• Nuclear Engineering and Technology
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• 제5권1호
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• pp.44-54
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• 1973

In order to clarify an effective procedure of labelling organic chloro compounds by $^{38}$ Cl, phenyl chloro derivatives(7 kinds), chloro nitrobenzenes(6 kinds), chloro anisoles(2 kinds), chloro anilines(3 kinds), chloro toluenes(3 kinds), benzyl cholorides(4 kinds), and other comparing samples(3 kinds) were irradiated in the TRIGA Mark-II research reactor and the inorganic $^{38}$ Cl yields were compared with the irradiation times after extracting the inorganic portion with an aqueous solution of alkali. It was found that the relative change between the inorganic $^{38}$ Cl yield and the irradiadiation time depends a great deal on the state of the sample, and a solid sample gave a lower and steady inorganic yield. The inorganic $^{38}$ Cl yield was decreased in the order of phenyl chloro derivatives < chloro tol uene$^{38}$ Cl yield of homo functional compounds and the number of chlorine atoms on the benzene ring. Generally, poly chloro substituted derivatives could give a higher yield than those of less chloro substituted. The results were discussed and the feasibility of these results for labelling purpose was criticized.

• Korean Journal of Heritage: History & Science
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• 제46권3호
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• pp.48-67
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• 2013

This study was focused on the recognition of historical values and the establishment of conservation schemes for a Silla stone monument in Bongpyeong-ri, Uljin by combining the humanistic investigation of inscription reinterpretation and the scientific conservational diagnosis of deterioration. According to the investigation of inscription, a total of 13 letters were reconsidered compared to the preceding researches. Thus, the meaning and interpretation of previous inscription was partially changed. This monument is composed of gneissose leucogranite and the most suitable site as provenance of the stone would be the Jukbyeon seashore (2.1km). The site shows similar color, size and composition of minerals, gneissose structure and magnetic susceptibility as the Bongpyeong stone monument. This monument developed a structural crack (crack index 0.4) and a microcrack (crack index 2.0) along the gneissose structure. The horizontal strength is weaker than the vertical strength. Therefore, the cracks should be reinforced and treated. However, consolidating is not urgently needed because the total weathering grade by ultrasonic velocity shows the stage of moderate weathering(3,403m/s, 0.32). Also, the major problems of chemical deterioration are blackening (85.2%) with soil, iron oxide,rubbing mark, and salt crystals (17.3%) from the sea. Therefore, the contaminants and the salt crystals should be removed using pressure spray and pulp paper, while the application of poultice should be examined through clinical tests.

• Nuclear Engineering and Technology
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• 제44권3호
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• pp.225-236
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• 2012

The Fukushima-Daiichi accident shook the world, as a well-known plant design, the General Electric BWR Mark I, was heavily damaged in the tsunami, which followed the Great Japanese Earthquake of 11 March 2011. Plant safety functions were lost and, as both AC and DC failed, manoeuvrability of the plants at the site virtually came to a full stop. The traditional system of Emergency Operating Procedures (EOPs) and Severe Accident Management Guidelines (SAMG) failed to protect core and containment, and severe core damage resulted, followed by devastating hydrogen explosions and, finally, considerable radioactive releases. The root cause may not only have been that the design against tsunamis was incorrect, but that the defence against accidents in most power plants is based on traditional assumptions, such as Large Break LOCA as the limiting event, whereas there is no engineered design against severe accidents in most plants. Accidents beyond the licensed design basis have hardly been considered in the various designs, and if they were included, they often were not classified for their safety role, as most system safety classifications considered only design basis accidents. It is, hence, time to again consider the Design Basis Accident, and ask ourselves whether the time has not come to consider engineered safety functions to mitigate core damage accidents. Associated is a proper classification of those systems that do the job. Also associated are safety criteria, which so far are only related to 'public health and safety'; in reality, nuclear accidents cause few casualties, but create immense economical and societal effects-for which there are no criteria to be met. Severe accidents create an environment far surpassing the imagination of those who developed EOPs and SAMG, most of which was developed after Three Mile Island - an accident where all was still in place, except the insight in the event was lost. It requires fundamental changes in our present safety approach and safety thinking and, hence, also in our EOPs and SAMG, in order to prevent future 'Fukushimas'.

