• Journal of the Korean Society of Fashion and Beauty
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• v.6 no.2
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• pp.73-79
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• 2008

To study of the rate of damage and morphological change when apply perm and dye according to kinds of curly hair, measured the thickness of hair and divided the samples into groups. Measured the chromaticity and thickness according to kinds of curly hair and chemical treatment with Spectrum colormeter and Micrometer. Measured the tensile strength of hair then calculated the damage rate. After tensile test, took photographs of the section and surface with the electron microscope.

• Proceedings of the KIEE Conference
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• 1993.11a
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• pp.9-12
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• 1993

This study investigated the propriety and the extension of the term of validity about the using watthour meters at present. The subject of study is 1Cent 2W 220V 30(10)A, 1Cent 3W 110V 30(10)A of model III watthour meters. They are the used metes(products in 1984) and the repaired meters(products in 1977) in the end of the period. The investigation is as follows. o Investigation of external appearance o Driving current test o Creeping test o Noise test o Error test o Durability test. Results of the study have been the number of 13.3% exceeded permitting error and the number of 31.3% failed in endurable test of 500 hours. So, the using meters are not suitable to extend the term of validity without the improvement of several characteristics.

• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2014.11a
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• pp.207-208
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• 2014

고순도의 수소를 정제 및 분리하기 위한 팔라듐계 합금 수소분리막은 높은 수소 투과-선택 특성이 요구된다. 그러나 종래의 스퍼터 공정 조건으로 팔라듐계 분리막을 제조하면 주상정 구조에 기인하여 표면에 기공이 형성되게 된다. 본 연구에서는 개선된 스퍼터 시스템에서 고진공, 고온 및 높은 직류 전원 공정조건 하에 치밀하고 균일한 팔라듐/금 수소분리층을 제조하였다. 이와 같은 공정 조건에 의해 종래의 제조 공정 조건 보다 얇은 분리막을 제조하여 공정의 경제성을 향상 시켰으며, 기공이 포함되지 않은 수소분리층을 형성하여 수소 선택 특성이 무한대의 값을 가지는 것으로 관찰되었다.

• Fashion & Textile Research Journal
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• v.3 no.4
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• pp.351-356
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• 2001

The purpose of these experiments is to improve the perm techniques which are fast growing and changing in our life style, for customer satisfaction and to use as basic data for academic purpose through comparing between two methods which are the new permanent wave treatment and the old one. I classified the hair samples to three kinds, which are healthy, normal, and damaged hair. This study is focused on the top part of hair sample which is damaged by strong and long-time sunshine. To get the best result, I use the scanning electron microscope (JSM-5200) as main device of these experiments. The followings are the results of these experiments. First, the new way of permanent wave technique has much more damage on hair than the old one. Second, There are big differences of damaging in this study. The harmed hair has worse result than the healthier hair.

• Proceedings of the Membrane Society of Korea Conference
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• 2003.07a
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• pp.25-28
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• 2003

Low cost composite metallic membranes for the hydrogen separation and production have been prepared by using thin Pd-Ag foils reinforced by metallic (stainless steel and nickel) structures. Especially, “supported membranes” have been obtained by a diffusion welding procedure in which Pd-Ag thin foils have been joined with perforated metals (nickel) and expanded metals (stainless steel): in these membranes the thin palladium foil assures both the high hydrogen permeability and the perm-selectivity while the metallic support provides the mechanical strength. A second studied method of producing "laminated membranes" consists of coating non-noble metal sheets with very thin palladium layers by diffusion welding and cold-rolling. Palladium thin coatings over these metals reduce the activation energy of the hydrogen adsorption process and make them permeable to the hydrogen. In this case, the dense non-noble metal has been used as a support structure of the thin Pd-Ag layers coated over its surfaces: a proper thickness of the metal assures the mechanical strength, the absence of defects (cracks, micro-holes) and the complete hydrogen selectivity of the membrane. membrane.

• Journal of Information Science Theory and Practice
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• v.9 no.1
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• pp.79-89
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• 2021

This study explores Facebook use in Vietnamese academic libraries by analysing libraries' posts on their Facebook pages and library users' interaction with those posts. A total of 260 posts on four academic libraries' Facebook pages were examined using the content analysis method. The findings reveal that Facebook was mainly used to encourage reading and to transmit announcements. Most of the academic libraries published one post a week. The photo was the most frequent media type of libraries' posts and gained a higher level of interaction than other posts. According to the research results, the user engagement was low, and the user interaction with libraries' posts generally was in the form of reaction. The findings can help better understand Facebook use in Vietnamese academic libraries and may assist libraries in creating a plan for using Facebook more effectively.

