원자로압력용기장 용접열영향부의 미세조직 변화가 Magnetic Barkhausen Noise 거동에 미치는 영향

김주학,윤의박,문종걸,박덕근,홍준화 韓國非破壞檢査學會 1998 한국비파괴검사학회지 Vol.18 No.4

최근 자기적 특성의 변화가 재료의 미세조직적 상태에 민감하다는 보고가 있다. 재료의 미세조직은 상(phase), 결정립의 크기, 석출물 등의 다양한 인자로 구성되며, 본 연구에서는 이러한 인자들을 이용하여 재료의 특성과 Barkhausen noise(BN)의 관계를 연관시키기 위한 시도를 하였다. ASTM A 508 Gr.3 원자로압력용기강을 대상으로 용접열영향부의 미세조직적인 변화를 일곱가지 대표적인 영역으로 구분하였고, 각 영역에서의 미세조직과 기계적특성의 변화를 파악한 후, 각 조건별로 BN을 측정하였다. 통상의 보자력이나 잔류자화 같은 자기적 성질은 큰 변화가 없었지만, BN은 미세조직의 상태에 따라 현격한 변화를 보였다. 결정립과 석출물의 크기가 증가함에 따라 BN은 증가하였고, tempered martensite 보다는 tempered bainite 조직에서 높은 BN을 나타냈다. Recent study has demonstrated that some magnetic properties are sensitive to the microstructural state of material. The ASTM A 508 Gr. 3 reactor pressure vessel steel has various microstructural changes including martensitic and bainitic phases, and various sizes of grain and precipitates in the weld heat-affected zone (HAZ). To correlate the microstructural state with Barkhausen noise (BN), specimens were prepared through simulating various weld thermal cycles using a thermal simulator. The conventional magnetic properties, i.e. coercive force, remanence and maximum induction, did not change significantly. whereas the BN amplitude and energy during a magnetization cycle changed markedly with microstructural state. The BN increased with increasing grain and carbide sizes, and the tempered bainite structure showed higher BN parameter than tempered martensite.

인체형태학적 변인, 신체구성, 최대근력 및 혈청 지질과 지단백 수준에 대한 규칙적인 저항성 트레이닝 효과

김석주,김학렬 木浦大學校應用스포츠 科學硏究所 2003 스포츠 科學硏究 Vol.2 No.-

The purpose of this study was to evaluate a changes anthropometric variables, body composition, maximal muscle strength(IRM) and serum lipids and lipoprotein concentration following time course of eight week weight training program in adult men and women The results and conclusion of this paper is as follows. 1.Eight skinfold thickness in men and women, respectively was not shown a significant difference followed training time course, but in the difference between group, men was shown a significantly high levels(p<.05, respectively) in body weight compared to women. However, Chest(2wks; p<.05, 4wks p<.01, 8wks; p<.05,) and thigh thickness(2wks, 4wks and 8wks; p<.05, respectively) of women was display a significantly high levels compared to men, but it was not significant difference in tricep, mid-axillary, sub- scapular, abdomen, suprailiac and sum of eight skinfold thickness between both group. 2. The body circumference in men and women, respectively was not significant difference followed training time course. In the difference between both group, upper arm and gluteal circumference was not shown a significant difference, but forearm(0wks; p<.05, 2wks; p<.05,4wks;p<.05 and 8wks; p<.01), vast(0, 2, 4wks and 8wks; p<.05,respectively), thigh(8wks; p<.05) waist(0, 4wks and 8wks; p<.05, respectively),calf(0, 2wks and 8wks p<.05, respectively) and sum of seven circumference(0, 2wks and 8wks; p<.05, respectively) was shown a significantly high levels in men compared to women. 3.Percent fat and fat mass was not significant difference between pre and post training, and between men and women. However, Fat free mass(pre; p<.05, post; p<.01) and total body water(pre; p<.05, post; p<.01) was significant difference between men and women, but it was not between pre and post training. 4. The changes of one repetition maximum following eight week weight training was significantly increased levels only squat(p<.05) of men, but no significant difference in the other variables. Also, in the difference between group, the changes of maximal muscle strength was shown a significantly high levels in men compared to women. 5. In the men, serum TC, HDL-C, LDL-C and TG concentration was not significant difference between pre and post training, but it was shown a significantly decreased levels in TC(p<.01) and LDL-C(p<.05) between pre and post training of women, Also, In the difference between men women, no significant difference in HDL-C, LDL-C and TG concentration, but TC(p<.01) concentration in post training was significantly low levels in women compared to men.

