• Journal of the korean society of oceanography
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• v.34 no.3
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• pp.179-183
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• 1999

A light-weight multiple piston corer to meet increasing coring needs in areas where R/V access is limited, is designed and discussed. Hydraulically-damped and spring-driven piston system not only virtually undisturbed surface sediments but also facilitate the recovery and subsequent operation including pore water extraction and core slicing on board the ship. It is designed as compact, light-weight and easy to dissemble that whole gear can be carried by small passenger vehicle yet it permits thick-walled core tube for thermal insulation or large opening core tubes. Because single spring instead of heavy weights of conventional gravity-driven multiple corers is used, this device is very simple and cheap to construct.

• Water Engineering Research
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• v.1 no.3
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• pp.187-197
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• 2000

This paper describes an adaptive quadtree-based 2DH wave-current interaction model which is able to predict wave breaking, shoaling, refraction, diffraction, wave-current interaction, set-up and set-down, mixing processes (turbulent diffusion), bottom frictional effects, and movement of the land-water interface at the shoreline. The wave period-and depth-averaged governing equations are discretised explictly by means of an Adams-Bashforth second-order finite difference technaique on adaptive hierarchical staggered quadtree grids. Grid adaptation is achieved through seeding points distributed according to flow criteria(e.g. local current gradients). Results are presented for nearshore circulation at a sinusoidal beach. Enrichment permits refined modelling of important localised flow features.

• Environmental and Resource Economics Review
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• v.11 no.1
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• pp.57-79
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• 2002

동 연구는 미국 캘리포니아주 San Joaquin Valley의 고정오염원들로부터 발생되는 ROG(Reactive Organic Gases) 배출량을 저감하기 위하여 명령통제방식(CAC)과 경제적 유인제도를 적용할 경우의 비용효과성을 비교 분석하였다. 경제적 유인제도로서는 UMPS(uniform marketable permit system)와 LMPS(localized marketable permit system) 배출권거래제도를 적용하였다. 분석결과 배출권거래제도(UMPS, LMPS)를 이용한 ROG 배출량 저감이 명령통제방식보다 비용이 적게 드는 것으로 나타났다. 한편, one-to-one permits trading이 허용되는 UMPS의 경우에는 일부 특정 지역에 대한 환경질이 악화되는 결과를 초래하는 경우가 발생하여, 궁극적으로 San Joaquin Valley의 ROG 배출량 저감을 위해서는 UMPS 방식의 배출권거래제도 도입이 보다 바람직한 것으로 나타났다.

• Applied Biological Chemistry
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• v.25 no.3
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• pp.182-188
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• 1982

A fluorometric method is described which permits the assay of trypsin inhibitor contained in a sample in an extremely small amount, utilizing a novel reagent generally called fluorescamine. The fluorometric assay with an enzyme kinetic approach has been found to be at least 100 times more sensitive than the well-known Kunitz's spectrophotometric method, considerably taster and less complicated, when it was demonstrated with the anti tryptic activities of very dilute extracts from soybean, red-bean and mung bean. Details of experimental procedure as well as theoretical considerations will be discussed.

• Journal of Energy Engineering
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• v.9 no.1
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• pp.68-75
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• 2000

본 연구에서는 비용효과적인 배출권거래를 모델화하여 온실가스 저감비용과 거래 이윤측면에서 한계설정이 배출권거래제에 미치는 영향을 분석하였다. 그 결과 한계저감비용곡선이 한 국가의 배출권거래 행태를 결정하는 주요요소이며, 배출권거래시장에참여하여 저감의무량의 일정분을 거래를 통해 의무를 이해하고 잔여량만을 자국의 기술력으로 저감하는 것이 비용효과적임을 확인하였다. 또한 배출권의 구매량을 제한하는 계설정은 배출권의 초과공급으로 거래가격이 낮게 형성되어 거래이윤이 구매측에 편중되었으며, 판매량 제한 또는 구매와판매 양측의 거래량을 제한할 경우는 반대로 배출권의 초과수요로 거래이윤이 판매측에 편중되는 것으로 나타났다. 그리고 거래량의 제한이 없는 경우에 가장 비용효과적인 배출권거래의 행태를 보였으나, 지구온난화에 대한 역사적 책임또는 형평성 문제, Hot air 거래등의 문제로 한계설정을 해야한다면, 구매와 판매량을 모두 제한함으로써 거래당사국들간의 이윤 편중을 완화하는 방안으로 모색해야 한다는 결론을 얻었다.

• Journal of The Korean Society of Agricultural Engineers
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• v.55 no.3
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• pp.1-7
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• 2013

The dam plan quantity of constructive and water supply quantity of present time are showing a difference with change in climate and augmentation of water demand for multipurpose dams in Nakdong river basin. But revaluates a water supply ability the method or the process is official for is not taking a position, so actual condition applies the plan quantity of dam constructive. Considers various situation of actual multipurpose dam from research sees consequently and in K-WEAP is an integrated water resources evaluation plan model applies as water permit availability multipurpose dam, currently water permit availability comparison, analyzed. In this study, the natural daily flow data and apply the dimensions of the reservoir, and for more than 30 years of the long-term water balance analysis conducted by Date Nakdong river basin can supply reservoirs are large quantity of permits available is presented.

• Proceedings of the KIEE Conference
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• 1988.07a
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• pp.971-974
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• 1988

In this study, we designed a model of NC controller with IBM-PC as a host CPU and intelligent servo controller for 2 axes that can be expaned to 4 axes. OS software was developed with C language at the base of mode selection technic for 9 NC operating modes. Servo controller design was based on the application of interpolator IC(3701) and position controller IC(3702) that permits low cost and high performance. For connection of two systems, parallel I/O communication was implemented. Finally, auto interpolation program test was executed for linear and circular paths resulting 1 LSB accuracy.

• Journal of Communications and Networks
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• v.17 no.3
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• pp.256-264
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• 2015

Energy harvesting devices have been proposed for sensor networking applications where batteries cannot be replaced, and cooperative communication schemes have been used to increase energy efficiency for wireless systems. Here, we develop transmission scheduling schemes for multi-terminal cooperative energy harvesting networks that maximize the packet delivery ratio, i.e., the probability that an event is reported successfully. We see that the proposed scheme provides virtually the same performance as the state-of-the-art threshold-based scheme, but does not require auxiliary parameter optimization. The proposed scheme also permits extensions to multiple cooperating nodes and sources, and it can be modified to accommodate fairness constraints.

• The Transactions of the Korean Institute of Electrical Engineers D
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• v.54 no.4
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• pp.235-242
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• 2005

In this paper, we consider the H$\infty$ tracking control of linear system with a limited actuator capacity. The considered reference is a general time-varying one with bounded magnitude and rate. By adopting a similarity transform and a new sto variable, we convert the original system equation to new one which has a tracking error as a part of the new state variable. First, we obtain a result on the low-gained H$\infty$ tracking control which never permits the actuator saturation. Next, we give a result on scheduled H$\infty$ tracking control which uses the actuator capacity more effectively. All results are in the form of linear matrix inequalities(LMI) which can be easily checked their feasibility. Finally, we give a numerical example to show the validity and usefulness of our results.

• Proceedings of the KIEE Conference
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• 1994.07a
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• pp.243-245
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• 1994

A PWM forced-commutated converter with DC voltage source is studied in this paper. This PWM-VSC using spacs vector modulation permits to control bi-directional power exchange between the AC mains and the DC source. The principle of the active and reactive power control is presented. In transient operation, the analysis of reactive component current is performed. Finally, the simulation results are also presented and discussed.