신장트리 기반 유전자 알고리즘에 의한 비선형 fcTP 해법

조정복(Jungbok Jo),고석범(Sucbum Ko),Mitsuo Gen(Mitsuo Gen) 한국정보과학회 2005 정보과학회논문지 : 소프트웨어 및 응용 Vol.32 No.8

수송문제는 산업공학 및 OR 그리고 전자계산학 분야에서 중요한 문제 중의 하나로 인식된다. 수송 문제가 시설을 수립하거나 고객들의 요구를 이행하기 위한 추가적인 고정 비용과 연관될 때, fcTP(fixed charge Transportation Problem)라 한다. fcTP는 이전의 고전적인 방법으로 해결하기 어려운 NP-hard 문제들 중의 하나이다. 본 논문에서는 비선형 ftTP를 해결하기 위한 신장트리 기반 유전자알고리즘을 제안한다. 특히, 염색체(chromosome)에 대한 feasibility criteria와 repairing procedure를 포함하는 GA 염색체 표현에 대해 새로운 아이디어를 제안한다. 또한, 본 논문에서 제안하는 방법의 효율성을 입증하기 위한 여러 가지 수치 실험 결과를 기술한다. The transportation problem (TP) is known as one of the important problems in Industrial Engineering and Operational Research (IE/OR) and computer science. When the problem is associated with additional fixed cost for establishing the facilities or fulfilling the demand of customers, then it is called fixed charge transportation problem (fcTP). This problem is one of NP-hard problems which is difficult to solve it by traditional methods. This paper aims to show the application of spanning-tree based Genetic Algorithm (GA)approach for solving nonlinear fixed charge transportation problem. Our new idea lies on the GA representation that includes the feasibility criteria and repairing procedure for the chromosome. Several numerical experimental results are presented to show the effectiveness of the proposed method.

Influence of image quality on curved liquid crystal display for immersive environment as viewing position

Lee, Jungbok,Kwak, Min-Gi,Lee, Chan-Jae Informa UK (TaylorFrancis) 2018 Molecular Crystals and Liquid Crystals Vol.663 No.1

국어 경어법의 전략적 용법에 대하여

이정복 서울대학교 어학연구소 1999 語學硏究 Vol.35 No.1

This paper aims to introduce and analyze the concept of strategic usage and its subclasses by distinguishing normative from strategic usage of Korean honorifics. Normative usage is defined as the speaker expresses and accepts personal relations - such as power or distance relations with the hearer - by the use of honorifics. Most Korean speakers know how to effectively use honorifics appropriate for various situations, based on age, gender, generation, personal intimacy, and so on. This common intuition among the speakers passes for a quasi-constrained norm of the speech community. So it is more basic and usual usage of Korean honorifics. However, in a sense, strategic usage is defined as a means by which the speaker uses language minipulatively to achieve a special purpose through the change of honorific usage. Therefore, strategic usage, unlike normative usage, involves particular purposes, and stronger intentions on the part of the speaker. Also the change in honorific usage is essential to this strategy. It is obviously distinguished from basic or normative usage in that the speaker intensionally adjusts the degree of treatment for the hearer by changing both speech levels and title. It has five subclasses: the strategy of "highly treating the giver," "rearranging the conflictive social facts," "showing off the speaker's higher status," "changing the speaker's identity," and "adjusting psychological distance with the hearer." Strategic usage of Korean honorifics plays a major role in the use of Korean language. It adjusts and maintains social relations and the psychological distance among participants. It is an efficient means to understand Korean people and their mutual relations in society. From this perspective, I focused my research on the strategic usage of honorifics which has been ignored for a long time. Thus, I think we could view Korean honorifics with less prejudice and further widen our understanding of the language and social life of the Korean people.

