• 의료ㆍ복지 건축 : 한국의료복지건축학회 논문집
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• 제23권4호
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• pp.37-53
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• 2017

Purpose: As the structure of the disease has been changed and the infectious disease has been increased, the demand for diagnostic examination has been increasing. So, the department of laboratory medicine in hospital has playing the important role accounting for about nineteen percent of total medical expenses in korea. This study is to investigate the laboratory function and spatial composition of the department and figure out the space area and space organization. Methods: Explore the literature review to identify the laboratory function. Limit to five cases of tertiary level general hospital having about a thousand bed and analyze the space layout and floor area to confirm the spatial composition. Classify the exam function and check the spatial composition and spatial organization. Results: This study allows 5 conclusions to be summarized. Laboratory medicine divided into nine part in regulation, but in space allocated into core lab, emergency lab and six part lab. Total laboratory area is $2,036m^2$ in average, and is composited with 60% for lab, 17% for office and 20% for public. Lab area per a bed presents $1.88m^2$. Microbiolgy and molecular lab area are getting large. Laboratory space organized into the four zone, like an entrance zone, core zone, rear zone and peripheral zone. Emergency and transfusion lab are allocated in entrance zone, hematology chemistry and immunology in core lab, microbiology and molecular lab in rear, support offices in peripheral zone. The most important point was to check the spatial composition of the Laboratory Medicine according to the inspection function. Implications: This study can be used as a useful data in planning and designing a Laboratory Medicine Department.

• 한국세라믹학회지
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• 제43권5호
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• pp.315-319
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• 2006

There have been some studies on the use of coal waste as a raw material for clay bricks due to the lack of naturally producing minerals. It can help resolving the problems of pollution, forest conservation and flood control by utilizing coal waste. However, high content of carbon materials usually leads to the black core in clay bricks after firing process, and diminishes the mechanical and aesthetical properties of clay brick. In this study, the effect of firing process is investigated for the removal of black core in clay bricks with carbon content. The removal kinetics of black core are also compared and investigated with the firing schedule and black core removal.

• 한국분말재료학회지
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• 제17권4호
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• pp.295-301
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• 2010

Multi shell graphite coated Ag nano particles with core/shell structure were successfully synthesized by pulsed wire evaporation (PWE) method. Ar and $CH_4$ (10 vol.%) gases were mixed in chamber, which played a role of carrier gas and reaction gas, respectively. Graphite layers on the surface of silver nano particles were coated indiscretely. However, the graphite layers are detached, when the particles are heated up to $250^{\circ}C$ in the air atmosphere. In contrast, the graphite coated layer was stable under Ar and $N_2$ atmosphere, though the core/shell structured particles were heated up to $800^{\circ}C$. The presence of graphite coated layer prevent agglomeration of nanoparticles during heat treatment. The dispersion stability of the carbon coated Ag nanoparticles was higher than those of pure Ag nanoparticles.

• 한국원자력학회:학술대회논문집
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• 한국원자력학회 2005년도 춘계학술발표회
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• pp.19-20
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• 2005

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제12권6호
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• pp.2492-2512
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• 2018

Multicast communication can effectively reduce network resources consumption in contrast with unicast. With the advent of SDN, current researches on multicast traffic are mainly conducted in the SDN scenario, thus to mitigate the problems of IP multicast such as the unavoidable difficulty in traffic engineering and high security risk. However, migration to SDN cannot be achieved in one step, hybrid SDN emerges as a transitional networking form for ISP network. In hybrid SDN, for acquiring similar TE and security performance as in SDN multicast, we redirect every multicast traffic to an appropriate SDN node before reaching the destinations of the multicast group, thus to build up a core-based multicast tree substantially which is first introduced in CBT. Based on the core SDN node, it is possible to realize dynamic control over the routing paths to benefit traffic engineering (TE), while multicast traffic manageability can also be obtained, e.g., access control and middlebox-supported network services. On top of that, multiple core-based multicast trees are constructed for each multicast group by fully taking advantage of the routing flexibility of SDN nodes, in order to further enhance the TE performance. The multicast routing and splitting (MRS) algorithm is proposed whereby we jointly and efficiently determine an appropriate core SDN node for each group, as well as optimizing the traffic splitting fractions for the corresponding multiple core-based trees to minimize the maximum link utilization. We conduct simulations with different SDN deployment rate in real network topologies. The results indicate that, when 40% of the SDN switches are deployed in HSDN as well as calculating 2 trees for each group, HSDN multicast adopting MRS algorithm can obtain a comparable TE performance to SDN multicast.

