• Proceedings of the Korean Society for Agricultural Machinery Conference
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• 1993.10a
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• pp.627-636
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• 1993

The so-called northern Agricultural Engineering of Farmer's courtyard Energy Ecological System is a courtyard-type energy ecological synthetic application system, that combines into one the biogas pool, pig house, toilet and plastic -membrane greenhouse in a fully-closed condition in farmer's court yard, a combination of farming with breeding industry, with bioga as the key linkage , by taking full advantage of solar energy and through bioenergy conversion technique in accordance with ecological principle.

• Proceedings of the Korean Society for Agricultural Machinery Conference
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• 1993.10a
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• pp.1312-1317
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• 1993

Rattan has found various engineering application, especially in furniture industry, however its potential engineering application has not been fully realized because of lack of information of its mechanical properties . It is therefore the objective of this paper is to report some of the recent research work conducted to investigate some of mechanical properties of rattan. The principal tests performed were compression strength parallel to grain in green and dry conditions.

• Journal of Technology Innovation
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• v.9 no.2
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• pp.56-76
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• 2001

The main purpose of this study is to analyse the digital divide and th determinants of ICT diffusion rate in Korean industries. We estimate the ICT diffusion function using the pooling data for this analysis. The results are as follows. First, the ICT capital accumulated in machinery & equipment, electrical machinery and construction industry is estimated to be 83% of total In capital stock in the 90s. Second, using the panel analysis, we find positive correlation among ICT diffusion, network effect and accumulation of human capital, which is more prominent in the service sector. Third, the estimation results show that the additional 1% increase of human capital accumulation will allow to increase the 0.69% of ICT capital intensity in Korean industries.

• Proceedings of the Korean Society of Marine Engineers Conference
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• 2012.06a
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• pp.119-120
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• 2012

In the various industry plant, it need a condition monitoring system for an active machine that used an detachable wireless sensors. In this paper, IEEE802.15.4 standard based detachable wireless sensor monitoring system configure results will be introduced.

• Proceedings of the Korean Society for Agricultural Machinery Conference
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• 2002.07a
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• pp.60-65
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• 2002

최근 신규 공급되고 있는 트랙터와 같은 로외 승용형 차량 및 산업용차량에는 고가의 유압 장치들이 부착되어지고 있다(그림1, 그림2). 이러한 차량들에 장착되어지고 있는 유압장치들은 아직 국내의 기술로는 제품의 정확도 및 신뢰성 등이 문제시되어 대부분이 수입에 의존하는 고가의 장비들이므로 특별한 관리가 요구되어지고 있는 실정이다. (중략)

• Proceedings of the Korean Society for Agricultural Machinery Conference
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• 2017.04a
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• pp.74-74
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• 2017

밀식파종 묘 이앙 시스템은 벼농사 생력화를 위한 재배법으로 비용 및 노동력을 획기적으로 줄일 수 있어 시간과 잉여 공간의 유효 활용을 통해 영농 규모의 확대로 인한 농업의 경쟁력을 높일 수 있다. 하지만 밀식 파종한 육묘를 관행과 동일한 1개 소당 3~4주 이앙 가능한 식부부 개발은 미흡한 실정이다. 밀식 파종한 육묘를 기존 이앙기로 이앙작업을 할 경우, 1개 소당 이앙되는 양이 많아져, 벼 생육을 저하 시키는 요인이 된다. 이러한 부분을 해결하기 위해서는 이앙 작업에 직접적으로 영향을 주는 이앙기식부부의 로터케이스, 이앙암을 분석하여 밀식파종 묘에 적용할 수 있는 기술이 필요한 실정이다. 본 연구에서는 식부부의 로터케이스, 이앙암을 3D 스캐너를 활용하여 스캐닝 작업을 한 뒤 역설계를 통하여 도면화 작업을 실시하여 식부부 궤적 분석을 실시하였다. 분석은 다물체 동역학 해석 프로그램인 Recurdyn(V8R4, Functionbay)을 활용하여 진행하였다. 분석결과, 식부부에 위치하는 이앙집게의 형상 및 로터케이스의 기어 배열에 따라 식부부가 형성하는 궤적의 형태가 달라지는 것을 확인 할 수 있었다. 이러한 부분은 밀식파종 묘에 적합한 궤적 분석 및 현장 필드 실험에 필요한 기초자료로 활용하고자 한다.

