팔당호의 생태학적 수질환경의 변화와 미생물 분포

허성남,민경희,유재근,최순영 숙명여자대학교 자연과학연구소 1999 자연과학논문집 Vol.- No.10

팔당호의 생태학적 환경요인의 계절적인 변화를 분석하므로서 이것으로 인한 식물성 플랑크톤의 연관성을 고찰과 함께 오염과정을 파악하여 수질오염의 예방의 기초자료를 얻고자 본 실험을 수행하였다. 1994년 4월부터 1995년 10월까지 계절별로 3개 지점에서 시료를 채취하여 표층부와 저층부의 수질을 분석하였다 용존산소(DO)와 pH는 각각 7.0-11.6 ㎎/ℓ와 6.9-8.9의 범위이었으며 COD와 BOD농도는 각각 1.6-4.8 ㎎/ℓ와 0.8-2.9 ㎎/ℓ이었으며,SS는 1.8-8.6 ㎎/ℓ의 농도차를 보여 주었다. 또한 NH₃-N와 PO₄-P의 농도는 각각 0.161-0.478 ㎎/ℓ와 0.003-0.073 ㎎/ℓ이었다. 표층의 chlorophyll a의 농도는 낮게는 북한강 유입부위인 12.3 ㎎/ℓ로부터 가장 높은 경안천 유입부위 23.8 ㎎/ℓ의 범위를 보여주고 있다. pH,전도도, COD, BOD, SS ,총인, chlorophyll a의 농도는 하계절에 가장 높았으며 이 결과로 미루어 보아 하계절에는 하천에 오염물질이 가장 많이 유입되는 것으로 추정된다. Station별로 조사한 결과 이들의 농도는 경안천 하류인 St. 3가 남한강 하류인 St. 2이나 댐지역의 St. 4보다 높은 결과를 보여 주었으므로 경안천 상류에서 오염원이 가장 많이 유입되는 것으로 추정된다. 아울러 종속영양세균의 분포도 경안천이 다른 지역보다 가장 높게 나타났다. Seasonal variation of water quality was examined in the reservoir, lake Paldang on Han River, the inlet stations from three rivers, North Han River, South Han liver, Kyung-An stream, and the station of dam area of the lake. Water samples were collected bimonthly from surface and bottom layers at four different stations of the lake Paldang from April 1993 to August 1994. With respect to the seasonal variation, pH, conductivity, and concentrations of COD, BOD, SS, total phosphorus, and chlorophyll a were higher in summer compared with those of autumn or other seasons, while concentrations of DO, NH₃-N, and PO₄-P were increased in winter. Concentrations of COD, BOD, chlorophyll a, total nitrogen and phosphorus were the highest at the station of Kyung-An stream rather than those of other three stations. The average concentrations of chlorophyll a surface water were from 12.3 ㎎/ℓ at North Han River to 23.8 ㎎/ℓ at Kyung-An stream. Heterotrophic bacterial distribution showed higher at the station of Kyung-An steam than those of South Han River and the dam station of the lake.

