• International Journal of Aeronautical and Space Sciences
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• 제5권1호
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• pp.39-45
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• 2004

The vibration characteristics of rotating machinery are directly related withits condition such as rotor types, thereby it should be acquired the information fromthe vibration signal so that operating conditions may be rationally decided.Accordingly, the study is to focus on developing the analysis for identifying theoperational feature of rotor systems. For this purpose the complex frequencyanalysis for identification, which utilizes the directionaI spectrum for effectiveidentification of rotor systems, is introduced. From this proposed method, theanalysis of dynamic model of the rotors is performed including the stabilitybehavior of the general rotor by Ftoquet theory. Through this process theexcitation methodology to identify the types of rotors is investigated and theeffective way to identification is also suggested.

• 한국주거학회:학술대회논문집
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• 한국주거학회 2001년도 학술발표대회논문집
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• pp.57-63
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• 2001

Because of giving the first consideration primarily to planning interior spaces and parking areas in multi-family housing, the pedestrian space, although an important factor, has come to be neglectful. Nevertheless, the design competitions introduced for the first time in 1980s have played significant roles in developing the flesh ideas and concepts in housing design. Because pedestrian spaces have been respectable modification as a result of generalizing, it is important to review the types applied in competitions until now. In this context, the goal of this study Is to classify the types of pedestrian space and analyze their design characteristics in the proposals of housing design competitions in 1990s.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2000년도 가을 학술발표회논문집(I)
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• pp.683-688
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• 2000

Nowadays, shotcrete plays an essential part in the construction of underground structures, and fiber reinforcement is so useful for increasing the toughness of the concrete that is spotlighted at tunnel or pavement construction. Therefore, many type of fibers have been introduced on the site and variety of tests have been developed to measure and quantify the improvements achievable in fiber reinforced concrete and shotcrete. Therefore, this study focuses on the flexural toughness according to the fiber types and appraisal methods. The major interests are fiber types, volume fractions and evaluation methods.

• 산업공학
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• 제12권2호
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• pp.274-284
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• 1999

This study is aimed at examining the relationship among the advanced manufacturing technology(AMT) types adopted in Korea, necessary strategic management activities for the selected AMT types and the performance of the AMT introduced. In order to identify such relationship, multivariate analyses are used based on the survey data collected from industry types such as metal processing and assembly, automobile parts, automobile assembly. electric and electronic devices. The study results indicate the following: (1) companies using CIM or ERP tend to be more prepared in terms of human resources; (2) companies adopted CIM and MRPII tend to demonstrate higher performance in terms of both organizational effectiveness and operational efficiency; (3) companies which adopted JIT or ERP perform better in terms of operational efficiency.

• 국제학술발표논문집
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• The 6th International Conference on Construction Engineering and Project Management
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• pp.387-391
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• 2015

Currently, there is insufficient research on the construction management performance since the CM system was introduced in Korea. For successful completion of construction projects, active use of construction mangers on projects is necessary by introducing construction management to the projects. In view of this, this study analyzed the annual CM performance from 1996 to 2013 but for the past 5 years from 2009 to 2013, a detailed analysis was carried out. For different sectors, CM performances were divided into public and private sectors, for project types, construction, civil and others, for project phases, pre-design, design, construction and post-construction phases, for contract types, sole and joint contract types, for project scale, the amount of the projects was taken into consideration and they were divided into large, medium and small scales and for the types of projects, they were divided into, shops, department stores, shopping centers, hospitals, government buildings, hotels, accommodation facilities, factories, buildings for workshops, office buildings, stadiums, playgrounds, schools and other construction types and all the data divided into such categories was analyzed. The results in this study can be used as a basic reference for studies in analysing construction management performances.

• Journal of Communications and Networks
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• 제7권3호
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• pp.313-324
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• 2005

The success of the IEEE 802.11 standard has prompted research into efficiency of the different medium access methods and their support for different traffic types. A modified version of the point coordination function (PCF) called modified PCF has been introduced as a way to improve the efficiency over the standard method. It has been shown through a simulation study and a mathematical analysis that channel utilization can be much improved compared to the standard, in case there is no so-called hidden station problem. However, under the hidden station problem, the efficiency of the modified PCF would obviously decrease. In this paper, some enhancements of the modified PCF are introduced. Firstly, we propose a retransmission process to allow frames involved in collisions to be retransmitted. Then, we propose a collision resolution mechanism to reduce the frame collision probability due to the hidden station problem. In addition, we propose a priority scheme to support prioritization for different traffic types such as interactive voice and video, and real-time data traffic in the modified PCF. To prevent the starvation of one low priority traffic, minimum transmission period is also guaranteed to each traffic type via an admission control algorithm. We study the performance of the modified PCF under the hidden station problem and the performance of the modified PCF with priority scheme through simulations. To illustrate the efficiency of the priority scheme, we therefore compare its simulation results with those of some standardized protocols: The distributed coordination function (DCF), the enhanced distributed channel access (EDCA), the PCF, and our previously proposed protocol: The modified PCF without priority scheme. The simulation results show that the increment of delay in the network due to the hidden station problem can be reduced using the proposed collision resolution mechanism. In addition, in a given scenario the modified PCF with priority scheme can provide better quality of service (QoS) support to different traffic types and also support a higher number of data stations than the previous proposals.

