• Journal of Korean Clinical Health Science
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• v.3 no.4
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• pp.435-443
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• 2015

Purpose. This study was to investigate comparison of the near eye position according to the spectacle and contact lens wearing. Methods. We measured the AC/A ratio and near horizontal phoria using modified Thorington method in each case spectacle and contact lens wearing of equivalent spherical power after measuring the full corrected diopter for 20 subjects (men 5, woman 15, $21.15{\pm}1.35$ years) without specific ocular diseases, ocular surgery experience and vision anomalies. Results. It was shown high correlation between spectacle and contact lens wearing as AC/A ratio is a correlation coefficient 0.99 (p=0.00), near horizontal phoria is a correlation coefficient 0.95 (p=0.00). And contact lens wearing increased as AC/A ratio by $0.32{\pm}1.35$ ${\Delta}/D$ (p=0.31) and near horizontal phoria by $-0.17{\pm}2.18$ ${\Delta}$ (p=0.73) than spectacle wearing but there was no statistically significant difference. As the higher myopic grade AC/A ratio increased and then was shown decreased tendency in -6.00 D < $SED{\leq}-4.00$ D group (p>0.05) and as the higher myopic grade near exophoria increased but there was no statistically significant difference (p>0.05). Conclusions. We should consider that the subjects who had the lower AC/A ratio or higher near exophoria in -6.00 D < $SED{\leq}-4.00$ D group were necessary to measure AC/A ratio and near horizontal phoria when they were wearing contact lens because contact lens wearing tended to increase the near exophoria than spectacle wearing.

• Journal of Korean Tunnelling and Underground Space Association
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• v.22 no.5
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• pp.501-513
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• 2020

Cutter cutting tests for the cutter placement in the cutter head are being conducted through various studies. Although the cutter spacing at the minimum specific energy is mainly reflected in the cutter head design, since the optimum cutter spacing at the same cutter penetration depth varies depending on the rock conditions, studies on deciding the optimum cutter spacing should be actively conducted. The machine learning techniques such as the decision tree-based regression model and the SVM regression model were applied to predict the optimum cutter spacing ratio for the nonlinear relationship between cutter penetration depth and cutter spacing. Since the decision tree-based methods are greatly influenced by the number of data, SVM regression predicted optimum cutter spacing ratio according to the penetration depth more accurately and it is judged that the SVM regression will be effectively used to decide the cutter spacing when designing the cutter head if a large amount of data of the optimum cutter spacing ratio according to the penetration depth is accumulated.

• The Journal of the Korea Contents Association
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• v.10 no.3
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• pp.294-300
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• 2010

With the development of media technology, UCC actively working through the medium of the Net, the Internet space, which can influence politics instead of TV is drawing attention as the new leading media. As the one-sided media influence of TV is dwindling in the times of the Internet, the hegemony of the media is rapidly changing into UCC marked by two-way interaction. Especially, UCC has the characteristic that it has changed the people performing a role as the receptor of the media into the agent of enormous political influence as well as the freshness specific to its contents. This study was intended to investigate the types of diverse political influences of UCC in political practice as well as daily politics with a focus on the fact that it can newly project the world led by the media and their changes and exercise strong power in changing the society. Therefore, it attempted to investigate the political influence and ripple effect that UCC can exert by attempting to analyze what political influence UCC can exercise at diverse political situations including election. As a result, UCC led to four situations such as incentive-exploding type, issue-leading type, dispersion-switching type, direction-obeying type. This can be said to lead to the positive effect at the political field, such as implementing direct democracy through digital technology.

• Journal of Distribution Science
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• v.7 no.1
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• pp.55-70
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• 2009

There is under restructuring of whole distribution market in Mokpo recently. Large-Scale Discount Stores such as E-mart, Lotte Mart, Homeplus and Nonghyup Hanaro Mart entered successfully in the distribution environment in Mokpo. However, the small and medium distributors are falling rapidly, and traditional market is depressed. This status gives some positive effects to make one-stop, good price, good quality and great variety of shopping for saving the time and effort through changing the customers' life-style. This change, however, made the traditional market worse that played as the core channel for trading the local special products and an important role for local economic in retailing market. It is a threatening factor for that traditional market to recover the recession. The decline of traditional market and the bankruptcy of small retailing dealers accelerate the stagnation of local economic and commercial power. Therefore, it need a systematic and synthetical study to solve the negative factors for improving life of the local resident. This paper looked into the concept, issues and development strategy of traditional market that affect local economic development directly. It studied the customers' awareness for traditional market that was recently modernized the facilities in Mokpo. Particularly, based on the research material that was published last academic symposium, it looked about the issues and development strategy that could happen in traditional market not the market of a specific region but all over the country. Therefore, the purpose of this paper is that the central and local government and retailers get a help to make the efficient and useful development strategy through analyzing the effects of customers for modernizing the facilities of traditional market.

