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        • Consideration Related to the Aharonov-Bohm Effect

          Khang,Jeong-woo,Khang,Dong-shik 제주대학교 1987 논문집 Vol.24 No.-

          Aharonov-Bohm 효과를 WKB방법을 사용해서 설명하고, 국소장 이론으로 자연을 서술하는 방법의 타당성에 대해 고찰하였다.

        • KCI등재

          쯔놈과 놈 문학-중대 베트남 문화의 찬란한 성과

          Dinh Thi Khang 조선대학교 국제문화연구원 2009 국제문화연구 Vol.2 No.1

          '스콜라' 이용 시 소속기관이 구독 중이 아닌 경우, 오후 4시부터 익일 오전 7시까지 원문보기가 가능합니다.

          After obtaining the nation’s independence, Vietnam feudal dynasties continued to use Han as the official script. However, to satisfy people’s daily need, Nom was created and became an outstanding accomplishment in Vietnamese literature, which expressed the national esteem, power as well as position of Vietnamese language. Nom script was steadily improved, and Vietnamese people started to use Nom in literature work from XIII century. This was a significant improvement in national esteem and as well as a remarkable development in literature. History of Nom literature spread in seven centuries and was divided into four periods: Period 1 (the X century - the XIV century): Come along with Han, Nom script started to appear in literature since Tran’s dynasties. This is the vital achievement in the period which set up the basis for the development of composing in national language in the following centuries. Period 2 (the XV century -the XVII century): Besides accomplishments in Han compositions, Nom literature with diverse styles was well developed and attained worthy achievements, which set a firm fundamental for the development later on. The success of Tho Nom Duong luat was marked with the existence of massive collections (including hundreds of poems). This time was the outstanding period in the literature history. Period 3 (the XVIII century - the beginning of XIX century): This time was considered as the golden age in the history with a notable development in Nom literature. With traditional literary styles, compositions written in Nom created masterpieces in literary heritages. Period 4 (from the late XIX century): In transformation process of national literature from medieval to modern, Nom compositions continuously played an importance role in create the unique features in this stage. The appearance and development of Nom literature is a must in the Vietnamese literature history in the process of building up our literature, In this process, the compositions written by several famous authors, for example Nguyen Trai, Nguyen Binh Khiem, Doan Thi Diem, Nguyen Gia Thieu, Ho Xuan Huong, Nguyen Du, Nguyen Dinh Chieu, Nguyen Khuyen, Tu Xuong, and etc., have created a series of valued masterpiece; among those, ‘Doan truong tan thanh’ (Truyen Kieu) written by Nguyen Du is consider the number one masterpiece. Hence, Nom literature achievement has claimed an important role of Vietnamese language in literature compositions. The appearance of Nom script and Nom literature are astounding successes of Vietnamese literature in medieval period. With Nom written language, so many traditional literary styles were created and added worthy values into Vietnamese literature. The first achievement was to vietnamize Duong luat style to make up Tho Nom Duong luat - a style of poetry of which all the features of Vietnamese poetry were taken into account. The second success was creating two kinds of whtten compositions named Truyen Nom and Khuc ngam song that luc bat on the basis of folk poetry (six-eight meter and double seven six-eight meter style) In Nom compositions, public language used to be considered informal speech was brought into written work. The process of setting up Nom literature was the development of language selection and usage as well as the improvement in expression abilities and art level of national language. Nom compositions insisted the values, fates, right of existence and aspirations of human, especially those of women. Those were the general topics in our literature which followed humanism. As a result, democracy in content which required nationalized manners of expression in terms of written language, style of poetry and speech became the norm in Vietnamese literature. Vietnam has officially been a member of IRG since 2000. Written Nom has been encoded to add into international symbol system with similar script in the area. As a result, Nom written language created by Vietnamese people has been internationally recognized as a unique contribution to the cultural treasure of humanity.

