자갈함량과 질소시비량이 고랭지 배추재배시 침투수에 의한 질소용탈 및 생육에 미치는 영향

박철수,이계준,정영상,주진호,황선웅 한국환경농학회 2005 한국환경농학회지 Vol.24 No.1

고랭지 배추재배지의 성토재로 사용되고 있는 석비레는 모래와 자갈함량이 높아 토양침식과 양분용탈의 주 요인이 되고 있어 본 연구는 자갈함량에 따른 배추수량과 질소의 용탈양상을 구명하고자 pot 시험을 수행하였다. 시험 결과, 배추의 생체수량은 자갈의 함량이 증가할수록 감소하는 경향이었고, 특히 질소시비량 240 kg/ha 구에서는 현저한 수량감소를 보였다. 질소시비량 60 kg/ha 구에서는 자갈함량 30%, 질소시비량 120 kg/ha 구에서는 자갈함량 50%를 변환점으로 하여 배추수량이 급격히 감소하였다. 배추의 생육장해는 질소시비량이 240 kg/ha인 구에서는 대부분 위조현상이 나타났으며 결구 초기인 8월 초순에는 자갈함량이 50% 이상이 되면 질소시비량을 ha당 120 kg만 시용해도 50% 이상이 위조현상을 보였다. 침출수의 암모늄태 질소는 자갈함량과 질소시비량이 많을수록 침출수의 농도가 높아지는 경향을 보였는데, 특히 배추의 고사가 발생한 30% 이상의 자갈함량과 질소시비량 240 kg/ha인 처리구의 농도는 139-339 mg/L이었다. 침출수의 질소용탈량은 자갈함량에 따라 정의 상관관계를 보였고, 자갈함량이 10% 증가될 때마다 pot당 0.14g씩 증가하여 자갈함량이 10%일 때에 비하여 자갈함량이 30%가 되면 약 3.8배 증가하였다. 배추재배 시험 후 토양의 화학성은 NH₄-H 농도와 pH는 처리간에 일정한 경향을 보이지 않았고, NO₃-N 농도는 자갈함량 30%까지는 증가하다가 50%부터는 감소하는 경향을 보였다. 사양토에서 자갈의 함량이 30%일 때 질소비료 240 kg/ha, 자갈함량이 50%일 때 질소비료 120 kg/ha을 시용하면 배추의 생육장해를 가져올 수 있다. 따라서 이러한 토양에 시비를 하게 되면 염류장해와 위조현상을 초래하므로 토양유실이 심한 고랭지는 특수환경을 고려한 시비기준이 설정되어야 할 것으로 판단된다. Continuous monocropping of Chinese cabbage in Gangwon highland increased gravel and sand contents due to surface soil erosion. Nutrient leaching and Chinese cabbage growth were investigated with different treatments of gravel contents and nitrogen application levels by using 0.5 m²Wagner pots. Gravel contents were 0, 10, 30, 50, 70, and 90%(w/w), nitrogen application levels were 60, 120, and 240 kg/ha, and manure compost application rate was 15 ton per hectare, respectively. Wagner pots were filled with loamy sand soil mixed with 5 cm-sized gravels. Fresh weight of Chinese cabbage was decreased as gravel contents in soil increased, and particularly severely decreased at 240 kg-N/ha. Yields of Chinese cabbage were remark-ably decreased at the rate of 60 kg-N/ha with 30% gravel content and 120 kg-N/ha with 50% gravel content. Most of Chinese cabbages were severely wilted by heavy N application at the rate of 240 kg-N/ha in the middle of growth stages regardless of gravel contents, while about 50% of Chinese cabbage showed wilting symptom in the treatment of more than 50% of gravel contents and 120 kg-N/ha. N content in leachate in-creased as gravel content and N application increased. The relationship between gravel content and N con-tents showed linear regression: N in leachate = 0.014(gravel content) -0.039 (r = 0.961). Particularly, NH₄-N contents in leachates with more than 30% gravel content and 240 kg-N/ha ranged from 139~339 mg/L. Chinese cabbage growth in loamy sand soil containing 30%, and 50% gravel contents could be adversely affected by N application at the rate of 240, and 120 kg-N/ha, respectively.

포스트모더니즘 복식 칼라에 나타난 해체주의적 경향

박선영,남윤자 한국의류산업학회 2003 한국의류산업학회지 Vol.5 No.3

The purpose of this study is to investigate how the Post-modernism social cultural pattern has been reflected in collar of costume. In the classes social, collar in costume is the expressive medium of ideology and status symbol such as Passium of ancian Ezypt and Byzantin collar which is examined religion belif. The conspicuous function of collar can be examed as the ruff collar. which is the expressive medium of self-confidence, but the whisk collar and the flat collar means decline the authorized conspicous function. In the cultural pattern of Post-modernism, collar in costume presents the coexistence of double-sides value such as androgyny, dividinism and eclecticism. For example, the tailored collar or shirt collar in women's suit with delicate materials express the self-confidence, energy and intelligence, and the round collar or the draped collar in men's suit with rough material express the sensibility and liberty. In the deconstructivity through breaking the basis form of the collar; callar can be transformed in to sleeve, cape or hat on occasion. In conclusion, the function of collar changes by the cultural pattern and expresses the spirit.

