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      • 絹絲 LOUSINESS에 對한 硏究 (Ⅱ)

        崔炳熙,金洛禎,朴光義,南重熙 서울대학교 1964 서울대학교 論文集 Vol.15 No.-

        This treatise was carried out to study the heredity phenomenon of silk lousiness and the interaction of genes related with silk lousiness. It was also studied how to improve the silk lousiness of general raw silk by refining process because the mutational or selective process was found as unsatisfactory method. The conclusion reached were as follows. A. Conclusions related with genetic problem. 1. The decreased effects of the lousiness were 11% in the F₁hybrids. 2. Lousiness was considered to inherit as the incomplete dominance. 3. The effects of the lousiness gene were additive, and the lousiness of raw silk might be influenced by more than two genes. 4. The quantitative characters of cocoons were not genetically correlated with the occurance of lousiness. 5. Lousiness could not be said to occur more in the heavy-cocoon strains. 6. The microscopic lousiness test of this paper showed the same result of the international exforiation test. B. Conclusions related with lousiness improvement. 1. Raw silk was able to refine by the employment of 0.2% cationic softener solution for 30 minutes at 95℃ refining bath without the occurance of lousiness. 2. Anionic chemical softener was not available for silk refining process. 3. The above cationic softener refining process did not cause any physical defect for the silk fiber. 4. Soap refining process caused silk lousiness easily.

      • KCI등재후보

        MM-ALE 유한요소 시뮬레이션을 이용한 수중 어뢰폭발에서의 최악파편의 종단속도 추정

        최병희,류창하 대한화약발파공학회 2019 화약발파 Vol.37 No.3

        This paper was prepared to investigate the behavior of fragments in underwater torpedo explosion beneath a frigate or surface ship by using an explicit finite element analysis. In this study, a fluid-structure interaction (FSI) methodology, called the multi-material arbitrary Lagrangian-Eulerian (MM-ALE) approach in LS-DYNA, was employed to obtain the responses of the torpedo fragments and frigate hull to the explosion. The Euler models for the analysis were comprised of air, water, and explosive, while the Lagrange models consisted of the fragment and the hull. The focus of this modeling was to examine whether a worst-case fragment could penetrate the frigate hull located close (4.5 m) to the exploding torpedo. The simulation was performed in two separate steps. At first, with the assumption that the expanding skin of the torpedo had been torn apart by consuming 30% of the explosive energy, the initial velocity of the worst-case fragment was sought based on a well-known experimental result concerning the fragment velocity in underwater bomb explosion. Then, the terminal velocity of the worst-case fragment that is expected to occur before the fragment hit the frigate hull was sought in the second step. Under the given conditions, the possible initial velocities of the worst-case fragment were found to be very fast (400 and 1000 m/s). But, the velocity difference between the fragment and the hull was merely 4 m/s at the instant of collision. This result was likely to be due to both the tremendous drag force exerted by the water and the non-failure condition given to the frigate hull. Anyway, at least under the given conditions, it is thought that the worst-case fragment seldom penetrate the frigate hull because there is no significant velocity difference between them. 본 논문은 명시적 유한요소 해석을 이용하여 군함이나 수상함 아래의 수중에서 어뢰가 폭발할 때의 파편들의 거동을 조사하기 위하여 작성되었다. 본 연구에서는 LS-DYNA에서 라그랑주-오일러 (ALE) 접근법이라 불리는 유체-구조물 상호작용(FSI) 기법을 적용하여 어뢰파편과 선체의 응답을 관찰하였다. 오일러 모델은 공기, 물, 폭약으로 구성되며, 라그랑주 모델은 파편과 선체로 이루어져 있다. 본 모델링의 핵심은 최악파편이 어뢰로부터가까운 곳(4.5 m)에 위치한 선체에 파공을 일으킬 수 있는지 여부를 파악하는 데 있다. 시뮬레이션은 별도의 두단계로 수행되었다. 첫 번째의 예비해석에서는 팽창하는 어뢰의 외피가 찢어지는 데 폭약에너지의 30%가 소모된다는 가정 하에 수중폭발 시의 파편속도에 대해 잘 알려져 있는 실험결과를 토대로 최악파편의 초기속도를 결정하였다. 두 번째의 총괄해석에서는 최악파편이 선체에 부딪치기 직전에 보일 것으로 예상되는 파편의 종단속도를찾고자 하였다. 그 결과, 주어진 조건 하에서 최악파편의 초기속도는 매우 빠른 것으로 나타났다(400 및 1000 m/s). 하지만 충돌이 발생할 때의 파편과 선체 간의 속도차이는 불과 4 m/s 정도로 매우 작았다. 이 결과는 물에의한 큰 항력의 영향도 있지만 선체에 부여한 비파괴 조건도 영향을 끼쳤을 것으로 보인다. 하지만 적어도 본 논문에서 가정한 해석조건 하에서는 최악파편의 느린 상대속도로 인하여 선체에 파공이 발생하기는 어려운 것으로나타났다.

      • 잔류응력을 고려한 SS400재의 피로특성에 관한 연구

        최병희,이종범,정장만,장경천,최병기 朝鮮大學校 機械技術硏究所 2007 機械技術硏究 Vol.10 No.2

        In this study is about the fatigue characteristics which appears in the welding residual stress field. The welding residual stress takes place mostly at the portion where SS400 materials are automatical welded. The effects of the welding residual stress in the growth and propagation of fatigue crack, so as to study the fatigue behavior in the welding residual stress field. The results, in case of the load range is constant, as the stress ratio is changing to 0.1, 0.33. 0.5 the propagation life is constant but the growth life decreases. And than, when maximum load or minimum load is constant, as the stress ratio increases the growth life and propagation life increase. The fatigue crack propagations rate da/dN appears to accelerate when the stress intensity factor range △K is less than 15MPa-m^(1/2). The growing and propagation fatigue crack in the welding residual stress field is similar to original specimen after being passed the original residual stress field.

