김종민의 작업일지

김종민 부산대학교 2010 국내석사

These paintings shown through this exhibition originates from doubts about the invisible world which were carried from childhood of the artist. These doubts are questions about the things inside such as mind, soul, emotion and so on, which are invisible. The artist attempted to do imaging questions about how to explain those things inside through this exhibition. The work started from such question about “how inner states can be expressed as visible images?" reaches to the thinking from the artist's experiences in the life of that they are shown by expressions and poses of people. Particularly, external changes caused by mental state of the inner world of people as shown by the Oriental medicine encouraged the artist more and more to observe expressions and poses of people and the artist once attempted to connect inner images with external expressions through a semiotic approach. The artist wanted to tell about how to express the inner side by which impressions and poses of people came to show and furthermore, made an attempt to show the external expression of the inner side much stronger through the formative property of images expressed by paintings.

정수처리공정별 소독부산물 발생 및 종분포 특성

김종민 전북대학교 대학원 2009 국내석사

Water treatment processes of the research objective drinking water treatment plant are composed of prechlorination, coagulation, precipitation, sand filtration and postchlorination process. The main chlorination by-product (DBPs) of the research objective drinking water treatment plant are Trihalomethanes(THMs) and Haloacetic acids(HAA_(5)) that are investigated the characteristics of speciation and occurrence in full-scale drinking water treatment plant by the water treatment processes and investigated about the positive control method. The results were as follows. The maximum DOC concentrations of raw water was 4.070 mg/L and the minimum concentrations was 0.690 mg/L, the maximum of Specific UV absorbance(SUVA) was 4.4(L/mg/m) and the minimum was investigated 0.8. Mean value was 1.8 was the characteristics of NOM in raw water appeared with hydrophily. The process by average SUVA of the raw water, precipitation water, filtrate water, treated water was investigated respectively with 1.8, 2.1, 2.1 and 1.3 but the average concentrations of Trihalomethanes(THMs) increased respectively by the water treatment processes. At summer THMs concentration was caused by seasonally with water temperature increasing appeared highly. The average concentrations of Haloacetic acids(HAA_(5)) at each process which is precipitation water, filtrate water, finished water was investigated respectively with 15.5 ppb, 14.9 ppb and 25.8 ppb. It was caused by the concentration of free chlorine decreasing that Some of HAA_(5) concentration was decreasing from filtration process. HAA_(5) concentration was highest at summer From all processes the major species of THMs was chloroform and the second highest was bromodichloromethane(BDCM), the third highest was dibromochloromethane(DBCM), while the concentration of bromoform was below detection limites. The ratio of chloroform/THMs at precipitation water, filtrate water, finished water was respectively 0.88, 0.87 and 0.73, with the fact that the bromine orgin THMs from the disinfecting process which is investigated with 0.73 occurs plentifully. The ratio of THMs/HAA_(5) in treated water was 0.57. HAA_(5) occurs about dobule than THMs. From all processes the major species of HAA_(5) was trichloroacetic acid(TCAA) and the second highest was dichloroacetic acid(DCAA), the third highest was dibromoacetic acid(DBAA), while the concentration of monochloroacetic acid(MCAA) and monobromoacetic acid(MBAA) was below detection limites. The sum of DCAA and TCAA was 90.4% of HAA_(5) on average base, but in case consequently, the ratio coming to be low below 50%, do HAAs disinfecting by-product managements are thought with the fact that maybe add DBAA. It was speciation of THMs that was caused by changing SUVA value of each process than changing SUVA and water temperature of raw water. It was speciation of HAA_(5) that was caused by changing the concentration of bromine in raw water and changing chlorine dose. In case of few of artificial pollution source arround river, SUVA value of River was higher than that of reservoir in few of artificial pollution source. At that time the ratio of THMs/HAA_(5) increased and the occurrence of THMs and HAA_(5) decreased in treated water. Consequently, it was found that the occurrence of DBPs decreased with raising a ratio of river water in raw water.

