회주철의 진동감쇠능과 기계적 성질에 미치는 오스템퍼링처리의 영향

백승한,김정철,손용철,한동운 한국열처리공학회 1999 熱處理工學會誌 Vol.12 No.2

Gray cast iron with a high damping capacity has been used for controlling the vibration and noise in various mechanical structures. Nevertheless, its usage has been often restricted due to its poor tensile strength. Therefore, it is necessary to improve tensile strength at the expense of a loss in damping capacity. This study is aimed at finding the best combination of tensile strength and damping capacity by varying austempering time and temperature range from 320℃ to 380℃ after austenization at 900℃ for 1hr. The effect of austempering condition on hardness and the volume fraction of retained austenite is investigated as well. The results obtained are summarized as follows : (1) With an increase in austempering temperature, both tensile strength and hardness decrease while damping capacity improves. (2) Austempering at 350℃, resulting in a mixture of upper and lower bainite with partially retained austenite, exhibits the optimum combination of tensile strength and damping capacity.

태도유형의 문제

이죽내,백지령 한국분석심리학회 1990 心性硏究 Vol.5 No.2

Fe-Mn 합금의 방진특성 및 변태특성에 미치는 냉간가공의 영향

최종술,백승한,지광구,신명철,전선우 대한금속재료학회(대한금속학회) 1999 대한금속·재료학회지 Vol.37 No.7

The objective of this study is to investigate the effect of deformation degree on damping capacity, transformation behavior and mechanical property in Fe-16%Mn-2%Cr and Fe-22%Mn alloys. The Fe-16%Mn2%Cr and Fe-22%Mn alloys undergo γ→ε→α' and γ→ε martensitic transformation by deformation, respectively. In the two alloys, the increase in degree of cold rolling cause an increase of reverse transformation temperatures of ε→γ because the dislocations introduced by cold rolling hinder the movement of γ→ε boundaries. The decrease in mobility of γ→ε boundary is responsible for a rise in driving force, raising the reverse transformation temperature. At low strain amplitudes of 1×10^(-4)∼4×10^(-4), damping capacity increases with increasing rolling degree up to 5-10%. At a high strain amplitude, the 0% rolled alloy exhibits good damping property. The results indicate that area of γ→εboundaries at a low strain amplitude is more dominant than their mobility. With a higher strain amplitude, however, mobility becomes a major factor for damping capacity.

3.6%C 회주철의 진동감쇠능 및 기계적 성질에 미치는 주입온도 및 합금원소 첨가의 영향

백승한,김정철,최종술 한국열처리공학회 2000 熱處理工學會誌 Vol.13 No.4

Flake graphite cast irons with the high damping capacity have been used for the control of vibration and noise occurring in the members of various mechanical structures under vibrating conditions. However, the damping capacity which is morphological characteristics of graphite is one of the important factors in reducing the vibration and noise, but hardly any work has deal with this problem. Therefore, the authors have examined the damping capacity of various cast irons with alloying elements and studied the influences of the matrix structures, mechanical properties and morphological characteristics of graphite. The main results obtained are as follows: Effects of pouring temperature on the damping capacities and mechanical properties were investigated in 3.6%C cast iron. At 1400℃, specific damping capacity showed the maximum value, and decreased with increase pouring temperature. Mechanical properties showed opposite trend with the damping capacity. And then, effects of Ni on the damping capacities and mechanical properties have been investigated in 3.6%C gray cast iron. At 0.2%Ni content, specific damping capacity showed the maximum value, and decreased with further increase in Ni content. Graphite length also showed same behavior. This indicates that the specific damping capacity has a close relation with graphite length. In case of Mo addition in 3.6%C-0.2%Ni cast iron, specific damping capacity and tensile strength was 27% and 20㎏f/㎟ at 3.6%C-0.2%Ni-0.3%Mo cast iron respectively.

Logos of Curse and Rescue in Absalom, Absalom!

Baik,Seok-Hyun 신영어영문학회 2011 신영어영문학 Vol.49 No.-

Baik, Seok-Hyun. Logos of Curse and Rescue in Absalom, Absalom! The New Studies of English Language & Literature 49 (2011): 65-77. The paper, regarding multiple biblical parallels that pervade the novel, aims to understand the true nature of good and evil inherent in human life that Faulkner’s characters show, and further to understand the sense of history that Faulkner wants to reveal. Sutpen with Davidic parallels shows the powerful and paternal authority of the Old South, whose career and fate reflect the contradictions that prevail in the Southern society. Indeed, the nature of his success only originates from his distorted and egocentric ambition, which exposes the evil of racism, fratricide, the contradictions of patriarchy, and also results in the inevitable collapse of the South: the divine curse upon Sutpen. His son, Charles Bon, analogous to Amnon in the Bible, is related to incest-miscegenation, which after all brings about the fratricide, destroying Sutpen’s dream of founding a dynasty, as implied by the novel’s title. And he is also used as a metaphor for a Christ Figure: a symbol of suffering, sacrifice, and love that Faulkner seeks to embody in the novel. The biblical parallels, reshaped and recreated by Faulkner in the novel, seem to warn man of his arrogances and corruptions, regarding the timelessness and universality of human history that Hebrew history shows. (Daeshin University)

