토양산도 및 시비량 조절에 의한 연초의 Grey엽 발생방지 효과

이철환,진정의,이동훈,Lee, Chul-Hwan,Jin, Jeong-Eui,Lee, Dong-Hoon 한국연초학회 1994 한국연초학회지 Vol.16 No.2

This study was carried out to get agronomic information about the tobacco culture in paddy soil where incidence of grey tobacco leaves used to appearly uptake of iron, manganese and chlorine due to soil acidity and high water level. Application of lime to paddy soil(pH5.4-5.6) reduced content of iron, manganese known as proceeding materials giving rise to variegated grey tobacco after curing, compared with non-treatment. Grey leaves were found mainly at lower and middle stalk positions, and incidence of grey tobacco was lowered by application of lime in the well drained field but was not affected by level of fertilizer application. Amendment of soil acidity by lime tended to decrease chlorine and manganese content in leaves. Nicotine and mangenese content of leaves were lowered by reduction of one-quarter fertilizer level. In case of lime treatment, increase of yield reached to 4-6% comparing with those of non-treatment but price per kg was not affected. Reduction of N fertilizer level to three-quarters had the equal yield but high quality of leaf comparing with standard fertilization in paddy field.

황색종 cyclic 건조엽의 화학성분 특성

이철환,진정의,한철수,Lee, Chul-Hwan,Jin, Jeong-Eui,Han, Chul-Soo 한국연초학회 1998 한국연초학회지 Vol.20 No.1

The bulk curing experiment to the improve the quality of flue-cured leaves were carried out to evaluate relationship between cyclic curing and conventional curing method. We studied the effect of the cyclic change of wet bulb temperature at the yellowing stage of flue curing on chemical properties of cured leaves. The wet bulb temperature was automatically controlled between preset high($38^{\circ}C$) and low point ($35^{\circ}C$) everyone hour cyclically during 12 hours after starting luring. As a result, the acceleration of the increase in the chemical properties of cured leaves were observed. As to the chemical properties, there was decreased in citric acid, increased in malic acid of the nonvolatile organic acids and all higher fatty acids content of leaves cured by this method compared with in that of conventional curing method, while a major chemical compounds in relation to aromatic essence of cigarette smoke in essential oil components of lured leaves was mostly higher in this method than those of conventional ones, and it was evaluated that there was decreased in CO, TPM, Tar, and $CO_2$ content of the cigarette smoke comparing to the conventional luring method.

사료작물 윤작재배에 의한 연초포지의 제염효과

이철환,진정의,한철수,Lee, Chul-Hwan,Jin, Jeong-Eui,Han, Chul-Soo 한국연초학회 1997 한국연초학회지 Vol.19 No.1

The field experiment for field desalinization by precultivation of orchard crops were carried out to evaluate relationship between the varieation of chlorine contents of soil and crop uptake in the upland diverted from paddy field. After harvest of grass crops, soil samples were taken for analysis of chlorine contents of soil layers. Regardless of kinds of grass crops cutivated, contents of soil chlorine were decreased comparing to non-crop plot. Chlorine content in plant harvested at just before the flowering stage was much higher than that of after flowering. Chlorine uptake and dry matter were increased in order of Italian ryegrass, Perennial ryegrass, and Sudan grass. Positive correlations were showed between chlorine uptake and dry matter. The content of soil chlorine decreased by higher yield of dry matter.

연초 수확엽의 숙도가 색채 및 색소물질 함량에 미치는 영향

이철환,진정의,한철수,Lee, Chul-Hwan,Jin, Jeong-Eui,Han, Chul-Soo 한국연초학회 1996 한국연초학회지 Vol.18 No.1

Field experiment was conducted to get the basic information about the difference in color and plastid pigments at the different stage of harvest of flue-cured tobacco cultivated in paddy field, and compared to upland ones. All tested crops were primed in lots of 3 to 4 at each priming, beginning at the bottom of the plant. Leaf pigments and chromatic values of tobacco leaves were determined in samples collected at weekly intervals, and according to analyses obtained from 4 stalk positions. By the degree of maturity, leaves harvested were separated with visual characters into four classes of immature, mature, ripe and mellow. regardless of stalk position, chlorophyll contents was higher in the order of immature > mature > ripe > mellow, respectively. In fresh leaves, chlorophyll levels was higher with ascending stalk position. chlorophyll a and b in cured leaves were less than 10% of the amount present at harvest, and it was estimated that maturity condition also influenced the rates of degradation of plastid pigments. Fully mature leaves of upland diverted from paddy field showed slightly higher in chlorophyll contents than in those of upland tobacco ones but somewhat lowered in $L^*$ and $b^*$ values, and there was no difference in $a^*$ value.

