Floristic study of Jang-do (Isl.) in Korea

Son, Hyun-Deok,Gwon, Soon-Gyo,Jang, Jeong-Won,Sun, Eun-Mi,Kim, Byeol-Ah,Im, Hyoung-Tak The National Institute of Biological Resources 2013 Journal of species research Vol.2 No.2

We investigated the flora of Jang-do (Isl.), an island of the Heuksan archipelago, located in Heuksan-myeon, Shinan-gun, Jeollanam-do and discussed the remarkable plants found there. Thirteen-field trips (total 27 days) were completed from May of 2004 to May of 2013. As a result, we identified the distribution of 423 taxa in Jang-do (Isl.), comprising 104 families, 285 genera, 335 species, 78 varieties and 10 forms. There are a total of 95 taxa of floristic regional indicator plants. The floristic regional indicators are as follows; four taxa of level V such as Impatiens furcillata, four taxa of level IV such as Hosta yingeri, 14 taxa of level III such as Ophioglossum vulgatum, 5 taxa of level II, and 58 taxa of level I. In addition 10 red data plants, 2 vulnerable species (VU) including Calanthe striata for. sieboldii, and 4 least concern species (LC) like Ardisia crenata, 2 not evaluated species (NE) such as Hosta yingeri, were found in the investigated area. An unrecorded species, Fragaria (Rosaceae), was found in a forest of Jang-do (Isl.) for the first time in Korea.

흡연이 치과 외래 이용 및 치과 외래 의료비에 미치는 영향

정선락 ( Sun Rak Jeong ),김영희 ( Young Hee Kim ),장지언 ( Ji Eon Jang ),이원기 ( Won Kee Lee ) 대한예방치과·구강보건학회 2015 大韓口腔保健學會誌 Vol.39 No.4

Objectives: The objectives of this study were to evaluate the effect of smoking on utilization of and expenses in ambulatory dental care. Methods: The subjects of this study were 5,751 men aged over 20 years selected from the Korea Health Panel data collected during 2010-2012. Pack-years of smoking were calculated based on the survey data. Dental utilization was defined as dental outpatient clinic use least once in three years. The expenses in ambulatory dental care were summed to determine total dental health care spending for three years. To detect the effect of smoking, we used multiple logistic regression analysis for dental utilization and multiple linear regression for expenses in ambulatory dental care after changing log. Results: The pack-years had a significant effect on dental utilization and expenses in participants aged 40-59 years. After controlling for income level, bedtime brushing, and the presence of chronic disease, dental care utilization rates in the over 10 to less than 25 pack-year and the over 25 pack-year groups were about 1.4 (OR=1.37, (P =0.007)) and 1.6 times (OR=1.59, (P =0.001)) those in the 0 pack-year group. In comparison with the 0 pack-year group, the over 10 to less than 25 pack-year group spent 50,000 won more over dental expenses, while the corresponding number for the over 25 pack-year group was about 100,000 won. Thus, the ambulatory dental care expenses increased with the packyears of smoking. Conclusions: Smoking significantly influenced the utilization and expense in ambulatory dental care in men aged 40-59 years.

장방형내 저온 단일 수평 원관 주위의 동결현상에 관한 실험적 연구

정현철,윤재원,장원택,전승배,이동석,김병철 朝鮮大學校 機械技術硏究所 2007 機械技術硏究 Vol.10 No.1

An experimental study on water in a rectangular cavity with a horizontal cooling tube was carried out to investigate the flow character and thermal behavior in the system. Each experiment was performed with variation of initial temperature and cooling tube temperature. When the cooling tube temperature was -4℃, the supercooling phenomenon was observed regardless of the initial water temperature. And the case of cooling tube temperature was -6℃ with initial temperature was below 4℃, the supercooling phenomenon was also observedin the large region of the test section. When the cooling tube temperature was -10℃, the local region of supercooling phenomenon was observed during the freezing process. And the higher initial temperature was, the higher supercooling degree and the less difference of the ice thickness between upward and downward was observed. It is shown that by controllingthe supercooling phenomena and the cooling tube temperature, it would lead to an increase efficiency of ice making.

