Prediction of Retained Austenite Fraction in Quenching-and-Partitioning (Q&P) Steels Using the Gibbs Energy Balance Approach

Seong Hoon Kim,Ji Hoon Kim,Jae Hoon Lee,Dong‑Woo Suh,Jae Sang Lee 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.9

Prediction of retained austenite fraction is quite important in designing advanced high strength steels since retained austeniteis the source of transformation-induced plasticity. The present study investigates the phase constitution of a medium-carbonQ&P steel by comparing various approaches to the transformation stasis of bainitic ferrite and applying them to the partitioningprocess. Among them, the modified GEB approach gave the best agreement with the experimental observation, includingthe effects of heat-treatment condition and chemical composition on phase constitution. This indicates phase transformationduring partitioning can be effectively described by the physics of Gibbs energy balance approach.

부산 신평·장림공단지역의 대기오염물질 배출 특성

김상헌,정장표,김영태,조성훈 慶星大學校 環境問題硏究所 1995 環境硏報 Vol.5 No.1

Industrial growth and urban gravitation of the population etc. have seriously deteriorated the air quality which has adverse effect on human health and property, and the situation is more serious in industrial complex as well. Therefore, it is necessary to examine the pollutants emissions inventory to establish proper and comprehensive strategies for the reduction of pollutant levels. This study is aimed at investigating the characteristics of the pollutant emissions in the vicinity of Sinpyeung·Jangrim industrial complex in Pusan. The emission quantities of air pollutants were estimated by the grid(1㎞x1㎞), the source classification, and the time on the basis of the type and the amount per month of the fuel. The important results from this study were as followings: The average emission quantity(rate) of SO₂, TSP, NOx, CO and HC showed 1926.74 ton/yr(61.09 g/sec), 367.83 ton/yr(11.66 g/sec), 1440.64 ton/yr(45.68 g/sec), 4698.33 ton/yr(148.98 g/sec) and 447.15 ton/yr(14.18 g/sec), respectively. In case of SO₂and TSP, the emission quantities were majorly contributed by stationary source(point source and area source) whose contribution percentages were calculated as 65.8%, 30.6%. On the other hand, emission quantities of NOx, CO and HC were highly contributed by mobil source(line source) whose contribution percentages were calculated as 59.3%, 84.2% and 88.6%.

원발성 폐암 환자의 생존율에 관한 보고

김현태,이상무,어수택,박춘식,정성환,허승재,남충희,강창희,김용훈 순천향대학교 1994 논문집 Vol.17 No.4

We analysed 404 patients with primary lung carcinoma who were treated at Soonchunhyang University Hospital from July, 1985 to september, 1993 in order to investigate the survival rate and epidemiolgical properties of primary lung cancer. They were 330 males and 74 females. The most prevalent decade was seventh. In terms of cell type, the squamous cell was 225 patients (55%), and adenocarcinoma, small cell, mixed type was 21%, 19%, 4%, respectively. Among non-small cell lung carcinoma, stage Ⅲa was the most prevalent one(92%). In case of small cell carcinoma, the limited stage was 64%. The 12-, 24-, 36- month survival rate of total patients was 57%, 31%, 22%, respectivley and median sruvival time was 15 months. The 36-month survival rate tended to be longer in non-small cell lung carcinoma than that of small cell lung cancer, but there was no difference between two groups, statistically. In non-small cell carcinoma, The 36-month survival rate and meidan survival time were longer in the stage Ⅰ and Ⅱ than those of Ⅲa, Ⅲb, Ⅳ (80% versus 38%, 22%, 0%, p<0.05). According to involvement of lymph node, the 36-month survival rate was longer in NO and N1 than those of N2, N3 (61.9%, 48.7% versus 17.7%, 17.3%, p<0.05). In small cell carcinoma, The 36-month survival rate and median survival rate were higher and longer in limited stage than those of extensive stage(16.1% and 13 month vs 10% and 8 month, p<0.05). In conclusion, we report here the incidence of primary lung carcinoma and the survival rate of paients with primary lung carcinoma who were treated in Soonchunhyang University Hospital.

消渴屬腎에 關한 文獻的 考察

金聖勳,郭桂豪 大田大學校 1991 論文集 Vol.10 No.1

α상분율의 변화가 층상조직 TiAl 합금의 열적안정성에 미치는 영향

金聖雄,이호년,吳明勳,山口正治,韋當文 대한금속재료학회 2002 대한금속·재료학회지 Vol.40 No.6

The thermal stability of lamellar microstructure in TiAl-Mo PST crystals containing C or Si was investigated. In addition, the variation of α-phase volume fraction in Ti-Al-Mo-(C, Si) systems was also investigated at several temperatures. It was found that Ti-46Al-1.5Mo-O.2C and Ti-46Al-1.5Mo-1.0Si alloys were very stable during heat treatments at various heating rates and temperatures. Moreover, the, α-phase volume fraction of Ti-46A1-1.5Mo-0.2C and Ti-46A1-1.5Mo-1.OSi alloys (stable composition) was less changed than those of Ti-47Al and Ti-46Al-1.5Mo alloys (unstable composition). From these results, the instability of the latter alloys was thought to be resulted from relatively higher variation of α-phase volume fraction during heating. Therefore, it could be suggested that the variation of α-phase volume fraction is an important factor that control the thermal stability of lamellar microstructure.