The diagnosis of coronoid impingement using computed tomography

Baik, Jee-Seon,Huh, Kyung-Hoe,Park, Kwan-Soo,Park, Moo-Soon,Heo, Min-Suk,Lee, Sam-Sun,,Choi, Soon-Chul 대한구강악안면방사선학회 2005 Imaging Science in Dentistry Vol.35 No.4

Coronoid impingement can cause limitation of mouth opening. In many cases, it appears to be related to the coronoid hyperplasia. We present a case of mouth opening limitation caused by coronoid impingement on the posterior surface of the zygomatic bone without coronoid hyperplasia. The bony changes in coronoid and zygoma including surface irregularity and discontinuity of the cortex and sclerotic change of inner medullary space were noted on computed tomography (CT) scans in different level of axial planes. Through another CT scans in open mouth position could demonstrate that those bony changes were caused by the contact of both surfaces against each other. In case coronoid impingement is suspected of the many possible causes, the open mouth CT scans will be needed to reveal the direct impingement of coronoid on zygoma even without coronoid hyperplasia.

Cytoreductive surgery with hyperthermic intraperitoneal chemotherapy in management of peritoneal carcinomatosis: Single center experience in Korea

Hee Ju Lee1,HyungJoo Baik1,박요한,서상혁,김광희,Ki Beom Bae,Kwan Hee Hong,김기향,변정미,Dae Hoon Jeong,Kyung Bok Lee,오민경,조광래,안민성 대한종양외과학회 2019 Korean Journal of Clinical Oncology Vol.15 No.2

Purpose: Peritoneal carcinomatosis (PC) has been considered a terminal condition and cytoreductive surgery with hyperthermic intraperitoneal chemotherapy (CRS/HIEPC) is regarded as an alternative therapeutic option. This study aimed to evaluate the 30-day clinical outcomes of CRS/HIPEC and the feasibility of the surgery by investigating the morbidity and mortality in Inje University Hospital. Methods: Data were retrospectively collected from 19 patients with PC who underwent CRS/HIPEC at Inje University Hospital in 2018. We evaluated pre-, intra-operative parameters and postoperative clinical outcomes and early complications. Results: The mean operating time was 506.95 minutes and the mean blood loss was 837.11 mL. Six cases (31.58%) had morbidity of grade III or above. A longer operating time (≥560 minutes, P=0.038) and large blood loss (≥700 mL, P=0.060) were positively correlated with grade III or worse postoperative complications. Conclusion: Our early experience with CRS/HIPEC resulted in a 31.58% morbidity rate of grade III and above, with risk factors being longer operating time and greater intraoperative blood loss. As the surgical team’s skills improve, a shorter operating time with less intraoperative blood loss could result in better short-term outcomes of CRS/HIPEC.

갑상설관 누공 2예

백승철 ( Seung Churl Baik ),조백기 ( Baik Kee Cho ),김정원 ( Chung Won Kim ),이백권 ( Baik Keun Lee ) 대한피부과학회 1995 대한피부과학회지 Vol.33 No.3

Thyroglossal duct cysts result from failure to obliterate the embryonic throglossal duct. When these cysts drain through the skin, they produce thyroglossal duct fistulas, which re often infected. We report two cases of thyroglossal duct fistula in an 8-year-old boaid a 41-year-old man who had a infected cystic mass and sirius on the anterior midline neck, respeticely. The cyst which is lined by a columnar epithelium was identified microscopically in a surgically n se ted specimen. (Kor J Dermatol 1995;33(3): 510-519)

Effect of Verapamil on the Specific Activity of Na-K-activated Adenosine Triphosphatase in Rabit Renal Medulla

Park, Jung Ran,Baik, Haing Woon,Baik, Hyung Hwan,Cho, Yong Ho 慶熙大學校 醫科大學 1990 慶熙 醫大 論文集 Vol.15 No.1

Adhesion and differentiation of human mesenchymal stem cells on plasma-functionalized graphenes with different feeding gases

Baik, K.Y.,Choi, J.,Gwon, H.,Cho, J.,Kim, Y.K.,Attri, P.,Kim, U.J.,Jung, R. Pergamon Press ; Elsevier Science Ltd 2014 Carbon Vol.77 No.-

Surface functionalisation of graphene layer has been investigated to improve the efficiencies in bio-applications such as stem cell differentiation or protein sensing. Plasma treatment can induce various functionalities on graphene surface simply by changing feeding gas. In this study, the surface chemistry of graphene is modified by plasma treatment using three different feeding gases of H<SUB>2</SUB>, N<SUB>2</SUB>, and O<SUB>2</SUB>. The effects of differential functionalisation are examined by the adsorption of fibronectin and the adhesion, proliferation, and differentiation of human mesenchymal stem cells. Fibronection adsorption is enhanced on the N<SUB>2</SUB> plasma-treated graphene, but it is not clear on the others. hMSCs adhesion is broadened on all of the plasma-treated graphene substrates, especially on the N<SUB>2</SUB> plasma-treated one. H<SUB>2</SUB> plasma treatment enhances cell proliferation and osteogenic differentiation, and N<SUB>2</SUB> and O<SUB>2</SUB> plasma treatments show a tendency of heterogeneous differentiation to osteoblasts and myoblasts. Different responses of stem cell adhesion, proliferation, and differentiation depending on the plasma-treated graphene surface indicate the importance of highly specific surface functionality in stem cell engineering.