• Title/Summary/Keyword: specific charge

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Nano-sized Drug Carriers and Key Factors for Lymphatic Delivery

  • Choi, Ji-Hoon;Lee, Yong-Bok
    • Journal of Pharmaceutical Investigation
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    • v.40 no.spc
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    • pp.75-82
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    • 2010
  • Specific diseases like cancer and acquired immune deficiency syndrome (AIDS) occur at various organs including lymphatics and spread through lymphatic system. Thus, if therapeutic agents for such diseases are more distributed or targeted to lymphatic system, we can obtain several advantages like reduction of systemic side effect and increase of efficacy. For these reasons, much interest has been focused on the nature of lymphatics and a lot of studies for lymphatic delivery of drugs have been carried out. Because lymphatics consist of single layer endothelium and have high permeability compared with blood capillaries, especially, the studies using nano-sized carriers have been performed. Polymeric nano-particle, liposome, and lipid-based vehicle have been adopted for lymphatic delivery as carriers. According to the administration route and the kind of carrier, the extent of lymphatic delivery efficiency of nano-sized carriers has been changed and influenced by several factors such as size, charge, hydrophobicity and surface feature of carrier. In this review, we summarized the key factors which affect lymphatic uptake and the major features of carriers for achieving the lymphatic delivery. Lymphatic delivery of drug using nano-sized carriers has many fold improved ability of lymphatic delivery compared with that of conventional dosage forms, but it has not shown whole lymph selectivity yet. Even though nano-sized carriers still have the potential and worth to study as lymphatic drug delivery technology as before, full understanding of delivery mechanism and influencing factors, and setting of pharmacokinetic model are required for more ideal lymphatic delivery of drug.

International Trends and Policy Recommendations Related to Non-Indigenous Species (외래종관리에 관한 국제동향 및 정책방향)

  • Park, Yong-Ha
    • Journal of Environmental Policy
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    • v.1 no.1
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    • pp.25-45
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    • 2002
  • Opening of trade relationships through an increasing number of international free trade agreements and the now defunct General Agreement on Tariffs and Trade has resulted in an increase the number of the species being exchanged in the world. In the last 20 years, international environmental laws have multiplied and a number of treaties address harmful non-indigenous species (NIS) directly with specific provisions, while other treaties deal with related environmental issues and indirectly affect international regulation of NIS; however, such treaties are weak due to lack of enforceability. From the stand point of national law, many countries including the USA, Australia and New Zealand enforce national laws and regulations to protect biological resources. Typical strategies include : 1) strengthening quarantines to prevent unintentional and illegal introduction of harmful NIS, and 2) developing technologies for managing harmful NIS. However, the recent international trend for managing NIS has shifted. In 2002, the Bonn Guidelines on Access to Genetic Resources and Fair and Equitable Sharing of the Benefit Arising out of their Utilization was adopted at the 6th Conference of the Parties to the Convention on Biodiversity. One major issue highlighted in the document is that "there is no more free of charge to get a biological resource from other countries". The Bonn guidelines will affect international and national NIS regulatory systems because the NIS is a potentially disrupts ecosystems as well as native species. A number of impacts are expected including the revamping of national biodiversity policy regimes in many countries in the world. In particular, the ROK, which is not very biologically diverse, has to evolve national laws to protect valuable ecosystems from NIS. In the meanwhile, national rights of using beneficial indigenous and non-indigenous species as biological resources should be considered through the investigation and national registration of NIS around the world for the promotion of the biotech industry.

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The Development of Standard and Disposition for Effective Job Performance of School Food Service Dietician (학교급식 전담직원의 표준 직무모델 개발에 관한 연구)