수직 냉각면이 있는 정방형내 성층유체의 열적거동에 관한 실험적 연구

정현철,윤재원,장원택,전승배,이동석,김병철 朝鮮大學校 機械技術硏究所 2007 機械技術硏究 Vol.10 No.1

This study was investigated by experimentals on the thermal behavior of stratified fluids in the square cavity with the vertical cooling surface by variation of initial temperature and cooling surface temperature and concluded as follows: 1. When the cooling surface temperature of the square cavity was -4℃. the supercooling phenomena was occurred every times regardless initial temperature of fluids and when -6℃ freezing was begun with out supercooling phenomena. 2. The higher the initial temperature was, the longer supercooling phenomena duration was, and the longer the supercooling phnomena was, the higher the temperature of the upper fluids was. 3. When the supercooling phenomena of water was occurred, the rate of temperature decrease of silicon oil was higher and when there was no supercooling phenomena, it was almost same the rate of temperature decrease.

열차의 승강대 자동문 고장 분석에 관한 연구

장정태,노원희 대불대학교 2002 大佛大學校大學院 硏究論文集 Vol.- No.1

Korean railroad has been an industrial artery of the country for a long time and has played enormous roles in the transportation of passengers and goods. As a result, this sector has been striving for a continuous improvement in various aspects of the train in order to provide a better service to all passengers. This pattern of improvement can be observed in two broad categories: Electric components and mechanical components. However, in the process of improvement, some problems have occurred due to more complicated system structure, In electric components such as air conditioning units, lighting devices and other subsidiary devices, there occasionally shut off the electric line by the over current relay due to the switches and/or contactors caused by instant failure of the device trouble. The other case is mechanical components such as driving systems and braking devices, there are abnormal condition which are attacked other substances(eg. dust), burst in rubber contact panel, cracked, in welded pipes...etc. Even though, nowadays less, those problems have been minimized significantly in recent year aim to feel more comfortable and softer. So, this paper bases on this motive and analyses into the train examines the current state as well as the main factors causing system fault. It has been reported that train entrance doors and associated rollers are the most fault-prone component. Hence a detailed analysis was undertaken in this particular topic. By it analysis produced valuable insights on how to further improve the current system. It is expected that such preventive maintenance will improment overall quality of the service before faults.

치료용 방사선의 입사각에 따른 광섬유 방사선량계의 체렌코프 빛 측정 및 분석

장경원,조동현,유욱재,신상훈,서정기,이봉수,박병기,문주현 제주대학교 방사선응용과학연구소 2008 방사선응용과학연구소논문집 Vol.22 No.-

In this study, we have measured scintillating light generated in a fiber-optic dosimeter by high energy photon and electron beams using a charge-coupled device. The intensity of Cerenkov lights are also measured and characterized as functions of incident angles and energies of the high energy beams from a clinical linear accelerator. To minimize or remove Cerenkov light, a simple subtraction method using a background optical fiber and wavelength discrimination method using optical filters are investigated. Also, the intensities of Cerenkov light induced by high energy photon and electron beams are compared.

仁川海域 開發에 따른 潮汐變化 및 汚染物質 運送 豫測

鄭信澤,趙烘輦,蔡璋源 圓光大學校 環境建設硏究所 1997 環境建設論文集 Vol.6 No.-

Horizontal 2-D models which includes the wetting-drying treatment technique in the intertidal zone are established for the predietion of tidal changes and contaminant transport due to the development of Incheon coastal zone. Flow model is verified by the measurement data at Jeong-Do, and then the computed value is closely matched to the observed water elevation and velocity of main-flow direction. In the spring tide condition, pollutants transport pattern is simulated for the arbitrary pollutants loads. By the analysis of this numerical simulation results, pollutants are mainly transported by the advection along the narrow deep troughes. Thus, these models can be used as the compatible prediction model for the tidal change and pollutant transport due to the development plan of Incheon coastal zone.

Plyometric Training과 비타민 C 투여가 남고생의 체력, 혈중 젖산, 암모니아 및 젖산탈수소효소에 미치는 영향

장준원,김세종,이현미,서혜림,조현숙,고정림,염종우,예정복,백영호 釜山大學校 附設 體育科學硏究所 2003 體育科學硏究所 論文集 Vol.19 No.-

The purpose of this was to examine the effect of plyometric training and vitamin C ingestion on physical fitness and fatigue substance....

