• Korean Journal of Social Welfare Studies
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• v.48 no.2
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• pp.97-119
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• 2017

The current study aims to validate Employment Hope Scale (EHS), a dimension of Psychological Self-Sufficiency (PSS) scale, among self-sufficiency program participants in South Korea. Self-sufficiency has been understood primarily from an economic perspective in both policies and studies, with which the process participants changes has been ignored and neglected. This study suggests psychological approach to self-sufficiency programs for the paradigm shift to 'client-centered' practice. In this regard, this study tests the validity of EHS using exploratory factor analsysi (EFA) and confirmatory factor analysis (CFA) in South Korea, developed from a bottom-up client-centered approach and found a 4-factor 17-item structure as Korean EHS(K-EHS). The study results indicate that the K-EHS can be used as a valid supplementary process evaluation tool for self-sufficiency programs.

• Korean Chemical Engineering Research
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• v.55 no.5
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• pp.609-617
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• 2017

Lignocellulosic biomass is a renewable resource for production of biofuels and biochemicals. Furfural (FF) is an important platform chemical catalytically derived from the hemicellulose fraction of biomass. Tetrahydrofurfuryl alcohol (THFA) is a FF derivative and can be used as an eco-friendly solvent with thermal and chemical stability. Despite large numbers of experimental studies for catalytic conversion of FF to THFA, few research have conducted on the economic feasibility for large-scale THFA production from FF. At the stage of assessment of the potential for commercialization of conversion technology, a large-scale process study is required to identify technological bottleneck and to obtain information for solving scale-up problems. In this study, process simulation and technoeconomic evaluation for catalytic conversion of FF to THFA are performed, as the following three steps: integrated process design, heat integration, and economic evaluation. First, a large-scale process including conversion and separation processes is designed based on experimental results. When the FF processing rate is 255 tonnes per day, the FF-to-THFA yields are 63.2~67.9 mol%. After heat integration, the heating requirements are reduced by 14.4~16.4%. Finally, we analyze the cost drivers and calculate minimum selling price of THFA by economic evaluation. The minimum selling price of THFA for the developed process are $2,120~2,340 per tonne, which are close to the current THFA market price.

• Journal of Microbiology and Biotechnology
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• v.22 no.8
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• pp.1148-1154
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• 2012

A novel two-phase anaerobic treatment technology was developed to treat high-concentration organic cassava bioethanol wastewater. The start-up process and contribution of organics (COD, total nitrogen, and $NH_4^+$-N) removal in spatial succession of the whole process and spatial microbial diversity changing when sampling were analyzed. The results of the start-up phase showed that the organic loading rate could reach up to $10kg\;COD/m^3d$, with the COD removal rate remaining over 90% after 25 days. The sample results indicated that the contribution of COD removal in the pre-anaerobic and anaerobic phases was 40% and 60%, respectively, with the highest efficiency of 98.5%; TN and $NH_4^+$-N had decreased to 0.05 g/l and 0.90 g/l, respectively, and the mineralization rate of total nitrogen was 94.8%, 76.56% of which was attributed to the anaerobic part. The microbial diversity changed remarkably among different sample points depending on the physiological characteristics of identified strains. Moraxellaceae, Planococcaceae, and Prevotellaceae were dominant in the pre-anaerobic phase and Bacteroidetes, Campylobacterales, Acinetobacter, Lactobacillus, Clostridium, and Bacillus for the anaerobic phase. Methanosarcinaceae and Methanosaeta were the two main phylotypes in the anaerobic reactor.

• Journal of Korea Technology Innovation Society
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• v.13 no.4
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• pp.700-716
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• 2010

This paper examines the development of smelting reduction process in POSCO from 1990 to 2007 with the perspective of post catch-up technological innovation. POSCO paid attention to smelting reduction process as a sort of next-generation iron and steel technology, and implemented COREX (coal ore reduction) by the cooperation with V$\"{o}$oest. In addition to this, POSCO started to develop FINEX (fine iron ore reduction) which can use abundant powder ore, and FINEX was developed through model plant, pilot plant, demo plant, and commercial facility. POSCO came up to innovation leader beyond fast follower by securing almost technologies concerning FINEX. The case of smelting reduction process shows various characteristics including appropriate technological choice, successive scale-up, spiral development system, complementary technological cooperation, long-tenn investment, the existence of top management's leadership, and Korean government's support in early stage. This case can be interpreted as a path-revealing innovation in the middle of technological paradigm change.

