• 한국신재생에너지학회:학술대회논문집
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• 2005.06a
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• pp.638-642
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• 2005

For gas hydrate exploration, long offset multichannel seismic data acquired using by the 4km streamer length in Ulleung basin of the East Sea. The dataset was processed to define the BSRs (Bottom Simulating Reflectors) and to estimate the amount of gas hydrates. Confirmation of the presence of Bottom Simulating reflectors (BSR) and investigation of its physical properties from seismic section are important for gas hydrate detection. Specially, faster interval velocity overlying slower interval velocity indicates the likely presences of gas hydrate above BSR and free gas underneath BSR. In consequence, estimation of correct interval velocities and analysis of their spatial variations are critical processes for gas hydrate detection using seismic reflection data. Using Dix's equation, Root Mean Square (RMS) velocities can be converted into interval velocities. However, it is not a proper way to investigate interval velocities above and below BSR considering the fact that RMS velocities have poor resolution and correctness and the assumption that interval velocities increase along the depth. Therefore, we incorporated Migration Velocity Analysis (MVA) software produced by Landmark CO. to estimate correct interval velocities in detail. MVA is a process to yield velocities of sediments between layers using Common Mid Point (CMP) gathered seismic data. The CMP gathered data for MVA should be produced after basic processing steps to enhance the signal to noise ratio of the first reflections. Prestack depth migrated section is produced using interval velocities and interval velocities are key parameters governing qualities of prestack depth migration section. Correctness of interval velocities can be examined by the presence of Residual Move Out (RMO) on CMP gathered data. If there is no RMO, peaks of primary reflection events are flat in horizontal direction for all offsets of Common Reflection Point (CRP) gathers and it proves that prestack depth migration is done with correct velocity field. Used method in this study, Tomographic inversion needs two initial input data. One is the dataset obtained from the results of preprocessing by removing multiples and noise and stacked partially. The other is the depth domain velocity model build by smoothing and editing the interval velocity converted from RMS velocity. After the three times iteration of tomography inversion, Optimum interval velocity field can be fixed. The conclusion of this study as follow, the final Interval velocity around the BSR decreased to 1400 m/s from 2500 m/s abruptly. BSR is showed about 200m depth under the seabottom

• Journal of Cadastre & Land InformatiX
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• v.46 no.2
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• pp.183-196
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• 2016

Ground control points are needed for precision geometric correction of satellite images, and the coordinates of a high-quality ground control point can be obtained from the GPS measurement. However, considering the GPS measurement requires an excessive amount o f t ime a nd e fforts, there is a need for coming up with an alternative solution to replace it. Therefore, we examined the possibility of replacing the existing GPS measurement with coordinates available at online maps to acquire the coordinates of ground control points. To this end, we examined error amounts between the coordinates of ground control points obtained through Daum Map API, and them compared the accuracies between three types of coordinate transformation equations which were used for geometric correction of satellite images. In addition, we used the coordinate transformation equation with the highest accuracy, the coordinates of ground control point obtained through the GPS measurement and those acquired through D aum M ap A PI, and conducted geometric correction on them to compare their accuracy and evaluate their effectiveness. According to the results, the 3rd order polynomial transformation equation showed the highest accuracy among three types of coordinates transformation equations. In the case of using mid-resolution satellite images such as those taken by Landsat-8, it seems that it is possible to use geometrically corrected images that have been obtained after acquiring the coordinates of ground control points through Daum Map API.

• The KIPS Transactions:PartB
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• v.17B no.6
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• pp.421-428
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• 2010

It takes a long time for the users to view a whole image from the image server under the low-bandwidth internet environments or in case of a big sized image. In this case, as there needs a technique that preferentially transfers a part of image, JPEG2000 offers a ROI(Region-of-Interest) coding. In ROI coding, the users see the thumbnail of image from the server and specifies some regions that they want to see first. And then if an information about the regions are informed to the server, the server preferentially transfers the regions of the image. The existing methods requested a huge time to compute the mask information, but this thesis approximately computes the regions and reduces the creating time of the ROI masks. If each code block is a mixed block which ROI and background are mixed, the proper boundary points should be acquired. Searching the edges of the block, getting the two points on the edge, to get the boundary point inside the code block, the method searches a mid point between the two edge points. The proposed method doesn't have a big difference compared to the existing methods in quality, but the processing time is more speedy than the ones.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.19 no.2
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• pp.447-455
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• 2018

This study examined the effects of work values and the career decision level on the major commitment of the university students majoring in social welfare. For this purpose, a survey of 351 undergraduate students majoring in social welfare at 4 universities located in Kangwon-do was conducted and the data were analyzed. The work values consisted of intrinsic values and extrinsic values. The career decision level was measured by the career decision scale (CDS) and the major commitment was measured by the flow state scale (FSS). The research findings are as follows. First, the career decision level (3.43) and major commitment (3.58) of the university students majoring in social welfare were slightly higher than the mid-point on the 5 point Likert scale. In addition, the intrinsic work value (4.05) were higher than the extrinsic work value (3.34). Second, the intrinsic work values and career decision level were positively correlated with the major commitment. Third, the extrinsic work value had a negative effect on the major commitment (${\beta}=-.34$, p<.001); however, the intrinsic work value (${\beta}=.31$, p<.001) and career decision level (${\beta}=.18$, p<.001) had a positive effects on the major commitment. This paper also discusses the theoretical and practical implications for university student's work values, career decision level, and major commitment based on the research findings.

