Mokpo National University Research Articles

The role of online written communication channels for reading-writing connection

This study developed an empirical model that could test reading-writing connection theory by examining the mediating role of online written communication channels. A set of hypotheses, drawn on a socio-cognitive theory of reading-writing connection, was developed to examine how reading-writing practices influenced literacy development through online written communication. Factor analysis was conducted to examine empirical relationships among the theoretical variables obtained from survey data. The results showed a significant role of online written communication in reinforcing the relationship between literacy practices and development. First, the individual and social practices of reading and writing had little impact on the development in both areas. Second, online written communication channels had a significant interaction effect on reading-writing practices both at the individual and social dimensions. Third, online written communication channels, such as SNS-based interaction using mobile devices, served as the mediating variable that empowered the relationship between reading-writing practices and development. The empirical results suggest that, to encourage L2 students toward a more integrative continuum of reading-writing practices, practitioners should incorporate online written communication channel into teaching practices. (Mokpo National University · Daegu University)

황산용액에서 양이온계 추출제 및 TBP와의 혼합추출제에 의한 지르코늄(IV)과 하프늄(IV)의 용매추출

Abstract Separation of Zr(IV) and Hf(IV) from sulfuric acid solutions was investigated by extraction with several acidic extractantssuch as Versatic acid, LIX 63, and Cyanex 301. From strong sulfuric acid solutions, the separation of Zr(IV) and Hf(IV) by Ver-satic acid and LIX 63 was not possible, while selective extraction of Hf(IV) over Zr(IV) was obtained with Cyanex 301. How-ever, the extraction percentage of the two metals was much lower compared to that by D2EHPA. Mixing of TBP with Cyanex301 and D2EHPA led to negative effect on the extraction and separation of the two metal ions. The difference in the extractionreaction and separation selectivity between HCl, HNO 3 and H 2 SO 4 media with each extractant was discussed.Key words : Zirconium, Hafnium, Separation, Sulfuric acid, Acidic extractants · Received : January 18, 2016 · Revised : February 2, 2016 · Accepted : February 15, 2016Corresponding Author : Man Seung Lee (E-mail : mslee@mokpo.ac.kr)Department of Advanced Materials Science & Engineering, Mokpo National University, 1666 Yeongsan-ro, Cheonggye-myeon,Muan-gun, Chonnam, 58554, KoreaⓒThe Korean Institute of Resources Recycling. All rights reserved. This is an open-access article distributed under the termsof the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/), which permitsunrestricted non-commercial use, distribution and reproduction in any medium, provided the original work is properly cited.

Properties of Antimicrobial Substances Produced by Bacillus amyloliquefaciens CJW15 and Bacillus amyloliquefaciens SSD8

Xiaoming Liu1, Jae Min Shim1, Zhuang Yao1, Jae Yong Lee2, Kang Wook Lee1, Hyun-Jin Kim1,2, Kyung-Sik Ham3, and Jeong Hwan Kim1,2* 1Division of Applied Life Science (BK21 Plus), Graduate School, 2Institute of Agriculture and Life Science, Gyeongsang National University, Jinju 52828, Republic of Korea 3Department of Food Engineering and Solar Salt Research Center, Mokpo National University, Muan 58554, Republic of Korea

Polymers from Biomass: Characterization, Modification, Degradation, and Applications

1DBT-IOC Centre for Advanced Bioenergy Research, Indian Oil R&D Center, Sector 13, Faridabad 121007, India 2Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Brisbane, QLD 4072, Australia 3Chemical Engineering Department, University of Louisiana at Lafayette, Lafayette, LA 70504, USA 4Department of Food Engineering, Mokpo National University, Jeonnam 534-729, Republic of Korea

