• The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY
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• v.6 no.4
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• pp.218-224
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• 2001

Water movement in the Young San River Estuary where a sea dyke was constructed, was observed using anacoustic doppler profiler (ADP) and two TGPS buoys for 25 hours on 27-28 July 2000. Hydrographic observations were simultaneously taken using CTD to understand the characteristic of the spacial structure of temperature and salinity. A large quantity of fresh water was discharged from the sea dyke on 26 July 2000. The observation period fell on neap tide. The amplitude of the tidal elevation and the maximum velocity of the tidal current were about 4 m and 12 cm/sec respectively. The water movement at the surface layer is mainly controlled by wind, and those at the other layers are controlled by semidiurnal tide. The low salinity water less than 22 psu was observed along the northern part during the early observation period while southerly wind prevails. The less saline water moves westward and finally leaves the estuary by easterly wind early on the second day. We can divide the vertical structure into four layers by hydrography and current structure. Mean velocity structure shows that relatively less saline waters at the surface and the middle layer move seaward, and the waters at the upper and the bottom layers move landward. It is thought that the intermittent discharge of river water from the sea dyke makes vertical structure of four layers.

• Proceedings of the Korean Aquaculture Society Conference
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• 2003.10a
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• pp.29-29
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• 2003

In order to establish effective procedures for chromosome manipulation in Haliotis gigantea and H. discus, which are of enormous aquacultural potential, temperature-dependent measures of mitotic intervals ($\tau$$_{0}$) were determined. Mitotic intervals ($\tau$$_{0}$) in these abalone were determined by averaging the duration of the first and third embryonic divisions over a range of temperatures from 8 to 26$^{\circ}C$. The relationships of each mitotic interval at two cell ($\tau$$_{I}$), four cell ($\tau$$_{II}$ ), eight cell ($\tau$$_{III}$), sixteen cell ($\tau$$_{IV}$ ) and $\tau$$_{0}$, to temperature (T in $^{\circ}C$) in H. gigantea were log $\tau$$_{I}$ : 176.1-28.3T, log $\tau$$_{II}$ : 199.5-12.4T, log $\tau$$_{III}$ = 236.2-12.2T, log $\tau$$_{IV}$ = 269.3-14.lT and log $\tau$$_{0}$ : 83.1-32.8, respectively. The relationships of each mitotic interval at $\tau$$_{I}$, $\tau$$_{II}$ , $\tau$$_{III}$, $\tau$$_{IV}$ and $\tau$$_{0}$, to temperature in H. discus were log $\tau$$_{I}$ = 104.9-13.8T, log $\tau$$_{II}$ : 138.3-10.5T, $\tau$$_{III}$ : 172.4-10.2T, log $\tau$$_{IV}$ : 211.3-12.2T and log $\tau$$_{0}$=85.6-33.3T, respectively. There were strong, negative correlations between mitotic interval and water temperatures for all ten temperatures in these two species (H. gigantea: Y = -138.75 logX + 341.25, $R^2$ = 0.97; H. discus: Y = -112.33 logX + 255.22, $R^2$ = 0.98, where Y is mitotic interval and X is temperature).d X is temperature).rature).

• Journal of the Korean Arthroscopy Society
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• v.5 no.2
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• pp.116-119
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• 2001

Purpose : To describe long-term clinical results and serial changes in the postoperative range of motion(ROM) after arthroscopic treatment for a limitation of motion(LOM) of the elbow. Materials and Methods : The subjects who visited chosun university hospital from December, 1996 to January 2000 were twenty-one patients ranging from 37 to 54 years of age, and the average age was 43.2 years. The chief complaints were painful limitation of motion of the elbow and average ROM showed that flexion contracture were 17 degrees and further flexion were 87 degrees. Results : The total ROM was $70^{\circ}$ preoperatively. 2 months after postoperatively the mean flexion contracute improved from $17^{\circ}\;to\;3^{\circ}$ with further flexion from $87^{\circ}\;to\;122^{\circ}$ degrees. One year after postoperatively the mean flexion contracture were $5^{\circ}$ and further flexion were $113^{\circ}$. All patients reported a decresement in pain level as well as improvement in motion. There was no complication in this series. Conclusion : Arthroscopic surgery appear to be satisfactory management modality for degenerative elbow contractures.

