• Korean Journal of Health Education and Promotion
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• v.24 no.5
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• pp.55-68
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• 2007

The purpose of this study was to investigate differences in longevity factors for 3 age groups: centenarians, octogenarians, and sexagenarians. There were 389 elderly Korean subjects who participated in this study. This included 109 centenarians who participated in the 1-wave study that examined the longevity factors using the health behaviors and psychological reactions. The study that examined the longevity factors by using odds ratio of the logistic regression analysis. The major findings indicate that female centenarians and octogenarians scored the highest in abstinence from alcoholic drinking than males from these same 2 age groups (OR=9.04, CI=4.04, 20.24). Centenarians scored higher in non-visiting hospitals (OR=11.48, CI=5.56, 23.70) and showed little emotion when watching sad scenes, upon comparison with the younger 2 age groups. Also, centenarians scored higher in laughter (OR=11.59, CI=5.04, 26.63), showing no anxiety (OR=12.49, CI=6.42, 24.32), and displaying indifference towards games, when compared with the younger 2 age groups. The findings imply that Korean centenarian leads to a life of longevity is the result not only of psychological reactions but also of health behaviors. Also, these results support future studies of improvement of longevity factors.

• Journal of Bio-Environment Control
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• v.7 no.3
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• pp.259-267
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• 1998

This study was carried out to investigate the effect of mulching materials on the fruit quality of Miyagawa Early Satsuma Mandarin in the plastic house. The mulching time was 10 days after water irrigation breakage. The mulching materials used, in order of decreasing light reflectivity, were; micro-perforated vinyl sheets, non-woven fabric film, porous black P.E. film and non-mulching(control). Peel coloration by a values in the treatment of the micro-perforated vinyl sheets showed a 6.93 increase over the control group. The a/b values were similar to this trend, but there were no significant difference among the mulching treatment groups. The glucose level of fruit juice was much higher in the mulching treatment groups as compared with that of the control group, but there was no significant difference among the mulching treatments. Fructose content in the treatment of the micro-perforated vinyl sheets a 0.31mg%.m $L^{-1}$ increase over the control group. This group also showed a 1.36%.m $L^{-1}$ increase in sucrose and a similar increase trend in total sugar. The Brix value was 0.9 $^{\circ}$Brix higher in the micro-perforated vinyl sheet group(12.4 $^{\circ}$Brix) than in the control group(11.5 $^{\circ}$Brix) which result in a significant increase with micro-perforated vinyl sheet usage. However, the acidity level did not differ significantly among mulching treatments.

• Journal of the Mineralogical Society of Korea
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• v.28 no.2
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• pp.127-133
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• 2015

Li-bearing muscovite is commonly found along with trioctahedral lepidolite in granitic pegmatites. Structurally, $Li^+$ ions can replace $K^+$ ions in the interlayer (Int) of muscovite or incorporate into vacancies of the dioctahedral sheet (Sub). However, detailed mechanism of the lithium incorporation into muscovite is challenging to investigate using experimental techniques alone. In the current study, density functional theory (DFT) has been applied to examine the crystal structure and energy variation when $Li^+$ resides in the interlayer or the octahedral sheet. Depending on the position of $Li^+$ (i.e., Int vs. Sub), DFT showed significant differences in the mica's structures such as lattice parameters, sheet thickness, interlayer separation, and OH angles with respect to the ab plane. DFT further showed that, in pure muscovite, $Li^+$ has a lower energy when it is located in Int than Sub. By contrast, in the case of $Fe^{2+}$ substitution into the octahedral sheet, $Li^+$ has a lower energy in Sub than in Int. These results imply that $Li^+$ incorporates into the Al octahedral sheets only when the octahedral sheets possess structural charges, suggesting cation substitution in the octahedral sheets plays an important role in the Li incorporation mechanism into muscovite. They can also explain the experimental observation about the positive relationship between $Fe^{2+}$ and $Li^+$ amounts in Li-bearing muscovite.

• Journal of the Economic Geographical Society of Korea
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• v.18 no.1
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• pp.17-44
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• 2015

This paper aims at elucidating the characteristics of immigration path and residential location, and analyzing the factors influencing housing ownership structure and preference of residential location factors of Korean immigrants in Los Angeles. The main results of this study are as follows. Firstly, immigration paths of Korean Immigrants are divided by spatial assimilation type and network of mainstream society oriented type. Secondly, according to the results of binomial logistic regression analysis, Korean town as a current residential location is selected by low-income class, aged migrants group, housing non-owner group and longer migration period group. Thirdly, migrants tend to retain detached housings in residential area of mainstream society while migration period go beyond 10 years and incomes exceed $60,000. Finally, according to ANOVA tests on the preferences of residential location factors. high-income and home owers groups more prefer location factors such as economics, natural environment, housing interior facilities, network of mainstream society.