      • KCI등재

        자동차용 에어벤트 덕트바디 성능 개선에 관한 연구

        최병희,유재용,김정호 조선대학교 공학기술연구원 2019 공학기술논문지 Vol.12 No.2

        In this study, a integral type air vent duct body was proposed and flow analysis of injection molding using FEM was performed to improve performance deterioration caused by leakage defect of air vent duct body for automobile. The integral type of air vent duct body was developed in a new shape to be applied to new vehicles in domestic automobile manufacturing company. The leakage test was performed for performance evaluation and the flow analysis of injection molding was performed for new product. The proposed integral type air vent duct body was possible to eliminate the product defects caused by leakage in air vent duct body joint and to optimize the product injection molding process and to make multi product injection molding by the flow analysis. In addition, it was possible to provide application data for predicting feasibility of newly developed products and securing reliability

      • KCI등재

        의사.한의사 복수면허자의 특성 및 근무현황에 대한 조사 연구

        최병희,한경연,임병묵,정민정,윤영주,Choi,,Byung-Hee,Han,,Gyung-Yeon,Lim,,Byung-Mook,Jeong,,Min-Jeong,Yun,,Young-Ju 대한예방한의학회 2011 대한예방한의학회지 Vol.15 No.1

        Objectives : This study was performed to investigate the status of dual medical license holders who have both the medical doctor (MD) and the Korean medicine doctor (KMD) license in Korea, and provide basic data for developing the cooperational strategy between conventional western medicine and traditional Korean medicine. Methods : The questionnaires on the general characteristics and working status were developed and administered for both dual license holders and medical students with MD or KMD license. The data of 187 persons were collected and analyzed. Results : Mean age of dual medical license holders is $42.28{\pm}6.54$ and most of them are male(86.0%). 75.2% of them obtained MD license first. However among the students who had MD or KMD license, 73.7% had KMD license. The mean time for obtaining the additional license was $10.11{\pm}4.905$ year. Forty nine dual license holders are opening both medical clinic and Korean medicine clinic. Conclusions : To promote the role of dual license holders for collaborating traditional Korean medicine and western medicine, developing an integrative medical curriculum should be enhanced, and the studies investigating the practice characteristics, and self-consciousness of dual license holders are required.

      • KCI등재

        Measurement of tensile strength of brittle rocks using a half ring shaped specimen

        최병희,이연규,박철환,류창하,박찬 한국지질과학협의회 2019 Geosciences Journal Vol.23 No.4

        A tensile test using a half ring (HR) shaped specimen is attempted for the determination of the tensile strength of rock materials. The HR test is a 3-point bend test similar to the semicircular bend (SCB) test. However, the HR specimen is a curved prismatic bar. The theoretical tensile strength of this special bar can be obtained by an analytical formula derived from a basic theory of strength of materials. Owing to the eccentricity of the HR specimen, the possibility for a single tensile fracture to begin at the intended location can increase. This may give results that are more accurate than the conventional bending tests. In this paper, after the concept and formula of the HR test are introduced, its applicability to brittle rocks is investigated by FEM simulations and laboratory tests. In the processes, the theories of the Brazilian test and a special SCB test, which is an alternative to the Brazilian test, are used to examine the accuracy of the HR test.

      • 순수 Ti 용접재의 기계적 특성 및 피로크랙 성장특성에 관한 연구

        최병희,이종범,정장만,장경천,최병기 朝鮮大學校 機械技術硏究所 2007 機械技術硏究 Vol.10 No.2

        In this study, fatigue fracture often occurs due to the fatigue crack in the machine and welding structure and this is the result of severe operational environment, operational condition, and design condition caused by the large scaled and light weighted machine and structure in recent days. Therefore, safety and reliability should be secured to prevent the fatigue fracture of machine and structure, and the use of titanium has been increased in the metal material for the safety and reliability. The purpose of this thesis was to investigate the welding characteristics and fatigue crack growth characteristics of titanium, commonly using power station, aircraft and ship. The experimented material was TIG welded in order to look over the characteristics according to the notch position and compare with other material. The results, at the same welding condition, 4 pass specimen which had the smallest number of welding pass had the highest tensile strength with 51kgf/㎟ and the tensile strength of 4 pass specimen was 10% higher than the one of 7 pass specimen, and its elongation reduced about 30%. The initial fatigue crack growth characteristic is slower in this order, boundary zone < welding zone < HAZ < base metal. Especially boundary zone's growth speed is slower about 30 times than base metals.

      • 製絲機 繰絲速度의 理論 處理

        崔炳熙 서울대학교 1961 서울대학교 論文集 Vol.10 No.-

        The theoretical treatment is give in this paper for longitudinal impact of silk yarn or raw silk yarn leads to a formula for the limiting breaking velocity. Because of periodical impact nature during the silk reeling process, this kind of studies are required for the safty operation of it. The limiting velocity of the reeling process is derived as 300 meters per minute with theoretical study. The theoretical treatment also leads to formulas for obtaining energy to any given stain. including rupture strain under different impact conditions so that the theoretical energy amount may be figured and designed with the automatic motion which is attached in the kennel system of the silk reeling machine. Meantine. a theoretical study of potential energy is mintioned to cause pressure on the winding reel during the reeling process.

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