        • Truyện nôm – hiện tượng văn hoá và Thể loại văn học đặc biệt của thời trung đại ở Việt Nam

          Đinh Thị Khang 조선대학교 국제문화연구원 2010 국제문화연구 Vol.3 No.1

          The unique genre, Nom Literature and its cultural phenomenon during the medieval period in Vietnam. Dinh Thi Khang Truyen Nom was sin-eight metre written in Nom. The existence and value of Truyen Nom is a unique culture phenomenon in the history of Vietnamese culture. During the medieval period (10th–19th C) in Vietnam, the less popularity of Han prose poem led to a decline in the number of Nom prose composed. Truyen Nom was created based on the need for social and cultural reflection and lasted for four centuries. During four century history, Truyen Nom reached its peak in the 18C until the first half of 19C. With a wide dissemination and strong influence, Truyen Nom became the most prominent compositional style and played the important role in the society in terms of spiritual, cultural and civil reflection. Besides written work, Truyen Nom also existed in spoken compositions about daily life which were popularized in public through folk song, lullaby, tales and folk quizzes. The collection of Truyen Nom now includes about 100 pieces of work and processes a number of great compositions such as Hoa Tien, Phan Tran, Quan Am Thi Kinh, Hoang Truu, Pham Tai Ngoc Hoa and Doan Truong Tan Thanh(also known as Truyen Kieu). Truyen Nom was actually divided into two main different types: academic compositions and conventional work. The diversity of Truyen Nom in terms of contents, characters and literary speech made up great literacy and cultural values. The main content of Truyen Nom related to human values and destiny; some were about the aspiration for the freedom of love beyond feudal morality. Others were written about people’s life and personality who fought against oppressive influence to save the family’s happiness and to maintain social justice. The traditional medieval attitude of art brought into Truyen Nom a range of Orientation’s theoretical value in character creation and problem resolution.

        • Microwave Power Transfer With Optimal Number of Rectenna Arrays for Midrange Applications

          Khang, Seung-Tae,Lee, Dong-Jin,Hwang, In-Jun,Yeo, Tae-Dong,Yu, Jong-Won IEEE 2018 IEEE antennas and wireless propagation letters Vol.17 No.-

          <P>In this letter, the microwave power transfer (MPT) system with the optimal number of rectenna arrays for midrange applications is proposed, theoretically analyzed, and verified. A retrodirective power transmitter is designed to overcome the degradation by the near-field effect and enhance the power transfer efficiency. The implemented transmitter is composed of 16 <TEX>$\times$</TEX> 1 patch antennas with a <TEX>$\lambda /2$</TEX> spacing, and each of the antennas has a circuit for simultaneously detecting and shifting the phase, and operates at a frequency of 2.45 GHz. To further improve the power transfer efficiency, the parallel dc combining rectenna array is designed since the conventional RF combining rectenna has several problems in the case of midrange. The fabricated rectenna array consists of 8 <TEX>$\times$</TEX> 1 rectennas with a <TEX>$\lambda /2$</TEX> spacing and a dc power management circuit. In addition, the optimal number of rectenna arrays is proposed, considering the size of the receiver. In the experiments, the optimal number of rectennas is 3 when the transfer distance is 1 m. The achieved power transfer efficiency from three-arrayed rectennas is 4.47%, while the efficiency of 5.01% is achieved from eight-arrayed rectennas. Experimental results from the implemented MPT system show good agreement with the proposed theory.</P>

        • Expression of epithin in mouse preimplantation development: Its functional role in compaction

          Khang, Inkoo,Sonn, Seongkeun,Park, June-Hee,Rhee, Kunsoo,Park, Dongeun,Kim, Kyungjin Elsevier 2005 Developmental biology Vol.281 No.1

          <P><B>Abstract</B></P><P>The preimplantation development of mammalian embryo after fertilization encompasses a series of events including cleavage, compaction, and differentiation into blastocyst. These events are likely to be associated with substantial changes in embryonic gene expression. In the present study, we explored the expression patterns and function of epithin, a mouse type II transmembrane serine protease, during preimplantation embryo development. RT-PCR analysis showed that epithin mRNAs were detectable during the cleavage stages from a 1-cell zygote to the blastocyst. Immunocytochemical studies revealed that epithin protein was expressed at blastomere contacts of the compacted 8-cell and later embryonic stages. Epithin colocalized with E-cadherin at the membrane contacts of the compacted morula-stage embryo as revealed by double-staining immunocytochemistry and confocal microscopy, respectively. Post-transcriptional epithin gene silencing by RNA interference (RNAi) resulted in the blockade of 8-cell in vitro-stage embryo compaction and subsequent embryonic deaths after several rounds of cell division. These results strongly suggest that epithin plays an important role in the compaction processes that elicit the signal for the differentiation into trophectoderm and inner cell mass.</P>

