자원 제약을 고려한 제안 프로젝트 포트폴리오 문제의 휴리스틱 기법

조윤재(Cho, Yoon Jae),백인섭(Paek, In Soub),김종출(Kim, Jong Chool),안태호(Ahn, Tae Ho) 한국서비스경영학회 2021 서비스경영학회지 Vol.22 No.1

With regards to the various project to establish information system in the Korean software market, a company intending to win such project considers comprehensively the business detail, expected profits, and probability to win within available resources and comes to determine if to make an offer. Such judgement is one of the most important decision making affecting the overall business management like sales and revenue. Therefore, when the proposed project portfolio is defined as the composition of the project decided to be offered among the ordered projects, Cho, Yoon-Jae(2020) suggests a mathematical model of the problem of maximizing the sum of expected values in constituting the proposed project portfolio and an optimal solution accordingly. This paper assumes the concept of a project mode to be following: 1) the resources are limited, 2) a linear progression of the probability of the orders to be awarded as the duration of each activity increases, 3) the nature of the proposed project is reflected. Unlike previous studies, this research proposes a heuristic technique as a solution to the composition of the proposed project portfolio. The simulation in this study verifies the effectiveness and efficiency of the proposed algorithm as well.

Correlation Between Primary Si and Silicide Refinement Induced by Ultrasonic Treatment of Multicomponent Al–Si Alloy Containing Ti, Zr, V, and P

Jae‑Gil Jung,Young‑Hee Cho,Tae‑Young Ahn,Jae‑Hee Yoon,Sang‑Hwa Lee,Jung‑Moo Lee 대한금속·재료학회 2019 METALS AND MATERIALS International Vol.25 No.5

The correlation between primary Si and silicide refinement induced by ultrasonic treatment (UST) of multicomponent Al–Sialloy containing Ti, Zr, V, and P was investigated. UST significantly refined the primary Si phase owing to cavitation-inducedwetting and deagglomeration of MgAl2O4particles. Lowering the UST finish temperature caused deterioration of the degreeof primary Si refinement, instead leading to silicide refinement. Cavitation-induced silicide nucleation on wetted MgAl2O4consumed the MgAl2O4particles, particularly in the case of primary Si nucleation. Similarly, the formation of an AlP phaseon the silicide phase reduced the nucleation efficiency of the AlP phase. Poisoning of the MgAl2O4and AlP phases by thesilicide phase was responsible for the deterioration in primary Si refinement. Room-temperature tensile strength and hightemperatureelongation were increased by UST and were dependent on the size of primary Si.

서울의 Penicillinase Producing Neisseria gonorrhoeae 발생빈도(1998)

김재홍,김준호,반재용,이정우,황성주,정준규,정성태,강진문,조흔정,홍창의,정혜신,이한승,김이선,이봉길,이종호,선영우,한기덕,윤성필,이성훈,안종성,박석범,문승현,조항래,김형섭,류지호,황재영,박준홍,손상욱 한양대학교 의과대학 2001 한양의대 학술지 Vol.21 No.1

In recent years, gonorrhea has been pandemic and remains one of the most common STDs in the world, especially in developing countries. For the detection of a more effective therapeutic regimen and assessing the prevalence of Penicillinase Producing Neisseria gonorrhoeae(PPNG), we have been trying to study the patients who have visited the Venereal Disease Clinic of Choong-Ku Public Health Center in Seoul since 1980 by menas of the chromogenic cephalosporin method. In 1998, 93 strians of N. genorrhoeae were isolated, among which 60(64.5%) were PPNG. The prevalence of PPNG in Seoul, which had been decreased to 39% in 1996 after a peak of 74.3% in 1993, is increased to 64.5% in 1998.

