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김민우 ( Min-woo Kim ),김영기 ( Youn-ki Kim ),김기식 ( Ki-sik Kim ),최규진 ( Guy-jin Choi ),유환수 ( Hwan-soo Yoo ) 한국정보처리학회 2017 한국정보처리학회 학술대회논문집 Vol.24 No.2
최근 프로그래밍 교육에 대한 요구가 그 어느때보다 높아지고 있다. 특히 프로그래밍교육이 초등학교때부터 의무화되는 2018 년을 맞이하여, 수많은 프로그래밍 교육을 위한 연구가 진행되고 있다. 본 논문에서 제안하는 트라이코딩은 게임을 사용하여 학생 스스로가 프로그래밍 및 알고리즘을 학습할 수 있다. 트라이코딩은 기존의 블록기반 및 그림 기반의 프로그래밍 교육을 거친 학생 또는 처음 접하는 학생도 쉽게 게임을 통하여 프로그래밍에 대한 지식을 습득할 수 있게 설계를 하였다. 프로그래밍 언어는 기본적으로 영어를 기반으로 하고 있기 때문에 기초 영어에 대한 이해도가 없이는 이 게임을 진행하기는 힘들어, 추후 게임내에서 사용되는 기초영어 정도는 이 게임에서 학습할 수 있게 하는 시스템이 필요하다.
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자바 클래스 파일 암호화를 이용한 자바 역컴파일 방지기법
김영기(Kim Young Ki),윤희용(Hee Yong Youn) 한국정보과학회 2009 한국정보과학회 학술발표논문집 Vol.36 No.1C
자바 프로그램은 자바 컴파일러에 의하여 자바 바이트 코드로 변환되어 클래스 파일 형태로 배포된다. 자바 바이트 코드는 내부적으로 소스 코드를 복원하기 위한 정보를 포함하고 있으며 자바 역 컴파일러에 의하여 쉽게 자바 소스 코드로 변환 될 수 있다. 따라서 자바 역 컴파일러에 의한 소스 코드 노출을 막기 위한 방지 기법이 필요하다. 본 논문에서는 자바 소스 코드 역 컴파일 방지를 위하여 자바 클래스 파일에 대한 암호화와 암호화 된 자바 클래스 파일을 복호화 하는 방법을 제시하고자 한다.
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반응표면법을 이용한 1,200㎜ 급 축류 펌프 임펠러 형상 최적설계
강현수(Hyun-Su Kang),김영기(Young-Ki Kim),김윤제(Youn-Jea Kim) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
In this study, a method for optimal design of impeller blade in the axial pump using response surface method (RSM) was studied. Numerical simulation was conducted using ANSYS CFX with various values of impeller parameter, which consist of three leading edge (LE) angles. Each of the parameters was divided into 3 levels. Total 15 design points were planned by central composite design (CCD) which is one of the design of experiment (DOE) techniques. Response surfaces generated that based on the results of DOE were used to find the optimal shape of impeller blade. The whole process of optimization was conducted using ANSYS Design Xplorer (DX). Through the optimization, the efficiency and the total head, which are the main performance parameters of the axial pump, were increased.
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한성반문잠품종을 이용한 누에동충하초 및 숫번데기의 동시 생산체계
지상덕 ( Sang Duk Ji ),김남숙 ( Nam Suk Kim ),강필돈 ( Pil Don Kang ),성규병 ( Gyoo Byung Sung ),홍인표 ( In Pyo Hong ),류강선 ( Kang Sun Ryu ),김영기 ( Young Ki Kim ),남성희 ( Sung Hee Nam ),김미자 ( Mi Ja Kim ),김기영 ( Kee Youn 한국잠사학회 2012 한국잠사곤충학회지 Vol.50 No.2
This study was conducted to confirm the mass production of male pupae and sex-limited larval marking variety as a host for synnemata production of Isaria tenupes in RDA(Rural Development Administration). Silkworm pupation, infection rate and synnemate formation of I.tenuipes were examined. Among the silkworm varieties tested, male Hansaengjam showed the highest pupation rate at 98.7%. I. tenuipes infection rate of larvae of newly-exuviated 5th instar silkworm was 83.7 ~ 90.4% in the spring rearing season and 91.7 ~ 96.6% in the autumn rearing season. Synnemata production of I. tenuipes was execellent in female Yangwonjam with an incidence rate of 99.5% followed by male Yangwonjam(99.5%) and Baegokjam(99.4%) in the spring and autumn rearing season. Synnemata living weight ranged from 0.93 ~ 1.25 g in the spring rearing season. The female Hansaengjam had the heaviest synnemata weight(1.25 g). Synnemata dry weight ranged from 0.27 ~ 0.35 g in the spring rearing season. The female Yangwonjam had the heaviest synnemata weight(0.35 g).