절충형 피복재배방법에서 배토 시기가 연초 식물의 생육에 미치는 영향

박상현,석영선 충북대학교 엽연초연구소 2001 煙草硏究 Vol.18 No.-

This study was conducted to investigate the effect of molding time on the early growth of tobacco plant. The results were summarized as follows. In molding treatment, plant height, stem diameter, largest leaf area, and adventitious root were larger twice than once. In molding time treatments, the growing characters of tobacco in compromised mulching were better early than late but those in pit-covered mulching were not different. At interaction of molding time and time, the early growth of tobacco plant was better early and twice molding treatments than late and once molding treatments.

유산소 리듬 운동프로그램이 노인의 혈압, 심박수 및 생활만족도에 미치는 효과

우선혜,김효정,박영숙 대한보건협회 2001 대한보건연구 Vol.27 No.3

The purpose of this study was to test the effects of aerobic rhythmical exercise program on blood pressure, pulse and the life satisfaction of the elderly. This quai-experimental study was designed as a non-equivalent control group pretest-posttest study. The subjects were 36 subjects(experimental group: 19 subjects, control group: 17 subjects), aged between 65 and 73 years who have normal cognition, sensory function and cerebellum function. Aerobic rhythmical exercise program was developed on the basis of aerobic exercise, Korean tradititional dance and music by the author. The blood pressure, pulse rate and life satisfaction were measured prior to and following the experimental treatment. Data were analyzed with x^2-test, t-test, mean, standard deviation, percentage of change and ANCOVA test using SAS program. The results were as follows. 1. There was no significant difference of systolic blood pressure between experimental and control group following the aerobic rhythmical exercise program(F=1.39, P=0.247). 2. The diastolic blood pressure of the experimental group was significantly lower than that of control group following the aerobic rhythmical exercise program(F=2.96, p<0.1). 3. There was no significant difference of resting heart rate between experimental and control group following the aerobic rhythmical exercise program(F=0.07, P=0.793). 4. The life satisfaction of the experimental group was significantly higher than that of control group following the aerobic rhythmical exercise program(F=9.94, p<0.01). On the basis of the above findings, aerobic rhythmical exercise program is effective in reducing diastolic blood pressure and promoting life satisfaction of the elderly. Thus, this program can be recommended as an effective nursing intervention for the elderly.

수면 부유 방법에 의한 연초 육묘

洪淳達,石泳善,朴孝澤 충북대학교 엽연초연구소 1999 煙草硏究 Vol.17 No.-

Carbonized rice hull, perlite, and vermiculite were mixed and investigated for the probability of tobacco transplant production by means of plug and transfer float system. These seedling bed materials in condition of float system have gaseous phase ranged from 6% to 13% showing a proper growth of tobacco seedling. However compost media mixed with soil, sand, and compost in condition of float system led to the shortage of respiration in root system by very low proportion of gaseous phase skewing a wicked growth of seedling. Absorption of heat by floating water for the daytime increased rhizosphere temperature in condition of float system during the night and low temperature season resulting in better growth of tobacco seedling. Consequently transplant production of tobacco seedling by float system with mixed materials of carbonized rice hull, perlite, and vermiculite was thought to be desirable method for manufacturing production system of transplant considering the effective management of water, nutrients, and temperature of seedling bed materials.

GC/NPD를 이용한 다성분 잔류농약의 동시분석

김우성,이선화,김상엽,정동윤,김재이,이영자,이홍재,정성욱,박흥재 한국환경과학회 2003 한국환경과학회지 Vol.12 No.10

Pesticides were extracted from samples with 70% acetone and methylene chloride in order, and then cleaned up via open-column chromatography apparatus packed with fiorisil, and finally analyzed simultaneously the organophosphorus pesticides using GC/NPD, Ultra-2 and Ultra-1 fused silica capillary columns were used to separate and identify the products. Recovery of most analytes from soybean sample, taken from pesticide residues well, was greater than(80%) for all except(6) analytes. This method can simultaneously determine multiple pesticides with a high degree of accuracy and precision.