DC 스퍼터법과 비대칭 바이폴라 펄스 DC 스퍼터법으로 증착된 NbN 코팅막의 물성 비교연구

Department of Advanced Materials Science and Engineering, Mokpo National University, Jeonnam, 534-729, Korea(Received August 1, 2014 ; revised August 20, 2014 ; accepted August 25, 2014)ABSTRACTThe paper presents the comparative results of TiAlN coatings deposited by DC and pulsed DC asymmetricbipolar magnetron sputtering systems. The results show that, with the decreasing duty cycle and increasingpulse frequency, the coating morphology changes from a columnar to a dense structure, with finer grains.Pulsed sputtered TiAlN coatings showed higher hardness, higher residual stress, and smaller grain sizes thandc prepared TiAlN coatings. Moreover residual stress of pulsed sputtered TiAlN coatings increased on increas-ing pulse frequency. Meanwhile, the surface roughness decreased continuously with increasing pulsed DCfrequency up to 50 kHz.

유리생산공정 폐주석산화물에서 건식제련에 의한 주석회수기술

Abstract Most of the domestic need for tin rely on imports. In this work, a pyrometallurgical process was investigated to recover puretin from the tin oxides in tin bath which results from the production of flat glass and LCD panel. From the results on the effectof reaction temperature, the highest recovery percentage of tin was obtained at 1350 o C. The recovery percentage of tin wasimproved to 88% by employing the first and second smelting step. Electrorefining of the crude tin thus obtained led to pure tinwith purity higher than 99.9%. Key words : Tin oxide, Pyrometallurgy, Tin, Electrorefining, Recovery percentage 1. 서 론 주석은 유리공업, 전기전자 및 철강 산업 등에서 사용되고 있는 전략적인 위치를 차지하는 금속으로 용도가 1)급격히 늘어나고 있다. 국내주석 수요는 전량 수입에 의존하고 있으며, 국내에서 주석함량이 50% 이상인 · Received : December 19, 2014 · Revised : January 9, 2015 · Accepted : January 20, 2015Corresponding Author : Man-Seung Lee (E-mail : mslee@mokpo.ac.kr)Department of Advanced Materials Science & Engineering, Mokpo National University, 61 Dorim-ri, Chungkye-myun, Muan-gun, Chonnam, 534-729, KoreaTel : +82-62-450-2492 / Fax : +82-62-450-2498ⓒThe Korean Institute of Resources Recycling. All rights reserved. This is an open-access article distributed under the termsof the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/), which permitsunrestricted non-commercial use, distribution and reproduction in any medium, provided the original work is properly cited.

해부학적 구조를 이용한 유전자 정보 통합 기법

Abstract Biologists are pursuing genetics related researches that can provide the core information to understand a certain cancer or inherent diseases. However, biological experimentations can produce different results by the difference of various elements or environments at the time of experimentation and/or difference of interpretations. Therefore, currently existing research results can possibly provide different information. These inconsistency can be found through integration of gene information. Biologists can save their time and efforts to find certain gene information if the gene information is integrated without inconsistency. An efficient gene integration and augmentation scheme of gene information generated through different researches is introduced in this paper. Key Words : Gene Information, Genetic Information Integration, Anatomical Ontology, Bioinformatics Received 15 November 2014, Revised 16 December 2014Accepted 20 February 2015Corresponding Author: Gi-Chul Yang (Mokpo National University) Email: gcyang-umkc@hanmail.netⒸ The Society of Digital Policy & Management. All rights reserved. This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0), which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is ISSN: 1738-1916 properly cited.

공조시스템 개선에 따른 하절기 선실 온열환경 평가 및 유류절감에 관한 연구 - 실습선 새누리호를 중심으로 -

In this study, Mokpo national maritime university Training ship Centralizes Air Conditioning System was upgraded by installing onboard an Air-cooled Air conditioner. This resulted in the improvement of the performance and operation. This study compared refrigeration performance to former equipment and improving one. And through the actual measurement study about the cabin thermal environment, it will be used as basic data for marine air conditioning design and plan in the future. At same climate condition, when the Centralized Air Conditioning System and an improved air conditioning system operated, cabin temperature was at , humidity was 55~75 % as comfortable condition, Generator load measurement showed a saving of 48KW in the average load and 8 % in the full load factor. This also resulted in a saving of daily fuel oil consumption(FOC) at around 222 [] average. On the other hand, one cadet cabin(Cadet No.21) indicated a higher temperature due to heat transmission of engine room. It found us not to consider installing additional diffuser to reduce the heat transmission.

