Microwave Absorption Characteristics of U-Type Ferrite Powders According to Substitution Elements and Its Compositions

Kwang‑Pil Jeong,Su‑Won Yang,Jin‑Hyuk Choi,Jeong‑Gon Kim 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.8

In this study, partially substituted U-type ferrite (Ba4MexCo2-xFe36O60, Me: Mn, Ni, Zn, x=0.5 and 1.0) powders weresynthesized by sol–gel method. The powders were analyzed for phase formation, morphology and magnetic properties byXRD, FE-SEM and VSM respectively. The synthesized ferrite powders were pressed into a series of toroidal shaped samples,in which the weight ratio of parafn to powder was 1:5. The complex scattering parameters were measured by using vectornetwork analyzer in the frequency range of 2–18 GHz and were employed in the calculation of refection loss with variousthicknesses. The minimum refection loss was observed in the substituted nickel sample as−24.4 dB (absorption rate 99.6%)with a thickness of 2.5 mm and the bandwidth was achieved 4.8 GHz (from 7.5 to 12.3 GHz) for refection loss≤ −10 dBin the substituted zinc sample.

OPTIMAL CONTROL PROBLEM IN A TUMOR MODEL WITH IMMUNE SUPPRESSION EFFECTS

Kwang?Su KIM,Il-Hyo JUNG 한국산업응용수학회 2013 한국산업응용수학회 학술대회 논문집 Vol.8 No.1

[Story by Yi Kwang-su] The Unenlightened (Ⅲ)

Yi Kwang-su,Chang Wang-rok(번역자) The Academy of Korean Studies 1970 Korea Journal Vol.10 No.5

베이비붐세대 골프참여자의 건강관심도와 여가몰입 및 가정생활만족의 구조적 관계

설수황(Seol, Su-Hwang),이광용(Lee, Kwang-Yong) 한국사회체육학회 2021 한국사회체육학회지 Vol.- No.83

Purpose: The purpose of this study is to investigate the structural relationship model of health concern, leisure commitment and family life satisfaction of baby-boom generation golf participants. Methods: To achieve the goal of the study, a total 201 surveys collected from golf range in Seoul, Kyuggi, Dae-jeon and Kwang-ju areas were utilized for analysis. Frequency analysis, exploratory factor analysis, reliability analysis, confirmatory factor analysis, correlation analysis and structural equating modeling were conducted using SPSS 18.0 and AMOS 18.0. Results: The results of this study are as follows. 1) Health concerns of baby-boom generation golf participants had a positive effect on leisure commitment (behavioral commitment and cognitive commitment). 2) Health concerns of baby-boom generation golf participants had a positive effect on family life satisfaction. 3) Leisure commitment (behavioral commitment) of baby-boom generation golf participants had a positive effect on family life satisfaction. But leisure commitment (cognitive commitment) of baby-boom generation golf participants did not have an effect on family life satisfaction. 4) The leisure commitment (behavioral commitment) mediated the relationship between health concerns and family life satisfaction in baby-boom generation golf participants. Conclusion: In summary, the findings in this study confirm that the satisfaction of family life increases when immersed in golf.

전국 이부자리 사용에 관한 실태조사 : 1990~2000년의 비교 The Cases in 1990~2000

윤종희,김정숙,성수광 한국의류산업학회 2002 한국의류산업학회지 Vol.4 No.3

The purpose of this study was to improve consumer sleeping life in quality and to suggest producers meet new consumer needs and demands, by examining the nationwide use of bedding, analyzing consumer sleeping life by category and age group, comparing the results with the findings of the nationwide studies by Sung Su-kwang (1992) and Lee Song ja (1995), and identifying the major trend of consumer sleeping life. Results and Discussion The findings of this study were as below: 1. The General Characteristics of the Subjects : Most of the housewives investigated were in their 30s and 40s, with 41.7% and 50.8% respectively. 2. Bedroom : When it comes to bedroom style, 47.8% put beds in their rooms with the Korean under-floor heating system, and 45.4% didn't place beds in their rooms with the same heating system. 3. The Purchase of Bedding : 49.0%, approximately half the homemakers, bought their current bed- clothes at bedding shops, and just 3.2% made them on their own at home. 4. The Use of Bedclothes : In summer, yam (flax, ramie fabric) and a single-layer bed sheet (41.9%) were in use most, followed by a single-layer quilt (34.5%). 5. Bedding Management The most common frequency of bedding disinfection by sunning was once a month (29.4%), followed by once per two weeks (23.9%) and once a week (19.0%) in the order named.

