• 생약학회지
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• 제40권3호
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• pp.161-164
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• 2009

'NuRo (漏蘆)' is one of the crude drugs which has been used for removal of fever and skin disease. With regard to the botanical origin of 'NuRo', it has been considered to be Echinops species of Compositae, but there has no pharmacognostical confirmation on it. To clarify the botanical origin of 'NuRo', the anatomical characteristics of the root of Echinops latifolius and E. setifer were studied. As a result, it was clarified that 'NuRo' from Korea was the root of Echinops setifer.

• 대한조선학회논문집
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• 제41권5호
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• pp.48-54
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• 2004

The present study investigates the fire development characteristics on a Ro-Ro ferry vehicle using the modified FDS code considering droplet break-up. Numerical simulations are compared with model-scale tests for validation of field model. The predicted results such as smoke layer temperature and oxygen concentration are in good agreement with model-scale tests. Also, it is shown that water spray systems are very effective to control the fire development on a vehicle deck. These numerical simulations using a field model may be helpful in accomplishing the fire safety for marine vehicle.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2001년도 추계학술대회논문집 II
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• pp.1050-1054
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• 2001

Relatively high rotating speed propulsion shafting system of the large Ro-Ro Ferry has a greate risk of the resonance of the many wide local panels as well as the high frequency global vibratory modes. Therefore, from the initial design stage, it is necessary to control the vibration characteristics of the wide panels with detail so as not to be resonant with the blade number order excitation due to the propellers in the normal operating speed range. The procedure of the vibration analysis and the structural redesign for prevention of vibration is introduced.

• Journal of Industrial and Engineering Chemistry
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• 제67권
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• pp.52-71
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• 2018

RO membranes, the core elements for RO process formed using polyamide, have found prominent space in membrane technology. RO membranes with better application perspective could be achieved by precise controlling the kinetics of IP reaction and surface modification strategy. Despite huge progresses, great challenges still exist in trade-off between flux, rejections and fouling. More works are necessary to enhance the performance and stability of RO membranes via surface modification. Further insights into the use of natural monomers are necessary. It is anticipated that this article can provide clues for further in-depth evaluation and research in exploring more advanced RO membranes.

• 한국정보과학회 언어공학연구회:학술대회논문집(한글 및 한국어 정보처리)
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• 한국정보과학회언어공학연구회 2020년도 제32회 한글 및 한국어 정보처리 학술대회
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• pp.486-490
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• 2020

키워드 구문 추출(Keyphrase extraction)은 각 문서에서 내용과 주제를 포괄하는 핵심 단어 또는 구문을 추출하는 것을 말한다. 이는 뉴스나 논문에서 중요한 정보를 추출하는 데 매우 중요한 역할을 한다. 본 논문에서는 기존 catSeq 모델에 한국어로 학습한 RoBERTa 언어 모델을 적용하고 개체 연결 정보를 활용해 기존 키워드 생성 디코더와 개체 연결된 단어의 키워드 여부 분류 디코더, 즉 듀얼 디코더를 사용하는 모델을 제안하고 직접 구축한 한국어 키워드 추출 데이터에 대한 각 모델의 성능을 비교한다.

• 한국막학회:학술대회논문집
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• 한국막학회 2002년도 제10회 하계 Workshop
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• pp.1-12
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• 2002

Desalination by reverse osmosis (RO), which first entered commercial use in the 1970s, was initially mainly used for treating brackish water. Technological progress led to the development of an RO membrane enabling single-pass seawater desalination. Toyobo succeeded in developing a single-pass seawater desalination RO module composed of hollow fiber type membranes made of cellulose triacetate in 1978, and then in 1979 began production of the first commercially available double-element module. This double-element module has many advantages suitable for seawater desalination. It has high chlorine tolerance and high salt rejection, derived from the properties of the membrane material, and it is highly resistant to fouling and scaling matters due to the unique flow pattern and fiber bundle configuration. These advantages help to explain why the Toyobo double-element module has been used so successfully at the many seawater desalination plants around the world. Since the 1980s, large plants capable of desalinating several tens of thousands of cubic meters a day have sprung up around the Mediterranean and In the Middle East. The Jeddah RO Phase I Plant, which has a capacity of 56, 800m$^3$/day, went into operation in 1989. In 1994, the same sized Phase II Plant came on stream, giving the plant a huge total capacity of 113, 600m$^3$/day. The plant constructor Mitsubishi Heavy Industries, Ltd. (MHI), and the RO membrane manufacturer Toyobo Co., Ltd. In 1998, the world's largest RO seawater desalination plant in operation, which has a capacity of 128, 000m$^3$/day and is run by Saudi Arabia's Saline Water Conversion Corporation (SWCC), went into operation at Yanbu. RO seawater desalination technology has thus already reached the stage of full-scale commercial use. In order to encourage its wider use, however, RO desalination needs to be made more economical by lowering construction and water treatment costs. Toyobo has therefore developed a new economical RO desalination system by a recovery ratio of 60% using a high-pressure module with a high product flow rate. In 2000, Toyobo high recovery membrane module was selected for the largest seawater desalination plant in Japan, which has a capacity of 50, 000m$^3$/day.

