• Transactions of the Korean Society of Mechanical Engineers A
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• v.32 no.11
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• pp.984-989
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• 2008

Hydraulic excavators have been one of the most popular devices in the various industries for construction, forestry and agriculture etc. Because the excavators generally work in poor environment, the various organizations study to automate those. In this paper, a hydraulic simulation for evaluation of automatical excavation system is presented. It is using the AMESim based on the 1.5 ton excavator with fixed displacement pumps, and operated by signals those control pilot pressure to spools of the main control valve. The main control valve is regarded that only consists of boom, arm and bucket. This simulation program is expected to apply to evaluation of the controller for automatic excavation system and to estimate of effect in accordance with change of some components or parameter.

• Fashion & Textile Research Journal
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• v.6 no.6
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• pp.715-722
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• 2004

The social culture critics say that the current situation of the boom in pretty men happened because stereotyped notions of sex roles have changed. However, no scientific study has been done as yet to support this theory. Therefore, this study analyzed the present situation and examined it from many different points of view. I asked 600 men to fill out the questionnaire: 300 from Daegu and the other 300 from Seoul. I analyzed four 461 of them. The inner/outer image of Korean males in their 20s was analyzed into seven factors, a positive image, a progressive image, an affirmative image, a sensible image, an exemplary image, a conscious image, and an active image. The demographic result based on the inner/outer image factors showed a significant difference in ages for a sensible image, a conscious image, and an active image.

• Journal of the Korean Society for Precision Engineering
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• v.16 no.5 s.98
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• pp.19-28
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• 1999

In this study, a real-time simulation system and a washout algorithm for an excavator have been developed for a driving simulator with six degrees of freedom. The excavator model consisting of a boom. bucket, upper frame, lower frame and four wheels, has total 11 degrees of freedom. The suggested washout algorithm consists of high and low pass filters with second order. The high pass filters cut off low frequency of the motion cues limited by platform motion. The cut off frequency for the tilt coordination are suggested for a realistic regeneration of excavator motion.

• Journal of Korean Society of Rural Planning
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• v.16 no.4
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• pp.23-32
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• 2010

Recently, there are many people who live in rural keep getting away from their town. The reason why become aging and reducing society in Rural is weakness of agricultural competition, education, culture and welfare. Thereupon, we need counter plans to make boom in exhaustion rural landscape counter plan, losing consciousness of citizenship, over developing from city planners who are giving serious damage to rural landscape. However, there are many promotions going on to cover weakness of rural. In this research, to set up the right view of rural which considered the different cognitions, it is important to derive each preference or non-preference scenery, and countrified or non countrified scenery. From different cognition, finding preserved and improved factors is necessary to preserve, reform, and improve the countryside scenery. Based on this, to investigate natural characters of viewpoint is providing right direction for future rural landscape.

• Transactions of the Korean Society of Automotive Engineers
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• v.5 no.1
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• pp.101-109
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• 1997

A tool for the dynamic simulation and design technique of the excavator plays an important role in the prediction of dynamic behavior of the excavator in the initial design stage. In this paper, a flexible multibody dynamic analysis model including track of the crawler type excavator is developed using DADS and ANSYS. Through the driving simulation of the excavator travelling over rough road track, frequency characteristics of the upper frame and cabin are obtained, and the reaction forces acting on the track rollers are also presented for the fatigue life estimation. The effect of boom vibration modes on the joint reaction forces and accelerations is presented from the swing simulation.

• Proceedings of The Korean Society of Agricultural and Forest Meteorology Conference
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• 2001.06a
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• pp.3-4
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• 2001

논에서의 증발산과 에너지매분 및 경계층 구조를 이해하기 위한 집중관측 실험-Hari Intensive Field Experiment (HIFE)-이 강화도 하리 에서 있었다 이와 함께 산림에서의 증발산과 에너지 배분을 이해하기 위해 광릉수목원 침엽수림과 활엽수림에서 장기관측을 수행하고있다. 본 연구에서는 봄철 산림과 논에서의 증발산과 이를 조절하는 인자에 대한 분석결과를 논하고자 한다.(중략)

• Journal of the Korea Furniture Society
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• v.12 no.1
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• pp.125-130
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• 2001

The sofa industry, which is now one of the major furniture industries in Korea, has developed since 1970s as the apartment building boom and the rise of living standards triggered its demand. Among others, durable and high-quality leather sofa had been most favored and excelled other sofas since mid-1980s along with the growth of national economy before IMF control tightened money market in late 1990s. Leather sofa is still favored and its industry has great possibilities to increase as people tend to seek higher and more personalized living conditions with the stabilization of economy. However, there are several problems in the sofa industry due to the current economic difficult conditions, i.e.; 1. It is hard to cut down the cost of raw material as the supply mostly depend on import. 2. It is hard to keep product quality due to technical difficulties. 3. There are still illegal duplicates of foreign or domestic competitors'design. The aim of this study is to examine the reality of the leather sofa industry in Korea and to suggest new vision for its progress.

• Proceedings of the Membrane Society of Korea Conference
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• 1998.04a
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• pp.59-60
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• 1998

1. 서론 : 고분자 분리막은 대부분 immersion precipitation에 의한 상분리법으로 제조한다. 이 방법으로 제조한 막은 표면으로 갈수록 치밀한 구조를 갖고, 하부층에는 많은 경우 macrovoid가 형성된다. 이러한 연구의 하나로 PVP와 같은 고분자 첨가제를 고분자 용액에 첨가하여 막을 제조하는 방법에 대한 연구가 Boom 등을 중심으로 이루어져 왔는데, 대부분의 경우 macrovoid가 줄어들고 막의 porosity가 증가하는 결과를 보여준다. 본 연구에서는 막의 재료로 열적, 화학적 성질이 우수한 폴리이미드 막에 대해 PVP가 첨가되었을 때의 영향을 살펴보았는데, 특히 macrovoid가 없고 높은 투과도를 얻을 수 있는 조겅의 용액에 PVP를 첨가하여 막을 제조할 경우 나타나는 막의 구조 및 투과 특성의 변화를 중점적으로 관찰하였다.

• Atmosphere
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• v.11 no.2
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• pp.6-12
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• 2001

The East Asian monsoon is generally accompanied with the quasi-stationary front along the northern and northwestern periphery of the subtropical anticyclone in the boundary zone of the polar cold air mass and the tropical warm air mass. The rainy season in Korea has been called as Changma since the middle of 1500s. In meteorology, the rainy season with the quasi-stationary front, the Changma front, during the early summer has been defined as the Changma since 1905. The difference of meaning on Changma between meteorologists and the general public sometime does give a confusion. For example, the heavy rainfall event after the retreat of Changma is recognized as Changma by the general public, but not by most of meteorologists. The decision of the onset and retreat dates of Changma among the meteorologists is also ambiguous because of different viewpoints on the definition of Changma. In this study we survey the etymology and definition of Changma.

• The Korean Journal of Quaternary Research
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• v.19 no.1
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• pp.18-26
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• 2005

The East Asian summermonsoon is generally accompanied with the quasi-stationary front along the northern and northwestern periphery of the subtropical Northwest Pacific high. The rainy season in Korea has been called as Changma since the middle of 1500s. Understanding of Changma and heavy rainfall advancing along the Changma front is one of main interesting of Korean meteorologists. This study briefly summarized the descriptive characteristics of Changma and its relatedmechanism, definitions on the Changma period, and etymology of Changma through reviewing the previous studies on Changma.