[V. 회원 칼럼] 정승환 ISG 프로젝트 칼럼

정승환 한국코칭능력개발원 2022 Coach Vol.27 No.2

형사소추기관의 구조개혁과 수사기관의 일원화

정승환 한국형사정책학회 2012 刑事政策 Vol.24 No.2

We have debated on the prosecutorial organs, the prosecution and the police, for a long time, but the matter still remains unsolved. In this thesis, I indicate the problems with the prosecution and the police. The former has an absolute power on the public action, having a lot of direct-investigation manpower autonomously, maintaining control of the police in the investigation. The latter is under control of the police administration order-system, which is as powerful as the prosecution. Thus there is a problem that the police assert independent investigation without an identity and professionalism. Above all, the current prosecutorial structure, which means two organs take charge of investigation doubly, is the main subject of this study. We must perceive that the current structure is causing the conflict between two organs, the inefficiency and unfairness of criminal prosecution. Because they investigate same affair separately without dividing according to jurisdiction. To reform this, at first, we must divide the prosecution's two functions, the investigation and the public action. And unify the prosecutorial structure by putting the investigation prosecutor and the judicial police to investigate together in the newly-organized authority for investigation. Then, assign a different function to each organ, the public action to the prosecution and the public peace to the police.

A comparison study on Korea and Australia regarding the social network analysis of the customers' attitude, satisfaction, and revisit intention in the family restaurant : focusing on the difference in the SNS using experience

정승환,Eller, Charles,김재석 한국호텔관광학회 2016 호텔관광연구 Vol.18 No.6

This study tries to analyze the relationship between the social network of the customers' revisit intention, attitude and satisfaction in the family restaurant through differentiating the customers who have experiences of using SNS and who do not. The reason for this assumption is that many family restaurants are investing a lot into boosting their image and customer attraction by providing SNS services such as Facebook, Twitter, and Kakaotalk. To analyze this, breaking from the properties of effect relationship so far, the study will investigate the connection structure focusing on the properties between the relationships. This study conducted a survey in Korea and Australia for 20 days from September 1 and used a total of questionnaires for the analysis. The result of study shows that there was a difference in the customers' attitude, satisfaction, and revisit intention about family restaurants according to the experience of using SNS service information. The result of analyzing the network focusing on the connection centrality and proximity centrality also shows that there was a difference in the connection centrality and proximity centrality between the two groups.

유튜브 K-pop 콘텐츠의 재목적화 유형 연구

정승환,정민주,최믿음 사이버커뮤니케이션학회 2022 사이버 커뮤니케이션 학보 Vol.39 No.3

This research explores the transformation and distribution of K-pop contents on the YouTube platform, focusing on the role of domestic and international YouTube users as the prosumers of new contents created using original K-pop. By borrowing the concept of ‘media repurposing’ suggested by Bolter and Grussin, the purpose of this study was to analyze how K-pop contents that is repurposed(reused, reprocessed, and recreated) can be categorized in YouTube in terms of sound source and video. To this end, one of the qualitative research methods, the internet ethnography was used to categorize the types and methods of repurposed K-pop contents through an analytical coding. As a result, the repurposed K-pop contents was categorized of 31 methods within 7 categories(①Reusing of sound sources and videos, ②Reprocessing centered on sound sources, ③Recreating centered on sound sources, ④Reprocessing centered on the videos, ⑤Recreating centered on videos, ⑥Recreating of sound sources and videos, ⑦ Creating of sound sources and videos). These seven typologies of contents repurposing are described as a participatory culture in which users actively participate in the process of content interpretation, transformation, and distribution. This research is significant in that it enhances an exploratory comprehension of K-pop consumers’ creative behaviors on content transformation as observed on YouTube and examines their dynamism and diversity as a part of participatory culture. K-pop의 글로벌 확산과 인기는 유튜브에 유통되는 K-pop 콘텐츠를 변형, 가공하는 등 보다 적극적인 방식으로 K-pop을 소비하는 이용자들의 창의적 활동으로 인해 그 폭이 넓어지고 있다. 이 연구는 국내외 유튜브 이용자들이K-pop 콘텐츠 원본을 활용해 새로운 콘텐츠를 창작하는 생산소비자로 역할한다는 것에 주목하고, K-pop 콘텐츠가 유튜브 플랫폼에서 어떠한 양상으로 변형되어 유통되고 있는지 살펴보았다. 구체적으로 볼터(Bolter)와 그루신(Grusin) 의 미디어 재목적화(repurposing) 개념을 차용하여 유튜브 내에서 재목적화(재사용, 재생산, 재창조)되는 K-pop 콘텐츠를 유형화하고 각 유형의 대표적인방식을 탐구하였다. 이를 위해 질적 연구방법 중 하나인 인터넷 문화기술지를사용하여, 분석적 코딩방법을 통해 재목적화된 K-pop 콘텐츠의 유형과 방식을분류하였다. 분석결과, 재목적화된 K-pop 콘텐츠는 7개(①음원⋅영상 재사용, ②음원 중심 재가공, ③음원 중심 재창조, ④영상 중심 재가공, ⑤영상 중심재창조, ⑥음원⋅영상 재창조, ⑦음원⋅영상 창조) 유형의 31개 방식으로 구분되었다. 이 연구를 통해 글로벌 플랫폼 유튜브에서 관찰되는 K-pop 이용자의 창조적 콘텐츠 변형 행위에 대한 탐색적 이해를 도모하고, 참여 문화인으로서 K-pop을 소비하는 이용자의 역동성과 다양성에 대해 논의하였다.