β-Carotene과 알코올을 섭취한 쥐의 혈액 성분변화의 상관관계

고재웅,조만희,이상한,우기민,염윤기,김창세 순천향의학연구소 2000 Journal of Soonchunhyang Medical Science Vol.6 No.2

The study was carried out to investigate the effects of dietary carotenids and β-carotene on the hematological changes caused by alcohol administration into the rats. The results were analyzed using several statistical methods; SPSS computer program for measuring the mean values and standard deviations, one way ANOVA for the test of significance, Duncan method for post HOC multiple comparison, and Pearson method for measuring the correlation coefficient. The following are the conclusion from those statistical analysis. 1. ALB and TB were shown to have the most significant correlation among the blood compositions f개m the basic dietary groups. 2. BUN and CHO were shown to have the most positive correlation among those from the carrot-fed groups. 3. CA and AG were shown positively correlated, and CHO and IP negatively correlated, respectively among those from the cheese-fed groups. 4. AP was shown positively correlated among those from the alcohol-administrated groups. 5. CHO, CA and BUN were shown positively correlated, and CA was negatively correlated among those from the β-Carotene -fed groups. 6. TB and TP were not affected by the correlations between the blood composition from all the experimental groups.

황토 벽돌벽 주택의 실내공기질에 관한 연구

조성우,이재윤 三陟大學校 産業科學技術硏究所 2003 産業科學技術硏究論文集 Vol.8 No.1

The purpose of this study was to evaluate air quality in the earth brick wall house by measuring. The concentration of CO. CO₂, NO₂, SO₂ was measured using Indoor Air Quality Monitor(BABUC-A) and Radon was measured by Gas Monitor(RAD-7). 1) The concentration of CO and CO₂ were l..65ppm and 427ppm as average value. 2) The average concentration of SO₂ was 0.45ppm in the reference house. 3) The average radon concentration was 0.903 pCi/L and the maximum value was 2.134 pCi/L. The air pollution concentration of the reference house was showed under the criterion of air pollution was published by the Building standards Act in Korea.

충격하중을 받는 해양구조물의 설계에 관한 연구

曺圭楠,尹在俊 홍익대학교 산업기술연구소 1995 産業技術 Vol.5 No.-

The importance of the impact force on the vertical offshore circular structure member in the surf zone due to the breaking wave has been recongnized recently In this paper characteristics of breaking wave forces and the corresponding estimation procedures for them are investigated. For the characterization of the wave forces three parts drag force inertia forces impact force are categorized and identified respectively Among them the impact force in mainly studied the concise form of the force is proposed with the application scheme for the design of offshore circular structure member. The resulting form proposed here for impact force is well coincided with former research results by other people. Except the impact force so called Morison equation can be employed for the common offshore structure design. The drag force and inertia force are represented as conventionally for the profile except the breaking part. In the numerical example for typical sea condition and the member size the proposed procedures for the breaking wave forces calculation are demonstrated. It is found that the impact force is the most dominant one comparing with inertia and drag forces in the surf zone.

파노라마방사선사진에서 석회화가 발견되는 경동맥의 협착 정도

조소양,오원만,윤숙자,윤웅,이재서,Juan M. Palomo,강병철 대한구강악안면방사선학회 2009 Imaging Science in Dentistry Vol.39 No.3

Purpose : This study aimed to investigate the luminal stenosis of the internal carotid artery with calcification detected on panoramic radiographs. Materials and Methods : This study used fifty carotid arteries of 36 dental patients whose panoramic radiograph and computed tomography angiography (CTA) revealed the presence of carotid artery calcification. A neuroradiologist interpreted CTA to determine the degree of stenosis of the internal carotid arteries. The degree of stenosis was stratified in four stages; normal (no stenosis), mild stenosis (1-49%), moderate stenosis (50-69%) and severe stenosis (70-99%). Results : Among the fifty carotid arteries with calcification detected on both panoramic radiography and CTA, 20 carotid arteries (40%) were normal, 29 carotid arteries (18%) had mild stenosis, 1 carotid artery (2%) had moderate stenosis, and there was none with severe stenosis. Conclusion : Sixty percent of the carotid arteries with calcification detected on both panoramic radiography and CTA had internal luminal stenosis, and two percent had moderate stenosis. When carotid atheroma is detected on panoramic radiograph, it is possible that the dental patient has luminal stenosis of the internal carotid artery. (Korean J Oral Maxillofac Radiol 2009; 39 : 157-61)