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박국남(Kook Nam Park),이종민(Jong Min Lee),윤영중(Young Jung Youn),전형길(Hyung Kil June),안성호(Sung Ho Ahn),이기홍(Kee Hong Lee),김영기(Young Ki Kim),케네디(Timothy C. Kennedy) 대한기계학회 2009 大韓機械學會論文集A Vol.33 No.2
The Fuel Test Loop(FTL) which is capable of an irradiation testing under a similar operating condition to those of PWR(Pressurized Water Reactor) and CANDU(CANadian Deuterium Uranium reactor) nuclear power plants has been developed and installed in HANARO, KAERI(Korea Atomic Energy Research Institute). It consists of In-Pile Section(IPS) and Out-of Pile System(OPS). The IPS, which is located inside the pool is divided into 3-parts; the in-pool pipes, the IVA(IPS Vessel Assembly) and the support structures. The test fuel is loaded inside a double wall, inner pressure vessel and outer pressure vessel, to keep the functionality of the reactor coolant pressure boundary. The IVA is manufactured by local company and the functional test and verification were done through pressure drop, vibration, hydraulic and leakage tests. The brazing technique for the instrument lines has been checked for its functionality and performance. An IVA has been manufactured by local technique and have finally tested under high temperature and high pressure. The IVA and piping did not experience leakage, as we have checked the piping, flanges, assembly parts. We have obtained good data during the three cycle test which includes a pressure test, pressure and temperature cycling, and constant temperature.
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切斷性 神經腫痛에 對한 새로운 治療法 : Ⅰ. 實驗的 觀察
沈輔星,金永基,尹金重,崔吉洙 서울대학교 1966 서울대학교 論文集 Vol.17 No.-
In an effort to supress pain from amputation neuroma, the neuroma bearing nerve was transected and re-sutured at various points proximal to the neuroma, and obtained very satisfactory results in eight patients. In this study the unilateral sciatic nerves of dogs and rabbits were severed at three points, each one cm. apart, and resutured, and the opposits sciatic nerves were simply amputated, in order to obesrve the regenerative process of the nerve fibers thorough the cut-resutured lines and formation of neuroma. These experimental animals were observed for two months, and under Nembutal general anesthesia each specimen was removed. For microscopic examination these specimens were stained with hematoxilin-eosin, Trichrom and silver staining methods. Results were as follows: 1. All animals subjected to the experiments developed sings of sciatic nerve palsy. During the observation period of two months, there were no evidence of substantial recovery of the lost function. 2. The proximal stumps of all severed nerves formed neuroma of slight to marked degree and except in two dogs the distal stumps were seen to have formed gliomas. On microscopical sections, many fibers were seen to be growing through the scartissue which occupied 1.5 cm. gap between cut ends. The distal nerve fibers underwent advanced Wallerian degeneration, as expected. 3. There were evidences of active regeneration of axons far beyond the segments, which were severed and resutured in three points at interval of one cm. However, comparing with mother fibers, regenerating daughter fibers were reduced in number and size and their architectures were disorganized, the number of daughter fibers regenerated through third sutured line was reduced to one-third that of original fibers, and the structural completion was less. It is probable that this ratio would be more reduced if the distances between transections were more farther apart, or performed in human
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