개념그래프 도구의 기능 및 특성 조사

Abstract Intelligent systems are systems that mainly use knowledge rather than data or information. Therefore, knowledge representation is an important factor for intelligent system construction. Conceptual graph is a logical knowledge representation language which has graphical form and it can represent knowledge efficiently. It is, however, cumbersome to use conceptual graphs directly for programming. Various tools were developed to overcome this difficulties. In this paper, we survey on functions and characteristics of conceptual graph tools that can be utilized for constructing intelligent systems by using conceptual graphs. The result of this survey will be very helpful to use conceptual graphs for development of intelligent systems. Keywords : Conceptual Graph, Intelligent System, Knowledge Representation, Conceptual Graph Tool Received 12 September 2014, Revised 25 October 2014Accepted 20 December 2014Corresponding Author: Gi-Chul Yang(Mokpo National University) Email: gcyang@mokpo.ac.krⒸ The Society of Digital Policy & Management. All rights reserved. This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0), which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is ISSN: 1738-1916 properly cited.

해양 통신 네트워크에서 안정적 통신을 위한 HARQ-ARQ interaction 기법의 성능 평가

As the wireless communication technologies are being studied for application to marine communication networks in a fusion of marine industries and IT technology, this paper proposes a HARQ-ARQ interaction scheme for reliable communication between the smart ships. Moreover, this paper evaluates the performance of the HARQ-ARQ interaction schemes through the computer simulation. In the HARQ-ARQ interaction scheme for marine network systems, as a HARQ acknowledgement is implicitly utilized as an ARQ acknowledgement. Hence, the HARQ-ARQ interaction scheme can reduce the packet delay. However, the HARQ-ARQ interaction scheme has problems caused by the error of HARQ feedback messages. Hence, this paper considers the effect of error of HARQ feedback messages on the performance of the HARQ-ARQ interaction scheme, in marine network systems. The simulation results show that the HARQ-ARQ interaction scheme can improve the delay performance of the ships in the marine network systems. 논문 14-39C-11-25 The Journal of Korean Institute of Communications and Information Sciences '14-11 Vol.39C No.11 http://dx.doi.org/10.7840/kics.2014.39C.11.1201 1201 ※ 본 연구는 미래창조과학부 및 정보통신산업진흥원의 IT융합 고급인력과정 지원사업의 연구 결과로 수행되었음(NIPA-2014-H0401-1 4–1009). 그리고 2012년도 정부(미래창조과학부)의 재원으로 한국연구재단의 지원을 받아 수행된 연구임(No. 2012R1A2A2A01012 059). First Author:Department of Electronic Engineering, Sogang University, jkson@sogang.ac.kr, 학생회원 ° Corresponding Author:Department of Electronic Engineering, Sogang University, jwso@sogang.ac.kr, 종신회원 * Mokpo National University Department of Information & Electronics Engineering, srlee@mokpo.ac.kr, 정회원 논문번호:KICS2014-10-402, Received October 8, 2014; Revised November 17, 2014; Accepted November 17, 2014 The Journal of Korean Institute of Communications and Information Sciences '14-11 Vol.39C No.11

Conversion of Cellulose over Ni Loaded Mesoporous MSU-F Catalysts via Air Gasification

Graduate School of Energy and Environmental System Engineering, University of Seoul, Seoul 130-743, Korea *E-mail: catalica@uos.ac.kr Korea Institute of Energy Research, Daejeon 305-343, Korea Department of Environmental Engineering, Sunchon National University, Suncheon 540-950, Korea Department of Environmental Education, Mokpo National University, Muan 534-729, Korea Department of Chemical Engineering, Kongju National University, Cheonan 330-717, Korea Department of Environmental Engineering, Inha University, Incheon 402-751, Korea. *E-mail: kjjeon@inha.ac.kr Received May 6, 2014, Accepted July 4, 2014

