대한민국 해군 함정 내 석면 분포에 관한 연구

김정수 ( Jeong-soo Kim ),박종서 ( Jong-seo Park ),김성민 ( Sung-minkim ),박태윤 ( Tae-yun Park ),최성우 ( Sung-woo Choi ) 국군의무사령부 2012 대한군진의학학술지 Vol.43 No.1

Objectives : The aim of this study is to investigate the distribution of asbestos contained materials (ACMs) in the naval vessels of the Republic of Korea Navy (ROKN). Methods: Considering of the type of naval vessel and the year of ship-building, We investigated 15 naval vessels. All accessible compartments and pipelines in each naval vessel were examined. The data about the type of ACMs, number of sites, the condition of suspect material, potential of future disturbance (frequency of potential contact, influence of vibration, potential for air erosion) were collected. We also collected bulk and air samples of ACMs and analyzed their composition and concentration of asbestos fibers. Results : The type of ACMs was mainly textile, and partly powder and gasket. In all naval vessels(FF, PCC, PKM, etc) except Helicopter Destroyers(DDH) and submarines, ACMs were detected. The larger and the older naval vessels were, the more ACMs were found. In almost all compartments and pipelines, ACMs were detected. The condition of suspect material was good in general. But potential of future disturbance was relatively high. According to the results of the bulk sample analysis, the subtype of asbestos was chrysotile and the composition of asbestos was variable(from 1-2% to 90% over). The concentration of asbestos fiber in the air was very low (PCM : max 0.0016 f/cc, TEM : max 0.0049 s/cc). Conclusions : There were so many ACMs in the naval vessels of the ROKN. Therefore, the management plan of ACMs in naval vessels of the ROKN is needed immediately.

P179 The importance of ultrasonography diagnosing epidermal cyst and lipoma in dermatologic field

( Kihyuk Shin ),( Hyunju Jin ),( Hyang-suk You ),( Jeong-minkim ),( Woo-haing Shim ),( Hoon-soo Kim ),( Hyun-chang Ko ),( Byung-soo Kim ),( Moon-bum Kim ),( Gun-wook Kim ) 대한피부과학회 2016 대한피부과학회 학술발표대회집 Vol.68 No.2

<div style="display:none">fiogf49gjkf0d</div><div style="display:none">fiogf49gjkf0d</div><div style="display:none">fiogf49gjkf0d</div><div style="display:none">fiogf49gjkf0d</div><div style="display:none">fiogf49gjkf0d</div><div style="display:none">fiogf49gjkf0d</div><div style="display:none">fiogf49gjkf0d</div> Background: Ultrasonography (US) is a simple and reliable tool which can aid the diagnosis of benign subcutaneous lesions such as epidermal cyst and lipoma. Objectives: To determine the efficacy of US for the diagnosis of epidermal cysts and lipomas Methods: This study included 100 patients with epidermal cyst (n=45) or lipoma (n=55) who underwent US and then received a pathologic diagnosis in the dermatology department of Pusan National University Hospitals (Busan and Yangsan). Results: US and clinical impression accurately diagnosed the epidermal cyst in 90.0% and 88.0% of the patients, respectively, and the lipoma in 92.0% and 88.0% of the patients, respectively. US combined with clinical impression significantly increased the diagnostic yield of the epidermal cyst (98%; p=0.008 and 0.002, compared to US and clinical impression, respectively) and the lipoma (99%; p=0.016 and 0.001, compared to US and clinical impression, respectively). On US, frequency of posterior acoustic enhancement found in epidermal cysts was higher than lipomas (82.2% and 29.1%, respectively; p<0.001), and internal debris such as internal linear echogenic reflections or dark clefts was more frequently found in the lipomas than epidermal cysts (90.9% and 6.7%. respectively; p<0.001). Conclusion: This study implies that diagnostic role of US can be greatly enhanced by knowledge of the clinical presentation.

Attrition resistance and catalytic performance of spray-dried SAPO-34 catalyst for MTO process: Effect of catalyst phase and acidic solution

Min Kim,Ho-Jeong Chae,Soon-Yong Jeong,Tae-Wan Kim,Kwang-Eun Jeong,Chul-Ung Kim 한국공업화학회 2011 Journal of Industrial and Engineering Chemistry Vol.17 No.3

SAPO-34 is the most well-known catalyst for MTO (methanol to olefins) reaction because of its good selectivity to light olefins. However, SAPO-34 catalyst is rapidly deactivated by coke, and thus it should be used in circulating fluidized bed (CFB) reactors so that the deactivated catalyst can be continuously regenerated. To apply a catalyst into a CFB reactor, strong mechanical strength of the catalyst as well as good catalytic performance is critical. Therefore, in this study, fluidizable spherical SAPO-34 catalysts to be applied to MTO CFB reactor have been prepared through a spray-drying method, and a formulation composition has been optimized, including binders, matrix materials and additives. In particular, the effects of catalyst phase and acidic solution as an additive have been examined using XRD, N2 isotherm,attrition test, pore size distribution, SEM and TEM.