• Asian Pacific Journal of Cancer Prevention
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• v.17 no.3
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• pp.1293-1297
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• 2016

Cholangiocarcinoma (CCA) is a serious problem in Thailand, particularly in the northeastern and northern regions. Database of population at risk are need required for monitoring, surveillance, home health care, and home visit. Therefore, this study aimed to develop a geographic information system (GIS) database and Google map of the population at risk of CCA in Mueang Yang district, Nakhon Ratchasima province, northeastern Thailand during June to October 2015. Populations at risk were screened using the Korat CCA verbal screening test (KCVST). Software included Microsoft Excel, ArcGIS, and Google Maps. The secondary data included the point of villages, sub-district boundaries, district boundaries, point of hospital in Mueang Yang district, used for created the spatial databese. The populations at risk for CCA and opisthorchiasis were used to create an arttribute database. Data were tranfered to WGS84 UTM ZONE 48. After the conversion, all of the data were imported into Google Earth using online web pages www.earthpoint.us. Some 222 from a 4,800 population at risk for CCA constituted a high risk group. Geo-visual display available at following www.google.com/maps/d/u/0/edit?mid=zPxtcHv_iDLo.kvPpxl5mAs90&hl=th. Geo-visual display 5 layers including: layer 1, village location and number of the population at risk for CCA; layer 2, sub-district health promotion hospital in Mueang Yang district and number of opisthorchiasis; layer 3, sub-district district and the number of population at risk for CCA; layer 4, district hospital and the number of population at risk for CCA and number of opisthorchiasis; and layer 5, district and the number of population at risk for CCA and number of opisthorchiasis. This GIS database and Google map production process is suitable for further monitoring, surveillance, and home health care for CCA sufferers.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.18 no.10
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• pp.393-400
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• 2017

The purpose of this study was to examine the effects of major satisfaction and major commitment of undergraduate students majoring in social welfare on the intention to have a social welfare job. For this study, a survey of 442 undergraduate students majoring in social welfare at 4 universities located in Kangwon-do was conducted and the data was analyzed using the SPSS 22.0 program. Major satisfaction consisted of general satisfaction and satisfaction of subjects, and major commitment consisted of emotional commitment, behavioral commitment, intellectual commitment and time commitment. The research findings are as follows: First, 62.3% of respondents had an intention to have a social welfare job, and 21.6% were undecided. Second, the level of major satisfaction(2.98) and major commitment(2.63) were slightly higher than the mid-point of the 4-point Likert scale. Third, major satisfaction and major commitment showed a significant difference according to intention to have a welfare job and university attended. Fourth, major satisfaction and major commitment had a positive effect on the intention to have a social welfare job according to the results of binary logistic regression. This study concludes by discussing theoretical implications for future study and practical implications for major satisfaction and major commitment strategies based on our results.

• Journal of the Korean Society of Costume
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• v.61 no.4
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• pp.117-137
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• 2011

This study analyzed historical records on silk tabby-ju(細), Si(總)- in a diachronic and spatial point of view. The historical records were written in Samguksagi(三國史記) of Korea, Eastern barbarian[東弟] section of Ershiwush(二十五史) of China and Ritkokusi(六國史)of Japan from the $4^{th}$ century to the early $10^{th}$ century. The study finally could reach the conclusions as follow. Firstly, records that fabrics like Ju were used were found in the Korean historical documents written on Balhae(渤海) of the $8^{th}$ century and Sllla(新羅) of the $9^{th}$ century. On the other hand, no official record on production of fabrics like Ju was found in the Japanese historical documents up to the $10^{th}$ century. Instead, there are some records that Si was produced and used for the first time in the $7^{th}$ century and it was rapidly spread in the $8^{th}$ century. In the $9^{th}$ century, the number of records on Si was sharply decreased and the importance of Si in the foreign-relation point of view also went down gradually. Secondly, records on using and trading with both Ju(細) and Si(總)in the foreign relation of two countries were shown from the $8^{th}$ century to the $9^{th}$ century. In the period, international exchange had been promoted among Balhae, Silla and ancient Japan. In the $9^{th}$ century, fabrics like Ju of ancient Korea was introduced to ancient Japan ancient Japanese people could not manufacture Ju by themselves at that time. On this account, we assumed that ancient Japanese people might consider Ju as high quality fabric rather than Si that had been used as general fabric. Meanwhile, it is found that Japan presented various kinds of Si to Balhae and Silla from the early $8^{th}$ century. As the foreign relation between Sllia and ancient Japan got weaker in the mid-$8^{th}$ century, frequency and amount of supplying Si to Balhae were relatively increased. Besides Si, Balhae was given a lot of silk yarn and floss. These fabrics presumably were used as raw material of Ju in Balhae because Balhae got low output of silk due to its geographical condition.

