• 제목/요약/키워드: challenge

검색결과 5,278건 처리시간 0.032초

Gastric Cancer Presenting as a Krukenberg Tumor at 22 Weeks' Gestation

  • Co, Paul Vincent;Gupta, Ashutosh;Attar, Bashar M.;Demetria, Melchor
    • Journal of Gastric Cancer
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    • 제14권4호
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    • pp.275-278
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    • 2014
  • Gastric cancer is rare during pregnancy, and often advanced upon presentation. A Krukenberg tumor presents a diagnostic and therapeutic challenge in the pregnant patient. We present a case of a 38-year-old woman at 22 weeks' gestation who presented with worsening epigastric pain, and was found to have a left pelvic mass on ultrasound, which was confirmed by magnetic resonance imaging. She went into active labor and delivered a viable infant via vaginal delivery. An exploratory laparotomy revealed a large mass originating from her left ovary and diffuse thickening of the lesser curvature of the stomach. Frozen section investigation revealed the presence of signet cell adenocarcinoma. Subsequent upper endoscopy showed linitis plastica, while biopsy confirmed the presence of adenocarcinoma. In conclusion, the occurrence of gastric cancer in pregnancy is rare despite extremely common symptoms. The management poses a challenge because of the need for early treatment, and the continuation of the pregnancy.

DRC 휴보의 4족 보행 제어 (Quadruped Walking Control of DRC-HUBO)

  • 김정엽
    • 한국생산제조학회지
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    • 제24권5호
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    • pp.548-552
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    • 2015
  • In this paper, we describe the quadruped walking-control algorithm of the complete full-size humanoid DARPA Robotics Challenge-HUBO (DRC-HUBO) robot. Although DRC-HUBO is a biped robot, we require a quadruped walking function using two legs and two arms to overcome uneven terrains in the DRC. We design a wave-type quadruped walking pattern as a feedforward control using several walking parameters, and we design zero moment point (ZMP) controllers to maintain stable walking using an inverted pendulum model and an observed-state feedback control scheme. In particular, we propose a switching algorithm for ZMP controllers using supporting value and weighting factors in order to maintain the ZMP control performance during foot switching. Finally, we verify the proposed algorithm by performing quadruped walking experiments using DRC-HUBO.

연료극과 공기극 유로의 겹침이 PEMFC 성능에 미치는 영향 (An Effect of the Overlapping with the Anode and Cathode Flow Channel to PEMFC Performance)

  • 이지홍;이명용;이상석;이도형
    • 신재생에너지
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    • 제5권1호
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    • pp.18-25
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    • 2009
  • PEMFC (Proton Exchange Membrane Fuel Cell) is a low temperature fuel cells which are high efficient and clean energy. But it has many problems like economical efficiency or durability. Because of this reason, many researchers challenge various view points. One of challenge is the flow channel design and many researchers develop new flow channel design. In addition to most of them have the anode and cathode's flow channel overlapped almost perfectly. In this case, the electrochemical reaction is almost done by the inertial force of flow. So we study on the effect of the anode and cathode's flow channel which aren't overlapped perfectly, have more diffusion effect, to PEMFC performance using CFD.

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Seaweed Cultivation in Indonesia: Recent Status

  • Pambudi, Lilik Teguh;Meinita, Maria Dyah Nur;Ariyati, Restiana Wisnu
    • 한국해양바이오학회지
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    • 제4권1호
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    • pp.6-10
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    • 2010
  • Indonesia is well-known as biggest producer of seaweed especially for Eucheuma and Gracilaria and also has huge potential resources and capability to develop seaweed cultivation and product. There are several provinces which have potential resources and have been contributing on seaweed production. The next challenge about seaweed production is using integrated system on brackishwater and marine aquaculture. Furthermore, about 2,000,000 ton of potential seaweed production is not explored yet. This article also tries to figure out some related aspects which are technical, economical and forecasting aspect. There is a disease which named "ice-ice" is one of the main problem and giving a new challenge in developing of problem solving for seaweed cultivation method. Economical parameters are also main important key to find out the feasibility of seaweed cultivation industry. In addition, the seaweed cultivation and production in Indonesia also have potential performance on biofuel resources as a part for solving the world problem on energy demand.

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A Survey on Popular Human Factors in Agile Environment

  • Abidin, Faten Alia Zainal;Ghani, Imran
    • International Journal of Internet, Broadcasting and Communication
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    • 제8권3호
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    • pp.78-91
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    • 2016
  • Various studies have proven that human is the biggest challenge in the process of transitioning to agile. Culture and mindset are two critical elements of human factors causing issues in agile environment. This study involved thirty-two (32) agile practitioners from nineteen (19) country to validate the issues from human factors. The purpose of the study is to discover human factors that required more attention and factors that give a low impact on the agile environment. Furthermore, this paper presents research analysis on some of popular human factors such as collaboration, hierarchy, communication and other critical factors which company may face. The results of this analysis can be used as a guide for IT organization to consider the critical challenges they may encounter.