지연 선로가 없는 Feedforward Loop를 이용한 선형화기의 설계 및 제작

정승환,조경준,김완종,안창엽,김종헌 한국전자파학회 2000 한국전자파학회논문지 Vol.11 No.1

This paper presents a linearizer using the feedforward loop which can be applied to PCS base-station applications. This linearizer used a IM amplifier and an auxiliary amplifier in order to remove delay lines used in the predistortor using the feedforward technique. The delay line in error loop is changed by the main power amplifier(PA) and the error amplifier is utilized to amplify the error signal which fed to the output of main amplifier. The linearizer was simulated by HP ADS ver 1.1 and fabricated on GML 1000 with thickness of 0.8 mm and dielectric constant of 3.2. Two-tone signals at 1.85 GHz and 1.851 GHz with -7dBm/tone from synthesizers are injected into the main PA. The main PA with a 27 dB gain and a $P_{1dB}$ of 29 dBm(two-tone) was utilized. The reduction of intermodulation distortion (IMD) is around 17 dB. 본 논문에서는 Delay line이 없는 Feedforward loop를 이용한 PCS 중계기용 선형화기룹 설계 및 제작하였다. 기존의 Feedforward 방식을 이용한 Predistortor에서 사용되는 지연 선로(Delay line)를 제거하기 위하여 기존의 선호 루프(Signal loop)의 주 경로에 보조 증폭기를 사용하고 보조 경로에 보조 증폭기와 비슷한 동작시간을 갖 는 혼 변조 증폭기(Inter-modulation am미ifier)를 사용하였다 또한, 주 증폭기를 에러 루프(Error loop)로 옮기 고 그와 비슷한 농작시간을 갖고 에러 선호를 증폭하기 위해서 에러 증폭기(Error amplifier)를 사용하여 지연 선로를 제거하였고 에러 선호를 주 증폭기 출력 단에 인가시켰다, 본 논문의 선형화기는 HP사의 EEsof ADS v ver.l.l을 사용해서 설계하였으며 유전율 3.2 .. 2 두께 0.8mm인 GML 1000 기판에 제작하였다. 측정 결과, 이득 27 d dB이고 $P_{1dB}$ 29 dBm인 주 전력 증폭기에 -7 dBm/tone을 갖는 1.85 GHz와 1.851 GHz의 2-tone 신호를 인가한 결과 전체 IMD가 약 17 dB 개선되었다.

A prospective, multicenter study on the clinical effectiveness of abiraterone in metastatic castration-resistant prostate cancer in Korea: Pre- vs. post-chemotherapy

정승환,연상은,김수연,권태균,전성수,최영득,권동득,정병하,홍성후,김병훈,이효진,신상준,최우석,박성우,강택원,윤석중,조진선,최세민,이나리,곽철 대한비뇨의학회 2023 Investigative and Clinical Urology Vol.64 No.5