  • 이영은;양일선;차진아;유태용
    • Journal of Nutrition and Health
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    • v.35 no.7
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    • pp.800-817
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    • 2002
  • It is not stipulated concretely in the Food Sanitation Act what the standardized school food service dieticians indices and the dietician's duties and task elements should be. Therefore, this study was required. The specific purposes of this study were : a) to define the school food service dietician's duties and task elements, b) to estimate the performance frequency and work hours of the dietician's duties and task elements c) to investigate the job specification of the dietician over school food services, d) to develop the standardized indices of the dietician needed in school food service operation. For this study, school food service dietician's work functions were defined in 10 duties and 60 task elements based on the studies precedented and literature review and pilot test process. This study was conducted in school food service systems nationwide using written questionnaire and interview with the official in charge and delphi technique. The questionnaires were mailed to the dieticians of three types of school food service systems. Of the 660 schools that participated in this study, the 624 responses were selected for analysis. Statistical analyses were performed with SAS/Win 6.12 program so as to provide a descriptive statistics, T-test, ANOVA. The main results of this study could be summarized as follows: A characteristic common to all the school food service systems was that 'cooking and distribution management' took the longest hours of work, while 'nutrition education' took the shortest hours of work. The standardized index of dietician over school food service was one person in conventional system independently of the number of meals per day. In the commissary system, according to the numbers of meals served per day, it was 0.95-1.38 persons and 1.27-1.55 persons and 1.40-1.91 persons. In joint management system, the standardized index was 1.03-1.42 persons in case of serving less than 700 meals per day.

The Study on Symbolism of Color on Movie Clothing (영화 의상에 표현된 색의 상징성에 관한 연구)

  • 김희정
    • Journal of the Korean Society of Costume
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    • v.35
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    • pp.195-210
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    • 1997
  • Movie clothing is what is recreated as a character in work after being worn for actors (or actresses). And it is not added for heightening only fantasy but it acts for heightening only fantasy but it acts for reinforcing the side of character or subject. Especially the clothing in color movie gets to have very psychological effect. Thus Accord-ing to the clothing the effect of the represen-tation style may become large and small. So as to make the gesture or attitude of each character valuable in accordance with the ac-tion and expression of the figure clothing is different from other device essentially One may attain various goals through the color of movie clothing, First movie clothing may show the vogue color of the time and the representative time color, Second the color of movie clothing helps one to able to recognize the socio-econmic position of character easily as the color to symbolize the specific jobs such as nurse soldier and doctor etc. Third the color of movie clothing may show the charcter temperament as to whether one is young or old and whether one has pessi-mistic temperament or one is extrovert or introversive etc. easily. Fourth setting the clothing color of hero as the color to set off helps it easy to distinguish from representation staffs. Fifty the whole color establishment of movie clothing gives help to expressing the at-mosphere of movie. Color is one of the most powerful means that the person in charge of clothing may express the character of movie. He should ex-press the feature of a wearer with the colors of each clothing through showing the lack of taste of characters or hinting the resistant character with the clothing color which is not suitable for situation or the conservative character with suppressed color etc. Thus he (or she) should express the clothing color which is suitable for being able to express each character by analyzing the work whole through script and grasping the character of each character so as to establish the clothing which is suitable for individual character.

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Electrical Properties of Supercapacitor Based on Dispersion Controlled Graphene Oxide According to the Change of Solution State by Washing Process (Washing을 통한 상분리 변화에 따른 그래핀 산화물의 분산도 조절 및 슈퍼커패시터의 특성에 관한 연구)

  • Sul, Ji-Hwan;You, In-kyu;Kang, Seok Hun;Kim, Bit-Na;Kim, In Gyoo
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.31 no.2
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    • pp.102-106
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    • 2018
  • Recently, there has been an increasing interest in the use of graphene as electrode materials for supercapacitors. In this regard, graphene oxide (GO) films were prepared using GO slurry obtained by dispersing GO powder in deionized (DI) water. The degree of dispersion of GO powder in DI water depends on the concentration of GO slurry, pH, impurity content, GO particle size, types of functional groups contained in GO, and manufacturing method of GO powder. In this study, the dispersivity of the GO powder was improved by adjusting the pH using only DI water (without additives), and a uniform GO film was obtained. The GO film was reduced by exposure to xenon intense pulsed light for a few milliseconds, and the reduced GO film was used as electrodes of a supercapacitor. The supercapacitor was characterized using cyclic voltammetry (CV), charge-discharge cycle, and electrochemical impedance spectroscopy measurements, and the specific capacitance of the supercapacitor was found to be ~140 F/g from the CV data.