高機能性 水晶振動素子의 開發과 應用

김종민 동아대학교 1998 국내박사

ndCF: 메모리 기반 협업 필터링의 다차원 확장

김종민 부경대학교 대학원 2022 국내석사

Collaborative filtering predicts the user's preference for items that have not yet been experienced. It is a system that finds users with a pattern similar to the user's evaluation record and predicts the user's future rating with the value they evaluated the item. Using this, if a system that selects and recommends items with high prediction ratings to users is provided, the user will be satisfied and use them. However, if the predicted rating is not accurate, the user may be dissatisfied with the recommended items, which poses a threat to the service. In order to predict the rating more accurately, users with similar patterns must be found more precisely, and to this end, the method of calculating similarities must be improved. ndCF, a technique proposed in this paper, proposes a multidimensional similarity calculation method so that memory-based collaborative filtering reflects high-dimensional data. Existing collaborative filtering was calculated based on the user's evaluation records, so attribute-related trends such as group preference for specific attributes could not be reflected in user rating prediction. One item has several types of attributes. One movie has a genre, release year, and cast, and one food has nutrients and ingredients. The user's preference for these attributes is not explicitly revealed in the evaluation record. In this paper, this is defined as a "potential preference". Using the potential preference similarity between users will make the recommendation system more sophisticated. To this end, this paper introduces ndCF including the following four main techniques. 1. When attribute types are continuous, a method of categorizing them into categorical attribute types with order is presented. 2. When there is an order between each attribute type, a convolution application technique is proposed to express the association between the attributes. 3. Evaluate the user's item and link the attribute information of the item to calculate the user's potential preference for each attribute. 4. Combine the user's evaluation-like matrix with a number of latent preference-like matrices. For performance evaluation, the proposed ndCF was compared with other collaborative filtering methods for MovieLens-100K and MovieLens-1M datasets. ndCF showed higher performance than memory-based collaborative filtering. In addition, the performance improved by 3.2 to 12.5% compared to collaborative filtering using the Pearson correlation coefficient, and the performance improved by about 139% or more compared to collaborative filtering using the Normal PCC. 협업 필터링은 사용자가 아직 경험하지 않은 아이템에 대한 선호를 예측한다. 사용자의 평가 기록과 유사한 패턴을 보이는 사용자들을 찾아 그들이 아이템을 평가한 값으로 사용자의 미래 평점을 예측하는 시스템이다. 이를 이용하여 사용자에게 예측 평점이 높은 아이템들을 선별 추천하는 시스템을 서비스한다면 사용자는 만족하며 이용할 것이다. 하지만 예측된 평점이 정확하지 않다면 사용자는 추천받는 아이템들에 불만을 가질 수 있고, 이는 서비스에 위협이 된다. 평점을 더 정확하게 예측하기 위해서는 유사한 패턴을 보이는 사용자들을 더 정교하게 찾아야 하며, 이를 위해 유사도 산출 방법을 개선하여야 한다. 본 논문에서 제안하는 기법인 ndCF(-dimension expansion for memory-based Collaborative Filtering)는 메모리 기반의 협업 필터링이 고차원의 데이터를 반영하도록 다차원 유사도 산출 방법을 제안한다. 기존의 협업 필터링은 사용자의 평가 기록을 중심으로 계산하기에 특정 속성에 대한 집단 선호도 등 속성 관련 트렌드를 사용자 평점 예측에 반영하지 못하였다. 하나의 아이템은 여러 종류의 속성을 가지고 있다. 한 영화는 장르, 출시연도, 출연배우 등을 가지고, 한 음식은 영양소, 성분 함유량 등을 가진다. 이러한 속성에 대한 사용자의 선호는 평가 기록에 명시적으로 드러나지 않는다. 본 논문에서는 이를 “잠재 선호”라 정의한다. 사용자 간의 잠재 선호 유사도를 이용하면 추천 시스템은 더욱 정교해 질 것이다. 본 논문은 이를 위하여 다음의 4가지 주요 기법을 포함한 ndCF를 소개한다. ① 속성 종류가 연속적일 때, 순서가 있는 범주형 속성 종류로 범주화하는 방법을 제시한다. ② 각 속성 종류 사이에 순서가 있을 때, 속성 사이의 연관성을 표현하기 위해 컨벌루션 적용 기법을 제안한다. ③ 사용자의 아이템에 대한 평가와 아이템의 속성 정보를 연결하여 각 속성들에 대한 사용자의 잠재 선호를 계산한다. ④ 사용자의 평가 유사 행렬과 다수의 잠재 선호 유사 행렬을 결합한다. 성능 평가를 위하여 MovieLens-100K, MovieLens-1M 데이터셋에 대해 다른 협업 필터링 방법들과 제안하는 ndCF를 비교하였다. ndCF는 메모리 기반 협업 필터링에 비해 높은 성능을 보였다. 또한, 피어슨 상관 계수를 이용한 협업 필터링에 비해 3.2~12.5%의 성능 향상을 보였으며, 정규화된 피어슨 상관 계수(Norm PCC)를 이용한 협업 필터링에 비해 약 139% 이상의 성능 향상을 보였다.