남자 고등학생의 흡연행위군별 성격특성

류미경,박경민,김정남,장은진,이충원,김대현,정철호 대한보건협회 2000 대한보건연구 Vol.26 No.2

The purpose of this study is to investigate the differences of personality characteristics using Minnesota Multiphasic Personality Inventory(MMPI) by current-smokers, ex-smokers and non-smokers among male high school students. The subjects for this study were 448 first and second year male students at general and vocational high school in Taegu and Kyung-Buk Province. Data was collected from August 25 to September 15, 1999. The instrument used in this study was the Validity Scale and the Clinical Scale, the Ego Strength Scale and the Personality Disorder Scale of the MMPI. The data was analysed by using the SPSS Program which included frequency, percentage, x^2-test, ANOVA, scheffe test and stepwise discriminant analysis. The results obtained from this study were as follows. (1) There were significant differences by smoking behavior groups in parents who smoke and who did not smoke(p=.044), intimate-friends who smoke and not(p=.000), academic record(p=.000), satisfaction with school life(p=.020), effect of smoking on health(p=.000), drinking experience(p=.000), drug-use experience(p=.007) and experience into No minors district(p=.000). (2) T-scores of subjects in this study were in the range of 40-60. Psychopathic Deviate Scale(Pd), Paranoid Scale(Pa), Psychasthenia Scale(Pt), Schizophrenia Scale(Sc), Histrionic Personality Disorder Scale(HST) and Anti-social Personality Disorder Scale(ANT) showed higher T-scores than other Clinical and Personality Disorder Scale. (3) The results of post-hoc in Validity Scale and Clinical Scale are as follows: T-scores of current-smokers were higher than that of ex-smokers and non-smokers in Hysteria Scale(Hy), Psychopathic Deviate Scale(Pd), Paranoid Scale(Pa), Psychasthenia Scale(Pt), Schizophrenia Scale(Sc) and Hypomania Scale(Ma); T-scores of non-smokers were higher than that of ex-smokers in Depression Scale(D), and T-scores of non-smokers were higher than that of current-smokers and ex-smokers in Social Introversion Scale(Si). (4) In Ego Strength Scale and Personality Disorder Scale, T-scores of ex-smokers were higher than those of current-smokers. In Histrionic Personality Disorder Scale(HST) and Narcissistic Personality Disorder Scale(NAR), T-scores of current smokers and ex-smokers were higher than those of non-smokers. In Borderline Personality Disorder Scale(BDL), Anti-social Personality Disorder Scale(ANT) and Paranoid Personality Disorder Scale(PAR), T-scores of current-smokers were higher than those of ex-smokers and non-smokers. In Schizotypal Personality Disorder Scale(STY), T-scores of current smokers were higher than that of ex-smokers. In Avoidant Personality Disorder Scale(AVD), T-scores of non-smokers were higher than those of current-smokers and ex-smokers. (5) As a result of stepwise discriminant analysis of the MMPI Scale by smoking behavior, a discrimination rate of the F Scale, Hypomania Scale(Ma), Social Introversion Scale(Si) and Psychopathic Deviate Scale(Pd) out of the Validity Scale and Clinical Scale was 51.1%, and that of Anti-social Personality Disorder Scale(ANT) and Avoidant Personality Disorder Scale(AVD) out of the Personality Disorder Scale was 51.6%, both of the rates were statistically significant. The Above results suggested that smoking by high school students is related with personality characteristics as well as external factors like family, school and their social environment. So school health professionals who are in charge of school health, should operate various smoking prevention or prohibition programs, taking into account personality characteristics. It might have an effect on smoking prevention and the reduction of the smoking rate.

Efficient Unlinkable Secret Handshakes for Anonymous Communications

Eun-Kyung Ryu1,Kee-Young Yoo,Keum-Sook Ha 보안공학연구지원센터(JSE) 2010 보안공학연구논문지 Vol.7 No.6

The technique of secret handshake is used as a fundamental building block for anonymous peer-to-peer communications over untrusted networks. However, the fact that most existing schemes fail to meet unlinkability causes the use of schemes to limit for practical use. In this paper, we provide new constructions for unlinkable secret handshake, allowing arbitrary two communication parties with the same role in either one single group or multiple groups to privately authenticate each other. Compared to previous works, our techniques have much better performance in terms of both computational and communication cost, while they obtain good security results.

정헌 고인석 교수 정년퇴임기념호 / 경희한약개발연구소편 : 신석의 간장독작용과 감초의 해독에 관한 연구

류경수(Kyung Soo Ryu),김명회(Myung Hoe Kim) 경희대학교 동서약학연구소 1986 경희약대 논문집 Vol.14 No.-

효율적으로 방위각 이노베이션을 구하는 다중표적 방위각 추적 알고리즘

유창수,이장식,이균경,Ryu, Chang-Soo,Lee, Jang-Sik,Lee, Kyun-Kyung 대한전자공학회 2001 電子工學會論文誌-SC (System and control) Vol.38 No.6

최근에 Ryu 등은 추정된 신호부공간(signal subspace)으로부터 구한 방위각 이노베이션을 이용하여 다중표적의 방위각을 추적하는 알고리즘을 제안하였다. 이 알고리즘은 데이터를 연관시키면서 동시에 표적의 방위각을 구하기 때문에 기존의 추적 알고리즘과 달리 별도의 데이터연관 기법이 필요 없으며, 구조가 간단하다는 장점을 가지고 있다. 그러나 표적의 개수가 N일 때, 각 표적의 방위각 이노베이션을 구하기 위하여 차원이 (2N+1)${\times}$(2N+1)인 실행렬의 역행렬을 구하는 것이 필요하다. 본 논문에서는 표적의 조향벡터를 신호부공간에 투영할 때, 투영오차가 0이 된다는 사실로부터 방위각 이노베이션을 구하기 위한 새로운 선형 방정식을 제안하였다. 제안한 새로운 선형방정식은 Ryu의 알고리즘에서 사용하는 식과는 달리 한 개의 방위각 이노베이션만을 변수로 사용하기 때문에 역행렬을 구할 필요가 없고 효율적이다. Recently, Ryu et al. proposed a multiple target angle tracking algorithm using the angular innovation extracted from the estimated signal subspace. This algorithm obtains the angles of targets and associates data simultaneously. Therefore, it has a simple structure without data association problem. However it requires the calculation of the inverse of a real matrix with dimension (2N+1)${\times}$(2N+1) to obtain the angular innovations of N targets. In this paper, a new linear equation for angular innovation is proposed using the fact that the projection error is zero when the target steering vector is projected onto the signal subspace. As a result, the proposed algorithm dose not require the matrix inversion and is computationally efficient.

