유전자 알고리즘을 이용한 구형 마이크로스트립 안테나 설계

서호진,홍성욱,김흥수 濟州大學校 情報通信硏究所 1998 情報通信硏究所論文集 Vol.1 No.-

This paper presents how to optimize rectangular microstrip antennas using genetic algorithms. Genetic algorithms are global numerical-optimization methods. patterned after the natural processes of genetic recombination and evolution. Rectangular microstrip antennas is analyzed by all parameters of the improved transmission-line model. The algorithms encode each parameter which is the width. length and thickness of the patch, the width of the feed line and the thickness of the dielectric into binary sequences, called a gen. and a set of genes is a chromosome. These chromosome undergo genetic operators to arrive at the final optimal solution for the design of rectangular microstrip antennas. Genetic algorithms determine the parameters of rectangular microstrip antennas to yield the maximum antenna gains. Simulation results obtain antenna gains of 5.3dB. The genetic algorithm proves to be better than general algorithms

제주도 연안 초망 어선의 소음에 관한 연구

박성욱,서익조,오승훈,김병엽,이창헌,서두옥 濟州大學校 海洋硏究所 2002 해양과환경연구소 연구논문집 Vol.26 No.-

제주도 연안에서 이루어지는 초망 어업에서 수중음을 이용하여 멸치 어군을 유효하게 집어하기 위한 기초 자료를 얻기 위하여 어선의 주기관을 공회전시켰을 때의 선상과 어군이 유집되어 투망되는 수심 4m지점과 함께 수심 10m층의 수중 소음을 측정 조사하였다. 이때 사용한 선박의 공회전은 전진시의 800 rpm과 후진시의 1000 rpm으로 그 결과는 다음과 같다. 1. 기관의 회전수 800 rpm에서 선수(B), 갑판(D), 선미(S), 연돌 위(F), 기관실 내(E)의 소음 준위는 각각 90, 93, 106, 107, 101 dB 이었으며, 기관 회전수 1,000 rpm에서의 소음 준위는 각각 93, 95, 110, 109, 103dB이었다. 2. 회전수를 800rpm으로 할 경우 100, 300, 500, 1000, 1500, 2000 Hz에서 선수의 소음 준위는 4m인 경우 각각 92, 95, 102, 97, 94, 92dB 이었으며, 수심 10m인 경우 87, 88, 99, 96, 94, 93 dB이었고, 선체 중앙에서는 4m인 경우 94, 91, 100, 96, 94, 92dB, 10m인 경우 93, 92, 99, 95, 93, 91dB이었다. 선미에서는 4m인 경우 98, 94, 100, 97, 94, 92 dB이었으며 10 m인 경우 92, 93, 99, 96, 93, 92 dB로 나타났다. 3. 후진시 사용하는 회전수 1000 rpm으로 할 경우 100, 300, 500, 1000, 1500, 2000 Hz에서 선수 소음 준위는 4m인 경우 각각 86, 91, 98, 95, 93, 92 dB로 나타났고, 10m인 경우 88, 87, 99, 96, 94, 92 dB로 나타났으며, 선미에서는 4m인 경우 88, 88, 99, 96, 93, 92 dB, 10m인 경우 88, 86, 99, 96, 94, 92 dB로 나타났다. In order to obtain a basic data for alluring a school of fish, anchovy with emitting underwater sound, an experimnet for measuring noise level was carried out on no-load operation of a engine. noise level was measured at the depths of four meters and ten meters and analyzed. Then, the revolution per minute of the ship used at this field experiment was 800 including 1000. The results were followed. 1. On 800 rpm, noise levels on board were 90, 93, 106, 107 and 101 dB in the order of bow, deck, stern, funnel, funnel and engine room. In addition, 93, 95, 110, 109 and 103 dB on 1000 rpm, respectively. 2. on 800 rpm, underwater noise levels of the depth of four meters at the bow were 92, 95, 102, 97, 94 and 92dB at the frequencies of 100, 300, 500, 1000, 1500 and 2000 Hz, respectively and those of the depth of ten meters were 87, 88, 99, 96, 94 and 93 dB. Underwater noise levels of the depth of four meters outside the engine room were 94, 91, 100, 96, 94 and 92 dB at the frequencies of 100, 300, 500, 1000, 1500 and 2000 Hz, respectively and those of the depth of ten meters were 93, 92, 99, 95, 93 and 91 dB. Underwater noise levels of the depth of four meters at the stern were 98, 94, 100, 97, 94 and 92 dB at the frequencies of 100, 300, 500, 1000, 1500, and 2000 Hz, respectively and those of the depth of ten meters were 92, 93, 99, 96, 93 and 92 dB. 3. On 1000 rpm, underwater noise levels of the depth of four meters at the bow were 86, 91, 98, 95, 93 and 92 dB at the frequencies of 100, 300, 500, 1000, 1500 and 2000 Hz, respectively and those of the depth of ten meters were 88, 87, 99, 96, 94 and 92 dB. Underwater noise levels of the depth of four meters at the stern were 88, 88, 99, 96, 93 and 92 dB at the frequencies of 100, 300, 500, 1000, 1500 and 2000 Hz, respectively and those of the depth of ten meters were 88, 86, 99, 96, 94 and 92 dB.

