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조간대의 (潮間帶) 저서동물의 (底棲動物) 섭식행위가 (攝食行爲) 저질토 (底質土) 환경에 미치는 영향
김지식 ( Chi Shik Kim ) 한국하천호수학회 1986 생태와 환경 Vol.19 No.1·2
This experimental study was conducted to investigate how deposit-feeding Glycera decipiens and suspension-feeding Lingula unguis being macrobenthos affects the substratum of intertidal flat from July 10, 1985 to October 17, 1985. This study proved that organic matter reduced rapidly owing to deposition in the benthos-unliving environment and that the deposit-feeder restrains the reduction of the substratum more than the suspension-feeder; namely, the feeding behavior and movements of benthic animals increased the oxidation-reduction potentials of the substratum. On the other hand, it appeared that these benthic animals had little effect on the pH of the substratum. The distributional differences of fine particles come from the feeding behavior of benthic animals and Glycera decipiens promote the sandification of the substratum. The analytic values of total organic matter and total nitrogen matter appeared to be similar and Glycera decipiens promoted the denitrification of the substratum.
수종 담수어간의 (淡水魚間) 근단백 전기영동 분획의 유사성에 관한 연구
김지식 ( Ji Sik Kim ) 한국하천호수학회 1981 생태와 환경 Vol.14 No.1·2
Soluble muscle protein extracted from 9 species fresh water fish was electroph oresised with polyacrylamide gel. The percentage similarity from the electrophoresis band pattern are as followes; 1. The average percentage similarity of Microphysogobio koreensis, M. yaluensis, M. longidorsalis which belong to the same genus of Gobiobotinae appe-ared to be 81%. 2. The average percentage similarity of Hemibarbus longirostris, Gonoproktopterus mylodon and Pseudogobio esocinus which are of different genus but of similar morphological feature appeared to be 78%. 3. The average similarity of Pungtungia herzi, Pseudopungtungia tenuicorpus, Coreleucisus splendidus which are of different genus and of relatively different morphological feature represented 72%. 4. From the above-mentioned 9 species, the percentage similarity of species which is pertained to the same genus is higher than that the percentage similarity of the species with similar morphological feature in defferent genuses of the same family is a little higher of different genuses than that of species which has different morphological features.
한국산 (韓國産) 모래무지아과 어류 (魚類) 수용성 (水溶性) 근단백질의 전기영동상 (電氣泳動像)
김지식,김익수,심재환 ( Ji Sik Kim,Ik Soo Kim,Jae whan Shim ) 한국하천호수학회 1984 생태와 환경 Vol.17 No.3·4
Muscle proteins of the Korean gudgeon of the subfamily Gobioninae were investigated by the polyacrylamide gel electrophoresis to determine the relationships among the species and genera studied. The number of bands were varied between 8∼13, and the mobiltiy and density or width of staining were appeared to be specificity. Judging from the genera Pseudorasbora and Puntungia are closely related each other, but Gnathopogon and Squalidus which were previously known to be cospecific genus were conspicuously difference between them. The muscle protein electrophoretic patterns was provided to be confirmed the phyletic groups adopted for the subfamily Gobioninae by Banarescu and Nalbant in 1973.
압광 페인트를 이용한 MgO 안정화 지르코니아 소재의 급작스러운 파괴거동에 관한 실시간적 관찰연구
김지식 ( Ji Sik Kim ),손기선 ( Kee Sun Sohn ),고향진 ( Hyang Jin Koh ),이완두 ( Wan Boo Lee ) 대한금속재료학회 ( 구 대한금속학회 ) 2007 대한금속·재료학회지 Vol.45 No.5
The recently devlopoped ML(Mechano-Luminescence) technique enables macro-scale visualization of crack propagation during catastrophic failure, together with transformation zone (crack wake) in both crack front and side areas of Mg-PSZ in realistic time frame. The ML made it possible to precisely detect a relatively fast crack propagating in the speed range from 5 to 15 m/sec, thereby realizing so-called quasi-dynamic R-curve. A systematic observation of growth in wake height, as well as wake length, was made successfully in quasi-dynamic condition. Effective-toughening applied-stress intensity factor increased up to 22 MPa(m)(1/2). The h0 values obtained from the ML observation deviated significantly from that predicted by Evans-McMeeking model(J. Am. Ceram. Soc. 65,242(1982)); rahter it supports Marshall et al.`s results by interference microscopy and Raman spectroscopy (J Am. Ceram. Soc. 73,2659(1990)) in the quasi-static crack propagation. It was also mentioned that conventional R-curves spanning over several millimeters range reported for long-crack systems such as DCB(Double Cantilever Beam), CT(Compact Tension), SENB(Single Edged Notched Bar), and etc. can not be explained by Evans-McMeeking model.
논문 : 기계적 성질 ; 2 상 Ti-6Al-4V 합금의 크리프및 초소성 변형에 대한 미세조직학적 고찰
김지식 ( J. S. Kim ),김진홍 ( J. H. Kim ),박찬경 ( C. G. Park ),이종수 ( C. S. Lee ) 대한금속재료학회 ( 구 대한금속학회 ) 1998 대한금속·재료학회지 Vol.36 No.7
A study has been made to investigate the microstructural aspects of phase/grain boundary sliding and its accommodation mechanism/mode during superplastic deformation in a two phase Ti-6Al-4V alloy. Tensile tests have been carried out at 600℃ and 900℃ using specimens of 3.2 and 10.6 μm grain sizes. Deformed microstructures have been analysed by transmission electron microscopy to understand the deformation mode, accommodation mechanism, and relative sliding rate of the phase boundary and grain boundaries, In the fine grain (3.2 μm) microstructure deformed at 600℃ and 900℃, dislocations were homogeneously distributed in the α-phase with low density implying that deformation mode follows an iso-stress model. However, the coarse-grain specimens (10.6 μm) reveal the planar slip behavior in the α-phase which indicates that the deformation mode is of a mixed type between iso-stress and iso strain rate mode. It is also considered that accommodation for phase/grain boundary sliding in the α and β phase mainly results from a dislocation activated process, The generation of boundary dislocations is more concentrated along α/β phase boundaries than the α/α grain boundaries, which confirms the sliding resistance of α/β < α/ α.