• Korean Journal of Ichthyology
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• 제24권3호
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• pp.177-182
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• 2012

Population sizes of an endangered species, Gobiobotia macrocephala (Cyprinidae, Gobioninae) were investigated in the Seom River, a tributary of the Han River drainage system, in Wonju-si, Gandgwon-do, Korea from September to October 2010. G. macrocephala occurred at 14 stations surveyed in this study and inhabited around the downstream riffles with pebble and coble bottoms. Its population sizes were estimated to be $8,295{\pm}4,922$ and $39,846{\pm}14,232$ individuals at two main stations using the mark-recapture method. The quadrat methods by a spoon net and snorkeling revealed that the population sizes were estimated to be 9,216 and 37,873 individuals, and 5,593 and 24,347 individuals, respectively.

• The Bulletin of The Korean Astronomical Society
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• 제40권1호
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• pp.52.3-53
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• 2015

The GMT-Consortium Large Earth Finder (G-CLEF) is a fiber-fed, optical band high dispersion echelle spectrograph that selected as the first light instrument for the Giant Magellan Telescope (GMT). This G-CLEF has been designed to be a general- purpose echelle spectrograph with the precisional radial velocity (PRV) capability of 10 cm/sec as a goal. The preliminary design review (PDR) was held on April 8 to 10, 2015 and the scientific observations will be started in 2022 with four mirrors installed on GMT. We have been participating in this preliminary design study in flexure control camera (slit monitoring system), calibration lamp sources, dichroic assembly and the fabrication of the proto-Mangin Mirror. We present the design concept on the parts KASI undertaken, introducing the specifications and capabilities of G-CLEF.

• Journal of Arbitration Studies
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• 제20권3호
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• pp.121-145
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• 2010

In the past, ADR has not been used as frequently in Japan as it has in other parts of the industrialized world. However, though litigation is still the most utilized vehicle of dispute resolution by Japanese financial institutions, this will be changing. The New Financial ADR system, which was created by a June 2009 amendment to the Financial Instruments and Exchange Act, is meant to deal with every stage of financial-related disputes and, as such, strives to resolve disputes before they become significant and acts to ameliorate any post-ADR issues that may remain, thereby completing the FIEA's purpose to protect investors. Since the foundation of the New Financial ADR system applies to all related industries, new provisions were set out in 16 business related acts, such as the Banking Act, the Insurance Business Act, and FIEA itself. October 2010 will mark the formal introduction of a new system of financial ADR in Japan. New Financial ADR in Japan will be modeled on the Financial Ombudsman Service in the United Kingdom, but will not feature one comprehensive dispute resolution system in which one dispute resolution institution covers all disputes in the financial field. The New Financial ADR system is merely one step towards a foundation of comprehensive financial ADR such as FOS. It must be noted, however, that this all important first step was over seven years in the making, involving a great deal of discussion, debate, and compromise amongst many parts of Japanese government, business, and society. The New Financial ADR system grants participating parties the ability to stop the clock on any statute of limitations which may correspond to any future possible court cases related to the dispute,13 and further grants the ability to suspend related court proceedings while the parties are utilizing the New Financial ADR system. In addition, where financial institutions have not accepted dispute resolution proceedings or have not accepted a special conciliation proposal, the Ministry of Finance may issue an order compelling compliance if it is found that certain actions are necessary to ensure the appropriate operations of a financial institution's business. In Japan, as best practices have not yet been created.

