韓國에 있어서 溫帶低氣壓 屬性에 의한 降水特性

金成烈,楊辰錫 慶北大學校 師範大學 地理敎育科 1995 地理敎育 Vol.8 No.-

The purpose of this study is to analyze the characteristics of precipitation associated with the attribute of extratropical cyclone in Korea. From now on, extratropical cyclone is called cyclone in short. The principal data used in this study are daily precipitation obtained from 60 weather stations of the Korea Meteorological Service during the ten years(1981∼1990), and weather charts published by the Japan Meteorological Agency. The results obtained in this study are summarized as follows: (1) The amount of precipitation by the Central China Low accounts for 50 percent on an average of the total cyclonic precipitation. In the spatial distribution , the precipitation in the middle-west areas are influenced by the Central China Low and the North China Low, and the precipitation in the southern areas are influenced by the Central China Low and the Taiwan Low. Especially, The Taiwan Low appears rarely in Korea, but its appearance causes heavy rain. (2) When the cyclone passes through the southern area, the precipitation probability is highest and the precipitation intensity is very strong. This is considered the reason why the whole country is influenced by the cyclone. Cyclones passing through the South Sea cause frequent precipitation in the southern area and those passing through the middle and the northern area often cause precipitation in the middle area. (3) When the cyclone moves slowly and its central pressure is become higher, and the precipitation probability is high and the amount of precipitation is large. It is because the pressure energy changes into the precipitation energy. The track of cyclone and topography cause difference in the amount of precipitation amount according to the regions.

계층형 그룹의 서비스와 관리를 위한 이동 에이전트 설계

이석희,김성열 청주대학교 산업과학연구소 2005 産業科學硏究 Vol.22 No.3

Recently, The number of P2P System is on the increase. The P2P system provide us integration service of regional information and search for datas and control of programs in the distance. So Many Applications include P2P systems. Mostly P2P systems have form of Server/Client. The many part of the program must change for insertion or modification of the small function. This paper propose mobile agent system for service and management in hierarchical group.

RBAC 보안시스템에서 관계관리를 위한 관리도구 동작

오석균,김성열 한국정보전략학회 1999 추계공동학술대회 논문집 Vol.- No.01

Role-Based Access Control(RBAC)은 처리과정 오류를 줄이는 것처럼 접근통제 정책의 관리단가를 낮춰준다. RBAC 개념에서 가장 중요한 요소가 관리도구이다. RBAC 보안시스템을 위한 관리도구는 RBAC 데이터베이스에 저장되어 있는 사용자와 역할 관계를 일관성 있게 유지하여야 한다. 본 논문에서는 사용자-역할과 역할-역할 관계를 관리하기 위한 형식 명세를 제안한다. 제안된 형식 명세는 관계 집합처럼 정의된 RBAC 데이터베이스를 위해 일관성 요구를 유지한다. 본 논문은 동작의 형식 명세화를 함으로써 RBAC 관리도구의 구현을 쉽게 이끌어 낼 수 있다. Role Based Access Control(RBAC) reduces the cost of administering access control policies as well as making the process less error-prone. The administration tool is most important component in the concept of RBAC. The administration tool for the RBAC security system is required the consistency of a relationships between user and role in the RBAC Database. In this paper, we propose formal specification in order to manage user-role and role-role relationships. The proposed formal specification leads to the consistency requirements for the RBAC database which are defined as a set of relationship. This paper can easily derive the implementation of the RBAC administration tool by formal specification of operations.

순환골재를 사용한 콘크리트 보의 구조적 특성에 관한 연구

김정섭,신용석,노성열 朝鮮大學校 建設技術硏究所 2007 建設技術硏究 Vol.27 No.1

This study identified materials and dynamic characteristics of reclaimed aggregates affecting reinforced concrete through materials and supplementary tests to use broken red bricks and waste concrete as substitutes of concrete and obtained the following results. As a result of the bending specimen test according to types of reclaimed aggregates, it was found that when normal concrete was compared with reclaimed concrete. RBA 30% specimen showed 99-104% of yield load and RCA 30% specimen showed 102-104% of yield load, which were the yield load and the largest yield load of normal concrete. Therefore, it is believed that RBA 30% and RCA 30% specimens has almost similar bending strength to ormal concrete. To sum up the results of material and supplementary tests, the mixed aggregates showed almost the same compressive strength and bending strength compared to that of normal concrete when 30% of broken red bricks and waste concrete were mixed. So this study suggests that they can be applied as thick aggregates.

