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식이 ω3지방 섭취가 발달과정의 뇌지질 지방산 축적에 미치는 영향을 조사하기 위해 ω3지방산이 다량 함유된 고등어유, 들깨유와 비교군으로 콩기름, 쇠기름, 채종유의 5종류의 식이지방을 식이중에 10%로 제조하여 섭취게 한 후 태아, 수유, 이유기를 거치는 동안의 뇌지질 지방산 구성변화를 추적하고 cholesterol 함량과 acetylcholinesterase활성을 측정하였다. 그 결과 뇌조직 지방산중 포화와 불포화지방산은 모두 지속적으로 축적되며 C18:2(ω6)나 C18:3(ω3)같은 short-chain 전구체의 비율은 상대적으로 감소되는 반면 그 long chain유도체의 비율은 증가하여 정량적으로 축적되었다. 특히 C22:6(ω3)의 축적이 타지방산에 비해 많으며 고등어유군에서 계속 높은 경향으로 이는 C20-22 (ω3)지방산의 incoproation율이 타 식이지방의 주요지방산보다 뚜렷이 높음을 뜻한다. 반면 들깨유군에서는 C20:5(ω3)의 elongation은 활발하게 C22:6(ω3)까지의 elongation은 원할치 않다는 것을 나타낸다. Cholesterol함량과 acetycholinesterase 성분은 전 발달과정 동안에 증가하는 경향이었으며 cholesterol 함량은 고등어유군과 쇠기름군에서 높았고 acetylcholinesterase 활성은 각 군간에 큰 차이가 없었다. Male nad female Sprague-Dawley rats(~70g) were fed five different diets containing various dietary fats and at the level of 10%(w/w). Dietary fats used were mackerel oil(MO), perilla oil(PO), soybean oil(SO), repeseed oil(RO), and beef tallow(BT). After 34days of feeding experimental diets, when rats weighed about 200g, male and female rats were mated. Experimental diets were continued throughout pregnancy and lactation of female rats and weanling period of the offsprings. Fatty acid composition and cholesterol content of brain lipid were measured as well as activities of acetylcholinesterase during fetal(day-10, -5), neonate(day 0) and postnatal (day 17, 26, 39) periods. Both saturated and unsaturated fatty acids of brain lipid were progressively elongated from fetal(day-10) to postnatal(day 39). Levels of ω3, ω6 and ω9 fatty acid were notably high in MO, SO, and BT group respectively. In PO group, the level of C20:5(3ω) was higher while the level of C22:6(ω3) was almost the same, as other groups, suggesting that elongation of C18:3(ω3) to C20:5(ω3 is active but not to C22:6(ω3). On the other hand, C22:6(ω3) in MO was very well incorporated in to brain lipid as such. Cholesterol content and acetylcholinesterase activity were increased during the whole period of development. Cholesterol content was highest in MO group. However, acetylcholinesterase activities did not between groups.
In this paper, we designed a dynamic presentation of simple algorithms as a learning concept. The usual methods of learning algorithims have been to depend on text mode presentation. Contrary, this dynamic presentation of algorithms' flow is expected to enable the learners can more effectively grasp the algorithm pattern and easily understand its concept. The study was carried out by selecting the Euclid's algorithm as an example under an authorware tool environment. The designed learning system includes four modules ; the outline of algorithms as the basic part, the transforming process between random input data and their outputs, the detail part of the algorithms selected by the learners, and the program coding for desired language. It seems that the proposed dynamic presentation will contribute to concentrate learners' interest, and to improve both the formulation of algorithm concept and the ability of program coding.
