일본산 (日本産) 모시목의 (毛翅目) 연구

김재원 ( Jae Won Kim ) 한국하천호수학회 1974 생태와 환경 Vol.7 No.3·4

Studies on aquatic insects along the river in Oo Ma Da Mountain Stream in Yo Shi No Gun of Nara, Japan. It had been studied from April in 1973 to April in 1974 by Jae Won, KIM. teacher of biology at Po Sung high school in Seoul, Korea. Of the sample of aquatic insects, the Larvae and pupa and adults belonging to Trichoptera were 65 species and following species were unrecorded by the other authors up to the present. 1. Rhyacphila sp. RJ(Larvae: new mention species) 2. Adults of Rhyacophila sp. RJ are Rhyacophila kuwamurae TSUDA. 3. Adults of Rhyacophila sp. RG are Rhyacophila impar MARTYNOV. syn. Rhyacopthila tacita TSUDA. 4. Adults of Rhyacophila sp. RI are Rhyacophila kisoensis TSUDA. 5, I have known Genitalia sturucture from pupa of Neophilax sp. NC. 6. Apatania sp. AB(Larvae: newly mentioned species) 7. I have known Genitalia structure from pupa of Branchycentrus sp. BB 8. I have known Genitalia structure from female and male pupa of Arctopsyche sp. AB. 9. Moropsyche sp. MA.(Larvae: newly mentioned species), and its Genitalia structure are known. by pupa and adults. I wish to express my deepest thanks to Prof. Matsunae TSUDA of Zoological Institute, Nara women`s University and all other Japanese who have helped me.

수용액 매체로부터 코디어라이트 졸의 제조 및 코디어라이트 세라믹스의 소결거동

김재원,김현철,김두현,서성문,조창용,최승주,김재철,Kim, Jae-Won,Kim, Hyeon-Cheol,Kim, Du-Hyeon,Seo, Seong-Mun,Jo, Chang-Yong,Choe, Seung-Ju,Kim, Jae-Cheol 한국재료학회 2000 한국재료학회지 Vol.10 No.3

In order to fabricate dense cordierite ceramics without sintering aid, thermal behavior of Mg-Al-Si compounds during sintering was investigated. The dispersibility of cordierite suspension in aqueous media was measured by ESA(electrokinetic sonic amplitude). To prevent aggregation and insufficient dispersion of the cordierite sol, the pH of the suspension was controlled to 1.03 and 8.30 by adding $2N\;HNO_3$ and $2N\;NH_4OH$, respectively. Magnesium-aluminum-silicate complex gel coexisted in the specimen which has been gelled at $150^{\circ}C$ fir 12 hours, however several metastable phase such as ${\mu}-cordierite(Mg_2Al_4Si_5O_{18}),\;spine(MgAl_2O_4)\;and\;mullite(Al_6Si_2O_{13})$ existed below $1300^{\circ}C$ Nucleation rates of the two suspension were similar, but densification of the gel was sensitive to the pH of the sol. Densification of the sol with the pH of 8.3 was more pronounced than that of the sol with pH of 1.63.

신발 유형과 행동 과제에 따른 보행 속도 분석

김재원,조연하,이선엽,이무렬,김소정,김진아,Kim, Jae-Won,Jo, Yeon-Ha,Lee, Sun-Yeop,Lee, Mu-Ryeol,Kim, So-Jeong,Kim, Jin-A 한국임상보건과학회 2017 한국임상보건과학회지 Vol.5 No.4

Purpose. Walking depends on the speed and type of shoe to be worn, and the degree of impact varies with the muscle used. In addition, the speed can be changed by moving objects and using objects when walking. This study analyzed the change of walking speed by applying various factors influencing walking. Methods. A total of 60 patients who had not undergone musculoskeletal diseases during the last 1 year were included. Shoe type was divided into slippers and shoe heels. Behavioral types were divided into bagging, books, and cell phone use. The walking speed was measured by the general walking, the middle walking, and the fast walking. The time was measured using a 10M linear distance test. The collected data were analyzed with SPSS program for independent samples t-test, one-way ANOVA. Results. There was a statistically significant difference according to the type of shoes when walking. Walking speed was slow in shoe heel. In addition, There was statistically significant difference according to type of behavior task at walking. Walking speed was slow in task type using mobile phone during walking. Conclusions. The walking speed were appeared difference in each type of shoe heel, using mobile phone.