• Journal of the Korean Society of Food Science and Nutrition
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• v.45 no.8
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• pp.1114-1121
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• 2016

This study investigated the food components and antioxidant activities of dried Jerusalem artichoke (Helianthus tuberosus L.) with white and purple colors. For the proximate composition of dried Jerusalem artichoke, regardless of color, carbohydrate content was highest, followed by crude protein, ash, and moisture contents, and breed-specific differences were not detected. The highest mineral content of dried Jerusalem artichoke was potassium, followed by calcium, magnesium, sodium, and iron. The major minerals of white color sample were calcium, magnesium, and zinc, whereas those of the purple color sample were potassium, sodium, copper, and manganese, and no significant differences between the samples were detected. The main amino acid of dried Jerusalem artichoke was arginine, regardless of color, followed by asparagine, aspartic acid, and ${\gamma}-amino-n-butyric$ acid in order. Cysteine, leucine, and tyrosine were significantly (P<0.05) more abundant in the purple color sample than in the white color sample. In contrast, phosphoethanolamine was significantly (P<0.05) higher in the white color sample than in the purple color sample. Antioxidant activity was higher in the purple color sample than in the white color sample for all activities except the 2,2-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) assay methodology. Ferric-reducing antioxidant power and oxygen radical absorbance capacity assays at low concentrations of extracts found no differences between the two samples, although the purple sample at high concentration showed relatively high antioxidant activities.

• The Korean Nurse
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• v.31 no.5
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• pp.39-52
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• 1992

As society has changed, the demand for improved health care has increased. To keep up with this type of social need, professional nursing care is seeking to efficiently satisfy the care needs of human beings. The goal of clinical nurse is to meet nursing care needs of patients. This study was designed to survey attitudes of nursing profession of clinical nurses. The following specific 5 objectives were investigated and the attitudes of clinical nurses were determined. 1. The social position of nursing as a profession. 2. Factors influencing the development of nursing. 3. The future of nursing. 4. Their work. 5. Job satisfaction. The subjects consisted of 120 nurses who are working at 5 general hospital over 150 beds Ill CHONG NAM. The nurses were surveyed by means of a questionnaire from May 24 to Jun 15, 1992. The tool used for this study was based on earlier work by Lee, Nam Hi(1978) and Kim, Myong Hee(1984). Computer was used for Data Analysis. Frequency and Percentage were used to examine the genera] characteristics of the subjects. ANOV A and t.test were used to test the relation in characteristics of the subjects and attitudes Loward nursing prfession. The finding of this study were as follows; 1. Social position of nursing as a profession; The response with the highest agreement was "The professional nursing organization is less power. ful than the other professional organization" 3.333 points, and the response with the lowest agreement was "Nursing get a big salary" 2.225 points. 2. Factors influencing the development of nursing; the response with the highest agreement was "Hospital environment should be improved" 4.267 points, and the response with the lowest agreement was "Nurses satisfaction with salary"2.175 points. 3. The future of nursing; the response with the highest agreement was "Along the deveiopmem of science technique will be elevated educational state and graduate to needed in nursing" 3.958 points, and showed generally positive response toward the future of nursing. 4. Their work; the response with the highest agreement was "Work loading due to nursing staff insufficient" 4. 308 points, the response with the lowest agreement was "Nurses are unkind to patient" 2.508 points. 5. The subject's view regarding job satisfaction;it showed that "Interpersonal nursing staffs" 3.508 points, showed generally unsatisfactory response toward job satisfaction. 6. The relationship between the subject's attitudes toward professional nursing and general characteristics showed a significant difference statistically in regard to the field of work(P<.05). 7. The relationship between general characteristics and the subject's attitudes toward factors influencing the development of nursing showed a significant difference statistically in regard to the age and the status of position(P<.05). The subject's attitude toward the future of nursing showed a significant difference statistically in regard to the age and the period of nursing career and the field of work(P<.05, P<.005). The subject's attitude toward the job satisfaction showed a significant difference statistically in regard to the age and the period of nursing career and the status of position and the field of work(P<.005).