• The Journal of the Convergence on Culture Technology
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• v.3 no.4
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• pp.35-42
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• 2017

Behavior Economics, a branch of social sciences, which seeks to find the answers about why man sometimes does absurd economy-related things, came into existence through combining economics and psychology. To the contrary of the traditional economics', behavior economics has developed by explaining how man makes economy-related choices by means of applying their own cognitive principles. Individuals lack the information on the goods and services in the market, and don't know how to make best use of the obtained information, failing to achieve maximum utility. Therefore, man's rationality is meant to be confined to bounded rationality. It is the very Heuristic that does work in the process of this simplified decision making process. Heuristic utilizes established empirical notion and specific information, and that's why there can be cognitive biases sometimes leading to inaccurate judgment. As Oral Literature is basically based on heavy guesswork and perceptual biases of general public, it is imperative to contemplate oral literature in the framework of Heuristic of behavior economics. This thesis deals with thinking types and behavioral patterns of the short-piece proverbs, folklore language-game riddles on the basis of personal or public memory. As a result, it is evident that proverbs point out biases arising from human behaviors, while riddles make full or active use of biases.

• Journal of Korea Spatial Information System Society
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• v.10 no.4
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• pp.27-35
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• 2008

Current re-arrangement of rivers and waterways have been made uniformly ignoring characteristics of individual rivers thereby aggravating artificial river restructuring. On the contrary, quantitative techniques to evaluate the aftermath of artificial river disturbance such as uprising of river bed, intrusion of foreign fisheries, and changes of ecological habitats are not available. To establish such quantitative techniques, analysis of the river changes to evaluate the major causes of the river disturbance and its impacts is essential. Therefore, research for proposing a method which can be applied for the development of techniques to investigate river disturbance according to the major factors for the domestic rivers using airphotos and GIS techniques was preceded. In this study, the study area on the downstream of the river was selected and analysis of river disturbance using preceding method was done to confirm the benefit of analyzing river disturbance using GIS techniques. Trend analysis of the waterway sinuosity and changes of the flow path leaded to detailed verification of the river disturbance for specific location or time period, and this enabled to generate relatively accurate numbers representing sinuosity of the waterway and relevant changes. Also, it is possible to predict the effect on the current re-arrangement of the river and waterway to river flow using the analysis of past river change. It is necessary to establish GIS based proper measures for environmental river restoration using the results from this study and future works.

• Korean Journal of Social Welfare
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• v.55
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• pp.27-54
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• 2003

This study examines the problems of children exposed to family violence. As a result, the children exposed to family violence exhibit various emotional, behavioral and social problems and distorted perceptions and inappropriate reactions toward family violence. Based on these results and existing programs for children exposed family violence, an integrative group program has been devised. The program was applied to two groups of the children and an experimental study was conducted to examine its effectiveness on emotional problems, aggressiveness, social skills and perceptions/reactions toward family violence. As a result, the experimental groups have shown an overall significant improvement in scores on emotional problems, aggressiveness, social skills and perceptions/reactions toward family violence. The study offers the following recommendations for clinical social work practice. First, great efforts to alleviating the problems of children exposed to family violence should be made continually. Second, special attention should be paid to reflect the characteristics of our own culture in clinical social work intervention and to do so, various practical intervention skills suitable to our culture should be developed. Finally, many different intervention models for children exposed family violence should be developed and researches comparing those models should be carried out.

