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Sangbok Lee,Jeongsoo Park,Seokhwan Lee,Kwanggyun Choi,Jaemin Lee,Seohyeon Lee,Sanguk Lee 한국방사성폐기물학회 2022 한국방사성폐기물학회 학술논문요약집 Vol.20 No.1
Appropriateness of the minimum detectable activity in the analysis of gamma radionuclides is very important. This is reason determine the time factor among the conditions of the analysis when it is rationally determined has the advantage that radioactivity analysis can be performed accurately and quickly. In this study, 100 mL of an unknown sample was diluted in Marinelli Beaker 1L to obtain, review data on gamma radiation analysis results and minimum detectable activity for each measurement time. The measurement was used High Purity Germanium detector, target nuclides are Co-57, Co-58, Y-88 and Cs-137. Since the radioactivity analysis sample will be expected to be the waste subject to selfdisposal or less during the radioactive waste classification, the minimum detectable activity standard was set based on the detection of less than the permissible activity for self-disposal for each nuclide. The measurement methods were measured by classifying it into seven categories: 1000 seconds, 3600 seconds, 10000 seconds, 30000 seconds, 80000 seconds, 100000 seconds, and 150000 seconds. The radioactivity from this measurement are Co-57 2.89 Bq·g?1, Co-58 0.19 Bq·g?1, Y-88 0.20 Bq·g?1, Cs-137 0.15 Bq·g?1, the measurement results under all conditions were similar. On the other hand, the minimum detectable activity showed values above the allowable activity for self-disposal in not but Co-58 at 1000 and 3600 seconds. Only after taking the measurement time of 10000 seconds, the result was derived Co-57 0.0095 Bq·g?1, Co-58 0.0068 Bq·g?1, Y-88 0.0052 Bq·g?1, Cs-137 0.0062 Bq·g?1, which was confirmed to less than the allowable activity for self-disposal by nuclide. Reasonably determining the measurement time in gamma radionuclide analysis is a very important issue in terms of economy of time and accuracy of measurement. Although this study cannot be said to be able to determine a reasonable measurement time for all gamma radionuclide analysis, it is hoped that research on various samples will be made to contribute to the efficient measurement of gamma radioactivity.
Comparisons of Traffic Collisions between Expressways and Rural Roads in Truck Drivers
Lee, Sangbok,Jeong, Byung Yong Occupational Safety and Health Research Institute 2016 Safety and health at work Vol.7 No.1
Background: Truck driving is known as one of the occupations with the highest accident rate. This study investigates the characteristics of traffic collisions according to road types (expressway and rural road). Methods: Classifying 267 accidents into expressway and rural road, we analyzed them based on driver characteristics (age, working experience, size of employment), time characteristics (day of accident, time, weather), and accident characteristics (accident causes, accident locations, accident types, driving conditions). Results: When we compared the accidents by road conditions, no differences were found between the driver characteristics. However, from the accident characteristics, the injured person distributions were different by the road conditions. In particular, driving while drowsy is shown to be highly related with the accident characteristics. Conclusion: This study can be used as a guideline and a base line to develop a plan of action to prevent traffic accidents. It can also help to prepare formal regulations about a truck driver's vehicle maintenance and driving attitude for a precaution on road accidents.
Lee, Sang Heun,Lee, Jaebok,Yoon, Young Joong,Park, Sangbok,Cheon, Changyul,Kim, Kihyun,Nam, Sangwook IEEE 2011 IEEE Transactions on Biomedical Engineering Vol.58 No.6
<P>This paper presents the design of a wideband spiral antenna for ingestible capsule endoscope systems and a comparison between the experimental results in a human phantom and a pig under general anesthesia. As wireless capsule endoscope systems transmit real-time internal biological image data at a high resolution to external receivers and because they operate in the human body, a small wideband antenna is required. To incorporate these properties, a thick-arm spiral structure is applied to the designed antenna. To make practical and efficient use of antennas inside the human body, which is composed of a high dielectric and lossy material, the resonance characteristics and radiation patterns were evaluated through a measurement setup using a liquid human phantom. The total height of the designed antenna is 5 mm and the diameter is 10 mm. The fractional bandwidth of the fabricated antenna is about 21% with a voltage standing-wave ratio of less than 2, and it has an isotropic radiation pattern. These characteristics are suitable for wideband capsule endoscope systems. Moreover, the received power level was measured using the proposed antenna, a circular polarized receiver antenna, and a pig under general anesthesia. Finally, endoscopic capsule images in the stomach and large intestine were captured using an on-off keying transceiver system.</P>
역사적 반성으로서의 드라마 -토마스 베른하르트 『은퇴 전에 Vor dem Ruhestand』 연구
이상복 ( Lee Sangbok ) 한국브레히트학회 2018 브레히트와 현대연극 Vol.0 No.39
In this paper, I looked at how the Nazi history was reflected in the Thomas Bernhard drama < Vor dem Ruhestand >. Rudolph Holler, who formerly hired Nazi officers and became chief justice, is having a birthday party Heinrich Himmler’s with his sisters every year. The drama of birthday party preparation, waiting and memory work is static because there is no clear dramatic ‘Super target’. This birthday party is a forbidden play. The role-playing characters are theatrical beings who have not secured their identity. The main character Rudolph lives in the present, but everything is in the past. In particular, he is subordinate to him like the envy of Strength. Vera, who relies on everything for her younger brother Rudolph, is only responsible for preparing forbidden plays. Clara, an antagonist in this drama, is a theatrical actor who is fond of his role in opposing Rudolf and Vera, who follow Nazi ideology, plays in this play. People who are centered in the past rather than the present make memories present through pictures that preserve the past time. Through this memory work, Nazi ideology is also becoming current. In particular, it is suggested that the crime of Nazism is true, as well as the post-war German society, which may reflect on memories through photography. The reflection of Nazi history in the past is evident from the language perspective of this work. Clara’s silence can be understood as a critique of the "social silence" that existed in postwar German society. Bernhard criticizes the postwar reality of Germany in which the forces that are obsessed with the past Nazi ideology are still ubiquitous even though the drama can not completely eliminate the wrong history. This reminds me of the message that Bertolt Brecht warned in the < Der aufhaltsame Aufstieg des Arturo Ui >: “Der Schoß ist fruchtbar noch, aus dem das kroch.”
이상복(Sangbok Lee),하동휘(Donghui Ha),이형진(Hyoung Jin Lee),노태성(Tae-Seong Roh) 한국추진공학회 2018 한국추진공학회 학술대회논문집 Vol.2018 No.12
액체 수소를 연료로 사용하는 팽창기 사이클 액체 로켓 엔진에 대한 성능해석을 수행하였다. 액체수소의 물성치는 온도에 따른 para 수소와 ortho 수소의 비율을 적용하였으며 펌프 및 터빈 전후에서의 물성치와 질유량 등을 계산하도록 구성하였다. Vinci 엔진의 성능과 비교하여 연소실과 노즐에서는 1% 이내의 오차를 나타내었고 펌프와 터빈에서도 압력 및 유량에 대해서 최대 오차 5% 이내의 결과를 나타내었다. Analysis of liquid hydrogen rocket engine using expander cycle has been performed. The thermodynamic Properties of hydrogen were determined by the ratio of para-hydrogen to ortho-hydrogen. The properties and the mass flow rate before and after the pump and the turbine were set to be calculated. Compared to the Vinci engine performance, the errors are less than 1% in the combustion chamber and the nozzle, and less than 5% in the pumps and turbines about mass flow rate and pressure.