• 한국실내디자인학회논문집
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• 제19권5호
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• pp.83-94
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• 2010

Conventionally, ornament has developed around linear thinking based on Euclidean geometry, and been explained as simple and lucid natural Euclidean geometrical phenomena. The modular arrangement with vertical, horizontal and diagonal grids has been an organizing principle of classical ornament, but in digital era ornament is found not to be explained only with the principle of traditional arrangement due to the seemingly irregular complex forms. In that sense, this study presents the concept of digital ornament and examined the backgrounds of ornament in digital age, that are complex system and non-Euclidean geometry. Accordingly, the present study takes an approach by dividing new formal types of ornament into algorithmic form, hybrid form and dynamic form to find out a principle of pattern organization. Lately, architects who actively use computer for their architectural designs take the algorithmic strategies in nature and create various and complex patterns by simple rules. The patterns are not the repetition of the same, but the production of singularities. In addition, hybrid form by morphing shows a topologically flexible evolutionary transformation, and is used to create in-between transitional shapes from the source to target. Finally, the patterns by the interaction between the system components which are corresponded to the embedded forces emerge from dynamic simulation of the natural environment. Rather than objects itself, focus is given to the process of generating forms, and the ornamental patterns as the revelation of such implicit order provide not just the formal beauty but also spatial pathways for lights and air, maximizing the effects of lights.

• 한국국방경영분석학회지
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• 제33권1호
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• pp.1-18
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• 2007

본 연구의 목적은 비교항목들의 척도가 서로 상이하고 측정치를 산정하기 곤란한 대안들의 의사결정시 대안 비교를 과학적으로 할 수 있는 지식기반 대안분석모델(KAAM)을 제안하는 것이다. KAAM은 기존의 방법인 Saaty, Delphi/Shang, Consensus, SAW 기법을 근간으로 하는 하이브리드 방식으로 구성되고 엑셀기반으로 구현하였다. 또한, 무기체계 획득사업의 사전분석 단계에서 최적 획득방안을 선정하는 실증적 사례를 적용함으로서 KAAM의 유용성을 확인하였다.

• 한국초지조사료학회지
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• 제27권4호
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• pp.275-280
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• 2007

본 시험은 유기조사료 생산에 적합한 동 하계 사료작물을 선정하고, 이를 통한 지역별 유기조사료 생산을 위한 적정 작부체계를 선발하기 위하여 수행되었다. 관행재배 조건과 유기재배 조건에서의 사료작물별 생육특성의 차이는 하계사료작물에서 현저하게 나타났다. 즉 사료용 옥수수는 잡초 발생으로 생육이 억제되어 관행재배에 비해 현저한 수량감소를 나타낸 반면 수수$\times$수단그라스 교잡종은 잡초 발생이 없어 관행 옥수수 대비 높은 수량을 나타내었다. 동계사료작물은 관행재배와 유기재배에 의한 차이는 크지 않았으나, 생산성 측면에서 이탈리안 라이그라스 보다 호밀이 우수하였다. 따라서 작부체계에 영향을 미치는 요인이 하계 사료작물에서는 잡초의 발생여부, 동계사료작물에서는 사료작물의 종류에 기인됨이 밝혀졌다. 이를 종합적으로 고려한 중부지역에서 유기조사료 생산을 위한 최적 작부체계는 중부지역에서는 수수$\times$수단그라스와 호밀이라 할 수 있다.

• Industrial Engineering and Management Systems
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• 제8권1호
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• pp.14-21
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• 2009

We formulate a mathematical model of remanufacturing system as multi-stage reverse Logistics Network Problem (mrLNP) with minimizing the total costs for reverse logistics shipping cost and inventory holding cost at disassembly centers and processing centers over finite planning horizons. For solving this problem, in the 1st and the 2nd stages, we propose a Genetic Algorithm (GA) with priority-based encoding method combined with a new crossover operator called as Weight Mapping Crossover (WMX). A heuristic approach is applied in the 3rd stage where parts are transported from some processing centers to one manufacturer. Computer simulations show the effectiveness and efficiency of our approach. In numerical experiments, the results of the proposed method are better than pnGA (Prufer number-based GA).

• Korean Membrane Journal
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• 제2권1호
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• pp.1-8
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• 2000

In Kimchi (a salt-pickled and fermented food) manufacturing industry, the process of brining and rinsing the raw vegetable produces a vast amount of wastewater of high salinity. Instead of expensive and low-efficient conventional treatment system, brining wastewater reuse system was developed using hybrid chemical precipitation/microfiltration. In the microfiltration of chemically treated brining wastewater, comparison of flux, backwashing frequency and energy consumption was made between dead-end and crossflow filtration mode. The optimum location of neutralization step in this system was also discussed in connection with the microfiltration performance. The quality test of Kimchi prepared by the reuse system confirmed the new approach was successful in terms of water/raw material(salt) saving and wastewater reduction.

• 한국막학회:학술대회논문집
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• 한국막학회 1999년도 심포지움시리즈 Jan-99 막분리공정을 이용한 재활용 기술
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• pp.1-12
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• 1999

In Kimchi (a salt-pickled and fermented food) manufacturing industry, the process of brining and rinsing the raw vegetable produces a vast amount of wastewater of high salinity. Instead of expensive and low-efficient conventional treatment system, brining wastewater reuse system was developed using hybrid chemical precipitation / microfiltration. In the microfiltration of chemically treated brining wastewater, comparison of flux, backwashing frequency and energy consumption was made between dead-end and crossflow filtration mode. The optimum location of neutralization step in this system was also discussed in connection with the micro filtration performance. The quality test of Kimchi prepared by the reuse system conformed the new approach was successful in terms of water/raw material (salt) savings and wastewater reduction.

