Emulsifier - free emulsion polymerization of Styrene - Butadiene Rubber ( SBR )

정희실,이창성,신영조 한국고분자학회 1992 한국고분자학회 학술대회 연구논문 초록집 Vol.1992 No.4

Strene / Butadiene / Acrylonitrile 계 무유화제 유화중합

정희실,신영조 ( Huey Sil Chung,Young Jo Shin ) 한국공업화학회 1993 공업화학 Vol.4 No.2

AN을 친수성 공단량체로 하고, KPS를 개시제로 하여 St/BD의 무유화제 유화중합을 해 본 결과, 전환율 50% 이하에서 Rp의 [AN]^n 및 [KPS]^n에 대한 의존성은 각각 n=1.617-1.050 및 n=0.83-0.96을 보였으며, 입자수 밀도(Np)의 [AN]^n 및 [KPS]^n 의존성은 n=1.533 및 n=0.733이었다. 그리고 pH=5 , 총단량체 (g)/물(g)=0.5일 때 전환율이 가장 높았으며, 얻어진 SBR은 상용 SBR에 비해 가류속도가 훨씬 빠르고, tensile strength, 300% modulus, elongation 등 기본 물성에서 열세였다. The soap-free emulsion polymerization was carried out for Styrene/Butadiene system with Acrylonitrile as hydrophilic comonomer and KPS as initiator. Under the condition of below 50% conversion, the dependence of Rp on [AN]^n and [KPS]^n was found to be n= 1.617-1.050 and n=0.83-0.96 for [AN] and [KPS], respectively. The effect of [AN]^n and [KPS]^n on particle number density (Np) was determined to be n= 1.533 and n=0.733, respectively. The highest conversion was obtained under the conditions of pH=5 and ratio of total monomer (g) to water (g) =0.5. The mechanical properties of SBR obtained in this experiment were shown to be inferior to commercial SBR in terms of tensile strength, 300% modulus and elongation. It was found that cure rate of SBR prepared in this experiment was faster than that of commercial SBR.

소양호 저층퇴적물의 환경퇴적학적 특성

정희만,정대교,김기영,황인영 대한지질학회 2002 대한지질학회 학술대회 Vol.2002 No.

약주(藥酒)를 이용한 항암치료(抗癌治療)에 관한 문헌적(文獻的) 고찰(考察)

정희,강재춘,Jung, Hee,Kang, Jae-Chun 대한암한의학회 1999 大韓癌韓醫學會誌 Vol.5 No.1

Anti-cancer medi-alcohols in oriental herb prescriptions were divided by chef effects. Each medi-alcohols were analyzed and studied abut frequency, character, target, effect. Also, they were divided into the method of making medi-alcohols. The results were summerized as follows. 1. The department of using medi-alcohol in anticancer herbal scriptions were limited in gynecology, dermatology and digestive internal medicine. There were a lot in gynecology. 2. In analysis about medi-alcohols of dermato scriptions by chef effect, the herbs of relieving exterior syndrome were a lot first and the herbs of invigorating-qi were second. 3. In analysis about meld-alcohols of dermato scripions by chef effect, the herbs of promoting blood circulation to remove blood stasis were a lot first and the herbs of invigorating-qi were second. 4. The method of making medi-alcohol was divided into four types ; boiling, making up pills, extration, filtration. I hope that the medi-alcohol will be used as practional references.

전기차 배터리의 히트 싱크 유무에 따른 냉각성능에 관한 연구

정희도,김건형,박찬우,이동렬 한국기계기술학회 2016 한국기계기술학회지 Vol.18 No.6

Recently, as demand for Electric Car has been increasing, it has been a main factor that maximizing performance and ensuring the stability of the Electric Car battery to increase the reliability of Electric Car. Above all the study on thermal control in a big influence on the performance and battery life is growing in parallel. This study has compared cooling effect of an Electric Car battery between battery with Heat Sink and without Heat Sink for optimum design of Electric Car battery. Battery is simply modeled into four cells, divided into two cases of battery with Heat Sink that attached on the cell's side and without Heat Sink. And this research was conducted on forced convection. The battery which is designed by this way was numerically analyzed by CFX 14.5. Numerical results, revealed that the battery with Heat Sink was superior in terms of cooling effect. According to the numerical analysis by battery cell's temperature variations, the battery with Heat Sink turned out to be superior in cooling effect to the battery without Heat Sink.