• The Journal of the Korea Contents Association
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• v.13 no.7
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• pp.228-237
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• 2013

This study was conducted to contribute to career counseling and career guidance for universities students majoring in social welfare by examining how the career decision level and the career preparation behavior of the students are and the relationship between social work self-efficacy and the career decision level and the career preparation behavior of the respondents. For this study, the social work self-efficacy, the levels of career decision making and career preparation-related behavior of 502 students of social welfare in five universities were measured. The frequency analysis, correlation analysis, multiple regression analysis were used for collected data analysis. The research findings are as follows. Firstly, the levels of career decision making and career preparation-related behavior were slightly lower than mid-point on 5 point scale respectively. Secondly, social work self-efficacy was not correlated to their career decision levels while social work self-efficacy positively affected to the career-related behavioral levels. In particular, the client support self-efficacy of the three sub-factors in social work efficacy had a negative influence on the levels of career preparation behavior. Consequently, social work self-efficacy of the participants intensively was correlated with their career preparation-related behavioral levels.

• Journal of Acupuncture Research
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• v.27 no.1
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• pp.87-100
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• 2010

Background : Recently a discussion about Qi including a study about the effect or the theory of acupuncture is getting prevailing in various angles. In most of studies about acupuncture stimulus, 'Filiform acupuncture'(毫鍼) is used. A study about Nine kinds of acupuncture(九鍼), except 'Filiform acupuncture'(毫鍼) has not been reported yet, and there is no study about using a special acupuncture made for controling Qi either. Objectives : 'Dong Chu Gold Chim(DCG-chim, 東樞金鍼)' can be used for patients who are scared of a pain because it is a medical Qi-gong tool and non-invasive stimulus one. To assess a effect of Qi-gong operation using DCG-chim objectively Methods : The present study was performed to elucidate the effects of DCG-chim stimulation of an acupuncture point Baihui($GV_{20}$) on the Electroencephalogram(EEG). Twenty healthy subject were treated with DCG-chim one time accompanied by the light and vertical pressure and EEG were measured during five minutes for three times (before, during and after treatment). The EEG results of DCG-chim treatment were compared with those of 'Filiform acupuncture(毫鍼)'. Results : EEG power spectra changed significantly after both kind of acupuncture stimulation. Significant increase of $\alpha$ wave and decrease of $\beta$ wave were observed but interestingly, Mid-$\beta$ and SMR of $\beta$ wave which mean the state of concentration were increased with statistically significant. According to these results, DCG-chim stimulation of Baihui($GV_{20}$) seems to lead to relaxation with antianxietic effect and improvement of concentration at the same time. Conclusions : It would be expected that the doctor can apply DCG-chim for treating anxiety, tension, symptom caused by stress and also can use it clinically for patients who have needlphopia or children as a non-invasive procedure. It is suggested that additional studies about the effect of DCG-chim on other acupuncture points and comparison study about the effect of DCG-chim with those of the finger-pressure treatment using other tool should be done in the future.

• Phonetics and Speech Sciences
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• v.16 no.2
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• pp.99-109
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• 2024

Coarticulation is affected by the continuous movement of the articulator within a limited time and space through the neighboring segments and various overlaps. This study investigated the differences in coarticulation characteristics of children with reading disabilities and nondisabled children in CVC and VCV syllables consisted of stops, affricates, and vowels (a, i, u). The subjects were 13 children with reading disabilities and nondisabled children in the 2nd to 6th grades in elementary school. Two second formants were measured. One was measured at the point where the vowel began, and the other was measured at the mid point of the vowel stable section. Regression analysis was performed with F2 onset and F2 of the following vowel to obtain the locus equation (LE). 3-way ANOVA was conducted to the slope of the LE according to the groups (reading disabilities vs. nondisabled), places of articulation, and phonation types. In CVC syllable, dyslexic children showed a flatter slope than nondisabled children. With respect to the places of articulation, velar or bilabial sounds showed steeper LE slope than alveolar or palatal sounds. There were no main effects regarding group and phonation types variable for VCV syllable, and the significant differences in the places of articulation were also differed from the results for the CVC syllables. This study confirmed that dyslexic children showed a different pattern of coarticulation slope depending on the syllable structure. We also found that the higher pause rate of the dyslexic children had a stronger effect on the coarticulation in VCV structures.