• Journal of the Korea Institute of Information and Communication Engineering
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• v.10 no.4
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• pp.659-666
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• 2006

Servo-motors are used as key components of automated system by performing precise motion control as accurate positioning and accurate speed regulation in response to the commands from computers and sensors. Especially, the linear brushless servo-motors have numerous advantages over the rotary servo motors which have connection with the friction induced transfer mechanism such as ball screws, timing belts, rack/pinion. This paper proposes an estimation method of unknown motor system parameters using the informations from the sinusoidal driving type linear brushless DC motor dynamics and outputs. The estimated parameters can be used to tune the controller gain and a disturbance observer. In order to meet this purpose high performance Digital Signal Processor, TMS320F240, designed originally for implementation of a Field Oriented Control(FOC) technology is adopted as a controller of the liner BLDC servo motor. Having A/D converters, PWM generators, rich I/O port internally, this servo motor application specific DSP play an important role in servo motor controller. This linear BLDC servo motor system also contains IPM(Intelligent Power Module) driver and hail sensor type current sensor module, photocoupler module for isolation of gate signals and fault signals.

• Journal of the Mineralogical Society of Korea
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• v.14 no.2
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• pp.99-110
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• 2001

A gem-quality yttria-stabilized zirconium oxide crystals were synthesized by the skull-melting method, using the RF electrical apparatus. Principal raw materials used were $ZrO_2$and 25 wt.% $Y_2O_3$as stabilizer and 0.03~0.05 wt.% $Nd_2O_3$decolorizing agent were added to it. The single crystals were approximately 20$\times$63 mm in size with chemical composition $Zr_{0.73}$ $Y_{0.27}$ $O_{1.87}$ . The crystals are isotropic with no appreciable anisotropism under a polarizing microscope. Their refractive indices are in the range of 2.15~2.18, specific gravity 5.85, Mohs' hardness 8~8.5, and reflectivity 13.47%. The zirconia crystals were confirmed to have cubic structure with Face-centered lattice(Z=4), space group Fm3m ($CaF_2$-type structure) and unit cell parameters are a=5.157 $\AA$. The optimal growing conditions for yttria-stabilized zirconia are 50 kW, 2.94 MHz in power and to use a crucible with 105 mm $\times$ 135 mm in size. When the lowering speed of the crucible was set 16mm/hr gave the best yield, 42%. Since the refractive index(2.15~2.18) of cubic zirconia is smaller than that of diamond, the angle between crown and pavilion should be fashioned to make it smaller than $40.5^{\circ}$ to show the maximum brilliancy and fire.

• The KIPS Transactions:PartC
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• v.11C no.7 s.96
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• pp.889-894
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• 2004

Most ad-hoc routing protocols such as AODV(Ad Hoc On-Demand Distance Vector) and DSR(Dynamic Source Routing) do not try to search for new routes if the network topology does not change. Hence, with low node mobility, traffic may be concentrated on several nodes, which results in long end-to-end delay due to congestion at the nodes. Furthermore, since some specific nodes are continuously used for long duration, their battery power may be rapidly exhausted. Expiration of nodes causes connections traversing the nodes to be disrupted and makes many routing requests be generated at the same time. Therefore, we propose a load balancing approach called Simple Load-balancing Approach (SLA), which resolves the traffic concentration problem by allowing each node to drop RREQ (Route Request Packet) or to give up packet forwarding depending on its own traffic load. Meanwhile, mobile nodes nay deliberately give up forwarding packets to save their own energy. To make nodes volunteer in packet forwarding. we also suggest a payment scheme called Protocol-Independent Fairness Algorithm (PIEA) for packet forwarding. To evaluate the performance of SLA, we compare two cases where AODV employs SLA or not. Simulation results show that SLA can distribute traffic load well and improve performance of entire ad-hoc networks.

• Resources Recycling
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• v.11 no.2
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• pp.36-44
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• 2002

The waste garnet powder as a raw material for clay bricks was studied its recycling. The physical strength of clay bricks are closely dependent both on the contents of $SiO_2$, $Al_2$$O_3$, and $Fe_2$$O_3$in clay and on the viscosity of it. Although the garnet power has very high contents of $SiO_2$, $Al_2$$O_3$, and $Fe_2$$O_3$, it could not substituted to clay because of its low viscosity. Therefore the substitution of sand with waste garnet powder was considered to influence positively on the strength of clay bricks .Mixing ratios of {clay-sand}, {sand-garnet powder}, and {clay-sand-garnet powder} based on weight were controlled in the production of clay bricks. The properties of clay bricks such as compression strength, moisture absorption, shrinkage, and specific gravity has been evaluated. It was shown that the optimal mixing combination was found to be { clay(50%)-sand(30%)-garnet powder(20%)} as a weight basis. The present study indicated possibilities to produce commercially clay bricks with the waste garnet powder. An economical benefit will be produced in viable in view of recycling waste garnet powder.