• Proceedings of the Korea Information Processing Society Conference
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• 2003.05b
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• pp.899-902
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• 2003

다양한 형태로 이루어진 가입자 망은 접속방식별로 이기종(異機種)의 장비를 이용하여 가입자에게 단일 형태의 초고속 인터넷 서비스를 제공하고 있다. 전국에 분산된 가입자 망을 효과적이며 집중화된 형태로 관리하기 위해서 다양한 형태의 접속방식을 지원하는 이기종 장비 및 단말들의 상위 개념으로서 추상적이며 논리적인 객체 관리모델이 필요하다. 본 논문은 RM-ODP를 이용하여 통합된 계층적 망관리를 가능하게 하는 인터넷 가입자 망에 대한 모델링 구조를 제시하였다.

• Proceedings of the Korean Association of Geographic Inforamtion Studies Conference
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• 2008.10a
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• pp.119-126
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• 2008

도시공간정보 통합플랫폼은 도시의 체계적이고 과학적인 관리, 특히 지상 및 지하시설물 관리에 필요한 센서 및 미들웨어 기술, 유무선 네트워크, GIS-USN 연계 등의 요소기술이 집적된 지능형 도시운영 기반환경으로 정의된다. 도시공간정보 통합플랫폼은 상수도, 하수도, 가스, 난방, 송유, 전력, 통신의 7대 지하시설물과 교량, 육교, 터널 등 도시 지상시설물 등 도로기반시설물 관리를 지능화 할 수 있는 기반 환경을 제공하는 역할을 수행해야 한다. 본 연구에서는 지능형 도시공간정보 통합플랫폼 개발을 위해 플랫폼의 비전을 설정하고 개방형 분산처리 레퍼런스 모델(RM-ODP, Reference Model for Open Distributed Processing)의 적용을 통해 개발전략을 도출하였다.

• Journal of the Korean Home Economics Association
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• v.35 no.2
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• pp.49-64
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• 1997

The purpose of this study is to classify the patterns of consumption deprivation and to compare the level of consumption deprivation by them. For empirical analysis, this study used the data on 563 households in the city of Inchon collected by the researchers through interviews. The statistical methods used in this study were cluster analysis, oneway ANOVA, and crosstabs. four clusters were classified: 'Overall satisfied Pattern (OSP)', 'Food satisfid with Others deprived Pattern (FS-ODP)', Food Extremely deprived with Food Deprive Pattern (HED-FDP)'. Those I FED-HSP tended to be old aged, and those in GED-FDP tended to be urban unstable workers. The results imply that welfare policy for urban poor households should be differentiated by the characteristics of consumption of each pattern of consumption deprivation.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.10 no.7
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• pp.3231-3244
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• 2016

As processor design has been transiting from homogeneous multicore processor to heterogeneous multicore processor, traditional Amdahl's law cannot meet the new challenges for asymmetric multicore system. In order to further investigate the impact factors related to the Overhead of Data Preparation (ODP) for Asymmetric multicore systems, we evaluate an asymmetric multicore system built with CPU-GPU by measuring the overheads of memory transfer, computing kernel, cache missing and synchronization. This paper demonstrates that decreasing the overhead of data preparation is a promising approach to improve the whole performance of heterogeneous system.

• Proceedings of the Korean Institute of Intelligent Systems Conference
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• 2006.11a
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• pp.268-271
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• 2006

본 논문은 S/W 아키텍처 일반 모델 및 무기체계 S/W 특징을 분석하여 무기체계 S/W 품질속성을 추출한다. 이를 위해 먼저 4+1 View 모델, SEI 모델, Siemens 모델, RM-ODP 모델, Rational ADS 모델을 분석하고 무기체계 임베디드 S/W 특징을 분석하여 품질속성을 추출한다. 그런 다음 품질속성 측정매트릭스를 작성하여 품질속성 추출자료를 매핑하고 최종적으로 필수 이해당사자 관점에서 최종 평가하여 무기체계 S/W 품질속성을 추출한다.

• Journal of Korean Society of Environmental Engineers
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• v.38 no.11
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• pp.589-595
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• 2016

This study evaluated the environmental impacts for landfill treatment of the wastewater treatment sludge (WTS) from petrochemical firms by life cycle assessment (LCA) and reviewed the impact reduction by landfill gas (LFG) utilization. The functional unit was 'landfill of 1 ton of WTS', and the system boundary included the process of input and treatment for WTS in landfill site. The impacts were high at landfill process (LP) and leachate treatment process (LTP). Global warming (GWP) and photochemical oxidants creation (POCP) were high at LP, while abiotic depletion (ADP), acidification (AP), eutrophication (EP), ozone depletion (ODP) were high at LTP. The major substances of various impact categories were crude oil (ADP), $NO_X$ (AP, EP), $CH_4$ (GWP, POCP), $Cl_2$ (ODP), respectively. The major factor of ADP, AP, EP was attributed from the generation of electricity used in LTP, and the methane within uncollected LFG was main factor of GWP and POCP. Therefore, electricity consumption reduction is identified to be an impact improvement option, and the flaring system installation or enhanced LFG recovery could be an alternative to reduce impacts. Among the various categories, GWP accounted the highest impact (${\geq}90%$) followed by ADP, POCP. In the avoidance impact resulted from the utilization of LFG, to substitute B-C oil or LNG showed the impact reduction of 32.7% and 12.0%, respectively.

