• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2001.05c
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• pp.101-105
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• 2001

For high voltage XLPE power cables, semiconducting layers have been applied to prevent discharge at the interface between conductor and insulation, and/or insulation and external shielding layer. The semiconducting layers may be also effective to release electrical stress in the interface. The property of semiconducting layers are significantly related to the quality and reliability of power cables. Generally, these semiconducting layers are formed by extruding, the conductibility of the material is given by the carbon black mixed with base polymer. The life of power cables is depended on the smoothness of the interface between insulation and semiconducting layer. If the smoothness is no good, the life of power cables is shorter because the electrical stress and water tree is increased. The causes of no good smoothness are the void of the interface, the protrusions, the contaminants and impurities of the semiconducting layer. The selection and dispersion of the Carbon Black is the significant factor to determine the life of power cable in the manufacturing of semiconducting compound.

• Journal of the Korean Society of Food Culture
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• v.35 no.2
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• pp.201-214
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• 2020

This study was a qualitative investigation into hemodialysis patients' dietary practices. The purpose of this study was to explore the obstacles and requirements to maintain a recommended diet therapy in hemodialysis patients. Five patients undergoing hemodialysis in the renal chamber of the general hospital were interviewed individually. The interviews were based on an interview guide and analyzed by Giorgi's method of analysis. As a result of this study, five elemental factors and 12 subelemental factors were derived. Derived elements were "difficulty in dietary guidelines", "recognizing necessity of diet therapy", "awareness of importance of diet", "difficulty practicing diet therapy", and "looking for ways to practice diet therapy". Patients not only felt difficulties in practicing dietary guidelines but also recognized the need and importance of diet therapy. Patients seemed to have difficulty practicing meal therapy and eating with their families or others. They were also stressed by the limited selection of dietary components and rapid dietary changes before and after dialysis. However, patients showed a willingness to implement dietary management to improve their quality of life and to practice dietary therapy. In order to improve the practice of dietary management in hemodialysis patients, nutritional education should be focused on long-term dietary habits through continuous education and monitoring, not just one-off education. Moreover, patients should be educated that adherence to dietary control may be less burdensome on their families.

• Smart Structures and Systems
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• v.6 no.3
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• pp.197-209
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• 2010

The structural state of a bridge is currently examined by visual inspection or by wired sensor techniques, which are relatively expensive, vulnerable to inclement conditions, and time consuming to undertake. In contrast, wireless sensor networks are easy to deploy and flexible in application so that the network can adjust to the individual structure. Different sensing techniques have been used with such networks, but the acoustic emission technique has rarely been utilized. With the use of acoustic emission (AE) techniques it is possible to detect internal structural damage, from cracks propagating during the routine use of a structure, e.g. breakage of prestressing wires. To date, AE data analysis techniques are not appropriate for the requirements of a wireless network due to the very exact time synchronization needed between multiple sensors, and power consumption issues. To unleash the power of the acoustic emission technique on large, extended structures, recording and local analysis techniques need better algorithms to handle and reduce the immense amount of data generated. Preliminary results from utilizing a new concept called Acoustic Emission Array Processing to locally reduce data to information are presented. Results show that the azimuthal location of a seismic source can be successfully identified, using an array of six to eight poor-quality AE sensors arranged in a circular array approximately 200 mm in diameter. AE beamforming only requires very fine time synchronization of the sensors within a single array, relative timing between sensors of $1{\mu}s$ can easily be performed by a single Mote servicing the array. The method concentrates the essence of six to eight extended waveforms into a single value to be sent through the wireless network, resulting in power savings by avoiding extended radio transmission.