체성분이 폐경 전후 여성의 골밀도에 미치는 여향

배성욱,남철현,신두만,차경미,서인선 慶山大學校 保健福祉硏究所 2002 保健福祉硏究 Vol.7 No.-

Objectives : To evaluate the degree of bone mineral density and prevalence rate of osteoporosis according to age and to search the preventive strategy for osteoporosis, the factors that affect on bone density were studied in Physical Characteristics of pre- and postmenopausal women in korea. Methods : The subjects were 961 premenopausal and 1,167 postmenopausal women who have examined in health promotion center of Yeungnam University Hospital in Daegu city from January, 1999 to January, 2001. The test for bone mineral density, biochemical factors, and body composition were done. Results : 1) The prevalence rates of reduced bone mineral density and osteoporosis in premenopausal women were 23.8% and 1.6%, respectively. However, these values were increased to 46.1% and 28.1% in postmenopausal women. 2) The body weight and height were important predictive factors for bone mineral density. The effects of age, body weight, and height on bone mineral density were 39%. The body weight was correlated statistically significantly with bone mineral density in pre- and postmenopausal women. The higher body mass index (BMI), the greater value of bone mineral density was revealed in pre- and postmenopausal women. 3) The correlation between body composition adjusted for body weight and bone mineral density revealed similar pattern between pre- and postmenopausal women. The height, lean body mass, muscle mass, mineral content, and mineral fraction were positively correlated with bone mineral density, however, body fat mass, percent body fat, waist/hip ratio, and BMI were correlated negatively with bone mineral density. 4) There was no direct correlation between cardiovascular risk factor and bone mineral density in this study, however, further study is needed because cardiovascular disease and osteoporosis have common risk factor and the prevention of osteoporosis can help to prevent cardiovascular disease. 5) In multiple regression analysis among bone mineral density as a dependent variable and independent variables (age, body weight, height, Ca/creatinine ratio, and alkaline phosphatase (ALP)), ALP revealed statistically significant inverse correlation with bone mineral density. Conclusions : These results suggested that to prevent osteoporosis, the systemized program including physical condition for promoting anti-osteoporotic factor have to be developed and apply from the thirties whom have maximal bone mineral density.

급성 충수염에서 의사에 의한 수술지연이 수술후 경과에 미치는 영향

조병욱,박성흠,윤서구,최경우 대한대장항문학회 1998 Annals of Coloproctolgy Vol.14 No.3

초기 변형이 있는 일반 회전체 베어링계의 동조 진동응답해석

홍성욱,박종혁,서용규 金烏工科大學校 1996 論文集 Vol.17 No.-

Rotating machinery often encounter excessive vibration due to various sources. Among others, synchronous excitation such as rotating unbalance and initial deformation is acknowledged as essential source affecting the forced vibration of rotor-bearing systems. In the present paper synchronous response is considered in the presence of initial deformation as well as unbalance. The present paper considers general, flexible rotor bearing system, instead of simple rotors as usually adopted in the literature. The present paper intends to reveal the peculiar effects due to initial deformation in general rotor bearing systems which include rotation speed dependent elements and anisotropic nature. Two numerical examples are provided to illustrate the physics of rotor-bearing systems with initial deformations.

