역부하 운용구간을 갖는 유압구동회로 설계

정재욱 한국기계기술학회 2015 한국기계기술학회지 Vol.17 No.2

In this paper, the design of hydraulic actuating circuit of doing over-running load was performed. Generally, the counter balance valve has been used to protect over-run or free falling of acuating system. But sometimes, it makes some undesirable problems such as pressure surge or vibration. To overcome such problems and satisfy the system requirements, we suggest the hydraulic circuit actuated by servo valve. In order to verify the properness of suggested hydraulic circuit, hydraulic actuator with servo valve was modeled using ADAMS/Hydraulic which is a commercial dynamic analysis software for multi-body system. Also, the effectiveness of hydraulic actuating circuit was verified via test bed and real plant.

地方自治團體의 世界化過程에 대한 分析模型과 그 評價 : 慶尙南道의 行政事例를 中心으로 focused on Kyeong-nam's Regional Policy

정재욱 중앙대학교 국가정책연구소 2003 국가정책연구 Vol.17 No.2

본 논문은 한국 지방자치단체가 세계화라는 시대적 흐름에 즈음하여 그들이 보여주고 있는 접근과정을 이론적으로 유형화하고 이를 기반으로 지방자치단체의 특성을 분석하여 보고자 한다. 지금까지 한국지방자치단체의 세계화과정에 대한 많은 연구물들이 있었지만 이들의 상당 부분이 개인적 주장에 기초한 정책대안의 모색으로 나타남으로써 지방자치단체의 세계화에 대한 이론적 접근과 과학적 분석을 도모하는 데는 한계점이 있었다. 이와 같은 입장에서 본 글에서는 한국 지방자치단체의 세계화와 관련된 각종 정책프로그램들을 보다 체계적으로 이해하고 이에 따른 효과적인 대응기제를 마련하는 데 기여하는 차원에서 지방자치단체의 세계화에 대한 접근과정을 모형화 하고 이를 바탕으로 각급 지방자치단체의 세계화에 따른 특징을 살펴보았다. 이를 위하여 본 글에서는 거시적 관점에서 각급 지방자치단체의 세계화과정에 따른 특징과 진행방향 및 추동요인을 기준으로 한국지방자치단체의 세계화의 과정에 대한 '비교분석모형'을 설정하였다. 이때 제시된 관련 요인으로는 '세계화와 관련된 지역사회제도에 대한 주민참여의 제도화', '기술'·자본·정보 등의 지역사회에 대한 진입 수준', 및 '단체장의 리더십'으로 하였다. 본 글은 한국 지방자치단체의 세계화에 대한 접근과정을 거시적 차원에서 탐색하고 있다. Now, it is globalization that is the most important policy issue confronted with the local governments, Especially, as the local governments of Korea are surrounded by such phenomena and are required strongly to become globalization, they are eager to get how to do such station effectively and speedily. Owing to such reason, this article is to explain globalizational process and its characteristics through which can be extracted from Kyeong-nam's experience during 1993- 1999. To study on such purpose, this article is to build the theoretical model and to explain globalizational process and its characteristics through this model. And now, this model is composed with two terms which are the level of political participation-institution and the degree of entrance of information-capital in community. So, this model includes four dimensions which are named a s the initial, the wide entrance, capital oriented development and the maturity shape. This article explains that Kyeong-nam is moving from the initial shape to the wide entrance shape on globalizational process. But, the social elite group strongly want to shift to the capital oriented shape.