• Journal of Digital Convergence
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• v.14 no.11
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• pp.107-113
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• 2016

This paper proposes various policies for maximizing the performances of Government loan. In order to do so, this paper offers new 10 policies with results from analyzing a survey for the requirements of SMEs that were supported with Government loan program. Also this paper drives methods for finding new value indices and reforming formulas for quantifying some indices. On the other hand, this paper introduces financing methods using K-OTC and KONEX markets and presents three portal sites to provide information about Government sponsored loan matched to needs of an individual company. Also this paper improves the supplement points resulted from operating Government loan. In conclusion, these new policies will raise effectiveness and efficiency of Government loan programs and will contribute to achieving the goals which are establishing the foundation for growth in IT industry as well as IT SMEs, improving the quality of the national livelihood and promoting the growth of national economy.

• Journal of the East Asian Society of Dietary Life
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• v.21 no.3
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• pp.311-324
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• 2011

This study was performed to assess the nutritional status of low income elderly women aged ${\geq}$65 years residing in Gyeongnam Masan (n=124). Nutrition intakes, food intake frequency, and health-related behaviors including smoking, drinking, and exercise were investigated. Nutrition intake was calculated by the 24-hour recall method using CAN-pro (ver. 3.0). Average daily intakes of energy were $1,142.3{\pm}39$ kcal (71.4% of EER) in subjects aged 65~74 years and $1,071.0{\pm}41.7$ kcal (66.9% of EER) in subjects aged ${\geq}$75 years and the subjects consumed energy less than both 75% of estimated energy requirement (EER). The proportions of energy derived from protein, fat, and carbohydrate were 15.4:15.5:70.6 (aged 65~74 years), and 15.3:13.4:70.8 (aged ${\geq}$75). Nutrients consumed at less than estimated average requirements (EARs) were Ca (60.4%), P (98.4%), Zn (91%), vitamin E (48% of adequate intake, AI), vitamin $B_1$ (63.3%), vitamin $B_2$ (54%), niacin (87.7%), vitamin C (62.5%), and folate (50.5%). Especially, the intakes of Ca (58%), vitamin E (41% of AI), vitamin $B_1$ (60%), vitamin $B_2$ (50%), folate (46.5%), and vitamin C (54%) were 75% less than the EAR for people aged ${\geq}$75 years. According to the food intake frequency survey, the intakes of calcium, milk, fruits, and vegetables were very poor. In conclusion, this study suggests that a nutritional support program for elderly women of low socioeconomic class must be provided by the government to improve the quality of remaining life.

• The Research Journal of the Costume Culture
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• v.8 no.5
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• pp.629-637
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• 2000

This paper focuses on the development of a fashion design educational program that will foster the talent and aesthetic consciousness of fashion design students. The goal of progressive educational methods with cutting edge technology is to elevate educational efficiency, and ultimately rear creative designers. To fulfill its objective, this paper presents a courseware program on fashion design education utilizing hyper media that include animation, photographs, pictures, sounds and characters. By the utilization of such comprehensive source of information media, a hypermedia courseware was developed for elementary education in fashion design with the following conclusions : 1. The program enables the students to customize their fashion design education. The students of fashion design education programs are able to choose and adjust their own programs to suit their requirements and intellectual level. 2. The program effectively motivates. Much like a constant sequence of various images on a screen that can provoke profound heart-felt emotions and inspire creativity, the program can stimulate and motivate the students. 3. The program provides a consistent education. To advance the overall quality of fashion design education, the problem of dissonance in educational content should be resolved and possible individual errors in delivery rectified. The present program will solve such problems, and establish coherent standards that will withstand the test of time regardless of time or place. 4. The program is cost effective. Since the present program frees the teacher from the time consuming drudgery of preparing various texts and lesson plans, have the materials delivered and handled, it reduces the time and cost previously required. 5. The program has the capability to be upgraded. The accumulated know-how of teachers and the total experience of the program can be linked with other programs for limitless expansion.