        • KCI등재

          The effect of fixation plate use on bone healing during the reconstruction of mandibular defects

          Khang Do Gia Hong,Seong-Gon Kim,Young-Wook Park 대한구강악안면외과학회 2019 대한구강악안면외과학회지 Vol.45 No.5

          Objectives: This study sought to compare efficiency results between the use of a customized implant (CI) and a reconstruction plate (RP) in mandibular defect reconstruction in an animal model. Materials and Methods: Fifteen rabbits underwent surgery to create a defect in the right side of the mandible and were randomly divided into two groups. For reconstruction of the mandibular defect, the RP group (n=5) received five-hole mini-plates without bone grafting and the CI group (n=10) received fabricated CIs based on the cone-beam computed tomography (CBCT) data taken preoperatively. The CI group was further divided into two subgroups depending on the time of CBCT performance preoperatively, as follows: a six-week CI (6WCI) group (n=5) and a one-week CI (1WCI) group (n=5). Daily food intake amount (DFIA) was measured to assess the recovery rate. Radiographic images were acquired to evaluate screw quantity. CBCT and histological examination were performed in the CI subgroup after sacrifice. Results: The 1WCI group showed the highest value in peak average recovery rate and the fastest average recovery rate. In terms of reaching a 50% recovery rate, the 1WCI group required the least number of days as compared with the other groups (2.6±1.3 days), while the RP group required the least number of days to reach an 80% recovery rate (7.8±2.2 days). The 1WCI group showed the highest percentage of intact screws (94.3%). New bone formation was observed in the CI group during histological examination. Conclusion: Rabbits with mandibular defects treated with CI showed higher and faster recovery rates and more favorable screw status as compared with those treated with a five-hole mini-plate without bone graft.

        • KCI등재
        • SCIESCOPUSKCI등재

          Yield and Chemical Composition of Cassava Foliage and Tuber Yield as Influenced by Harvesting Height and Cutting Interval

          Khang, Duong Nguyen,Wiktorsson, Hans,Preston, Thomas R. Asian Australasian Association of Animal Productio 2005 Animal Bioscience Vol.18 No.7

          A 3${\times}$4 factorial field experiment with a complete randomised split-plot design with four replicates was conducted from June 2002 to March 2003 at the experimental farm of the Nong Lam University, Ho Chi Minh City, Vietnam, to determine effects of different harvesting heights (10, 30 and 50 cm above the ground) and cutting intervals (45, 60, 90 and 285 days) on yield of foliage and tubers, and chemical composition of the foliage. Cassava of the variety KM 94 grown in plots of 5 m${\times}$10 m at a planting distance of 30 cm${\times}$50 cm was hand-harvested according to respective treatments, starting 105 days after planting. Foliage from the control treatment (285 days) and all tubers were only harvested at the final harvest 285 days after planting. Dry matter and crude protein foliage yields increased in all treatments compared to the control. Mean foliage dry matter (DM) and crude protein (CP) yields were 4.57, 3.53, 2.49, and 0.64 tonnes DM $ha^{-1}$ and 939, 684, 495 and 123 kg CP $ha^{-1}$ with 45, 60, 90 and 285 day cutting intervals, respectively. At harvesting heights of 10, 30 and 50 cm the DM yields were 4.27, 3.67 and 2.65 tonnes $ha^{-1}$ and the CP yields were 810, 745 and 564 kg $ha^{-1}$, respectively. The leaf DM proportion was high, ranging from 47 to 65%. The proportion of leaf and petiole increased and the stem decreased with increasing harvesting heights and decreasing cutting intervals. Crude protein content in cassava foliage ranged from 17.7 to 22.6% and was affected by harvesting height and cutting interval. The ADF and NDF contents of foliage varied between 22.6 and 30.2%, and 34.2 and 41.2% of DM, respectively. The fresh tuber yield in the control treatment was 34.5 tonnes $ha^{-1}$. Cutting interval and harvesting height had significant negative effects on tuber yield. The most extreme effect was for the frequent foliage harvesting at 10 cm harvesting height, which reduced the tuber yield by 72%, while the 90 day cutting intervals and 50 cm harvesting height only reduced the yield by 7%. The mean fresh tuber yield decreased by 56, 45 and 27% in total when the foliage was harvested at 45, 60 and 90 day cutting intervals, respectively. It is concluded that the clear effects on quantity and quality of foliage and the effect on tuber yield allow alternative foliage harvesting principles depending on the need of fodder for animals, value of tubers and harvesting cost. An initial foliage harvest 105 days after planting and later harvests with 90 days intervals at 50 cm harvesting height increased the foliage DM and CP yield threefold, but showed only marginal negative effect on tuber yield.