• Journal of Advanced Marine Engineering and Technology
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• v.17 no.3
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• pp.24-32
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• 1993

Experimental data on the heat transfer characteristics of HCFC-123 and CFC-11 during condensation in horizontal smooth tube are presented. The experimental apparatus consisted of a closed working fluid loop, coolant loop, and measuring system. The major components of the working fluid loop made of a refrigerant pump, boiler, superheater, refrigerant flow meter, receiver and test section. The tube-in-tube type test section was made of smooth tube which were constructed form 9.52 mm outer diameter of smooth copper tube with 50 mm outside diameter of PVC tube duct. The ranges of parameter, such as refrigerant mass velocity, coolant flow rate, and quality were 90-325kg/($m^2$.s), 60-360kg/h, 5-95% respectively. Data were obtained under steady state condition for annular flow. As a result of these, the condensation heat transfer coefficients for HCFC-123 were slightly lower than those of CFC-11 from 8% to 15% inside horizontal smooth tube. Furthermore, a new generalized correlation for the heat transfer coefficients of HCFC-123 and CFC-11 during condensation inside horizontal smooth tube is proposed.

• Journal of Navigation and Port Research
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• v.35 no.4
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• pp.323-334
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• 2011

Suspended and sinking particles were collected in austral summer during ODP Leg 119 to the Indian Ocean sector of the Antarctic Ocean. Field work was carried out at four sampling sites in Prydz Bay. Two of these sites were located in the Outer Bay, and two in the Inner Bay. At the four locations, a total of ten deployments of a sediment trap array were made. The concentrations of chlorophylls and their degradation products both in suspended and sinking particulate matter in Prydz Bay were analyzed using HPLC. Chlorophylls a and c were the dominant algal pigments both in suspended and sinking particles. Because of the abundance of fecal pellets at Site 740, the mean fluxes at 200 m averaged 6 fold greater than that at 50 m. This implies that a dense swarm of zooplankters, presumably large copepods and/or salps, may "feed and excrete" mainly in between 100-200 m depths at this site, closest to land in Prydz Bay. Interestingly, The flux of phaeophorbide a was generally similar in magnitude to that of chlorophyll a throughout the study areas. This is an evidence that materials escaping from near-surface regions in austral summer derive mainly from the gazing of zooplankters. "New production" from sediment-trapped CHL pigment fluxes in Prydz Bay was estimated using f-ratio of 0.15, ranging from 520 to $1,605\;{\mu}gC\;m^{-2}\;day^{-1}$.

• Journal of the Korean Society for Geothermal and Hydrothermal Energy
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• v.6 no.2
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• pp.15-22
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• 2010

The natural refrigerants have used into HVAC equipments because the CFCs and HFCs have some environmental problems like high ODP and GWP. The carbon dioxide has small effect on the environmental problem but also good thermodynamics properties. In this study, the simulation study on the performance and characteristics of a $CO_2$ gascooler and evaporator using a fin-tube and microchannel heat exchanger has been conducted. Besides, the comparison of performance with operating condition was carried out in order to apply to the $CO_2$ heat pump system. As a result, the front sizes of a gascooler and evaporator using a microchannel were decreased by 63% and 58%, respectively, compared to those using a fin-tube. The performance of the fin-tube gascooler and evaporator were more responsive to the variation of operating conditions compared to that of microchannel. The pressure drop of a fin-tube heat exchanger was higher than that of a microchannel one.

• Journal of Internet Computing and Services
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• v.5 no.3
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• pp.87-98
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• 2004

There are several types of distributed subscribers network using Asymmetric Digital Subscriber Line (ADSL), Very high-bit rate Digital Subscriber Line (VDSL), and Data Over Cable Service Interface Specifications (DOCSIS), The efficient and concentrated network management of those several distributed subscribers networks and resources require the general information model of network, which has abstract and conceptional managed objects independent of type of network and its equipment to manage the integrated subscriber network, This paper presents the general Internet subscribers network modeling framework using RM-ODP (Reference Model Open Distributed Processing) to manage that network In the form of integrated hierarchy, This paper adopts the object-oriented development methodology with UML (Unified Modeling Language) and designs and implements the HFC network of DOCSIS as an example of the subscriber network.