敎育課程 變化 要因에 대한 理論的 探索

김종민 순천대학교 1996 국내석사

얇은 벽 구조의 티타늄 합금 밀링 가공에 관한 연구

김종민 경상국립대학교 대학원 2022 국내박사

Titanium alloy has heat resistance, corrosion resistance, and light weight properties. Because of its high specific strength, it is used in various mechanical structural parts to reduce the weight of aircraft and automobiles, and is also used as engine parts because of its heat-resistant properties. Also, due to its high biocompatibility, it is widely used in medical products such as implants and artificial bones. Titanium alloy has low thermal conductivity, so the cutting temperature rises high, and chattering is easy to occur due to its low modulus of elasticity. Therefore, the tool life is shortened and the surface integrity and machining precision are deteriorated. In general, aircraft parts of titanium alloy are designed with various types of thin-walled structures in order to maximize the effect of weight reduction. When milling a thin-walled structure, it is difficult to maintain dimensional accuracy due to machining deformation and vibration. In particular, when machining corners in a thin-walled structure, shock and vibration are likely to occur because the cutting area increases rapidly. They create tool marks on the machined surface, which deteriorate the surface quality, and shorten the tool life by breaking the cutting edge. In this study, the machining characteristics of titanium alloys widely used as aerospace parts were investigated. In order to improve productivity and machining quality, the effective range of cutting parameters and optimal values ​​were derived. In order to find an effective machining method for milling of thin-walled structures common to aircraft parts of titanium alloys, machining experiments were conducted on the basic shapes of ‘ㅡ’ and ‘L’-shaped thin walls. To optimize the E-shaped thin-wall milling, cutting simulation was performed to derive effective cutting conditions and tool paths. To verify this, a cutting experiment was performed. And it was confirmed that the optimization was successfully conducted through comprehensive analysis of the machining surface, dimensional error, tool condition, and cutting signal. The results of this study on the milling process of thin-walled titanium alloys are expected to contribute to the improvement of machining quality and productivity by applying them to actual aircraft parts machining.

전자기 바크하우젠 음향신호를 이용한 레일 축응력 추정

김종민 忠南大學校 大學院 2022 국내박사

장대레일은 레일 체결장치와 침목 및 도상에 의해 이동이 억제되어 있기 때문에 온도의 상승·하강에 의한 자유신축이 억제되므로 신축량에 상응하는 에너지가 레일 내부응력으로서 축적된다. 다시 말해서 레일이 축방향으로 전혀 구속되지 않고 자유로운 상태에서 온도 변화를 받으면 레일은 선팽창계수에 따라 신축하게 되지만, 궤도구조상 레일이 구속되면 레일 축방향으로 응력이 발생하게 된다. 즉, 철도 공용중에 궤도의 레일은 주행하는 열차와의 상호작용에 의한 작용응력과 궤도틀림 그리고 선로유지 관리작업과의 상호작용에 의한 발생응력과 궤도틀림 보수 등에 의해 다량의 축 응력이 내부에 응축된다. 따라서 철도선로 운영 및 유지관리기관인 한국철도공사(코레일) 등에서는 재설정이라는 작업을 통해 레일 내부에 응축된 축 응력을 해소하고 있는바, 레일의 축 응력을 적정 시기마다 측정 및 관리 할 필요가 있다. 레일 내부에 응축된 축 응력을 측정하기 위해 비파괴기법을 적용하는 것이 효율적인바 최근 국내에서는 이러한 사회 경제적인 요구에 부응하기 위하여 전자기바크하우젠 음향신호(MBN)를 적용한 비파괴검사 장비(MRS-100)가 개발되었다. 본 연구에서는 개발된 MRS-100 MBN 장비를 사용하여 SS275 강재시편 및 60E1 레일시편에 축방향 응력을 가하면서 전자기바크하우젠 음향신호의 특성변화를 제시하였다. 이후 레일온도와 현재 레일의 종방향 응력을 정량적으로 평가하여 현재 레일의 중립온도를 도출하였는바, 설정온도와의 차이는 0.2℃ ~ 최고 2.5℃로서 ±3℃ 이내의 정밀도를 보이는 것으로 나타났으며 60E1 레일 시편의 변동계수와 응력분해능에서의 목표치(±3℃ 이내) 달성이 현장에서도 그대로 재현되었다. 따라서 본 레일의 축응력 추정값은 정확하다고 볼 수 있으므로 전자기 바크하우젠 음향효과를 이용한 레일 축웅력 추정 방법은 현장 적용이 가능할 것으로 판단된다. There are so many stored some energy as internal stress in CWR. By the way, it's because expansion and contraction is controled by rail fastener, sleeper and ballast. In order to solve this problem, Korea Railload Corporation(KORAIL) hasbeen solving axial stress in CWR through resettlement of CWR. So, they need to measure and manage rail axial stress every reasonable term. In order to do that, Magnetic Barkhausen noise (MBN) has the potential to detect fatigue, creep, stress and hardness in ferromagnetic materials. Recently, non-destructive measurement equipment using magnetic barkhausen noise has been developed to measure the axial stress of railway rails in Korea. MBN has different characteristics depending on the type of ferromagnetic steel and residual stress. In this study, the MBN signal characteristics according to the stress change of SS275 steel and speciment of 60E1 rail were experimentally analyzed using the developed MBN equipment. After those rail temperature and longitudinal stress were estimated quantitatively, rail neutral temperature was deduced, It showed precision within ±3℃ between ST and RNT. And the target achivement about coefficients of variation and stress resolution that was tested and showed result in 60E1 speciments were reappeared. Therfore I think estimated result of rail axial stress was deduced accurately. Finally I also judge this method that estimation of axial stress in rail using magnetic barkhausen noise signal is able to be applyed in a construction field. However, I think we should avoid points that is coated with paint and oil or being serious wear. Also we'd better avoid the surface that is carved stamp on the rail. And it is necessary to measure consistenly on the one side surface.

