친환경 원격 레이저 용접 가공 조건 예측을 위한 신경망 모델 개발

이상일(Sangil Lee),류광열(Kwangyeol Ryu),이화섭(Hwaseop Lee),이경준(Gyeongjun Lee),김덕영(Duckyoung Kim) (사)한국CDE학회 2014 한국 CAD/CAM 학회 학술발표회 논문집 Vol.2014 No.2

원격 레이저 용접(Remote Laser Welding; RLW)은 공정 시간의 감소, 용접 품질의 향상, 유연성 있는 공정 등의 장점을 가지고 있기 때문에 제품 생산 공정에서 각광받는 새로운 기술 중에 하나이다. 뿐만 아니라, 에너지 소비량에 있어서 효율성, 친환경적인 공정 등으로 많은 장점을 가지고 있다. 하지만 원격 레이저 용접은 운영 시스템의 한계로 인하여 레이저 용접 공정 도중에는 제품의 결점 및 용접 공정 에러 여부를 판단할 수 없다는 단점을 지니고 있다. 따라서 본 논문에서는 친환경 원격 레이저 용접시 가공 조건을 예측하기 위하여 신경망을 활용한 원격 레이저 용접 가공 조건 예측 모델을 개발 및 제안한다. 제안된 예측 모델은 레이저 용접 시 레이저 온도, 세기 등을 실시간을 관측하여 불량 및 결점을 줄일 수 있도록 실시간으로 레이저 용접 가공 조건을 변화 시킬 수 있도록 하기 위한 것이며 이를 위해 인공 신경망(Artificial Neural Network; ANN)을 사용한다. 제안된 모델은 원격 레이저 용접에 필요한 컨트롤 모듈로 활용될 수 있으며 제품 결점 및 불량률 감소, 에너지/자원 소비량 감소, 생산성 향상에 많은 도움일 될 것으로 예상된다.

대학생들을 대상으로 한 한국판 다차원적 심리적 유연성 척도(K-MPFI) 타당화 연구

이상일(Sangil Lee),김영윤(Youngyoon Kim),이선미(Seonmi Lee),김명성(Myungsung Kim),정동일(Dongil Chung),정두영(Dooyoung Jung) 부경대학교 인문사회과학연구소 2023 인문사회과학연구 Vol.24 No.2

본 연구의 목적은 다차원적 심리적 유연성 척도(MPFI)를 한국어로 번안하고 대학생들을 대상으로 신뢰도와 타당도를 확인해 한국어판 다차원적 심리적 유연성 척도(K-MPFI)를 개발하는 것이다. 영문으로 작성된 MPFI 질문들을 임상심리학 박사와 정신건강 전문의, 그리고 영어와 한국어에 능통한 연구자가 포함된 연구진에서 1차 번역을 실시하고 심리학을 전공하고 영어와 한국어 모두 능통한 외부 연구자가 원문을 참고하지 않고 영어로 역번역을 실시했다. 최종적으로 저자들의 논의를 고쳐 한국어판 MPFI(K-MPFI)문항 내용을 완성하였다. 신뢰도와 타당도 검증을 위해 대학생 총 458명을 표집하였다. 한국어로 번안된 K-MPFI 척도와 수렴타당도(한국판 수용-행동 질문지 제 2판, 인지적 유연성 척도) 및 동시타당도(우울증 선별도구, 범불안장애 선별도구, 한국판 정신적 웰빙 척도-단축형)를 측정하기 위한 설문을 실시하였다. 확인적 요인분석 결과, 원판 MPFI와 마찬가지로 2개의 상위 요인(전반적 심리적 유연성, 전반적 심리적 경직성)과 12개의 하위 요인(수용, 현재 자각, 맥락으로서의 자기, 탈융합, 가치, 전념행동, 경험적 회피, 지금 순간에 대한 접촉 부족, 내용으로서의 자기, 융합, 비활동성)이 도출되었다. K-MPFI의 전체 문항 및 하위 요인들은 높은 내적 신뢰도를 보였으며, 상관계수를 통해 확인한 수렴타당도와 동시타당도 또한 적합한 것으로 나타났다. 한편, 전반적 심리적 경직성의 하위 요인 중 하나인 경험적 회피의 경우 심리적 경직성의 다른 하위 요인들을 비롯해 타당도 검증을 위해 투입된 변인들과의 상관관계가 유의하지 않았다. 이러한 결과는 본 연구뿐만 아니라 기타 언어로의 타당화 연구에서도 유사하게 나타났다는 점은 의미가 있다. 경험적 회피의 개념에 대한 문화권의 차이를 비롯해 원판 MPFI의 경험적 회피 요인에 대한 문항 구성의 문제로 보여진다. 따라서 향후 추가적인 연구가 필요하다. 마지막으로, 본 연구의 제한점과 의의에 대해서 논하였다. The purpose of this study was to translate and validate the Multidimensional Psychological Flexibility Inventory (MPFI) into Korean, and develop a Korean version of the MPFI (K-MPFI) for use with university students. A team of this study, including a clinical psychology PhD, a mental health specialist, and researchers proficient in both English and Korean, conducted an initial translation of the English MPFI items. An external researcher who was proficient in both English and Korean and had expertise in psychology, conducted a back-translation of the Korean MPFI items into English without reference to the original version. The authors then discussed and finalized the content of the K-MPFI items. A total of 458 university students were recruited to assess the reliability and validity of the K-MPFI. A survey was administered that included the K-MPFI scale, as well as measures of convergent validity (Korean Acceptance and Action Questionnaire II, Cognitive Flexibility Scale) and concurrent validity (PHQ-9, GAD-7, Korean-Mental Helath Continuum- Short-form). Confirmatory factor analysis revealed that, like the original MPFI, the K-MPFI consisted of two higher-order factors (Global psychological flexibility and inflexibility) and 12 lower-order processes (acceptance, present moment awareness, self-as-context, defusion, values, committed action, experiential avoidance, lack of contact with the present moment, self-as-content, fusion, and inactivity). The K-MPFI and its lower-order factors showed high internal consistency, and the measures of convergent and concurrent validity were also appropriate. However, one of the lower-order processes of psychological inflexibility, experiential avoidance, did not show significant correlations with the other lower-order processes or with the validation measures, which may be due to cultural differences in the concept of experiential avoidance or issues with the item construction of the experiential avoidance factor in the original MPFI. Further research is needed to address these issues. Finally, the limitations and implications of the study were discussed.