Mn-coatings on the micro-pore formed Ti-29Nb-xHf alloys by RF-magnetron sputtering for dental applications

Park, Seon-Yeong,Choe, Han-Cheol Elsevier 2018 APPLIED SURFACE SCIENCE - Vol.432 No.2

<P><B>Abstract</B></P> <P>In this study, Mn-coatings on the micro-pore formed Ti-29Nb-xHf alloys by RF-magnetrons sputtering for dental applications were studied using different experimental techniques. Mn coating films were formed on Ti-29Nb-xHf alloys by a radio frequency magnetron sputtering technique for 0, 1, 3, and 5min at 45W. The microstructure, composition, and phase structure of the coated alloys were examined by optical microscopy, field emission scanning electron microscopy, X-ray diffraction, and energy-dispersive X-ray spectroscopy. The microstructure of Ti-29Nb alloy showed α' phase in the needle-like structure and Ti-29Nb-15Hf alloy showed β phase in the equiaxed structure. As the sputtering time increased, the circular particles of Mn coatings on the Ti-29Nb alloy increased at inside and outside surfaces. As the sputtering time increased, [Mn+Ca/P] ratio of the plasma electrolytic oxidized films in Ti- 29Nb-xHf alloys increased. The corrosion potential (E<SUB>corr</SUB>) of Mn coatings on the Ti-29Nb alloy showed higher than that of Mn coatings on the Ti-29Nb-15Hf alloy. The passive current density (I<SUB>pass</SUB>) of the Mn coating on the Ti-29Nb alloy and Mn coatings on the Ti-29Nb-15Hf alloy was less noble than the non-Mn coated Ti-29Nb and Ti-29Nb-15Hf alloys surface.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Mn-coatings on the micro-pore formed Ti-29Nb-xHf alloys by RF-magnetrons sputtering were studied. </LI> <LI> As the sputtering time increased, the circular particles of Mn on the Ti alloy increased at inside and outside surfaces. </LI> <LI> As the sputtering time increased, [Mn+Ca/P] ratio of the PEO films in Ti- 29Nb-xHf alloys increased. </LI> <LI> E<SUB>corr</SUB> of Mn coatings on the Ti-29Nb alloy showed higher than that of Mn coatings on the Ti-29Nb-15Hf alloy. </LI> <LI> Mn coatings on the Ti-29Nb-15Hf alloy were less noble than the non-coated Ti alloys. </LI> </UL> </P>

Variations of nanotubes on the Ti–Nb–Hf alloys with applied voltages

Park, Seon-Yeong,Choe, Han-Cheol Elsevier S.A. 2016 Thin Solid Films Vol.620 No.-

<P><B>Abstract</B></P> <P>In this study, variations of nanotubes on the Ti–Nb–Hf alloys with applied voltages in dental applications were studied using different experimental techniques. Cone-shaped nanotubes were formed during the anodization of Ti–29Nb–xHf alloys by varying the applied DC voltage from 10 to 30V, and from 30 to 10V. The anodization time was 180min and the electrolyte was 1M H<SUB>3</SUB>PO<SUB>4</SUB> with 0.8wt.% NaF. The morphology changes in anodized Ti–29Nb–xHf alloys were analyzed by optical microscopy, field emission scanning electron microscopy and X-ray diffractometer. The microstructures of the Ti–29Nb–xHf alloys changed from needle-like to an equiaxed structure, and with the increasing of Hf content, the β-phase gradually increased with a concomitant decrease in the α″-phase. Cone-shaped nanotubes were formed when the applied voltage was stepped up and the inversed cone-shape nanotube was formed on stepping down the applied voltage. The diameter, cross-section, length, and shape of the nanotube on the Ti–29Nb–xHf alloys can be controlled both by varying the applied voltage and the Hf content.</P> <P><B>Highlights</B></P> <P> <UL> <LI> In this study, variations of nanotubes on the Ti–Nb–Hf alloys with applied voltages were researched. </LI> <LI> Microstructures of the Ti–29Nb–xHf alloys were changed needle-like to the equiaxed structure with Hf contents. </LI> <LI> Cone-shaped nanotube was formed with increasing applied voltage and inversed cone shape nanotube by decreasing. </LI> <LI> The shape of nanotube on the Ti–29Nb–xHf alloys can be controlled by the voltage and Hf content. </LI> </UL> </P>

Mn-coatings on the micro-pore formed Ti-29Nb-xHf alloys by RF-magnetrons sputtering for dental applications

Seon-Yeong PARK,Kang LEE,Han-Cheol CHOE 한국진공학회 2016 한국진공학회 학술발표회초록집 Vol.2016 No.8

Nanotube Shape Changes on the Ti-29Nb-xHf Alloys by Controlling Applied Voltage

Seon-Yeong Park(박선영),Han-Cheol Choe(최한철) 한국표면공학회 2016 한국표면공학회 학술발표회 초록집 Vol.2016 No.5