Efficiency Calibration of C-14 for LSC – It’s Problems and Resolutions

Hajin Song,JungBok Lee,Jong Ki Choi,Chan Young Kim,Homyung Lee,Yong Jin Lee,Jungsuk Oh 한국방사성폐기물학회 2021 한국방사성폐기물학회 학술논문요약집 Vol.2021 No.11

Collusion-Resistant Identity-Based Proxy Re-Encryption Without Random Oracles

JunJie Qiu,JungBok Jo,HoonJae Lee 보안공학연구지원센터 2015 International Journal of Security and Its Applicat Vol.9 No.9

In an identity-based proxy re-encryption scheme, a semi-trusted proxy can convert a ciphertext under Alice’s public identity into a ciphertext for Bob. The proxy does not know the secret key of Alice or Bob, and also does not know the plaintext during the conversion. In identity-based proxy re-encryption, the collusion of the proxy and a delegatee may result in the decryption of ciphertext for delegator. In this paper, we present a new scheme which can avoid the collusion of proxy and delegatee. Our scheme improves the scheme of Chu and Tzeng while inheriting all useful properties such as unidirectionality and non-interactivity. In our scheme, we get the security by using added secret parameter and change the secret key and re-encryption key. Our sheme is secure against Chosen-Ciphertext Attack (CCA) and collusion attack in the standard model.

Glass Powder 충전밀도가 착화장치 유리밀봉에 미치는 영향

고영균(Youngkyun Ko),이정복(Jungbok Lee),우희석(Heesok Woo),최홍석(Hongseok Choi),류병태(Byungtae Ryu) 한국추진공학회 2015 한국추진공학회 학술대회논문집 Vol.2015 No.5

PMD 사업의 일환으로 개발되는 착화장치는 외부의 전기적 에너지를 화학적 에너지로 변환시켜 각종 유도탄 및 우주발사체의 추진기관 점화 및 기계장치의 에너지원으로 사용되는 것으로 본 연구에서는 착화장치 유리밀봉결합체의 Glass Powder 성형, 소결, Sealing공정을 검토하고 글래스비드 소결시 수축율, 충전밀도에 따른 유압시험을 실시하여 작업성을 고려한 최적의 조건은 소결시 글래스비드 수축율이 더 이상 변화가 없고 높은 유압시험 측정값을 보이는 충전압 120㎏(충전밀도 1.90 g/㎤)으로 설정하였다. This is a study of glass powder compact density effects on glass sealing using initiator.

다변량 관측치를 갖는 임상시험에서 집단축차검정후 조건부 추정

이재원,이정복 高麗大學校統計硏究所 2002 應用統計 Vol.17 No.-

본 연구에서는 다변량 관측자료를 갖는 임상시험에서 집단축차검정후 점추정 및 구간추정 방법에 대해서 조건부 추정방법을 제안하여 추정량의 편의 감소 효과와 포함확률을 확인하였다. 점추정에서 Fan(2000a)이 제안 단일 관측치의 조건부 추정법을 다변량 관측치에서의 조건부 추정법으로 확장하였으며, 다변량 관측치의 조건부 정확신뢰구간을 제안하였다. 제안된 추정법의 효과를 확인하기 위해 모의실험을 통해 비조건부 최대우도추정량, 비조건부 중위불편추정량(median unbiased estimator) 100(1-alpha)% 정확 신뢰구간의 중간점(midpoint of exact confidence interval) 그리고 조건부 추정량(conditional estimator) 을 비교하였으며, 구간추정에 있어서는 쉽게 계산할 수 있는 방법(naive method)과 비조건부 정확 신뢰구간과 조건부 정확신뢰구간을 비교하였다. 조건부 추정방법에 대해 추정치의 편의를 줄여주는 효과를 확인하였으며, 구간추정에서도 기존 방법보다 향상된 결과를 얻었다. We compare bstopping of clinical with multivariate observations. For the point estimation, we investigate the properties of the maximum lidelihood estimator, median unbiased estimator, the midpoint of the exact confidence interval, the extended conditional estimator. For the interval estimation, the naive confidence interval, the repeated confidence interval, the unconditional exact confidence interval and the conditional exact confidence interval are considered under various situations.

