• The Plant Pathology Journal
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• 제39권6호
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• pp.575-583
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• 2023

Fusarium root rot is an increasingly severe problem in soybean cultivation. Although several Fusarium species have been reported to infect soybean roots in Heilongjiang province, their frequency and aggressiveness have not been systematically quantified in the region. This study aimed to investigate the diversity and distribution of Fusarium species that cause soybean root rot in Heilongjiang province over two years. A total of 485 isolates belonging to nine Fusarium species were identified, with F. oxysporum and F. solani being the most prevalent. Pot experiments were conducted to examine the relative aggressiveness of different Fusarium species on soybean roots, revealing that F. oxysporum and F. solani were the most aggressive pathogens, causing the most severe root rot symptoms. The study also assessed the susceptibility of different soybean cultivars to Fusarium root rot caused by F. oxysporum and F. solani. The results indicated that the soybean cultivar DN51 exhibited the most resistance to both pathogens, indicating that it may possess genetic traits that make it less susceptible to Fusarium root rot. These findings provide valuable insights into the diversity and distribution of Fusarium species that cause soybean root rot and could facilitate the development of effective management strategies for this disease.

• 대한치과기공학회지
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• 제13권1호
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• pp.37-51
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• 1991

In order to evaluate health status of dental technicians as an individual and a group, this study was conducted with Todai Health Index Questionaire on randomly sampled 277 persons(236 males and 41 females) from Aug. 20 to Oct. 6, in 1990 obtained Following conclusions were drawn. 1. Age composition of the subjects was 136 males(57.6%) in the age of 20$\sim$29 and 28 females(68.3%) in the age of 20$\sim$24. As for working places, 215 males(91.1%) and 38 females (92.7%) were working for dental laboratories and rest of them were at clinics and hospitals. In working years, male technicians who have been working for 5$\sim$10 years amounted to 80 (33.8%) and 12 females(29.3%) were working for 1$\sim$3years. 2. Responses to psychosomatic subjective symptom complaints rated as the highest in multiple subjective symptom(males : 40.00%, females : 41.98%) and those in physical items and mental irritability(male : 24%, female : 25%) and in mental items came next in order. The rate of complaint in depression was higher in female group than in male group (p<0.05). 3. Resonses to psychosomatic subjective symptom complaints in male group were high in the age of 20$\sim$29 and in the age of 20$\sim$24 in female group. The rates of complaint were higher in multiple subjective symptom, respiratory, eye and skin(p<0.05) and digestives(p<0.01) complaints. 4. Responses to psychosomatic subjective symptom complaints were higher among persons working at dental laboratories than at other working places : dental clinics and hospitals in all the items except for respiratory, depression and aggressiveness. Rates of complaints in eye and skin showed significant difference between working places(p<0.05). 5. Those who are engaged in polishing part tended to complain more about psychosomatic subjective symptoms. 6. The higher the level of education is the more they complained the psychosomatic subjective symptoms both in male and female group. In the difference of complaint respones, male group showed high rates of complaint in depression and female group in aggressiveness(p<0.05). 7. Responses to psychosomatic complaints by the length of working service were moderate in males who were working less than 10 years, and they decreased after 10 years of service. Females showed the highest response rate in the group of 3$\sim$5 years service and the lowest response in the group of 5 years service. Male complained more in aggressiveness and female in respiratory and aggressiveness(p<0.05). 8. Responses to psychosomatic subjective symptom complaint varied according to working hours of a day both in male and female group, showing high complaint rates in multiple subjective symptom, respiratory, eye and skin, mouth and anus, digestive, mental irritability and irregular life in male group(p<0.05).

• 대한교통학회지
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• 제36권1호
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• pp.38-50
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• 2018

자율주행자동차는 속도제어를 통해 교통류의 용량을 증대시키고, 위험 상황 발생 시 차량을 제어함으로써 인적요인으로 인한 사고를 감소시키는 첨단기술로 대두되고 있다. 그러나 자율차와 비자율차가 혼재되어 있는 상황에서 개별자율차의 주행행태가 인근 비자율차에 영향을 미쳐 교통류의 성능이 저하될 것이라는 기존 연구결과들이 꾸준히 발표되고 있다. 이러한 연구 결과는 자율주행환경에서 도로교통시스템의 운영효율성과 안전성을 증대시키기 위한 교통운영관리의 필요성을 나타내며, 본 연구에서는 자율주행기반의 교통운영 관리를 위한 새로운 개념을 제안하고 이를 통한 교통운영관리 방안을 제시하고자 한다. 본 연구에서는 개별자율차의 주행특성을 반영한 자율주행강도라는 새로운 개념을 정의하였으며, 시뮬레이션 분석을 통해 자율주행강도에 따른 교통류의 변화와 적정 자율주행강도를 도출하는 방법론을 제시하였다. 분석 시나리오 설정 시 자율주행강도, 서비스수준, 시스템보급률, 사고유무를 고려하였으며, 운영효율성과 안전성 평가를 위해 주행속도와 상충건수를 평가지표로 활용하였다. 분석결과 시나리오 구성요소와 자율주행강도간의 관계를 파악하였으며, 운영효율성과 안전성 지표간의 패턴을 분석하였다. 통행자유도가 낮은 경우, 자율차의 주행 적극성이 높아질수록 안전성이 저하되는 것으로 나타났으며 소극적인 자율주행강도가 적정함을 확인하였다. 본 연구에서 제안한 자율주행강도는 자율주행시대의 새로운 교통운영관리 기법 및 전략 수립의 기반이 되어 보다 안전하고 효율적인 자율주행환경 구현에 활용될 수 있을 것으로 기대된다.