• Proceedings of the Korea Society for Industrial Systems Conference
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• 2003.05a
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• pp.8-13
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• 2003

Historically, IP-based internets have been able to provide a simple best-effort delivery service to all applications they carry. Best effort treats all packets equally, with no service level, packet loss, and delay. But the needs of users have changed. The want to use the new real-time, multimedia, and multicasting applications. Thus, there is a strong need to be able to support a variety of traffic with a variety of quality-of-service requirements. The DiffServ architecture, proposed by the Internet Engineering Task Force(IETF), has become the most viable solution for provising QoS over IP networks. The DiffServ architecture does not specify any handling method between AF out-profile packets and BE packets. This paper propose a mechanism for supporting inter class fairness in the DiffServ architecture. Ⅰ proposed a modified Weighted Round Robin method to protect the BE traffic from AF out-profile packets in the core routers. The proposed technique is evaluated through simulation. Simulation results indicate that the proposed method provides better protection not only for BE packets from AF out-profile packets, but also for the AF in-profile packets in congested networks.

• Journal of Drive and Control
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• v.15 no.3
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• pp.14-20
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• 2018

Wet clutches in an automatic transmission enable the transmission of the engine power by the frictional torque experienced and noted between disk and plates. Since the clutch frictional torque considerably affects the shift quality of an automatic transmission as well as the durability of the machinery, its friction characteristics must be carefully examined to meet the design requirements. The SAE No. 2 friction test machine is a well-known standard to evaluate mainly the friction characteristics of plate clutches along with the required automatic transmission fluids. This paper reviews the experimental analysis of the wet clutch friction characteristics by using the exclusively developed clutch test machine which is capable of controlling the clutch test procedure, in accordance with the applicable test standard and processing of the experimental data automatically. As the clutch test machine is designed for the accommodation of dual clutches which is applied to the real transmission, it can evaluate not only the clutch friction characteristics, but also an actuation performance of a measured clutch piston. In respect to friction characteristics involving dynamic friction coefficients, the energy absorbed in a clutch disk and the recorded temperatures of clutch plates during braking actions and procedures are also investigated. Additionally, the change of friction coefficients by the use of the repeated clutch application is also observed with the endurance test functions of an accurately calibrated and dedicated clutch test machine.

• Journal of Korea Foundry Society
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• v.28 no.6
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• pp.256-260
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• 2008

The Hybrid-Lower Arm, which has been developed for reducing cost and weight, was produced by three kinds of casting methods such as the high-pressure diecasting(HPDC), the squeeze casting(SC), and the H-NCM rheocasting process. The important factors for development of the Hybrid-Lower Arm are the integral feeding in Al casting for heat treatment and the high joinning ratio between the steel part and the Al part. In this study, effects of these casting processes on the quality of Hybrid-Lower Arm were investigated. Compared with HPDC and squeeze casting, the rheocasitng process using the H-NCM slurry had some advantages in joinning different materials of Al and steel pipe without deforming the steel pipe. X-ray analysis also showed the poreless microstructure in semisolid Hybrid-Lower Arm. In the torsion stress test, semisolid Hybrid-Lower Arm was satisfied with the requirements of automobile standard.

• Journal of Fisheries and Marine Sciences Education
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• v.17 no.2
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• pp.218-227
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• 2005

Ocean resources have a very important role to meet the requirements of the people's leisure activities in a limited country, so fishing villages and fishing ports are getting more and more important as a source of supply to satisfy the demands as time goes on. There are various and far-reaching approaches to the fishing villages and fishing ports. However, studies to present the over-all direction of development policy for fishing villages and fishing ports have been short; especially the studies which have been dealing with Busan were verified to be very short relatively. As a result of survey, both officials in charge and residents in fishing villages have an enough understanding of what problems the development of fishing villages have and it's direction of development and spreading effects. In the part of the policy of developing fishing ports, officials answered that insufficient synthetic estimation was main problem in developing the fishing ports, while residents had a high recognition that local fishing ports and small scale fishing ports have had poor progress relatively. In the analysis of difference between two group about the spreading effects of developing fishing villages and fishing ports, they had affirmative opinions rather than negative ones without exemption. As mentioned above, it is a right direction to develop the existing fishing ports as well as new fishing ones to the multi-functional synthetic fishing ports. The specialized development should be made so that the special quality of coastal resources, which fishing villages have, will be made the best use of.