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다중 안테나 환경을 고려한 MC-CDMA 시스템에서의 효율적인 전송 용량 증대와 간섭 완화 기법에 관한 연구
차동호,이규진,황선하,이계산 통신위성ㆍ우주산업연구회 2011 한국위성정보통신학회논문지 Vol.6 No.2
본 논문은 다중 안테나 시스템 환경에서 전송 용량을 보장하면서 통신 성능 신뢰성을 확보할 수 있는 효율적인 Throughput 향상기법에 관한 연구를 진행하였다. 기존 공간 다이버시티 기법은 각 안테나 채널들로부터 발생하는 간섭과 주파수 선택적 채널의 영향으로 코드 간 직교성의 훼손, 부반송파 직교성의 훼손이 발생하여 성능 향상이 제한적이다. 주파수 선택적 다중 안테나 채널 환경에 따라서 발생하는 안테나 간의 간섭을 SVD 채널 병렬화를 통하여 효과적으로 줄이고, 낮은 복잡도를 가지는 부반송파 결합기법을 통하여 제안시스템의 전송용량과 성능을 향상시키는 전송 시스템을 제안하였으며, 모의실험을 통하여 성능 향상을 확인하였다.
李敦求,車東鎬 서울大學校 農業生命科學大學 附屬樹木園 1992 서울大學校 樹木園 硏究報告 Vol.- No.12
This study was conducted in the Chusan Area of Seoul National University Researh Forests at Kwangyang, Korea. The objectives were to compare tree growth, soil nutrient distribution and soil profiles at Pinus rigida, Pinus rigida x P. taeda, Pinus taeda and Abies firma stands. Soils were collected from each layer. The amounts of total nitrogen, available phosphorous and potassium, and soil conductivity and pH were measured. The results obtained from this study were as follows: 1. The amount of total nitrogen, available phosphorous and potassium decreased from A to B layer. 2. All soils are acidic, and soil pH increased from A to B layer. 3. The annual diameter growth rate of Pinus taeda was higher than those of other species. 4. The annual volume growth rate of Pinus rigida x P. taeda stand was higher than those of other species.
분광광도법을 이용한 간단한 in Chemico 피부감작성 시험법의 개발
차동호 ( Dong-ho Cha ),네팔마헤시 ( Mahesh Raj Nepal ),김건호 ( Geon-ho Kim ),강미정 ( Mi-jeong Kang ),정태천 ( Tae-cheon Jeong ) 한국동물실험대체법학회 2019 동물실험대체법학회지 Vol.13 No.1
For the key event No. 1 in skin sensitization, a hapten should react with endogenous proteins for the initiation of immune reaction. Although Direct Peptide Reactivity Assay (DPRA) has been developed as an alternative method for key event 1, artificially synthesized peptides and HPLC should be employed in performance, which are somewhat inconvenient. In the present study, a simple spectrophotometrical method to identify skin sensitizers in chemico was developed by using cysteamine, an endogenous substance that contains amino and thiol groups. To quantitate remaining cysteamine following the reaction with skin sensitizers, 5,5’-dithiobis-(2-nitrobenzoic acid) (DTNB) was selected for the derivatization. The conditions optimized included: incubation time of cysteamine with test substances, molar ratios of cysteamine to test substances, stability of derivatized products of test substances with optimal concentration and incubation time of DTNB, and spectrophotometrical characteristics of the derivatized product. With the optimized conditions, 11 skin sensitizers and non-sensitizers were tested to know whether the method is feasible or not. Although further optimization is required, it would be a useful screening tool for determining skin sensitization potential of small molecules, because the present method employs simple endogenous cysteamine as an acceptor for sensitizers with a spectrophotometric detection system,.
차동호(Dong-Ho Cha) 한국비평이론학회 2009 비평과이론 Vol.14 No.1
This paper focuses on the eurocentric ideology of universalism in J. W. Goethe's "World Literature" paradigm, which has been a comparatist manifesto in the department of western comparative literature since its foundation. Goethe insists that "national literature is no longer of importance, it is time for world literature." It means that the phenomenon which he calls world literature will come about mainly when the disputes within one nation are settled by the opinions and judgements of others. So, western comparative literature studies claim to stand for the principles of universalism of Goethe's world literature, which totalize international literary works across linguistic, territorial, and national particularities. In the early twentieth century, this kind of literary universalism seems to go beyond the european nationalism, which has produced the nation-centric tendency since the eighteenth century. However, simple universalism cannot be the eventual alternative to particularism is not defined by the transcendental separatism, but rather by the correlative, situational position of the viewer. For example, a certain cultural category looks like universal to the interior inhabitant, whereas looks like particular to the exterior inhabitant. In the instance of nation, national culture and identity functions to bind together heterogenic members into the single national group, but in the instance of the global, national culture and identity functions to differentiate distinctive national groups. Universalism and particularism are not divided into the absolute opposite ends. They are not only connected to each other, but also maintain the immanent relation. Behind the universalism of Goethe's world literature, there exists an ambivalent collusion with particularism, which might result in any kinds of centrism. According to Goethe's remark of "a European, indeed a world literature," his concept of world literature is not a universal category that includes all of the world nations, but rather a limited category that includes only european nations. So, it is inevitable that the universal appeal of world literature should be questioned by the ideological inspection. In fact, Goethe, and then western comparative literature' universalism is related to the european imperial expansion in the nineteenth century. The european expansion into the outside of Europe makes any kinds of universalistic claim because expanding far beyond the continent of europe offers the possibility that bind together each of european nations into the single Europe. Therefore, we must have a doubt about the real meaning and intention of all kinds of universalistic claims, revealing the limitations of those, and thereby promise that the more universal universalism could make its appearance.