• 한국환경보건학회지
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• 제8권1호
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• pp.67-80
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• 1982

In order to evaluate the psychosomatic health status of metal manufacturing industries workers and their working environments, the present study was conducted from March 1, 1981 to the end of September 1981. The data was obtained from the samples of metal manufacturing industries in Kyung-In Area and their 1, 162 employees. In addition, the 803 urban residents including students, office clerks, and general publics were sampled as control groups to compare with factory employees in psychosomatic analysis. The basic tool employed in the present study was the Todai Health Index (THI) which modified CMI and was developed by Tokyo University Research Team of Japan. The results of the present study were summarized as follows: 1. Working environments of the factories 1) The data shows that fabrication shop produced the highest noise level ranging from 91 to 96 dB (A) and iron and steel shop had the lowest noise level ranging from 81 to 86 dB (A). 2) Dust concentration was the highest in iron foundry shop ($3.8 mg/m^3$) and the lowest in fabrication shop ($1.2 mg/m^3$). 3) WBGT above threshold limit values (T.L.V.) was noted in steel shop (38$\circ$C) and iron foundry shop (34$\circ$C) 4) The concentration of Sulfur dioxide ($SO_2$)was 30.5ppm at steel shop and 12.0ppm at iron foundry shop. 5) The concentration of carbon monoxide (CO) was 140.0ppm at steel shop and 110.5ppm at iron foundry shop. 6) The atmospheric lead concentration was $0.49 mg/m^3$ at soldering shop. 2. The responses of psychosomatic complaints were much higher in steel shops group than in other manu-facturing group, except the response of aggressiveness. 3. The responses of psychosomatic complaints were much higher in industrial workers than in urban residents, except the responses of depression and aggressiveness (p < 0.01 ). 4. The psychosomatic symptoms which industrial workers and urban residents complained frequently were nervousness. agressiveness and lie scale in order. 5. The responses of psychosomatic complaints by sex were much higher in female group than in male group, except the response of aggressiveness. 6. The responses of psychosomatic complaints by age were that both the female and male group showed an increasing tendency in the all items, except the response of depression as age was increasing. 7. The responses of psychosomatic complaints by the length of services were that both the female and male group showed a tendency of increasing in physical symptoms as work years increased. 8. The responses of psychosomatic complaints were higher in unmarried group in the score of nervousness, aggressiveness, mental irritability and irregular life.

• Journal of Animal Science and Technology
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• 제50권2호
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• pp.273-278
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• 2008

개의 성격형질의 연구는 애견가들이 자신의 애견을 잘 이해할 수 있도록 하고, 나아가 만약 탐지견이나 안내견 같은 인간의 생활에 도움을 주는 우수견 선발에 활용될 수 있다. 본 연구에서 우리는 진도개가 가지는 성격적인 형질을 54두의 진도개를 대상으로 조사하였다. 진도개의 공격성과 사교성에 관련하는 10개의 성격문항이 견주들에 의해 채점되었으며, 점수들을 주성분분석법(Principle Component Analysis)을 통해 분석하였다. 나이, 성별, 거주지(진도군 내 또는 외) 그리고 모색(황색 또는 백색)들이 성격특성에 영향을 미칠 수 있는 변수라 판단되어, 진도개 성격 설문문항들에 대해 주성분분석 결과, 세 개의 인자가 추출되었다. 세 개의 인자는 각각 ‘공격성’, ‘unknown factor’, 그리고 ‘사교성’에 관련하는 문항들을 포함 하고 있었다. 위에서 언급한 네 가지 변수와 공격성 간에 상관성은 관찰되지 않았으나(Ps> 0.05), 모색과 사교성 사이에는 황구가 백구에 비해서 사교성이 높은 경향을 보여주었다 (F1,52 =3.213, p=0.079). 공격성이 다른 변수들과는 상관성이 적은 것으로 보아 이후 진도개의 공격성에 대한 유전학적인 연구가 가능할 것으로 사료된다.

