• Wind and Structures
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• 제22권5호
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• pp.555-571
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• 2016

A hanging-type sand-retaining wall is a very common sand-blocking fence structure used to prevent sand movement. This type of wall is widely used along the Qinghai-Tibet and Gobi desert railways in Xinjiang, Western China. To analyze the characteristics of wind-sand flow fields under the effect of such a sand fence structure, a wind tunnel test and a field test were carried out. The wind tunnel test showed the zoning characteristics of the flow fields under the effect of the hanging-type sand-retaining wall, and the field test provided the sediment transport data for effective wind-proof interval and the sand resistance data in the front and behind the sand-retaining wall. The consistency of the wind-sand flow fields with the spatial distribution characteristic of wind-carried sand motion was verified by the correspondences of the acceleration zone in the flow field and the negative elevation points of the percentage variations of the sand collection rate. The spatial distribution characteristic of the field sand collection data further showed the spatial structural characteristic of the sandy air currents under the action of the hanging-type sand-retaining wall and the sand resistance characteristic of the sand-retaining wall. This systematic study on the wind-sand flow fields under the control of the hanging-type sand-retaining wall provides a theoretical basis for the rational layout of sand control engineering systems and the efficient utilization of a hanging-type sand-retaining wall.

• 현장농수산연구지
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• 제26권2호
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• pp.25-30
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• 2024

This study was conducted to develop the hanging type circular-patterned system that at maximizing the spatial efficiency of strawberry cultivation to increase yields, while also reducing labor and improving energy efficiency. The system consists of a cultivation bed units, longitudinal moving device, bed lifting device, front and rear transfer devices, lateral transfer device, nutrient supply device, and control unit. Performance testing revealed that the operational motor for longitudinal movement should have a torque of at least 0.1Nm based on the design weight and traction force of the cultivation bed unit. The power consumption required to move one cycle was calculated to be approximately 149Wh when performing harvesting or maintenance tasks for all 10 cultivation beds. Vibration angles measured during bed movement showed that the lateral transfer resulted in a roll angle ranging from -0.62° to 0.68° and a pitch angle ranging from -3.79° to 5.26°. For longitudinal transfer, the roll angle ranged from -3.37° to 3.36°, and the pitch angle ranged from -0.45° to 0.49°.

• 헤리티지:역사와 과학
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• 제55권3호
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• pp.152-176
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• 2022

본고는 삼국시대 화살집 복원에 대한 기초 연구로, 기존 화살집 복원 안에 대한 세부내용을 보완하기 위한 연구이다. 현재 발굴된 삼국시대 화살집은 화살을 담는 주머니인 수납부, 그리고 화살집의 등판에 해당하는 배판부로 구성된다. 그러나 2부위는 남아있지 않고, 금속 부품만 발굴되고 있다. 출토된 화살집을 3가지 유형으로 분류하여 복원하였다. 수납부 금구를 중심으로 W자형 부품과 ㄷ자형 부품으로 구성된 1유형, 띠형 금구만 확인된 2유형으로 분류했다. 3유형은 2유형과 비슷하지만 적수금구에서 뻗친 철띠가 띠형 금구에 연결되는 화살집으로, 별도의 유형으로 상정하였다. 3가지 유형의 화살집에 대한 복원 안을 제시하기 전에 적수금구 위치와 유기물 관찰 내용을 반영하였다. 또 출토정황만으로 알 수 없는 적수금구의 위치와 같은 내용은 조선시대 화살집과 일본의 정창원, 하니와에서 관찰되는 화살집 착용방법에서 착안하였다. 적수금구를 기준으로 삼은 기존 화살집 변천 안을 참고하면, 화살집은 본고의 1유형에서 2·3유형으로의 변화한다. 변화의 요인에 대해 화살을 담는 수납부 공간과 화살집을 착용하는 방법의 변화에서 찾았다. 그러나 일부 2·3유형은 1유형의 착장 방식을 유지하고 있고 구식의 부품을 유지된 사례도 있었으며, 함안지역에서는 전형적인 1유형이 늦게까지 부장되는 양상을 확인할 수 있었다.

• 한국석유지질학회:학술대회논문집
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• 한국석유지질학회 2001년도 제8차 학술발표회 발표논문집
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• pp.6-22
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• 2001

A study of the fracture systems in outcrops of southern onshore Vietnam revealed two kinds of fracture groups according to their origin: cooling fractures and deformation related fractures. Cooling of magma introduced extensive fractures in the batholiths with wide spacing and narrow aperture. They are found widespread in all magmatic bodies, but result in poor reservoir quality due to low bulk porosity and narrow aperture. Cooling fractures are often reactivated during later stress regimes. Deformation related fractures, especially 'fault damage zones' and 'hanging wall deformation' is thought to form the most important reservoir type in the fractured basement rock. The porosity formed by intense fracturing and fault breccia along minor fault zones is thought to be the producing zones in the producing fields of Cuu Long basin. They are found along major faults and widespread in hanging wall blocks.

• 한국연초학회지
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• 제23권1호
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• pp.90-93
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• 2001

In order to save hanging labor hours and reduce work intensity for bulk curing of the flue-cured tobacco, and electric hoist was developed. It consists of a pair of square steel frames with side plates and rolling casters to move back and forth on the second tire of bulk barn, and wire rope type lift was attached to the beneath of its top center. The lift driven by DC motor could be controlled by operating switch with one limit switch and control box, and a scissors shaped gripper was deviced to grip tobacco rack to the end of wire rope. As the results of experiments with electric hoist, labor hours for hanging could be saved by 30 to 40% as compared with those in conventional method. With simple and light structure, it was possible for even woman to load the harvested tobacco, and it could be recommended for farmers to use this device with reasonable price.

