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Fatigue crack growth characteristics of nitrogen-alloyed type 347 stainless steel under operating conditions of a pressurized water reactor

  • Min, Ki-Deuk;Hong, Seokmin;Kim, Dae-Whan;Lee, Bong-Sang;Kim, Seon-Jin
    • Nuclear Engineering and Technology
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    • v.49 no.4
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    • pp.752-759
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    • 2017
  • The fatigue crack growth behavior of Type 347 (S347) and Type 347N (S347N) stainless steel was evaluated under the operating conditions of a pressurized water reactor (PWR). These two materials showed different fatigue crack growth rates (FCGRs) according to the changes in dissolved oxygen content and frequency. Under the simulated PWR conditions for normal operation, the FCGR of S347N was lower than that of S347 and insensitive to the changes in PWR water conditions. The higher yield strength and better corrosion resistance of the nitrogen-alloyed Type 347 stainless steel might be a main cause of slower FCGR and more stable properties against changes in environmental conditions.

A Study on the Foot Characteristics for the Development of the Last Footwear for Plus Size Women (플러스 사이즈 여성용 신발 라스트 개발을 위한 발 특성 연구)

  • Kim, Namsoon;Do, Wolhee
    • Fashion & Textile Research Journal
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    • v.22 no.3
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    • pp.378-385
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    • 2020
  • The purpose of this study was to present basic data for development of shoe last suitable for women of plus size (BMI 25 kg/㎡ or higher) by type and to analyze the characteristics of each type of foot type. The results of the study are as follows. A comparison of the feet of a plus-size woman and a normal-weight woman showed that the feet of a plussize woman were thicker and wider in the toes, cheeks and feet than those of a normal-weight woman, while the ankle area was thicker. As a result of the cluster analysis by type of foot type of plus-size woman, type 1 was classified into four types, type 1 was 49 (19.5%), type 2 was 43 (17.1%), type 3 was 53 (21.1%), and type 4 was distributed among 106 (42.2%). Type 1 appeared to be a long, low heel, thick foot and wide H-type, and Type 2 appeared to be a D-type with a low heel and a thinner and narrow foot compared to other types, but with wide outer width of the foot. Type 3 showed short feet, low heels, narrow feet, but slanted sides, and Type 4 showed type A with long feet, high heels, thick and wide feet or a combination of toes.

An Experimental Study on the Performance of Plastic Plate Heat Exchanger (플라스틱 판형 열교환기의 성능에 관한 실험적 연구)

  • Yoo Seong Yeon;Chung Min Ho;Kim Ki Hyung;Lee Je Myo
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.17 no.2
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    • pp.117-124
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    • 2005
  • Aluminum plate heat exchanger, rotary wheel heat exchanger, and heat pipe heat exchanger have been used (or ventilation heat recovery in the air-conditioning system. The purpose of this research is to develop high efficiency plastic plate heat exchanger which can substitute aluminum plate heat exchanger. Because thermal conductivity of plastic is quite small compared to that of aluminum, various heat transfer enhancement techniques are applied in the design of plastic plates. Five types of heat exchanger model are designed and manufactured, which are plate type, plate-fin type, turbulent promoter type, corrugate type, and dimple type. Thermal performance and pressure loss of each heat exchangers are measured in various operating conditions, and compared each other. Test results show that heat transfer performance of corrugate type, turbulent promoter type, and dimple type are increases about $43\%$, $14\%$, and $33\%$ at the equivalent fan power compared to those of plate type, respectively. On the other hand, the heat transfer performance of plate-fin type decreases $9\%$ because fins can not play their own role.

The Growth Strategy of Retail Companies: Focusing on New Stores Expansion of E-mart

  • Lee, Gi-Hwang;Kim, Sang-Cheol
    • The Journal of Industrial Distribution & Business
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    • v.8 no.1
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    • pp.15-22
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    • 2017
  • Purpose - Retail companies are turning from one type of retailer to multiple business categories through various reasons, such as taking advantage of existed types of retailers' channel distribution, information and know-how, and entering into new types of retailers. However, there is few research conducted about multiple type of retailers. Research design, data, and methodology - In this research, the references, data and new stores on E-mart will be collected. The dissertation, annual report, statistical data, land-book of E-mart will be also collected to confirm whether E-mart has made any acquisition towards another company. Results - There is a tendency to new stores expansion, store enlargement and prolonging the opening preparation of new stores, based on the core of new stores expansion of E-mart as a general supermarket type of retailers. Based on general supermarket type of retailers, E-mart begins to diversify its retail company's type of retailers. Conclusions - As a general supermarket which is the most important type of retailers, E-mart is expanding into SSM type of retailers to seek new power of growth while slowdown growth is shown in general supermarket type of retailers. The expansion into SSM type of retailers would be a wise option as a retail company, E-mart is able to keep growing in the future.