• Proceedings of the Korea Society for Energy Engineering kosee Conference
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• 1996.04a
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• pp.65-70
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• 1996

본 연구는 상용공정해석용 프로그램으로서 고체 반응물을 포함하고 있는 공정을 해석할 수 있는 ASPEN(Advanced System for Process Engineering) 코드를 이용하여 IGCC BSU 실험플랜트를 모사하고 실제 실험 결과와 비교하였으며, IGCC BSU 시스템을 수정보완하여 가스정화공정을 도입하고 석탄가스화기에서 생성된 생성가스에 대해 발전 연료로서의 타당성 및 적합성 여부를 살펴보고 이 자료를 토대로 향후 IGCC 플랜트의 scale-up 및 실용플랜트에 대한 이해를 도모코자 한다. 또한 환경적인 측면에서 IGCC BSU에서 방출되는 슬랙, 비산재 및 flare stack을 통한 SOx 및 NOx 등의 방출량을 살펴보았다.

• Proceedings of the Korea Society for Industrial Systems Conference
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• 2002.06a
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• pp.47-52
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• 2002

현재 많은 산업에서 원료의 단가는 상승하나 재생이 가능한 제품을 효율적으로 사용하기 위한 일환으로써 기존의 설비보다 2배의 생산량을 가질 수 있는 장치를 개발하여 생산량을 극대화 할 필요성이 있다. 본 연구는 벌크 상태의 원료를 이송장치에 의해 디스크에 투입되어 고속으로 회전하는 원판에서 양면의 마찰과 융착으로 인한 순간 냉각으로 비중을 변화시켜 원료를 재생하는 장치이다. 이에 따른 스케일 업에 대한 각종 문제점을 해결하여 양품의 품질을 생산하는 방법을 제시하고 효과적인 시스템을 구축 하고자 한다.

• JSTS:Journal of Semiconductor Technology and Science
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• v.17 no.4
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• pp.524-533
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• 2017

This paper presents a novel reset scheme for mm-scale sensing systems with stringent volume and area constraints. In such systems, multi-layer structure is required to maximize the silicon area per volume and minimize the system size. The multi-layer structure requires wirebonding connections for power delivery and communication among layers, but the area overhead for wirebonding pads can be significant. The proposed reset scheme exploits already existing power wires and thus does not require additional wires for system-wide reset operation. To implement the proposed reset scheme, a power management unit is designed to impose reset condition, and a reset detector is designed to interpret the reset condition indicated by the power wires. The reset detector uses a coupling capacitor for the initial power-up and a feedback path to hold the developed supply voltage. The prototype reset detector is fabricated in a $180-{\mu}m$ CMOS process, and the measurement results with the prototype mm-scale system confirmed robust reset operation over a wide range of temperatures and voltages.

• Proceedings of the KSME Conference
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• 2000.04a
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• pp.860-865
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• 2000

This Paper Proposes the test pieces of X, Y and Z axes to compensate the shape distortion of Selective Laser Sintering(SLS) parts resulting from the phase change during the sintering process. In no case of the proposed compensation test pieces of X, Y axes the accurate rates of shrinkage can be measured with the reduction of curling which is obtained from adjustment of build orientation and the formula used to get scale factors are proposed with the shrinkage rates of them. The scale factors of X, Y and Z axes are generated by building up proposed compensation test pieces. The generated scale iactors are required to satisfy the dimensional accuracy even if there are changes of the build position and the size of SLS parts in the build chamber. For this reason, it is proposed that the build positions and the size be considered to be noise factors against the compensation test pieces and a method is also proposed that scale factors be selected to robustly maintain the dimensional accuracy of SLS parts under the actual operating conditions with the application of the Taguchi Method.

• Journal of Digital Convergence
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• v.17 no.6
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• pp.355-363
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• 2019

This study is an analytical case study focusing on 'low-budget' mobile game development centered on both short-term development and small-scale collaboration. This study set up the assumption of four months as development period limited by three developers along with step by step productional documentation. In the previous study, we set up the responsibilities of the development personnels to analyze the effective process of the practical production. Furthermore, the study analyzed the usability verification of both advantages and disadvantages for conducting the quantitative survey with developer's feedbacks. The study is to provide the essential guideline for 'low-budget' development group with effective pipeline.

• Plant Journal
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• v.5 no.3
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• pp.59-65
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• 2009

In the plant EPC project, the procurement work can be considered as the most important part that affects the success or failure of project as it has the closest mutual influence in every execution process of the project. Procurement takes up generally 60% ~ 70% of the entire project budget and the current trend of plant EPC project becoming larger in scale and a variety of process technology being applied. So, it is needed to identify the risks that are expected to occur according to the stages of procurement work, namely, proposal stage, manufacturer selection and purchasing agreement stage, expediting the process management of manufacturer stage, inspection stage and logistics & transportation stage. The management of observation and control of the risks should be performed with the response techniques which are 'avoid',' transfer'and' mitigate'.