• International Journal of Safety
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• v.5 no.1
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• pp.5-9
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• 2006

The present study reports on the results of a risk survey of machinery safety at a shoe factory in Qingdao, China. The aim is to decrease industrial accidents and increase worker job satisfaction by searching for a change from a trend analysis and making improvements in problem areas. The first risk survey for machinery safety was carried out in April 2005. Based on the analysis of the survey results, machinery safety devices was installed in the factory by using CATlA V5. Also, we investigated job satisfaction concerning working apparatus and work tool improvement in a questionnaire about the working environment. The second survey of machinery safety was carried out in September 2005. We are in the process of comparing the first survey results with the second survey results in order to analyze decreasing trend in industrial accidents and improvement in job satisfaction. So far the data have shown improved short-term turnover and absenteeism. It means CATIVA V5 and CFR has had positive effect regarding safety in shoe manufacture industry. The survey with CATIVA V5 and CFR will be expanded to other East-Asian countries including Vietnam. The hope is that the present approach could make a significant contribution toward improved safety.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2004.10a
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• pp.644-647
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• 2004

Optical add/drop multiplexers (OADMs), one of the new network elements, will play a key role enabling greater connectivity and flexibility in the dense wavelength-division multiplexing (DWDM) networks. The importance of OADMs is that they allow the optical network to be local transmitting/extraction on a wavelength-by-wavelength basis to optimize traffic, efficient network utilization, network growth, and to enhance network flexibility. Also, the automatic assembly system of micro optical filters and fibers is a key technology in the development of optical modules with high functionality. Recently, one of remarkable tends in the development of optical communication industry is the miniaturization and integration of products. In this research, we have developed a system capable of automatic alignment of a film filter and a lensed fiber in order to improve the speed and losses in the optical fiber to filter alignment of optical modules. Using the developed automatic alignment system and silicon optical benches, we have fabricated the micro OADM and measured the insertion loss and aging effect.

• Journal of Biosystems Engineering
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• v.42 no.4
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• pp.283-292
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• 2017

Purpose: Japanese Apricot, a type of plum, has various medicinal and economical applications. Plums are quite popular worldwide, but their deseeding remains a serious impediment to their processing. Therefore, a plum (Japanese Apricot) seed remover (PSR) was developed that can use various types of cutters according to the purpose of the plum processing, and its performance was evaluated. Methods: The proposed PSR, which allows multipurpose cutters, namely, zero-, two-, and four-blade cutters, to be installed, was first designed and manufactured. To identify appropriate parameters related to the cutting pressure, plums were harvested from three regions during three harvesting periods, and their geometrical and mechanical properties were measured. After application of the parameters related to the cutting pressure, a performance test was carried out on both fresh and frozen plums by identifying the ratios of the flesh recovery, seed recovery, seed breakage, deseeding efficiency, and machine efficiency. Results: The results show that, using the proper calculation of the processing parameters, 100% deseeding efficiency was facilitated regardless of the type of cutter used. However, in the case of a four-blade cutter, there are significant differences in the flesh recovery ratio according to the plum setting angle. Between the fresh and frozen plums, all cutters showed a significantly better flesh recovery ratio for the case of fresh plums. Conclusions: This machine will advance the plum processing technology, and eventually help the plum industry flourish.

• Tribology and Lubricants
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• v.31 no.6
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• pp.308-315
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• 2015

In the tribological performance of materials, a textured surface reduces the friction coefficient and wear. This study investigates the effects of a pattern of 300 µm dimples in a hexagonal array on the tribological characteristics. Previous studies investigated 200 µm dimples by using a similar material and method. There are three frictional conditions based on the Stribeck curve: boundary friction, mixed friction, and fluid friction. In this experiment, we investigated the frictional characteristics by conducting frictional tests at sliding speeds ranging from 9.6 rpm to 143.3 rpm and a normal load ranging from 13.6 N to 92 N. We used a photolithography method to create dimples for surface texturing. We used five specimens with different dimple densities 10%, 15%, 20%, 25%, and 30% in this study. The dimple density on the surface area is one of the important factors affecting the friction characteristics. The duty number graph indicates a fully developed fluid friction regime. Fluid friction occurs at a velocity of 28.7-143.3 rpm. We observed the best performance at a dimple density of 10% and a dimple diameter of 300 µm in the hexagonal array, the lowest friction coefficient at 0.0037 with 9.6 rpm 9.6N load, and the maximum friction coefficient at 0.0267 with 143.3 rpm 92N load.