자율무인 잠수정 운동제어 시뮬레이터 개발 연구

김종민 부경대학교 대학원 2012 국내석사

An Autonomous underwater vehicle is utilized in variety field for underwater circumstances. So we need to know the system of AUV to use properly. The motion of AUV can be defined as a 6 Degree of freedom dynamics model which is composed of the complex components. The dynamics model of Autonomous underwater vehicle includes hydrostatic force, hydro damping, fin force, added mass, thrustor force. These variables control system in order to apply it to reflect the actual physical phenomenon about the characteristics of the various forces and the hull needs to be modeled mathematically. Set the path to take command of the driver and the path and progress of AUV heading to compensate for the difference between each Track angle error tracking algorithm and the PD controller via the control input value to minimize the error value was calculated. The dynamic simulation of AUV is based on Matlab program which can perform the horizontal, vertical , way-point tracking motion including 3 dimension points. And using Labview simulation was performed to configure the Simulator AUV made ​​applicable to the actual performance compared to the motion controller and the performance of the algorithm were verified.

윤동주 시의 성서적 배경 연구 : 윤동주와 다윗의 내면의식 비교를 중심으로

김종민 순천대학교 대학원 2011 국내석사

What has been the most frequently discussed in analyzing the poems of a poet 'Yoon, Dong-Ju (尹東柱)' is the proposition called 'Aesthetics of Shame'. Actually, there are many excellent phrases that it is sorrowful for the sufferings of our lives and reflects them depending on the emotion called 'Shame' in his works. The 'Shame' in his works is the one of conscience with the most ethical and religious meaning among several instincts of a human being. It becomes aware that the shame of a poet is one of self-reflections for the existence of a human being as it is rather than one of emotions in the mortal time of a human being. If a human being honestly faces his shame, his whole existence - the whole body reacts. And such experience that a human being directly faces shame was his power to make himself tear his heart and vent his anger with an excellent reading of poetry. Another important factor in his works was religious belief. He entered religious maturity passing through the religious growth period, doubts and opposition period that every Christian becomes go through. Accordingly, he had become naturally or whether consciously or subconsciously consider, judge and act in his Christian worldview. In a sense, his poetry is religious confession. Christian religion was deeply placed in his spiritual world as much. If his poetry is mainly classified into three (3) parts, they are the spirit, nature and self-reflection. He saw the spirit via nature and did nature via the spirit. And it continues to self-reflection again and then, finally it comes to the thought of the Old Testament. His poem made aware that mind and the spirit of a human being becomes indoctrinated by Japanese Imperialism under Japanese colonial rules and on the other hand, they was a watchman who shouts out the salvation of sleeping souls. The name of 'David' directly was mentioned in the bible 900 times or more. It is the name which was the most frequently recorded in the bible. Because he had a life full of vicissitudes, went through full of ups and downs and was the person who the most nearly came up to the Lord God. In a way, the Psalm that he made a confession in his life can be regarded as what he spoke out the most fundamental question and anguish of a human being. If the most poetic words of 'Yoon, Dong-Ju' come from nature, the ones of David come from reality. Especially, David who was suffered by lots of wars was singing weapons of a war, a place of refuge, environment and etc. as a