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가스크로마토그래피/질량분석법에 의한 최적화 유도화 과정을 통한 Atrazine의 새로운 분석방법 개발
박승건,김승진,유영재,이용일 昌原大學校 基礎科學硏究所 2003 基礎科學硏究所論文集 Vol.15 No.-
Pesticides, with their high degrees of toxicity constitute a very impOrtant group target compound in environment samples. The use of many pesticides has been restricted or even banned while several years bemuse of their long residue times, persistence and bio-accumulation. Atrazine was derivatized using a single-step procedure by N,O-bis(trimathylsilyl)-acetamide acetonitrile in various solvent systems such as methanol, ethyl acetate, pyridine, and tetrahy&ofuran(Tl). The variables selected for study were the amount of reagents, the temperature and reaction times. The elelctron impact ionization mass spectra of the resulting derivatives are acquired and properly interpreted. Under the optinaized gas chromatographic conditions employed, an enhanced (3 times) peak height and an improved peak shape without any tailing. The purpose of this study was the development and application of GC-MS method for efficient analysis of atrazine.
안료-수지-용제간의 상호작용이 TiO_2 안료의 분산에 미치는 영향
이근대,홍성수,박진환,안병현 釜慶大學校 2000 釜慶大學校 論文集 Vol.5 No.-
The effect of pigment-resin-solvent interaction on dispersion of pigment has been studied. The solubility parameter of TiO_2 pigment, determined in terms of suspension behavior of pigment in various solvents, was 10.27 (cal/cc)^1/2(δ_d = 8.23, δ_p = 3.45, δ_h = 5.10). The solubility parameter of Acryloid B-44, determined using rheological parameters of resin solution in different solvent, was 9.4 (cal/cc)^1/2. The solvent showing weaker interaction with pigment increased the adsorption of resin on to the pigment, resulting in higher dispersibility and higher storage stability of dispersion.
여러 개의 패치로 이루어진 곡면에서 재매개변수화를 통한 공구경로 생성
이성근,권성환,양승환 韓國工作機械學會 2000 한국생산제조학회지 Vol.9 No.5
Recently, according to the various taste of consumers, the design of a product is changed variously and complicatedly. The complicated product is not usually constructed with one patch but multi-patch. By the way, in machining, higher pre-cision and the reduction of leading and machining time is required. But, for the multi-patch sculptured surface, the amount of machining data becomes large. This means the increase of leading and machining time. In this study, the tool path generation method with reparameterization is proposed for multi-patch sculptured surface and variable step size using NURBS is used to satisfy the precision and to reduce leading and machining time.
손승건,김성룡 군산대학교 체육과학연구소 1999 體育科學硏究所 論文集 Vol.1 No.-
As human life gets longer, the average span of life in korea would come to eighty from the mid-21th centry on. Now, well make into investigation of the quality of their lives. 1. The problem of exercise development in the age. 2. The evaluation of health and its problem. 3. The consititution of the concept in quality of life. 4. The bacground of improvement in quality of life. 5. The method of understanding quality of life and historical background in medical care. 6. The role of body activity and the development of its sutible program.
김건희,노승옥 德成女子大學校 1996 德成女大論文集 Vol.27 No.-
To understand the relationship between dietary habits and health status among Koreans, this survey was conducted using 167 Korean families. One person from each family who had some health problem was asked tl fill out a puestionnaire from April 1996 to June 1996. The collected data was analyzed using a SAS program. The subject' diseases were: hypertemtion (28.3%), constipation(24.7%), gastroenteritis (20.5%), deabetes (15.1%) and obesity(11.4%). The subjects had (a) irregular/compulsive sating disorder(55%), (b) perferred salty (49%), (c) spicy(40%), (d) meat(42%) and (e) oily foods(32%). Female subjects showed a higher frequency of constipation ; and male subjects had a significantly(p〈0.001) higher frequency of hypertention(40.9%) and diabetes (25.8%). Subjects in their 50s showed an incresed salt intake(47.5%) which was correlated with a higher frequency of hypertention (53.3%). A higher frequency of constipation was related to food habits in which subjects did not eat Kimchee(60% from 9% of all subjects) and raw fresh vegetables(34% from 15% of all subjects).
CdSiP₂Chalcopyrite의 고유치와 Raman Shift의 계산
임승혁,정호용,정윤근 麗水水産大學校産業技術硏究所 1995 産業基術硏究所 論文集 Vol.4 No.-
The equations of motion of CdSiP₂with chalcopyrite structure are formulated by using the harmonic approximation method. The force constants are used to two first-neighbor central and one second-neighbor angular force constants following Bettini. With these force constants, dynamical matrix can be obtained. The secular equations constructed from this dynamical matrix are solved by software called mathematica. In this study, we calculated eigenvalue and Raman shift in CdSiP₂chalcopyrite, these are compared with the experimental Raman shifts and Bettini's. Our results explain the Raman shifts fairly good.