• 전기산업
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• v.14 no.6
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• pp.65-71
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• 2003

• Korean Journal of Heritage: History & Science
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• v.56 no.3
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• pp.22-44
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• 2023

The subsistence economics of the early Bronze Age has focused on explaining the intensity of agricultural practices without sufficiently taking into account the diversity of production methods that may arise from cultural types or environmental factors. The problem appears to stem from paying insufficient attention to the question whether we should understand the transition from the Neolithic Age to the Bronze Age as continuous or discrete. This has hitherto blocked an avenue to investigate the gradual changes in subsistence resource production methods. Taking as its premise that changes in the production methods of subsistence resources in the Bronze Age have been continuous and gradual, this paper seeks to restore the production patterns of subsistence resources according to the variety of factors that may have influenced the early Bronze Age production method. With diverse cultural patterns and ecological spaces of the early Bronze Age being confirmed, the work of restoring the production methods of subsistence resources in a specific period is difficult to achieve with one or two stand-alone analyses. A more appropriate method would involve separating a number of different aspects related to the production of subsistence resources, analyzing and interpreting each, and in the final stage, synthesizing the analyses. The specific research method employed in this paper checked for compositional differences in stone production tools, functionally categorized according to a variety of factors that have a close relationship with the production of subsistence resources: cultural-environmental factors and cultural patterns, geographical and topographical factors, soil productivity, and size of settlement. The results of the analysis are as follows: for the early Bronze Age production pattern of subsistence resources in the Seoul and Gyeonggi regions, while no substantive differences were observed with respect to cultural type, geographical and topographical location, the results show statistically significant differences in the composition of production tools according to settlement size and soil productivity. Also, with an increasing ratio of settlement size and total production soil, increases in hunting and armoring tools, woodworking tools, and harvesting tools were observed; on the other hand, when it came to the ratio of fishing tools, the opposite relationship was observed. While a correlation between settlement size or crop cultivation productivity and dependence on hunting or farming was expected, the results of the regression analysis show that settlement size and soil productivity ratios do not have mutually significant relationships. The results thus illustrate that patterns of production differ according to a variety of factors, and no single factor is decisive in the adoption of subsistence resource production methods by a specific settlement. Therefore, the paper emphasizes the need to investigate the production patterns of subsistence resources according to the variety of cultural and environmental factors that make up settlements in early Bronze Age society.

• Proceedings of the KIEE Conference
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• 2000.07d
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• pp.2822-2824
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• 2000

이 논문에서는 공장에서의 생산관리 및 구내 배전선로의 부하상태 관리용으로 개발한 다목적 실시간 원격 계측시스템을 제안하고 있다. 개발된 실시간 원격 계측시스템을 필요한 정보를 수집하는 원격단말장치와 수집된 정보를 제어 및 RS485 통신을 이용하여 정보를 전송하고 사용자 중심으로 그래픽 관리하는 호스트로 구성되어 있다. 특히, 기 설치된 생산설비에 대한 원격 생산관리 기능을 보유한 시스템을 확장하여, 이를 구내 배전선로에서 각 구간/선로별 전압, 전류, 누설전류 등의 정보 검출한다. 각 구간/선로별 전력, 전압, 전류 등 부하 운영상태 및 누설전류 등의 고장원인을 검출함으로써 전기화재 및 감전사고를 예방할 수 있는 감시 시스템을 제안하였다.

• Applied Chemistry for Engineering
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• v.20 no.2
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• pp.213-217
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• 2009

Microbial fuel cells (MFCs) have been known as a new alternative energy conversion technology for treating wastewater and producing electricity simultaneously. A MFC converts the chemical energy of the organic compounds to electrical energy through microbial catalysis at the anode under anaerobic conditions. To examine the performance of MFC, in this work, the characteristics of the efficiency of wastewater treatment and generation of electricity was evaluated for sewage. When acetate as a carbon source was added into the sewage, the removal efficiency of COD was increased from 75.7% to 88.2% and the voltage was increased significantly from 0.22 V to 0.4 V. The influence of distance between anode and cathode was examined and the effect of the surface area of anode was investigated under the various external resistances. It was found that the maximum power density was $610mW/m^2$ and power generation was effective when the distance between the electrodes was shorter and the surface area of the anode was smaller.

• 전기산업
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• v.8 no.6
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• pp.95-98
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• 1997

• NEWSLETTER 전기공업
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• no.92-3 s.46
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• pp.1-23
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• 1992

• NEWSLETTER 전기공업
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• no.94-2 s.99
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• pp.29-44
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• 1994

• KOREAN POULTRY JOURNAL
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• v.19 no.10 s.216
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• pp.34-35
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• 1987

병아리 값 470원, 육계전기사료 4만여톤 생산, 월육계 사료생산 10만톤 돌파 등의 생산과잉, 노사분규로 단체 소비 격감, 태풍과 폭우로 계속된 복중성수기 소비부진 등으로 사상 유례없는 어려움을 겪었던 여름철이었다. 단기간의 회복기미는 보이지 않는다.

• Environmental and Resource Economics Review
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• v.7 no.1
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• pp.1-28
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• 1997

최근 전력가격의 인상을 통한 전력수요 조절에 대한 관심이 높아지고 있다. 본고에서는 개방경제 CGE 모형을 통하여 전기요금 인상이 국민총생산, 물개 무역수지 등 주요 거시변수들에 미치는 영향과 개별 산업의 생산, 생산물 가격, 수출입에 미치는 영향을 분석하였다. 이를 위하여 1993년도 산업연관표에 기초하여 전체 산업을 16개 부분으로 통합, 재분류한 뒤, 전기요금 인상에 대한 다양한 정책실험을 시도하였다. 분석 결과 전력가격인상은 실질총생산의 감소 및 물가의 상승을 가져오나 그 정도는 기존의 연구보다 작은 것으로 나타났으며, 수출과 수입은 모두 감소하나 수출감소율이 수입감소율을 초과하여 무역수지는 악화되는 것으로 나타났다. 산업부문별로는 전기요금인상에 따라 비교역재에 가까운 서비스업의 생산량 감소효과가 두드러진 것으로 나타났다.

• 전기의세계
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• v.41 no.12
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• pp.38-42
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• 1992

1980년대 후반부터 국내 제조업의 생산시스템을 획기적으로 개선시켜야 할 필요성이 세가지 측면에서 보다 구체적으로 나타나기 시작하였다. 1. 국제경쟁력을 결정하는 주요 요인이 종래의 부존자원과 자본 중심에서 자동화.정보화를 통한 지식, 정보, 창의력에 의한 첨단기술 중심으로 점차 변화되고 있고 2. 노동력 부족상태가 심화됨에 따라 1인당 부가가치 생산액이 크게 증대되어야 한다는 것이고 3. 기계, 전자, 자동차 등과 같은 첨단 산업이 제조업에서 차지하는 비중이 급증할 것으로 예견됨에 따라 산업 구조의 질적 고도화를 뒷받침할 기반정립이 시급히 요구되고 있다는 것이다. 이러한 측면들을 종합하여 볼때, 첨단생산시스템의 개발은 매우 시의절적하고도 중요한 일이라 할 것이다.