• 한국산학기술학회논문지
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• 제18권11호
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• pp.282-289
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• 2017

경제동물에 대한 동물복지에 대한 관심은 전세계적으로 고조되고 있는 추세이다. 그러나, 국내 양돈농가는 경제성 등을 이유로 고려하지 않거나 미비한 도입으로 돼지 본연의 행동이 제한되고 있다. 따라서, 본 연구의목적은 일반적인 사육환경에 환경보조물의 제공이 육성돈의 행동특성에 미치는 영향을 구명하고자 실시하였다. 실험동물은 45두의 3원 교잡육성돈(요크셔${\times}$랜드레이스${\times}$두록; 평균체중, $33.35{\pm}5.5kg$)을 준비하였고, 완전임의배치법(randomized complete block design)에 의해 3개 처리구(대조구; 현수형 환경보조물, T1; 바닥형 환경보조물, T2)에 처리구당 3반복, 반복당 5두씩 반슬러리 돈방에 배치하였다. 현수형 환경보조물은 돼지의 어깨 높이에 현수하였고, 바닥형은 돈방의 가운데에 고정시켰다. 시험기간은 14일간 수행하였으며 시험종료일에 스트레스호르몬인 코티졸(cortisol) 농도를 분석하였고 행동특성은 1과 8일차에 촬영하였고 베가스 프로(Vegas Pro) 13.0 프로그램을 활용하여 및 분석하였다. 체중 및 일당증체량은 대조구와 처리구들간 차이가 없었다. 코티졸호르몬은 T2(25.28 ng/mL)에서 대조구(46.75 ng/mL)보다 유의적으로 낮았다(p<0.05). 1일차 행동 유형별 지속시간은 움직임과 공격 항목에서 대조구에 비해 처리구에서 유의적으로 낮았다(p<0.01). 8일차 놀이행동 지속시간에서 처리구2는 925.12초로 T1의 323.91초 보다 유의적으로 높았다(p<0.01). 반면에 처리구들에 비해 대조구는 움직이지 않는 시간이 많았다(p<0.01). 이러한 결과는 환경보조물 제공이 돼지간 공격성을 감소시키고 돼지의 행동을 활동적으로 만들어 돼지 본연의 행동요구를 충족시킬 수 있음을 시사한다. 그러나, 국내에서 환경보조물에 대한 연구는 미흡하므로 본 연구결과는 보조물을 이용한 동물복지에 대한 기초자료로서 활용 가능할 것으로 사료된다.

• 한국공간정보시스템학회:학술대회논문집
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• 한국공간정보시스템학회 2004년도 춘계 학술발표회 논문집 제1권1호(통권1호)
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• pp.148-157
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• 2004

The structure systems with non-rigid member were classified by the composition type of line and surface members. As a result of the classification, there are 1-way cable structure, cable net and radial cable net structure in the line member system. And there are pneumatic structure and suspension membrane structure in surface member system. In addition, when the line and surface members are composed together, there is the hybrid membrane system which are divided into hanging type and supported type. In this paper, the Korean terms of structure systems with non-rigid member are recommended through this classification. In each the structure systems with non-rigid member, the examples were also investigated considering their historical developments. It present that the light weight structure system and the openness of space have pursued with the developments. So largely, cable net structure with membrane, membrane structure and hybrid structure have used in these days.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2001년도 ICCAS
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• pp.166.4-166
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• 2001

The oscillation of a crane system is divided into the oscillation of container in respect of its trolley and the oscillation of trolley in relation to the whole crane system. We introduce a new type of crane system that avoids to the irreducible sway of crane system caused by hanging cables. The cables suspending the spreader are replaced by using an "anti-sway system". The proposed system is composed of mechanical arms with function of anti-sway based on conventional line system. The effectiveness of the proposed new type crane system and the controller is shown through the simulation results.

• 한국정밀공학회지
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• 제17권6호
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• pp.119-126
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• 2000

In this paper. a simple high-speed crash test rig for members of vehicle was developed for the improvement of crashworthiness of vehicle's side rail. The cart hanging the specimen is accelerated up to 35 mph by the force of freely dropping weight and 1:3 accelerating pulleys. The cart with shock absorbers travels on the rail roads, so it does not transfer any additional vibration to the specimen. To measure the test results, two types of accelerator are considered. the one is a strain gage type and the other is a piezo type. The test rig is rated good to test the specimen like a side rail of vehicle as developing the vehicle's structures in the early design stage.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2000년도 하계학술대회 논문집 C
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• pp.1818-1820
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• 2000

Due to recent technology advances, needs for flat panel displays, plasma display panels(PDPs) whose advantages are simple structure, high resolution, wide viewing angle is increasingly expected to be the first flat panel of large screen, walt hanging TVs. But the luminance and luminous efficiency of color PDP is net up to the level of a CRT. So, New electrode shape which is different from the conventional electrode has to propose to improve the luminance and luminous efficiency. In this paper, we suggested new shaped electrodes. In new shaped electrode, the discharge current was reduced compared with conventional type by reducing the unnecessary diffusion loss near the barrier rib. However, the luminance was nearly the same as conventional type. So, the luminous efficiency improved about 35%.