrs), PBAST에서는 1차 산화방지제로 Irganox 1076 (0.1 phrs), 2차 산화방지제로 Mark PEP 36 (0.3 phrs)이 가장 좋았다. 수지의 가공성 향상을 위해서 사용하는 활제로는 PBAS에서는 glycerol monostearate, PBAST에서는 palmityl alcohol를 각각 0.8%와 1.0%를 사용하면 충분하였다. 제조된 랩의 안정성은 중금속 용출실험과 UTM을 이용한 인장강도 및 신축률을 측정하여 평가하였다. 시제품에 대한 분해률을 측정하기 위해서 동일 조건의 토양에 매립하여 시간경과에 따른 분해정도를 비교한 결과 40일 정도가 경과하면 약 60%가 분해하는 것으로 나타났다.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2006년도 추계학술대회 논문집
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• pp.329-330
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• 2006

• 대한미세수술학회:학술대회논문집
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• 대한미세수술학회 1995년도 제15차 학술대회
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• pp.68.1-68.1
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• 1995