샘플링 범위 제한을 이용한 원 및 구 장애물 환경에서의 RRT<SUP>*</SUP> 계열 알고리즘 성능 개량

이상일(Sangil Lee),박종호(Jongho Park),임재성(Jaesung Lim) 한국항공우주학회 2022 韓國航空宇宙學會誌 Vol.50 No.12

걱정의 병리적 진행과정에서 인지적 회피의 매개 특성

이상일(Lee, Sangil) 한국재활심리학회 2020 재활심리연구 Vol.27 No.4

본 연구의 목적은 범불안장애 인지 모델을 기반으로 걱정의 병리적 진행과정에 개입되는 인지적 회피의 매개효과 특성을 살펴보는 것이다. 구체적으로 각 진행 단계별로 인지적 회피 및 각 하위 요인(사고억제, 사고치환, 주의분산, 위험자극회피, 심상을 사고로 전환)의 매개효과분석을 실시하고 상대적인 매개효과 크기를 비교하였다. 총 1,733명의 대학생에게 불확실성에 대한 인내력 부족, 걱정, 상위걱정, 인지적 회피 척도를 활용하여 설문조사를 실시하였다. 결과는 다음과 같다. 불확실성에 대한 인내력 부족과 걱정, 걱정과 상위걱정이라는 두 진행과정에서 투입한 모든 매개변인들이 통계적으로 유의한 부분매개효과가 나타냈다. 그렇지만 하위 유형들의 상대적 매개효과 크기는 달랐다. 불확실성에 대한 인내력 부족과 걱정 간의 관계에서는 사고억제가 가장 큰 매개효과크기를 나타냈다. 반면에 걱정과 상위걱정 간의 관계에서는 사고억제가 가장 작은 매개효과크기를 나타냈으며, 심상을 사고로 전환이 가장 큰 매개효과 크기를 나타냈다. 이러한 결과는 걱정증상에 대한 효과적인 치료적 개입을 위해서는 걱정의 병리적 진행과정에 따라 차별적으로 나타나는 인지적 회피의 매개 특성에 대한 고려가 필요함을 시사한다. The purpose of this study is to examine the characteristics of the mediating effect of cognitive avoidance involved in the pathological process of worry based on the cognitive model for generalized anxiety disorder. Specifically, a mediating effect analysis of cognitive avoidance and sub-factors (thought suppression, thought substitution, distraction, avoidance of threatening stimuli, conversion into thought) was conducted at each stage of progress, and the relative mediating effect size was compared. A total of 1,733 university students were surveyed on the intolerance of uncertainty, worry, meta-worry, and cognitive avoidance. The results are as follows: All mediators showed statistically significant partial mediation effects in the two relations(intolerance of uncertainty and worry, worry and meta-worry). However, the relative mediating effect size of the subtypes was different. In the relation between the intolerance of uncertainty and worry, thought suppression represented the largest mediation effect. On the other hand, the relation between worry and meta-worry showed that thought suppression was the smallest, and transformation of images into thoughts was the largest. These results suggest that for effective intervention for worry symptoms, it is necessary to consider the mediating characteristics of cognitive avoidance that appear differently according to the pathological progression of anxiety.