중국 제초제 저항성 논잡초 발생 현황 및 대책 (Herbicide Resistance Challenge in Paddy Field of China)

  • 오명근;서봉;양덕량;양걸
    • 한국잡초학회지
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    • 제32권3호
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    • pp.170-173
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    • 2012
  • China is one of most important countries for production and consumption of herbicide. Although the chemical weeding technology promoted the development of agricultural modernization in Chinese, it led to the negative effects to agriculture. In particular, the weeds resistant herbicide in paddy field had been serious challenge for safe production of rice. The chemical control technology for weed resistant herbicide with effective, low cost and safety characteristic will be key problem being solved in futhure.

영아의 기질 및 어머니에 대한 애착과 상황에 따른 모-영아의 상호작용간의 관계 (The Relationships Between Infant's Temperament and Infant's Attachment to Their Mothers, and Mother-Infant Interaction Across Situations)

  • 한지현;이영환
    • 아동학회지
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    • 제26권6호
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    • pp.287-303
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    • 2005
  • The purpose of this study was to describe infant and mother behaviors across situations. And, it was to examine the associations between infant's temperament and infant's patterns of attachment to their mother with mother-infant interaction. Results showed that there were significant main effects for the attentional focus of the situation and the level of regulatory challenge on observed mother-infant interaction behaviors. Also, mother and infant showed significant differences in their interaction behaviors depending on the patterns of infant temperzment and the patterns of infant-mother attachment.

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Creative Apparel Design Process Approach Using Architectural and Artistic Influence

  • McRoberts, Lisa Barona;Freeman, Charles Edward;Thibodeaux, Julianne
    • International Journal of Costume and Fashion
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    • 제15권2호
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    • pp.79-91
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    • 2015
  • Creativity is an ever-increasing research area related to fashion design, namely the documentation and dissemination of creative scholarship. The purpose of this project is to apply creative bridge or creative leap theory to the development of an existing designer's garment collection using the creative design process of an architect. A single case study design was used to investigate the phenomenon of design process creative leap using a direct observation. Results indicate the difficult challenge of producing new and individualized silhouettes for the marketability of clothing, it is apparent that new methods of fostering creativity in designers through non-traditional approaches would benefit the education of apparel designers. Through targeted design practice, educators and practitioners can apply the principles of scientific inquiry into design processes to solve a problem, address a challenge, or create based on personal inspirations.

공기다단 석탄버너에서 연소공기 유동조건에 따른 NOx 배출특성에 관한 연구 (A study on the NOx emission characteristics with combustion air flow conditions in air-staged coal burner)

  • 김혁제;송시홍;김상현;이익형
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2003년도 추계학술대회
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    • pp.379-384
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    • 2003
  • Coal-burning utilities are facing a major NOx control compliance challenge due to the heavy emission regulation. In response to this challenge, some applicative technologies to effectively reduce NOx are developed and applied in the pulverized coal power plants. One of these is low NOx burner(LNB) equipped with multi-staged air register. In this study, NOx emission rate and flame shapes are investigated with secondary and tertiary air flow conditions in air staged coal burner, and the optimal windows of flow conditions to minimize NOx emission rate are found out. The test conditions treated in this study are the flow rate, swirl direction and intensity and throat injection velocity of secondary and tertiary air.

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비비엔 웨스트우드(Vivienne Westwood)의 작품세계 연구 (A Study on Vivienne Westwood Design)

  • 방수란
    • 한국가정과학회지
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    • 제2권1호
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    • pp.129-141
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    • 1999
  • The purpose of this study is to investigate the effect of historical costume style and painting on Vivienne Westwood design. For this purpose, the costume style after 16C and the rococo painting of 18C are researched. And through Westwood's recent designs, the external form and internal symbol are compared. The results of this study were as follows : 1. From Renaissance, Rococo, Crinoline, Bustle, S style were showed on Westwood design. 2. In external method, historical costume styles were expressed by silhouette, detail, costume item, textile and various cuttings. 3. In the case of painting, it focused on Rococo painting of 18C. Costumes in painting were realized or painting itself were used for textile. 4. Most of her design was cut in the round rather than in the flat, bold cutting and slash were employed. 5. These works are symbolizing the harmony of tradition and future, at the same time through the transformation of orthodox style, containing ridicule to the authority and a challenge to society as well as sex. These results let us know that Westwood is versatile to transform the history and harmonize the tradition and 20C Fashion successfully. (Korean J Human Ecology 2(1):129∼141, 1999)

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