• Economic and Environmental Geology
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• v.34 no.1
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• pp.119-131
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• 2001

A mean characteristic remanent magnetization was obtained for the first time in Korea from volcanic and pyroclastic sedimentary rocks distributed in Haenam Area, located in southwestern part of the Korean Peninsula. The age of the prevailing rocks in this area belongs mostly to Late Cretaceous, with a few exceptions of Early Cretaceous, mainly based on K/Ar whole rock age dating. Characteristic remanent magnetizations of these have both normal and reverse polarities with antipodal direction, which were interpreted to be the primary remanent magnetizations obtained by the ambient Earth's magnetic field at the time of formation of the concerned rocks. The source magnetic minerals of the remanent magnetization has been identified as magnetite. The mean direction of characteristic remanent magnetization obtained from the Late Cretaceous rocks in this study is Dm/Im=21.4 supper(o)/57.1 supper(o) (${\alpha}_{95}=13.4^{\circ}$, k=350.0). The paleomagnetic pole position calculated from this result for the Late Cretaceous, is $72.5^{\circ}N/199.9^{\circ}E$ (dp/dm= $14.2^{\circ}/19.5^{\circ}E$), which matches well with those of 80 Ma ($76.2^{\circ}N/198.9^{\circ}E$) and 90 Ma ($76.2^{\circ}N/200.1^{\circ}E$) of the Eurasian Continent's APWP (Apparent Polar Wander Path). This result strongly indicates that the studied area, belonging to the Eurasian Continent, have suffered very little geotectonic movement after the Late Cretaceous. The deflection of declination of remanence from Early Cretaceous rocks in the study area may indicate that the micro-block was counterclockwisely rotated with vertical axis between the late of Early Cretaceous and the early of Late Cretaceous.

• Journal of the Mineralogical Society of Korea
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• v.26 no.2
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• pp.87-99
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• 2013

The occurrence, mineralogical characteristics, and origin of the dolomite ores were investigated from major dolomite mines in South Korea. Mineralogical and textural properties of the ores and associated minerals were analyzed using X-ray diffraction, thin section petrography, and scanning electron microscopy. Dolomite ores were light to dark gray in color and mainly composed of dolomite in varying particle size with minor amounts of calcite, quartz and micas. Calcite, quartz, illite, feldspar, kaolin minerals, and chlorite occurred in local veins, dikes and alteration zones. Sepiolite and wollastonite occurred in the altered part of some mine. Asbestos minerals such as chrysotile and tremolite, however, were not identified in the present study. Reddish brown to yellow clay materials were mainly composed of illite, occasionally associated with kaolin minerals and smectite. These clay minerals might be a product of the local hydrothermal alteration related to the dyke intrusion and subsequent weathering. As well indicated in the previous studies, mineral composition, texture, and occurrence of the dolostone beds suggest their formation through the diagenesis of carbonate sediments deposited in the shallow sea during the Precambrian to Paleozoic period.

• Korean Journal of Psychosomatic Medicine
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• v.26 no.2
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• pp.86-93
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• 2018

Objectives : The purpose of this study was to investigate the association between the insulin resistance and depressive mood, suicidal ideation, psychological stress, and quality of life in general Korean population. Methods : We selected 3,613 subjects from the third year's data of 6th Korean National Health and Nutritional Examination Survey. Insulin resistance was evaluated with Homeostatic Model Assessment of Insulin Resistance. Questionnaires on depressive mood, suicidal ideation and psychological stress were conducted. The quality of life was assessed with the EuroQol-5 dimension index. We used correlation and regression analysis for analysis. Results : The risk of depressive mood and suicidal ideation was significantly higher in the insulin resistance group than in the control group. The risk of psychological stress was significantly higher in the male group with insulin resistance. The EuroQol-5 dimension index showed a negative correlation with insulin resistance. After adjusting for age, sex and body mass index, increased risk of suicidal ideation was identified only. Conclusions : We confirmed that insulin resistance is associated to mental health problems related with depression in Korean adults.