SESAME를 이용한 초고속 통신망에서의 안전한 원격 의료 서비스에 관한 연구

김수광,최용락,김성훈 大田大學校 産業技術硏究所 1997 산업기술연구소 論文集 Vol.8 No.1

Enforcing network security in telemedicine systems is necessary to ensure security of the information exchanged. This paper deals with the need for security in application programming based on the information superhighway. A secure network is critical for the survival and success of applications. In this paper we discuss some features of well-known security mechanisms such like Kerberos, NetSP, SPX and SESAME. We also propose a software design strategy of telemedicine systems using SESAME developed by ECMA.

醫療人의 義務

金成勳 제주한라대학 1991 論文集 Vol.15 No.-

a) Medical Care may be said to be a risky act in that it is to invade into human body more or less. Therefore, if done carelessly, it may cause a person's life and body to be dangerous. For the above reason, the law prescribes all things connected with medical care to be a generally prohibited act, and relealses its prohibition articles only for the men who have acqufred some knowledge and skill through a required course. The medical law prohibits the non-medical profession from doing medical care and limits its exclusive right only within the medical profession by prescribing that "Whoever is not the medical profession cannot do medical practice and even the medical profession can't do unlicensed medical practice." b) Likewise, the medical profession, for his tasks, has medical care, dental medical care, Korean medical care, birth assistance, nursing, and sanitary guidance respectively, and, for his mission, he must observe the article that "The medical profession should make effort for the development of people's health and con-tribute to the security of people's healthful lives. Therefore the medical law prescribes several articles for the duty accompanying the medical profession's medical care practices; that is, physician's duty to provide medical care, duty to safeguard confidential information, duty to issue medical certificate, prohibition of issuing medical certificate for unconsulted person, duty to prepare and maintain medical records, duty to instruct patients on home care, duty to report unusual deaths, duty to deal with extracted things, duty to report the state of affairs and employment, prohibition of embryonic sex discrimtnation, prohibition of record inspection, restriction of medical advertisements, duty to complete some required reeducation, etc. c) The medical profession, in doing medical care, must observe the standard that he should do it adequately in medicine, properly in medical skill, and with a good administrator's carefulness, And also it is a general rule that the content of medical care itself is not restricted beforehand by either the medical law or other laws. The reason is that the medical care, whose substance is the medical profession's independence and free discretion, must not be uniformly limited beforehand by the law or any other rules.

조형된 연골막판을 사용한 이개재건에 대한 실험적 연구

김성수,배용찬,정성훈,김석권 大韓成形外科學會 1991 Archives of Plastic Surgery Vol.18 No.4

Although carved cartilage grafts from rib are commonly used for ear reconstruction, it is difficult to mimic a normal pinna and these reconstructions are so firm and unnatural. Therefore, we had a basic experimental study for a new technique of ear reconstruction. We tried to creat a cartilage framework by moulding the perichondrial flap experimentally. The perichondrial flap with the vascular pedicle of the central vessels was elevated in rabbit ear and placed between the leaves of a silastic mould. This preparation was placed in a pocket under adjacent scalp and sic and eight weeks later the preparations was harvested and assessed gross and histological findings. The moulded perichondrial flap was well developed and a thin cartilage layer was recognized within the convolutions created by the mould. Grossly, it was not so firm but relatively soft and there was little difference between at six and eight weeks. Histologically, viable new chondrocytes and active cartilage formation were demonstrated in the perichondrium at both six and eight weeks. The moulded cartilage which was harvested after 6 weeks was irregular in thickness and it's chondrocytes were not completely developed. However, the cartilage which was harvested after eight weeks was relatively regular in thickness and it's cells, especially centrally located, were fully developed. Clinically, ear reconstructive may be completed by implantation of this moulded cartilage as traditional reconstructive method. Otherwise, this moulded cartilage can be harvested with its vascular pedicle and the pedicle can be anastomosed with superficial temporal artery. And then a split thickness skin graft on the perichondrium enveloping the moulded cartilage or covering with skin flap which was expanded with tissue expander may complete the ear reconstruction in single stage operation. If further investigations for materials of the mould, optimal period for maximum cartilage synthesis and durability of moulded cartilage are studied, this moulded perichondrial flap technique provides the potential advantage of ear reconstructions.

IT산업의 발전과 경쟁 및 입지정책

김경환,전성훈 서강대학교 경제학연구원 2004 시장경제연구 Vol.33 No.1

We look into the effects of information technology on the nature of key aspects of industrial organization and their ramifications on competition and industrial policies. The issues considered are: essential facilities, inter-generational technology competition, and bundling. We argue that the development of information technology requires a more prudent approach to competition policies. We also present the literature on the changing nature of industrial location and describe the spatial distribution of IT industries in Seoul and the Capital Region. We then make some suggestions for policy directions in industrial location.

患者의 同意와 醫師의 明說義務

金成勳 제주한라대학 1993 論文集 Vol.17 No.-

This study proposes to examine patient's consent and doctor's explanation-duty in the medical treatment. A medical injury with no patient's agreement, though it aims to cure his disease, is aqainst the law. Accordingly, if a patient intends to make his consent meaningful, he needs to understand fully his consent's object, that is, the medical practice on him. Nowadays, however, such a full understanding is difficult to expect. It is because modern mediciae is highly-specialized and sophistcated. So, it is necessary that doctors should explain their practices to the patients. Without their explanations, patients' aqreements would be perfunctory. According to some judicial precedents and some law theory, the doctors who didn't explain their practies fully or make medical practies without no patient's consent are supposed to be unlawful. All things considered, a patient's self-determination upon his body is prior to a doctor's medical practice.