가치 및 원칙에 대한 간접적 비판이 적극적 조치에 대한 태도변화에 미치는 영향

정재욱,김혜숙 한국사회및성격심리학회 2017 한국심리학회지 사회 및 성격 Vol.31 No.4

The present study examined how to persuade college students to support for the affirmative action policy for women. We hypothesized that since the persuasion attempts directly arguing against the recipients’ existing attitudes often had been confronted with resistance, indirect methods to attack the values or principles on which attitudes were based might be more effective. In Study 1, we presented the participants with either a message criticizing the meritocracy value(or principle) or insisting directly for the affirmative action policy. The participants indicated their attitudes towards AA both before and after reading the message. The results showed that the participants’ attitudes toward the AA policy tended to change more positively after reading the message criticizing the meritocracy value, in comparison with the participants who read the message arguing for the AA policy directly. The results also demonstrated that the positive effect of the attack on the value of meritocracy on attitude change was mediated by the increased favorability of the meritocracy value. In Study 2, we directly manipulated the favorability of the meritocracy value by providing positive or neutral evaluative information of the ingroup (i.e., the opinion of the same University students’ as the participant’s) regarding the meritocracy value or principle. The results demonstrated that as expected, positive ingroup norm compared to the neutral one changed the participant’s attitudes towards the AA policy more positively. The theoretical and practical implications of these findings were discussed. 본 연구는 대학생들을 대상으로 여성관련 적극적조치 정책에 대한 태도를 찬성하는 쪽으로 설득하기 위한 방법을 검토하였다. 보다 구체적으로, 수용자의 저항과 마주해야 하는 직접 설득의 시도에 비해, 저변의 가치를 간접적으로 공략하는 방법이 더 효과적일 수 있다는 가설을 검증하고자 하였다. 이를 위해 연구 1에서 실험참여자들은 조건에 따라 ‘여성에 대한 적극적 조치를 찬성하는 내용의 기술문’을 읽거나 혹은 ‘능력주의 원칙을 비판하는 내용의 기술문’을 읽고, 조작 전, 후로 적극적 조치 정책에 대한 태도를 묻는 질문에 응답하였다. 연구 1의 결과에서 적극적 조치 제도를 직접 지지하는 기술문을 본 참여자들보다 능력주의 원칙을 비판하는 기술문을 본 참여자들에서 적극적 조치정책관련 태도가 더 긍정적으로 변하였다. 또한 능력주의 비판의 설득효과는 능력주의 원칙에 대한 호감 감소에 의해 매개되었다. 연구 2에서는 내집단 규범정보를 제공함으로써 능력주의 원칙에 대한 호감을 조작하여 정책태도 설득효과를 반복 검토하였다. 실험참여자들은 조건에 따라 ‘능력주의 원칙을 비판하는 내용의 기술문’에 대한 대학생 집단의 평가정보가 긍정적이거나 혹은 중립적인 조사결과를 접하였다. 분석 결과, 능력주의 비판 기술문에 대한 대학생들의 평가가 긍정적이었을 때 중립적이었을 때보다 참여자들의 적극적 조치정책 관련 태도가 더 긍정적으로 변하였다. 본 연구는 적극적조치 정책에 대한 태도를 긍정적으로 변화시키기 위해서 태도를 집적 공략하기보다 반대 태도의 기반이 되는 가치 및 원칙을 공략하는 간접적 방법이 더 효과적일수 있음을 보였다. 본 연구는 평등실현을 위한 적극적조치 제도에 대한 태도를 찬성으로 변화시키기 위한 개입을 다룬 연구라는 점에서 그 실질적 의미가 있다.

한국의 최빈개도국 대상 특혜관세제도의 교역효과 분석

정재욱 한국무역통상학회 2022 무역통상학회지 Vol.22 No.6

We empirically analyze the trade effect of the preferential trade arrangement (PTA) of Korea for least developed countries(LDCs). In 2000, Korea launched PTA that allows duty-free and quota-free market (DFQF) access to LDCs. Korea has granted DFQF access to LDCs and extended preferences for LDCs since 2012. However, imports from LDCs account for less than 1% of Korea’s total imports. We incorporate Silva and Tenreyro(2006)’s PPML method in the traditional gravity model for unilateral preferential schemes as in Gil-Pareja, et al.(2014) to address “zeros” in trade data and the endogeneity issues between trade and trade agreements. An empirical study of Korean 2000-2020 disaggregated import data shows that DFQF failed to increase LDCs’ exports. Korea needs to reform DFQF and design mutually beneficial trade agreements for LDCs.