• 한국의류학회지
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• 제17권2호
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• pp.219-231
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• 1993

According to the literatures of marketing, psychology, and other related areas, the situational influences on consumers' decision-making process have been significant, thus increased explanatory power of consume behavior when introduced in a research as one of the independent variables. Considering the characteristics of clothing as a consumer goods, situational influences on clothing purchase behavior were expected to be significant. As the theoretical backgrounds of situational influences on clothing purchase behavior, this study was to propose the definition of sitution in Clothing & Textiles department, and to suggest the types of situational variables affecting clothing purchase process in consideration of the results of consumer behavior research and the research related to clothing. The results of this study suggested that the definition of situation, subjective situation or objective situation, should be adjusted to the purpose of research, and that the types of situations affecting clothing purchase process might be defined into three types; wearing situation, communication situation, and purchasing situation. It was also suggested that the empirical studies would be necessary to verify the results, and the conceptual framework for the types of situations and the personality characteristics related to the clothing purchase situation should be identified.

• 한국조경학회지
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• 제31권3호
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• pp.17-33
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• 2003

This study focuses on design method of the memorial park for the improvement of the funeral culture in Korea. Through the comparative analysis between domestic and overseas cases, this study articulates the issues that should be taken into consideration in the design of memorial park and categorizes such issues in accordance with their types. According to comparative analysis, the characteristics of domestic and overseas cases can be summed up as follows. Most of the overseas cases can be characterized with creative concepts and images in their designs because designs are not only based on the issues articulated in this study but also show a various patterns issue by issue. On the other hand, domestic cases do not show differentiated images from others, which results from the uniform design that disregards the issues articulated in this study. The memorial park for the future should be designed to play a significant role of citizens´ park under the new conceptual framework. Therefore, the issues articulated from this study should be reflected in the design of memorial park. In addition, various types by issue should be introduced to design of memorial park. The purpose of this study is to suggest basic criteria for the design of future pattern, not simply to compare the strength and weakness of different types. This study has a limitation in that it does not offer comprehensive information of what types of memorial park will coincide with the Korean's collective sentiment. Therefore, impending tasks of further researches should involve the opinion and preferences of citizens concerning the design of memorial park.

• The Korean Journal of Pain
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• 제2권2호
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• pp.189-193
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• 1989

The analgesic effects of epidural morphine were evaluated on various types of cancer-related pain in forty-eight adult patients. Epidural morphine injections were given via an epidural catheter introduced to an epidural level corresponding to the pain area. Pain relief was classified as excellent, fair, or poor by subjective scoring and by the subsequent need for systemic analgesics. Thirty-two patients of all the patients became pain-free. In sixteen patients, pain relief was complete only for one or two of various types of pain with a certain dose of epidural morphine, The best result was obtained when the pain was continuous and originated from deep somatic structures. Based on the results, the ranking order of different types of cancer pain with regard to their susceptibility to epidural morphine was as follows: 1) Continuous somatic pain 2) Continuous visceral pain 3) Intermittent somatic pain 4) Intermittent visceral pain The differential effects of epidural morphine on cancer-related pain may suggest that various types of noxious stimuli involve different kinds of opioid receptors which differ in affinity to morphine, and that there are some pain-mediating systems which function independently of opioid mechanisms.

• The Korean Journal of Ecology
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• 제25권4호
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• pp.205-211
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• 2002

For landscape ecological management of the isolated forestlands in Incheon city located in the western tip of South Korea, the forest vegetation of Mt. Cheolma was classified phytosciologically and mapped out its spatial distribution at a scale of 1:5,000. Characteristics of forest landscape structures were discussed in terms of the number and size of patches obtained by analy zing vegetation map. Units to manage the forest vegetation were categorized into eighteen communities, seventeen groups, and sixteen subgroups. Landscape elements were classified into five types: secondary vegetation, introduced vegetation for forestry (IVF), introduced vegetation for agriculture (IVA), and other elements. Two hundred and ninety-three forest landscape patches covers 443.3ha, of which IVF accounted for 316.8ha(71.5$\%$), the largest portion, secondary vegetation for 101.2ha(22.8$\%$), IVA for 6.2ha(1.4$\%$), and others for 19.1ha(4.3$\%$). The ratio of natural forest elements of 31.9$\%$ showed that this area was mainly comprised of artificially introduced vegetation, such as Robinia pseudoacacia plantation and Pinus rigida plantation. Forest landscape patches have a mean area of 4.5ha, a density of 66.1/100ha, and a diversity index of 0.87. It was estimated that differentiation of patches recognized in community level would be related to human interference and those in subordinate level to natural processes.