초음파속도법을 이용한 혼화재 및 섬유 사용 콘크리트의 압축강도 추정에 관한 연구

김정섭,신용석,노성열 朝鮮大學校 建設技術硏究所 2007 建設技術硏究 Vol.27 No.1

This study aims to estimate strength approximate to actual concrete strength by presenting appropriate non-destructive strength estimation expression with admixtures such as fly ash, blast furnace slag and silica fume which are used as cement substitute and polypropylene fiber and steel fiber and owing to their s of cement owing to their equal conditions to blending characteristics of concrete used for domestic structures and their recyclable properties. In case of ultrasound velocity, equation by Japanese Architecture Society was estimated 4%~11% higher than destructive strength till 60 days of age, but as age progresses, i is estimated to 15% lower than destructive strength and remaining suggested equation was estimated 3%~27% lower than destructive strength in almost age. As a result of comparing error rates between conventional suggested equations and this estimation equations, there are a little differences by age, but error rate of this study was reduced to 0.6%~18.6% by ultrasound velocity method and it is judged that it is desirable to be used for concrete using admixture and fiber

반발경도법에 의한 혼화재 및 섬유사용 콘크리트의 압축강도 추정

김정섭,신용석,노성열,김정훈 朝鮮大學校 建設技術硏究所 2007 建設技術硏究 Vol.27 No.2

This study aims to estimate strength approximate to actual concrete strength by presenting appropriate rebound method strength estimation expression with admixtures (fly ash, blast furnace slag, silica fume) which are used as cement substitute and polypropylene fiber and steel fiber and owing to their s of cement owing to their equal conditions to blending characteristics of concrete used for domestic structures and their recyclable properties. In case of rebound hammering, equation by Japanese Architecture Society was estimated 26~40% higher than destructive strength and remaining suggested equation was estimated 2%~18% lower. In case of ultrasound velocity, equation by Japanese Architecture Society was estimated 4%~11% higher than destructive strength till 60 days of age, but as age progresses, is estimated to 15% lower than destructive strength and remaining suggested equation was estimated 3%~27% lower than destructive strength in almost age. In case of complex methods, all suggested equations were estimated to 24%~94% higher than destructive strength. Since application of existing expression of normal concrete against concrete using admixtures and fiber causes error rate, this study suggests the following estimation expression depending on the kind of admixtures and fiber of concrete using them and position of non-destructive experiment. C-N f_(cu)=1.6R-25.43(R²=0.90), C-FA f_(cu) = 1.07R-8.76 (R²=0.82), C-BF f_(cu)=1.46R-23.09(R²=0.92) C-SF f_(cu) = 1.55R-22.96(R²=0.89), C-PP f_(cu) = 1.16R-12.24(R²=0.73), C-S f_(cu)=0.99R-8.07(R²=0.86)

Population Genetic Structure of the Japanese Oak Silkmoth, Antheraea yamamai (Lepidoptera: Saturniidae), Inferred from Novel Microsatellite Markers and Mitochondrial DNA Gene Sequences

Seong Ryeol Kim,Kee Young Kim,Jun Seong Jeong,Min Jee Kim,Ki-Hwan Kim,Kwang Ho Choi,Iksoo Kim 한국응용곤충학회 2017 한국응용곤충학회 학술대회논문집 Vol.2017 No.04

The Japanese oak silkmoth, Antheraea yamamai Guérin-Méneville 1861 (Lepidoptera: Saturniidae), is one of the important natural resources possessing industrial value for silk fiber production. In this study, ten microsatellite markers and two mitochondrial DNA (mtDNA) gene sequences (COI and ND4) were used to investigate the genetic variation and geographic structure of A. yamamai populations in South Korea. Two mtDNA gene sequences revealed very low total genetic variation and resultant low geographic variation, validating to use further variable molecular markers. Population-based FIS, FST, RST, and global Mantel test consistently support that A. yamamai populations are overall well interconnected with a relatively high gene flow. Nevertheless, STRUCTURE analysis using microsatellite data and mtDNA sequences coincidently indicate the presence of two genetic pools in many populations.

3 to 30 MHz Hartley-VCO using Temperature-Stable Linear OTAs

Seong Ryeol Jeong,Won Sup Chung 한국정보기술학회 2015 JOURNAL OF ADVANCED INFORMATION TECHNOLOGY AND CON Vol.5 No.1

Mechanical Properties and Shrinkage of Injection Molded Elastomers

Seong Ryeol Han,Seung Gyeong Jeon,Joon Hyung Kim,Yeong Deug Jeong 한국소성가공학회 2006 플라스틱가공 심포지엄(한일 공동 세미나) Vol.2006 No.9

Effects of Process Variables on the Gas Penetrated Part in Gas-Assisted Injection Molding

Seong-Ryeol Han,Tae-Won Park,Yeong-Deug Jeong 한국정밀공학회 2006 International Journal of Precision Engineering and Vol.7 No.2

Gas-assisted injection molding (GAIM) process reduces the required injection pressure during mold filling stage as well as the shrinkage and warpage as the part and cycle time. Despite of these advantages, this process needs new parameters and makes the application more difficult because gas and melt interact during the injection molding process. Important GAIM factors involved in this process are gas penetration design, locations of gas injection points, shot size, delay time to inject gas as well as common injection molding parameters. In this study, the experiments are conducted to investigate effects of GAIM process variables on the gas penetration jar PP (Polypropylene) and ABS (Acrylonitrile Butadiene Styrene) moldings by changing the gas injection point. Taguchi method is used for the design of the experiments. When the gas is injected at a cavity s center: the most effective factor is the shot size. When the gas is injected at a cavity's end, the most effective factor is the melt temperature. The injection speed is also an effective factor in GAIM process.