poem. For example, they are a shield, a fortress, a rock, a war chariot, a castle and a mountain fortress and so on. The poets for appeal which are taking up the half of the Psalm come out from realities of life. David went through a number of wars. Even though he was surrounded by enemies on all sides and had no any way out of such difficult situation, what he can escape from such situation was just to go to the Lord God. It was his actuality. Perhaps, the first reaction when a human being faces difficulty and suffering will be the cry of pain. If the pain gets more severe, such cry becomes headed out to the transcendent. What he cried and shouted out to the Lord in such deadly sufferings can be regarded as the appeal to the Lord God. At an early age, a number of appeals were shown in the bible - especially, the Old Testaments. They are quite diverse from the appeal of the pietist to one of general people. David had elitism that the Lord God gives special blessings to the Israelites and selects only a Hebrew (the seed of Abraham) as the people of salvation. Especially, such elitism was the life and the education of the Jews which has been handed down for thousands of years. Of course, 'instructions and teachings of the Lord God' was placed inside of David, and it can be thought that such instructions and teachings were naturally revealed as his poems, songs and prayers. Atonement consciousness of 'Yoon, Dong-Ju' and David has a thread of connection with that it starts from the fundamental self-reflection of a human being. The atonement consciousness in the Old Testament age was drastic. The looks that David committed a sin and then asked for the forgiveness in the Psalm is touching beyond a desire. Like this, we can sufficiently get a sense of the looks that a human being makes fully a confession about a sin, is tormented by even a trivial sin and laments such sin in Yoon, Dong-Ju's works - 「Seosi (序詩)」- a poem instead of a preface of a book - or 「Chamhoirok(懺悔錄)」- Confession. David had 'elitism' that only the Jews has. Yun, Dong-Ju also loved a nation and was suffered from their pain and weakness. For the attitude of two poets for each nation, David radiated the appeal of a nation to the outside, but Yoon, Dong-Ju sublimated it internally. Also, Yoon, Dong-Ju moaned his sufferings to the Lord God, but David seemed to tease like a child. Eventually, it seems that two poets' inner minds were partially shared in a literary space - in the Bible, and such inner minds show as the answer for the most fundamental question of a human being toward the Lord God. Though the age, nation and culture were different each other, thus, they were poets who had brightened the darkness of their souls living through life's ordeal and their nations.

Evaluation of Quality Characteristics of Mackerel (Scomber japonicus) and Japanese Spanish Mackerel (Scomberomorus niphonius): Relationship Between Physicochemical and Sensory Properties During Storage Period

김종민 부경대학교 대학원 2022 국내석사

생선의 품질을 평가할 때 신선도는 가장 중요한 요소이며 여러가지 특성을 이용한 생선 및 수산물의 품질에 대한 연구가 이루어져 왔으나 확실한 지표의 설정이 이루어지지 않았다. 본 연구에서는 유익한 지표 개발을 위해 고등어 (Scomber japonicus)와 삼치 (Scomberomorus niphonius)의 저장 기간 동안 이화학적 및 관능적 변화의 상관관계를 조사하였다. 한국인이 소비하는 대표적인 어종인 고등어 (Scomber japonicus), 삼치(Scomberomorus niphonius) 어종을 선정하여 신선한 생선을 구매 직후 4°C에 보관하고 총 14일 동안 2일마다 품질 변화를 평가하였다. pH와 총 휘발성 염기성 질소 (TVB-N)는 보관 기간 동안 유의적으로 증가했다. 고등어의 pH 및 TVB-N 값은 저장 8일차에 6.213, 19.483 mg/100 g이었으며 삼치의 pH 및 TVB-N 값은 저장 10일차에 6.737, 15.14 mg/100 g로 초기 부패단계를 판단 하였다. pH 함량은 TVB-N 함량과 높은 상관관계를 보였으며 경도, 쫄깃함, 응집도 값은 저장기간 동안 감소하는 경향을 보였다. 이러한 이화학적품질 지표와 인간이 직접 느끼는 감각과의 상관관계를 알아보기 위해 총 10일동안 2일마다 전자코와 전자혀를 사용하여 관능평가와 함께 비교분석 하였다. 관능평가는 품질지수법을 이용하였으며, 저장기간 동안 지수가 증가하였다. 이화학적 변화와 관능적 변화는 매우 흡사한 경향을 보였으며, 고등어는 8-10일 까지, 삼치는 10일 까지 품질이 유지된다고 판단하였다. 본 연구는 수산물 품질인증제도의 기초자료로 활용될 수 있다.