• 한국전산유체공학회:학술대회논문집
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• 한국전산유체공학회 2009년 춘계학술대회논문집
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• pp.347-354
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• 2009

Plate Heat Exchnager(PHE) has recently become widely adopted for cogeneration systems owing to its small installation space and high thermal efficiency. The gap between plates can be changed depending on its assemble type, i.e. gasket or blazing. The gap is known to affect thermal efficiency and working pressure drop in PHE with complicated geometrical features. Numerical simulation techniques have been developed to deal with PHE with complex configuration of chevron plates. The present study is aiming at identifying the gap effect on pressure drop and thermal efficiency of the PHE. The numerical simulation results show that the gap has relatively large effects on working pressure drop than thermal efficiency in performance of PHE.

• 가정과삶의질연구
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• 제24권2호
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• pp.1-13
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• 2006

The Purpose or this research is to examine the trend or sender gap within a globalization context from 1993 to 2003 on the perspective of feminists who contend that globalization has negative effects on women on account of its masculine nature against neo-liberal viewpoint emphasizing economic efficiency and rationality. As the result of review of statistical and qualitative resources in workforce, it was found that the gender gap has trended toward increasing in some sectors such as flexible labor and high wage jobs, which shows that gender segregation by irrational culture exists in workforce. The evidence to support the neo-liberal viewpoint supposing that the gender discrimination will disappear was also found in sector of wage. The gender gap in wage has decreased during the period of globalization. The dispute of feminists was partly supported, so it was suggested that the policies for gender empowerment should be enforced to diminish gender gap that would be able to increase in the process of globalization.

• 한국정밀공학회지
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• 제16권4호통권97호
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• pp.37-45
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• 1999

Many automated welding equipment are used in the industry. However, there are some problems to get quality welds because of the geometric error, thermal distortion, and incorrect joint fit-up. These factors can make the gap between base plates in case of a thick plate welding. The welding product with the quality welds can not be obtained without consideration of the gap. In this paper, the robot path and welding conditions are modified to get the quality weld by detecting the position and size of the gap. In this work, a low-priced laser range sensor is used. The 3-dimensional information is obtained using the motion of a robot, which holds a laser range sensor. The position and size of the gap is calculated using signal processing of the measured 3-dimensional information of joint profile geometry. The data measured by a laser range sensor is segmented by an iterative end point method. The segmented data is optimized by the least square method. The existence of gap is detected by comparing the data with the segmented shape of template. The effects of robot measuring speed and gap size are also tested. The recognizability fo the gap is verified as good by comparing the real joint profile and the calculated joint profile using the signal processing.

• 한국콘텐츠학회논문지
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• 제20권4호
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• pp.416-426
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• 2020

본 연구에서는 조직문화에 대한 효과성을 실증적으로 증명하는데 있어서 조직구성원들의 인식의 차이(현실 vs. 이상)에 초점을 맞추어 탐색하고자한다. 조직문화에 대한 인식의 차이에 관한 연구는 실무계에서 오랫동안 사용되었음에도 불구하고 학계에서의 연구는 상대적으로 부족한 실정이다. 조직구성원들이 인식하는 조직문화의 현실과 미래에 바라는 이상적인 문화에 대해 함께 파악하는 것은 경영자로 하여금 어디에 경영의 초점을 두어야하는지 경영의 방향성을 제시해준다. 따라서 본 연구는 현실과 이상적인 조직문화간의 차이에 따른 효과를 파악함으로써 보다 구체적인 경영의 방향성을 제시하고자 한다. 이를 위해 단일 기업 근로자 220명을 대상으로 자료를 수집하여 최종 134명의 자료를 분석한 결과, 문화인식 차이는 직무만족 및 정서적 몰입과 관계가 있는 것으로 나타났다. 특히, 공동체 문화에 대한 이상과 현실의 차이가 많이 날수록 직무만족에 부정적인(-) 관계가 있고 이는 정서적 몰입의 감소로 이어졌다. 따라서 조직문화인식차이에 따른 부작용을 줄이기 위해서는 조직차원에서 이상적으로 생각한 조직문화에 대해 구성원들과 합의를 이루는 것이 우선적으로 필요하며 이에 적합한 조직관리를 위해서는 구성원들의 내재적 동기부여 과정을 이해하는 것이 중요하다는 사실을 밝혀냈다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1995년도 추계학술대회 논문집 학회본부
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• pp.39-42
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• 1995

This paper analyzes air gap flux density of the induction motor with the rotor eccentricity and slot effects using Fourier series and FEM. We establishes the validity of results by analyzing the space harmonic order.