Purpose: The proper treatment sequence for administering abiraterone acetate plus prednisolone (AAP) and chemotherapeutic agents has not yet been elucidated for metastatic castration-resistant prostate cancer (mCRPC). Hence, this study evaluated the effectiveness and safety of AAP in pre- and post-chemotherapy settings using real-world data. Materials and Methods: This prospective, multicenter, open-label, observational study included 506 patients with mCRPC. Patients were classified according to the timing of chemotherapy into pre- and post-chemotherapy groups. The effectiveness and safety of AAP were compared between the groups; the prostate-specific antigen (PSA) response, PSA progression-free survival, and radiologic progression-free survival were assessed; and adverse drug reactions were recorded. Results: Among the included patients, 319 and 187 belonged to the pre- and post-chemotherapy groups, respectively. Risk classification was similar between the two groups. The PSA response was 61.8% in the pre-chemotherapy group and 39.0% in the post-chemotherapy group (p<0.001). The median time to PSA progression (5.00 vs. 2.93 mo, p=0.001) and radiologic progression-free survival (11.84 vs. 9.17 mo, p=0.002) were significantly longer in the pre-chemotherapy group. Chemotherapy status was associated with PSA (hazard ratio [HR] 1.39, 95% confidence interval [CI] 1.09–1.77) and radiologic progression (HR 1.66, 95% CI 1.18–2.33) during AAP treatment. Adverse drug reactions were reported at similar frequencies in both groups. Conclusions: In this postmarketing surveillance, AAP benefited patients with mCRPC, especially in settings before chemotherapy was administered, resulting in a high PSA response and longer PSA and radiologic progression-free survival with tolerable adverse drug reactions.

질병: 장관질병 예방이 경쟁력이다(II)

정승환,Jeong, Seung-Hwan 한국육계협회 2011 월간 닭고기 Vol.17 No.5

효과적인 화물 적재 운영을 위한 직반송 요인 분석과 개선 방안에 대한 연구

정승환 한국경영공학회 2023 한국경영공학회지 Vol.28 No.2

Purpose The purpose of this paper is to investigate direct shipment factors and propose improvement strategies for efficient container loading operations. Methods This paper develops a statistical model to identify significant factors that degrade direct shipment and proposes a practical algorithm that mitigates such negative effects. Results The analysis identifies variability on the logistics flow as a significant factor, which increases the mismatching between packaging and loading operations and thus deteriorates direct loading. Our analysis also reveals that the proposed variability-mitigating algorithm can efficiently reduce such variability, resulting in a significant improvement on the direct shipment. Conclusion In consideration of the fact that there are many manufacturing companies subject to the same logistics issue, our analysis and proposed method can be applied in various industries and can make a significant economic impact.

Iodine-Induced Polymerization of 2-Ethynylpyridine

정승환,박종욱,심상연,진성호,임권택,제갈영순 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1

The design and synthesis of π-conjugated polymers with peculiar topologies are of interest in various application fields of chemistry. Especially, the ionic conjugated polymers with quaternary nitrogen atoms are of interest because they exhibit ionic conductivity in a material. The non-catalyst polymerization of ethynylpyridines using functional halides has been known to be very effective synthetic method for conjugated polyelectrolytes. Here, we report the synthesis of new conjugated polyelectrolytes by the iodine-induced polymerization of 2-ethynylpyridine. The cyclic voltammetry of polymer exhibited irreversible electrochemical behavior between the oxidation and reduction peaks. The optical absorption spectrum of polymer exhibited characteristic absorption peak in the lower energy regions(up to 800 nm. The PL emission spectrum of polymer shows two peaks at 515 and 550 nm.

키토산을 첨가한 의치상 재료의 세균 부착에 관한 연구

정승환,방몽숙,박하옥,Chung Sung-Hwan,Vang Mong-Sook,Park Ha-Ok 대한치과보철학회 2002 대한치과보철학회지 Vol.40 No.5

The purposes of this study were to evaluate the adherence of bacteria on various denture base resin materials and effects of chitosan, added to denture base materials on bacterial adherence. PMMA denture base resin such as heat-cured Vertex-RS, self-cured Vertex-SC and 4-META denture base resin such as heat-cured Meta-Dent, self-cured Meta-Fast were used in this study Samples were divided into two groups the denture base resin with chitosan, without chitosan Streptococcus mutans and Lactobacillus casei were used in this study. The surface of samples was observed by SEM. When chitosan was added to M17 and MRS broth, viable cell count of bacteria was reduced. Viable cell count of Streptococcus mutans on the samples decreased as follows : Meta-Dent, Vertex-SC, Meta-Fast, Vertex-RS. Viable cell count of Lactobacillus casei on the samples decreased as follows: Vertex-RS, Meta-Dent, Meta-Fast, Vertex-SC. The resin with chitosan showed lower adherence of bacteria than without chitosan. The images of SEM showed that the surface of the resin with chitosan was rougher than that of without chitosan. These results showed that the denture base resin materials with chitosan have rougher surface than without chitosan, but less bacteria adhered on them.