죽음에 관한 주관성 연구

정혜경,김경희,윤은자,류은정,염순교,정연강,권혜진 대한간호학회정신간호학회 1999 정신간호학회지 Vol.8 No.1

The purpose of this study is, by using Q-methodology, to classify the type of attitude for the general public about the death and to understand the specific characters of each type. Q-population was investigated by referring to relevant records and interviewing with the general public and the experts. The final 40 of Q-sample was selected and the data was collected through P-sample, randomly chosen 32 people around Seoul and Kyung-gi area. After analyzing, 4 types were found. Type 1 is aiming for the future life. They believe firmly the future life. They feel certain that eh death means starting for eternal life rather than being afraid of the death or having a despair. Type 2 is valuing reality. They do their best for the reality of life. They take up a positive attitude toward completing their life with responsibilities even at the situation of confronting death have a right to know when they will be dead. They should have enough time to prepare for death. Type 4 is devoting for society. Even though there is only one life, people think that devoting their life for justice is very important. Through the result of this study, people's agreement for nobility and importance of life were found same. It is reconfirmed that instead of being dead suddenly, if it's possible, they want to know the fact of dying to have time to prepare for their death. Also, the fact that everyone has the fear of death is confirmed.

정상체중군과 과다체중군 산업장 중간관리자의 건강증진 행위에 관한 비교연구

김정남(Kim Chung Nam),박경민(Park Kyung Min),류미경(Ryu Mi Kyung),장희정(Jang Hee Jung) 계명대학교 간호과학연구소 2001 계명간호과학 Vol.5 No.1

The purpose of this study was to identify and compare Health Promoting Behavior and its affecting factors between Normal and Over weight industrial middle manager. The subjects were 163 workers employed in factories in Taegu and Kyung-book were convenient sampling data the period for May 22th-26th, 2000 through self report methodby structured questionnaires. Collected data were analyzed by t, x2, Kendal tau, Pearson correlation, Stepwise Multiple Regression. The results of this study were as follows. 1. There were a significant difference in shift pattern(x2=7.89, P=0.005) and career. (x2=12.99, P=0.005) between normal weight and overweight group. 2. The average score of performance in health promoting behavior among overweight group(2.55) was higher than that of normal weight group(2.46), but not significant. 3. The average score of health status in overweight group(3.07) was lower than that of normal weight group(3.21), but not significant. 4. The average score of self-efficacy in overweight group(3.63) was significant lower than that of normal group(3.71). 5. The average score of the perceived barrier of in overweight group(2.44) was significant higher than that of normal group(2.24). 6. Health promoting behaviors in overweight group was significantly correlated with health status(r=.384, P<.05), health Concept(r= 458, P<.01) self-efficacy ( r=352, P< 01), perceived benefit(r=.386, P< .05), perceived barrier(r= -245, P< .05) Health promoting behavior in normal weight group was significantly correlated with health concept( r= .307, P< .050 and perceived benefit. 7. In consideration of variables that have an influence on Health promoting behavior among Normal weight group, health concept and perceived benefit account for 28.8% of health promoting behavior. In overweight group. The perceived benefit account for 13.7% of health promoting behavior. The suggestions are as follows on the basis of the results of this study. 1. It is required to develop health promoting program to improve health promoting behavior. In addition, there are special demands on developing nursing strategies for health promoting behavior of overweight industrial supervisors. 2. It is necessary to support exercise facility in occupational field for improving supervisor's health promoting behavior.