• Journal of the Korean Society of Radiology
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• v.81 no.1
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• pp.190-196
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• 2020

Xanthogranulomatous inflammation is a rare inflammatory reaction, characterized by lipid-laden macrophages, known as xanthomas, in histopathologic examination. Aggressive xanthogranulomatous inflammation often manifests as local infiltration but does not affect distant organs unless combined with rare systemic diseases. We report a case of focal xanthogranulomatous pyelonephritis (XGP) associated with severe xanthogranulomatous cholecystitis. Focal XGP was suspected in radiologic examination that showed a cystic lesion with an infiltrative margin, which were surgically resected and confirmed in pathologic examination. To our knowledge, this is the first report of focal xanthogranulomatous pyelonephritis associated with xanthogranulomatous cholecystitis. Moreover, we found peripheral hypointensity around the cystic lesion in the T2-weighted image, probably reflecting hemorrhage and fibrosis of the xanthogranulomatous inflammation.

• Journal of the Korean Society of Radiology
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• v.81 no.2
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• pp.428-435
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• 2020

Herein, we report a case of synchronous bilateral triple negative invasive ductal breast carcinoma in a patient with discrepant pathologic response to neoadjuvant chemotherapy. Right and left breast cancer stages at the initial diagnosis were T1cN0M0 and T4dN3aM0, respectively. The patient was identified as a BRCA1 mutation carrier and treated with four cycles of adriamycin and cyclophosphamide, followed by four cycles of docetaxel. Bilateral breast cancer stages decreased with the first regimen. However, the bilateral breast cancers showed discrepant responses to chemotherapy with docetaxel. The right breast cancer showed a continuous tumor volume reduction while the left breast cancer showed marked progression. Finally, the tumor size was 0.3 cm and 12 cm in the right and left mastectomy specimens, respectively. As bilateral breast cancers of the same subtype may show discrepant responses to neoadjuvant chemotherapy, close monitoring and follow-up imaging are required to avoid delayed surgery.

• Proceedings of the Korea Technical Association of the Pulp and Paper Industry Conference
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• 2001.11a
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• pp.200-200
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• 2001

백판지 면성은 표면 백색도의 변이, 불투명도의 변이, 광택도, 거치름도, 표면 지합, 표면 요철 등 다양한 인자들로 표현되고 있다. 인쇄소에서는 인쇄를 하기 때문에 화선 부에서의 백색도나 불투명도 등은 크게 불만 요소로 작용하지는 않으나 표면 요철의 경우에는 인쇄 후 화선부에서도 나타나기 때문에 고객 불만의 한 요소로 인식되어 진 다. 따라서 본 연구에서는 백판지 면성의 여러 인자 중 표면 요철의 평가에 대해 다루 고자 하였다. 백판지 표면 요철을 시각적으로 나타내기 위한 방법으로 3-Dimensinal topography를 얻을 수 있는 Zygo와 Stylus를 이용, FFT 변환을 통하여 2-dimensional topography를 얻는 방법이 연구되었다. 그러나 기자재 비용, 측정 시간 등의 문제 등으로 표면 요철 을 평가하기 어려운 점이 있다. 본 연구에서는 백판지를 T APIO를 이용하여 O.2mm간격으로 두께를 측정하였고 A verage slope와 Profile length라는 개념을 도입하여 수치 적으로 표면 요철을 정 량화 하였다. Average slope는 1mm 간격으로 이동하였을 때 높이의 편차를 평균하는 값이다. 또 한 Video eam을 이용하여 표면 요철의 형태를 촬영하여 시각적으로 판단할 수 있도록 하였다. 위의 측정 방법으로 국내, 외 12개의 Sample에 대해 Profile length와 Average s slope를 계산하였다. 고객의 주관적 평가를 의사결정 방법 중 하나인 AHP법을 이용하여 주관적인 정성 평가를 수치적으로 정량화할 수 있었으며 실제 측정 결과와 비교, 상관분석을 실시 하 였다. 고객의 평가 결과와 Profile length, average slope의 상관성을 분석한 결과 A Average slope에서 유의성 있는 상관성을 얻을 수 있었고 표면 사진을 비교하였을 때 C Coating 방식 등을 유추할 수 있었다. 이러한 평가 방법을 현장에 적용하였으며 그 결과, 공정 개선 전, 후의 표변을 측정, 개선 유무를 쉽게 판단할 수 있었다.