• 대한기계학회:학술대회논문집
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• 대한기계학회 2007년도 춘계학술대회A
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• pp.939-944
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• 2007

Generally, development of a robot capable of fast movements or high payloads is progressed by the analysis of dynamic characteristics, DOF positioning, actuator selection, structure of links, and so on. This paper highlights the design of a robot manipulator handled by a human for man-machine cooperation. The requirements of the proposed system include its having multi-DOF(Degree of Freedom)and the capacity for a high payload in the condition of its maximum reach. The primary investigation factors are motion range, performance within the motion area, and reliabilityduring the handling of heavy materials. Traditionally, the mechanical design of robots has been viewed as a problem of packaging motors and electronics into a reasonable structure. This process usually transpires with heavy reliance of designerexperience. Not surprisingly, the traditional design process contains no formally defined rules for achieving desirable results, as there is little opportunity for quantitative feedback during the formative stages. This work primarily focuses on the selection of proper joint types and link lengths, considering a specific task type and motion requirements of the heavy material handling.

• Environmental Engineering Research
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• 제22권3호
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• pp.237-244
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• 2017

At present, in India, handling of solid waste has become a major challenge for the municipal authorities. Composting of solid waste, especially organic waste, can be one of the solutions to tackle the issue of handling solid waste. The present study is focused on agitated piles composting of flower waste (FW). Five combinations of FW with dry leaves (DL) and cow dung (CD) were prepared to conduct the study. Significant changes were observed due to the addition of bulking agent. The bulking material helps to reduce the production of leachate and also to maintain the aerobic condition within the piles. The reduction of total organic carbon was 21% in FW composting which increased by 36.48% during the composting of FW on addition of DL and CD. On the 120th day of composting, the pH of pile five (70 kg FW + 20 kg CD + 15 kg DL) was 7.33, electrical conductivity 2.77 mS/cm, total organic carbon 26.9%, total nitrogen 2.2%, and C:N ratio was 12. Appropriate proportion of waste mixture played an important role in providing favorable conditions for the microbial transformation of flower waste to stabilized compost. Finally, FW with the combination of CD and DL was found to be successful during pile composting.

• 수산해양교육연구
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• 제21권2호
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• pp.291-305
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• 2009

As you known well, Ulsan port is very famous for handling chemical products which occupies about 80% of quantities of all Korean ports. Many ship's operators prefer to handle liquid cargo es at proper anchorages instead of the berth for saving port expenses. Ulsan M-10 anchorage was assigned for handling liquid cargoes, however this anchorage's space is restricted by the oil pipeline which lays under seabed about 400m off from the center of M-10 anchorage, for which we have to consider of the external force and counter force for keeping the safety of anchoring. Where, external force is induced by wind, tidal currents and wave while counter force is induced by holding power of anchor/chain. In this study, author evaluated a method to analyze theoretically the limit of external force condition up to which an anchoring ship can keep her position without dragging, and for which applied to many kinds of combined Ships as mother ship of 50,000 DWT Tanker and 4 sizes of Tanker as alongsided ship.

• 컴퓨터교육학회논문지
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• 제11권4호
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• pp.59-69
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• 2008

본 논문은 현재 간호학과에 재학 중인 학생들의 컴퓨터 활용 능력과 실제 임상에서의 컴퓨터 활용 실태를 조사하여 현장에서 컴퓨터 활용에 있어서 부족한 부분을 개선하기 위하여 필요로 하는 사항을 제시하였다. 정보과학의 발달로 인한 병원업무는 병원 정보 시스템을 이용한 시스템적 관리 체제가 이루어지고 있다. 그러므로 정보 분야에 대응하는 간호학과에서의 컴퓨터 활용교육은 교양 과목으로 진행되는 일방적이고 획일적인 공급자 중심의 교육이 아닌 현장 환경에 맞는 학습자 중심의 교육이 이루어져야 한다. 따라서 본 논문에서는 현재의 단순한 간호 정보 지식 교육에서 정보 시스템 지식 습득 및 실습으로 변경될 것을 제안한다.

• 한국항해항만학회지
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• 제34권10호
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• pp.735-740
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• 2010

이 연구는 천수역에서 강한 바람과 조류하에 근접 항행중인 두 선박간의 상호유체력이 선박조종운동에 미치는 영향에 대해서 다룬다. 천수역에서 추월 및 피추월관계에 있는 대형선박의 조종운동은 바람, 조류 및 두 선박간의 상호유체력으로 인하여 상당히 복잡해진다. 이 연구의 목적은 안전항행을 위하여 천수역에서 강한 바람 및 조류하에 근접 항행중인 두 대형선박에게 요구되어지는 두 선박간의 속도에 따른 안전항과거리에 대해서 검토, 고찰하고자 한다.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2006년도 춘계학술대회 논문집
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• pp.399-400
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• 2006

LMTT(Linear Motor based Transfer Technology) is a new type of transfer system used in the maritime container terminal fur the port automation, and largely consists of a controller, shuttle car, and rail. The shuttle car is divided into the frame part, the driving part, and wheels. In order to design this system, various researches on each part of it must be conducted. In this study, we dealt with the optimum design for the frame part of the shuttle car designed from previous studies on the strength of the frame with respect to the number of cross beams to minimize the weight of the shuttle car and to satisfy design criteria of cargo-handling systems in container terminal. For the optimization of the frame, thicknesses of each beam were adopted as design variables, the weight of the frame as objective function, and stress and deflection per unit length as constraint condition.