시계열 분석 기반 신뢰구간 추정을 통한 효율적인 이상감지

In this paper, we suggest a method of realtime confidence interval estimation to detect abnormal states of sensor data. For realtime confidence interval estimation, the mean square errors of the exponential smoothing method and moving average method, two of the time series analysis method, where compared, and the moving average method with less errors was applied. When the sensor data passes the bounds of the confidence interval estimation, the administrator is notified through alarming. As the suggested method is for realtime anomaly detection in a ship, an Android terminal was adopted for better communication between the wireless sensor network and users. For safe navigation, an administrator can make decisions promptly and accurately upon emergency situation in a ship by referring to the anomaly detection information through realtime confidence interval estimation. ※ 본 연구는 2013년도 정부(교육부)의 재원으로 한국연구재단의 지원을 받아 수행된 기초연구사업(No. 2009-0093828)과 미래창조과학 부 및 정보통신산업진흥원의 IT융합 고급인력과정 지원사업(NIPA-2014-H0401-14-1009)및 2013 학년도 목포대학교 교내연구비 지 원의 연구결과로 수행되었음 First Author : Mokpo National University Dept. of Computer Engineering, xfile7@mokpo.ac.kr, 학생회원 ° Corresponding Author : Mokpo National University Dept. of Computer Engineering, majung@mokpo.ac.kr, 정회원 * Mokpo National University Department of Computer Engineering, hykelitelady@naver.com ** Mokpo National University Department of Computer Engineering, chrispj@mokpo.ac.kr, 학생회원 논문번호:KICS2014-05-178, Received May 8, 2014; Revised August 7, 2014; Accepted August 7, 2014 논문 / 시계열 분석 기반 신뢰구간 추정을 통한 효율적인 이상감지

Supramolecular Nano-aggregates Directed by Phenyl Derivatives of Rhizobial Exopolysaccharides

Department of Biological Science, Mokpo National University, Jeonnam 534-729, KoreaReceived April 14, 2014, Accepted May 27, 2014Key Words : Phenyl exopolysaccharides, Supramolecular aggregates, Electron microscopySupramolecular self-assembly is a spontaneous process inwhich a disordered system of pre-existing components formsan organized structure or pattern through local interactionsamong the components.