황색종 연초 황변기 cyclic건조가 건조엽의 물리성에 미치는 영향

이철환,진정의,한철수,Lee, Chul-Hwan,Jin, Jeong-Eui,Han, Chul-Soo 한국연초학회 1998 한국연초학회지 Vol.20 No.1

In the flue curing process, the wet bulb temperature is usually controlled at a constant level. To improve the quality of flue cured leaves, we studied the effect of the cyclic change of wet bulb temperature at the yellowing stage of flue curing on physical properties of cured leaves. The wet bulb temperature was automatically controlled between preset high (38℃) and low point (35℃) every one hour cyclically. As a result, the acceleration of the increase in the physical properties of cured leaves were observed. The leaves cured by this method were more or less orange in color, better bodied, and less brittle compared with the leaves produced by conventional curing. However, the leaves cured by this method had a little sharpness and harshness. As to the physical properties, there was decreased in occurrence of flat leaves than that of conventional ones. On the other hand, in case of cyclic curing method, increase of price per kg reached to 2-3% compared with those of conventional ones.

웹기반 협력 학습을 위한 멀티에이전트간의 통신에 관한 연구

이철환,한선관,Lee, Chul-Hwan,Han, Sun-Gwan 한국정보교육학회 2000 정보교육학회논문지 Vol.3 No.2

본 연구는 웹 기반 협력학습을 위한 시스템에서 학습자의 학습을 돕기 위한 멀티에이전트간의 통신에 관한 연구이다. 우선, 에이전트 시스템에 대한 전반적인 내용과 특정을 고찰하였고 에이전트 상호간의 통신인 KQML에 대하여 살펴보았다. 또한 협력학습을 위한 에이전트 기반의 시스템 구조와 에이전트간의 상호 통신 방법을 제시하였다. Java 언어를 이용하여 협력학습 시스템을 설계 구현하였으며 실험을 통하여 에이전트간의 통신에 의한 협력학습 시스템의 효율성을 고찰하였다. The purpose of the paper is communication between multi-agents for student's learning at web based collaborative learning. First, this study investigated the whole contents and characteristics of an agent system and discussed KQML, communication language between multi-agents. Also, we suggested architecture of an agent based system for collaborative learning and interaction method between agents using KQML. We design어 and implemented collaborative learning system using Java programming language, and we also demonstrate the efficiency of collaborative learning system by communication between multi-agents through experiments.

인사검증기록물관리 현황 및 개선방안 연구

이철환,김장환,Lee, Cheolhwan,Kim, Janghwan 한국기록학회 2023 기록학연구 Vol.- No.77

In the Republic of Korea, which has adopted a strong president-centered system as a political system, comprehensive personnel verification of work ability, reputation, and misconduct for positions where the president has personnel rights is not only fundamental to the administration of the country, but is also very important for maintaining the democratic system. As the records containing the personnel verification process produced during this process also has a wide range of data on important people in the country, they themselves are very important national-level information, and there is a great possibility that they will be used as useful materials for studying current national management in future generations. Therefore, it is assumed that after the enactment of the "Act on the Management of Presidential Records" in 2007, Senior Secretary for Civil Affairs of the Office of the President, which were responsible for the personnel verification, designated a wide range of personnel verification records as presidential designated records and transferred them to the Presidential Archives. However, with the launch of the 20th government, the agency responsible for personnel verification changed from Senior Secretary for Civil Affairs of the Office of the President to the "Personnel Information Management Team" of the Ministry of Justice from June 2022, a major change occurred in the personnel verification process that had been maintained and the preservation of related records. This paper examined what personnel verification records are and how they have been preserved and managed, and proposed what issues have arisen at the record management level due to this change in the agency in charge of personnel verification, and how those issues should be resolved on a practical and institutional level.