양악전돌증 환자에서 하악 6전치 후방 이동 시 치료 방법에 따른 하악 경조직과 연조직의 변화: 하악 전방분절골절단술과 발치 교정 치료

김영주,김경아,유용재,유경선,유정민,오주영,김수정,김성훈,이백수,Kim, Young-Joo,Kim, Kyung-A,Yu, Yong-Jae,Ryu, Kyung-Sun,Ryu, Jeong-Min,Ohe, Joo-Young,Kim, Su-Jung,Kim, Seoung-Hun,Lee, Baek-Soo 대한악안면성형재건외과학회 2012 Maxillofacial Plastic Reconstructive Surgery Vol.34 No.4

Purpose: The purpose of the study is to evaluate the effectiveness of anterior segmental osteotomy (ASO) in bimaxillary protrusion (BP) patients by comparison between the mandibular soft and hard tissue changes from orthodontic treatment and ASO. Methods: All 44 patients were diagnosed with BP in Kyung-Hee Medical Center. Orthodontic treatment with teeth extractions were underwent by 23 patients (Group A) and 21 patients underwent ASO (Group B). Mandibular soft and hard tissue changes were measured and evaluated, which were based on the vertical and horizontal reference line in lateral cephalometric radiographs. Statistical significance between the changes and correlation between each measurement were analyzed. Results: The amount of B point movement was lesser than that of the lower incisal tip (LIT) retraction, and LIT was tilted lingually in group A. The posterior movement discrepancy between LIT and B point was insignificant, and the inclination of lower incisor was not changed in group B. The soft tissues, including the lower lip, showed a posterior movement and reduction in the depth of mento-labial groove. According to the correlation analysis, the movement of the lower incisor was significantly related to the movement of the lower lip in group A, and the movement of the lower incisor was significantly related to that of the movement of lower lip, B point and Pog in group B. Conclusion: The orthodontic treatment in BP patients results in posterior tilting movement of the lower incisor, but ASO results in the bodily movement of the lower incisor. Consequently, ASO is more effective in BP cases because it ensures the controlled movement of the lower incisors.

배관계의 진동 및 소음특성

류봉조,임경빈,이규섭,송영봉,임경빈 한밭대학교 생산기반기술연구소 2003 생산기반기술연구소 논문집 Vol.3 No.1

This paper deals with the vibration and noise characteristics of three different kinds of pipe structures (PVC pipe, cast-iron pipe and newly developed pp pipe). In order to measure the structure born noise, an impact force generated by dropping a small ball was applied to three different kinds of pipes. It was confirmed that the structure born noise could be reduced by employing a high damping material. Also, transmission loss of a pipe was investigated for various frequency ranges by using a speaker as a sound source.

