Reviews for Modeling Consumer Choice for Bundles

Chung, Jai-Hak 서강대학교 경영연구소 2004 서강경영논총 Vol.15 No.2

영어 수동구문의 by-phrase와 한국어 수동구문의 -에/에게

조학행,정병균 조선대학교 인문학연구소 2001 인문학연구 Vol.25 No.-

The main purpose of his paper is three-fold: First, we summarize the arguments that by-phrase in English passives is an adjunct, not an optional complement and analyse the passive constructions on the basis of hypotheses of Bouma, Malouf & Sag(1998). That is, the prepositional phrase, by-phrase, has been treated as an adjunct in previous studies so far: Kiparsky(1987), Grimshaw(1990),Wechsler(1995) and Jo & Chung(2000). Second, we point out that the dative particle -ey/eykey shows that it is a postposition rether than a morphological case-marker. We use the various tests to see if -ey/eykey is a case or a postposition. Third, on the basis of Urushibara(1991), O'Grady(1991) and Chung(1995), we argue the -ey/eykey in Korean passives should not be a complement but an adjunt. Empirically, we have also demostrated that our argument enable us to analyse further Korean passive types in Korean.(Chosun University)

심근의 전기적 및 기계적 성질에 미치는 부자 부타놀 분획의 효과

정학기,조성일,엄대용,이상돈 중앙대학교 의과대학 의과학연구소 1981 中央醫大誌 Vol.6 No.3

In order to investigate the action mechanism of Aconiti tuber butanol fraction (ABF) on the isometric contraction of cardiac muscle cells, transmembrane potential and action potential which was picked up by 3 M KCI glass microelectrode were recorded at the same time in rabbit papillary muscle preparations from right ventricles. The isometric contraction and action potential were recorded from the papillary muscles superfused in the control Tyrode solution and ABF Tyrode solution in which the preparations were kept beating (lHz) for about 30 minutes to get stable data. The resting membrane potential, amplitude of action potential, the amplitude of overshoot potential, time to repolarize 60%, 90% of the amplitude of action potential and the first derivatives of potential variations in plateau and repolarization were analyzed from recorded transmembrane action potential control Tyrode solution and ABF (5×10^-4~2×10^-3gm/ml)-Tyrode solution in wihth howesd about in 150% of positive isotropic effect compared with those controls. The following results were obtained to compare those parameters in the controls and in the ABF-Tyrode groups: 1. ABF shortened the time-to-peak tension from the value of 155 ms in the controls to 138 ms in. the experimental groups (0.05<p<0.1). 2. ABF showed almost no effects on resting membrane potential, amplitude of action potential and amplitude of overshoot potential. 3. ABF significantly shortened the time to repolarize 60% and 90% of the action potential amplitudes from 209 ms and 271 ms in the controls to 186 ms and 237 ms in the ABF-treated groups (0.05<p<0.1). Therefore the maximum values of the first derivatives of potential variations (-Vmax) in the. plateau phase and repolarization phase were also significantly increased from 16.5V/sec in the control groups to 18.7V/sec in the ABF-treated groups. The above results could be interpreted as that the effect of ABF on cardiac muscle was due to enhancement of slow inward current, especially calcium current.

排水系統이 蒸發散量과 排水量에 미치는 影響

鄭相玉,尹學基 慶北大學校 1992 論文集 Vol.52 No.-

The effects of drainage system on evapotranspiration and drainage flows are studied. Data from drainage field experiment at Castalia in North Central Branch, Ohio Agricultural Research and Development Center were used in this study. A water table management model, ADAPT(Agricultural Drainage and Pesticide Transport), which was developed by combining the GLEAMS and the subsurface drainage part of the DRAINMOD model with several modifications, was used to predict hydrologic components. The ET is very much affected by the presence of subsurface drainage system but not significantly affected by the surface drainage system. The combined surface and subsurface drainage system gives the largest total outflow values while the surface drainage system gives the smallest. Comparisons of model predicted and measured drainage values are in satisfactory agreements. The model predicted values are within the range of the variations of the observed replications in general. Based on this study, the ADAPT model can be used in designing water table management systems.

Molybdenum의 납유도성 신경계 독성저감 메커니즘 연구

정명규,박성환,김학희 한국공업화학회 2002 응용화학 Vol.6 No.2

Effects of molybdenum on lead-induced neurotoxicity were investigated in sciaticnerve isolated from rat. The mechanism on toxicity reduction was examined byinvestigating tissue accumulation of lead, changes of nerve conduction velocity andconcentrations of metabolites related to function of sciatic nerve in rats treated with10ppm-lead, 1mg/kg-molybdenum and both, respectively. In lead-intoxicated rat, theconduction velocity, myo-inositol concentration and Na'/K'ATPase activity of sciaticnerve were decreased by about 30%, 45% and 56%, respectively However, molybdenumtreatment significantly normalized the conduction velocity, Na'/K'ATP ase activity and myo-inositol concentration of sciatic nerve in lead-intoxicated rat. Also, molybdenum treatment decreased the contents of lead in blood and sciatic nerve through promtion of urinary excretion of lead. These results suggest that molybdenum prevented neuropathy not only by reducing lead contents in sciatic nerve and blood, but also by enhancing Na'/K' ATPase activity in sciatic nerve.