• 상하수도학회지
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• 제29권6호
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• pp.601-608
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• 2015

Pollutants removal efficiency in pretreatment(GAC filter, multi-media filter, disk filter) and RO facilities was investigated for the Jeju Samyang spring water source where raw water intake has been stopped due to sea water intrusion. In addition, preliminary feasibility analysis was conducted between RO and groundwater intake systems. Turbidity removal in 4 different pretreatment processes was less than 25% due to low concentration of turbidity(i.e., less than 0.21 NTU), while multi-media filter is recommended for the pretreatment facility based on the low organic content in raw water as well as cheaper operation and maintenance cost. The average concentration of $Cl^-$ in raw water was 691.4 mg/L, while that of RO permeate was 9.1 mg/L(i.e., removal efficiency was 98.4%). In addition, TDS removal efficiency was 98.1%, which was quite high. The production cost for RO system($Q=4,000m^3/d$) was $362.1won/m^3$ considering installation, operation and maintenance cost for 30 years. While that of groundwater was $262.6won/m^3$ which was low compared to the RO system. However, it is recommended to introduce RO system for Samyang water source rather than new groundwater development because Samyang water source has been discharged to the sea without any usage, while groundwater can be used for other purpose as a sustainable water source.

• 한국통신학회논문지
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• 제29권7A호
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• pp.786-793
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• 2004

cdma2000 IxEV-DO 네트워크의 역방향 링크에서와 같은 자율적 전송률 제어 (ARC, Autonomous data Rate Control) 구조는 다중 QoS 환경에서의 다양한 QoS 보장 및 RoT (Rise over Thermal) 제약 조건을 만족시키지 못하는 문제가 있다. 이에 따라, 본 논문에서는 cdma2000 기반의 역방향 링크 시스템을 위한 자원 관리 기술로서, MWGF (Modified Weighted G-Fair) 스케줄러를 제안하고, 다중 QoS 서비스 환경에서 성능을 분석하였다. 제안된 스케줄러는 QoS 요구를 고려한 우선 순위를 제공할 뿐만 아니라 RoT-filling 기법을 이용해서 RoT 정규화를 보장함으로서 CDMA 시스템의 로딩 (loading)을 유지하는 구조로 설계되었다. 모의실험을 통하여, 제안된 스케줄러는 자율적 전송률 제어 구조에 비하여, 약 29 - 40 % 정도의 실시간 서비스의 전송 시간이 단축되는 것을 보였으며, 약 1.0 - 1.3 dB의 낮은 평균 수신 RoT 레벨을 유지하여 낮은 시스템 로딩을 제공함을 보였다. 이와 같은 낮은 시스템 로딩은 여분의 간섭량을 타 서비스 또는 타 셀에 제공하여 시스템 전체의 용량을 증가시킬 수 있게 된다.

• Membrane and Water Treatment
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• 제11권5호
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• pp.323-331
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• 2020

With the increasing demand on reverse osmosis (RO) membranes for water purification worldwide, the number of disposed membrane elements is expected to increase accordingly. Thus, recycling and reuse of end-of-life RO membranes should be a global environmental action. In this work, we aim to reuse the spent RO membrane for nanofiltration (NF) and ultrafiltration (UF) process by subjecting the spent membrane to solvent and oxidizing solution treatment, respectively. Our results showed that solvent-treated RO membrane could perform as good as commercial NF membrane by achieving similar separation efficiencies, but with reduced water permeability due to membrane surface fouling. By degrading the polyamide layer of RO membrane, the transformed membrane could achieve high water permeability (85.6 L/㎡.h.bar) and excellent rejection against macromolecules (at least 87.4%), suggesting its reuse potential as UF membrane. More importantly, our findings showed that in-situ transformation on the spent RO membrane using solvent and oxidizing solution could be safely conducted as the properties of the entire spiral wound element did not show significant changes upon prolonged exposure of these two solutions. Our findings are important to open up new possibilities for the discarded RO membranes for reuse in NF and UF process, prolonging the lifespan of spent membranes and promoting the sustainability of the membrane process.

• 한국실내디자인학회논문집
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• 제19권6호
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• pp.241-248
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• 2010

The population of the elderly is rapidly increased because maturation of the social welfare system and development of medical technology. However, welfare environments for the elderly are poor either in its quality or its quantity. The aims of this study is to confirm the space improvement possibility to change the Gyung Ro Dang to the senior life support center as a community welfare service network. This study is done by the comparative analysis between existing Gyung Ro Dang in korea and former cases in Japan based on the elderly's facility preference. The facility's space reprogramming alternative from that analysis is applied to change the Gyung Ro Dang to a network facility for the regional senior life support. Afterward, it is proposed that first, facilities should be expanded scale by the new education and health improvement facilities functional room that the modern elderly need. second, Facility space will be reconstitution because the Gyung Ro Dang have to be extended it's role as a community welfare network.