• 복식
• /
• 제56권8호
• /
• pp.15-34
• /
• 2006

Knit wear was industrialized, diversified, specialized and was made into high-class and it is including knitted cloth and small product for fashion as well as cardigan, sweater, and jacket etc. unlike past recognition only with underwear and inner wear. To consider elasticity to be the best strength of knit wear, middle-aged women that form change is serious are wearing knit wear as clothes for going out, and this may be regarded as clothes action to be conscious of form than vogue. Thus, in this study, this researcher tried to suggest solution scheme through the development of design of knit wear to supplement the form defect of middle-aged women. This researcher tried to develop the design of knit wear to supplement the form defect of middle-aged women, after examining the theoretical background of knit wear, the bodily and mental feature of middle-aged women. Internal and external knit wear brand that middle-aged women prefer as the scheme for solving the problematic form of middle-aged women with knit wear. As the result first, to see the present situation of inland production enterprise of knit wear, almost all the brand companies are concentrating energies on widening age class. Second, middle-aged women become far off from the form which is regarded ideal form in modern society. Third, result that this researcher examined the brand of knit wear of middle-aged women is as follows : MORADO, Cartknit, Escalier. And, in foreign knit wear brand, ST John, Missoni, ESCADA. Fourth, as the result that this researcher did work manufacture for the supplement of form defect of middle-aged women, it has practical and active side, and off-time has high-class and elegant refined beauty.

• 터널과지하공간
• /
• 제11권2호
• /
• pp.132-145
• /
• 2001

핵변환 후 영구 처분될 가압경수로 및 중수로용 사용후 핵연료에 대한 인간 생태계에 대한 영향을, 직접 처분하는 경우와 비교해 보았다. 심지층 처분된 용기에 저장된 사용후 핵연료로부터 유출된 방사성 핵종들이 공학적 방벽을거쳐 결정질 기반암 내 균열대를 통해 지하수의 흐름을 따라 이동하면서, 다양한 지질 및 암종을 거쳐 생태 환경으로 도달한다는 핵종 유출 시나리오 중 가장 보수적인 시나리오인 우물 시나리오에 대한 위해도를 평가하여 상대인 환경친화성을 정량적으로 제시하였다. 현재 국내에 가속기와 미임계형 원자로를 함께 사용하는 핵변환 시스템과 임계형 원자로와 같은 핵변환시스템이 개념적인 수준에서 개발되고 있어, 이 연구를 통해 향후 핵변환시스템 연구에서 요구되는 항목들도 기술적 개선, 경제성 제고, 환경 친화성, 그리고 수용성 측면에서 제시해 보았다.

• 한국항해항만학회지
• /
• 제37권5호
• /
• pp.493-498
• /
• 2013

본 연구는 퍼지 TOPSIS법과 AHP법을 이용하여 IMO 정보관리시스템의 예비과제 우선순위를 평가하기 위한 것이다. 이러한 평가를 위해 먼저 24개의 예비과제를 추출하여 FSM법을 이용하여 대체안을 구조화하였고, 최종 4개의 주요 예비과제를 도출한다. 또한 평가항목간의 가중치는 의사결정자의 일관성을 유지하면서 평가가 가능한 AHP법을 이용한다. 그러나 AHP법은 비교대상의 수가 증가하면 쌍대비교의 횟수가 증가하고, 평가에는 수많은 애매성이 존재하기 때문에 최종 우선순위 선정에는 TOPSIS에 퍼지이론을 도입한 퍼지 TOPSIS법을 이용한다. 그 결과 IMO 기준정보관리, IMO 정보기준전달, IMO 통합데이터베이스, IMO 지식허브 순으로 구축되어야 하는 것으로 나타났다.