• 대한산업공학회지
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• 제33권3호
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• pp.312-321
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• 2007

We address a disposal issue of returned products in a product recovery system where a single product is stocked in order to meet a demand from customers who may return products after usage. Product returns occur randomly and can be accepted for remanufacturing or disposed of depending on the state of the system. We examine the structure of the optimal disposal policy for returned product that utilizes the information of the inventory of both serviceable and remanufacturable products. Numerical study indicates that it can be characterized by a monotonic threshold type of the curve. A disposal is allowed only when the remanufacturable inventory level exceeds a threshold which is the function of the inventory level of serviceable product and it is decreasing as the serviceable inventory level increases. Sensitivity analysis also indicates that the optimal disposal policy and the optimal profit have monotonic properties with respect to system parameters.

• 국토계획
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• 제53권7호
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• pp.67-86
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• 2018

This paper attempted to analyze impacts of transition in electricity generation system on a national economy and environmental level in Korea using a recursive computable general equilibrium(CGE) model. In particular, the paper presented a hybrid model combining the top-down CGE model with the bottom-up model which describes the structure of electricity production in detail. The impacts were analyzed by two policy scenarios base on the basic plan for electricity supply and demand proposed by the Korean government. As a result, the paper specifically showed that there exists a trade-off relationship in the policy-making between economic efficiency and environmental level. The paper also suggested that the transition in electricity generation system should be done more gradually and carefully.

• Nuclear Engineering and Technology
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• 제34권1호
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• pp.42-59
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• 2002

In order to transmute long-lived radioactive nuclides such as transuranics(TRU), Tc-99, and I- l29 in LWR spent fuel, a preliminary conceptual design study has been performed for the accelerator driven subcritical reactor system, called HYPER(Hybrid Power Extraction Reactor) The core has a hybrid neutron energy spectrum: fast and thermal neutrons for the transmutation of TRU and fission products, respectively. TRU is loaded into the HYPER core as a TRU-Zr metal form because a metal type fuel has very good compatibility with the pyre- chemical process which retains the self-protection of transuranics at all times. On the other hand, Tc-99 and I-129 are loaded as pure technetium metal and sodium iodide, respectively. Pb-Bi is chosen as a primary coolant because Pb-Bi can be a good spallation target and produce a very hard neutron energy spectrum. As a result, the HYPER system does not have any independent spallation target system. 9Cr-2WVTa is used as a window material because an advanced ferritic/martensitic steel is known to have a good performance under a highly corrosive and radiation environment. The support ratios of the HYPER system are about 4∼5 for TRU, Tc-99, and I-129. Therefore, a radiologically clean nuclear power, i.e. zero net production of TRU, Tc-99 and I-129 can be achieved by combining 4 ∼5 LWRs with one HYPER system. In addition, the HYPER system, having good proliferation resistance and high nuclear waste transmutation capability, is believed to provide a breakthrough to the spent fuel problems the nuclear industry is faced with.

• 한국육종학회지
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• 제41권3호
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• pp.213-219
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• 2009

본 연구는 나리의 종간잡종 육성체계를 확립하는데 필요한 기초자료를 얻기 위하여 OA hybrid 중 자발적으로 생식세포 염색체가 배수화된 계통을 이용하여 후대 획득과 후대검정에 필요한 실험을 수행하여 얻은 결과를 요약하면 다음과 같다. 2n 화분을 생산하는 OA hybrid의 경우 화분의 채취시기에 따른 생존율과 발아율은 10월에 비해 6월이, 생존율은 n성 화분이, 발아율은 2n성 화분이 높았다. 2n 화분을 생산하는 2배체 OA hybrid와 2배체 또는 4배체 Asiatic 또는 Oriental hybrid간 교배시 모본과 부본을 달리함에 따라 후대 획득 수에 차이가 있었는데 OA hybrid를 부본으로 이용했을 때, 상대친을 Asiatic hybrid로 교배했을 때 후대획득이 용이하였다. 즉 A$\times$OA교배에서 후대 획득률이 0.64개체로 O$\times$OA교배에서의 후대 획득률 0.42개체보다 높았으며, OA$\times$A간 교배에서 후대 획득률이 0.40개체인 반면 OA$\times$O교배에서는 전혀 후대획득이 불가능하거나 극히 낮아 후대획득이 어려웠으며, 아울러 2n 화분을 생산하는 OA hybrid의 후대생산을 위한 상대친으로 4배체보다는 2배체가 효과적이었다. 2n 화분을 생산하는 OA hybrid와 Asiatic 또는 Oriental hybrid간 정역교배 결과, OA hybrid를 부본으로 교배했을 때, 상대친으로 Asiatic hybrid을 교배했을 때 후대획득이 용이하였다. 자발적인 2n 화분을 생산하는 2배체 OA hybrid의 여교잡 후대의 ploidy level의 측정결과, OA$\times$A교배에서는 3배체, AA$\times$OA, OO$\times$OA교배에서는 4배체임을 확인할 수 있었으나, O$\times$OA교배에서는 2배체, A$\times$OA교배에서는 2배체 또는 3배체로 확인되었다.