A Study on the Exclusion of the Seller's Liability for Defects in Title (국제물품매매계약에서 매도인의 권리적합의무 면제에 관한 연구)

  • MIN, Joo-Hee
    • THE INTERNATIONAL COMMERCE & LAW REVIEW
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    • v.69
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    • pp.23-43
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    • 2016
  • This study describes the exclusion of the seller's liability for defects in title under CISG and UCC. Through comparing two provisions, this article provides contracting parties with guidance regarding choosing governing laws and practical advice. CISG and UCC states not only the seller's liability for defects in title but also the exclusion respectively. Under two provisions, contracting parties who wish to avoid this liability may agree that the liability will not apply. Under UCC ${\S}$2-213(2), the seller's warranty can be disclaimed by specific language in the contract or by the circumstances surrounding the transaction. Although there is no express exclusion provision under CISG Article 41 and 42, Article 6 allows contracting parties to agree that they may exclude the application of the seller's liability. Both Article 42 under CISG and ${\S}$2-213(3) under UCC provide where the buyer furnishes specification to the seller. Under UCC ${\S}$2-213(3), it is the buyer's warranty to hold the seller harmless from any claims which arise from the seller complying with specification furnished by the buyer. But, under CISG Article 42, the seller's duty is excluded if the third party right or claim result from the fact that the seller has complied with specifications provided by the buyer. Therefore Article 42 does not charge the buyer with the duty, but rather limits the circumstances under which he could cause claims under Article 42. Interestingly, CISG has provisions which are absent from UCC. First, under Article 41, the seller escapes the liability if the buyer agree to take the goods subject to the third party right or claim. Second, under Article 42(2)(a), the seller is not liable if the buyer knew or could not have been unaware of the third party right or claim at the time of the conclusion of the contract.

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Case Study on Job Flow Improvement of Foodservice at a University Hospital (대학병원 급식업무 개선 사례 연구)

  • Kim, Hyung Mi;Yang, Il Sun;Park, Eun Cheol;Lim, Hyun Sook
    • Quality Improvement in Health Care
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    • v.7 no.2
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    • pp.244-261
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    • 2000
  • Background : In order to cope with changes in the management environment at hospitals, increased interests are drawn in patient foodservice system on Continuous Quality Improvement Activity as the method of approaching a quality food service and effective management. Thus, as a part of this activity, this study was conducted to evaluate job flow improvement that was already performed and the results of that process at the dietetic department of a university hospital, focusing on improving management. Method : On February 15 of 1998. the dietetic department formed a job flow-improvement to decide on the priority of job flow improvement, and prepared specific action strategies and schedule of the priority: after a 5 month process period, job improvement achieved on June 15. 1998. Also, economic achievement of the task was evaluated through labor productivity analysis and cost-benefit analysis. Results : The patient food service system which was managed decentralized at the present hospital was centralized, some steps of the food service process were integrated, and quality of patient food was improved. Also, as a solution of the problems expected when conducting job flow improvement was made on food service equipments and utensils. The result of evaluating the job flow improvement that labor productivity improved by 18.2% compared to before the improvement and the result of the analysis of cost-benefit showed that Benefit-Cost (B/C) ratio was 2.22. showing financial merit on the investment. Conclusions : Continuous Quality Improvement Activity needs to be initiated and conducted in the future in various areas of hospital foodservice system in order to actively adopt to ever changing hospital management environment. In order to achieve this goal, many researches and more efforts need to be put in by people in charge of hospital food service management, and interests and support are needed from hospital policy makers.