• 전력전자학회논문지
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• 제22권1호
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• pp.9-17
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• 2017

A parallel control algorithm of thyristor dual-converter power system for the DC power supply of railway is proposed. The circulating current and current imbalance generated during parallel operation can be limited to control the output voltage of each power system by using the proposed parallel control algorithm. The proposed control algorithm can also eliminate output current sensor to achieve the same output response without additional costs. The validity of the proposed algorithm is verified through simulation and experiment.

• 한국추진공학회지
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• 제18권2호
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• pp.67-72
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• 2014

본 연구에서는 HTPB에 보강제로 Carbon black이 충전된 라이너의 점도, 기계적 특성, 추진제와의 접착력을 고찰하였다. Carbon black이 충전된 라이너는 점도가 높아 수평원심 주조 방법으로 라이닝에 문제가 있었다. 이 문제점을 해결하기 위해 프리믹스를 $60^{\circ}C$에 6일 숙성시킴으로써, 점도 464 posie에서 200 posie로 감소시킬 수 있었다.

• 전력전자학회논문지
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• 제20권6호
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• pp.573-579
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• 2015

A control algorithm of thyristor dual converter power system is proposed in this study for a railway power substation. The thyristor dual converter can use regenerative power without an additional system using control algorithm. An autonomous voltage and mode change method is also proposed to provide uninterrupted power to the railway. A 10 kW reduced model of the thyristor dual converter power system is built and tested to verify the validity of the proposed control algorithm.

• 한국광학회지
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• 제16권1호
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• pp.79-84
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• 2005

정력 오차 허용 범위를 증가 시켜서 효과적인 수동정렬이 가능토록 하기 위한 단일 모드 대형 코어 폴리머 광도파로를 구현하였다. 대형 코어 광도파로는 TEC(thermally expanded core) 광섬유의 모드와 일치하는 큰 도파모드를 가진다. 이로 인해 광섬유와 도파로의 정렬오차로 인한 모드 결합 손실을 줄일 수 있게 된다. 코어와 클래딩의 굴절률 차이가 5 ${\times}$ $10^{-4}$ 인 폴리머 재료를 이용하여 25 ${\times}$ 25 $\mu\textrm{m}$$^2$ 크기의 정사각형 광도파로를 제작하였으며 도파모드 관측결과 단일모드로 동작함을 확인하였다. 이와 같이 두꺼운 형태의 광도파로 구조 제작을 위하여 자외선 경화를 이용한 인젝션 몰딩(injection molding) 공정을 사용하였다. 제작된 광도파로 소자를 TEC 광섬유와 정렬연결을 할 때 정렬오차가 4.5 $\mu\textrm{m}$ 까지 증가하더라도 삽입손실 증가는 0.5 dB 이하고 유지됨을 확인하였다.

• Macromolecular Research
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• 제16권1호
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• pp.21-30
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• 2008

Based on the sheath-core bicomponent composite fibers with modified polystyrene (PS) and the modified polypropylene (PP), composite fibers obtained were further cross-linked and sulphonated with chlorosulphonic acid to produce strong acidic cation ion exchange fibers. The structures of the fibers obtained were characterized using Fourier transform infrared (FT-IR) spectroscopy, differential scanning calorimetry (DSC) etc. The optimal technology of the fibers obtained is discussed. The static absorption capacity of the sheath-core bicomponent composite cation exchange fibers for $Zn^{2+}$, $Cu^{2+}$ was determined. The absorption kinetics and major factors affecting the absorption capacities of $Zn^{2+}$, $Cu^{2+}$ were studied, and its chemical stability and regenerating properties were probed. The results suggest that cation exchange fibers with better mechanical properties and higher exchange capability were obtained. Moreover, this type of ion exchange fiber has good absorption properties and working stability to various metal ions. Hence, they have higher practicability.