A semiparametric method to measure predictive accuracy of covariates for doubly censored survival outcomes

Han, Seungbong,Lee, JungBok The Korean Statistical Society 2016 Communications for statistical applications and me Vol.23 No.4

In doubly-censored data, an originating event time and a terminating event time are interval-censored. In certain analyses of such data, a researcher might be interested in the elapsed time between the originating and terminating events as well as regression modeling with risk factors. Therefore, in this study, we introduce a model evaluation method to measure the predictive ability of a model based on negative predictive values. We use a semiparametric estimate of the predictive accuracy to provide a simple and flexible method for model evaluation of doubly-censored survival outcomes. Additionally, we used simulation studies and tested data from a prostate cancer trial to illustrate the practical advantages of our approach. We believe that this method could be widely used to build prediction models or nomograms.

유창성 장애의 언어치료 관련 경시적 계수자료의 유연한 분석

이수복(Soobok Lee),이정복(Jungbok Lee) 한국자료분석학회 2023 Journal of the Korean Data Analysis Society Vol.25 No.6

In this study, the goal was to apply a flexible and easy-to-manage analysis method through a model that includes a dispersion parameter in the longitudinal analysis method of count data. In the analysis of count data, it may be inconvenient to change the statistical model depending on whether there is under- or over-dispersion. To compensate for these weaknesses, We have applied a statistical method including a dispersion parameter to the statistical model. The count data covered were included in the diagnosis of fluency disorders and the evaluation of the effectiveness of speech therapy. but research on speech-language therapy is limited by being conducted on small numbers of subjects for several reasons. Therefore, statistical analysis methods that work only on large samples, are complex, or require excessive calculations in the model fitting process were not appropriate for the field. With this background, we applied the Conway-Maxwell Poisson model to longitudinal data analysis of fluency disorders. We evaluated whether the model that reflects the level of data dispersion in the model was consistent with the speech therapy data for fluency disorders by comparing it to the existing Poisson mixed model and linear mixed model. In particular, the Conway-Maxwell Poisson model had the advantage of reflecting well when the degree of dispersion was different for each group or specific subgroup. 본 연구에서는 계수자료의 경시적 분석 방법에서 산포 모수를 포함하는 모형을 통해 유연하고, 용이한 분석 방법을 논의하는 것을 목표로 하였다. 계수자료의 분석에서는 과소, 과대 산포여부에 따라 통계적 모형을 변경해야 하는 번거로움이 있을 수 있다. 이러한 약점을 보완하는 하나의 방법으로 통계적 모형에 산포 모수를 포함한 통계적 방법을 적용하기로 하였다. 본 연구에서 다루는 유창성 장애의 진단, 언어치료의 효과 평가에서는 다양한 계수자료가 포함되어 있으나, 언어치료 연구는 여러 이유로 인하여 소수의 대상자에서 수행되는 제약을 갖고 있다. 그러므로 대표본에서나 작동하거나 복잡하거나 모형 적합 과정에 과도한 계산 요구는 통계적 분석방법은 해당 분야에 적합하지 않았다. 이러한 배경하에 본 연구에서는 Conway-Maxwell 포아송 모형을 경시적 자료 분석에 적용하였으며, 자료의 산포 수준을 모형안에 반영하는 모형이 기존의 포아송 혼합모형, 선형혼합모형에 비교하여 유창성 장애의 언어치료 자료에 부합하는지 평가하였다. 특히 Conway-Maxwell 포아송 모형에서 각 군별 또는 특정 소집단별로 산포의 정도가 다를 경우 이를 잘 반영하는 장점이 있었다.

MDCT-based scoring system for differentiating angiomyolipoma with minimal fat from renal cell carcinoma.

Kim, Mi-hyun,Lee, JungBok,Cho, Gyunggoo,Cho, Kyoung-Sik,Kim, Jungmi,Kim, Jeong Kon Acta Radiologica] 2013 Acta radiologica Vol.54 No.10

<P>Subtype-related various computed tomography (CT) features of renal cell carcinoma (RCC) are a confusing factor in differentiating angiomyolipoma with minimal fat (AMLmf) from RCC. To overcome RCC heterogeneity, a scoring system, which integrates multiple discrimitive parameters can be helpful for differentiating AMLmf from RCC.</P>