• 유체기계공업학회:학술대회논문집
• /
• 유체기계공업학회 2001년도 유체기계 연구개발 발표회 논문집
• /
• pp.221-226
• /
• 2001

HANARO, 30MW of research reactor, was installed at the depth of 13m of open pool, The $90\%$ of primary coolant was designed to pass through the core and to remove the reaction heat of the core. The rest $10\%$, of the primary coolant was designed to bypass the core. And the reactor coolant through and bypass the core was inhaled at the top of chimney by the coolant pump to protect that the radiated gas was lifted to the top of reactor pool. But, the part of core bypass coolant was not inhaled by the reactor coolant pump and reached at the top of reactor pool by natural convection and increased the radiation level on the top of reactor pool. To reduce the radiation level by protecting the natural convection of the core bypass flow, the hot water layer (HWL, hereinafter) was installed with the depth of 1.2m from the top of reactor pool. As the HWL was normally operated, the radiation level was reduced to five percent ($5\%$) in comparing with that before the installation of the HWL. When HANARO was operated with higher temperature than the normal temperature of the HWL by operating the standby heater, it was found that the radiation level was more reduced than that before operation. To verify the reason, the heat loss of the HWL was calculated. It was confirmed through the results that the larger the temperature difference between the HWL and reactor hall was, the more the evaporation loss was increased. And it was verified that the radiation level above was reduced more safely by increasing the capacity of heater.

• 마이크로전자및패키징학회지
• /
• 제25권4호
• /
• pp.41-45
• /
• 2018

패널 레벨 패키지(Panel Level Package)에서 공정 단계별로 발생하는 휨(warpage)에 대해 유한요소법을 이용하여 전산모사를 진행하였다. $5{\times}5mm^2$ 크기의 실리콘 칩이 총 221개가 포함된 $122.4{\times}93.6mm^2$ 크기의 패널에 대해서 (1) EMC 몰딩, (2) detach core 부착, (3) 가열, (4) 캐리어 분리, (5) 냉각의 5 단계에 대해서 해석을 수행하였으며, 캐리어와 detach core 소재로 유리와 FR4의 조합이 휨 현상에 미치는 영향을 조사하였다. 캐리어 및 detach core의 소재에 따라 공정 단계별로 휨의 경향이 다르게 나타나고 있으나, 최종적으로는 유리를 캐리어로 사용하는 경우에 detach core의 소재와 관계없이 FR4 캐리어에 비해 낮은 휨 값을 나타내었으며 유리 캐리어와 유리 detach core의 조합에서 가장 낮은 휨 값이 관찰되었다.

• Bulletin of the Korean Chemical Society
• /
• 제31권11호
• /
• pp.3217-3220
• /
• 2010

The electronic structures and bonding configuration of histidine on Ge(100) have been investigated with various sample treatments using core-level photoemission spectroscopy (CLPES). Interpretation of the Ge 3d, C 1s, N 1s, and O 1s core level spectra being included in these systems revealed that both the imino nitrogen in the imidazole ring and the carboxyl group in the glycine moiety concurrently participate in the adsorption of histidine on a Ge(100) surface at 380 K. Moreover, we could clearly confirm that the imino nitrogen with a free lone pair in the imidazole group adsorbs on Ge(100) more strongly than the carboxyl group in the glycine moiety by examining systems annealed at various temperatures.

• 대한임베디드공학회논문지
• /
• 제8권1호
• /
• pp.17-24
• /
• 2013

In this paper, we present a multi-core processor including multimedia specific instructions to process multimedia data efficiently in the mobile environment. Multimedia specific instructions exploit subword level parallelism (SLP), while the multi-core processor exploits data level parallelism (DLP). These combined parallelisms improve the performance of multimedia processing applications. The proposed multi-core processor including multimedia specific instructions is implemented and tested using a Xilinx ISE 10.1 tool and SoCMaster3 testbed system including Vertex 4 FPGA. Experimental results using a fire detection algorithm show that multimedia specific instructions outperform baseline instructions in the same multi-core architecture in terms of performance (1.2x better), energy efficiency (1.37x better), and area efficiency (1.23x better).

• Steel and Composite Structures
• /
• 제39권3호
• /
• pp.229-241
• /
• 2021

This work focused on aluminum foam sandwich (AFS) with different foam core densities and different face-sheet thicknesses subjected to constant amplitude three-point bending cyclic loading to study its fatigue performance. The experiments were conducted out by a high frequency fatigue test machine named GPS-100. The experimental results showed that the fatigue life of AFS decreased with the increasing loading level and the structure was sensitive to cyclic loading, especially when the loading level was under 20%. S-N curves of nine groups of AFS specimens were obtained and the fatigue life of AFS followed three-parameter lognormal distribution well. AFS under low cyclic loading showed pronounced cyclic hardening and the static strength after fatigue test increased. For the same loading level, effects of foam core density and face-sheet thickness on the fatigue life of AFS structure were trade-off and for the same loading value, the fatigue life of AFS increased with aluminum foam core density or face-sheet thickness monotonously. Core shear was the main failure mode in the present study.

