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Numerical Analysis of Two-Phase Flow in Inclined Channel with Downward- Facing Heated Wall

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Numerical Analysis of Two-Phase Flow in Inclined Channel wit...

Naphthalene emissions from moth repellents or toilet deodorant blocks determined using head-space and small-chamber tests

The Fifth China-Korea Workshop on Nuclear Reactor Thermal Hydraulics

作者： Hae-Kyun Park wan-sik yeon Kwang-Hyun Bang Jungsoo Suh Yong Soo Kim Department of Mechanical and Energy Systems Engineering Korea Maritime University 1 Dongsam-dong Yeongdo-gu Busan 606-791 S.Korea Advanced Power Plant Development Office KHNP Central Research Institute Korea Hydro & Nuclear Power Co.25-1 Jang-dong Yuseong-gu Daejeon 305-343 S.Korea

Wall boiling and bubble population balance equations combined with a two-fluid model are employed to predict boiling two-phase flow in an inclined channel with downward- facing heated wall. For vertical flow, these models have been highlighted by the mechanistic formulation of bubble nucleation on a vertical heated wall by the bubble sliding and lift-off formulations. For downward-facing heated wall in an inclined channel, however, the bubble nucleation and departure behaviors are affected by the large bubbles near the heated wall as vapor accumulates near the upper wall of the inclined channel. In order to observe the boiling behavior on the inclined, downward-facing heated wall, a visualization experiment was carried out with a 100 mm x 100 mm of the cross section, one meter long rectangular channel, inclined by 10 o from the horizontal plane. The size of the heated wall was 50 mm by 750 mm and the heat flux was provided by the Joule heating of the heated wall using the DC electrical current. High speed video images showed the bubble nucleation and growth, sweeping of these bubbles by a large bubble sliding near the wall. For these circumstances of wall boiling and two-phase flow in the inclined channel, the existing wall boiling model encompassing bubble growth and sliding were modified by considering the influence of large bubbles near the heated wall. Using the model developed, boiling two-phase flow in a 3 m long, inclined channel with downward-facing heated wall was analyzed.

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Journal of Environmental Sciences 2008年第8期20卷 1012-1017页

作者： JO wan-Kuen LEE Jong-Hyo LIM Ho-Jin JEONG Woo-sik Department of Environmental Engineering Kyungpook National UniversityDaegu 702-701Korea. School of Food and Life Science Inje University KimhaeKyungsangnarado 621-749Korea

The present study investigated the emissions of naphthalene and other compounds from several different moth repellents(MRs) and one toilet deodorant block(TDB)currently sold in Korea,using a headspace *** emission factors and emission rates of naphthalene were studied using a small-scale environmental ***-type products emitted a higher concentration of the total volatile organic compounds(VOCs)(normalized to the weight of test piece)than ball-type products,which in turn emitted higher con...

关键词： volatile organic compounds(VOCs) chemical composition ball-type gel-type paper-type

Primary rectal mucosa-associated lymphoid tissue lymphoma treated with only endoscopic submucosal dissection:A case report

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World Journal of Clinical Cases 2023年第14期11卷 3362-3368页

作者： wan-sik Lee Myung-Giun Noh Young-Eun Joo Department of Internal Medicine Chonnam National University Medical SchoolHwasun-eup 58128South Korea Department of Pathology Chonnam National University Medical SchoolHwasun-eup 58128South Korea

BACKGROUND Mucosa-associated lymphoid tissue(MALT)lymphoma is a distinct subtype of non-Hodgkin B cell lymphoma that mostly involves the gastrointestinal *** stomach is the most commonly affected site whereas colorectal involvement occurs very *** its rarity,the management and clinical outcome of colorectal MALT lymphoma are not well established *** SUMMARY From the superficial capillary bed in the lower *** ultrasonography showed homogenous hypoechoic lesions in the deep mucosal *** submucosal dissection(ESD)was done for accurate histologic diagnosis and treatment and both the rectal lesions were completely removed en bloc and subsequently diagnosed as primary rectal MALT ***,we report a case of primary rectal MALT lymphoma in a 68-year-old woman that was treated by only ESD,and the 12-month follow-up revealed no tumour *** These results of our case and previous reports suggest that endoscopic resection alone may be a feasible and safe treatment for primary colorectal MALT lymphoma and allows organ preservation.

关键词： Rectum Mucosa-associated lymphoid tissue lymphoma Endoscopic submucosal dissection

Selective recovery of Sn from copper alloy dross and its heat-treatment for synthesis of SnO_2

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Transactions of Nonferrous Metals Society of China 2014年第S1期24卷 157-161页

作者： Jung-Il LEE Jong Bum PARK Tae wan KIM Man-sik KONG Jeong Ho RYU Department of Materials Science and Engineering Korea National University of Transportation Functional Materials Research Team Advanced Materials & Processing Center Institute for Advanced Engineering Yongin Gyunggi 449-863 Korea

Preliminary study on concentration and separation of tin(Sn) from copper alloy dross by selective dissolution method was conducted. The tin in the copper alloy dross did not dissolve in an aqueous nitric acid solution which could allow separation of tin from the copper alloy dross. The tin as H2SnO3(metastannic acid) phase was precipitated in the solution with centrifuging process and transformed to tin dioxide(SnO2) after drying process. The dried sample was heat-treated at low temperature and its phase characteristics, surface morphology and chemical composition were investigated.