쇄파대내의 해양구조물 설계인자의 영향분석 연구

曺圭楠,尹載畯 홍익대학교 산업기술연구소 1996 産業技術 Vol.6 No.-

The characteristics of breaking wave force are studied and the corresponding estimation procedure for them are proposed. Among drag force and inertia force and impact force, the impact force is mainly studied with the change of relevant parameters and the example calculation of the force is presented with the application scheme for the design of offshore circular structure member. The impact force is determined based on the main design parameters changes and the relevant wave theories applied. The drag force and inertia force are represented as conventionally for the profile. In the numerical example, for typical sea condition and the member size, the proposed procedures for the breaking wave forces calculation with different wave theories are demonstrated. It is found that the impact force is the most dominant one comparing with inertia and drag forces in the surf zone, and the force is strongly dependent of the applied wave theories. Numerical results show that the impact force value based on the nonlinear wave theory is more conservative in the design of offshore structures.

분리 유채단백의 전기영동 패턴에 미치는 Phytate의 영향

조희경,윤재영,이서래 이화여자대학교 생명과학연구소 1992 생명과학연구논문집 Vol.3 No.-

영양 저해인자로 알려진 phytate를 제거한 분리 유채단백(low-phytate rapeseed protein isolate)을 제조하여 유채단백질과 phytate와의 결합양상에 미치는 pH 및 phytate 첨가량의 영향을 알아보기 위하여 SDS-polyacrylamide gel 전기영동법을 수행 하였다. 가용화된 분리 유채단백은 pH2.0과 pH5.0에서 phytate 첨가량이 증가할수록 가용성 단백질 band의 수가 감소하였으며 pH11.5에서는 band의 변화가 없었다. pH2.0에서 대조군의 18개 band중 7개의 band(105.8,52.3,27.3, 34.8, 36.3, 21.3, 18.4 KDa)가 100mg phytate 첨가시 침전되었으며 150mg 첨가시에는 6개의 band (78.8, 46.5, 19.4, 16.8, 11.7, 8.5KDa)가 더 사라졌다. ph5.0에서는 대조군과 비교하여 15개의 band중 4개의 band( 34.8, 21.3, 18.4, 16.8KDa)만이 phytate 첨가시 침전되었다. 따라서 유채단백을 식품소재로 이용하기 위해서는 phytate 함량을 낮춤으로써 그의 기능성을 향상시킬 수 있을 것이다. This study was undertaken to investigate the effect of pH and phytate level on the solubility of the protein due to binding between phytate and low-phytate rapeseed protein isolate by means of SDS-polyacrylamide gel electrophoresis. Results showed that the number of protein bands decreased by the increasing amount of phytate added to the soluble extreact at pH 2.0 and 5.0 whereas there was no change at pH 11.5. Among 18 bands of rapeseed proteins at pH 2.0 seven bands (105.8, 52.3, 37.3,26.3,21.3,18.4 KDa) were removed by precipitation with 100mg phytate addition and six bands(78.8, 46.5, 19.4, 16.8, 11.7, 8.5KDa) further disappeared by 150mg phytate addition. Among 15 bands at pH 5.0, only four bands disappeared by phytate addition. It is suggested that thefunctionality of rapeseed protein isolate can be improved by lowering the phytate content.

EGDA 기능성 모노마로 희석된 Epoxy Acrylate의 전자빔 경화 및 코팅

조병기,윤경용,Petrov, S.E.,이재민,이정희,한도흥 영남대학교 공업기술연구소 2000 工業技術硏究所論文集 Vol.28 No.1

Electron beam curing of acrylated epoxy resin diluted with mono-functional monomer EGDA has been investigated under circumstances contacted with air and without air. The formulated resin in contact with N2 or covered with film could be cured up to 95% even with low dose of 5kGy and the surface of cured resin became very hard, but cured resin in existence of oxygen and without any additive had a low degree of curing and the surface became sticky due to insufficient curing. Additives such as curing agent P-115 or initiator BPO could increase the degree of curing to more or less one, but these additives could not remove completely surface stickiness. While, at high dose(more than 100kGy), addition of BPO were possible to make the irradiated surface of the resin be non-sticky even in existence of air. Degree of curing of the resin which contained pigment was very high at dose of around 20kGy. Elongation and stress at break on the cured resin with ferric oxide pigment were be higher than with non-ferric oxide pigment. Adhesion and anti-firing of the resin coated on cement block could be excellent.