• International Journal of Naval Architecture and Ocean Engineering
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• 제5권3호
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• pp.431-453
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• 2013

The principal purpose of this paper is to present a novel two phases rational scenario applied in constructing an offshore monopod platform; in which the two phases are the all-ground horizontal construction phase and the post-construction phase. Concerning the all-ground construction phase, a brief investigation of its different stages, i.e., pre-fabrication, fabrication, pre-assembling, positioning, assembling, and surface finishing is introduced. The important practical aspects of such construction phase are investigated without going into the nitty-gritty of the details involved therein. Concerning the post-construction phase, a clear investigation of its sequential stages, i.e., lifting, moving and up-righting is introduced. A finite element model (FEM) of the monopod platform is created to perform the structural analysis necessary to decide the suspension points/devices and the handling scenario during the various stages of the post-construction phase on a rational wise. Such structural analysis is performed within the framework of the three dimensional quasi-static modeling and analysis aiming at simulating the realistic handling condition, and hence introducing a reliable physical interpretation of the numerical results. For the whole effort to be demonstrated efficiently, the results obtained are analyzed, the conclusions are presented, and few related recommendations are suggested.

• 플랜트 저널
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• 제9권4호
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• pp.37-42
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• 2013

화력발전소와 같은 대규모 플랜트 설비는 복잡하여 고장이 발생할 경우 고장발생 설비, 시기 및 원인을 정확하게 파악하는 것이 쉽지 않기 때문에 무엇보다 고장을 사전에 예방하는 것이 중요하다. 최근 들어 정비업무에 대한 관점과 중요성이 점차 변화해 가고 있고 주기정비 방식에서 벗어나 상태기반 정비방식으로 발전되고 있다. 본 연구에서는 상태정비에 주안점을 두고 신뢰도중심정비 방법을 화력발전소, 특히 석탄취급설비에 적용하여 정비주기를 선정하고자 하였다.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2012년도 추계학술대회
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• pp.160-161
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• 2012

The traditional theory regarding the pivot point of a ship during maneuvering, so called apparent pivot point, is located nearly at 1/3 ship's length from the bow when the ship is moving ahead, and between 1/4 ship's length from the stern and the rudder post when going astern. The pivot point is sometimes considered to be the centre of leverage for forces acting on the ship. However, the pivot point is located out of ship due to strong lateral force, such as current and it is very inconvenient to use during maneuvering a ship. In this paper firstly, pivot points due to ship's condition are investigated carefully. And then the center of lateral resistance used at the present are determined. While a new lateral force is added, we can compare the pivot point with the center of lateral forces. Finally, we will suggest the center of all lateral forces for maneuvering instead of pivot point. Especially, it will be very helpful for pilots to handle ships in simulation.

• 한국어병학회지
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• 제7권2호
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• pp.161-171
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• 1994

뱀장어의 울혈증 발병 원인구명을 위하여 서해안 지역 5 개 양만장을 대상으로 아가미 울혈증 발병현황과 수질등 역학조사를 실시하였고, 한편으로는 스트레스(handling 과 수온차) 및 병어에서 분리한 아가미 마쇄액을 건강어의 복강에 주사하여 울혈증 발병률과 CHSE-214 에 접종하여 세포변성을 조사하였다. 조사한 양만장의 아가미 울혈증 발병률은 30-80%로서 사육시의 수온과 선별시의 수온차가 클수록 발병률이 높았으며, 수질환경과 본증의 발병과는 뚜렷한 상관관계가 없었다. 또한 발병률이 높은 양만장의 뱀장어는 Ht, Hb, Tp, Alb, Mg 및 Glu 치등이 낮은 반면 GOT, GPT, Ca 및 Met-Hb 치등은 높게 나타나는 경향을 보였으나, 반드시 아가미 울혈증에 비례하여 증감되지는 않았다. 스트레스(handling 과 수온차)를 가함에 따라 아가미 울혈증이 실험적으로 유발되어졌으며, 발병률은 50-70% 이었다. 이러한 스트레스 조건하의 어류의 혈액학적인 성상은 울혈증 발병빈도에 비례하여 Ht, GOT, GPT, Met-Hb, Alb 및 Glu 치등은 증가되었으나, Tp, Hb 및 Mg 은 감소하는 경향을 보였으며, 온도차가 클수록 cortisol 량이 증가되는 경향을 보였다. 그러나, 병어의 아가미 마쇄액을 복강주사 및 CHSE-214 에 접종하였던 바 각각 울혈증의 발병 및 세포변성이 전혀 관찰되지 않았다. 이러한 결과는 선별시 handling 과 수온의 급변이 혈중 cortisol을 상승시켜 혈액의 전해질 변화를 초래케하므로써 혈액의 흐름을 완만하게 되고 동정맥계로의 혈액유입량이 증가하게 되어 중심정맥동이 확장되므로써 울혈이 형성되는 것임을 시사한다.