• 한국정보시스템학회지:정보시스템연구
• /
• 제15권4호
• /
• pp.1-22
• /
• 2006

Nowadays, IS projects are getting more complicated and large-scaled. Therefore, many researchers and practitioners have been interested in the IS development methodologies, automated tools, techniques, and TQM to improve IS performance. Latest Standish Group's research reported that after the PMO introduction, project scale became bulkier than 1 or 2 year ago, and that IS development project success probability was increased sharply by 62 percents from 37. The previous researches listed just various PMO functions. This research is to seize the core functions and management level of the PMO affecting on the IS project performance with banks which are the leading industry to accept the PMO in Korea. The activities in the categories of implementation management technology support management infrastructure management are the core functions of the PMO to affect the IS performance including schedule management quality management user and stakeholders' satisfaction. Also, the PMO management level is important for IS project success. Among the 5 levels PMI suggested, PMO can implement the project effectively at least at the third level. Korean companies which are about to introduce the PMO have to consider the PMO core functions and management level to increase the IS maturity.

• The Journal of Korean Physical Therapy
• /
• 제26권5호
• /
• pp.351-357
• /
• 2014

Purpose: The purpose of this study was to investigate level of functioning in patients with stroke using Modified Bathel Index (MBI), World Health Organization Disability Assessment Schedule 2.0 (WHODAS 2.0), and ICF core-set for stroke. Methods: Sixty-four patients with stroke were recruited for this study from nine medical institutes. The ICF core-set for stroke, WHODAS 2.0, and MBI were used to collect subjects' functional levels. ICF core-set was employed here as a standard frame to observe multi-dimension of functioning, that is physiological bodily function, activity and participation (AP) in daily life, and current environmental factors (EF) in patients with stroke. WHODAS 2.0 and MBI were also used in order to have a specific functioning level for subjects. The linkage of each item in WHODAS 2.0 and MBI into the ICF core-set for stroke was examined. Pearson correlation coefficient was used for analysis of their relationships. Results: Functioning level of participants showed moderate resulting from MBI and WHODAS 2.0 ($73.48{\pm}22.27$ and $35.55{\pm}12.53$, respectively). Strong relationship was observed between ICF core-set and WHODAS 2.0, and with MBI. Each item of disability scales was obtained its linkage into ICF in the domain of AP. However, lack of correlation between MBI and ICF in the domain of EF was found due to absence of related factors. Conclusion: MBI was found to be linked mainly into ICF in the domain of AP and to have limited linkage into EF. Therefore, it should be suggested that the ICF concept frame should be used as a multi-dimensional approach to patients with stroke.

• 한국콘크리트학회:학술대회논문집
• /
• 한국콘크리트학회 2005년도 봄학술 발표회 논문집(II)
• /
• pp.133-136
• /
• 2005

Compressive strength of recycled aggregate concrete was tested by the core and by the non-destructive testing. A prediction model of compressive strength considering the replacement level of recycled aggregate was suggested by multi-regression analysis and was compared with test results. Also, Test results showed that the ratio of compressive strength by core and non-destructive testing to actual was somewhat affected by the replacement level of recycled aggregate.

• 대한전자공학회:학술대회논문집
• /
• 대한전자공학회 2002년도 하계종합학술대회 논문집(2)
• /
• pp.325-328
• /
• 2002

In this paper, we present a SystemC model of a 32-Bit RISC core wi)ich is based on the ARMTTDMI architecture. The RISC core model was first modeled in C for architecture verification and then refined down to a level that allows concurrent behavior lot hardware timing using the SystcmC class library. It was driven in timed functional level that uses handshake protocol. It was compiled using standard C++ compiler. The functional simulation result was verified by comparing the contents of memory, the result of execution with the result from the ARMulator of ADS(Arm Developer Suite).

• 정보보호학회논문지
• /
• 제27권2호
• /
• pp.281-292
• /
• 2017

지속적인 북한의 사이버 공격에 대응해서 사이버 무기체계와 핵심기술의 연구개발 추진을 요구받고 있는 상황이다. 본 논문은 사이버 무기체계에 소요되는 핵심기술을 도출하고, 도출된 핵심기술들의 실현시기에 대한 영향 요인을 분석하였다. 9개의 핵심기술군, 36개의 핵심기술이 도출되었으며, 도출된 핵심기술군을 합동사이버작전교범의 작전단계와 록히드마틴의 사이버 킬체인과 비교해 본 결과, 누락된 요소가 없이 매핑되고 있음을 확인하였다. 핵심기술의 실현시기에 대한 각 요인별 영향도를 회귀분석한 결과, 핵심기술의 실현시기는 최고선진국 기술수준, 한국 기술수준, 국방에서 민간으로의 기술이전 가능성, 민간에서 국방으로의 기술이전 가능성이 높을수록 더 빨라지고, 선진국의 기술이전 기피도가 높을수록 더 늦어지며, 경제적 파급효과와는 유의미한 상관관계가 없는 것으로 확인되었다. 본 연구는 사이버무기 체계를 정식 무기체계로 편입시킨 전력발전훈령 개정 및 합참사이버작전교범 제정에 맞춰 사이버 무기체계의 핵심기술을 도출하고 핵심기술 실현시기의 영향 요인을 확인한 것에 의의가 있다.