• Journal of Chest Surgery
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• 제53권5호
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• pp.263-269
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• 2020

Background: The benefits of epicardial ultrasound scanning (EUS) in coronary artery bypass grafting (CABG) have not yet been established. The aim of this study was to evaluate the usefulness of EUS in CABG, including in the assessment of the quality of distal anastomoses, the identification of epicardial target vessels, and the evaluation of any graft issues other than the distal anastomoses. Methods: Fifty-three patients undergoing CABG were enrolled between March 2018 and February 2019. Intraoperative EUS was performed along with transit-time flow measurement (TTFM). Graft evaluations were performed early (shortly after surgery) and 1 year after surgery for 53 (100%) and 47 (88.7%) patients, respectively. Results: EUS was applied to assess the quality of all distal anastomoses, 32 target vessels, and 2 conduit trunks. Insufficient TTFM findings were obtained for 18 grafts. However, graft revision was performed for only 3 distal anastomoses; based on the EUS findings, the remaining 15 sites were not revised. The early and 1-year overall graft patency rates were 100% (141 anastomoses) and 96.1% (122 of 127 anastomoses), respectively. All 15 of the distal anastomoses that were not revised despite insufficient TTFM results were patent at the 1-year mark. Conclusion: The routine application of EUS in CABG could be beneficial by confirming the quality of surgery and reducing unnecessary procedures.

• Journal of Korean Dental Science
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• 제11권1호
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• pp.14-20
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• 2018

Purpose: The purpose of this study is to measure and compare the removal torques of different cements applied in attachments of zirconia restorations on titanium (Ti) abutments fitted with retrievable cement-type slot (RCS) on the lingual side for the better retrievablity by use of a slot driver. Materials and Methods: Three types of cements were used in the experiment: two permanent cements in $RelyX^{TM}$ U200 (RU) (3M ESPE) which is a resin cement and $FujiCem^{TM}$ (FC) (GC) which is a resin-modified glass ionomer cement, and a temporary cement in $Freegenol^{TM}$ temporary cement (TC) (GC). Measurements of removal torques were conducted as follows; an attached sample was fixed on the equipment customized for the experiment; a slot driver was connected to a MGT12 (Mark-10 Corp.), a torque measurement instrument; the sample had the driver fitted to its RCS and then was rotated until the it was removed; and finally, the maximum torque value was recorded. Result: As for the removal torque measurement results, the average values were $47.9{\pm}2.6Ncm$ for RU, $43.4{\pm}1.5Ncm$ for FC, and $20.9{\pm}1.0Ncm$ for TC. The statistical analysis using Kruskal-Wallis test yielded the significance probability of P<0.05 (P=0.002), which confirmed the presence of significant differences between the three groups. Conclusion: All three cements exhibit clinically acceptable levels of removal torque when applied to an upper zirconia implant restoration fitted with a lingual slot, with RU and FC, the two permanent cements, having the significantly higher values than that of TC, the temporary cement.

• Journal of Korean Society of Forest Science
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• 제85권3호
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• pp.426-438
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• 1996

Whangchangkumpyo(黃腸禁標 : forbidden mark of whangchangmok pine tree cutting) is not only a historical forestry material but also a valuable physical proof supporting historical facts recorded in written documents. This study, using 6 whangchangkumpyo's which have been discovered so far, has investigated a comprehensive value of kumpyo(禁標). For this investigation, the location, sine, inscription, discovery of them and how they were reported have been compared with what is recorded in written documents. A comparative analysis of whangchangkumpyo and its investigation have enabled the author to identify the distribution of high quality pine trees, the political and economic significance of kumsan(禁山) and bongsan(封山) at the time, changes in geographical names over time, bits of tracks from old road network. Finally, it is suggested in this study that the recognition of the value of whangchangkumpyo should be more encouraged and the protection of it should be necessary.

• The Journal of the Korea Contents Association
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• 제9권12호
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• pp.891-899
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• 2009

We need education program and contents that satisfy on-off line's education maximize an initiative spirit development in an absence of UI design for infants and elementary students. For the multiplicity of inflection of these initiative spirit development education program, we need development of contents and teaching materials(Cre-kids) that can educate both in on-line and in off-line. Cre-kids are divided of four areas that are increased fluency, flexibility, originality and delicacy. Four areas are ideas of language, visual, making and computer. Through each area, we can develop children's systematic modeling idea ability. And we divide of fluency, flexibility, originality and delicacy each four areas and evaluate each aspect and mark for index. That is CDQ(Creativity Design Quotient). Through the evaluation result, we will be able to study about a modeling initiative spirit index.