해상용 VHF 디지털통신 시스템의 성능평가 방안

IMO and IALA have undertaken projects that GMDSS Modernization and E-navigation, which refer to Future digital communications systems for a more efficient transmission of voice and data communications in the VHF maritime mobile service. ITU has also resolved in WRC-07 Resolution 357 to study the use of spectrum-efficient technologies in order to provide for the operation of ship and port security and maritime safety systems. IALA and ITU WP5B have coordinated for the technical developments and the spectrum issues. Recommendation ITU-R M.1842-1 has approved by WP5B meeting. This revision provides a wideband data service both 50kHz and 100kHz in the VHF maritime mobile service. This paper has studied E-navigation, its needs for data exchange that includes explanations of the current methods for transmitting data by VHF that based in land mobile radio service. A further technologies trend is estimated for Recommendation ITU-R M.1842-1, that is based on the land mobile radio standards with some tailored to fit the needs of the maritime mobile service. 논문 14-39C-07-10 The Journal of Korea Information and Communications Society '14-07 Vol.39C No.07 http://dx.doi.org/10.7840/kics.2014.39C.7.582 582 ※ 본 연구는 미래창조과학부 및 정보통신산업진흥원의 IT융합 고급인력과정 지원사업의 연구결과로 수행되었음(NIPA-2014-H0401-14 -1009), 또한, 이 논문은 2013년도 정부(교육부)의 재원으로 한국연구재단의 지원을 받아 수행된 기초연구사업임(NRF-2009-0093828). First Author:Mokpo Maritime University Dept. of Marine Electronic and Communication Enginnering, yr9367@hanmail.net, 정회원 ° Corresponding Author:Mokpo National University Dept. of Information & Electronics Engineering, srlee@mokpo.ac.kr, 정회원 * 목포해양대학교 해양정보통신공학과, microkim@mmu.ac.kr ** 목포해양대학교 해양컴퓨터공학과, choijo@mmu.ac.kr, 종신회원 논문번호:KICS2014-05-173, Receved May 8 2014; Revised June 12, 2014; Accepted June 12, 2014 논문 / 해상용 VHF 디지털통신 시스템의 성능평가 방안 583 그림 1. RR 부록 18의 VHF 주파수배치 Fig. 1. VHF frequency arrangement of RR Appendix 18 그림 2. 새로이 재배치된 RR 부록 18 Fig. 2. VHF band by new Appendix 18 I. 서 론 GMDSS는 1999년에 본격적으로 개발된 이후 해상 통신에 커다란 변화를 가져왔다. 그러나 조난경보의 실패율이 높고, 운용이 복잡하며, 위치추적 거리가 짧 은 단점 때문에 최근 들어 현대화의 필요성이 제기되 었다. 특히, 해상통신에서 직면하고 있는 문제는 주파 수자원의 부족과 점차 증가해가는 정보량을 전송해야 한다는 것이다. 그리고 급속도로 발전한 육상 무선통 신과 마찬가지로 해상통신 시스템도 아날로그에서 디 지털로 음성에서 데이터 통신으로 변화시키고자 하는 사용자들의 요구가 증가하고 있다. 이러한 문제점을 해결하고 전 세계적으로 호환 가 능한 해상 무선통신 프레임워크를 구축하기 위해 IMO는 2006년에 E-navigation 전략을 수립하였다. 이를 지원하기 위해 IALA는 해상무선통신 계획을 발표하고 E-navigation을 위한 초기 시스템 구조와 신 규기술 규정 및 표준을 검토하고 있고, ITU-R은 해상 통신 시스템의 기술적 특성에 관해 규정하고 있다. WRC-07, Resolution 357은 선박의 운용과 항만보 안, 해상안전시스템을 지원하는 스펙트럼 효율적 기술 에 대한 운용 연구로 ITU와 IMO 그리고 IALA에 의 하여 요청되었다 . 이 보고서를 초안으로 Report ITU-R M.2010-1과 Recommendation(이하 Rec.) ITU-R M.1842-1에 의한 향후 VHF 해상디지털 통신 시스템은 IMO와 IALA에 의하여 적절한 연구와 관 련 연락문서의 교환을 고려하며, 제안된 작업문서는 새로운 보고서 초안으로 IMO에서 E-Nav 위원회를 위하여 IALA에 연락사항으로 전달되었다 . E-navigation 이란 선박의 안전 및 보안과 해양환 경 보호와 관련된 서비스를 개선하기 위해 선상이나 육상에서 해상정보의 수집, 통합, 교환, 표현, 및 분석 을 전자적으로 융합하고 통일된 포맷으로 보여주는 자동화된 전자항법 체계이다

Advance in Safe and Useful Social Network Services with Context-Sensitive Data in Cyber-Physical System

1 Department of Computer Engineering, Mokpo National University, Muan, Jeonnam 534729, Republic of Korea 2Department of Informatics, J. E. Purkinje University, Ceske mladeze 8, 400 96 Usti nad Labem, Czech Republic 3 AGH University of Science and Technology, 30 Mickiewicza Avenue, 30-059 Krakow, Poland 4 Institute of Engineering-Polytechnic of Porto, 4200-072 Porto, Portugal 5 GECAD-Knowledge Engineering and Decision Support Group, 4200-072 Porto, Portugal

