• Journal of the Korean Solar Energy Society
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• v.34 no.1
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• pp.81-90
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• 2014

The Jeju-Korea power system is a small-sized network with a system demand ranging from a autumn minimum of 350MW to a summer peak of 716MW. Because Jeju island is well exposed to north-east winds with high speed, applications to connect to Jeju power system are flooded. Considering physical/environmental constraints, Jeju Self-governing Province has also target for the wind power capacity of 1,350MW by 2020. It amounts to two or three times of Jeju average-demand power and wind power limit capacity announced by Korea Power Exchange (KPX) company. Wind farm connection agreements will be signed to maximize utilization of wind resource. In spite of submarine cable HVDC connected to Korea mainland, Jeju power system is independently operated by frequency and reserve control. This study reevaluates wind power limit based on the KPX criteria from 2016 to 2020. First of all wind power generation limit are affected by off-peak demand in Jeju power system. Also the possibility capacity rate of charging wind power output is evaluated by using energy storage system (ESS). As a result, in case of using 110MWh ESS, wind power limit increases 33~55MW(30~50% of ESS), wind power constraint energy decreases from 68,539MWh to 50,301MWh and wind farm capacity factor increases from 25.9 to 26.1% in 2020.

• Food Science and Biotechnology
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• v.14 no.4
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• pp.470-473
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• 2005

Starch was isolated from turnip (Brassica rapa L.), and to elucidate the structure-function relationship its structural and physical properties were characterized. Morphological structure of the starch was analyzed by SEM (Scanning Electron Microscopy). Most of the starch granules were spherical in shape with diameter ranging from 0.5-10mm. Apart from larger granules ($<10\;{\mu}m$) which dominated the population size of turnip starch, significant amount of small ($0.5-2\;{\mu}m$) and mid-size granules (${\sim}\;{\mu}m$) were also detected. It was revealed that presumably, erosion damages occurred due to the attack of amylase-type enzymes on the surface of some granules. Branch chain-length distribution was analyzed by HPAEC (High-Performance Anion-Exchange Chromatography). The chain-length distribution of turnip starch revealed a peak at DP12 with obvious shoulder at DP18-21. The weight-average chain length ($CL_{avg}$) was 16.6, and a large proportion (11.8%) of very short chains (DP6-9) was also observed. The melting properties of starch were determined by DSC (Differential Scanning Calorimetry). The onset temperature ($T_o$) and the enthalpy change (${\Delta}H$) of starch gelatinization were $50.5^{\circ}C$ and 12.5 J/g, respectively. The ${\Delta}H$ of the retrograded turnip starch was 3.5 J/g, which indicates 28.2% of recrystallization. Larger proportion of short chains as well as smaller average chain-length can very well explain relatively lower degree of retrogradation in turnip starch.

• The Journal of Korea Assosiation for Disability and Oral Health
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• v.9 no.1
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• pp.56-65
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• 2013

I participated in Academic Exchange Program(Action plan II) between KADH(Korean Association for Disability and Oral Health) and JSDH(Japanses Society for Disability and Oral Health) for 2 months from 3rd July 2012 to 2nd september 2012 in the Department of Hygiene and Oral Health, School of Dentistry, Showa University at Tokyo, Japan. I have observed their operation process and learned what dysphagia is and how it is consulted and taken care of as a therapy for patients with eating and swallowing disorders for two months in The department of special needs dentistry at Showa University Dental Hospital, Jonan Branch of Tokyo Metropolitan Kita Medical Rehabilitation Center for the Disabled, Smile Nakano Center, Tokyo metropolitan center for persons with disabilities in Lidabashi for one week, Eating and swallowing functional therapy workshop for disabled children, Tokyo metropolitan Tobu medical center for Persons with Developmental/Multiple Disabilities located in Minamisunamitchi for one week and on The 17-18th JSDR(Japanese Society of Dysphagia rehabilitation) in Sapporo. Through Action Plan II program, I learned how precious eating, drinking and swallowing with ease are and observed how they do and what they do as a dentist or a dental hygienist in Japan for dysphagia patients. Therefore, I want to present the dental approaches of children with dysphagia in Japan, based on my experience for two months.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 1999.11b
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• pp.173-178
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• 1999

The Trellis Coded Modulation(TCM) allows the considerable achievements of coding gains compare with conventional multi-level modulation without compromising bandwidth efficiency. In this paper, we are presented a design of the parallel Viterbi decoder for 16-QAM TCM decoder with large constraint length (K=9), which can be applicable for the Digital Audio Broadcasting(DAB) receiver. As a mid-term result, a parallel Branch Metric Calculator (BMC)can compute 16 BMs within 3 clocks and a parallel 16 Add-Compare-Selects (ACS) unit can compute in a single clock. And also, two 256 Path Metric Memories (PMM) 32 Trace Back(TB) memories are specially designed with shuffle exchange switches for 16 parallel accesses. As a VHDL simulation, we can find the correctness of proposed model, which can be operated 16 S per symbol. Now, we are performing the hardware reduction for realtime operation and FPGA implementation.