Studies on HG Type of Heterodera glycines in Korea (국내 콩 씨스트선충의 HG type 분석)

  • Kim, Donggeun;Choi, Insoo;Han, Wonyoung;Ryu, Younghyun;Kim, Myungsik;Bae, Changhwan
    • Research in Plant Disease
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    • v.19 no.1
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    • pp.31-35
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    • 2013
  • Thirteen soybean cyst nematode (SCN) (Heterodera glycines) populations collected in Korea were examined in their HG type by their reproductivity on 7 Plant Introduction indicators for the identification of HG type. Six HG types were identified, HG type 0, 2, 5, 2.5, 1.2.7, and 2.5.7. HG type 2.5 was the most frequent (4 samples, 30.8%), followed by HG type 2.5.7 (3 samples, 23.0%). About 76.9% of SCN populations were reproduced on PI 88788, followed by PI 209332 (61.5%), PI 548316 ('Cloud') (30.8%), and PI 548402 ('Peking') (7.7%). No population could reproduce on PI 90763, PI 437654, thus, they could be used for resistant source for developing SCN resistant soybean in Korea.

A Comparison of the Foot Dimensions and Foot Characteristics of Adult Obese Men using Body Mass Index (체질량지수에 따른 발 치수 비교 및 비만 성인 남성의 발 특성 연구)

  • Namsoon Kim;Wolhee Do
    • Fashion & Textile Research Journal
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    • v.25 no.1
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    • pp.52-61
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    • 2023
  • This study aimed to present data for the development of a shoe which is suitable for plus-size men (BMI 25kg/m2 or higher) and to analyze the characteristics of each type of foot. The results of the study are as follows. To assess foot shape in relation to weight gain, participants were categorized into normal weight, overweight, and obese weight groups, according to their BMI indexes. Those in the normal weight group exhibited a smaller value than the overweight or obese weight group in all items. As a result of the cluster analysis, by type of foot, of the obese men category, men were classified into four BMI index groups: members of the type 1 group had a BMI index of 157 (18.4% of total sample), while for type 2 the figure was 213 (25.0% of sample), for type 3 it was 259 (30.4%), and for type 4 it stood at 224 (26.3% of total sample). Those from the type 1 group had thin ankles with narrow toes and flattened sides. Type 2 group members had thick ankles with well-developed outer feet and thick sides. Those within the type 3 group had medium-thick ankles with narrow feet but wide inner feet. Finally, those in the type 4 group had feet with a slanted side, as well as thick ankles, wide feet, and flat sides. Among these categories, the type 3 group members indicated the highest distribution.

Complete genome sequence of Lachnospiraceae bacterium KGMB03038 (=KCTC 15821) isolated from healthy Korean feces (건강한 한국인 분변으로부터 분리된 Lachnospiraceae bacterium KGMB03038 (=KCTC 15821) 균주의 유전체 염기서열 초안)

  • Kim, Ji-Sun;Kang, Se Won;Han, Kook-Il;Lee, Keun Chul;Eom, Mi Kyung;Suh, Min Kuk;Kim, Han Sol;Lee, Ju Huck;Park, Seung-Hwan;Park, Jam-Eon;Oh, Byeong Seob;Yu, Seung Yeob;Choi, Seung-Hyeon;Ryu, Seoung Woo;Lee, Dong Ho;Yoon, Hyuk;Kim, Byung-Yong;Lee, Je Hee;Lee, Jung-Sook
    • Korean Journal of Microbiology
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    • v.55 no.3
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    • pp.289-292
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    • 2019
  • Lachnospiraceae bacterium KGMB03038 (=KCTC 15821) belonging to the class Clostridia in phylum Firmicutes, was isolated from a stool sample of a healthy Korean. Herein, we report the complete genome sequence of strain KGMB03038 analyzed using the PacBio Sequel platform. The genome comprises of 3,334,474 bp with G + C content of 47.8%, which includes 3,099 predicted protein-coding genes, 12 ribosomal RNAs, 54 transfer RNAs, and 4 ncRNAs. Genome analysis revealed that strain KGMB03038 possesses a number of genes involved in hydrolysis of carbohydrates, including mono-, di-, and oligo-saccharides, and biosynthesis of various amino acids.

