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

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.

[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.-

담요의 보온력에 관한 연구

성수광 대구효성 가톨릭대학교 1994 연구논문집 Vol.48 No.1

This study carried out to get some fundamental for data designing lightweight bedding. In this study, the wool blanket, polyester/cotton blended blanket and down quilt were manufactured with a varied materials, strucstural factors such as yarn count, fabric density respectively. And also, the thermal insulation value of the bedding were measured by warmth retaining tester. In addition, this paper examines the influence of varying materials, structural factors and blanket layers on the thermal insulation effect of the bedding. The main results obtained from this study are as follow : 1. The design of lightweight blankets make an attempting with a varying materials and structural factors such as yarn count, fabric densityarn. 2. Almost, the design of lightweight blankets for polyester/cotton blended blanket and down quilt make an attempting without reduction in thermal insulation values. 3. The 6 layers of blanket have less thermal insulation value than the 6 times of blanket for under a layer have. About 27∼32% decrease is observed in thermal in sulation value of blanket for under 6 layer. 4. The thermal insulation value and areal weight of blankets have a positive relation between the thermal insulation value(Y) and areal weight(X) is based on the following equation. wool blanket : Y=1.0850X+0.4188(r=0.9992) P/C blended blanket : Y=0.8845X+0.3034(r=0.9999)

국내 요양 병원 시설에 대한 실태 조사 연구

정광호,조병수 대한건축학회 2003 대한건축학회논문집 Vol.19 No.9

The study is to do the field survey on the architectural environment of domestic long-term hospitals and to find out how to improve the management of whole facilities. The results from the study are as follows. 1) The optimal capacity of one sick room ranges from three to four persons. A sickroom with a bed is preferable to one with a Korean under-floor heating style sickroom because it is easier to take care of patients and to make patient's private space in the bed-style sickroom. The study showed that most of the hospitals don't have enough space for the patients. 2) The field survey on the facilities reveals that some hospitals have sick rooms and public areas not convenient for wheelchair users to use. It is required to improve the condition as soon as possible. The patient is said to need computer or amusement rooms. Also, it is proposed to run a hospice ward in a hospital. 3) The analysis of co-relation on the environment of hospitals revealed that the environmental condition had a meaningful effect on the satisfaction at a sick room and how long they will stay. 4) As the medical fee system for those sanatorium hospitals are not well prepared, long-term hospitalization gives patients financially big burden. So, it is urgent to make a complementary policy. Finally, further study should be done to set up a detailed architectural standard that stipulates that the long-term hospitals should make the environment pleasant.

복합레진 적층계면에서 oxygen inhibition의 영향에 관한 연구

최수미,박재홍,최성철,김광철,최영철 大韓小兒齒科學會 2010 大韓小兒齒科學會誌 Vol.37 No.3

The purpose of this study was to assess the effect on oxygen inhibition layer(OIL) for the interfacial bonding between resin composite layers, including shear bond strength, fracture modes and degree of conversion. The first layer of specimen was filled with Z-250(shade A3) and was cured for 40s. The second layer of specimen was filled with same composite(shade A1) and was cured for 40s. The first layer of specimens for each group were prepared by methods as followings. Control(curing in atmospheric air), Group1(curing against Mylar strip), Group2(scrubbed with a acetonesoaked cotton), Group3(using Tescera light cup), Group4(using Tescera heat cup), Group5(stored in disti1led water for 30days at 37℃), Group6 (using bonding agent). The results were as follows: 1. There was no statistically significant different shear bond strength between control and group 1(p>0.05). 2. Group 2 showed significantly lower shear bond strength than control and group 1(p<0.05). 3. The observation of the fracture surface leads to the evidence that a major difference occurs in the case of control, group1 and group 3 samples which break mainly cohesively while the other groups break in majority adhesively. 4. The results of FTIR showed that the degree of conversion was the highest in group 2 and the lowest in control group(p<0.05). It can be concluded that an OIL is not necessary for bonding with composite resin. But if a reduced critical amount of the unreacted monomer is present, it was detrimental to bonding additional layers of composite. Further study, such as the quantitative analysis of the unreacted monomer are required. 복합레진의 적층계면에서 산소억제층(oxygen inhibition layer:이하 OIL)의 영향을 연구하기 위해, 아크릴릭 몰드(하층)에 복합레진의 shade A3를 충전한 후 표면의 조건을 달리하여 중합하였으며 상층은 shade A1으로 충전하고 중합하였다. 대조군(OIL 존재), 1군(OIL 형성억제), 2군(OIL 형성억제+레진표면의 미반응 모노머 제거), 3군(가압하에 중합), 4군(열중합), 5군(시효처리), 6군(시효처리+본딩제 도포)로 하층의 계면조건을 다르게 하였다. 전단결합강도와 파절양상, 전환률을 분석하여 다음의 결과를 얻었다. 1. 전단결합강도 측정 결과 대조군과 제 1군 사이에 통계학적으로 유의한 차이가 없었다(p>0.05). 2. 제 2군은 대조군과 1군에 비해 낮은 결합강도를 보였다(p<0.05). 3. 제 3군은 가장 높은 결합강도를 보인 반면, 4군은 가장 낮은 결합강도를 보였다. 4. 6군은 5군보다 두 배 정도 높은 결합강도를 보였다. 5. 대조군과 1군 및 3군에서는 주로 응집성 복합레진파절이 일어난 반면 2군, 4군, 5군과 6군에서는 주로 접착성 계면파절이 일어났다. 6. FTIR로 전환률을 측정한 결과 2군에서는 50.55%로 가장 높았고, 대조군에서는 가장 낮았다(p<0.05). 전단결합강도와 전환률의 결과로 보아, OIL은 복합레진 계면의 결합에 필수적인 요인은 아니며, 표층의 미반응 모노머가 결합강도에 영향을 미치는 것으로 보인다. 향후 계면 결합강도에 영향을 미칠 수 있는 미반응 모노머의 정량적인 분석을 통한 추가적인 연구가 필요할 것으로 생각된다.