The purpose of this study is to develop the estimation model of 'Environmental Satisfaction'. A questionnaire survey was carried out for the study area of Taegu-Kyungbuk region. Sampling size was 838 residents(427 in Taegu and 411 in Kyungbuk) selected by stratified sampling of each sampling area's population. The survey was done from Sep. to Nov. 1996. The proposed model was composed of four estimation categories and 16 indicators. The four categories were 'Clenness & Quietness', 'Naturalness & Harmony', 'Beauty & Comfort' and 'Environmental Conservation Efforts'. And each category has several individual indicators. Means of environmental satisfaction by indicators were different by sampling areas. In 'Total Satisfaction', Suseong-gu(3.01), Nam-gu(2.82)(Taegu), Kimcheon(3.32), and Cheondo(3.31) (Kyungbuk) showed high environmental satisfaction, but Dong-gu, Seo-gu(Taegu), Youngcheon, and Pohang(Kyungbuk) showed lower environmental satisfaction. According to weighting values by each indicator, 'Cleanness of Air' (X1), 'Familiarity to Green Areas' (X6), 'Comfort of Traffic' (X12), and Env. Protection Efforts' (x15) were the most important indicators in each category.
Asynchronous Transfer Mode(ATM) has been proposed as the target switching and multi-plexing schemes for broadband ISDN(B-ISDN). A variety of traffic types such as voice, data and video can be integrated into the network. Among the traffic types, video requires a significantly higher bandwidth than voice and data. Since video will be a major traffic component in the future multimedia communiation, transporting video traffic in a very efficient manner will be the key point for the successful implementation of B-ISDN. Therefore, the characterization of video traffic sources are essential for the design of traffic control algorithms in ATM networks. The knowledge of bit rate statistics are necessary for the proper bandwidth allocation algorithms in the ATM networks. Since VBR(Variable Bit Rate) video transmission can be achieved taking advantages of the inherent burstiness of video sources, VBR encoding algorithms are well suited for the ATM networks. VBR video transmission also provides uniform quality video by transmitting at a higher rate during high-activity scenes and at a low rate when there is less motion. As the bit rate is not a constant, it is necessary to develop some statistical models in order to represent cell arrivals from video sources. The bit rate generated by a VBR coder depends on the type of video scenes, video coding algorithms, and video quality requirements. A video source model should have simple and effective parameters for performance evaluation and traffic control of ATM networks. In this paper, some video models are surveyed and reviewed. A video model was chosen and simulated. The simulation results are shown in order to illustrate some generated bit pattern of video sequence. Some of the results found may also be used for the design of efficient traffic control algorithm in ATM networks.
As a part of an effort to solve the software crisis, the productivity of qualified software has been emphsized. But there are no effective methodology to meet this growing demands. One promising method for increasing productivity of software seems to be writing of software components, such as attributes desiging information, modules and source unit, then reusing it. In this thesis, We infer the some problems of reusing the software components, suggest reusable methodologies and study th CARS(Computer Aided Reusable System).
Compactin, isolated from Penicillium brevicompactum by Brown and from P. citrinum by Endo, has hypocholesterolemic activity. The key structure of its activity was known β-hydroxy δ-lacone portion. In our ex-periments, 6, 7-O-dibenzyl-1, 2-O-isopropylidene-1, 2, 6, 7-tetrahydroxy-hept-3-ene(Ⅷ) was synthesized as intermediate for synthesis of β-hdyroxy δ-lacone por-tion. 4-Hydroxymethyl-2-penyl-1, 3-dioxane(Ⅰ) was prepared by the reaction of (S)-(-)-1, 2, 4-butantriol and benzaldehyde dimethylacetal and 4-(O-benzylmethyl)-2-phenyl-1, 3-dioxane(Ⅱ)was obtained by reductive cleavage of compound(Ⅱ)with LiAlH_4 and AlCl_3 anhydrous. 1, 2-O-dibenzyl-1, 2-dihydroxybutyl bromide(Ⅳ) was prepared from compound(Ⅲ_a) by bromination with N-bromosuccinimide(NBS) and the reaction of compound(Ⅳ) and triphenylphosphine produced 1, 2-O-dibenzyl-1, 2-dihydroxybutyl tri-phenylphosphonium bromide(Ⅴ). On the other hand, the reaction with d-mannitol and 2, 2-dimethoxypropane produced 1,2: 5,6-bis-O-isopropylidene-d-mannitol(Ⅵ), and (s)-1, 2-isopropylidene glyceral-dehyde(Ⅶ) was synthesized by the reaction of lead tetraacetate and compound(Ⅵ). The Wittig reaction with phosphonium salt(Ⅴ), glyceraldehyde(Ⅶ) and n-butyllithium pro-duced compound(Ⅷ). The structures of these compounds were identified by means of ^1H-NMR, ^13NMR and IR spectra.