Meeting report: plant genetics and molecular biology

The Genetics Society of Korea (GSK) Mini Symposium III was held October 25 2013 at the Mokpo National University, Korea. The topic was Plant Genetics and Molecular Biology. There were two sessions, respectively chaired by Professor Je-Chang Woo (Mokpo National University, Korea), the former GSK president, and Professor ChoongMo Park (Seoul National University, Korea), who will be the next GSK president. In the first session, two speakers presented their findings. The first speaker, professor Sang-Gu Kim (professor emeritus, Seoul National University, Korea), was the founding member and a former president of the GSK and served as the editor-in-chief of the Korean Journal of Genetics (formerly the Genes & Genomics). In his talk, entitled ‘‘Structure–function studies of a plant tyrosyl-DNA phosphodiesterase provide novel insights into DNA repair mechanisms of Arabidopsis thaliana’’, professor Kim briefly introduced the role plant genetics has played in the development of the GSK, since the founding of the society and then discussed his previous research and findings. Tyrosyl-DNA phosphodiesterase 1 (TDP1) is a member of the phospholipase D superfamily. It catalyzes the hydrolysis of a phosphodiester bond between a tyrosine residue and the 30-phosphate of DNA. Professor Kim’s group isolated TDP1 from Arabidopsis thaliana (AtTDP), which is an ortholog of yeast and human TDP. AtTDP hydrolyzes the 30-phosphotyrosyl DNA substrate, which is related to repairing DNA damage induced by topoisomerase I in vivo. An analysis of the substrate-saturation kinetics of the full-length AtTDP versus those of a truncated AtTDP mutant lacking the N-terminal SMAD/forkhead-associated domain showed that the kinetic parameters of recombinant AtTDP protein and the AtTDP 1-122 (TDP domain) are equivalent to those of the full-length AtTDP. The loss-offunction AtTDP displayed developmental defects and a dwarf phenotype, which was caused by decreased cell numbers rather than changes in cell sizes. The mutant tdp plants exhibited hypersensitivity to camptothecin, a potent topoisomerase I inhibitor, and rigorous cell death in their cotyledons and rosette leaves, suggesting a failure of DNA damage repair. This was the first clear evidence in plants that AtTDP plays a role in DNA repair. The second speaker in the first session was professor Jeong-Il Kim (Chonnam National University, Korea). The title of professor Kim’s talk was ‘‘Development of hyperactive phytochromes from the structure–function study in plant light signaling’’. Phytochromes are photoreceptors that regulate various aspects of plant growth and development in response to red/far-red light signals from the environment. Red-light absorbing (Pr) phytochromes (kmax = 660 nm) are biosynthesized in the dark. Pr phytochromes can be phototransformed into biologically active, far-red light-absorbing (Pfr) phytochromes (kmax = 680 nm) upon exposure to red light. This photoactivation induces a highly regulated signaling network for photoresponses in plants, which may be one of most the important biochemical reactions on Earth, because we all depend on the light-harvesting machinery of plants. Seeking biotechnological applications for crop improvement, professor Kim’s group used Arabidopsis to generate hyperactive phytochrome mutants, including J.-K. Oh J.-C. Woo Department of Biology, Mokpo National University, Mokpo, Korea

모나자이트 샌드의 염산침출용액으로부터 용매추출에 의한 Nd와 Pr의 분리

Abstract Solvent extraction experiments have been performed to separate Nd and Pr from chloride leaching solution of monazite sandusing PC88A and D2EHPA. For this purpose, the effect of the saponification of PC88A and D2EHPA on the extraction and sep-aration of the two metals were studied by varying the pH of aqueous solution. In the experimental ranges conducted in this study,the distribution coefficients of Nd were higher than those of Pr and separation factor value increased with the increase of solutionpH. Saponification of PC88A enhanced the distribution coefficients of Nd and Pr as well as the separation factor. Saponificationof D2EHPA had some effect on the extraction of the two metals but little effect on the separation factor.Key words : Solvent extraction, PC88A, D2EHPA, Saponification, Separation *Received : August 19, 2013 · Revised : September 9, 2013 · Accepted : September 23, 2013Corresponding Author : Man-Seung Lee (E-mail : mslee@mokpo.ac.kr)Department of Advanced Materials Science & Engineering, Mokpo National University, 61 Dorim-ri, Chungkye-myun, Muan-gun,Chonnam, 534-729, KoreaTel : +82-62-450-2492 / Fax : +82-62-450-2498 ⓒThe Korean Institute of Resources Recycling. All rights reserved. This is an open-access article distributed under the termsof the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/), which permitsunrestricted non-commercial use, distribution and reproduction in any medium, provided the original work is properly cited.