• Progress in Medical Physics
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• v.18 no.3
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• pp.139-143
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• 2007

The purpose of this study was to measure and evaluate radiation dose for MDCT parameters. Patient dose for various combination of MDCT parameters were experimentally measured, using MDCT (GE light speed plus 4 slice, USA), model 2026C electrometer (RADICAL 2026C, USA), standard Polymethylmethacrylate (PMMA) head and body CT dosimetry phantoms. In clinical situations, for a typical abdominal scan performed with MDCT at 120 kVp, 180 mAs, 20 mm collimation, and a pitch of 0.75 $CTDI_w,\;CTDI_{vol}$ were measured as 20.2 mGy, 26.9 mGy, respectively. When scan length is assumed as 271.3 mm, DLP and measured effective dose of the abdominal would be calculated as $729.1\;mGy{\cdot}cm$, 10.9 mSv, respectively.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.11 no.9
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• pp.3538-3547
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• 2010

As Telepresence has emerged as a key collaboration tool for supporting trade business, the need for using Telepresence has also been increased in the foreign countries. In this context, we has studied an exploratory research to analyze how staffs-in-charges of trade support authority, exhibition & convention center and SME(Small and Medium-Size Enterprise) perceive the general concept of Telepresence, the necessity, feasibility, business values and expected problems of Telepresence's adoption and use. The finding indicated that there seemed to be significant differences between the necessity and the feasibility of Telepresence adoption and use. In addition, they were anticipating some problems when building Telepresence. Major reasons are incompatibility between Telepresence systems, lack of usability and difficulties of fixing a rental fee. The results of the perception analysis also showed that Telepresence would positively influence on creating business value. The analysis revealed that the core factors of the successful adoption and use of Telepresence are stable network environment, awareness and accessability, and education and promotion. Through the perception analysis, I came up with the core factors to implement Telepresence successfully and use it properly. And the fact that I presented the guideline to build Telepresence for SME makes this study meaningful.

• Journal of the Korean Arthroscopy Society
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• v.5 no.1
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• pp.32-35
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• 2001

Purpose : To evaluate the efficacy of arthroscopic management of the triangular fibrocartilage complex(TFCC). Materials and Methods : Thirteen patients(14 wrists) with acute or chronic traumatic triangular fibrocartilage complex lesions were included in the study. The mean patients' age was 28.3 years, with a range of 21 to 45 years. All patients were diagnosed by physical examination, arthrographic or magnetic resonance imaging studies. Eight of the 14 wrists had central TFCC tear while 6 wrists had peripheral tear. Under arthroscopic control, injuries to the central portions were treated by debridement and excision of unstable tissue fragment while peripheral tears were repaired. The follow-up period averaged 28 months. The results were analyzed clinically using the Mayo modification of the Green and O' Brien wrist scoring system. Results : Nine of the 14 wrists were rated excellent,3 good and 2 fair Overall, 12 of the 14 patients rated as satisfactory and returned to sports or work activities. Conclusion : Arthroscopic treatment of TFCC resulted in a high degree of patient satisfaction and an increase in the ability to perform at workshop.

• Journal of Energy Engineering
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• v.20 no.2
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• pp.90-95
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• 2011

This study was conducted to judge requalification of cylinders by assessing composite flaws such as scratches, cuts, and gouges damaging on the composite of Type III cylinders for compressed natural gas vehicles. As a result of the flaw tolerance test, all specimens have satisfied with minimum requirement cycles according to damage levels based on ISO 19078 and cyclic performance for pressure showed beyond twenty thousands in damage level 1 and 2, and did eighteen thousands to twenty-one thousands in damage level 3. Eight of twelve specimens failed the test due to composite flaws and the rest of the cylinders failed regardless of flaws. The results of Finite Element Method followed by the computer simulation indicated that the stress of 79.5 MPa calculated on the flaw model of $1.25\;mm{\times}200\;mm$ and the stress of 66.6 MPa on the non-flaw model when the service pressure applied to inside of cylinder. The difference between the models is about 19.37%. We concluded that this difference influences fatigue life and this flaw model is a critical value affecting cyclic performance of cylinders.