In software industry, coexist the software crisis occurring continuously with methodologies and tools for overcoming it. Since 1980's, software reuse and object-orientation have been hot issues in software engineering. Object-oriented methodology can meet user's need concentrating on convenience of development process. By dealing with software product at the component level and by focusing on arbitrarily abstract description of component, software reuse allows user to deal with minute detail. Also, by dealing with software design at the architecture level, it supplies the automation principle of what must be taken in construction process. By hand, in distributed object environment, we can produce the economical software by accessing the data from different and various repository and sharing the data with different user because it support to development the client/server program and integrate existing systems in heterogeneous environment. We implemented the MT-views to utilize the reuse effects as reuse prototyping system or supporting including retrieval, understanding and rebuilding tools based on source code, documentation and etc., using CORBA on distributed object environment.
A multicast group is a collection of processes that are the destinations of the same sequence of messages. these messages may originate at one and more source sites and the destination processes my run on oner or more sites, not necessarily distinct. The multicast groups may overlap. A multicast protocol is responsible for the delivery of messages to the appropriate processes. some applications require that the protocol provide some guarantees on the order in which messages are delivered. The previous protocols occurred ordering violation and blocking because of site failure and message loss. this paper presents two fault-tolerant multicast message ordering protocols, called FT-ABCAST(Fault-Tolerant Atomic Broadcast Primitive) and FT-CBCAST(Fault-Tolerant Causal Broadcast Primitive) that solve a total and partial orders oof multicast messages. Both protocols have been analyzed as safety and liveness in the presence of communication and processor failures. Moreover, the FT-ABCAST uses an efficient communication scheme based on binary trees and requires N+2×[1gN] messages to create a total order of multicast messages in a distributed system with Nsites.
This paper presents an efficient test pattern generation for digital circuits by using neural networks which make use of a new update rule. a new update rule is based on the golbal optimization using both the steepest descent and the dynamic tunneling. The steepest descent is applied for high-speed update and the dynamic tunneling is also applied for global update. The neural network of the proposed update rule has been applied for test pattern generations to the parity generator to evaluate the performance. The simulation results show that the performance of proposed update rule is superior to that of the Hopfield model using the conventional update rule.
The purpose of this study was to obtain the basic data for designing the physiologically comfortable stocking. The study investigated physiological responses and wearing sensation of healty female adults in twenties in wearing support type stocking and socks according to ambient temperature and humidity in summer. The various factors, such as rectal temperature, skin temperature, body weight loss, blood pressure pulse rate, wearing sensation were statistically analyzed according to the warm temperature ambient condition and ensemble of clothes. The results were as follows : 1. Mean skin temperature showed significant differences with ambient temperature and clothes. In the low humidity and temperature, mean skin temperature was highest in support stocking in order high supporting stocking 〉socks. In the high humidity and temperature, no significant difference on ensemble of clothes was indicated at the end of exercise. 2. Under the certain ambient humidity, mean skin temperature increased in proportion to the increasa of ambient temperature in all ensemble of clothes under the certain ambient temperature, 70% RH higher mean skin temperature was indicated without relation to ensemble of clothes in high temperature. 3. Maximum blood pressure showed significant differences with the increase or decrease of ambient temperature. But, minimum blood pressure increased according to the decreased of ambient temperature. Pluse rate increased in proportion to the increase of ambient temperature during exercise. 4. Comfort showed 0.1% of significant differences with ambient temperature, clothes and time. Phychological responces showed 'very hot' 'very uncomfortable' as exercise and ambient temperature op up. Under the high humidity and temperature, high humudaty and temperature, high support stocking was most comfortable.