关键词： recovery of Sn copper alloy dross selective dissolution SnO2

Thermal stability and mechanical properties of thick thermal barrier coatings with vertical type cracks

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Transactions of Nonferrous Metals Society of China 2014年第S1期24卷 29-35页

作者： Zhe LU Min-sik KIM Sang-Won MYOUNG Je-Hyun LEE yeon-Gil JUNG In-Soo KIM Chang-Yong JO School of Nano & Advanced Materials Engineering Changwon National University High Temperature Materials Research Group Korea Institute of Materials Science

The thermal stability and failure mechanism of thick thermal barrier coatings(TBCs) with and without vertical type cracks were investigated through the cyclic thermal exposure and thermal-shock tests. The TBC systems with thickness of about 2000 μm in the top coat were prepared by an air plasma spray(APS) on the bond coat of about 150 μm in thickness prepared by APS. The adhesive strength values of the as-prepared TBCs with and without vertical type cracks were determined to be 24.7 and 11.0 MPa, respectively, indicating the better interface stability in the TBC with vertical type cracks. The TBC with vertical type cracks shows a better thermal durability than that without vertical type cracks in the thermal cyclic exposure and thermal-shock tests. The hardness values of the as-prepared TBCs with and without vertical type cracks were found to be 6.6 and 5.3 GPa, respectively, which were increased to 9.5 and 5.5 GPa, respectively, after the cyclic thermal exposure tests. These results indicate that the vertical type cracks developed in the top coat are important in improving the lifetime performance of thick TBC in high temperature environment.

关键词： thermal barrier coating air plasma spray vertical type crack thermal durability

Technical issues and new devices of ESD of early gastric cancer

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World Journal of Gastroenterology 2011年第31期17卷 3585-3590页

作者： wan sik Lee Jin Woong Cho Young Dae Kim Kyu Jong Kim Byung Ik Jang Division of Gastroenterology Department of Internal MedicineChonnam University Medical School Division of Gastroenterology and Hepatology Department of Internal MedicinePresbyterian Medical Center Division of Gastroenterology and Hepatology Department of Internal MedicineSchool of MedicineChosun University Division of Gastroenterology Department of Internal MedicineKosin University College of Medicine Division of Gastroenterology Department of Internal MedicineYeungnam University College of Medicine

Endoscopic submucosal dissection(ESD) is a highly refined technique compared to conventional endoscopic mucosal *** enables complete resection of early gastric cancer(EGC) which has no possibility of lymph node *** for ESD of EGC generally entails early gastric cancer confined to the mucosa with well differentiated histology,though there are clinically suitable expanded *** ESD requires specific skill and expertise,endoscopists need to be familiarized with basic methods and the use of special *** essence of the technique is to dissect the submucosal layer with direct vision and maintain thecutting plane above the underlying proper muscle *** there are some differences in the detailed technical aspect,the cardinal method of ESD is now well established and ***,research and development of new ESD devices that render more efficient,safe ESD are still in progress to improve the overall result of ESD on early gastric cancer.

关键词： Endoscopic submucosal dissection Technique Device Early gastric cancer

Combined exercise improves gastrointestinal motility in psychiatric in patients

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World Journal of Clinical Cases 2018年第8期6卷 207-213页

作者： Bong Kil Song yeon Soo Kim Hee Soo Kim Jung-Woo Oh On Lee Joon-sik Kim Health and Exercise Science Laboratory Institute of Sports ScienceSeoul National University Namyangju Hanyang General Hospital

AIM To examine the effect of combined exercise on colonic transit time(CTT) in admitted psychiatric patients. METHODS Over a 6-mo period, consecutive in patients with mental illness were recruited from the Somang Hospital Psychiatry Unit. A combined exercise program that included 60 min per day of exercise 3 d per week for 12 wk was performed. Physical fitness and CTT of the patients were measured twice before and twice after the exercise program. CTT was measured using a multiple marker technique with a radio-opaque marker. Changes in the exercising patients' CTT and weight-,cardiovascular-and fitness-related parameters were statistically *** After the 12-wk combined exercise intervention, decreased intestinal transit time was observed in all CTTs of the exercise group, including the right CTT(exercise: 15.6 ± 15.2 vs 9.2 ± 11.9, control: 13.1 ± 10.4 vs 10.9 ± 18.7), left CTT(exercise: 19.7 ± 23.5 vs 10.4 ± 13.2, control: 19.2 ± 19.0 vs 16.9 ± 19.8), recto-sigmoid CTT(exercise: 14.3 ± 16.7 vs 6.7 ± 7.9, control: 15.0 ± 14.4 vs 19.3 ± 30.3), and total colonic transit time(TCTT)(exercise: 50.2 ± 38.1 vs 27.1 ± 28.0, control: 47.4 ± 34.6 vs 47.3 ± 47.3). After the 12-wk combined exercise period, TCTT was significantly shortened in the exercise group compared with that in the control group. In addition to eating habits, water intake, and fiber intake, the increased physical activity level as a result of the 12-wk combined exercise program reduced the CTT.