• 한국식물병리학회:학술대회논문집
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• 한국식물병리학회 1999년도 정기총회 및 춘계 학술발표회
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• pp.33.1-33
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• 1999

• 한국윤활학회:학술대회논문집
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• 한국윤활학회 2004년도 학술대회지
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• pp.289-295
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• 2004

The relationship between friction characteristics and iron oxides at the sliding interface was investigated. Three friction materials containing iron, magnetite $(Fe_3O_4)$ or hematite $(Fe_2O_3)$ were manufactured and friction tests were performed on gray cast iron disks to evaluate the friction coefficient as a function of sliding speed $\mu-\nu$. In-situ noise spectrum analyzer was employed to compare noise propensity during friction tests. Results show that the specimens with magnetite are more sensitive to velocity than those with iron or hematite. The specimens containing magnetite and hematite generated noise with different peaks in the spectrum. The difference in the peak frequency seems attributed to the different surface aggressiveness of iron oxides and intermittent changes of real contact area at the sliding interface during sliding. Surface morphology and roughness of the counter disc after the tests are also consistent with the aggressiveness of iron oxides.

• 한국직업건강간호학회지
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• 제26권3호
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• pp.125-132
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• 2017

Purpose: This study was performed to identify the impact of aggressiveness of patients and a sense of coherence on posttraumatic stress in psychiatric nurses. Methods: After collecting data from 162 psychiatric nurses, we carried out a t-test, ANOVA, Pearson's correlation coefficient, and multiple regression using IBM SPSS Statistics 19.0. Results: The mean score of posttraumatic stress was $20.75{\pm}16.59$ points. Verbal aggression, aggressiveness about property, aggression toward oneself, and aggression toward others had a positive correlation with posttraumatic stress, while a sense of coherence had a negative correlation with post-traumatic stress. It was concluded that the significant predictors of posttraumatic stress in psychiatric nurses were aggression toward oneself, a sense of coherence, and aggression toward others, all of which accounted for 38.9% of the variability. Conclusion: The results of this study indicate that the factors influencing posttraumatic stress in psychiatric nurses were aggression toward oneself, aggression toward others, and a sense of coherence. Therefore, education programs should be developed in consideration of the fact that aggressive behavior against the patient himself and against others intensify the posttraumatic stress of the psychiatric nurse, but the integration force mitigates it.

• Journal of the Korean Academy of Child and Adolescent Psychiatry
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• 제20권2호
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• pp.90-96
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• 2009

Objectives: This study examined clinical characteristics associated with bullying in children with attention-deficit/hyperactivity disorder(ADHD). Methods.: Children and their parents were asked to fill out a structured self-report form regarding bullying incidents. To evaluate the characteristics of the children, the results of the ADHD Rating Scale, the Korean version of the Child Behavior Checklist, the ADHD Diagnostic system and the Emotional Recognition Test were used. The agreement of bullying data between each child and their mother and father was measured using Cohen's kappa. The association between victim and perpetrator was analyzed by calculating a contingency coefficient based on chi-square. To compare the characteristics of victimized children and didn't, an independent sample T-test was performed. Results: When children were victims of bullying incidents there was significant agreement between children and parents on the information provided on the self-reports. However, more children reported themselves as a perpetrator of bullying than their parents did. Victimization, that is, the tendency towards being a perpetrator, is associated with the higher level of parental reports of aggressiveness. Conclusion: Victimization of bullying is associated with aggression in children with ADHD. This study suggests that victimized children with ADHD warrant careful evaluation, in particular with regard to the credence placed on parental reports of aggressiveness, and management for aggression.

• 한국콘텐츠학회논문지
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• 제15권12호
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• pp.326-335
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• 2015

본 연구는 생태체계적 접근에 기반을 두고 아동기 우울에 영향을 미치는 다양한 생태체계 변인의 영향력을 검증하기 위하여 실행되었다. 분석 자료는 한국청소년정책연구원의 한국아동 청소년 패널조사 초등학교 1학년 4차년도 자료 2,119사례였다. 유기체변인(아동의 성별, 공격성, 주의집중), 미시체계변인(부모의 방임과 학대, 친구관계, 교사관계), 외체계변인(지역사회인식), 거시체계변인(공동체의식) 순서로 4가지 모델에 대한 위계적 회귀분석을 실시한 결과, 교사관계와 공동체의식을 제외한 모든 생태체계변인들이 아동기 우울에 유의한 영향력을 갖는 것으로 나타났다. 가장 높은 영향력을 갖는 변인은 아동의 공격성이었으며, 다음으로는 부모의 학대, 친구관계와 지역사회인식으로 분석되었다. 이에 아동기 우울에 영향을 미치는 생태체계변인의 영향력을 검증한 본 연구의 결과를 통해 갖는 실천적 함의가 논의되었다.