수용액 매체에서 젤-케스팅 공정을 이용한 세라믹 코어 제조에 관한 연구(I) : 다성분계 분산 세라믹 슬립의 젤화 거동

김재원,김두현,김인수,유영수,김재철,조창용,Kim, Jae-Won,Kim, Du-Hyeon,Kim, In-Su,Yu, Yeong-Su,Kim, Jae-Cheol,Jo, Chang-Yong 한국재료학회 2001 한국재료학회지 Vol.11 No.2

A new process, gelcasting in aqueous medium, to fabricate complex-shaped ceramic core has investigated. The ceramic slurry, mixture of fused silica powder and additives such as zircon and cordierite, was electrosterically stabilizes. The slip was prepared by ball milling of polydispered ceramic suspension with monomer, dimer and dispersant. The rheological behavior of slip was evaluated by viscosity measurement. It was found that the high solid loading of polydispersed ceramic slip, which has low viscosity of 50vol%, is possible to obtained. The viscosity of the slip was significantly dependent upon the amount of polymer dispersant and the formulation of monomer and dimer. The green bodies were fabricated through casting and gelation at room temperature followed by drying at $25^{\circ}C$ for 48hrs under relative humidity of 80~85%. Crack-free green body was successfully fabricated through the above process.

정밀주조용 쉘 몰드에 알루미노실리케이트계 졸의 응용에 관한 연구 ( I )

김재원,김두현,서성문,조창용,최승주,김재철,박영규,Kim, Jae-Won,Kim, Du-Hyeon,Seo, Seong-Mun,Jo, Chang-Yong,Choe, Seung-Ju,Kim, Jae-Cheol,Park, Yeong-Gyu 한국재료학회 1999 한국재료학회지 Vol.9 No.12

The effect of aluminosilicate sol on the formation of mullite layer in zircon shell mold was investigated. Aluminosilicate sol was prepared by mixing of colloidal silica(NALCO(R) 1130) and an aqueous solution of aluminium nitrate at room temperature. The sol gelled at 50$^{\circ}C$ for 48 hrs. It was identified that the gel consists of aluminosilicate complexes and gibbsite. The coordination number of all aluminium ion bonded with silicon ion was four. Mullite phase formed by sintering above 1300$^{\circ}C$. XRD peak of mullite sharpened with increasing sintering temperature and the content of aluminium nitrate. Mullite phase displayed whisker-like 0.5~5${\mu}m $ particles. Separation between 1st and 3rd layers during sintering and the difference in thermal expansion coefficient between residual silica and mullite.

Al 첨가에 따른 소성중 쉘 몰드의 뮬라이트화 거동

김재원,김두현,서성문,조창용,김주량,최승주,Kim, Jae-Won,Kim, Du-Hyeon,Seo, Seong-Mun,Jo, Chang-Yong,Kim, Ju-Ryang,Choe, Seung-Ju 한국재료학회 1999 한국재료학회지 Vol.9 No.8

The efect of A1 addition and sintering condition on mutization behavior between alumina and silica in alumina-based shell mold was investigated. A1 addition and high sintering temperature increased the degree of mullitization between alumina/silica but decreased the room temperature strentgh of the shell molds. It was identified that the sintered strength of the shell molds was in range of 2.0~2.6kg/$\textrm{mm}^2$. Al addition suppressed deflection of the shell molds at high temperature. Especially, no deflection was observed in the specimen which was sintered at $1000^{\circ}C$ for 1hr with 2.5wt% Al. The specimen sintered at $1500^{\circ}C$ for 4hrs with no Al addition also displayed no deflection.

율곡 이이(李珥)의 삶에 나타난 가치관과 효정론(孝情論) - 주로 유·소년기를 중심으로 -

김재원 ( Kim Jae-won ) 한국사상문화학회 2017 한국사상과 문화 Vol.90 No.-

Yulgok was the most humane basis as a preacher of Saimdang(師任堂). At the age of three, he learned to learn words, and when he was 5 years old, he was known to be a natural Hyoja(孝子). At the age of six, he instructed Confucian scriptures from his mother and awakened him to Chinese. At the age of seven, he wrote ‘Jinbokchangjeon(陳復昌傳)’ and then ‘Faseokjungsi(花石亭詩)’. At the age of nine, he read the ‘Eryunhangsildo(二倫行實圖)’ and painted ‘Bongbumohyungjedo(奉父母兄弟圖)’. When his father, Lee Won-soo(李元秀), at the age of 11, was ill, he went to his maternal grandfather's temple and prayed to the spirit. He wanted to change the life of his old and miserable father to his own young life. As if there is a saying, “Heavenly willingness will impress the heavens(至誠感天)”, a spirit inspired by Yulgok’s Hyosung appeared. “I have a long son. This child will become a ‘Great Confucian of the East’ in the future and should be raised well. And if the day shall come to pass in the morning, make it ‘Ei(珥)’ your name, and it shall be on the next day, and your father 's sickness shall be cleansed. The people of the Yulgok family gave thanks to the spirit and spent hopeful days. Yulgok worked for his parents and worked hard. At the age of thirteen, he passed the first grade to ‘Jinsachosi(進士初試)’. It was a surprise. But his mother, whom he respected at the age of sixteen, suddenly died. After three years, He became an adult, but he could not find his heart stable enough. When this uneasy mind could not be restrained, He went to Bongeunsa(奉恩寺) Temple in Gangnam(江南), read Buddhist books, went to Mt. Geumgang(金剛山) and rebelled against Buddhism.