성요한초제제 임상시험 고찰을 통한 한약기원 항우울제 임상시험 방법론 연구

정희,이지형,장보형,고성규,Jung, Hee,Lee, Ji-Hyung,Jang, Bo-Hyoung,Ko, Seong-Gyu 대한한방내과학회 2007 大韓韓方內科學會誌 Vol.28 No.2

Objectives : This study was undertaken to learn what should be considered in a good clinical trial investigating a herbal medicine as an antidepressant. Methods : Five well-designed clinical trials published from 2000 to 2006 investigating SJWE in depressive disorder were selected. The trials were reviewed and compared in terms of methodology such as trial design, patient selection, efficacy & safety evaluation, and so on. On the basis of this review of the trials and the regulations and guidelines of KFDA, we suggest some points to be considered for a good clinical trial of a herb for depression. Results : Although every trial had its own unique design, procedure, objectives and so on, all trials used randomizing and double blinding methods. If there is no ethical problem, a placebo-controlled design should be considered in a herbal antidepressant clinical trial for depression. Conclusions : Some points to be considered in an optimal & good clinical trial for an antidepressive herbal medicine were suggested as follows: 1) randomizing and double blinding manner is essential, 2) if there is no ethical problem, placebo control design should be considered, 3) the trial period should be 6 weeks, 4) out-patients will be recruited as subjects, 5) investigators will be well-trained psychiatrists or medical doctors, 6) the number of subjects should be calculated by statistical methods, 7) subjects should be diagnosed by DSM-IV criteria, 8) subjects who have current risk of committing suicide should be excluded, etc.

다문화담론 (I). PD의 눈으로 바라본 다문화가정

정희도 국제다문화의사소통학회 2012 국제다문화의사소통학회 학술대회 Vol.2012 No.11

영어 형용사 ‘heavy’와 한국어 형용사 ‘무겁다’의 의미 비교

정희란 새한영어영문학회 2022 새한영어영문학 Vol.64 No.1

This study investigates the meaning of the adjective HEAVY by comparing the English adjective ‘heavy’ and its Korean corresponding expression ‘mugeopda’. To accomplish this goal, the lexical typology presented by François(2008) has been adopted. It introduces the term collexification which refers to instances where two or more functionally different senses are expressed in the same lexical form. This also focuses on the senses of the two adjectives and includes semantic maps, which are comprised of etic grid and emic categorization of the adjectives. The outcomes from the research are as follows; the adjective HEAVY has four core senses, {weight}, {amount}, {burden} and {force}, and each sense is divided into its smaller semantic areas according to the types of noun collocations. For example, {weight} has two areas: <human> and <non-human>, {amount}: <used> and <loaded>, {burden}: <mental> and <disciplinary>, <atmospheric>, and <disease>, {force}: <intensive>. The English adjective ‘heavy’ has all four senses while Korean ‘mugeopda’ has only two senses, {weight} and {burden}. Also, the English adjective ‘heavy’ colexies most of the senses, except for some senses belonging to {weight} and {burden}. For Korean adjective ‘mugeopda’, it does not colexify <texture> in the sense of {weight}.

Development of Polymorphic SSR Markers from Pinus densiflora (Pinaceae) Natural Population in Korea

정희,이재복,길진수,엄유리,김지현,황민영,김호방,홍창표,Shin Gi Park,심동환,이이 한국육종학회 2019 Plant Breeding and Biotechnology Vol.7 No.1

Simple sequence repeat (SSR) markers were developed from Pinus densiflora, a species native to Asia, to investigate its genetic diversity and population structure in order to provide information for the management and breeding of this species. Using next-generation sequencing, a total of 1,008 putatively polymorphic SSR primer sets were designed. Seventeen polymorphic SSR markers in 121 individuals belonging to four natural populations of P. densiflora were identified and characterized, with three to seventeen alleles per locus. The expected heterozygosity ranged from 0.1844 to 0.8731 in four populations, and the average of the PIC values ranged from 0.2789 to 0.8488. Cross amplification of these markers was performed among the related species P. rigida, P. koraiensis, P. parviflora, and P. bungeana. The developed novel SSR markers are promising tools for studying the genetic diversity or population structure of P. densiflora and its related species.

經營費用의 發展形態

鄭禧基 東亞大學校 1964 東亞論叢 Vol.2 No.1

The aim of accounting lies in grasping numerically the whole activities of a business management. It is a study of various principles concerning expense, revenue and profit, based on the numeral grasp of the flow of value accompanying the activities of management, or of the process of circulation of an individual capital. It is possible to determine the stage of the optimum output and the maximum profit operation degree only by comprehending the various principles of management expense which varies with the operation degree. And through the comprehension of these principles, one is also able to establish the operation policy, price policy, cost control, profit planning, etc. of a business management. These principles can also be applied to the establishment of a rational management control and various management policies. This study discusses the nature of various specific expenses as component parts of the whole expense of a business management. It also discusses a general and typical process of variations in the whole expense in accordance with the varied nature of marginal costs and average variable costs derived from the various forms of the theoretical development of the whole expense. An argument is also given to the optimum output and the maximum profit operation degree which are derived from an interrelationship of the whole expense, the marginal costs, and the average variable costs. A further attention is given to the problem of break-even point.