다섯가지 기초 식품군의 변이원성과 아질산 처리에 의한 변이원성의 변화

류병호,조경자 慶星大學校 1987 부산수산대학 논문집 Vol.8 No.4

다섯가지 기초 식품의 메타놀 추출물에 대한 돌연변이원성에 대하여 Salmonella typhimurium TA 100에 S-9mix의 첨가없이 실험하였다. 다섯가지 기초 식품군 중에서 Ⅰ group의 His?? revertant colony수가 가장 높았고 그 다음이 Ⅳ,Ⅱ, Ⅲ, Ⅴ group의 순이었다. 한편 각 식품군의 메타놀 추출물에 아질산을 처리한 후 돌연변이원성 colony수의 변화는 Ⅱ group의 김치가 S-9mix의 첨가없이 질산염 처리후의 His?? revertant colony수가 가장 높았다. 아질산 처리에 의한 is?? revertant colony수의 하루 섭취량은 아질산을 처리하지않은 식품의 것에 비하여 약 1.6배 높았다. Dairly intake basic five foodstuffs results in the formation of mutagens by Salmonella typhimurium TA 100 without metabolic activation, S-9 mix. Each foodstuffs were dried and then extracted with methanol using a Soxhlet apparatus. I group foodstuffs were appeared large number of His??revertant colonies, and in order of Ⅳ,Ⅱ,Ⅲ and Ⅴgroup. In the other hand, studies were also carried out to test the changes of the number of His??revertant colonies induced by nitrite treatment of each group. Ⅱgroup showed particularly highest increase of His?? revertant colonies after nitrite treatment without S-9 mix. Total daily intake of His?? revertant colonies by nitrite treatment were calculated to be approximately 1.6 times than those by nitrite untreatment. Table 1 Mutagenic activities of methanol extracts from basic foodstuffs toward S. Typhimurium TA 100. ------------------------------------------------------------------------------- Group Foodstuff Does His??revertants/plate (㎎/plate) Untreates Treated with nitrite ------------------------------------------------------------------------------- Ⅰ Mackerel pike 10 128+5 183+8 Gen's egg 10 95+7 132+5 Soybean curd 10 87+10 127+7 soybean paste 10 117+6 177+6 ------------------------------------------------------------------------------- Ⅱ Spinach 10 115+15 165+8 Lettuce 10 117+20 177+11 Pumpkin 10 75+15 110+6 Cuccumber 10 95+27 113+9 Kimchie 10 78+12 118+13 Apple 10 77+17 115+12 ------------------------------------------------------------------------------- Ⅲ Rice 10 67+13 103+7 Barley 10 68+15 102+9 Wheat flour 10 90+11 135+11 Potato 10 89+30 115+12 -------------------------------------------------------------------------------- Ⅳ Milk powder 10 87+9 127+9 Dried small sardine 10 83+7 123+12 -------------------------------------------------------------------------------- Ⅴ Soybean oil 10 65+12 104+3 Toasted seame 10 66+5 107+9 -------------------------------------------------------------------------------- T.P.Ⅱ 0.1㎍ 332+7 MeIQ 0.005㎍ 198+12 control 63+8 95+4 (DMSO) -------------------------------------------------------------------------------- Table 2 Daily intake and mutagenic activities of each groups of foodstuffs. --------------------------------------------------------------------------------Group Foodstuff (A) (B) (A×B) Hig revertants/g Daily intake(g/day) His revertants/day -------------------------------------------------------------------------------- Ⅰ Mackerel pike 222 110 24,420 Hen's egg 143 30 4,290 Soybean curd 26 70 1,820 soybean paste 638 30 19,140 -------------------------------------------------------------------------------- Partial 240 49,140(61.3%) -------------------------------------------------------------------------------- Ⅱ Spinach 35 70 2,450 Lettuce 21 80 1,680 Pumpkin 10 60 600 Cuccumber 44 70 3,080 Kimchie 36 120 4,320 Apple 10 100 1,000 -------------------------------------------------------------------------------- Partial 500 13,130(16.2%) -------------------------------------------------------------------------------- Ⅲ Rice 0 270 0 Barley 0 80 0 Wheat flour 30 150 4,500 Potato 3 150 450 -------------------------------------------------------------------------------- Patial 650 4,950(6.1%) -------------------------------------------------------------------------------- Ⅳ Milk powder 167 15 2,505 dried small 538 20 10,760 sardine -------------------------------------------------------------------------------- Partial 35 13,265(16.4%) -------------------------------------------------------------------------------- Ⅴ Soybean oil 0 27 0 Toasted 0 3 0 seame --------------------------------------------------------------------------------Partial 30 0(0%) --------------------------------------------------------------------------------Total 81,015(100%) -------------------------------------------------------------------------------- Table 3 Change's of the Mutagenic activities of foodstuff groups by nitritement treatment toward S.Typhimurium TA 100 --------------------------------------------------------------------------------Group Foodstuff (c) (C×B) (A×B+C×B) Increased His?? Increased His?? His?? revertants/day revertants/g revertants/day -------------------------------------------------------------------------------- Ⅰ Mackerel pike 237 26,070 50,490 Hen's egg 85 2,550 6,840 Soybean curd 50 3,500 5,320 soybean paste 682 20,460 39,600 --------------------------------------------------------------------------------Partial 52,580 102,250(48.7%) -------------------------------------------------------------------------------- Ⅱ Spinach 185 12,590 15,400 Lettuce 188 15,040 16,720 Pumpkin 49 2,940 3,540 Cuccumber 97 6,790 9,870 Kimchie 166 19,920 24,240 Apple 56 5,600 6,600 -------------------------------------------------------------------------------- Partial 63,240 76,370(36.4%) -------------------------------------------------------------------------------- Ⅲ Rice 3 810 810 Barley 4 320 320 Wheat flour 15 2,250 6,750 Potato 9 1,350 1,800 -------------------------------------------------------------------------------- Patial 4,730 9,680(4.6%) -------------------------------------------------------------------------------- Ⅳ Milk powder 269 5,380 7,885 dried small 67 1,005 11,765 sardine --------------------------------------------------------------------------------Partial 6,385 19,650(9.4%) -------------------------------------------------------------------------------- Ⅴ Soybean oil 68 1,836 1,836 Toasted 25 75 75 seame -------------------------------------------------------------------------------- Partial 1,911 1,911(0.9%) -------------------------------------------------------------------------------- Total 132,302 209,861(100%) --------------------------------------------------------------------------------