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열간공구강 DH32 소재의 열간단조품 개발에 관한 연구
장진형,김현수,김종현,김현필,김용조,Jang, Jin-Hyung,Kim, Hyun-Su,Kim, Jong-Hyeon,Kim, Hyun-Pil,Kim, Young-Jo 한국금형공학회 2012 한국금형공학회지 Vol.6 No.1
Hot tool steel, in general, has not been used as a material in hot forging. However such a hot tool steel is recently applied to forging materials by recent forging technology. DH32 is known as a kind of hot tool steels, which is developed for characteristics of excellent strength and toughness in high temperature. Feasibility of DH32 to hot forging material has been researched to develop the hot forging technology of a plunger used for a large-sized marine fuel pump. Hot compression experimental works were performed to investigate the hot strain characteristic of DH32 and with the experimental results FE simulations were also conducted for the design of forging processes and preform. It is found out through the hot compression experimental works that DH32 has a hot brittleness at more than $1150^{\circ}C$.
장진형(Jang, Jin Hyoung) 한국국제회계학회 2014 국제회계연구 Vol.0 No.56
본 연구에서는 충실한 회계학교육에 이바지하고자 개정상법 총칙편의 상업장부와 회사편 주식회사의 회사의 회계에 대하여 고찰하였다. 그 결과 다음과 같은 사항을 발견할 수 있었다. 첫째, 상인은 상업장부를 폐쇄한 날로부터 기산하여 10년간 보존하여야 한다. 둘째, 회계기준과의 괴리를 없애기 위해 회사의 회계는 일반적으로 공정‧타당한 회계관행을 따른다. 셋째, 대차대조표를 가장 중요한 회계보고서로 보고 있다. 넷째, 자본의 충실화를 기하기 위해 준비금의 적립을 강제하고 있다. 다섯째, 회사재산이 사외로 유출되는 이익배당에 관해 엄격한 요건을 적용하고 있으며, 현물출자를 허용하고 있다. 여섯째, 소수주주에 대하여 검사인선임청구권을 인정하고 있다. 마지막으로 회계업무와 관련된 벌칙에는 행정벌은 물론 형벌도 있다. 본 연구에 의해 회계학도들이 회계와 관련된 상법의 회계규정을 숙지함으로써 실행가능한 회계지식을 갖출 수 있을 것으로 본다. To make the contents of accounting education rich, I considered the accounting provisions in Revised Commercial Act. As a result, my findings are as follows. First, every merchant shall preserve trade books and important documents relating to business for a period of ten years. Second, in order to remove the gap between corporate accounting standards and Commercial Act, the accounting of a company, other than that provided for in this Act and Presidential Decree, shall be conducted in accordance with generally accepted fair and proper accounting practices. Third, balance sheet is the most important accounting report. Forth, for the purpose of the capital enrichment, a company shall accumulate, as its earned surplus reserve, at least 10 percent of the cash dividend in each period for the settlement of accounts until its reserve reaches half of the company"s capital. Fifth, dividends which cause company"s assets outflow are subject to rigorous standards, and dividend in kind is allowed. Sixth, under certain conditions, any shareholder who holds shares representing no less than three percent of the total issued and outstanding shares may request the court to appoint an inspector to investigate the affairs of the company and the status of its assets. Finally there are punishments as well as administrative punishments in penal provisions related to accounting affairs. Knowing the accounting provisions in Revised Commercial Act by this study, accounting students will get more practicable accounting knowledge.
장진형(Jin-Hyung Jang),홍은기(Eun-Kee Hong),황광원(Kwang-Won Hwang),윤린(Rin Yun) 대한기계학회 2010 大韓機械學會論文集B Vol.34 No.5
발전설비 내 공기예열기는 보일러 연소가스로부터 열을 회수하여 유효열의 손실을 감소시킴으로서 보일러의 열효율을 높이기 위해 설치된다. 본 연구에서는 계획예방정비가 공기예열기의 성능에 미치는 영향을 고찰하였다. 공기예열기의 성능지표들은 공기예열기의 계획예방정비 전후의 운전 상태와 성능변화 모두를 고려하여 계산되었고, 공기예열기의 중요한 성능지표로는 가스 측 온도효율, 공기누설률, 열회수율, 열관류율과 열용량비들이다. 계획예방정비 전후의 공기예열기 성능평가로부터 공기예열기의 모든 성능 지표가 계획예방 정비 후 향상되었다. Air heater used in power plant helps increase the thermal efficiency of the boiler by recovering the heat from the boiler flue gas and thus preventing the loss of useful heat. This study investigates the effect of preventive maintenance on the performance of the air heater in a power plant. Performance indexes for the air heater are calculated to observe the changes in the performance and operation status of the air heater before and after preventive maintenance. The major performance indexes considered are temperature efficiency of the flue gas side, air leakage rate, heat recovery rate, heat transmission rate, and heat capacity ratio. The performance of the air heater is evaluated before and after preventive maintenance; our results show that all the abovementioned performance indexes are improved after the maintenance.
패쇄성 황달을 동반한 간흡충 감염증에 있어서 내시경적 유두절개술의 의의
윤형신(Hyeong Shin Yoon),김연종(Yeon Jong Kim),김호동(Hou Dong Kim),장진형(JIn Hyeong Jang),임연근(Yeun Keun Lim),여향순(Hyang Soon Yeo),박홍배(Hong Bae Park) 대한내과학회 1992 대한내과학회지 Vol.43 No.6
Background: Clonorchiasis is very common in the Far East, especially southern China, Taiwan, Hong Kong, Japan, and Korea, where raw or undercooked fish has long been considered a delicacy. In Korea, people who live in the vicinity of the major four rivers are most frequently infected. 3ome percentage of infected individuals will develop the symptoms of chronic clonorchiasis, which include inflammation, infection, stones, obstruction, and neoplastic changes in the biliary tree. Methods: To evaluate the effects of EST in clonorchiasis patients with obstructive jaundice, 73 patients underwent EST as a method of biliary drainage after praziquantel therapy between August 1989 and July 1991. All of the patients were diagnosed as having clonorchiasis by the stool examination and ERCP and as having obstructive jaundice according to their blood chemistry findings. Results: (pt.; patient) 1) 73 patients, 54 male (74%) and 19 female (26%), underwent EST 1.14 times in average (from 1 to 3 times). 2) The associated diseases of the patients at presentation were biliary stones (22 pt., 30%), pancreatitis (16 pt., 22%), biliary tumors (8 pt., 11%) and liver cirrhosis (5 pt., 7%). 3) AST, ALT, alkaline phosphatase and direct and total serum bilirubin were significantly improved in 32 patients (44%) within 1 week after EST and 63 patients (86%) within 4 weeks after EST (p<.0.01). 4) 10 patients (14%) with biliary tumors (5 pt., 7%), liver cirrhosis (4 pt., 5%) and CBD stone (1 pt., 1%) were not improved in their blood chemistry. 5) Complications (9 pt., 12%) were acute pancreatitis (6 pt., 8%), major bleeding (2 pt., 3%) and acute cholangitis (1 pt., 1%). Conclusion: EST is the very effective, convenient, safe and non-surgical method of biliary drainage in clonorchiasis patients with obstructive jaundice. But it is of little value in most of the patients with biliary tumors and liver cirrhosis.