Draft genome sequence of Ruminococcus sp. KGMB03662 isolated from healthy Korean human feces (건강한 한국인 분변으로부터 분리된 Ruminococcus sp. KGMB03662 균주의 유전체 염기서열 초안)

  • Han, Kook-Il;Kang, Se Won;Eom, Mi Kyung;Kim, Ji-Sun;Lee, Keun Chul;Suh, Min Kuk;Kim, Han Sol;Park, Seung-Hwan;Lee, Ju Huck;Park, Jam-Eon;Oh, Byeong Seob;Ryu, Seoung Woo;Yu, Seung Yeob;Choi, Seung-Hyeon;Lee, Dong Ho;Yoon, Hyuk;Kim, Byung-Yong;Lee, Je Hee;Lee, Jung-Sook
    • Korean Journal of Microbiology
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    • v.55 no.3
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    • pp.274-277
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    • 2019
  • Ruminococcus sp. KGMB03662 was isolated from fecal samples obtained from a healthy Korean. The whole-genome sequence of Ruminococcus sp. KGMB03662 was analyzed using the PacBio Sequel platform. The genome comprises a 2,707,502 bp chromosome with a G + C content of 43.09%, 2,484 total genes, 2,367 protein-coding gene, 14 rRNA genes, and 53 tRNA genes. In the draft genome, genes involved in the hydrolysis enzyme, fatty acid biosynthesis, fatty acid metabolite, antibiotic biosynthesis, and antibiotic resistance have been identified. Those genes of KGMB03662 may be related to the regulation of human health and disease.

A Clinical Study on the Shape of Normal Liver by Scintiphoto (형광(螢光) "카메라"상(像)에 의(依)한 정상간(正常肝)의 전면형태(前面形態)에 관(關)한 연구(硏究)(예보)(豫報))

  • Chang, Ko-Chang;Park, Jong-In;Kim, Chong-Suhl;Lee, Jin-Oh;Lee, Jang-Kyu
    • The Korean Journal of Nuclear Medicine
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    • v.9 no.1
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    • pp.45-50
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    • 1975
  • A knowledge of the wide ranges in shape of liver is important in the interpretation of hepatic scintigraphy as some variants may be easily confused with pathological abnormalities. In this study, the variations in shape in 250 cases of normal liver obtained by scintiphoto were categorized into 9 types by means of the arbitrary standard for classification. Following were the results; 1) Among 250 normal cases, type 5 was 118(47.2%) with the highest prevalence and type 3 was 2 (0.8%) with the lowest. 2) A high incidence of obesity was noted in type 1, type 4 and type 8. That of ideal weight was noted in type 2, type 5 type 6 and type 9. 3) A high ratio of cardiac impression in scintiphoto was noted in type 4, type 7 and type 8. That of square left lobe was noted in type 2, type 6 and type 9. Finally that of tailed left lobe was in type 4, type 7 and type 8.

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A Study on Culinary Arts Major Students's Type of Subjectivity Recognition through Restaurant Start-up Experience Program -Focused on Pop-up Restaurant- (외식창업교육 체험프로그램을 통한 조리전공 재학생의 주관적 인식유형 연구 -팝업레스토랑을 중심으로-)

  • Kim, Chan-Woo;Shin, Seoung-Hoon
    • The Journal of the Korea Contents Association
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    • v.19 no.6
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    • pp.347-358
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    • 2019
  • This study used Q methodology for analogizing culinary arts major students' subjectivity through their participation of one of restaurant start-up experience program, called pop-up restaurant. The study tried to figure out particular structure of among students' responses and noticed five distinctive types. There were Increase learning effect type(Type 1, N=4), Collaboration of members importance type(Type2, N=8), Marketing PR need type(Type3, N=6), Restaurant business plan type(Type4, N=4), Industry work experience required type(Type5, N=3). The study also revealed that each type contained diverse characteristics figures in their own. The research finding could be used as fundamental source of future similar research but in other research methodology in the format of difference among students or diverse measuring point of time frame.