• Journal of Agricultural Extension & Community Development
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• v.9 no.2
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• pp.199-213
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• 2002

The purpose of this study uses agricultural knowledge system theory to explore how the extension system in South Korea was developed and have worked well. By agricultural knowledge system we emphasized the dynamic networks of actors, processes of negotiation, and the diverse ways in which knowledge is constructed and performed. It was possible that individuals may participate in and utilize multiple knowledge systems. The knowledge systems reflected the idea that the boundaries between knowledge groups were not closed and that there could be considerable overlap between knowledge systems. The constructions of agricultural knowledge systems thus included social interactions, communication, and the diverse processes individuals employ to create, use, and evaluate multiple types and sources of information. As such, there were six priorities to development agricultural extension system; the linkage between agricultural colleges, Rural Development Administration(RDA), branch of RDA, establishing the research institution of research and extension linkage. exchange research agent with extension agent, developing information technology system, bottom-up approach, the linkage between national project and regional within extension projects, enforcement of informal learning.

• Journal of Distribution Science
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• v.11 no.6
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• pp.5-11
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• 2013

Purpose - The main question in this study is whether there is any relationship between corporate governance variables and earnings quality. The size of the board and audit committee, the number of stockholding managers and non-executive directors, and management quality are considered as independent corporate governance variables in the hypotheses. Research design, data, and methodology - Earnings quality is used as the dependent variable. Input from the abovementioned variables are drawn from 94 listed companies in the Tehran Stock Exchange for the period between 2006 and 2010. Results - This study examines corporate governance aspects such as the size of the board of directors, the number of shares held by the board, the board's independence, and the percentage of non-executive directors. The results show that establishing an audit committee has a significant role in ensuring higher quality reported earnings. Conclusions - The regression statistics output reveals a meaningful relationship between earnings quality and the size of the board of directors, the number of non-executive directors, and the size of the audit committee. This result indicates that improving earnings quality requires that the size of the board of directors be taken into account.

• The Journal of Asian Finance, Economics and Business
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• v.6 no.4
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• pp.45-52
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• 2019

The current study aims to investigate the relationship between tax avoidance and firm risk in an emerging market called Iran. The study population consists of 400 observations and 80 companies listed on the Tehran Stock Exchange (TSE) over a five-year period during 2012 and 2016. The statistical model used in this study is a multivariate regression model; besides, the statistical technique used to test the hypotheses proposed in this research is panel data. The results showed that low effective tax rate (tax avoidance) is more consistent than the higher effective tax rate. Moreover, there is no significant relationship between tax avoidance and future tax rate volatility. The findings also proved that lower effective tax rates are positively associated with future stock price volatility. This implies that since Iranian firms have many financial problems because of economic sanctions, they have a tendency to delay the disclosure of bad news about their firms. Needless to say, when a huge number of negative news reaches its peak, they immediately will enter the market and lead to a remarkable fluctuation in stock prices.

• Journal of Distribution Science
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• v.11 no.2
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• pp.5-10
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• 2013

Purpose - The current research examines the effect of life cycle stages on capital structure of listed companies in Tehran Stock Exchange. Research design, data, methodology - By aid of 685 year-company data, which collected from financial statements of companies during 2006-2012, first, the companies, are classified into three groups including companies in growth, maturity and decline stages. After removing the companies, which were not in accordance with life cycle model, 86 companies were selected to test two main hypotheses of the research. Results - The results show that the capital structure of the sample companies is different in various life cycle stages. More investigation by LSD test also revealed that the total debt to total assets ratio means of the companies in growth stages were significantly different from those companies in maturity stages and those in growth stages had high level of debt to assets ratio. Conclusions - The result showed the average amount of the working capital for companies in three stages are significantly different and due to high level of operation of the companies in maturity and decline stages, these companies held high amount of working capital than those in the growth stages.

• Journal of the Korean Society of Manufacturing Process Engineers
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• v.2 no.2
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• pp.52-59
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• 2003

Cam mechanism is a machine part frequently used in machinery. Specially, conjugate cam mechanism is very suitable for the high speed working and the heavy power translation. Then a conjugate cam mechanism need high precision for the relations between cam profiles and follower rollers. So, its design and manufacturing are very difficult. Thus, this study is a branch of exclusive CAM systems for design and NC machining of conjugate earn mechanism based on a master plate earn profile in order to exchange an old plate cam mechanism to a new conjugate earn mechanism. For the design of the other cam profile by using a master cam profile, some calculation processes were used by vector summation methods, from master cam profile data to the center data of master follower, from the center data of master follower to the center data of the other follower considered in link mechanism, and offsetting in the center direction of base circle of the other cam from the center data of the other follower. Finally, a sample conjugate cam was selected and machined m order to prove the contents of this study.

• Journal of the Korean Chemical Society
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• v.22 no.1
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• pp.25-29
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• 1978

Cobalt(III) complex containing ethylenediamine-triacetate and trimethylenediamine has been isolated from the reaction of ethylenediamine-tetraacetatocobaltate(III) with trimethylene-diamine in aqueous solution by Dowex 50W-X8, cation exchange resin in $H^+$ form. The ethylenediamine-triacetate($EDTRA^{3-}$) ligand coordinates to the cobalt(III) ion as a quadridentate with a free acetate branch. It has been observed that the complex has trans(O-O) (1) structure via the elemental analysis, UV, IR and NMR data.