매실나무에 대한 꿀벌의 방화활동

류장발,장정원 대구대학교 생명과학연구소 2003 생명과학연구 Vol.2 No.1

경상북도 경산시에 위치한 대구대학교 수목원에 있는 매실나무에 방화하는 꿀벌의 수를 3월 18일부터 4월 1일까지 조사하였다. 조사한 나무는 16년생 8본과 4년생 4본이었다. 16년생은 주로 꽃을 감상하는 '설중매'라는 품종 4본과 열매를 목적으로 한 품종 4본이었다. 설중매는 다른 품종에 비해 나무의 크기가 작고 꽃의 수도 적었다. 개화기간 중 3월 20일 7시부터 19시까지 꽃을 방화한 벌의 수를 조사한 결과, 기온이 12℃로 오른 11시부터 방화하기 시작하여 16시까지 계속되었다. 설중매를 개화가 다소 빨랐으며(3월 18일 ~ 3월 27일), 다른 품종은 다소 늦었다(3월 20일 ~ 4월 1일). 설중매는 꽃의 수가 훨씬 적음에도 불구하고 방화한 꿀벌의 수는 약 2배 많아, 꿀벌은 설중매를 선호하는 것으로 나타났다. 4년생 매실나무에 방화한 꿀벌이 16년생에 비하여 더 많았는데, 4년생이 양봉장에서 더 가까워서이거나, 16년생은 능선을 넘어 위치한 때문일 것이다. 매실나무의 개화기간에 꿀벌에 대한 경쟁식물로는 회양목, 개암나무, 산수유 등으로 조사되었다. 월동을 끝낸 늙은 꿀벌이 새 꿀벌을 양성하는 이 시기에 개화하는 매실나무는 귀중한 밀원식물인 것으로 확인되었다. Studies on foraging activity of honey bees at flowers of Prunus mume were investigated in order to evaluate the species as honey plants from March 18 to April 1 in 2003 at the arboretum in Daegu University. Cultivar 'Seoljungmae(Cherry in the snow)' bloomed a little earlier and more bees visited this cultivar., though this cultivar. was smaller and had less flowers. Distance from the apiary or(and) the ridge between trees and the apiary seems to discourage bees to visit flowers, as more bees visited smaller trees which located nearer and same direction of the slope with the apiary. Prunus mume was proved as a good honey plant species at early spring for over-wintered old bees to rear new bees.

일부 도시지역 노인들의 우울과 일상생활능력에 관련된 요인

박원규,이태용,정용준,오장균,이동배,조영채 충남대학교 의과대학 의학연구소 2002 충남의대잡지 Vol.29 No.1

This study was performed to provide the basic data and related factors available for the assessment of the degree of ADL and depression among older persons, manifesting their physical and psychological status. The subjects included the old people aged more than 65 years old who reside in urban areas. The interviews were delivered to 693 individuals in Taejon metropolitan city during the two-month period from June to July, 2000, and Zung Self-Rating Depression Scale and IADL developed by Older American Resources and Services of Duke medical college, were employed for the assessment of depression and IADL, respectively. The collected data were statistically processed by SPSSWIN(ver 10.0) and led to the following results. The degree of depression among 635 subjects showed that 26.6% had mild depression, 8.2% moderate and 0.6% severe while 64.6% were normal. In terms of IADL, 6.9% had impossible IADL when not aided by others, 37.0% needed some help, 56.0% possible IADL, and the higher depression scores, the significantly higher IADL scores. Based on general characteristics, depression scores were significantly higher in the female group, the older, the lower educated, the ones without cohabitants, without a spouse, without making expenses of living on their own, and IADL scores were lower, meaning the lower capability for performing daily activities, in the male group, the older, the higher educated, the group without a spouse, without making expenses of living on their own. Based on daily activities and psychological characteristics, depression scores were higher in the group who don't go out, who don't have recreational or friendly gatherings, who aren't satisfied with the lives of the past or present, who have a sense of isolation, and who don't have the will to live, and IADL scores were lower in the group who don't go out, who don't have recreational or friendly gatherings, who aren't satisfied with the lives of the past or present, who have a sense of isolation. and who don't have the will to live. Multiple regression analysis revealed that the explanatory variable having effects on depression symptoms included, with the explanatory power of 57.5%, the confidence in life, the degree of education, the subjective index of health, the sense of isolation, the exercise, the degree of IADL, the gender, the level of satisfaction with life, whether they eat breakfast or not, the concern about life, the smoking, the going out, the presence of spouse or not. The explanatory variables having effects, with the explanatory power of 28.9%, on IADL scores included the degree of depression symptoms, the age, the presence of friends or not, the frequency of outgoing, the level of education, the degree of obesity, the confidence in life, the level of satisfaction with life, the drinking or not. The study results showed that the higher depression scores had a tendency to be associated with the decreased capabilities of performing daily activities, and that the factors related to depression and/or IADL, included the confidence in life, the level of education, and the level of satisfaction with life. However, the more detailed and decisive results on the factors related to depression and IADL of the older persons are considered to require continuing efforts and comparisons among a variety of the older population.