A study of the Electron Beam Irradiator for Core-loss reduction of Grain-oriented silicon Steel

Min Kim,Jeong-Phil Yoon,Gi-Je Lee,In-Su Cha,Sung-Oh Cho,Byeong-Cheol Lee,Young-Uk Jeong,Jae-Gwon Yoo,Jong-Min Lee 전력전자학회 2001 ICPE(ISPE)논문집 Vol.2001 No.10

A new compact, low-energy electron beam irradiator has been developed. The core-loss of silicon steels can be reduced by magnetic-domain refinement method. The irradiator was developed for the application of core-loss reduction using the method. The beam energy of the irradiator can be varied from 35 to 80 keV and the maximum current is 3 mA. The irradiation area is designed to be 30 × 30 mm2 now and will be upgraded to 30 × 150 mm2 using a scanning magnet and scanning cone. The electron beam generated from 3 mm diameter LaB6 is extracted to the air for the irradiation of the silicon steels in the air. A special irradiation port was developed for this low-energy irradiator. A havar foil with 4.08 μrn thickness were used for the window and a cold air-cooling system keeps the foil structure by removing heat at the window. The irradiator system and its operation characteristics will be discussed.<br/>

Design and Control of Levitation and Guidance Systems for a Semi-High-Speed Maglev Train

Min Kim,Jae-Hoon Jeong,Jaewon Lim,Chang-Hyun Kim,Mooncheol Won 대한전기학회 2017 Journal of Electrical Engineering & Technology Vol.12 No.1

Research on Maglev (Magnetic Levitation) train is currently being conducted in Korea, concerning Urban Transit (110 km/h of maximum speed), semi-high-speed (200 km/h of maximum speed), and high-speed (550 km/h of maximum speed) trains. This paper presents a research study on the levitation and guidance systems for the Korean semi-high-speed maglev train. A levitation electromagnet was designed, and the need for a separate guidance system was analyzed. A guidance electromagnet to control the lateral displacement of the train and ensure its stable operation was then also designed, and its characteristics were analyzed. The dynamic performance of the designed levitation and guidance electromagnets was modeled and analyzed, using a linearized modeling of the system equations of motion. Lastly, a test setup was prepared, including manufactured prototypes of the designed system, and the validity of the design was verified and examined with performance evaluation tests.

Segregation Charging Behavior of Ultra‑Fine Iron Ore Briquette in Sinter Feed Bed: DEM Analysis

Kang‑Min Kim,Jong‑Ho Bae,Jong‑In Park,Jeong‑Whan Han 대한금속·재료학회 2020 METALS AND MATERIALS International Vol.26 No.8

The sinter–briquette complex firing process which is an effective technology for utilization of low grade ultra-fine ore is amethod for charging sinter feed mixed with briquette made of ultra-fine ore. To uniformly fire briquettes using the excessheat from the lower part of the sinter feed bed, they must be segregated in that region. In this study, the particle propertiesand interaction coefficients of real samples were measured and used for a numerical analysis. Furthermore, a discrete elementmethod simulation was used to investigate the characteristics of the sinter feed and briquette charging process, namelyburden distribution and porosity, by varying the shape and mixing ratio of the briquette. The results showed the while theshape of the briquette did not affect the burden distribution and porosity, the porosity at the lower part of the bed proportionallyincreased with the briquette mixing ratio. Furthermore, it was observed that to achieve optimized heat distribution ofthe bed, the proportion of briquette in the charging mixture should be more than 20%.

Genome-wide investigation of a Korean synthetic breed, Woori-Heukdon using the Illumina PorcineSNP60K BeadChip

Yong‑Min Kim,Ha‑Seung Seong,Jung‑Jae Lee,Da‑Hye Son,Jin‑Su Kim,Soo‑Jin Sa,Young‑Sin Kim,Tae‑Jeong Choi,Kyu‑Ho Cho,Joon‑Ki Hong,Jung‑Woo Choi,Eun‑Seok Cho 한국유전학회 2020 Genes & Genomics Vol.42 No.12

Background: Woori-Heukdon (KWH) is a Korean synthetic pig breed generated using Chookjin-Duroc (KCD), Chookjin-Chamdon (KCC), and their crossbreds. Currently, there is a severe lack of studies investigating the Korean breed populations including wild boars (KWB) throughout the genome. Objective: This study was performed to investigate the genetic characteristics of Korean pig populations at the genome-wide level. Methods: Using the SNP dataset derived from genotyped and downloaded datasets using the Illumina PorcineSNP60K BeadChip, we compared the genomes of 532 individuals derived from 23 pig breeds to assess the genetic diversity, inbreeding coefficient, genetic differentiation, and population structure. Results: KWB showed the lowest average expected heterozygosity (HE = 0.1904), while KWH showed the highest genetic diversity (HE = 0.02859) among Korean populations. We verified that the genetic composition of KWH, showing USD of 74.8% and KCC of 25.2% in ADMIXTURE analysis. In population structure analyses, KCC was consistently shown to be separated from other pig populations. In addition, we observed gene flow from Western pigs to a part of Chinese populations. Conclusion: This study showed that Korean native pigs, KCC have genetic differences in comparison with Chinese and Western pigs; despite some historical records and recent genetic studies, we could not find any clear evidence that KCC was significantly influenced by Chinese or Western breeds in this study. We also verified the theoretical genomic composition of KWH at the molecular level in structure analyses. To our knowledge, this is the first genomic study to investigate the genomic characteristics of KWH and KCC.