회귀구조에 따른 예측신경망의 음성인식 성능비교

한학용,김주성,허강인 東亞大學校 附設 情報通信硏究所 1998 情報通信硏究所論文誌 Vol.6 No.1

In this paper, we compare the recognition rate between Recurrent Prediction Neural Networks and CHMM according to increasing the prediction order, the number of hidden units for RPNN and the state for CHMM. We perform the recognition experiment of Korean 100 syllables and ETRI's SAMDOLI Speech DB. In the DIGIT syllables, the recognition rate of Neural Networks, 98.5%, similar to CHMM, 99%, of the 5 state numner. In the 100 syllabes, the Jordan's RPNN which based on the number of hidden units is larger than 25 units shows the higher reocgnition rate than CHMM of the 5 state number. When CHMM based on the 6 and 7 state, RPNN's recognition rate is lower than CHMM.

대기압 스트리머 코로나방전특성 및 이산화탄소 전환특성

조문수,김학규,곽동주,신용섭 경성대학교 공학기술연구소 2001 공학기술연구지 Vol.8 No.-

Deep interests have been paid on the application of non-thermal plasma technique th solve the environmental pollution problems. CO_2 is one of the severe pollutants which cause the acid rain and global warming. In this study, in order to improve the conversion efficiency of CO_2, the streamer corona discharge plasma and barrier discharge plasma reactors were made, and the conversion characteristics of CO_2 by the corona discharge plasma and some discharge characteristics of these discharge chambers are studied experimentally.

원자로 용접부의 국부적 미세조직 변화에 따른 동적탄성계수 측정

정용무,김주학,홍준화,정현규 한국비파괴검사학회 2000 한국비파괴검사학회지 Vol.20 No.5

원자로 재료인 SA 508 Class 3 강용접부 및 열영향부 모사 시험편에 대해서 초음파공명분광법으로 동적탄성계수를 측정하였다. 등방성 탄성계수를 가정하여 초기 추정 탄성 계수, c11, c12 및 c44 로부터 장방형 시편의 공명 주파수를 계산하였으며 계산된 주파수와 초음파공명분광법으로 측정된 주파수를 비교, 반복 수렴 절차를 거쳐 정밀한 탄성계수를 구했다. 열처리 조건의 차이 및 미세 조직의 차이에 따라 영률 및 전단 계수의 차이가 확실하게 나타났다. 미세한 베이나이트 조직에서의 영률 및 전단 계수는 조대한 마르텐사이트 조직보다 높았으며 이러한 경향은 미세 경도 시험 등의 다른 실험 결과와도 일치하였다. The dynamic elastic constants of the simulated weld HAZ(heat-affected zone) of SA 508 Class 3 reactor pressure vessel (RPV) steel were investigated by resonant ultrasound spectroscopy (RUS). The resonance frequencies of rectangular parallelepiped samples were calculated from the initial estimates of elastic stiffness c11, c12 and c44 with an assumption of isotropic property, dimension and density. Through the comparison of calculated resonant frequencies with the measured resonant frequencies by RUS, very accurate elastic constants of SA 508 Class 3 steel were determined by iteration and convergence processes. Clear differences of Youngs modulus and shear modulus of shown from samples with different thermal cycles and microstructures. Youngs modulus and shear modulus of samples with fine-grained bainite were higher than those with coarse-grained tempered martensite. This tendency was confirmed from other results such as micro-hardness test.

Comparison of Intranasal Ciclesonide, Oral Levocetirizine, and Combination Treatment for Allergic Rhinitis

Kim, Chang-Hoon,Kim, Jin Kook,Kim, Hyun Jun,Cho, Jin Hee,Kim, Jung-Soo,Kim, Yong-Dae,Lee, Heung-Man,Kim, Sung Wan,Cho, Kyu-Sup,Lee, Sang Hag,Rhee, Chae-Seo,Dhong, Hun-Jong,Rha, Ki-Sang,Yoon, Joo-Heon The Korean Academy of Asthma, Allergy and Clinical 2015 Allergy, Asthma & Immunology Research Vol.7 No.2

<P><B>Purpose</B></P><P>To evaluate the efficacy and safety of once-daily ciclesonide in comparison to both levocetirizine alone, and a ciclesonide/levocetirizine combination in patients with seasonal allergic rhinitis (SAR) and perennial allergic rhinitis (PAR).</P><P><B>Methods</B></P><P>Subjects exhibiting moderate to severe allergic rhinitis for longer than 1 year were randomized in an open-label, 3-arm, parallel group, multicenter study. Subjects received 200 µg ciclesonide, 5 mg levocetirizine, or a combination of both. Changes from baseline until the end-of-study visit (2 weeks following) were evaluated by reflective total nasal symptom scores (rTNSSs), reflective total ocular symptom scores (rTOSSs), physician-assessed overall nasal signs and symptoms severity (PANS), and rhinoconjunctivitis quality-of-life questionnaires (RQLQ).</P><P><B>Results</B></P><P>Significant improvements in rTNSS, PANS, and RQLQ in the ciclesonide monotherapy group were observed in comparison to the levocetirizine alone group. Three individual symptoms of rTNSS, including runny nose, nasal itching, and congestion, were improved in the ciclesonide-treated group. rTOSS scores for ciclesonide monotherapy improved from baseline, but no superiority over levocetirizine was shown. The absolute score and changes in rTNSS and PANS were positively correlated. Ciclesonide spray was more effective than levocetirizine in reducing nasal symptoms in both SAR and PAR patients. Ciclesonide and levocetrizine were well tolerated alone and in combination.</P><P><B>Conclusions</B></P><P>Our results provide support for an AR and its Impact on Asthma (ARIA) recommendation stipulating that ciclesonide is superior to levocetirizine for the treatment of AR, with tolerable safety. Addition of levocetirizine to ciclesonide did not give further clinical benefit over monotherapy.</P>