접합 공정 조건이 Al-Al 접합의 계면접착에너지에 미치는 영향

김재원,정명혁,장은정,박성철,김성동,박영배,Kim, Jae-Won,Jeong, Myeong-Hyeok,Jang, Eun-Jung,Park, Sung-Cheol,Cakmak, Erkan,Kim, Bi-Oh,Matthias, Thorsten,Kim, Sung-Dong,Park, Young-Bae 한국재료학회 2010 한국재료학회지 Vol.20 No.6

3-D IC integration enables the smallest form factor and highest performance due to the shortest and most plentiful interconnects between chips. Direct metal bonding has several advantages over the solder-based bonding, including lower electrical resistivity, better electromigration resistance and more reduced interconnect RC delay, while high process temperature is one of the major bottlenecks of metal direct bonding because it can negatively influence device reliability and manufacturing yield. We performed quantitative analyses of the interfacial properties of Al-Al bonds with varying process parameters, bonding temperature, bonding time, and bonding environment. A 4-point bending method was used to measure the interfacial adhesion energy. The quantitative interfacial adhesion energy measured by a 4-point bending test shows 1.33, 2.25, and $6.44\;J/m^2$ for 400, 450, and $500^{\circ}C$, respectively, in a $N_2$ atmosphere. Increasing the bonding time from 1 to 4 hrs enhanced the interfacial fracture toughness while the effects of forming gas were negligible, which were correlated to the bonding interface analysis results. XPS depth analysis results on the delaminated interfaces showed that the relative area fraction of aluminum oxide to the pure aluminum phase near the bonding surfaces match well the variations of interfacial adhesion energies with bonding process conditions.

수용액 매체에서 젤-케스팅 공정을 이용한 세라믹 코어 제조에 관한 연구(II) : 세라믹 코어 소결체의 물성

김재원,김두현,김인수,유영수,최백규,김의환,조창용,Kim, Jae-Won,Kim, Du-Hyeon,Kim, In-Su,Yu, Yeong-Su,Choe, Baek-Gyu,Kim, Ui-Hwan,Jo, Chang-Yong 한국재료학회 2001 한국재료학회지 Vol.11 No.6

The effect of sintering condition on the mechanical properties and leachability of polydispersed ceramic core body made by gel-casting process in aqueous medium have been investigated. The polydispersed ceramic slip that has low viscosity($\leq$1000cP, at 1000cP (at $50sec^{-1}$ ) and high solid loading(50vo1%) was obtained. The green bodies were fabricated through casting and gelation at room temperature followed by drying at $25^{\circ}C$for 48hrs under relative humidity of 80%. Crack-free green body was successfully fabricated through the above process. The strength at room temperature, apparent bulk density, and shrinkage of the ceramic core body increased propotionally with increasing sintering temperature(1100~150$0^{\circ}C$). However, porosity of the ceramic core body showed relatively low vague. Leaching rate of sintered core body increased with increasing porosity of the sintered body, and was significantly dependent upon the concentration of alkali caustic solution at the same leaching temperature.

실리카 바인더 함량과 소결조건이 지르콘계 주형의 강도에 미치는 영향

김재원,김두현,김인수,서성문,조해용,김두수,조창용,최승주,Kim, Jae-Won,Kim, Du-Hyeon,Kim, In-Su,Seo, Seong-Mun,Jo, Hae-Yong,Kim, Du-Su,Jo, Chang-Yong,Choe, Seung-Ju 한국재료학회 2000 한국재료학회지 Vol.10 No.6

The effect of silica binder content on the mechanical properties of zircon shell mold was investigated. Content of binder silica sol to refractory powder in weight[$R_W$] was adjusted from 0.18 to 0.43. Sintering of the shell mold was carried out in the temperature range of $871^{\circ}C$ to $1400^{\circ}C$. Green strength of the shell mold at room temperature increased with increasing $R_W$ and sintering temperature up to $1300^{\circ}C$. However, the mold with $R_W$ of 0.43 that sintered at $1400^{\circ}C$ for 3 hours showed relatively low strength and large level of porosity. The mechanical behavior of the shells is supposed to attributed to the difference in thermal expansion coefficient between refractory powder and binder silica. The optimum value of $R_W$ for zircon-based shell molds was found to be 0.33.