关键词： Combined exercise Constipation Colonic transit time Radio-opaque marker Psychiatry unit patient

Improvement of erectile function by Korean red ginseng （Panax ginseng） in a male rat model of metabolic syndrome

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Asian Journal of Andrology 2013年第3期15卷 395-399页

作者： Sung-Dae Kim Young-Joo Kim Jung-sik Huh Sae-Woong Kim Dong-wan Sohn Department of Urology School of Medicine Jeju National University Jeju 690767 Korea Department of Urology College of Medicine The Catholic University of Korea Seoul 150713 Korea

The seriousness of metabolic syndrome is not due to the disease itself but its promotion of other diseases, such as erectile dysfunction and cardiovascular and cerebrovascular diseases. We investigated the effects of Korean red ginseng （KRG, Panax ginseng） extract on erectile function in a rat model of metabolic syndrome. We divided the rats into three groups： control, metabolic syndrome＋normal saline （N/S） and metabolic syndrome ＋ KRG. To determine the occurrence of metabolic syndrome in all groups, body weight and various biochemical parameters （e.g., blood glucose, insulin, cholesterol） were measured, and the intra-abdominal glucose tolerance test was performed. To investigate penile erection, the peak intracavernosal pressure （ICP）, mean arterial pressure （MAP） and Masson＇s trichrome stain were evaluated. Erectile function was also investigated by measuring the cyclic guanosine monophosphate （cGMP） levels of the corpus cavernosum. We found that the various biochemical parameters and body weight were similar in the metabolic syndrome＋KRG group and the control group, although the values were slightly higher. The peak ICP/MAP ratio of the metabolic syndrome＋N/S group was markedly decreased compared to the other groups. The cGMP level of the corpus cavernosum in the metabolic syndrome＋N/S group was significantly lower than that of the other groups. As demonstrated in this model of metabolic syndrome with erectile dysfunction, KRG may improve erectile function.

关键词： erectile dysfunction ginseng metabolic syndrome penis

Domain-engineered BiFeO3 thin-film photoanodes for highly enhanced ferroelectric solar water splitting

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Nano Research 2018年第2期11卷 642-655页

作者： Song, Jaesun Kim, Taemin Ludvic Lee, Jongmin Cho, Sam yeon Cha, Jaeseong Jeong, Sang Yun An, Hyunji Kim, wan sik Jung, Yen-Sook Park, Jiyoon Jung, Gun Young Kim, Dong-Yu Jo, Ji Young Bu, Sang Don Jang, Ho Won Lee, Sanghan School of Materials Science and Engineering Gwangju Institute of Science and Technology (GIST) Gwangju Republic of Korea Department of Materials Science and Engineering Research Institute of Advanced Materials Seoul National University Seoul Republic of Korea Department of Physics Chonbuk National University Jeonju Republic of Korea

In photoelectrochemical （PEC） water splitting, charge separation and collection by the electric field in the photoactive material are the most important factors for improved conversion efficiency. Hence, ferroelectric oxides, in which electrons are the majority carriers, are considered promising photoanode materials because their high built-in potential, provided by their spontaneous polarization, can signifi＇canfly enhance the separation and drift of photogenerated carriers. In this regard, the PEC properties of BiFeO3 thin-film photoanodes with different crystallographic orientations and consequent ferroelectric domain structures are investigated. As the crystallographic orientation changes from （001）pc via （ll0）pc to （lll）p~, the ferroelastic domains in epitaxial BiFeO3 thin films become mono-variant and the spontaneous polarization levels increase to 110 btC/cm2. Consequent136 the photocurrent density at 0 V vs. Ag/AgC1 increases approximately 5.3-fold and the onset potential decreases by 0.180 V in the downward polarization state. It is further demonstrated that ferroelectric switching in the （lll）pc BiFeO3 thin-film photoanode leads to an approximate change of 8,000% in the photocurrent density and a 0.330 V shift in the onset potential. This study strongly suggests that domain-engineered ferroelectric materials can be used as effective charge separation and collection layers for efficient solar water-splitting photoanodes.

关键词： BiFeO3 ferroelectric photoelectrochemical domain orientation pulsed laser deposition