염산티트라싸이클린의 적용시간에 따른 다공성 임프란트 표면 미세구조의 변화

정재욱,허익,권영혁,박준봉,정종혁,Jeong, Jae-Wook,Herr, Yeek,Kwon, Young-Hyuk,Park, Joon-Bong,Chung, Jong-Hyuk 대한치주과학회 2006 Journal of Periodontal & Implant Science Vol.36 No.2

Mechanical and chemical methods are the two ways to treat the implant surfaces. By using mechanical method, it is difficult to eliminate bacteria and by-products from the rough implant surface and it can also cause the structural change to the implant surface. Therefore, chemical method is widely used in order to preserve and detoxicate the implant surface more effectively. The purpose of this study is to evaluate the effect of tetracylcline-hydrochloride(TC-HCI) on the change of implant surface microstructure according to application time. Implants with pure titanium machined surface, SLA surface and porous surface were used in this study. Implant surface was rubbed with sponge soaked in 50mg/ml TC-HCI solution for $\frac{1}{2}$ min., 1 min., $1\frac{1}{2}$ min., 2 min., and $2\frac{1}{2}$ min. respectively in the test group and with no treatment in the control group. Then, specimens were processed for scanning electron microscopic observation. 1. Both test and control group showed a few shallow grooves and ridges in pure titanium machined surface implants. There were not significant differences between two groups. 2. In the SLA surfaces, the control specimen showed that the macro roughness was achieved by large-grit sandblasting. Subsequently, the acid-etching process created the micro roughness, which thus was superimposed on the macro roughness. Irrespective of the application time of 50mg/ml TC-HCI solution, in general, test specimens were similar to control. 3. In the porous surfaces, the control specimen showed spherical particles of titanium alloy and its surface have a few shallow ridges. The roughness of surfaces conditioned with tetracycline-HCI was lessened and seen crater-like irregular surfaces relative to the application time. In conclusion, pure titanium machined surfaces and SLA surfaces weren't changed irrespective of the application time of tetracycline-HCI solution. But the porous surfaces conditioned with tetracycline-HCI solution began to be slightly changed from 2 min. This results are expected to be applied to the regenerative procedures for peri-implantitis treatment.

리스크 분석에 따른 오피스 투자적정성 분석 - DPL Modeling 기법을 바탕으로 ( An Analysis of Investment propriety in Office building with Risk Management & DPL modeling )

정재욱,백준홍 대한건축학회 2002 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.22 No.1

Oncologic Outcomes of Extended Lymphadenectomy without Liver Resection for T1/T2 Gallbladder Cancer

정재욱,이우정 연세대학교의과대학 2019 Yonsei medical journal Vol.60 No.12

Purpose: This study provides a standardized operative strategical algorithm that can be applied to patients with T1/T2 gallbladdercancer (GBC). Our aim was to determine the oncologic outcome of radical cholecystectomy with para-aortic lymph node dissectionwithout liver resection in T1/T2 GBC. Materials and Methods: From January 2005 to December 2017, 164 patients with GBC underwent operations by a single surgeonat Severance Hospital. A retrospective review was performed for 113 of these patients, who were pathologically determined to be instages T1 and T2 according to American Joint Committee on Cancer 7th guidelines. Results: Of the 113 patients, 109 underwent curative resection for T1/T2 GBC; four patients who underwent palliative operationswithout radical cholecystectomies were excluded from further analyses. For all T1b and T2 lesions, radical cholecystectomy withpara-aortic lymph node dissection was performed without liver resection. There were four GBC-related mortalities, and 5-yeardisease-specific survival was 97.0%. The median follow-up was 50 months (range: 5–145 months). In all T stages, the median wasnot reached for survival analysis. Five-year disease-specific survival for T1a, T1b, and T2 were 100%, 94.1%, and 97.1%, respectively. Five-year disease-free survival for T1a, T1b, and T2 were 100%, 87.0%, and 91.8%, respectively. Conclusion: Our results suggest that the current operative protocol can be applied to minimal invasive operations for GBC withsimilar oncologic outcomes as open approach. For T1/T2 GBC, radical cholecystectomy, including para-aortic lymph node dissection,can be performed safely with favorable oncologic outcomes.