위치결정 스테이지의 정밀위치결정을 위한 가상모드 입력성형기 응용에 관한 연구

장준원,박상원,서용규,홍성욱 한국공작기계학회 2008 한국공작기계학회 춘계학술대회논문집 Vol.2008 No.-

This paper deals with precise positioning of positioning stage by input shaping, Input shaping is well known to be a very effective tool for suppressing the residual vibration of flexible structures. However, the input shaping tends to increase the rise time of the system. This problem often degrades the performance of system, In order to improve this problem, this paper proposes an input shaping method using the virtual mode concept for positioning stage. The virtual-mode input shaper is proved effective through experiments.

소아에서 출혈을 동반한 단일 연소성 용종의 내시경적 절제술

김준기,조상욱,신성하,고영춘,최정영,서강석,강명원,임연근,여향순,김경수 全南大醫大 2001 전남의대학술지 Vol.37 No.3

식도를 포함한 전위장관을 침범한 전이성 악성 흑색종 1예

최정영,김준기,신성하,고영춘,조상욱,서강석,강명원,임연근,여향순,김경수 全南大醫大 2001 전남의대학술지 Vol.37 No.1

중년후기 여성의 폐경관리와 삶의 질에 영향을 미치는 요인 분석

차경미,남철현,배성욱,서인선,김기열 慶山大學校 保健福祉硏究所 2002 保健福祉硏究 Vol.7 No.-

This study was conducted to identify influencing factors to management of menopause and quality of life and also to develope the developing education program of HRT(hormone replacement therapy) for healthy aging women. The hypothetical model explaining health promoting behavior and quality of life was constructed on the basis of Pender's health promotion model, Nho's quality of life model. The empirical data for testing the hypothetical model consisted of 356 late-middle aged(45~64) women who visited from 5th september to 20th september, 1999, in Pohang city. The reliabilities of instruments were adequate(Cronbach's alpha=0.7941, -0.9098). SPSS PC+ program were utilized for descriptive statistics and covariance structure analysis. The summary of research results was as follows: 1) The influential factors to management of menopause showed: The directed factors were the influences of family(β=.29), economical status(β=-.12), experienced symptoms of menopause(β=.24), multidimensional health locus of control(β=.15), subjective health status of compared with to another person(β=-.18). The indirected factors were the influences of family(β=.04), age(β=.05), experience of HRT's information(β=.02), belonging to occupation(β=-.03), stop of menstruation(β=-.02). 2) The influential factors to quality of life showed: The directed factors were the influences of family(β=.39), self efficiency(β=.15), subjective health status(β=-.31). The indirected factors were the influences of family(β=.37), age(β=-.97), belonging to occupation(β=.01), educational status(β=.21), a monthly income(β=.26). In conclusion, the purpose for "Healthy aging" in late-middle aged women is increasing of the quality of life after menopause. All the health providers have to efforts and harder study for developing health maintenances and health aging in late-middle aged women. Consequently, we need many kinds of public health education programs. And farther more, the developing HRT's educational program is very important in late middle-aged women's healthy aging.

마이크로파 용융삽입법을 이용한 생분해성 나노복합체의 제조

하원조,신준식,송승욱,김준호,손세모,박성수 한국환경과학회 2004 한국환경과학회지 Vol.13 No.4

The purpose of this study was to investigate the possibility of application of microwave energy for the fabrication of polymer/clay nanocomposite. APES/Clay nanocomposites were prepared at 130℃ for 30min with various content of clay by melt-intercalation method under classical and microwave heating source. APES/Clay samples were characterized by the means of X-ray diffractometry(XRD), thermal gravimetric analysis(TGA), and rheometric dynamic analysis(RDA). It was found that intercalated or exfoliated state was obtained in the samples according to the condition of organic modification, clay content, and heating source.