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Chromatographic Fractionation of Protease Inhibitors from Fish Eggs (어류 알로부터 Protease Inhibitors의 크로마토그래피법에 의한 분획)

  • Kim, Jin-Soo;Kim, Ki Hyun;Kim, Hyeon Jeong;Kim, Min Ji;Park, Sung Hwan;Lee, Hyun Ji;Heu, Min Soo
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.46 no.4
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    • pp.351-358
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    • 2013
  • A protease inhibitor from fish eggs was fractionated using chromatographic methods. The fractionation efficiency was evaluated in terms of specific inhibitory activity (SIA, U/mg), purity (fold), total inhibitory activity (TIA, U), and recovery (%). The protease inhibitor (PI) from egg extracts of skipjack tuna (ST Katsuwonus pelamis), yellowfin tuna (YT Thunnus albacares) and Alaska pollock (AP Theragra chalcogramma) was fractionated using Sephadex G-50 gel filtration and DEAE-Sepharose CL-6B anion exchange chromatography based on protein size exclusion and net charge, respectively. Fractions exhibiting strong inhibitory activity were contained in the 30-50 kDa fraction on gel filtration and in the range of 0.4-0.7 M NaCl gradient fraction on anion exchange chromatography. The respective TIA and percent recovery of the fraction obtained with gel filtration toward trypsin and $N{\alpha}$-benzoyl-L-arginine-p-nitroanilide (BAPNA) were 2,758.7 U and 29.6% for ST, 1,005.5 U and 25.6% for YT, and 1,267.5 U and 26.0% for AP. Gel filtration chromatography was more effective at fractionating PI than using ion exchange chromatography. These results suggest that fish eggs act as serine protease inhibitors and might be useful for protease inhibition in foodstuffs.

Design and Implementation of an Interface Module for the ETC System using Mobile Phone (휴대폰 기반 ETC시스템을 위한 인터페이스 모듈 설계 및 구현)

  • Shin Song-Ah;Yim Joe-Hong
    • Journal of Navigation and Port Research
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    • v.28 no.10 s.96
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    • pp.881-889
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    • 2004
  • Using the ETC Service, it is now possible to charge a vehicle for driving pass a specific toll booth electronically, without the vehicle even having to slow down. The smart card and card reader used to collect tolls electronically have a serious problem which it dose not have a standard for the ETC system. In this paper, we suggest the ETC system using mobile phone to collect tolls efficiently instead of existing system which is consist of a Interface Module to connect between a mobile phone and OEE, a mobile phone to send the information of tollgate fees and OEE to communication with RSE of roadway in the vehicle. This primary focus of this system is the IM functions and protocol to assist of the existing mobile phone and OBE.

Genetic regulation for the biosynthesis of glutamate family in Corynebacterium glutamicum (Corynebacterium glutamicum에서의 glutamate계 아미노산 생합성의 유전적 조절)

  • Kim In-Ju;Kyung Hee Min;Sae Bae Lee
    • Microbiology and Biotechnology Letters
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    • v.14 no.5
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    • pp.427-432
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    • 1986
  • The regulation of three ammonia assimilatory enzymes, GDH (glutamate dehydrogenase), GS (glutamine synthetase) and GOGAT (glutamate synthase), has been examined in C. glutamicum. Three kinds of arginine auxotrophs blocked in each step of arginine biosynthetic pathway from glutamate were selected as arg 5, arg 6, arg 8. Histidine and tryptophan auxotrophs were also selected because histidine and tryptophan repressed GS biosynthesis in E. coli. These strains were cultured on the media containing nitrogen-excess and limited conditions, to compare the specific activities of ${\alpha}$-ketoglutarate dehydrogenase(${\alpha}-KGDH$), GDH, GS, GOGAT from the cell-free extracts. These results showed that enzyme levels of ${\alpha}-KGDH$ and GDH from 3 kinds of arginine auxotrophs, histidine and tryptophan auxotrophs in nitrogen-excess condition and those of GS and GOGAT in nitrogen limited condition were increased compared with opposite condition. The tryptophan and histidine auxotrophs showed higher level of glutamate and glutamine than parental strains and other mutants. it is assumed that the higher levels of ${\alpha-KGDH}$ and GDH from mutants in nitrogen-excess condition promoted the accumulation of glutamate and glutamine in fermentation broth. The inhibition of GS activities by ADP suggested that GS is regulated by energy charge in C. glutamicum. The results with histidine, tryptophan, glycine, alanine, serine and GMP implied that a system of feedback inhibition were effective. The GDH, GS and GOGAT biosynthesis in culture broth was markedly repressed by the nature and kinds of available nitrogen sources such as tryptophan, proline, glycine, alanine, serine and tyrosine.

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