        • SCISCIESCOPUS

          Neurogenesis of bone marrow-derived mesenchymal stem cells onto β-mercaptoethanol-loaded PLGA film.

          Khang, Gilson,Kim, Hye Lin,Hong, Minsung,Lee, Dongwon Springer 2012 Cell and tissue research Vol.347 No.3

          <P>Bone marrow-derived mesenchymal stem cells (BMSCs) are of particular interest in the field of tissue engineering because of their potential to differentiate into osteoblasts, chondrocytes, and neuronal cells. In order to promote the differentiation of BMSCs into specific cell types, appropriate scaffold biomaterials and bioactive molecules that can support the differentiation of BMSCs into specific cell types are needed. We hypothesized that β-mercaptoethanol (BME), which has been reported to induce the differentiation of BMSCs into neural-like cells, promotes BMSCs to differentiate into neural-like cells when BME is added to polymeric scaffolds containing the BMSCs. We fabricated biocompatible film shaped scaffolds composed of poly(lacti-co-glycolic) acid (PLGA) and various concentrations of BME to confirm that BME-promoted differentiation of BMSCs is concentration-dependent. Cell proliferation increased as the BME concentration in the films increased at the early stage, and the proliferation rate remained similar on the PLGA films for 3?weeks following the BMSC seeding. The expression of neuronal markers in differentiated BMSCs was assessed by RT-PCR. At 2- and 3-week time-points, mRNA expression of neurofilament and neuron specific enolase was significantly increased in PLGA/BME films containing 400?μM BME compared to PLGA films. Thus, we have identified BMSC-seeded PLGA/BME films with 200?μM and 400?μM BME as potentially useful candidates for neural tissue engineering applications by promoting BMSC proliferation and differentiation towards neural-like cells.</P>

        • SCIESCOPUSKCI등재

          Recombinant S-Layer Proteins of Lactobacillus brevis Mediating Antibody Adhesion to Calf Intestine Alleviated Neonatal Diarrhea Syndrome

          Khang, Yong-Ho,Park, Hee-Young,Jeong, Yoo-Seok,Kim, Jung-Ae,Kim, Young-Hwan The Korean Society for Microbiology and Biotechnol 2009 Journal of microbiology and biotechnology Vol.19 No.5

          A chimeric gene encoding enhanced green fluorescent protein (EGFP) and a S-layer protein from Lactobacillus brevis KCTC3102, and/or two copies of the Fe-binding Z-domain, a synthetic analog of the B-domain of protein A, was constructed and expressed in Escherichia coli BL21(DE3). The S-layer fusion proteins produced in a 500-1 fermentor were likely to be stable in the range of pH 5 to 8 and $0^{\circ}C$ to $40^{\circ}C$. Their adhesive property enabled an easy and rapid immobilization of enzymes or antibodies on solid materials such as plastics, glass, sol-gel films, and intestinal epithelial cells. Owing to their affinity towards intestinal cells and immunoglobulin G, the S-layer fusion proteins enabled the adhesion of antibodies to human epithelial cells. In addition, feeding a mixture of the S-layer fusion proteins and antibodies against neonatal calf diarrhea (coronavirus, rotavirus, Escherichia coli, and Salmonella typhimurium) to Hanwoo calves resulted in 100% prevention of neonatal calf diarrhea syndrome (p<0.01), whereas feeding antibodies only resulted in 56% prevention.

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