• Nuclear Engineering and Technology
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• 제54권11호
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• pp.4005-4012
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• 2022

As high-level radioactive waste (HLW) generated from nuclear power plants is harmful to the human body, it must be safely disposed of by an engineered barrier system consisting of disposal canisters and buffer and backfill materials. A gap exists between the canister and buffer material in a HLW repository and between the buffer material and natural rock-this gap may reduce the water-blocking ability and heat transfer efficiency of the engineered barrier materials. Herein, the basic characteristics and thermal properties of granular bentonite, a candidate gap-filling material, were investigated, and their effects on the temperature change of the buffer material were analyzed numerically. Heat transfer by air conduction and convection in the gap were considered simultaneously. Moreover, by applying the Korean reference disposal system, changes in the properties of the buffer material were derived, and the basic design of the engineered barrier system was presented according to the gap filling material (GFM). The findings showed that a GFM with high initial thermal conductivity must be filled in the space between the buffer material and rock. Moreover, the target dry density of the buffer material varied according to the initial wet density, specific gravity, and water content values of the GFM.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2008년도 International Meeting on Information Display
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• pp.953-956
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• 2008

Using the theoretical model of Auger electron emission, effects of MgO properties which include band gap energy, escape probability, gas ion, and doping elements on the yield of secondary electron emission were examined. The results indicated that the band gap of MgO must be decreased and escape probability must be enhanced in order to increase the yield of secondary electrons from Xe ions and that may proved to be a critical for achieving high luminance efficacy in ac-PDPs.

• Bulletin of the Korean Chemical Society
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• 제35권9호
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• pp.2738-2742
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• 2014

Geometry relaxation effects on the formation of benzene excimer were investigated by means of ab initio calculation at SOS-CIS($D_0$)/aug-cc-pVDZ level. In the case of T-shaped dimer configuration, intermolecular interactions in the excited states are found to be nearly the same as those in the ground state and structural deformations are limited within a single molecule; the geometry relaxation effects are then negligible and singlet-triplet energy gap remains constant. As for face-to-face eclipsed dimer, on the other hand, both molecules undergo structural change. As a result, intermolecular interactions in the excited states are significantly different than those in the ground state. Although the intermolecular distances obtained from potential energy curve calculation with frozen molecular structures are in qualitative agreement, the excited-state binding energies are notably overestimated with respect to those at optimized structures. In particular, the effects are calculated to be larger in $T_1$ state and hence singlet-triplet energy gap, which reduces markedly in this configuration, is underestimated without relaxation.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2011년도 춘계학술대회 논문집
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• pp.824-829
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• 2011

EMS-type Maglev vehicle maintains constant levitation air-gap between electromagnet and guideway by using gap sensor. The other words, when Maglev vehicles levitating over the guideway, mass of the vehicle effects through 1st (electromagnetic air-gap control) and 2nd (air-spring) suspension to grider. Resonace between electromagnetic suspension and grider could be occurred, which causes instability and poor ridecomfort. This paper is to test the dymanic interaction between levitation air-gap and switching system grider that has less mass and high natural frequencies than other type of general girders.

• 한국정밀공학회지
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• 제16권10호
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• pp.187-193
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• 1999

Dimensional difference by welding deformation is usually occurred at steel bridge manufacturting or multi-pass welding used at joining of thick plates. Be this, root gap out of standard is frequently developed at butt weld joints. For example, although standard root gap below 6mm at butt weld joints of plates under 15mm thickness, maximum 30mm root opening is developed at the weld field. At this case, 24mm parts out of standard is generally built up. But, there are no accumulated data and restriction about this built up welding pars. In this study, therefore, the accumulation of data for built up parts and the verification of the mechanical properties of weld part as root gap is performed. It is included that tensile, bending, impact, hardness test and microstructural review for each welding specimen of 0mm, 6mm, 30mm root opening.