뇌경색후 우울증에서 Homocysteine, Vitamin B12 및 Folate 혈청 농도와 관계

문지수,김광수,유봉구,김종국,김민정 고신대학교의과대학 2008 고신대학교 의과대학 학술지 Vol.23 No.1

Background and purpose : Poststroke depression is common and linked to poor prognosis and higher mortality after stroke. Previous studies suggest that high level of serum homocysteine and low levels of vitamin B12 and folate may cause depression. However previous studies has showed large variation concerning the influencing factors of poststroke depression. The purpose of this study was to evaluated the factor that influencing the poststroke depression including serum levels of homocysteine, vitamin B12 and folate. Methods : Beck depression inventory (BDI) was obtained in 62 patients with cerebral infarction, and the patients were divided into non-depression group (BDI ≤ 13) and depression group (BDI ? 14) according to their BDI scores. Then, we compared serum homocysteine, vitamin B12, folate, age, sex, Barthel index, Scandinavian stroke scale, acute aphasia screening protocol, Korean version of mini-mental state examination and ischemic brain lesion between NDG and DG. And also calculate the correlations between serum homocysteine, vitamin B12 and folate with severity of poststroke depression. Results : The NDG were 41 patients (66.1%) and DG were 21 patients (33.9%). Serum homocysteine, vitamine B12 and folate were not different between the groups, and these levels were not correlated with the severity of BDI. The age, sex, BI, SSS, AASP, K-MMSE and location of ischemic stroke were not different between the groups. Conclusion : Frequency of poststroke depression were high in patients with acute ischemic stroke. In contrast with previous studies, poststroke depression was not influenced by the serum levels of homocysteine, vitamin B12 and folate. And poststroke depression was not influenced by age, sex, physical handicap after stroke, aphasia, cognitive function and location of ischemic stroke.

Practical experiences and requirements on workflow

김광훈,장병옥,백수기 경기대학교교육대학원 1997 경기교육논총 Vol.6 No.-

졸-겔 법으로 증착한 SrBi_(2)Ta_(2)O_(9) 박막의 강유전체 특성

김광수,이남희,이은구 조선대학교 생산기술연구소 2000 生産技術硏究 Vol.22 No.1

Ferroelectric SrB_12Ta_2O_9 (SBT) thin films on Pt/Ti/SiO_2 electrode were fabricated using sol-gel method SBT thin films crystallized from 650℃however, good hysteresis loop can be obtained in the film annealed above 700℃. Pt/T_1O_2/SiO_2 and Pt/SiO_2 electrodes were also used to investigate the Pt electrode dependence of SBT thin films SBT thin films showed random oriented polycrystalline structure and similar morphology regardless of electrodes with quite different surface morphology A 0 2 pm thick SBT film annealed at 750℃ exhibited the remanent polarization(2P_1) of 8μC/㎠ and coercive voltage(V_(c)) of 1V at an applied voltage of 5V

원격 전자맥진 서비스 구현

김수광,신동명,최용락 大田大學校 産業技術硏究所 1998 산업기술연구소 論文集 Vol.9 No.1

There are developing many remote medical systems according to the advanced of communication application technology and network. However, such of development is concentrated in the western medical system, not for oriental medical system. Therefore in this paper, we implement Remote Electronic Pulse Diagnosis Services System for oriental medical examination, diagnosis and treatment using network between remote places. Remote Electronic Pulse Diagnosis Services System is to support Oriental Medicine Services, for instance, Pulse Diagnosis, Inquiring, and Patients Information Management etc. in real time using communication network from remote place. Hence, it provides infrastructure for saving the cost on medical services and supports high level realtime medical services using developed medical network.

pH-LAPS의 제작 및 그 특성

장수원,고광락,강신원 경북대학교 센서기술연구소 1997 센서技術學術大會論文集 Vol.8 No.1

A silicon-based light addressable potentiometric sensor (LAPS) to detect the pH changes was developed. The pH-LAPS structure is Si_(3)N_(4)/SiO_(2)/Si layers, and SiO_(2) layer and Si_(3)N_(4) thin flim which is used as a pH-sensing layer had been grown by dry oxidation and LPCVD method, respectively. We excited photocurrent in the pH-LAPS device by illuminating 10kHz alternative light upon the back of it. The phtocurrent changes according to the potential change, varied by the pH, on the interface between electrolyte and insulator. The fabricated pH-LAPS shows good sensitivity(about 56mV/pH) and lineality in the range from pH 2 to pH 11.