• Journal of Power Electronics
• /
• 제13권4호
• /
• pp.626-635
• /
• 2013

An analysis of the junction capacitance in resonant rectifiers which has a significant impact on the operating point of resonance circuits is studied in this paper, where the junction capacitance of the rectifier diode is to decrease the resonant current and output voltage in the circuit when compared with that in an ideal rectifier diode. This can be represented by a simplified series resonant equivalent circuit and a voltage transfer function versus the normalized operating frequency at varied values of the resonant capacitor. A low voltage to high voltage push-pull DC/DC resonant converter was used as a design example. The design procedure is based on the principle of the half bridge class-DE resonant rectifier, which ensures more accurate results. The proposed scheme provides a more systematic and feasible solution than the conventional resonant push-pull DC/DC converter analysis methodology. To increase circuit efficiency, the main switches and the rectifier diodes can be operated under the zero-voltage and zero-current switching conditions, respectively. In order to achieve this objective, the parameters of the DC/DC converter need to be designed properly. The details of the analysis and design of this DC/DC converter's components are described. A prototype was constructed with a 62-88 kHz variable switching frequency, a 12 $V_{DC}$ input voltage, a 380 $V_{DC}$ output voltage, and a rated output power of 150 W. The validity of this approach was confirmed by simulation and experimental results.

• Ocean and Polar Research
• /
• 제30권2호
• /
• pp.129-140
• /
• 2008

As a preliminary effort to establish a data assimilative ocean forecasting system, we reviewed the theory of the Ensemble Kamlan Filter (EnKF) and developed practical techniques to apply the EnKF algorithm in a real ocean circulation modeling system. To verify the performance of the developed EnKF algorithm, a wind-driven double gyre was established in a rectangular ocean using the Regional Ocean Modeling System (ROMS) and the EnKF algorithm was implemented. In the ideal ocean, sea surface temperature and sea surface height were assimilated. The results showed that the multivariate background error covariance is useful in the EnKF system. We also tested the sensitivity of the EnKF algorithm to the localization and inflation of the background error covariance and the number of ensemble members. In the sensitivity tests, the ensemble spread as well as the root-mean square (RMS) error of the ensemble mean was assessed. The EnKF produces the optimal solution as the ensemble spread approaches the RMS error of the ensemble mean because the ensembles are well distributed so that they may include the true state. The localization and inflation of the background error covariance increased the ensemble spread while building up well-distributed ensembles. Without the localization of the background error covariance, the ensemble spread tended to decrease continuously over time. In addition, the ensemble spread is proportional to the number of ensemble members. However, it is difficult to increase the ensemble members because of the computational cost.

• Composites Research
• /
• 제28권2호
• /
• pp.70-74
• /
• 2015

본 논문에서는 탄소나노튜브(CNT)와 마이크로 글래스 버블(GB)을 포함한 폴리아마이드 6(PA6) 복합재의 열전 특성을 다뤘다. 복합재에 포함된 GB은 복합재 내에서 큰 공간을 차지하게 되는데, 이때 CNT는 GB가 없는 공간으로 밀려나면서 고밀도로 격리된(segregated) 네트워크를 형성한다. CNT의 분산을 위해, 소니케이션(Sonicatoin)으로 CNT를 분산시킨 PA6, 포름산 용액을 증류수를 이용하여 응고시킨 후 압축성형하여 복합재 판을 제조하였다. 복합재 판의 열전성능을 평가하기 위해서 열전도도, 전기전도도, 제벡계수(Seebeck coefficient) 등을 측정하였고, 최고 0.016의 성능지수를 얻었다.

• 공업화학
• /
• 제10권6호
• /
• pp.939-943
• /
• 1999

최근에 생분해성 고분자를 이용한 의료용재료로의 응용에 대한 관심이 고조되고 있다. 본 연구에서는 천연고분자(xanthan, locust bean, guar gum, chitosan 및 algin)를 생체재료로 사용할 목적으로 용액주조법에 의하여 분해성 필름을 제조하였다. 천연고분자로부터 제조한 생체재료의 가능성을 피부이식제로서 생체적합성 측정에 의하여 평가하였다. 이들을 실험동물의 등부위에 피하 삽입하여 필름의 시간에 따른 구조적, 중량적변화와 랫드의 혈액학적 변화를 측정하여 생체적합성을 연구하였다. 랫드에 대한 테스트결과 locust bean과 guar gum은 삽입 24시간, 48시간 후 조직에서의 생체 이물 반응에 의한 생체 부적합성을 나타내었으며, 일부 천연고분자로부터 제조한 분해성 필름은 단기간의 이상적인 생체재료로서의 가능성을 나타내었다.