Surface-modified solid lipid nanoparticles for oral delivery of docetaxel: enhanced intestinal absorption and lymphatic uptake

Docetaxel is a potent anticancer drug, but development of an oral formulation has been hindered mainly due to its poor oral bioavailability. In this study, solid lipid nanoparticles (SLNs) surface-modified by Tween 80 or D-alpha-tocopheryl poly(ethylene glycol 1000) succinate (TPGS 1000) were prepared and evaluated in terms of their feasibility as oral delivery systems for docetaxel. Tween 80-emulsified and TPGS 1000-emulsified tristearin-based lipidic nanoparticles were prepared by a solvent-diffusion method, and their particle size distribution, zeta potential, drug loading, and particle morphology were characterized. An in vitro release study showed a sustained-release profile of docetaxel from the SLNs compared with an intravenous docetaxel formulation (Taxotere®). Tween 80-emulsified SLNs showed enhanced intestinal absorption, lymphatic uptake, and relative oral bioavailability of docetaxel compared with Taxotere in rats. These results may be attributable to the absorption-enhancing effects of the tristearin nanoparticle. Moreover, compared with Tween 80-emulsified SLNs, the intestinal absorption and relative oral bioavailability of docetaxel in rats were further improved in TPGS 1000-emulsified SLNs, probably due to better inhibition of drug efflux by TPGS 1000, along with intestinal lymphatic uptake. Taken together, it is worth noting that these surface-modified SLNs may serve as efficient oral delivery systems for docetaxel.

폐촉매(廢觸媒) 염산침출액(鹽酸浸出液)에서 컬럼형 추출기(抽出器)에 의한 백금(白金) 회수(回收)

Abstract In order to recover Pt from the hydrochloric acid leaching solution of spent catalysts, bench scale Karr reciprocating columnwas employed. At an optimum flow rate and vibration frequency, iron and Pt was completely extracted by using TBP and Aliquat336. At the same vibration frequency, iron and Pt was completely stripped by HCl and HClO 4 after adjusting the flow rate. Inthe case of extraction of HCl from the raffinate with TEHA, it was difficult to maintain the stability of the column extractor.A comparison of the operation results between column extractor and mixer-settler is reported. Key words : Pt, Fe, HCl, Karr reciprocating column 1. Introduction Spent catalysts are valuable secondary resourcesfor the platinum group metals (PGMs). Much workhas been done on the recovery of PGMs from spentcatalysts by hydrometallurgical method. First, PGMsare dissolved by chloride based solution and thenare separated by employing solvent extraction or * Received : July 9, 2013·Revised : August 7, 2013·Accepted : August 21, 2013Corresponding Author : Man-Seung Lee (E-mail : mslee@mokpo.ac.kr)Department of Advanced Materials Science & Engineering, Mokpo National University, 61 Dorim-ri, Chungkye-myun, Muan-gun, Chonnam, 534-729, KoreaTel : +82-62-450-2492 / Fax : +82-62-450-2498ⓒThe Korean Institute of Resources Recycling. All rights reserved. This is an open-access article distributed under the termsof the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/), which permitsunrestricted non-commercial use, distribution and reproduction in any medium, provided the original work is properly cited.

Short and Efficient Synthesis of Licochalcone B and D Through Acid-Mediated Claisen-Schmidt Condensation

College of Pharmacy and Research Institute of Drug Development, Chonnam National University, Gwangju 500-757, Korea *E-mail: shcheon@jnu.ac.kr School of Pharmacy, Wenzhou Medical College, 1210 University Town, Wenzhou, Zhejiang 325035, China College of Pharmacy and Natural Medicine Research Institute, Mokpo National University, Jeonnam 534-729, Korea Received September 6, 2013, Accepted September 25, 2013