2.45GHz ISM 대역의 송신 전력 제어를 위한 전력 검출 기법 비교 연구

정명래,이상원,김학선,이윤현,이형재 대전산업대학교 반도체기술연구소 1999 半導體技術硏究所報 Vol.1 No.-

본 논문에서는 2.45GHz ISM 대역의 전력 제어시 추정 오차를 줄이기 위하여 콘덴서를 이용한 직접 결함 전력 검출기와 방향성 결합기에 의한 전력 검출기를 설계하여 전압 감도, 대역폭, 기판 크기 등의 특성을 비교. 분석하였다. 측정한 결과, 전압 감도는 입력 전력이 -50dBm 에서 -25dBm까지는 전압 감도가 거의 비슷하지만 -25dBm에서 -10dBm까지는 방향성 결합기에 의한 전력 검출기의 전압 감도가 최대 3.5㎶/㎼ 정도 우수하며, 대역폭은 방향성 결합기에 의한 전력 검출기가 콘덴서를 이용한 직접 결합 전력 검출기보다 63MHz 더 넓었다. 그러므로 전력 제어를 위한 검출기 선정시에 송신기의 출력 레벨이 -20dBm 이하인 경우는 특성이 비슷하므로 기판 크기를 줄이기 위해서는 콘덴서를 이용한 전력 검출기를 선정하는 것이 좋고, -20dBm 이상 또는 광대역의 경우는 전압 감도를 고려하여 방향성 결합기에 의한 전력 검출기를 선정하는 것이 추정 오차를 줄일 수 있다. In this paper, we designed the power detector with the capacitor to decrease the estimation error and directional coupler which are used in 2.45GHz ISM band, also compared and analyzed the characteristics of the power sensitivity to estimate the performance of detector, the bandwidth and the printed circuit board size. As the results, their voltage sensitivity is constant from -50dBm to -25dBm which is the input power, but the detector composed by the directional coupler is superior about 3㎶/㎼ than that by the single diode from -25dBm to -10dBm and its bandwidth is wider about 63MHz than the directional coupling power detector with the capacitor. Therefore when the output level of transmiter is below -20dBm, the power detector with the capacitor had better be selected as the detector for the power control to reduce the area because of the similar characteristics, and above -20dBm or in the wide band system, the estimation error can be eliminated by the selection of directional coupler considered the voltage sensitivity for the power detector.

한국에서 관측된 산성강수와 대륙적인 중국의 대기오염 이동

정용승,김학성,박기현 한국교원대학교 환경과학연구소 2002 환경연구논문집 Vol.- No.7

1990년부터 청원(KHN)의 농촌기역에서 산성강우가 관측되었다. 청원의 10년 관측과 함께 다른 6개의 배경 관측소에서도 강우가 채집 및 분석되었다. 산성비는 전 관측에서 자주 발생되었다. KHN 에서는 다른 10년의 강수량 가중평균 VWM 값이 4.67이고 산술평균 값은 5.09이다. 일반적으로, 봄 철 황사가 발생될 때 pH 값이 높았으며, 여름철에는 비교적 중성 값을 보였다. 다른 계절에는 산성 강수가 대개 기류와 관련되었으며, 중국의 중부와 남부지방에서 오는 기류와 저기압은 한반도에서 낮은 pH 값을 발생시켰다. 1996년부터 인공위성을 이용 동아시아 대기오염의 장거리 이동을 모니터링하고 있으며, 황해를 지나 한반도에 이동되는 대기오염의 장거리 이동 사례를 많이 수집하였다. 한국의 산성비는 중국의 발원지로부터 공기의 지나온 분석, 산성 안개와 박무도 논의 되었다. Acid rain at a rural site in Chongwon(KHN), central Korea has been under observation since 1990. To substantiate the 10-year observations, rain samples from six other sites were also collected and analyzed. Results show that acid rain occurred frequently at all sites, At KHN, seasonal and annual variability of pH values had a 10-year VWM value of 4.67 and an arithmetic mean value of 5.09, In general, a high value of pH occurred during springtime when the occurrence of yellow sand (dust) was prevalent in East Asia; during summer, heavy rain usually contained neutral pH values. During other seasons, the degree of acidic precipitation usually coincided with certain air flows. Most frequently, air flows and cyclones coming from south and central China often resulted in precipitation with low pH values observed in Korea. Using daily satellite observations from 1996, we have also been monitoring the large-scale transport of air pollutants over East Asia. Many samples of long-range transport of air pollutants (LRTAP) were obtained when they were crossing the Yellow Sea and moving over the Korean Peninsula. Cases of acid rain in Korea clearly correlate wth the LRTAP from source regions in China. In this study, results of air-parcel trajectory, plus acid fog and mist analysis are discussed.