프로세스 마이닝을 이용한 PDM/PLM 시스템 활용 프로세스의 효율성 개선

이상일(Sangil Lee),류광열(Kwangyeol Ryu),송민석(Minseok Song) (사)한국CDE학회 2012 한국CDE학회 논문집 Vol.17 No.4

Process mining is a useful methodology that can be used for extracting user patterns in log files in order to discover efficient or inefficient processes in organizations. In general, it is used to find and reduce differences between pre-defined processes and actually executed processes in an organization. In this paper, we propose a method to improve processes in PDM/PLM systems based on process mining. In order to improve and detect the inefficient processes, we gathered event logs from PDM/PLM systems and derived process models using several process mining techniques such as α-algorithm mining, heuristics mining, and fuzzy miner. By comparing original process models with process mining results, it is possible to detect differences between predefined processes and real ones; thereby we can build improved process models for future application.

트리즈를 이용한 흡기시스템 개발

이상일(Sangil Lee),김정민(Jungmin Kim),피광현(Kwanghyun Pieh) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11

New requirements of automotive have given the focus on the development of new intake system. Reduced space under the hood, NCAP, longer service life intervals, improved fuel-efficiency, cost reduction, lower noise and higher power require new high performance intake system. In order to achieve these requirements, a new conceptual development of intake system is necessary. TRIZ provides an appropriate problem solving approach. Unlike Conventional Trial & Error Method, TRIZ follows some rule to the ideal solution. It reduces the time for generating concepts. In other words, TRIZ is more systematical and promising innovation method like scientific law or mathematics. In this paper, the problem modeling methods, generating ideas, strategies, evaluation and verification about new intake system development of TRIZ area will be discussed.

"말하다" 동사의 분사형의 한국어 번역에 대하여

이상일(Lee, Sangil) 한국복음주의신약학회 2010 신약연구 Vol.9 No.3

When participles of SAYING verbs (e.g. λέγων) are translated, scholars have frequently faced interpretative difficulty because their semantic domains are overlapped with those of main verbs in a sentence. The participles of SAYING verbs often occur with hyponyms (e.g. ἀποκρίνομαι) or the very same saying verb(i.e. λέγω): ἀποκριθήσονται αὐτῷ οἱ δίκαιοι λέγοντες or οἱ δὲ εἶπαν αὐτῷ λέγοντες. In relation to the semantic or lexical overlap, many scholars have considered the participles of SAYING verbs as contact-induced syntactic change due to language contact because Semitic language has the same linguistic usage. So this is called Semitisms, Septuagintalisms, Semitic coloring, or Semitic interference among biblical scholars. However, it seems that the syntactic change of the participle of SAYING verbs does not result from language contact. There are two reasons. The same syntactic changes are also shown in non-Christian literature in Greek: Sophocles, Herodotus, Aristophanes, Demosthenes, Plato, or Thucydides. It is hard to imagine that Herodotus or Plato was influenced by Semitic language. This indicates that the syntactic change of the participles of SAYING verbs was not due to language contact but due to internal change. Furthermore, the same syntactic change also occurs in other languages: Ancient Akkadian, Kambera, Buru, Tukang, Besi, Ewe, Nama, Twi, Kusasi, Cahuilla, Saramaccan, Sranan, West African PE, Thai, Khmer, Vai, and Lezgian. These languages are not related to Hellenistic Greek politically, periodically, culturally, or geographically. This also shows that the syntactic changes do not come from language contact but from internal change of Greek language. Cognitive linguistic scholars have reached a consensus that this syntactic change is called grammaticalization. That is, the SAYING verb has lost its lexical meaning but gained a grammatical function. From the perspective of grammaticalization theory, participles of the SAYING verbs with main verbs can be translated into Korean in three ways. (1) The lexical meaning of the participles of the SAYING verbs is not overlapped with those of main verbs. The SAYING verbs can be translated literally. (2) The lexical meaning of the participles of the SAYING verbs is overlapped with those of main verbs. In other words, the SAYING participles are hypernyms of main verbs. The SAYING verbs should not be translated in a literal way because the SAYING verbs have lost their lexical meaning and, instead, gained grammatical feature (i.e. RECITATIVUM). (3) The lexical meaning of the participles of the SAYING verbs is same with those of main verbs. This is called tautology. The SAYING verbs should not be translated into Korean in a literal way. This also functions as grammatical feature without lexical meaning like (2). Accordingly, the participles of SAYING verbs which are semantic or lexical overlap with the meanings of main verbs should be considered as grammaticalized words due to internal syntactic change not Semitisms or Septuagintalisms due to language contact. In these cases, the SAYING verbs should not be translated in a literal way. The SAYING verbs function as complements(i.e. that).