북한의 권력승계와 남북관계의 전망

정주신 ( Joo Shin Chung ) , 김학만 ( Hag Man Kim ) 朝鮮大學校 統一問題硏究所 2010 統一 問題 硏究 Vol.25 No.1

이 논문의 목적은 김일성 시기 그 아들인 김정일이 권력승계를 해 왔듯이 김정일 시기에도 그 아들인 김정은에게로 권력이 승계된 데에 그 초점을 두고자 한다. 이 논문은 북한의 권력승계를 고찰하기 위해서 김일성에서 김정일로 부자세습을 해 온 것처럼 이 권력승계 이후 김정일 시기 또 다시 김정은으로 3대에 걸친 부자세습으로 그 아들의 권력승계가 필연적으로 이뤄진 것을 전제로 내용을 전개하고자 한다. 결과적으로 북한이 권력승계를 빠르게 진행하고 있음은 무엇인가 불안한 느낌을 준다. 3대에 걸친 권력세습은 물론 정치에 갓 데뷔한 아들을 권력의 최정상으로 격상시킨 것은 김정일의 병세가 치명적이라는 점을 암시한다고 볼 수 있다. 이러한 김정일의 권력상속 의도는 그간 김일성-김정일의 북한 통치를 보장받고 안정된 체제유지를 이끌고자하는 속셈을 보여준 것으로 풀이된다. This study analyses the succession of power to Kim Jeong-eun as the power of Kim Il-sung was passed to his son Kim Jeong-il. To analyse the power succession of North Korea, this study focuses on father-to-son succession of power for three generations. In conclusion, it feels unstable for North Korea to have a fast power transfer. The transmission of power to a son making his first debut to the political world implies Kim Jeung-il has a fatal condition or disease. Such intention to transmit power to his son is interpreted as a means to maintain a stable political system and firm control.

북한의 권력승계와 남북관계의 전망

정주신 ( Joo Shin Chung ),김학만 ( Hag Man Kim ) 조선대학교 동북아연구소(구 통일문제연구소) 2010 동북아연구 Vol.25 No.1

이 논문의 목적은 김일성 시기 그 아들인 김정일이 권력승계를 해 왔듯이 김정일 시기에도 그 아들인 김정은에게로 권력이 승계된 데에 그 초점을 두고자 한다. 이 논문은 북한의 권력승계를 고찰하기 위해서 김일성에서 김정일로 부자세습을 해 온 것처럼 이 권력승계 이후 김정일 시기 또 다시 김정은으로 3대에 걸친 부자세습으로 그 아들의 권력승계가 필연적으로 이뤄진 것을 전제로 내용을 전개하고자 한다. 결과적으로 북한이 권력승계를 빠르게 진행하고 있음은 무엇인가 불안한 느낌을 준다. 3대에 걸친 권력세습은 물론 정치에 갓 데뷔한 아들을 권력의 최정상으로 격상시킨 것은 김정일의 병세가 치명적이라는 점을 암시한다고 볼 수 있다. 이러한 김정일의 권력상속 의도는 그간 김일성-김정일의 북한 통치를 보장받고 안정된 체제유지를 이끌고자하는 속셈을 보여준 것으로 풀이된다. This study analyses the succession of power to Kim Jeong-eun as the power of Kim Il-sung was passed to his son Kim Jeong-il. To analyse the power succession of North Korea, this study focuses on father-to-son succession of power for three generations. In conclusion, it feels unstable for North Korea to have a fast power transfer. The transmission of power to a son making his first debut to the political world implies Kim Jeung-il has a fatal condition or disease. Such intention to transmit power to his son is interpreted as a means to maintain a stable political system and firm control.

Studies of Soybean Tissue Culture and Transformation

Joo Hag Kim,Clifford E . LaMotte 한국응용생명화학회(구 한국농화학회) 1994 농업생명과학 Vol.1 No.1

Development of a New Process for Mass-Production of Virus-Free Seed Bulbs of Garlic(Allium sativum L.) Through Plant Tissue Culture Technique

Joo-Hag Kim(김주학) 한국생물환경조절학회 1996 한국생물환경조절학회 심포지움 및 기타간행물 Vol.- No.-