전기소설 <劉少娘傳> 연구

정학성 한국고소설학회 2003 古小說 硏究 Vol.16 No.-

<유소랑전(劉小랑傳)>은 17세기 전기소설집 『신독재수택본 전기집』에 실려 있는 소설 작품이다. 본고에서는 첫째로, 작품 내외에서 대응되는 몇 가지 사실들을 근거로 이 작품이 중국에 원작의 출처나 원천을 두고 있음을 밝혔다. 둘째로, 작품 분석을 통해 열녀전과 전기(傳奇) 소설의 성격이 혼합 또는 합성되어 있는 작품 내용 및 형식 상의 이중적 성격과 함께, 순절을 미화하는 사대부적 이념을 벗어나지 못하면서도 그 비극적 희생을 비판적으로 형상하고 있는 작가의 이율배반적인 의식 및 전기소설로서 작품의 가치를 논진하였다. 셋째로, 조선에서 이 작품이 수용되던 배경으로 17세기 중엽 이래 가부장제와 함께 상례(喪禮) 의식과 열절(烈節)의 관념이 강화되던 사대부 사회와 사상의 동향을 살피고, 당근대 중국의 전기(傳記)적 사실이 (傳奇)로 용해ㆍ전성된 작품 수용의 소설사적 의미를 열녀전의 전통 및 소설 발달사 측면에서 살폈다. Yusorangcheon(劉少娘傳) is a short story that is included in The Collection of Romantic Fictions revised by Shindokjae(愼獨齋手澤本傳奇集) which is generally considered to be an anthology of 17th century works. My argument in this paper, the first research work on Yusorangcheon ever, is three-fold. First, I argue that the source or the original work of this short story came probably from China. Set in southern China, the story features a historical character from this region during the Ming era. This character was apparently famous in southern China yet unknown to Chosun. The theme of a fiance´e's sacrificial suicide as an expression of her loyalty to her dead fiance´ was quite popular in the literary works of the late Ming era in China especially in Cheon-gi(傳奇) drama but not in Chosun. In China there is also a historical record of an incident that might have served as a source for Yusorangcheon. Secondly, this paper examines the dual character of the work's genre and the author's ambivalent attitude towards the fiance´e's sacrificial dying. Yusorangcheon combines two genres, biography of virtuous women(烈女傳) and Cheon-gi, in its subject matter and form. The author, never free from the biases of Sadaebu(士大夫), glorifies the fiance´e's tragic sacrifice but at the same time blames the suicide. Although this work cannot match Cheon-go in its aesthetic quality and the extent of the progressive nature its theme, its realistic and critical description of contemporary society and its contradictions in morals and ideologies, nevertheless, follow the tradition of Cheon-gi. Thirdly, this paper surveys the historical context in which this work was accepted in the 17th century Chosun and tries to locate the significance of the distribution of this work. When considered in light of the socio-historical trend in and after 17th century Chosun which emphasized the ideas of funeral rites and wives' sacrifice for husbands as well as the idea of patriarchy, this work raises a question about the climate of reading in which biographies of so-called virtuous women prevailed and about the contemporary social atmosphere in which male-centered viewpoints glorified wives' sacrificial death. This work also shows some aspects of the 17th century Korean Cheon-gi history in which Cheon-gi dissolves itself into various spectrum combining other narrative such as biography, and developed under the rapid influence of Chinese literature.

압축철근을 가진 철근콘크리트 보의 최적단면에 관한 연구

정귀훈,黃鶴周 연세대학교 산업기술연구소 1977 논문집 Vol.7 No.1

This study is to carry out on optimum proportioning of doubly reinforced concrete rectangular sections based on both working stressed design theory and ultimate stressed design theory for the minimum cost design. Cost objective function for minimizing the construction cost is obtained by considering the cost of steel, concrete forming and the cost of increasing the building height. And the design constraints used are the flexural moment, ratio of the area of compressive reinforcement to tension one, ratio if the width to the effective depth, and the minimum steel ratio. The objective function and design constraints are transformed into the set of successive linear programming problems using the Taylorseries expanson and computer programis developed for the implementation of the above formulations and algorithm. By the numerical examples, it has been observed that the optimum proportioning of doubly reinforced concrete sections results in significant savings in the construction cost, and especially comparison of method of design is performed in economical view.

4-Vinylpyridine과 Methylmethacrylate의 共重合

鄭明秀,金祐埴,李學沂 경북대학교 공과대학 1973 工大硏究誌 Vol.2 No.-

Using n-butyl lithium as an initiator and n-hexane as a solvent, 4-vinylpyridine was copolymerized with methylmethacrylate at 0℃ and copolymer composition curve was obtained. Also the monomer reactivity ratios of this copolymerization system were determined by Fineman-Ross method. The mechanism of this copolymerization was discussed by these results.