박스 알고리즘을 활용한 새로운 암호화 방법

이상일(Sangil Lee),민승식(Seungsik Min) 한국정보기술학회 2017 한국정보기술학회논문지 Vol.15 No.11

Due to the invigorating of online activities, the number of the exposures of personal information is increasing each year, and the encryption technology is required to be improved every day. Interest in cryptography for the private field started in the 1970s, and DES, AES, and other cryptographic standards were developed. Although the complexity of these algorithms was considered to be very high, it turned out to be surprisingly easy to crack in the case of DES. Moreover, the safety of AES or SEED cannot be sustained. In this paper, we proposed a box algorithm as a Korean cryptographic algorithm and analyzed key length, complexity, and CPU time of the suggested algorithm. The box algorithm has a disadvantage in that the complexity is slightly smaller compared to the key length and the length of the ciphertext increases compared to the original text. Compared to other algorithms, however, it is easy to control the length of a key, which can increase the complexity to the desired level, and the ciphertexts are not unique. We analyzed the efficiency of the algorithm based on the key length, complexity, and CPU time and found an optimized value for the special cases.

국립공원 치유캠프가 아토피피부염 환자에 미치는 영향

이상일(Sangil Lee),안강모(Kangmo Ahn),이광신(Kwangshin Lee),권헌교(Heongyo Kwon),조혜진(Hyejin Cho),김종희(Jonghee Kim) 한국산림휴양학회 2010 한국산림휴양학회지 Vol.14 No.2

최근 숲의 치유기능에 대해 임학과 의학 분야에서 큰 관심을 보이고 있다. 본 연구는 국립공원 치유 캠프가 아토피피부염 환자들의 증상완화에 미치는 영향을 평가하고자 수행되었다. 치유 캠프의 효과는 의사 진단에 의한 환자의 중증도와 환자 본인의 가려움 정도를 캠프 전·후 평가하여 검증하였다. 연구결과, 국립공원 치유캠프는 아토피피 부염 환자들의 증상 호전 및 심리적 안정에 효과적인 것으로 나타났다. The therapeutic effect of forest settings is an emerging issue in the field of forestry and medicine. The purpose of this study was to evaluate the therapeutic efficacy of the national park healing camp for patients with atopic dermatitis (AD). Using pre-test and post-test group design with objective and subjective SCORAD score, mean changes in patient with atopic dermatitis by completion of the healing camp was measured. The result of this study indicated that the national park healing camp showed that has potential as an improved health status and psychological relaxation for patients with AD.

FPGA 역공학 도구들의 실험적 검증 및 분석

이상일(Sangil Lee),이한솔(Hansol Lee),유호영(Hoyoung Yu),김영민(Youngmin Kim),이형민(Hyung-Min Lee) 대한전자공학회 2018 대한전자공학회 학술대회 Vol.2018 No.11

In this paper, we analyze the reverse engineering tools for FPGA devices and experimentally verify their performance and limitations. The paper introduces the design flow for Xilinx FPGAs with emphasis on Xilinx Design Language (XDL), XDL Report (XDLRC), and bitstream. Then, existing reverse engineering tools, which utilize the bitstream to recover the netlist, are analyzed with quantitative comparison of measured recovery rates.