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Teacher Noticing for Supporting Student Proving: Gradual Articulation
김한길 대한수학교육학회 2022 수학교육학연구 Vol.32 No.1
Proof has been paid much attention in school mathematics and the literature. To date, the extant literature has focused more on difficulties in teaching and learning of proof rather than support that can help teachers to teach proof and develop student’s understanding about proof. This study examined a teacher’s practice that offers an explicit instruction of proof as part of everyday lesson. The results showed that the teacher supports student proving by way of teacher noticing with a clear definition of proof in the literature and that teacher noticing instructional practice needs to be more attuned for teaching proof. In particular, the teacher’s moves for supporting student proving differ by what aspects of proof that the teacher pays attention to at a given time and by judgement on whether an argument qualifies as a valid proof. This instructional practice would provide a guidance and foundation for teachers to engage students in proving as part of everyday lesson.
Communicative Language Teaching and Second Language Acquisition : Are They Bedfellows?
김한길 한국사회언어학회 2022 사회언어학 Vol.30 No.2
The advent of CLT in the 1980s led to the CLT-SLA debate which continued unabated for the last forty years. This paper asks, Does the now dominant Communicative Language Teaching (CLT) promote Second Language Acquisition (SLA)? In addressing this question, the paper first reviews and explains the social academic history of CLT; different versions of CLT (strong, weak); how CLT operates; its relationship to SLA, such as perceptions of SLA that have contributed to the development of CLT pedagogy (communicative competence, input, output, interaction hypothesis); and techniques used in CLT. Next, it deliberates on the most controversial issues of the CLT-SLA debate, including language forms, corrective feedback, teachers' perceptions of and approaches to CLT, and classroom conditions, followed by a discussion of the ease/difficulty of implementing CLT. It concludes with a discussion of how teachers can best practice CLT in their classrooms.
김한길,김수진,이환규,정회경,Kim, Han-Kil,Kim, Su-Jin,Lee, Hwan-Kyu,Jung, Hoe-Kyung 한국정보통신학회 2014 한국정보통신학회논문지 Vol.18 No.3
스마트폰 사용이 일반화되고 스마트워크, BYOD(Bring Your Own Device) 트렌드가 확산되면서 국내 무선랜 사용이 가속화되고 이로 인해 보안위협도 크게 증가하고 있다. 시스코시스템즈, 아루바네트웍스 등 무선랜 업체들은 WIPS(침입탐지), MDM(모바일단말관리), DLP 등 다양한 제품들을 출시해오고 있지만 비용이나 관리적인 측면에서 소규모 기업에서는 도입하기가 쉽지 않다. 본 논문에서는 고가의 H/W 장비를 도입하지 않고 무선랜 환경에서 패킷분석, AP, Station관리, 보안취약점을 분석할 수 있는 무선랜 침입탐지 시스템을 제안하고자 한다. Smartphones have become commonplace to use smart, BYOD (Bring Your Own Device) spread the trend of domestic WLAN use is intensifying as a result, the security threat will be greatly increased. Even though WLAN vendors such as Cisco Systems Inc,. Aruba networks released WIPS, MDM, DLP etc, however, these solutions can not be easily introduced for small business due to high cost or administrative reasons. In this paper, without the introduction of expensive H/W equipment, in WLAN environments, packet analysis, AP, Station management, security vulnerabilities can be analyzed by the proposed intrusion detection system.
Toxocara canis Mimicking a Metastatic Omental Mass from Sigmoid Colon Cancer: A Case Report
김한길,양정욱,홍순찬,이영준,주영태,정치영,이진권,곽승진 대한대장항문학회 2018 Annals of Coloproctolgy Vol.34 No.3
Toxocara canis is an important roundworm of canids and a fearsome animal parasite of humans. Human infections can lead to syndromes called visceral larva migrans (VLM), ocular larva migrans, neurotoxocariasis, and covert toxocariasis. VLM is most commonly diagnosed in children younger than 8 years of age, but adult cases are relatively frequent among those infected by ingesting the raw tissue of paratenic hosts in East Asia. This research reports the case of a 59-year-old man with sigmoid colon cancer, who visited our institution for surgery. An intraperitoneal mass was found on preoperative computed tomography, and it was thought to be a metastatic mass from sigmoid colon cancer. A postoperative histologic examination and serum test showed eosinophilic granuloma due to toxocariasis. Diagnosis of VLM is often difficult and highly suspicious in adults. Researchers suggest, although rarely, that VLM be included in the differential diagnosis as a cause of intraperitoneal tumors.