日本의 地方分權改革의 方向成과 그 敎訓 : 1990년대 이후의 지방자치제도의 개혁을 중심으로

정재욱 중앙대학교 국가정책연구소 중앙행정학연구회 2001 국가정책연구 Vol.15 No.1

일본은 1990년대 이후 약 10년간에 걸쳐서 중앙정부권한과 기구의 축소를 축소함과 동시에 지방자치단체의 권한과 기능을 강화시키는 지방분권개혁을 강력히 추진하여 왔다. 이와같은 노력의 일환으로 나타난 것이 1999년 7월 16일 공포되고 2000년 4월 1일자로 시행되는 地方 分權推進一括法이다. 금번의 지방분권개혁이 지닌 이미지는 일본인 스스로가 표현하듯이 제 3의 유신이라 할 정도로 기존의 일본정부 행정구조를 바꾸어 놓고 있다. 여기에 담겨진 중 요한 내용은 ㉠국가와 지방자치단체간의 역할분담의 명확·법정화 ㉡기관위임사무제도의 폐 지와 사무재 구분 ㉢지방사무관제도의 폐지 ㉣중앙정부의 관여법정주의 ㉤권한위임의 강화 필치규제의 개선 ㉦지방자치단체의 수수료규정개정 ㉧지방자치단체의 자치행정체제개선 등 으로 나타나고 있다. 이에 비하여 한국은 최근에 들어서서 부단체장의 국가직이나 자치구청 장의 임명제로의 전환 등으로 대변되는 지방분권의 경색화가 크게 부각되고 있다. 이와같은 입장에서 최근에 단행된 일본의 지방분권개혁의 이념과 방향은 우리에게 많은 시사점을 줄 것으로 본다.

중풍환자의 변비에 대한 소풍순기원의 효능에 관한 고찰

정재욱,서상호,이은형,김종득,홍수현,김원일,Jeong, Jae-Ook,Seo, Sang-Ho,Lee, Eun-Hyung,Kim, Jong-Deuk,Hong, Soo-Hyun,Kim, Won-Il 대한한방내과학회 2005 大韓韓方內科學會誌 Vol.26 No.4

Object : This study aims to assess the efficacy of Sopungsoongiwon(疏風順氣元) in constipated stroke patients and to find out the hepatotoxicity and nephrotoxicity of Sopungsoongiwon. Methods : Subjects were 111 patients who were admitted to tile hospital. The informations about the constipation and other factors were taken through medical records as follows : time until defecation, amount of Sopungsoongiwon until defecation, amount of stool, AST, ALT, BUN, Creatinine. We get the means and standard deviation from the various factors obtained from medical records. Results : 1. The mean time until defecation after taking Sopungsoongiwon was $20.919{\pm}17.885$ hours. 2. The dose of Sopungsoongiwon until defecation was $3.126{\pm}1.624$ packs. 3. The mean amount of stool was $135.360{\pm}63.288g$. 4. AST, ALT, BUN, Creatinine was maintained in normal range after taking sopungsoongiwon(p<0.0001).

Targeting the Hippo Effector YAP overcomes the resistance to EGFR-TKI of both EGFR mutated and Kras mutated lung adenocarcinoma

정재욱,이다혜,김선영,김주옥,정성수,박희선,이정은,문재영,박동일,이재철,임대식 대한결핵 및 호흡기학회 2015 대한결핵 및 호흡기학회 추계학술대회 초록집 Vol.120 No.-

Purpose: EGFR-TKI is very effective drug for lung adenocarcinoma harboring sensitive EGFR mutation. But most patients become resistant to EGFR-TKI by many mechanisms. Adenocarcinoma with Kras mutation is innately resistant to EGFR-TKI. Overcoming these resistances is one of the most critical problems in lung cancer treatment. Hippo pathway and its effector YAP are involved in lung development and tumorigenesis. Experimental design: PC9 cell line with EGFR mutation and A549 cell line with K-ras mutation were used. Their gefitinib resistant (GR) cell lines, A549/GR and PC9/GR were used. Expression of YAP was examined in A549, A549/GR, PC9 and PC9/GR. Results: YAP and its downstream including AXL were significantly increased in GR cell lines. YAP over-expression makes PC9 and A549 cell more resistant to EGFR-TKI. Combination of EGFR-TKI and inhibition of YAP by siRNA or Verteporin significantly overcomes the resistance to EGFR TKI in both PC9/GR and A549/GR. Conclusion: YAP is deeply involved in developing EGFR-TKI resistance in EGFR mutant cell, PC9 and also Kras mutant cell, A549. Targeting Hippo effector YAP with EGFR-TKI may be novel strategy for overcoming the EGFR-TKI resistance in adenocarcinoma.