• 한국정밀공학회지
• /
• 제24권4호
• /
• pp.138-146
• /
• 2007

Some biodegradable polymers and other materials such as hydrogels have shown the promising potential for surgical applications. Post surgical adhesion caused by the natural consequence of surgical wound healing results in repeated surgery and harmful effects. Recently, scientists have developed absorbable anti-adhesion barriers that can protect a tissue from adhesion in case they are in use; however, they are dissolved when no longer needed. Although these approaches have been attempted to fulfill the criteria for adhesion prevention, none can perfectly prevent adhesions in all situations. Overall, we developed a new method to fabricate an anti-adhesion membrane using biodegradable polymer and hydrogel. It employed a highly accurate three-dimensional positioning system with pressure-controlled syringe to deposit biopolymer solution. The pressure-activated microsyringe was equipped with fine-bore nozzles of various inner-diameters. This process allowed that inner and outer shapes could be controlled arbitrarily when it was applied to a surgical region with arbitrary shapes. In order to fulfill the properties of the ideal barriers f3r preventing postoperative adhesion, we adopted the pre-mentioned method combined with surface modification with the hydrogel coating by which anti-adhesion property was improved.

• 대한수의학회지
• /
• 제32권4호
• /
• pp.543-553
• /
• 1992

Properties of unitary ATP-sensitive $K^+$ channels were studied using planar lipid bilayer technique. Vesicles were prepared from bullfrog (Rana catesbeiana) skeletal muscle. ATP-sensitive $K^+$ (K (ATP)) channels were identified by their unitary conductance and sensitivity to ATP. In the symmetrical solution containing 200mM KCI, 10mM Hepes, 1mM EGTA and pH 7.2, single K (ATP) channels showed a linear current-voltage relations with slight inward rectification. Slope conductance at reversal potential was $60.1{\pm}0.43$ pS(n=3)). Micromolar ATP reversibly inhibited the channel activity when applied to the cytoplasmic side. In the range of -50~＋50 mV, the channel activity was not voltage-dependent, but the channel gating within a burst was more frequent at negative voltage range. Varying the concentrations of external/internal KCl(mM) to 40/200, 200/200, 200/100 and 200/40 shifted reversal potentials to $-30.8{\pm}2.9$(n=3), $-1.1{\pm}2.7$(n=3), 10.5 and 30.6(mV), respecrivety. These reversal potentials were close to the expected values by the Nernst equation, indicating nearly ideal selectivity for $K^+$ over $Cl^-$. Under bi-ionic conditions of 200mM external test ions and 200mM internal $K^+$, the reversal potentials for each test ion/K pair were measured. The measured reversal potentials were used for the calculation of the releative permeability of alkali cations to $K^+$ ions using the Goldman-Hodgkin-Katz equation. The permeability sequence of 5 cations relative to $K^+$ was $K^+$(1), $Rb^+$(0.49), $Cs^+$(0.27), $Na^+$(0.027) and $Li^+$(0.021). This sequence was recognized as Eisenman's selectivity sequence IV. In addition, modelling the permeation of $K^+$ ion through ATP-sensitive $K^+$ channel revealed that a 3-barrier 2-site multiple occupancy model can reasonably predict the observed current-voltage relations.

• 한국화재소방학회논문지
• /
• 제21권2호
• /
• pp.48-53
• /
• 2007

혼합물의 인화점에 대한 지식은 산업 현장에서 화재화재 예방 및 방호를 위해서 매우 중요하다. 본 연구에서는 water+2-propanol 계의 인화점을 Tag 개방식 장치(ASTM D1310-86)를 이용하여 측정하였다. 실험값은 Raoult의 법칙, Van Laar 모델식과 NRTL 모델식에 의해 계산된 값들과 비교되었다. 그 결과, Van Laar 모델식과 NRTL(non random two liquids) 모델식에 의한 예측값이 Rauolt의 법칙에 의한 예측값 보다 실험값에 더욱 근접하였다. 이는 water+2-propanol 계와 같은 비이상용액의 활동도 계수값을, Van Laar 및 NRTL 모델식이 Raoult의 법칙보다 정확하게 계산하기 때문이다. 또한, Van Laar 모델식의 실험값에 대한 모사성이 NRTL 모델식의 그것 보다 우수하였다.