• Journal of Environmental Health Sciences
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• v.41 no.2
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• pp.61-70
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• 2015

Objectives: The purpose of this research was to examine radon exposure in terms of the relationship between the living environment and indoor radon concentrations among vulnerable households. Methods: Nationwide, 1,129 subjects were selected using personal questionnaires for adequately understanding the living environment, installation of E-PERM radon gas detectors, and investigation of the structure of the housing. Results: The mean concentration of indoor radon for all subjects was $130.2Bq/m^3$ (GM=101.7), and a total of 438 subjects (38.8%) exceeded the recommended standards ($148Bq/m^3$) for public facilities by the Ministry of the Environment. By location, the highest concentrations ($164.3Bq/m^3$, GM=124.1) were seen in North Chungcheong Province. In the case of the Seoul/Gyeonggi Province metropolitan area, they showed $125.6Bq/m^3$ (GM=105.1) and $118.9Bq/m^3$ (GM=96.5), respectively. By type of housing, indoor radon concentrations in single-family housing were higher than in row/multi-family housing (p<0.01). Although indoor radon concentrations raised in accordance with year of construction (p<0.05), the difference between indoor radon concentrations in underground residences was not observed to be statistically significant (p=0.633). Conclusion: More studies are necessary in the future regarding the difference in indoor radon concentrations that may occur due to different of types of indoor construction, building materials, and the amount of building materials.

• Journal of the Society of Cosmetic Scientists of Korea
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• v.44 no.2
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• pp.133-139
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• 2018

Chemically damaged hair is vulnerable to external stimuli in daily life due to the weakened physical properties of the hair strand itself. The purpose of this work was to determine whether chemical conjugation between hair keratin proteins restores tensile strength and thus results inpreventing further deterioration under repeated combing. A model damaged hair tress was produced by a typical perm-process. Then, it was internally crosslinked by the bifunctional crosslinker (3-aminopropyl)triethoxysilane (APTES), via both silane coupling and carbodiimide chemistry. Physical properties, including tensile strength, Young's modulus, and plateau stress, were measured to verify the effect of internal crosslinking, and the existence of crosslinking was verified by Fourier transform infrared (FT-IR) spectroscopy. The degrees of hair breakage and split ends were evaluated by repeated combing-drying tests. Physical properties of chemically damaged hair were restored by internal crosslinking. Successful crosslinking of APTES via both silane coupling and carbodiimide chemistry was verified by FT-IR spectra. Prevention of breakage and split ends after repeated combing with heat was observed. Human hair can be weakened by chemical damage including perm-processing, so restoring such properties is a major issue in the hair care industry. This work shows that internal crosslinking of damaged hair via chemical conjugation would be a potent method to restore the healthy hair.

• Journal of Chest Surgery
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• v.24 no.8
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• pp.792-796
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• 1991

Immature teratoma can be viewed as intermediate between mature teratoma and embryonal carcinoma. Unlike the mature teratoma, elements of the three perm cell layers are incompletely differentiated and not arranged in organoid fashion In some area, more mature forms of these tissues may also be seen, Although this tumor is clearly malignant, they may not display clear-cut cytologic features of malignancy. The clinical prognosis is poor. We have experienced one case of recurrent immature teratoma. In first operation[1987, April], tumor of anterior mediastinum was removed with wedge resection of ant. segment of RUL % med. segment of RML. In 2nd operation[1990, June], recurrent teratoma of right inner thoracic wall was resected with partial 5th rib resection and wedge resection of lat. segment of middle lobe. Two months later, the 3rd operation[1990, September] was done, which was a removal of mass on thoracic wall near sup, segment of RLL and partial rib resection of 3rd, 4th & 5th. In November 1990, last operation[4th operation] was made. It was enucleation of walnut sized tumor located between medial segment of RML, and 4th. intercostal space, well encapsulated with endothoracic fascia and invaded into lung parenchyme, Adjuvant chemotherapy was done after each operation, but radiotherapy[5000 Rad] was done only after 1st operation. There was no evidence of recurrence after last operation. The patient is well-being still now.

• Proceedings of the KIEE Conference
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• 1993.11a
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• pp.32-34
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• 1993

In Korea, the low voltage secondary distribution method comprises lots of the maintainable and conservative problems. So, this paper deals with the plans to solve and decide the unification of the low voltage secondary. That is ; for the unification plan of the low voltage secondary must be previously solved the breaking of netural line in $3{\phi}4W$, $1{\phi}3W$ and enacted the flicker criteria in distribution power system. To decide the low voltage secondary should take into considersion by economics, security and future. The flicker fluctuation in the low voltage secondary 7.4% in responsibility limited place and under 10% in Arc welding. To prevent the netural line in $3{\phi}4W$, $1{\phi}3W$ must be thoroughly constructructed, joined the two sleeves.