무료심판변론제도의 도입에 관한 연구

이철환,Lee, Cheol-Hwan 해양환경안전학회 2005 海洋環境安全學會誌 Vol.11 No.1

해양안전심판에는 징계와 권고 또는 명령 등 개인의 권익에 대한 제한이 뒤따르며, 또한 그 결과는 해양사고 관련 민사재판에도 지대한 영향을 미치게 된다. 우리의 해양안전심판제도에는 해양사고관련자가 심판변론인의 도움을 받을 수 있도록 되어 있지만 그 비용이 만만치 아니한 관계로 경제적인 사정에 따라 제약을 받게 되어 있다. 본고에서는 경제적인 사유로 심판변론인의 도움을 받지 못하여 불이익을 당하는 해양사고관련자들을 위하여 사법제도 등의 유사제도를 검토$\cdot$ 연구한 결과 다음과 같은 방법에 의한 무료 심판변론제도의 도입을 제안한다. 1. 심판법령에 "강제변론주의"와 "국선변론인제도"를 도입하고 그 비용을 국가가 부담 2. 위 제도를 도입하되, 국선변론인을 해사관련단체 소속 임직원 중에 선임하고 비용은 소속단체에서 부담 3. 심판원 산하단체로서 금융지원 등 구조활동을 수행할 "해양안전심판협회" 설립 The Judgement on a certain maritime accident accompany with punishment or recommendation to the examinee who was connected with that accident. It also gives quite a consequence to the Civil Trial relating with the maritime accident. In the Maritime Safety Tribunal System, the examinees can get assistance from Maritime Counselor. As it requires a lot of costs, it should be limited by economic condition of the examinees. In this Paper, with the consideration of the several kinds of Free Counsel System, Free Counsel System for Maritime Safety Tribunal was studied. The proposals are as follows; 1. To introduce the Mandatory Counselling and Court-designated Counselor System. The costs to be paid by government. 2. The same as above but the counselor to be designated among the staffs of the maritime organizations, then the costs to be paid by the organization which they belonged. 3. To establish Maritime Safety Tribunal Association which performs Monetary Assistance same as Korean Legal Aid Corporation.

연초 III형 Grey엽의 발생양상과 화학성분 특성

이철환,진정의,한철수,Lee, Chul-Hwan,Jin, Jeong-Eui,Han, Chul-Soo 한국연초학회 1996 한국연초학회지 Vol.18 No.2

The occurrence and chemical properties of grey tobacco leaves (Type III) found in 1995 crop of flue-cured tobacco cultivated in paddy field were investigated to compare with those of normal leaves. Cured leaves of NC82 were separated by visual characters into 3 classes of slight, fair and severe symptoms of grey leaf by the percentage of grey parts to whole leaf area. Number of samples classified with discoloring portion was the order of greyish brown > reddish brown > greyish yellow, respectively. Grey leaves of this type were mostly found among the leaves harvested from upper stalk position, and it was estimated that growth rate of upper leaves also influenced on the occurrence of grey leaves. Grey leaves showed remarkably lower b* and L* values than those of normal leaves, while a* value was mostly higher in grey leaves. These tendencies in chromatic aberration showed more remarkable difference in the degree of grey symptoms. Chemical analyses of grey leaf samples indicated that they contained less total nitrogen and nicotine, and more total sugar and starch than those of normal leaves. In chemical traits, these tendencies were accordance with the degree of grey symptoms, and within the same leaf, grey parts were decreased in total nitrogen and ether extract content compared with those of normal parts, but there was no difference in nicotine and Cl contents. Key words : grey leaf tobacco (type III), grey symptom, color, chemical properties.

역률 개선을 위한 승압형 컨버터에 대한 연구

이철환(C.H. Lee),김동운(D.U. Kim),이상집(S.G. Lee),성낙규(N.K. Sung),이승환(S.H. Lee),오봉환(B.H. Oh),한경희(K.H. Han) 대한전기학회 2001 대한전기학회 학술대회 논문집 Vol.2001 No.7